JPH01304974A - Image recording device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an image recording apparatus such as a printer or an electronic typewriter, and more particularly to an image recording apparatus having a drive switching mechanism for recording sheet conveying means.

[Prior art]

As an image recording device such as a printer or electronic typewriter, the recording head is mounted on a carriage that moves back and forth along a platen in the direction of the print digit, and the recording head is driven in synchronization with the movement of the carriage and based on the print data. An image consisting of a dot matrix is formed for recording sorting, and 1
When recording for a line is completed, the recording sheet is pinch-fed by one line, then the last line is recorded, and after one page has been recorded, the recording sheet is generally fed and ejected.

Further, in a thermal type recording apparatus, recording is performed while the thermal head is slid while being pressed against a sheet on a platen, and this type of apparatus uses an up-down mechanism for the thermal head.

Furthermore, in the case of the thermal transfer type, an ink ribbon cassette is replaceably mounted on the carriage, and during recording (head down) the ink ribbon is fed to the front of the recording/rad at a speed that corresponds to the carriage movement speed. It is configured like this.

Incidentally, in this type of image recording apparatus, one in which a single motor is used to raise and lower a thermal head and convey a recording sheet is known.

[Problem that the invention seeks to solve]

However, in the conventional image recording device of the above type, it is difficult to switch to the recording sheet m feeding function during printing, and the sheet feeding function can only be switched to when the thermal head is at the home position (for example, the leftmost position). However, the switching operation took a considerable amount of time.

An object of the present invention is to solve the above-mentioned problems of the prior art, to be able to switch to the sheet till feeding function at any position of the thermal head, and to improve the recording speed by quick switching even with a single motor. An object of the present invention is to provide an image recording device.

[Means for solving problems]

The present invention provides an image recording apparatus that records an image on a recording sheet, including: a recording head for recording an image on the recording sheet; a carriage that holds the recording head and moves back and forth along a platen; a tU transport means for transporting the recording sheet; a motor for driving the transport means and providing driving force for raising and lowering the recording head; a movable drive transmission switching means provided so as to be engageable and displaceable; and an engagement means for engaging the carriage and the drive switching means; The above object is achieved by an image recording apparatus configured to switch between driving the image feeding means and driving the recording head up and down.

Yarn below! ':ll 〔Example〕 Examples will be described below with reference to the drawings.

FIG. 24 is an external perspective view of a typewriter T, which is an example of an image recording apparatus in accordance with an embodiment of the present invention.

In FIG. 24, 210 is a platen, 212 is a recording sheet (recording medium such as paper or a thin plastic plate), 21
3 is an exterior, 214 is a power switch for controlling power on/off, and 215 is a keyboard.

A foot switch 216 is turned on and off by opening and closing the hood 213a, and senses the opening and closing of the hood 213a.

MOKY is a mode key, and is used to set various modes such as ribbon mode setting, which will be described later.

PRKY is a print command key.

Further, the typewriter T includes a printing section (recording section), an input section, a display section, a control section, an external input/output interface section, and the like.

Note that, of course, in this embodiment, the input section and the display section may not be provided.

FIG. 1 is a perspective view showing the main internal parts of an image recording apparatus to which the present invention is applied.

As described later, this image recording device (printer, typewriter, etc.) can be loaded with a so-called self-collection ink sheet cassette, an ink sheet cassette for two-color printing, and a normal ink sheet cassette for single-color printing. By making full use of the characteristics of the attached ink sheet, it is possible to perform monochrome recording, two-color recording, recording correction, etc.

In FIG. 1, reference numeral 1 denotes the base of the apparatus main body, which has a left side plate 101, a right side plate 102, a left side plate 103 for the gear receiver, a right side plate 104 for the gear receiver, and a plate 105 for mounting the head motor.

A shaft 101a for holding a PF reduction gear, which will be described later, is implanted in the left side plate 101. The gear receiver is on the left side plate 10
3 includes a shaft 103 for supporting an intermediate gear ■ to be described later.
A, a guide hole 103b for supporting a torque shaft and a torque shaft gear, which will be described later, and a guide hole 103c for holding a carriage shaft are provided.

The gear receiver right side plate 104 is provided with a guide hole 104a for supporting a torque shaft, which will be described later, a guide hole 104b for holding a carriage shaft, and a screw hole 104C for preventing the carriage and 7-ji shaft from coming out. It is being

The head motor is mounted on the plate 105 with a selection gear 2, which will be described later.
2, a shaft 105a for holding the selection gear spring 23, and screw holes 105b, 105c for mounting the head motor.
Hole 1 for the pinion 21 of the head motor 20 to protrude
05d is provided.

In addition, a flexible cable (
A slot portion 106a is provided for holding the FPC”).

Here, the flexible cable (FPC) is
It is used to transmit signals into the carriage 28, etc., or to remove charges.

This signal includes heat generation control of the thermal throat 78, drive control of the carriage motor 45, and O of the home sensor 49.
N/OFF detection, etc.

Further, in this embodiment, as described above, the FPC is used to remove the electric charge (grounding) from the ink ribbon.

Further, the bottom plate 107 of the base 1 is provided with a guide rail portion 107d on which the rollers 54 of the carriage slide, a floating portion 107a of the clutch rack 27, a boss 107b for detecting the left limiter, and the like.

Further, 107c is a rack, which is provided at a predetermined position on the base 1 along the printing digit direction (recording direction),
Carriage idle gear 64 of carriage 28 to be described later
are meshing together.

The paper pan 2 is formed integrally with the base 1, and has openings 2a at predetermined positions (six locations) in which pinch rollers 8, which will be described later, are accommodated.

Reference numeral 3 designates a paper feed roller (PF roller), in which a disc-shaped sheet guide portion 3a and a cross-shaped cross plate 3b alternate, and are integrally formed of a plastic material such as polycarbonate or ABS. Ru.

A release lever 16 (described later) is attached to the guide shaft 3C at one end of the paper feed roller 3, and a paper feed gear 12 (described later) is attached to the guide shaft 3d by a spring pin 4 at the other end. It is attached and rotatably supported by the left side plate 101 and right side plate 102.

Reference numeral 5 denotes paper feed rubber (PF rubber), which is provided at a predetermined position with a gap between it and the paper feed roller 3, and rubber is wrapped around its circumferential surface. In this embodiment, the paper feed rubbers 5 are provided at six locations.

Further, reference numeral 6 denotes a platen holder, which is held between the left side plate 101 and the right side plate 102, and has grooves 6a at positions facing the guide plate 3a of the paper feed roller 3 and the paper feed rubber 5, respectively. It is provided. In addition, a paper feed (PF) roller 3 is used to guide the leading edge of the recording sheet 212 being conveyed.
A convex bent portion 6b is formed at the lower part of the holder 6 facing the gap between the paper feed rubber rollers 5.

On the other hand, on the front surface of the platen holder 6, that is, at a position facing a recording head 78, which will be described later, there are printed characters along the digit direction.
A platen 7 made of CR rubber coated with a Teflon sheet is attached.

This platen 7 maintains the recording sheet 212 at a predetermined position during recording by the recording head 78.

A pinch roller 8 is in pressure contact with the paper feed rubber roller 5, and is lined with rubber so that the leading edge of the recording sheet 212 is easily pinched when the recording sheet 212 is inserted.

Reference numeral 9 denotes a cylindrical front roller, which is arranged so that the outer periphery of the front roller 9 comes into contact with the paper feed rubber 5 described above.

The front roller 9 is rotatably supported by a support arm 10, and is pressed by a pinch spring 11. The pinch spring 11 is formed of an integral leaf spring that also presses the center portion of the pinch roller 8.

Reference numeral 12 denotes a paper feed gear (PF gear), which is connected to the rotating shaft 3a of the paper feed roller (PF roller) 3 described above.
It is attached to and rotates as a unit.

Reference numeral 13 denotes an intermediate gear I, which is rotatably attached to the shaft portion 3a of the PF roller 3 concentrically.

14 is a retaining ring of the intermediate gear 113, which restricts the movement of the intermediate gear (2) in the thrust direction.

15 is a left knob for paper feed, and the PF
It is integrally attached to the roller 3. By manually operating this knob 15, the roller 3 can be rotated in either forward or reverse directions.

16 is a release lever, which is connected to the shaft portion 3C of the PF roller 3.
It is rotatably fitted to the right side plate 102 and is also rotatably attached to the right side plate 102.

Then, by operating the knob 16a, the paper release mechanism is operated, the pinch roller 8 and the front roller 9 are released from the PF roller (drive roller) 3, and the recording sheet 212 can be made free.

The longitudinal cross-sectional view of the image recording apparatus in FIG. It is shown.

In addition, the manual operation section of the paper release mechanism, that is, the knob 16a and the gear section 16 are shown on the right side of FIG.
a release lever 16 having b, and the gear portion 16
By rotating the release lever 16 in the direction of arrow A, the leaf spring 1 is released.
1 and a release shaft 12 that transmits a torque for releasing the support arm 10 against the elastic force of the leaf spring.
0 is shown.

Similar to the release lever 16, the shaft portion 3a of the PF roller 3
A barrier pull gear (not shown), a detent gear 17, a right sheet feed knob 18, etc. are attached (concentrically) to the seat.

The barrier pull gear (not shown) is fixed at 3a to the shaft portion of the PF roller 3 with a spring pin (not shown).

The detent gear 17 has a detent tooth pattern 17 on the outer periphery.
a, and is fixed to the PF roller 3 and rotates integrally with it.

On the base L side of the recording device, the date and gear 17 are installed.
A detent spring (not shown) that is elastically pressed against the tooth profile 17a is fixed with a screw (not shown), and this detent spring accurately determines the rotational position of the detent gear 17 and maintains the stable position of the PF roller 3. is producing.

Reference numeral 18 denotes a right sheet feed knob, which is integrally attached to the right end of the PF roller 3. The PF roller 3 can be rotated by manually operating this knob 18 or the left knob 15.

20 is a head motor, which is fixed to the base 1 with screws 2 (hard screws).

The pinion 21 attached to the rotating shaft 208 of the head motor 20 is attached to the shaft 105a of the plate 105 for attaching the head motor.
It is always engaged with a selection gear 22 which is rotatably supported by a shaft.

This selection gear 22 is slidable in the axial direction and is normally pushed into a position where it meshes with the intermediate gear 113 by a selection gear spring 23.

The intermediate gear 113 is rotatably supported by the PF roller 3 and always meshes with the intermediate gear II24.

The rotation of the intermediate gear 113 is not transmitted to the PF roller 3,
The signal is transmitted to intermediate gear II24.

The gear receiver of the intermediate gear I124 is pivotally supported by the left side plate 103, and the rotating torque of the intermediate gear I[24 is transmitted to the torque shaft 26 via the shaft gear 25.

Reference numeral 27 denotes a clutch rank, and this clutch 27 is attached to the clutch rack holding portion 107a of the bottom plate 107 of the base 1 so as to be slidable along the printing direction.

A tooth portion 29a of a clutch lever 29 of a carriage 28 can mesh with a rank tooth 27a of the clutch rack 27, and the tooth portion 29a can mesh with the rank tooth 27a of the clutch rack 27, and the tooth portion 29a of the clutch lever 29 of the carriage 28 can mesh with the rank tooth 27a.

Reference numeral 30 denotes a selection lever, which is attached to the shaft center 3a at the bottom 107 of the base l, and one end 30b of which is connected to the clutch rack 27. When the teeth 29a of the clutch rack lever 29 of the carriage 28 engage with the clutch rack 27, the carriage 28 moves slightly to the left, causing the clutch rack 27 to move to the left, which causes the selection lever 30 to move as shown in FIG. Move from A) to (B) in FIG.

As a result, the selection gear 22 can be slid to the right side against the spring 23 at the tip of the selection lever 30, and the PF
The selection gear 22 meshes with the reduction gear 31.

The PF reduction gear 31 is a two-stage gear, with the large diameter gear 31a meshing with the selection gear 22, and the small diameter gear 31b meshing with the selection gear 22.
It meshes with F gear 12.

Therefore, by moving the selection gear 22 to the right against the spring 23, the rotation of the head motor 20 is transmitted to the PF roller 3, and the recording sheet 212 is conveyed (sheet feeding). At this time, since the selection gear 22 is apart from the intermediate gear +13, no rotation is transmitted to the torque shaft 26.

A carriage 28 is guided and supported by a rail portion 107d provided on the base 1 and a carriage shaft 32, and is mounted so as to be slidable in the printing direction (direction along the platen 7). An ink sheet cassette 33 (described in detail later) is mounted on the carriage 28.

Next, the internal structure of the carriage 28 will be explained with reference to FIG.

In FIG. 5, the frame 34 of the carriage 28 is provided with two bearing portions 34a for being pivotally supported by the carriage shaft 32. As shown in FIG.

Various holes are formed in the right side plate 34b of the carriage frame 34 to support the right side of the slide gear 39, gears, etc., and to stop the groove 36 that supports the flexible cable (FPC) 35 and the FPC holding member 37. Screw holes etc. are formed. For example, a hole for supporting a two-stage reduction gear 38 is formed in the right side plate 34b and the wall 34C, and a support portion 40 for the slide gear 39 is formed in the right side plate 34b.
The holes 43 and 43 that support the lever shaft 41 are connected to the walls 34c and 34.
A hole 44.44 is formed in the right side plate 34b and the wall 34d to support the camshaft 42.

Further, in the bottom plate of the frame 34 of the carriage 28, there is a screw hole (not shown) for fixing the carriage motor 45, and a hole 47 through which the pinion 46 attached to the lower shaft 45a of the carriage motor 45 projects. , a hole 48.48 for supporting the clutch rack lever 29, a hole 50.50 for stopping the home sensor 49, and an opening 5 for accommodating the clutch rack lever 29 so as to be able to protrude downward.
1. Rotating shaft 53 of sensor lever 52, carriage roller 5
4, a rib 56 to prevent the lead wire of the home sensor 49 from shorting, and a sensor lever 52.
A hook portion 58 of the return spring 57, a rotation shaft 61 of the head arm 60, etc. are formed.

Further, screw holes (not shown) for attaching the carriage cover 62 are provided at the four corners of the upper surface of the frame 34 of the carriage 28.
is formed.

Furthermore, a carriage gear 63 is provided on the back side of the frame 34.
and shafts 65, 66 for supporting the carriage idler gear 64.

The carriage rollers 54 are for reducing the load when the carriage 28 moves, and are provided on the guide rail 1.
07d Transfer along the top surface.

The carriage motor 45 is a two-wheel type motor, and is provided with a pinion 67 on the upper side in addition to the lower pinion 46.

The carriage 7 gear 63 is a two-stage gear, the large diameter gear 63a of which meshes with the lion 46 of the carriage motor 45, and the small diameter gear 63b of which meshes with the carriage idler gear 64.

This carriage idler gear 64 also meshes with the carriage rack 107c provided on the base 1.

Therefore, when the carriage motor 45 rotates, the carriage 28 moves, and the direction of movement of the carriage 28 is determined by the direction of rotation.

The slide gear 39 has its boss portion rotatably supported by the frame 34, and the torque shaft (having a similar irregular cross section) 26 is fitted into a hole with an irregular cross section passing through the center thereof. , slide gear 39 and torque shaft 26
rotates as a unit.

The slide gear 39 meshes with the large diameter gear 68a of the second gear 68. This intermediate gear 68 is supported by the camshaft 42 together with the cam 69 and the cam 70.

The reduction gear 38 is also a two-stage gear, and the large diameter gear 38
a meshes with the small diameter gear 68b of the intermediate gear 68.

The cam n70 has a small diameter gear 38 of the reduction gear 38.
The gear part 17 that meshes with b, the tip part 52 of the sensor lever 52
A sensor cam 72 in contact with a and a clutch cam 73 in contact with the clutch rack lever 29 are integrally formed.

A head cam 75 in contact with the head lever 74 and a delay cam 77 in contact with the delay lever 76 are integrally formed on the cam 169. cam+69
The fitting portion of the cam n70 and the fitting portion of the cam n70 are engaged with each other so as to rotate together.

The heft lever 74 is for pushing the thermal held door 8 on the held arm 60.

The delay lever 76 delays the separation of the ink sheet for thermal transfer recording, that is, the ink sheet 115 and the recording sheet 2 after being heated by the thermal head 78.
This is to delay the time until the ink sheet 12 is peeled off, and in the operating position (down), the ink sheet 115 is pressed against the recording sheet 212 supported by the platen 7.

In addition to the tip 52a that contacts the sensor cam 72, the sensor lever 52 includes a protrusion 52b that protrudes downward so as to be able to abut a left limiter detection post 107b provided on the base 1, and a home sensor 49. A sensor push portion 79 is formed which is in contact with the sensor push portion 79 .

The sensor lever 52 is rotatably supported by the rotating shaft 53 in a state where the sensor pushing portion 79 is biased by a spring 57 in a direction in which it contacts the home sensor 49 .

The home sensor 49 normally includes a cam 169 and a cam l.
In addition to functioning as a cam sensor that detects the standby position of l70, it also functions as a left limiter that detects that the carriage 28 has reached the left end position.

The clutch rack lever 29 has a tooth portion 29a that can mesh with a clutch rack 27 that is slidably provided on the base 1, a tip portion 29b that is in contact with the clutch cam 3, and is pivoted on the frame 34. It has a shaft portion 29c.

The clutch rack lever 29 is biased by a spring 80 in a direction in which its tip 29b contacts the clutch cam 73.

Next, the helad lever 74 is inserted into the through hole 43 of the frame 34.
．． 43 is rotatably held by a lever shaft 41 inserted through the lever shaft 43. A long hole 74a formed in this head lever 74
A cam roller 81 is supported in a pressed state by the end of the head spring 82, and the head cam 75 is in contact with the head lever 74 via the cam roller 81.

Thus, when the head is down, the spring force of the head spring 82 causes the tip of the head lever 74 to press the thermal head 7 on the head arm 60 against the platen 7.

The helad arm 60 is swingably supported around a shaft 61 provided on the frame 34 in a direction perpendicular to the platen 7 (perpendicular in the illustrated example). In addition, the head arm 60
is prevented from being removed from the shaft 61 by attaching the carriage cover 62.

The flexible cable (FPC) 35 for signal transmission drawn out from the recording head (thermal head) 78 passes through the carriage 28, joins the portion connected to the terminal of the carriage motor 45 and the home sensor 49, and then connects to the carriage 28. Formed in the frame 34 of 28? i36 to the outside of the frame 34, and is positioned and held on the frame 34 by the FPC holding member 37.

At this time, as shown in FIG. 6, a protrusion protruding to the outside is provided around the through hole 83 provided in the frame body 34 through which the torque shaft 26 for transmitting the drive into the carriage 28 passes. 84 is formed. Then, the opening 35C formed in the flexible cable 35 is inserted into the protrusion 8.
4, and the plate-shaped FPC holding member 37
An opening 37a formed in the same manner as above is also fitted into the protrusion 84. Further, by fixing the FPC holding member 37 to the frame body 34 with screws 37C, the FPC 35 is positioned at a predetermined position on the carriage frame body 34 and is held without contacting the torque shaft 26.

Furthermore, by fixing the flexible cable (FPC) holding member 37, the through hole 43 of the frame body 34 is closed.
At the same time, the lever shaft 41 and the cam shaft 42 inserted through the shaft 44 are prevented from being removed. In addition, 37b is a screw hole, and the FPC holding member 37 is attached to the frame 3 with a screw 37C.
This is for attaching to 4.

Reference numeral 84 denotes a head return spring, which is mounted around the rotation axis 61 of the head arm 60 with one end engaged with the head arm 60 and the other end engaged with the carriage frame 34.

The delay lever 76 is rotatably supported coaxially with the delay lever 74 (on the lever shaft 41).

The cam roller 8 is inserted into the long hole formed in this delay lever 76.
5 is pressed and supported by the tip of a delay spring 86, and the delay cam 77 is in contact with the delay lever 76 via this cam roller 85.

Therefore, when the delay lever 76 is down, its tip 76a presses the ink sheet 115 and recording sheet 212 against the platen 7 due to the spring force of the delay spring 86. Note that when the delay lever 76 is in the up position (other than the down position), the delay lever 76 is in contact with the delay cam 77 by a compression spring 76c attached to the spring guide portion 76b of the delay lever 76.

Reference numeral 87 denotes a conductive member for eliminating the electric charge on the ink sheet 115. The conductive member 87 is positioned by the hole of the conductive member 87 and the axis of the frame 34, and the exposed part provided at one end of the flexible cable 35 Conductive portion 35 of
A ground connection structure is adopted in which the conductive member 87 and the conductive member 87 are superposed on the frame 34 and fastened together with screws.

The conductive member 87 is for grounding the ink sheet 115 to eliminate static electricity, and has a shape that protrudes upward from the carriage cover 62, and has a tip 87a.
is in contact with the ground plate 116 inside the ink sheet cassette 33, and this ground plate 116 is in contact with the ink sheet 115 inside the cassette.

The carriage cover 62 is! It constitutes a cassette loading section for freely mounting the ink sheet (ink ribbon) cassette 33 mentioned above, and has guide grooves 88 and 88 for guiding the cassette 33. Claw portions 89 and 89 are formed to fit into the guide holes and prevent them from coming off.

Further, a pin 90 for positioning the cassette 33 left and right is also formed on the cover 62.

A recording sheet regulating plate 91 for regulating the positions of the recording sheet 212 and the ink sheet 115 on the platen 7 is integrally formed at the front end of the carriage cover 62.

The regulating plate 91 is a guide plate for aligning the recording sheet 212 and the ink sheet 115 along the platen 7 during recording, and is made of a transparent plastic molded product. The regulating plate 91 is made of the same transparent plastic as the carriage upper cover 62, and is integrally molded with the carriage cover 62. Note that it is also possible to make the carriage cover 62 opaque and only the regulation plate 91 transparent and integrally mold them.

Further, the recording sheet regulating plate 91 includes a recording head 7.
A scale 91 for displaying the position of 8 with respect to the recording sheet 212 is provided.

In this way, by molding the recording sheet regulating plate 91 integrally with the carriage cover 62, cost reduction can be achieved by reducing the number of parts and simplifying the manufacturing process.

Various ink ribbon cassettes can be exchangeably loaded onto the upper surface of the carriage cover 62, such as an ink ribbon cassette for self-collection described later, an ink ribbon cassette for two-color ribbons, or an ink ribbon cassette for normal one-color parts.

A ribbon lever 92 is rotatably supported by a shaft 93 protruding from the lower side of the carriage cover 62, and the lever 92 is provided with a spring hook 92a, a slide hole 92b, and a ribbon gear shaft 92c. .

94 is a ribbon head slider, which is connected to the ribbon lever 9.
The carriage cover 62 is slidably held in the slide hole 92b of No. 2, and guided by a guide portion 95 of the carriage cover 62.

Reference numeral 96 denotes a ribbon lever spring for always biasing the ribbon lever 92 toward the platen 7.

A two-stage gear type ribbon gear 97 is supported on the ribbon gear shaft 92c of the ribbon lever 92.

The ribbon gear 97 is a two-stage gear that can mesh with the upper pinion 67 of the carriage motor 45 and the ribbon clutch 98. Since it is pivotally supported on the ribbon lever 92, the rotation of the ribbon lever 92 causes this meshing to occur. Can be canceled.

When the head lever 74 is moved away from the head amplifier, the tip of the ribbon head slider 94, which rotates together with the ribbon lever 92, is pressed by the head lever 74. Therefore, since the ribbon gear 97 is separated from the pinion 67 and the ribbon clutch 98 (its outer peripheral gear 98a), the rotation of the carriage motor 45 is controlled by the ribbon clutch 98.
Not transmitted to.

When the head is down, the ribbon head slider 94 and ribbon lever 92 follow the movement of the head lever 74.
rotates counterclockwise, and the large and small gears 9 of the ribbon gear 97
7a and 97b mesh with the pinion 67 and the ribbon clutch outer peripheral gear 98a, so that the carriage motor 45 moves the carriage 28 and winds up the ink sheet 115.

The ribbon clutch 98 constitutes a ribbon winding drive force receiver having an excessive torque release function, which is a friction clutch, and is rotatably supported by a shaft 99 fixed to the carriage cover 62 by press fitting or the like. There is.

The ribbon clutch 98 has a lower gear 98a that can mesh with a small diameter gear 97b of the ribbon gear 97, and transmits power to the take-up spool of the ribbon cassette with a predetermined friction.

Therefore, in this embodiment, by selecting the rotation center 93 of the ribbon lever 92 at a predetermined position different from the ribbon clutch shaft 99, when switching the ribbon driving force from off to on, the ribbon gear (driving force transmission member) The large diameter gear 97a of 97 first engages with the pinion (drive source side) 67 of the carriage motor 45, and then the small diameter gear of the ribbon gear 97 engages with the gear of the ribbon clutch 98 (drive force receiver side).
98a.

Since the drive source side is engaged first in this manner, it is possible to prevent idle rotation during winding of the ink ribbon (ink sheet), and it has become possible to realize a reliable ink ribbon winding operation.

As shown in FIG. 9, the ink ribbon cassette 33 has a supply core 112 and a take-up core l13 rotatably provided in a cassette case 111, and a take-up spool (ribbon drive shaft) 9 of the ribbon clutch 98 on the carriage 28.
8b (FIG. 5), the winding recoa 113 is rotated.

As a result, the ribbon pancake 11 on the supply core 112
4, the ink ribbon (ink sheet) 115 is guided in the direction of the arrow, and is wound onto the winding core 113 while being supplied through the front surface of the recording head 78.

A carriage 28 is disposed inside the cassette case 111, which contacts the ink ribbon 115 and passes through the bottom opening 111a.
A conductive ground plate 116 is attached to contact the tip 87a of the upper conductive member 87.

As described above, the conductive member 87 is pressed into contact with the exposed conductive portion 35a formed at the end of the flexible cable 35 by screwing the conductive member 87 in an overlapping state.

On the other hand, a ground wire 35b is formed in the flexible cable 35, and one end of the ground wire 35b is connected to the conductive portion 35a. It is formed to be grounded via a grounding circuit in 117.

In this way, by electrically connecting the flexible cable 35 and the conductive static eliminator 87.116, the electric charge on the ink sheet in the ink ribbon cassette 33 is removed to the main body substrate 117 using the flexible cable 35, and the carriage It was possible to construct an antistatic device for an ink ribbon (ink sheet) that can eliminate static electricity without interfering with the reciprocating movement of the ink ribbon (ink sheet) and can be made compact with a small number of parts and little space.

Next, a release mechanism in the recording sheet conveying device will be explained.

In FIGS. 2 and 4, the release lever 16 is rotatably supported by the shaft portion 3a of the paper feed (PF) roller 3, and a part (knob) 1 of the lever is operated by hand.
6a and a gear L6b that meshes with the gear 120a of the release shaft 120, and by rotating the lever part 16a in the direction of arrow A, the pinch roller 8 and front roller 9 are separated from the PF crawler, and the recording sheet 212 is freed. It can be done.

The release shaft 120 has a gear part 120a and a shaft part 120b, and the shaft part 120b is rotatably supported by the base l of the recording device.

The shaft portion 120b normally has a circular cross section, but the portion corresponding to the pinch roller 8 and the front roller 9 has a cam-shaped cross section with two sides turned down as shown in FIG.

As shown in FIG. 2, the arm 10 for supporting the shaft portion of the pinch roller 8 and the front roller 9 is pressed toward the circumferential surface of the PF crawler by a pinch spring 11 made of a leaf spring.

As a result, the pinch roller rubber 5 of the pinch roller 8 and the feed roller 9a press the recording sheet 212 on the PF roller 3 so as to maintain the contact state.

Therefore, when the release lever 16 is rotated in the direction of arrow A, the release shaft 120 is rotated by the meshing of the gear 16b and the gear 120a.
The pinch spring 11 is separated from the pinch roller 8 and the support arm 10 by the two-sided cam action of 0, and the outer peripheral surface of the pinch roller 9 and the front roller 9 are separated from the PF roller 3.
The recording sheet 212 and the PF roller 3 are released so that the recording sheet 212 can be taken in and out freely.

FIG. 11 is a block diagram showing the control system of the recording apparatus of this embodiment.

In FIG. 11, 121 is a control unit that controls the entire recording apparatus such as a printer or typewriter, and an MPU (microprocessor) 122 that outputs various control signals according to a control program to control the entire recording apparatus.
A ROM 123 that stores fixed data necessary for control such as the control program, a RAM 124 used as a working area of the MPU 122, a tie 7125 that measures time based on support signals from the MPUI 22 and outputs time information, and various other components. It is composed of an interface section 126 and the like that input and output signals.

Therefore, the control section 121 controls the recording section 127 in response to input from the keyboard 215.

The recording unit 127 includes a printing mechanism that causes a thermal head 78 (having a plurality of heating elements 78a) to generate heat via a head driver 128, and a carriage movement mechanism that moves the carriage 28 by a carriage motor 45 that is driven via a motor driver 129. , the motor driver 1
29 and a carriage motor 45 to wind up the ink sheet (ink ribbon) 115, and a head motor 20 driven via another motor driver 130 rotates the cams 69 and 70 to rotate the head. The paper feed (PF) roller 3 is controlled by using switching means such as a cam mechanism that raises and lowers the delay lever 78 and the delay lever 76 and engages and separates the clutch rack lever 29, the aforementioned forward motor 20, and the selection gear 22.
A conveyance mechanism that conveys (feeds) the recording sheet 212 by controlling the rotation of
A sensor mechanism for controlling the cams 69, 70, etc. is provided.

By the way, in this embodiment, in order to detect whether or not the rotational position of the cam mechanism 69.7° is in the standby position, that is, whether or not the head 78, the delay lever 76, the clutch rack lever 29, etc. are in the standby position. The following mechanisms are provided.

A sensor lever 52 is provided on the carriage 28 near the cam 69.7o so as to be rotatable about a shaft 53. The sensor lever 52 is moved such that the tip end 52a of the sensor lever 52 is in pressure contact with the outer peripheral surface of the sensor cam 72.
is energized.

A protrusion 52b that protrudes downward is formed on the lower surface of the sensor lever 52, and when the carriage 28 comes to the left end position, it collides with the boss 107b on the base 1 and rotates the sensor lever 52 to detect the home sensor. 49 is configured to be able to detect this.

When the cam mechanism 69.7o rotates to the standby position in such a mechanism, the recess 72a comes into pressure contact with the sensor cam 72 of the sensor lever 52 (D tip fm portion 52a), and the sensor lever 52 is rotated by the biasing force of the spring 57. In this state, the push portion 79 of the sun lever 52 presses the actuator 49a of the home sensor 49, and the home sensor 49 is switched from off to on.

Further, even if the cam mechanism 69, 70 rotates from the standby position in either the forward direction (direction of arrow X in FIG. 12) or the reverse direction (direction of arrow Y in FIG. 12), the sensor lever 52 The tip portion 52a is removed from the recess 72a, the sensor lever 52 rotates against the spring 57, and its pushing portion 79 is removed from the actuator 49a, and the home sensor 49 is switched from on to off.

In this way, in this embodiment, the cam mechanism 69.7 is turned on and off by the home sensor 49 consisting of a microswitch.
0 is in the standby position, that is, whether the head 78, the delay lever 76, and the clutch rack 27 are in the standby position.

Furthermore, in this embodiment, the initial position of the carriage 28 (usually the left end position) is detected via the home sensor 49, and for this purpose, the head l of the recording device corresponds to the initial position of the pace carriage 29. boss l in the position
07b is provided.

That is, when the carriage 29 continues to move leftward, the boss 107b hits the downward protrusion 52b of the sensor lever 52, and the home sensor 49, which is a micro switch, is turned off.
8 home positions.

In other words, the home sensor 49 and the sensor lever 52 that turns it on and off serve as a left limiter for detecting the reference position of the carriage 78 and a cam sensor for detecting the standby position of the cam mechanism 69, 70. , is configured such that one home sensor 49 can perform initial control (initial position setting) of each operating section when the power of the recording apparatus is turned on.

For example, if the cam mechanisms 69 and 70 are set in advance to the standby position and the home sensor 49 is on, then the carriage 2
When moving 9 to the left and reaching the left end, the boss 107b
The sensor lever 52 rotates against the return spring 57 due to the collision with the downward protrusion 52b, and the tip 52a of the sensor lever 52 separates from the recess 72a of the sensor cam 72, and the push part 79 of the sensor lever 52 is pressed against the actuator. Move away from 49a.

Thereby, the home switch 49 is switched from on to off, and it can be detected that the carriage 28 is at the initial position.

Note that when switching at this time, the carriage motor 45
When the carriage 28 is placed at a very small distance (e.g.
m) Since the carriage 28 is moved leftward and then stopped, in this embodiment, after this stoppage, the carriage 28 is moved rightward a certain distance and positioned so that the protrusion 52b of the sensor lever 52 is separated from the boss 107b on the base l, The position of the carriage 28 at this time is set to the initial position.

The operations of raising and lowering the head 78 and raising and lowering the delay lever 76 of the image recording apparatus (printer, typewriter, etc.) described above will be described below.

When the head motor 20 is rotated forward from the standby position of the cam mechanism 69, 70, which will be described later, the selection gear 22 meshing with the motor pinion 21 also rotates, and the torque shaft is The rotation is transmitted to the gear 25, and the torque shaft 26 rotates.

This torque shaft 26 is a shaft having an oval (deformed) cross section and is disposed through the carriage 28.
6 rotations are transmitted into the carriage 28.

First, the slide gear 39 that is slidably fitted onto the torque shaft 26 rotates as the torque shaft 26 rotates.

This rotation is transmitted to the gear 71 which rotates together with the cam 1170 via the two-stage intermediate gear 68 and the reduction gear 38, and the cam 69 and the cam [70 rotate together.

In other words, under normal conditions, when the head motor 20 rotates forward, the cam! , cam ■ (cam mechanism 69.70) rotates.

When the cam mechanism 69, 70 rotates from the standby position, first,
It is detected that the sensor lever 52 that is in contact with the sensor cam 72 moves up the cam base, and that the home sensor 49 that was in contact with the sensor lever 52 halfway up the slope switches from on to off, leaving the standby position. be done.

When the cam mechanism 69, 70 further rotates in the forward rotation direction, the cam roller 81 in contact with the head cam 75 is pushed up, and the head lever 74 accordingly rotates around the lever shaft 41 parallel to the platen 7. , the head 78 on the head arm 60, which is rotatable around the axis 61 perpendicular to the platen 7, is pressed from behind to lower the thermal head 78. When the cam roller 81 climbs up the slope of the cam beyond a certain level, the thermal head 78 is completely pressed against the platen 7 (down).

At this time, the radii (cam lifts) of the delay cam 77 and clutch collar 73 have not changed yet, so the delay cam 76 and clutch rack lever 29 that are in contact with them are maintained at their original positions without moving.

FIG. 12 is a diagram showing the operation of the cam mechanism 69.70, in which (A) shows the standby position (angle is 0 degrees), and (B) shows the cam mechanism 69.70 in the normal rotation direction ( The head lever 74 has been rotated approximately 130 degrees in the direction of arrow X), and the head lever 74 has been displaced to the down position, but the delay lever 76 is still in the up position.

When the cam mechanisms 69 and 70 are further rotated in the normal rotation direction (X direction), the cam roller 85 also moves up the slope of the delay cam 77, and accordingly, the delay lever 76 also rotates in the down direction. As shown in FIG. 12(C), when the delay lever 76 is rotated approximately 245 degrees in the forward rotation direction, the delay lever 76 is completely pressed against the platen 7. At this time, the head remains in pressure contact with the platen 7 for 7 days.

When the delay lever 76 is down, its tip 7
By pressing the ink sheet 115 against the recording sheet 212 at 6a, the ink sheet heated by the thermal head 78 is heated.
1t (after printing) The ink sheet 115 is the recording sheet 212
This is to delay the time it takes for the film to peel off.

Therefore, in this embodiment, the delay lever 76
is mounted so as to be able to swing (up and down) around a center line (lever shaft 41) parallel to the platen 7, so the delay lever 76 is movable in a direction substantially perpendicular to the platen 7. When performing normal printing with 76 up, printing on the recording sheet 212 can be easily confirmed (visually recognized), and the ink ribbon (ink sheet) 115 can be placed in front of the recording head 78 and the delay lever 76. A structure for mounting the delay lever 76 that can be easily mounted has been obtained.

The cam control of the head down and the delay lever down is carried out by rotating the front motor 20 a predetermined number of steps from this reference time, using the time when the home sensor 49 turns off after the first rotation of the front motor 20 starts. It is being done. In this way, since the control is started based on the state in which the motor 20 has started rotating, it is possible to prevent rotational errors due to variations in huff crush between each gear, and to perform accurate control.

When raising the delay lever 76 and raising the head 78, the head motor 20 is reversed from the head-down and delay lever-down states to reverse the cam mechanisms 69 and 70.

By reversing the rotation, a movement completely opposite to the down movement during normal rotation described above occurs, and first, the delay lever 76 is amplified via the cam roller 85 that is in contact with the delay cam 77, resulting in the shift shown in FIG. 12(B). Then, the head lever 74 is raised via the cam roller 81 that is in contact with the head cam 75, and the thermal head 78 is raised.

Finally, the sensor lever 52 in contact with the sensor cam 72 is rotated by the recess 52a as shown in FIG. 12(A), and the home sensor 49 is turned on.

When the home sensor 49 turns on, a brake is applied to the head motor 20, and the head motor 20 is
to stop. At this time as well, the sensor 49 causes the motor 20 to
Since the rotation of the cam mechanism 69 and 70 is controlled, the cam mechanism 69 and 70 can be stopped at a stable predetermined position with little variation.

If the motor 20 is reversed from the state where the head is down and the delay lever is up, that is, the state shown in FIG. 12(B), the head 78 can be returned from the down position to the up position.
It can be returned to the standby position in the same manner as described above.

As is clear from the above operation, in this embodiment, the head-up and delay lever-up states are in the standby state of the cams 69 and 70 when the home sensor 49 is turned on.

Next, the lower pinion 46 of the carriage motor 45 in the carriage 28 is engaged with the rack 107c on the recording device base 1 via the carriage idler gear 64 and the carriage gear 64, and when the carriage motor 45 is rotated in the normal direction, The carriage 28 moves to the right, and when the carriage motor 45 is reversed, the carriage 28 moves to the left.

On the other hand, since the ribbon lever 92 that is pivotally supported by the gear ridge cover 62 is in contact with the head lever 74 via the ribbon lever slider 94, when the head is down, the ribbon lever 92 rotates, and the gear of the ribbon clutch 98 is rotated. A two-stage gear type ribbon gear 97 is inserted between 98a and the upper pinion 67 of the carriage motor 45, and the rotation of the carriage motor 45 is transmitted to the ribbon clutch 98.

In this case, the center of rotation of the ribbon lever 92 (the position of the shaft 93) is selected at a predetermined position apart from the axis of the ribbon gear 97 or the ribbon clutch 98, and the two-stage gear type ribbon gear (driving force transmission member) 97 is The ribbon clutch 98 is positioned so as to contact the pinion gear (drive source side) 67 of the carriage motor 45 earlier than the gear 98a (ribbon drive force receiver).

Therefore, when the carriage motor 45 rotates, each gear can immediately engage, and when the carriage motor 45 rotates, the ribbon clutch 98 also rotates reliably without causing idle rotation.

Further, when the head is raised, the ribbon gear 97 is separated from both the gear 98a of the ribbon clutch 98 and the pinion gear 67 of the carriage motor 45, and the carriage motor 45
rotation is not transmitted to the ribbon clutch 98.

In other words, in the head-up state, even if the carriage 28 moves left and right, the ribbon clutch 98 does not rotate and ribbon winding is not performed.

In this embodiment, the motor (carriage motor) 45 that performs the two functions of transporting the ink sheet (ribbon winding) and reciprocating the carriage 28 is a double-shaft motor, and one shaft (fixed to the lower shaft) is used. The drive force for reciprocating the carriage 28 is transmitted by the pinion gear 46), and the other shaft (pinion gear 67 fixed to the upper shaft) transports the ink sheet (winding up the ink ribbon 115). It is configured to transmit driving force.

Therefore, the carriage 28 and the ink rib 74-i
= It is now possible to operate the drive system of Knit 3 with a single motor and to configure it with a compact mechanism with a small number of parts.

Next, the operation of the recording sheet conveying means will be explained.

First, when the head motor 20 is rotated from the standby position of the cam mechanism 69.70 in the opposite direction, that is, in the opposite direction to the aforementioned head-down direction, the cam mechanism 69.70 Rotation is transmitted.

When the cam mechanisms 69 and 70 rotate in the opposite direction (in the direction indicated by arrow Y in FIG. 12), the sensor lever 52 in contact with the sensor cam 72 is rotated, and the home sensor 49 is rotated in the same manner as in the case of head down. changes from on to off.

When the cams 69 and 70 are further rotated, the clutch cam 7
The clutch rack lever 29 that is in contact with 3 rotates to the state shown in (R) in FIG. 12, and the peak of the clutch rack lever 29 is slidably placed on the recording device base l. It meshes with the clutch rack 27.

The rotation of the clutch cam 73 is also controlled by rotating the head motor 20 a predetermined number of steps based on the time when the home sensor 49 is turned on or off, as in the case of head down.

When the cams 69 and 70 rotate in the opposite direction, the radius of the circumferential cam of the head cam 75 and the delay cam 77 does not change, so the head lever 74 and the delay lever 76
Both remain in the up position without moving from the standby position.

Next, with the clutch rack lever 29 in the carriage 28 and the clutch rack 27 engaged, the carriage motor 20 is rotated by a predetermined amount to move the carriage 28 slightly to the left. Then, the latch rack 27 becomes slidable.
moves to the left by the same amount, and this causes selection lever 3 to move to the left.
0 rotates around the axis 30a (FIG. 3), the selection gear 22 is slid to the right in FIG. 3 against the spring 23, and the selection gear 22 meshes with the intermediate gear +13. position〔
3 (A)] to the position where it meshes with the PF reduction gear 31 [
Move to (B) in Figure 3. Note that the selection gear 22 and the pinion gear 21 of the head motor 20 are in mesh with each other.

Next, in this state, the head motor 20 is rotated and the pinion gear 21-selection gear 22-P of the head motor 20 is rotated.
The rotation is transmitted to the PF (paper feed) roller 3 via the F (paper feed) reduction gear 31→PF gear 12.

In this case, when the head motor 20 is rotated in the normal direction, the recording sheet 212 is sent in the reverse index direction, and when the head motor 20 is rotated in the reverse direction, the recording sheet 212 is sent in the index direction.

After rotating the head motor 20 by a predetermined amount, the carriage eater 45 is rotated forward by a predetermined amount to move the carriage 28 slightly to the right. Then, the clutch rack 27 also slides to the right by the same amount, the selection lever 30 is returned to its original position, and the selection gear 22 is slid by the spring force of the spring 23 to its original position, that is, the pinion gear 2 of the head motor 20.
1 and intermediate gear! It is returned to the position where it engages with 13.

At this moment, the PF roller 3 is separated from the head motor 20, so the stopping position of the PF roller 3 is determined by the detent gear 17 attached to the right end of the cough PF roller 3 and the detent gear 17 attached to the base 1 so as to engage with the detent gear 17. is precisely determined by a detent spring (not shown).

Therefore, the rotation of the PF roller 3, that is, the recording sheet 212
Even if the feed amount varies slightly due to bank lash between the gears from the motor 20 to the PF roller 3,
Since it is ultimately determined by the detent, it can be maintained accurately.

Finally, the head motor 20 is rotated forward and the home sensor 4 is
The cam mechanism 69, 70 is returned to the standby position by the same control as at the time of hand-up, in which the motor 20 is rotated until the motor 9 is turned on, and then the motor 20 is braked to stop the motor 20 after a predetermined number of steps.

As a result, the clutch rack lever 29 also returns to the standby position, and the engagement with the clutch rack 27 is also released.

According to the above embodiment, the movable drive transmission switching means (clutch rack 27, selection lever 30, selection gear 22 ) and engaging means (clutch cam 73, clutch rack lever 29) for engaging the carriage 28 and the drive transmission switching means, and the conveying means (PF roller) by the motor 20 is provided by the movement of the carriage 28. 3) and the up-down drive of the recording head 78, the up-down drive of the recording head 78 and the up-down drive of the recording sheet 21
It is now possible to switch between sheet feeding and sheet feeding at any position on the carriage 28. Therefore, sheet feeding (line feed, etc.) can be performed at any position on the carriage 78, and even with one motor 20, the recording speed can be changed. It was possible to configure an image recording device that can be shortened.

Furthermore, normally the driving force of the motor 20 is applied to the recording head 78.
The output of the motor 20 is transmitted to move the delay lever 76 up and down, and the engaging means (clutch cam 73, clutch rack lever 29) is also driven by the output of the motor 20, making it possible to reduce the weight and size. can be,
An image recording device has been obtained in which the switching control circuit can be easily made simple and accurate.

In the above embodiment, the detection of the standby position of the cam member 75 for raising and lowering the recording head 78 and the home position of the carriage 28 (post 1 on the base 1) are also performed.
Since the sensor 49 that performs both detection (the position that hits 07b) is used, the initial position setting can be controlled with one sensor 49, making the image recording device more compact and reducing costs. I was able to figure it out.

Furthermore, the recording head 78 is moved down by normal rotation of the cam means 69, 70 from the standby position, and driving force is transmitted to the sheet conveyance means CPF roller 3) by reverse rotation from the standby position. When setting the position, the cam means 69.70 is rotated once in the forward direction to find the standby position, and then rotated in the reverse direction if the standby position is not found, so that no matter which position the cam means 69.70 is An image recording apparatus has been obtained that can immediately perform initial position setting and can improve the accuracy and speed of control operations.

Next, the initial position setting (initialization) upon power-on of the recording apparatus described above will be explained with reference to the flowchart of FIG. 13.

In FIG. 13, when the power is turned on, first, in step S1, it is determined whether the home sensor 49 is on or off. 76 and the clutch rack 27 are in the standby position, step S7
Hejyump.

On the other hand, if the cam mechanism 69, 70 is not in the standby position or if the home sensor 49 is off due to a collision between the boss 107b on the base 1 and the protrusion 52b of the sensor lever 52, the process proceeds to step 32B and the carriage motor 45 is turned off. The carriage 28 is driven a certain distance to the right. This is to position the carriage 28 outside the action range of the boss 107b of the base 1 in the case of the collision (when the left rim contacts).

Subsequently, in step S3, the home sensor 49 is turned on again.
It is determined whether the home sensor 49 is off, and if it is on, that is, when the home sensor 49 was in an off state at the time of determination in step S1 and turned on due to the movement, step S7
Hejyump.

On the other hand, if it is off, that is, if the cam mechanism 69, 70 is not in the standby position, the process proceeds to step S4, where the head motor 20 is reversed until the home sensor 49 is turned on (
until the cam mechanism 60.70 is in the standby position) cam mechanism 6
9. Rotate 70 in the reverse direction to stop the head motor 20.

When the cam mechanisms 69 and 70 are in the direction in which the clutch rack lever 29 moves, that is, when the recording sheet is being conveyed, the home sensor 49 is turned on as the cam mechanism rotates in the reverse direction. , jumps to step S7 via step S5.

However, if the cam mechanism 69, 70 is in the head-down direction, no matter how much the cam mechanism is rotated in the opposite direction, the home sensor 49 remains off, and the cam mechanism 69, 70 remains off.
9.70 hits the stopper and stops rotating. At this time, the head motor 20 is rotated a certain number of steps in the reverse direction, and when the home sensor 49 is not turned on, the head motor 20 is stopped, and the process proceeds to step S6 via step S5.

In step S6, the head motor 20 is now rotated in the normal direction until the home sensor 49 is turned on (cam mechanism 69.
The cam mechanisms 69 and 70 are rotated in the normal rotation direction (until the cam mechanisms 70 reach the standby position), and the process proceeds to step S7.

Now, no matter what position the cam mechanism 69.70 is in, the cam mechanism 69.70 is executed in step S4 and step S6.
70 is in the standby position, and the carriage 28 is outside the action range of the boss 107b of the base l of the recording apparatus.

In step S7, the carriage 28 is moved to the left by driving the carriage motor 45, and the home sensor 49
When the carriage motor 45 is turned off, the drive of the carriage motor 45 is stopped, and the carriage 28 is stopped.

Next, in step S8, the carriage 28 is moved a certain distance to the right so that the protrusion 52b of the sensor lever 52 is separated from the boss 107b on the base 1.
Position 8.

Next, in step S9, the head 78 is lowered and blank printing is performed for a predetermined number of characters to remove sagging from the ink ribbon 115.

Then, the position of the carriage 28 is set as the initial position, that is, the leftmost printing position, and in the printing (recording) standby state of step S10, the printing data input standby state is entered.

With the control described above, the carriage 28 when the power is turned on is
and the position of the cam mechanism 69, 70, the respective timing charts for cases 1 to 4 described below (
The operations shown in FIGS. 14 to 17) are executed.

In case 1 shown in FIG. 114, the carriage 28 is located at a position where the protrusion 52b of the sensor lever 52 is away from the boss 100b on the base 1, and the cam mechanisms 69 and 70 are at the standby position so that the home sensor 49 is turned on. In this case, only the carriage 28 is driven according to the on/off state of the home sensor as shown in the graph of FIG. The ink sheet is removed from the ink sheet, the head is raised, and the printer enters a standby state where it waits for data.

In the case 2 shown in FIG. 15, the carriage 28 is located at a position where the protrusion 52b of the sensor lever 52 hits the boss 107b on the recording device base 1, and the home sensor 49 is turned off. .70 shows the operation when the power is turned on while in the standby position.

In this case as well, only the carriage 28 is driven according to the on/off state of the home sensor 49 as shown in the graph of FIG. Enters standby state waiting for data.

Case 3 shown in Figure 16 and Case 4 shown in Figure 17
, the cam mechanism 69,70 is in a position other than the standby position,
This shows the operation when the power is turned on while the home sensor 49 is off. In case 3 of FIG. The operation when the cam mechanism 69, 70 is located on the driving side is shown, and case 4 in FIG. 17 shows the operation when the cam mechanism 69, 70 is located on the head down side.

In these cases, the carriage 28 is located near the left end and the protrusion 52b of the sensor lever 52 and the boss 10 on the base 1
7b may be in a state of collision, so first move the carriage 28 a certain distance to the right, and then the carriage 28 and the cam mechanisms 69 and 70 will move in response to the on/off state of the home sensor 49. Figures 16 and 17
It is driven as shown in the timing chart in the figure, and finally performs blank printing to eliminate sagging of the ink sheet (ink ribbon) 115, performs head amplification, and enters a standby state in which it waits for data.

When the power is turned on, control operations are performed to set the initial positions according to the positions of the carriage 28 and the cam mechanisms 69 and 70 as described above, and the recording operation (printing, sheet feeding, etc.) can enter a standby state.

Note that after entering the recording operation standby state, the position of the carriage 28 is constantly detected by a counter (not shown) until the power is turned off, so there is no need to detect the initial position again.

The carriage 28 is attached to the boss 107b on the base l of the recording device.
The home sensor 49 is only involved in detecting the standby positions of the cam mechanisms 69 and 70 that are activated in conjunction with the recording operation, as well as the standby positions of the head 78, the delay lever 76, and the clutch rack lever 29. I come to do it.

Next, the printing operation of the recording apparatus described above will be explained.

FIG. 18 is a timing chart of printing operation.

In the printing operation, first, the operation is started by inputting capital letters, symbols, etc. using the keyboard 215.

Initially, the head motor 20 is rotated in the normal direction, and the head is lowered when a predetermined number of steps are counted from the time when the home sensor 49 is turned off as described above.

Next, the carriage motor 45 is rotated and the carriage 28
move to the right.

At this time, the carriage 28 performs a run-up before printing and accelerates, and after the speed of the carriage 28 is stabilized at a constant speed, printing (applying voltage to the head 78) is performed.

Thereafter, a run-up after printing is performed, the speed is decelerated, and the motor 45 is stopped.

At this time, as mentioned above, head down and the carriage 28
When moving the ribbon 115 to the right, the ribbon clutch 98 is used to control the ribbon 115.

Next, the head motor 20 is reversed, and when the home sensor 49 turns on as described above, the brake is applied to stop the motor 45 and the head is raised.

Finally, in preparation for the next printing, the carriage 28 is moved to the left from the beginning of the next printing by the amount of run-up before printing, and the printing operation is completed.

Next, the above-mentioned self-collection ribbon or so-called two-color ribbon (ribbon disclosed in Japanese Patent Application No. 59-260403 or Japanese Patent Application No. 60-298831)
The ink printing of the first layer will be described.

Note that the ink layer is in a stacked relationship with the first layer and the second IIT.

In this case, selection of the ribbon cassette 33 is performed using the keyboard 2.
15, the ribbon cassette 33 is set and the ribbon mode is switched, or the ribbon mode may be automatically switched using a dedicated changeover switch or a contact provided in the carriage 28 by providing a detection hole in the ribbon cassette 33.

The printing state in this case is shown in FIGS. 19(a) and 19(b).

In FIG. 19, 900 is the substrate of the ink ribbon 115, 901 is a multilayer ink layer, 78b in the drawing shows the evaporation part of the head 78, and D shows the recorded image.

FIG. 20 is a timing chart for performing an erasing operation using a self-correction ribbon, and FIG. 21 is a partial plan view schematically showing the erasing state in this case.

In this case, the erasing operation is started by first inputting an erasing key provided on the keyboard 215.

First, the carriage 28 is moved to the left from the beginning of the erasing position by the amount of run-up before erasing.

Next, the head motor 20 is rotated in the normal direction, and when a predetermined number of steps are counted after the home sensor 49 is turned off as described above, the head is lowered, and when a predetermined number of steps is further counted, the delay lever 76 is rotated. Also goes down.

At this time, the carriage 28 performs a run-up before erasing and accelerates, and as shown in FIG. 21, after reaching a constant speed, a voltage is applied to the head 78 at a position near the printing area to heat the heat generating part 78b. When the ink comes into contact with the ribbon 1, the printed portion D (adhered ink) is peeled off from the recording sheet 212, and the ribbon 1
It adheres to the ink layer 901 of No. 15 as adhesion ink E.

Then, the run-up is performed in the same way as after printing, but the run-up is carried out at a constant speed as shown in FIG. 20 until the delay lever 67 passes the printing area, and then the motor is decelerated and the carriage motor 45 is stopped.

Next, as shown in FIG. 20, when the head motor 20 is reversed and the home sensor 49 is turned on as described above, the brake is applied to stop the head motor 20, and the delay lever 76 is amplified and the head motor is activated.

Finally, the carriage 28 is moved in preparation for the next printing, and the erasing operation is completed.

Next, the printing operation when using a two-color ribbon will be described with reference to the time chart of FIG. 22.

When printing with the first Fi ink using a two-color ribbon, it is the same as normal <1> color printing.

When printing the second layer of ink, the operation shown in FIG. 22 is performed, which is basically the same as in the case of erasing the self-collection ribbon in FIG. 20.

That is, in order to delay the separation of the ribbon 115 from the recording sheet 212 after printing, the operation of lowering the delay lever 76 as shown in FIG. The printing operation is completed through a series of movements: down, printing while moving the carriage 28 to the right, moving the head 78 and delay lever 76 up, and moving the carriage 28 to the left.

Next, the conveyance operation of the recording sheet 212 will be explained with reference to the timing chart of FIG.

When transporting recording sheets (sheet feeding), use the neturn key and INDEX key 1 provided on the keyboard 215.
The sheet is fed by inputting the Reverse INDEX key, but if the carriage 28 is located at a position other than the left end, first, by inputting the Return key, the carriage motor 45 is driven to bring the 'ζ carriage 28 to the left end.

Therefore, the sheet feeding operation as described above is performed, but first, the head motor 20 is reversed, the clutch rack 27 is held by the clutch rack lever 29, and the carry nozzle 28 is moved to the left by a slight amount by the carry ridge motor 45. let Thereby, the head motor 20 is directly connected to the paper feed (PF) roller 3 via the selection gear 22.

Then, the head motor 20 is rotated forward and backward to
Perform NDEX and Reverse INDEX.

Next, the carriage 2 is moved to the right by a slight amount by the carriage motor 45 (returned), and the head motor 20 is directly connected to the cam mechanism 69, 70, and the head motor 20 is rotated in the normal direction, thereby leveraging the clutch rack lever. 29 is released, and the feeding operation of the recording sheet 212 (paper feed operation) is completed.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, an image recording apparatus that records an image on a recording sheet includes a recording head for recording an image on the recording sheet, and a platen that holds the recording head. a carriage that reciprocates along the recording sheet, a conveying means for conveying the recording sheet, and a motor that provides driving force for driving the first general feeding means and for raising and lowering the recording head;
a movable drive transmission switching means provided to be able to engage with the carriage at any position within a reciprocating range of the carriage; and an engagement means for engaging the carriage and the drive switching means. , and is configured to switch between driving the conveying means by the motor and driving the recording head up and down by the movement of the carriage, so that the sheet can be conveyed at any position of the recording head. can be easily switched to the state,
It has become possible to maintain the recording speed at a high level by quickly switching the HIM motor.

[Brief explanation of the drawing]

1 is a perspective view showing a schematic structure of an image recording apparatus according to an embodiment of the present invention, FIG. 2 is a vertical sectional view on the right side of the carriage of the image recording apparatus shown in FIG. 1, and FIG. 3 is a view similar to that shown in FIG. 1. The power switching mechanism of the head motor of the image recording device is shown in (A
) is a plan view showing the up-down drive state of the head, (B
) is a plan view showing when the recording sheet is conveyed, FIG. 4 is a side view showing the release mechanism of the sheet feeding means in FIG. 1, and FIG.
The figure is an exploded perspective view of the carriage of the image recording device shown in FIG.
Figure 6 is a partial cross-sectional view of the FPC holding member installation part in Figure 5, Figure 7 is a plan view of the sensor lever and home sensor in Figure 5, and Figure 8 is the internal structure of the carriage in Figure 5. FIG. 9 is a partially cutaway plan view showing the inside of the ink ribbon cassette mounted on the carriage cover.
10 is a partial vertical sectional view showing the ribbon grounding means of the ink ribbon cassette shown in FIG. 9, FIG. 11 is a block diagram of the control system of the image recording apparatus shown in FIG. 1, and FIG. 12 is the cam mechanism shown in FIG. 1. A schematic side view showing the operation of various cams of the 13th
The figure shows the flowchart 1 of the initial position setting operation of the image recording device shown in Fig. 1, and Figs. 14 to 17 respectively show the various modes (case 1 to case 4) during initial position setting shown in Fig. 13. Fig. 18 is a time chart during printing operation of the image recording device shown in Fig. 1, Fig. 19 is a schematic plan view showing the normal printing state, and Fig. 20 is a time chart during erasing using the Collexicon ribbon. 21 is a schematic plan view showing the state when erasing as shown in FIG. 20, FIG. 22 is a timing chart of the two-color printing operation of the image recording device shown in FIG. 1, and FIG. 23 is a timing chart of the operation. FIG. 1 is a timing chart of the sheet feeding operation of the image recording apparatus, and FIG. 24 is an external perspective view of an electronic typewriter suitable for applying the present invention. i-1111...-Base of recording device, 3--
−−−−・−・・−・−・Sheet feed roller, 7 −−
--------Platen, 8------Pinch roller, 9------Front roller, 10------
−・−・−・Support arm, ti −11−−−
Leaf spring, 20--1--Head motor, 22-Selection gear, 26--1-Lux axis, 27 Clutch rank, 28--Carry, 34-
frame carriage), 35 - flexible cable (FPC), 37 ---- FPC holding member,
41 Lever shaft, 42 ---1.-Camshaft, 45--Carriage cover, 69.70 ------1 Cam mechanism, 74 -------1 Head lever, 76--Dilent lever, 78 --- Recording head (thermal head), 87------------- Conductive member;
91...-m--...- Recording sheet regulation plate,
91a -・-1・-scale, 97 -------
Ribbon gear, 98-1 ~--------- Ribbon clutch, 115...------ Ink sheet (ink ribbon), 116 -----------
---Earth plate, 212 ・--------m-Recording sheet. Agent Patent Attorney Yasushi Ooto Law Figure 4 Figure 6 J ¥- Procedural Amendment (
Method) September 2, 1986

Claims (3)

[Claims] (1) An image recording apparatus that records an image on a recording sheet, which includes a recording head for recording an image on the recording sheet, a carriage that holds the recording head and moves back and forth along a platen, and the recording head. a conveyance means for conveying the sheet; a motor that provides driving force for driving the conveyance means and for raising and lowering the recording head; and a motor that engages with the carriage at any position within the range of reciprocating movement of the carriage. a movable drive transmission switching means displaceable; and an engagement means for engaging the carriage and the drive switching means; An image recording apparatus characterized in that the image recording apparatus is configured to switch between driving of the recording head and up-down driving of the recording head. (2) The image recording apparatus according to claim 1, wherein the motor is configured to also drive the engaging means. (3) The image recording apparatus according to claim 1 or 2, characterized in that, under normal conditions, the driving force of the motor is transmitted to move the recording head up and down.