JP2623637B2 - Cassette loading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The cassette loading device of the present invention will be described according to the following items.

A. Industrial applications B. Summary of the invention C. Prior art a. Background art b. Prior art D. Problems to be solved by the invention E. Means to solve the problems F. Examples a. Tape cassette [Figs. 12 to 16] b. PCM audio tape recorder [Fig. 2] c. Cassette unit [Fig. 4] d. Cassette loading unit [Figs. 1 to 11] d-1. Chassis [Fig. 4] d-2. Sliding body [Fig. 2, Fig. 3, Fig. 5, Fig. 6] d-3. Cassette mounting part [Fig. 1, Fig. 3, Fig. 5, Fig. 5, FIG. 6] d-4. Cassette mounting portion support mechanism [FIGS. 2, 3, and 5]
Fig. 6, Fig. 6] d-5. Cassette holder [Figs. 1 to 3, Fig. 5, Fig. 6
Figure] d-6. Limiter section [FIGS. 3 and 5] d-7. Frame member [FIGS. 1 to 3 and FIGS. 5 to 7] d-8. Driving section [FIG. 4] To FIG. 6, FIG. 9 to FIG. 11] d-9. Frame member lock mechanism [FIG. 2, FIG. 3, FIG. 5 to FIG. 7] d-10. Elevating mechanism [FIG. 6, 8, 9
Figure] e. Operation [Fig. 1, Fig. 5, Fig. 6, Fig. 11, Fig. 16] e-1. Insertion of tape cassette e-2. Loading operation e-2-a. Retraction operation e- 2-b. Lowering operation e-3. Unloading operation G. Effects of the invention (A. Industrial application field) The present invention relates to a novel cassette loading device.
For details, use a cassette in which a recording medium is stored and a slidable shutter is provided at the bottom.The shutter is retracted during the loading operation of the loading operation of loading the cassette and mounting the recording medium driving unit. In the cassette loading device that needs to be opened, the structure is simplified, the number of parts is reduced, the assembly is simplified, the reliability is improved, and the cost is reduced. An object of the present invention is to provide a novel cassette loading device that prevents unnecessary movement of a frame member seen from the outside.

(B. Summary of the Invention) A cassette loading device according to the present invention is provided with a sliding member having a cassette mounting portion that moves from a pull-in completion position to a recording medium driving portion and a frame surrounding the cassette. The shutter member is slidably supported on the chassis separately in the cassette retracting direction, and the sliding member and the frame member are relatively moved during the retracting operation, so that the shutter pressing member is provided on the cassette mounting portion of the sliding member. Presses the shutter of the cassette to the open position, thereby simplifying the structure, reducing the number of parts and simplifying the assembly, thereby improving the reliability and reducing the cost. Unnecessary movement such as vibration does not occur in the frame member that is visible from the outside while being moved to the recording medium drive unit after being pulled in.

(C. Prior Art) (a. Background Art) There are various types of tape cassettes, such as audio tape cassettes and video tape cassettes, and the cassette cases of these tape cassettes usually have an engagement formed on a tape reel. The hole is formed with a hole for engaging a reel engaging shaft provided on the deck side, that is, an insertion hole for inserting the reel engaging shaft.

By the way, these tape cassettes containing a magnetic tape as a recording medium hate the intrusion of dust, but in particular, for example, a tape cassette for PCM recording has little dust or the like on the magnetic tape due to its recording method. However, if the recording signal is dropped out of the portion due to the adhesion, the reproduction of the portion becomes impossible, so that the inside of the cassette case needs to be kept as dust-free as possible. Therefore, a tape cassette for PCM recording is generally provided with a shutter for opening and closing the insertion hole of the cassette case. That is, when the tape cassette is not used, the dust is held in a position for closing the insertion hole formed in the cassette case (hereinafter, referred to as a “close position”), so that external dust enters the cassette case. The shutter is moved to a position where the insertion hole of the cassette case is opened (hereinafter, referred to as an "open position") only when used.

Therefore, a cassette loading device for loading a tape cassette having such a shutter needs to be configured so that the shutter can be moved to an open position before the cassette is loaded to a predetermined mounting position. is there.

(B. Prior art) A cassette loading apparatus meeting the above-mentioned needs is disclosed in Japanese Patent Application Laid-Open No. 61-283060.

This cassette loading device has the following configuration.

The sliding frame (65) is slidably supported on the chassis (44),
The sliding frame (65) supports the cassette holder (83) movably in the up and down direction, and furthermore, a holder frame (53) surrounding the cassette holder (83) to provide a space for holding the cassette (1). 133) is attached to the sliding frame (65).

The cassette (1) is placed on the cassette holder (83) within a range surrounded by the holder frame (133). In this state, the length of the inner surface of the holder frame (133) in the front-rear direction is set so that the cassette (1) can move in the front-rear direction (the sliding direction of the sliding frame (65)) within a predetermined range. It is longer than the length in the front-rear direction of (1).

The first cassette pressing lever (142) is rotatable on the sliding frame (65) behind the cassette holder (83), and the second cassette pressing lever (143) is rotatable on the front side of the cassette holder (83). It is provided in.

Then, when the cassette (1) is loaded, the first cassette pressing lever (142) presses the cassette (1) forward, whereby the cassette (1) is moved forward. Then, a ridge (91) provided on the cassette holder (83) unlocks a shutter lock means provided on the bottom of the cassette (1), and then provided on the front end of the cassette holder (83). The projecting pieces (90) and (90) press the shutter provided at the bottom of the cassette (1) relatively rearward,
This moves the shutter to the open position and is locked there by the locking means.

Next, when the cassette (1) is unloaded, the second cassette pressing lever (143) presses the cassette (1) backward, whereby the cassette (1) is moved backward. At this time, the ridge (91) releases the lock of the shutter to the open position by the shutter lock means, whereby the shutter urges the elastic force toward the closed position. Is moved toward the closed position by the resilient means, where it is locked by the locking means.

(D. Problems to be Solved by the Invention) In the above-described conventional cassette loading device, a sliding member that moves with respect to the chassis (44) to open and close the shutter of the cassette (1). Frame (65)
Are further provided with first and second cassette pressing levers (142) and (143) that move with respect to the sliding frame (65), and these cassette pressing levers (142) and (143) are moved at a predetermined timing. Mechanism is required, the structure is complicated,
There is a problem that the number of parts is large and the number of assembling steps is increased, so that not only the reliability is lowered but also the cost is increased.

Further, since the cassette holder (83) is supported by the sliding frame (65), when the cassette holder (83) descends from the retracted position to the cassette mounting portion or moves from the cassette mounting portion to the retracted position, The sliding frame (65) vibrates,
The holder frame (133) in which the vibration is fixed to the sliding frame (65)
There was also a problem that it was visible from the outside through the screen, and the appearance was extremely poor.

(E. Means for Solving the Problems) In order to solve the above-described problems, the cassette loading device of the present invention is a cassette in which a cassette is placed and which moves from a pull-in completion position to a recording medium driving unit. A sliding body having a mounting portion and a frame member surrounding the periphery of the cassette are slidably supported on the chassis separately in the cassette retraction direction, and the slide body and the frame member relatively move during the retraction operation. Thus, the shutter pressing member provided on the cassette mounting portion of the sliding member presses the shutter of the cassette to the open position.

Therefore, in the cassette loading apparatus of the present invention, the sliding body and the frame member are slidably supported on the chassis, respectively, and the sliding body and the frame member relatively move during the retraction operation, so that the cassette is loaded. Since the shutter is opened, the number of moving parts is small, and the number of parts and the number of assembling steps are reduced, thereby improving reliability and reducing costs.

Further, since the frame member and the sliding member are separately supported by the chassis, the sliding member supports the cassette mounting portion when the cassette mounting portion moves between the retracted position and the recording medium driving portion. Even if the cassette vibrates, it does not propagate to the frame member, and the part visible from the outside moves unnecessarily during movement between the cassette retracted position and the recording medium driving unit, so that it cannot be disturbed by the user. There is no pleasure.

(F. Embodiment) Hereinafter, the details of the cassette loading device of the present invention will be described with reference to the embodiment shown in the attached drawings.

Before describing the cassette loading device, a tape cassette removably attached to the cassette loading device will be described first.

(A. Tape Cassette) [FIGS. 12 to 16] Reference numeral 1 denotes a tape cassette for PCM audio.

Reference numeral 2 denotes a cassette case, which is formed by joining an upper half 3 and a lower half 4 made of synthetic resin by screwing or the like.

A pair of reel hubs 6 and 7 around which a magnetic tape 5 is wound are rotatably housed in the cassette case 2. still,
Reference numeral 8 denotes a transparent window plate provided on the upper half 3, through which the reel hubs 6 and 7 can be seen.

Reference numeral 9 denotes a front cover rotatably attached to the front end of the cassette case 2, for opening and closing the front end surface of the cassette case 2.

Reference numeral 10 denotes a shutter slidably provided on the bottom of the cassette case 2 for opening and closing the bottom of the cassette case 2. The shutter 10 includes a bottom plate 11 and short side plates 12, 12 rising upward from both left and right side edges of the bottom plate 11, and are integrally formed of a synthetic resin. Reference numerals 13, 13, ... denote guide ridges protruding from the inner surfaces of the upper edges of the side plates 12, 12 of the shutter 10, and the guide ridges 13,
Are slidably engaged with guide grooves 14 formed so as to extend in the front-rear direction between the lower half 4 and the upper half 3 of the right and left sides of the cassette case 2. ,
The shutter 10 is mounted on the cassette case 2 so as to be slidable in the front-rear direction.

Reference numerals 15 and 15 denote projecting pieces protruding upward from the front edge of the shutter 10 from positions appropriately spaced left and right.

Reference numeral 16 denotes a space for insertion of a guide member and the like formed behind the magnetic tape 5 stretched along the front opening of the cassette case 2. A concave portion 18 extending in the vertical direction is formed.

Reference numeral 19 denotes a support standing upright at a substantially central portion of the front edge of the shutter 10 in the left-right direction, and reference numeral 20 denotes an engagement portion formed at a position close to the support 19.

Numeral 21 denotes a torsion spring, the coil portion 21a of which is externally fitted to the support column 19, one short arm 21b is engaged with the engaging portion 20, and the other end of the long arm 21c is connected to the guide member. It is in elastic contact with the inner surface 17 of the equal insertion space portion 16 and urges the elastic force of the torsion spring 21 to move the shutter 10 in a direction to close the space portion 16, that is, forward.

The bottom plate 11 of the shutter 10 has two through holes 22,
When the shutter 10 is retracted, as shown by a two-dot chain line in FIG.
22 is aligned with the insertion holes 23, 23 formed in the bottom plate of the lower half 4 (hereinafter, the position of the shutter 10 in this state is referred to as “open position”), and the reel drive provided on the PCM audio tape recorder is provided. Can be inserted into the cassette case 2. still,
At this time, the column 19 enters the recess 18. Then, the shutter 10 moves forward, and as shown in FIG.
With the lower part of the shutter 16 closed, insert the shutter holes 10
The positions of the insertion holes 23 and 23 of the lower half 4 are shifted from each other, and the insertion holes 23 and 23 of the lower half 4 are
The shutter is closed at 11 (hereinafter, the position of the shutter 10 in this state is referred to as a “closed position”).

Further, shallow grooves 24, 24 extending in the front-rear direction and opening at the front edge of the bottom plate 11 are formed on the lower surface of the bottom plate 11 of the shutter 10, and the open ends of the shallow grooves 24, 24 gradually expand. It is formed to be opened. When the front cover 9 is closed, the open ends of the shallow grooves 24, 24 correspond to the notches 25, 25 formed at the lower edge of the front cover 9. The lower edge of the front cover 9 is further formed with two notches 26, 26.

Square engagement holes 27, 27 are formed at the front ends of the shallow grooves 24, 24, and similarly square engagement holes 28, 28 are formed at the rear ends of the shallow grooves 24, 24. .

Reference numerals 29, 29 denote locking pieces, which are formed in the bottom plate of the lower half 4 by forming U-shaped cut grooves 30, 30 so that the rear end is connected to the bottom plate of the lower half 4 and extends in the front-rear direction so that the front end bends. It is formed. In addition, engagement protrusions 31, 31 each having an inverted triangle shape as viewed from the side are integrally formed on the lower surfaces of the lock pieces 29, 29 at the front ends. The thickness of the lock pieces 29, 29 is made thinner than the other part of the bottom plate of the lower half 4 so that the lock pieces 29, 29 are easily bent, and furthermore, the limiters are set at predetermined heights above the front ends of the lock pieces 29, 29. The projections 32, 32 protrude from the upper half 3, so that the lock pieces 29, 29 are not bent more than necessary and broken as shown in FIG. 16 (B).

Thus, as shown in FIG. 13, when the shutter 10 is closed, the engagement projections 31, 31 at the tips of the lock pieces 29, 29 are fitted into the engagement holes 28, 28 provided in the shutter 10, The shutter 10 is locked so as not to move toward the open position. Then, in this state, the engagement projections 31, 31
Protrudes downward from the engaging holes 28, 28 but is located in the shallow grooves 24, 24.

(B. PCM audio tape recorder) [FIG. 2] Reference numeral 33 denotes a PCM audio tape recorder provided with a cassette loading device and the like to be described later. Reference numeral 34 denotes an outer casing of the recorder 33, and an outlet 35 for extracting a cassette holder is formed in a front plate 34a.

(C. Cassette mounting section) [FIG. 4] Reference numeral 36 denotes a lower chassis disposed in the outer casing 34, which is located at a height corresponding to the lower side of the outlet 35.

Reference numeral 37 denotes an opening formed at the front end of the lower chassis 36 for arranging the reel drive shaft. The opening 37 is formed in an oval shape that is long in the left-right direction.

Reference numerals 38 and 39 denote reel drive shafts supported by a reel base substrate (not shown) provided below the opening 37. At the upper end portions of these reel drive shafts 38 and 39, engagement shaft portions 38a and 39a are provided. At the same time, the engaging shafts 38a and 39a are positioned so as to protrude upward from the lower chassis 36 through the opening 37.

Reference numeral 40 denotes a head drum provided at the rear end of the lower chassis 36.

Although not shown, the lower chassis 36 is provided with a mechanism such as a tape running mechanism and a tape loading mechanism, and these constitute a magnetic tape driving unit or a cassette mounting unit as a recording medium. When the above-described tape cassette 1 is loaded by a cassette loading device described later and mounted at a predetermined position with respect to the lower chassis 36, the magnetic tape 5 is pulled out of the cassette case 2 by the tape loading mechanism, and
Various tape guide members constituting the above-described tape traveling mechanism, the head drum 40 and the like are wound around.

(D. Cassette Loading Apparatus) [FIGS. 1 to 11] Reference numeral 41 denotes a cassette loading apparatus.

(D-1. Chassis) [FIG. 4] Reference numeral 42 denotes an upper chassis, which is fixed slightly above the lower chassis 36 in the outer casing 34.

The upper chassis 42 has a rectangular shape that is long in the front-back direction,
On the rear side (note that the tape recorder 33 has its outlet
The side where 35 is located will be referred to as the front side, and the side of the tape cassette 1 where the front cover 9 is located will be referred to as the front side. A large opening 43 is formed except for approximately one third.

A guide pipe 44 is supported above the right edge of the upper chassis 42 so as to extend in the front-rear direction.

Reference numeral 45 denotes a guide block that is erected at a substantially middle portion in the front-rear direction of the left edge of the upper chassis 42, and the guide block 45 is formed of a synthetic resin having a good sliding property such as a nylon resin. A guide groove 46 extending in the front-rear direction is formed at the upper end thereof and opens toward the guide pipe 44.

Reference numerals 47, 47 denote rear support walls extending in the front-rear direction and provided at positions slightly inward of the left and right side edges of the rear portion of the upper surface of the upper chassis 42. Guide slits 48, 48 extending in the direction are formed.
The guide slits 48 are formed at the same position in the height direction.

49, 49 are front support walls that are raised from approximately half of the front side of the left and right opening edges of the opening 43 of the upper chassis 42,
Guide slits 5 extending in the front-rear direction also on the support walls 49, 49
0 and 50 are formed. These guide slits 5
0 and 50 are formed at the same position in the height direction.

(D-2. Sliding Body) [FIGS. 2, 3, 5, and 6] Reference numeral 51 denotes a sliding body, which is formed in a frame shape that is long in the front-rear direction when viewed from above.

Reference numerals 52, 52 denote support shafts projecting sideways from a position near the rear end of the sliding body 51. Rollers 53, 53 are rotatably supported by the support shafts 52, 52. 53 is rotatably engaged with the guide slits 48, 48 of the rear support walls 47, 47 described above.

Reference numerals 54, 54 denote support members 55, projecting substantially downward from both sides of the front end portion of the sliding body 51, and slightly longer support shafts projecting sideways from lower end portions of the 55. Rollers 56, 56 are rotatably supported at the tips of the
6 and 56 are guide slits 5 of the front support walls 49 and 49 described above.
It is engaged with 0 and 50 so that it can roll freely.

As described above, the slide body 51 is supported by the upper chassis slidably in the front-rear direction. The forward movement limit of the sliding body 51 is such that the rear left roller 53 is supported by the rear left support wall.
47 is defined by abutting against the front end of the guide slit 48, and the limit of the movement of the sliding body 51 to the rear is limited by the roller 56 on the front right side abutting on the rear end of the guide slit 50 of the front right support wall 49. Stipulated.

(D-3. Cassette loading section) [FIGS. 1 to 3 and FIG.
FIG. 6, FIG. 6] 57 is a cassette mounting plate, which serves as a cassette mounting portion.

The cassette mounting plate 57 has a substantially horizontally long rectangular plate shape as viewed from above, and circular insertion holes 58, 58 are formed in a portion near the rear thereof at left and right intervals.

59, 59 are insertion holes 58, 58 immediately behind the insertion holes 58, 58.
Are formed so as to extend in the front-rear direction at positions substantially corresponding to the outside of the front end 59a, 59a and rear end 59a.
b and 59b are inclined surfaces.

Notch 60 is left behind the cassette mounting plate 57, leaving both sides
Are formed, and protruding pieces 61, 61 are provided to protrude upward from the rear edge of a portion adjacent to both side ends of the notch 60.

Reference numeral 62 denotes a notch groove extending rearward from the center of the front edge of the cassette mounting plate 57 in the left-right direction and reaching a length slightly more than one third of the depth.

63, 63 are engaging pieces projecting from the front end of the cassette mounting plate 57 to the side, and engaging holes 64, 64 are formed in these engaging pieces 63, 63.

Reference numerals 65, 65 denote supported pieces that are raised upward from positions near the rear ends of both side edges of the cassette mounting plate 57.

(D-4. Cassette mounting section support mechanism) [FIGS. 2, 3,
5 and 6] Reference numeral 66 denotes a first support arm having a substantially U-shape as viewed from above, and two arm pieces 67, 67 'extending in the front-rear direction and the rear of these arm pieces 67, 67'. An intermediate piece 68 connecting the ends is integrally formed.

69, 69 are support pieces 55, 55 provided at the front end of the sliding body 51.
And a support shaft protruding inward from a position near the upper end.

Then, the arm pieces 67 and 67 'of the first support arm 66 are provided.
The portion near the rear end is rotatably supported by the bases of the support shafts 69, 69, and the front ends of the arm pieces 67, 67 'are provided at the rear end of the cassette mounting plate 57. Supported piece 6
5, 65 are rotatably connected to the upper end.

Reference numeral 70 denotes a spring hooking piece protruding sideward from a substantially middle portion in the front-rear direction of the left arm piece 67, and protruding from a position near the left edge front end of the spring hooking piece 70 and the sliding body 51. A tension spring 72 is stretched between the spring hook 71 and the spring hook 71.

Reference numerals 73, 73 denote a second support arm, which is substantially L-shaped when viewed from the side. The rear end portions of the second support arms 73 are rotatably supported by portions near the bases of lower support shafts 54 provided on the support pieces 55 of the sliding body 51. The lower end of the portion bent downward from the portion is rotatably supported by support shafts 74, 74 projecting laterally from the portion of the cassette mounting plate 57 near the lower end of the supported pieces 65, 65. ing.

As described above, the cassette mounting plate 57 can be moved vertically by the first support arm 66 and the second support arms 73 while maintaining a horizontal posture in accordance with their rotation. It is supported by the front end of the sliding body 51.

(D-5. Cassette Holder) [FIGS. 1 to 3, FIG. 5,
FIG. 6] 75 is a cassette holder, in which two arm pieces 76, 76 'extending in the front-rear direction and a connecting piece 77 connecting the rear ends of these arm pieces 76, 76' are integrally formed. It is formed to have a substantially U-shape when viewed from above.

A portion near the rear end of the arm pieces 76, 76 'is rotatably supported by the distal ends of the support shafts 69, 69.

Support shafts 78, 78 projecting outward are provided at the front ends of the arm pieces 76, 76 ', and press rollers 79, 79 are rotatably supported on the support shafts 78, 78. .

Reference numeral 80 denotes an actuated piece projecting rearward from the rear end of the left arm piece 76, and an actuated pin 81 projecting outward at the rear end of the actuated piece 80. .

Reference numeral 82 denotes a spring hooking piece projecting outward from a lower edge of a portion near the rear end of the actuated piece 80;
A tension spring 84 is stretched between the spring hooking piece 82 and the spring hooking piece 82 projecting downward from the front edge of the left side portion of the intermediate piece 68 of 66. The front ends of the two arm pieces 76 and 76 ′ of the cassette holder 75 are moved by the tensile force of the tension spring 84 to the arm pieces of the first support arm 66.
A biasing force is applied to the front ends of 67, 67 'to move downward.

(D-6. Limiter Section) [FIGS. 3 and 5] Reference numeral 85 denotes a limiter section provided at the front of the sliding body 51.

Reference numeral 86 denotes a support plate projecting rearward from the front end of the sliding body 51, and a rectangular hole 87 is formed substantially at the center of the portion near the rear end.
An arm 88 is provided to project rearward from the right end of the rear edge, and the rear end of the arm 88 is bent downward to form a spring hook piece 88a. I have.

Reference numeral 89 denotes a pressed arm, which is formed of a synthetic resin having a good sliding property such as a nylon resin. The pressed arm
The base end of 89 is rotatably supported on the left lower surface of the rear edge of the support plate 86. The distal end of the pressed arm 89 is integrally formed with a pressed portion 90 projecting backward in an arc shape, and a regulating pin 91 projecting upward is integrally formed. A regulating pin 91 is inserted into the hole 87 formed in the support plate 86. And the pressed arm
89 can rotate within a range between a position where the regulating pin 91 contacts the front edge of the hole 87 and a position where it contacts the rear edge.

Reference numeral 92 denotes a tension spring, which is stretched between the distal end of the pressed arm 89 and the spring hook 88a provided on the support plate 86. The regulating pin 91 is held in a state of being in elastic contact with the front edge of the hole 87 of the support plate 86, and in this state, most of the pressed portion 90 projects rearward from the rear edge of the support plate 86 when viewed from above. I have.

(D-7. Frame member) [FIGS. 1 to 3 and FIGS. 5 to 7
[Drawing] 93 is a frame member, which is formed of a synthetic resin.

The frame member 93 has a rectangular shape that is long in the front-rear direction when viewed from above, and has a rectangular hole 94 at the front end for inserting the tape cassette 1.

A notch 96 is formed in the upper edge of a portion of the side wall 95, 95 'of the frame member 93 which is substantially one-third of the front side of the portion located on both sides of the hole 94.
96 are formed. Also, both sides of the hole 94 and the side walls 95, 95 '
Eaves 97, 97 are formed between the upper edge and the upper edge. Further, notches 95a and 95'a are formed in portions of the lower edges of the side walls 95 and 95 'including positions corresponding to the rear portions of the holes 94.

Reference numerals 98, 98 denote projections projecting downward from portions of the eaves 97 corresponding to substantially the middle of the rear bevels of the notches 96, 96, and the inner edges 98a, 98a of the tape cassette 1 The space between the inner edges 98a and 98a is formed to be substantially the same as the width of the cassette case 2 of the tape cassette 1 in order to limit the movement to the left and right.

Reference numeral 99 denotes a rear plate protruding downward from a portion excluding the right and left ends of the rear edge of the hole 94. The rear plate 99 limits the backward movement limit of the tape cassette 1 in the cassette mounting portion. Stipulated.

Reference numeral 100 denotes a ridge protruding downward from a substantially central portion of the front edge of the hole 94. The ridge 100 defines a forward movement limit of the tape cassette 1 in the cassette mounting portion.

101, 101 are guide pieces protruding from the inner surface of the side wall 95, 95 'near the front end, the rear end thereof is located slightly forward of the ridges 98, 98, and the front end is substantially in front of the front wall 102. And spaces 102a, 102a are formed therebetween.

Guide pieces 101, 101 are rear ends 103, 1 close to eaves pieces 97, 97.
03, front end portions 104, 104 near the lower edges of the side walls 95, 95 ', and intermediate portions 105, 105 connecting these two portions and inclined forward and downward. Engagement protrusions 106 are provided on the upper surface.

Reference numeral 107 denotes a rack portion projecting from the lower rear surface of the frame member 93 near the right edge of the lower surface thereof so as to extend in the front-rear direction, and rack teeth 108, 108,. Have been.

Reference numeral 109 denotes a support shelf protrudingly provided at a substantially middle position in the vertical direction of the rear half outer surface of the right side wall 95 'so as to extend in the front-rear direction.
Is protruding. An engagement notch 111 extending in the vertical direction is formed at a position near the rear end of the ridge 110.

Reference numeral 112 denotes a bearing member formed of a synthetic resin having a good sliding property such as a nylon resin, and is fixed to the upper surface of the support shelf 109. The support pieces 113, 113 erected at the front and rear ends of the bearing member 112 are formed so that bearing holes 114, 114 are coaxial.

Reference numeral 115 denotes a guided ridge that extends in the front-rear direction and protrudes from a portion of the outer surface of the left side wall 95 slightly forward from the center in the front-rear direction to the rear end.

With the frame member 93 as described above covered with the sliding member 51, the guide pipe 44 provided on the upper chassis 42 is slidably inserted into the two bearing holes 114, 114 of the bearing member 112, and The guided ridge 115 formed on the side wall 95 of the upper chassis 42 is slidably engaged with the guide groove 46 of the guide block 45 provided on the upper chassis 42, whereby the frame member 93 is engaged with the upper chassis 42 in the front-rear direction. It is slidably supported.

The range in which the frame member 93 moves backward is the bearing member 112.
The rear support piece 113 abuts on the support piece 116 supporting the rear end of the guide pipe 44, and the forward movement range is such that the front support piece 113 of the bearing member 112 is It is limited by contacting the support piece 117 supporting the front end.

Reference numeral 118 denotes a tension spring, which is stretched between a spring hooking hole 119 formed at a position closer to the rear of a portion near the left edge of the frame member 93 and the spring hooking piece 71 of the sliding body 51. By the tension spring 118, the sliding body 51 and the frame member 93 are urged so as to be attracted to each other, and the sliding body 51 exerts a moving force to move relatively backward, and the frame member 93 relatively moves. The moving force to move forward is being urged. The tension of the tension spring 118 is set to be weaker than the tension of the tension spring 92 of the limiter 85. The base portions of the support shafts 54, 54 protruding laterally from the front support pieces 55, 55 of the slide body 51 are formed near the front portions of the side walls 95, 95 'of the frame member 93. By contacting the rear edges of the cutouts 95a and 95'a formed at the lower edge of the sliding member 51, the limit of the backward movement of the sliding member 51 relative to the frame member 93 is defined.

Accordingly, when the frame member 93 is moved rearward, the sliding body 51 connected to the frame member 93 via the tension spring 118 is also moved rearward, and the sliding body 51 is moved to the rearward movement limit. The frame member 93 can be further retracted from the point where it comes to a stop, whereby the sliding body 51 moves relative to the frame member 93 by the extension of the tension spring 118 at the end of the retraction operation. It moves slightly forward.

Then, the sliding body 51 and the frame member 93 are connected to the tension spring 118.
In the state where the cassette mounting plate 57 is pulled toward each other, the engagement pieces 63, 63 protruding from both sides of the front end of the cassette mounting plate 57 are positioned between the eaves 97, 97 and the rear ends 103, 103 of the guide pieces 101, 101. In this state, the cassette mounting plate 57 serves as the bottom plate, and the cassette mounting space 120 surrounded by the projections 98, 98, the rear plate 99, and the projection 100 of the frame member 93 is formed.

(D-8. Drive Unit) [FIGS. 4 to 6 and FIGS. 9 to 11
FIG. 121 is a cam gear rotatably supported by a support shaft 122 erected at a position slightly behind the center of the upper chassis 42, and is composed of an upper gear 123 and a lower gear 124 superimposed on each other. .

The upper gear 123 has a spur gear shape, and has gear teeth 125, 125,... Formed on the outer peripheral surface thereof. A shaft 126 protrudes upward from the center of the upper gear 123, and extends through the shaft 126 to insert the support shaft 122 therethrough.
7 are formed.

128 is a guide slit formed so as to form an arc centered on the insertion hole 127 at a position slightly closer to the center than the middle between the center and the outer peripheral portion of the upper gear 123, and the center angle is approximately 180
° is formed.

Reference numeral 129 denotes an insertion hole formed at a position close to the periphery near the clockwise end of the guide slit 128, and 130 denotes an engagement hole formed further outside the insertion hole 129. And the engagement holes 130 are arranged in a substantially radial direction.

Reference numeral 131 denotes a lock plate, which is formed in a long plate shape by a flexible synthetic resin, and a hole 132 formed in a base portion is fitted around a shaft portion 126 erected at the center of the upper gear 123. . 133 is a lock pin protruding from the lower surface of the distal end of the lock plate 131, 134 is an actuated piece projecting downward at a position slightly near the base of the lock pin 133, and the actuated piece 134 The lock pin 133 is inserted into the hole 129 and the engagement hole 130 from above. And lock pin 13
3. Both the actuated pieces 134 project downward from the lower surface of the upper gear 123, and the amount of projection is greater for the actuated pieces 134.

The lower substantially half portion 135 of the portion that protrudes downward from the lower surface of the upper gear 123 of the actuated piece 134 has an inverted triangular shape when viewed in the radial direction of the upper gear 123.

Reference numeral 136 denotes a pressing spring formed of a leaf spring material. One end of the pressing spring is fixed to the upper surface of the upper gear 123, and the other end is in elastic contact with the upper surface of the distal end of the lock plate 131.

Reference numerals 137, 137 denote pins protruding from the upper surface of the upper gear 123, which are in contact with the side edges of the lock plate 131, and define the position of the lock plate 131 so as not to rotate.

The lower gear 124 has a flat gear shape having substantially the same diameter as the upper gear 123, and has gear teeth 138, 138,. Then, the gear teeth 138, 138,.
Are smaller than the pitch at which the gear teeth 125 of the upper gear 123 are formed. A shaft 139 is projected downward from the center thereof, and an insertion hole 140 is formed through the shaft 139.

141 is a fitting hole formed near the outer periphery of the lower gear 124, and 142 is an engaging hole formed outside the fitting hole 141. The fitting hole 141 and the engaging hole 142 are
4 are formed side by side in the radial direction, and the respective distances from the center are such that the fitting hole 141 is the same as the insertion hole 129 of the upper gear 123, and the engaging hole 142 is the same as the engaging hole 130 of the upper gear 123. It has become. Therefore, when rotating one of the upper gear 123 and the lower gear 124 in a state of being overlapped so that their centers coincide with each other, the fitting hole 141 coincides with the insertion hole 129 at a certain place,
The engagement holes 142 are aligned with the engagement holes 130.

Reference numeral 143 denotes a pressing pin erected at a position substantially intermediate between the center and the outer periphery of the upper surface of the lower gear 124, and has a distance from the center equal to that of the guide slit 128 of the upper gear 123.
Then, when the upper gear 123 and the lower gear 124 are overlapped,
The pressing pin 143 of the lower gear 124 is connected to the guide slit 128 of the upper gear 123.
And is projected upward.

Then, the upper gear 123 and the lower gear 124 are superimposed,
In a state where the pressing pin 143 is located close to the clockwise end of the guide slit 128 when viewed from above, the operated piece 134 of the lock plate 131 is inserted into the insertion hole 129 and the fitting hole 141, The lock pin 133 is engaged with the engagement hole 130 and the engagement hole 142, and in this state, the upper gear 123 and the lower gear 124 rotate integrally.

Two cam grooves 144 and 145 are formed on the lower surface of the lower gear 124. These cam grooves 144, 145
Is for locking the frame member, and the inside 145 is for raising and lowering the cassette mounting plate. The details of the cam grooves 144 and 145 will be described below. However, in order to facilitate understanding in connection with the operation description to be described later, the directions will be described as viewed from above.

The outer cam groove 144 has a standby portion 144a along the outer peripheral edge, a lock portion 144b located slightly inside the standby portion 144a, and a rotating portion 14 connecting the standby portion 144a and the lock portion 144b.
4c. Both the standby portion 144a and the lock portion 144b are formed in an arc shape with a central angle of slightly less than 180 °, and the clockwise side end of the standby portion 144a and the counterclockwise side end of the lock portion 144b are turned. Linked by 144c. Also, the standby unit
The clockwise side end of 144a and the clockwise side end of lock portion 144b are located close to each other.

The engagement hole 142 opens at a position slightly closer to the clockwise direction than the center of the lock portion 144b.

The inner cam groove 145 includes a standby portion 144a, a lifting / lowering portion 145b, and a holding portion 145c that are continuous. The standby portion 145a has a center angle of approximately 200 at a position just inside the lock portion 144b of the outer cam groove 144.
°, and a counterclockwise end of the cam groove 144 corresponds to a portion of the cam groove 144 which is approximately one third in a counterclockwise direction from the clockwise end of the standby portion 144a. The clockwise end of the cam groove 144 is located at a position corresponding to a portion which is approximately one-fourth in the counterclockwise direction from the clockwise end of the lock portion 144b of the cam groove 144. .
The fitting hole 141 is opened at a position slightly counterclockwise from the clockwise end of the standby portion 145a. Therefore, the upper gear 123 and the lower gear 124 are overlapped, and the operated piece 134 of the lock plate 131 is inserted into the fitting hole 141 of the lower gear 124.
In this state, most of the lower end portion 135 of the actuated piece 134 projects into the standby portion 145a of the cam groove 145.

The elevating part 145b is formed in a range of approximately 120 ° in the central angle, and its counterclockwise side end is continuous with the clockwise side end of the standby part 145a, and the clockwise side end is close to the shaft part 139. It is in the position that I did.

The holding portion 145c has a circular arc shape having a center angle of about 40 °, and its counterclockwise side end is continuous with the clockwise side end of the elevating portion 145b.

Reference numeral 146 denotes a switch pressing piece formed to extend in an arc shape at a position near the outer peripheral edge of the lower surface of the lower gear 124.
About 50 around the position corresponding to the engagement hole 142 on the outside of 142
It is formed in an arc shape with a central angle of °.

Thus, in a state where the upper gear 123 and the lower gear 124 are overlapped, the support shaft 122 is inserted into the respective insertion holes 127 and 140, whereby the cam gear 121 is rotatably supported by the upper chassis 42. Gear teeth 12 of upper gear 123 in the state
Are engaged with the rack teeth 108, 108,... Of the rack portion 107 formed on the frame member 93. Therefore, when the upper gear 123 rotates, the gear teeth 125, 125,
, The rack teeth 108, 108,... Are sent, and the frame member 93 is moved in the front-rear direction with respect to the upper chassis 42.

Reference numeral 147 denotes a driving gear.
9 is formed integrally with a pinion 150 at the upper end, and a support shaft 151 erected on the upper chassis 42 is inserted into an insertion hole 148a penetrated through the center of the boss portion 148, thereby forming the upper chassis 42. The cam gear 121 has a pinion 150 that is rotatably supported by the gear teeth 1 of the lower gear 124 of the cam gear 121.
38, 138, ...

152 is a motor fixed to the rear lower surface of the upper chassis 42 at a position closer to the left, and a drive pulley 153 is fixed to a rotating shaft 152a protruding above the upper chassis 42,
An endless belt 154 is stretched between the drive pulley 153 and the pulley 149. Therefore, when the motor 152 rotates, the rotation is transmitted to the pulley 149 via the drive pulley 153 and the belt 154, whereby the pinion 150 is rotated, and the pinion 150 and the gear teeth 138, 138,. The lower gear 124 of the cam gear 121 is rotated.

(D-9. Frame Member Locking Mechanism) [FIGS. 2, 3, 5 to 7] Reference numeral 155 denotes a lock arm, and a position where the frame member 93 is retracted into the outer casing 34 (hereinafter, referred to as a lock arm). (Referred to as “retracted position”).

The lock arm 155 has a substantially “U” shape, and includes a first arm 156 extending in the front-rear direction and a second arm 157 extending diagonally leftward from the front end of the first arm 156. Are integrally formed, and a connecting portion between the first arm 156 and the second arm 157 is rotatably supported by a support shaft 158 erected substantially on the right side of the support shaft 122 of the cam gear 121. ing.

A lock pin 159 is provided upright at the rear end of the first arm 156, and an affected pin 160 is provided upright at the front end of the second arm 157.

When the upper end of the operated pin 160 is slidably engaged with the cam groove 144 of the lower gear 124 of the cam gear 121 and the operated pin 160 is in the standby portion 144a of the cam groove 144, When the lock pin 159 is located at a position close to the engagement notch 111 of the frame member 93 at the retracted position from the right side and the affected pin 160 is at the lock portion 144b, the lock pin 159 of the frame member 93 at the retracted position is The frame member 93 is locked at the retracted position by engaging with the engagement notch 111.

(D-10. Elevating mechanism) [FIGS. 3 to 6, 8, and 9] Reference numeral 161 denotes an elevating mechanism for elevating the cassette mounting plate 57.

Reference numeral 162 denotes a rotation lever, which is formed in a substantially "L" shape and has a bent portion rotatably supported by a support shaft 163 erected slightly left behind the support shaft 122 for the cam gear 121 of the upper chassis 42. Have been. An actuated pin 165 is provided upright at the tip of the first arm 164 extending substantially forward of the rotary lever 162, and the tip of the second arm 166 extending substantially left is provided at the tip of the first arm 164. Two projections 167, 167 slightly separated in the front-rear direction are provided upright. The upper end of the actuated pin 165 at the tip of the first arm 164 is slidably engaged with the cam groove 145 of the cam gear 121.

Reference numeral 168 denotes a rotating arm, and the main arm 169 and the sub arm 170
Consisting of

The main arm 169 has an approximately L-shape when viewed from the side, and the L-shaped bent portion is formed on the left rear support wall 47 of the upper chassis 42.
Is rotatably supported on the upper end of an arm support wall 171 erected slightly inside the front end of the arm. The first arm 172 extending in the front-rear direction has a front U-shaped engagement cutout 173 opened at the front end, and the lower end of the second arm 174 extending substantially downward. A spring hook 175 is formed at the bottom.

The sub arm 170 has an inverted triangular shape whose height is substantially low when viewed from the side, and is rotatably supported at a position near the upper end of the second arm 174 of the partial main arm 169 slightly rearward from the center. Have been. Then, a pressed pin 176 protrudes rightward from the corner located at the lower side, and the pressed pin 176 is
It is located between protrusions 167 provided at the tip of the second arm 166 of the 162. A spring hook 177 is formed at the corner located on the front side, and this spring hook 177 and the main arm 16 are formed.
A tension spring 178 is stretched between the main arm 169 and the sub arm 170 by the tension of the tension spring 178 so that the main arm 169 and the sub arm 170 are relatively rotated. The lower end of the second arm 174 is a sub arm.
The relative rotation of the two is stopped in a state of elastic contact with the rear surface of the pressed pin 176 of the 170.

Reference numeral 179 denotes a protruding piece extending rightward from the rear corner of the sub arm 170.

(E. Operation) [FIG. 1, FIG. 5, FIG. 6, FIG. 11, FIG.
Next, the operation of the cassette loading device 41 will be described.

(E-1. Insertion of Tape Cassette) First, when the motor 152 rotates in the unloading direction, the drive gear 147 rotates in the counterclockwise direction, and the cam gear 121 rotates.
The lower gear 124 is rotated clockwise. At this time, when the lock pin 133 and the operated piece 134 of the lock plate 131 are engaged with the engagement hole 142 and the engagement hole 141 of the lower gear 124, respectively, and the upper gear 123 is integrated with the lower gear 124. In addition, the upper gear 123 rotates together with the lower gear 124 in the clockwise direction.

The clockwise rotation of the upper gear 123 causes the frame member 93 to rotate.
The rack teeth 108, 108,... Of the rack portion 107 of the slide member 51 are moved forward, whereby the frame member 93 is moved forward, and the sliding member 51 and the slide member 51 connected to the frame member 93 by a tension spring 118 are provided. Cassette mounting plate supported by slide 51
57 are also moved forward, and the cassette mounting space 120 is
When the motor 152 reaches a position (hereinafter, referred to as a “projection position”) that protrudes outside from the outlet 35 of the motor 4, the motor 152 stops.

Note that the cam gear 121 is in the state shown in FIG. 5 (A).
That is, the affected pin 160 of the lock arm 155 is located at the counterclockwise end of the standby portion 144a of the cam groove 144, and the affected pin 165 of the rotating lever 162 is counterclockwise of the standby portion 145a of the cam groove 145. It is located at the peripheral end. Therefore, since the lock pin 159 of the lock arm 155 is located on the left side of the ridge 110 of the frame member 93, it does not hinder the movement of the frame member 93. Further, since the rotating lever 162 is located at the clockwise end of the rotating range, the pressed pin 176 of the rotating arm 168 is held at the rear end of the moving range by the protrusions 167, 167, As a result, the engagement notch 1 at the tip of the main arm 169
The height of 73 corresponds to the height of the operated pin 81 of the cassette presser 75.

In this manner, the tape cassette 1 is inserted into the cassette mounting space 120 and mounted on the cassette mounting plate 57 with the cassette mounting space 120 protruding out of the outer casing 34. At this time, the tape cassette 1 is inserted with the front part facing the rear side of the cassette loading device 41.

(E-2. Loading operation) (e-2-a. Retraction operation) However, when a loading command is issued, the motor 15
2 rotates in the loading direction, which causes the drive gear 1
47 rotates clockwise, so that the cam gear 121 rotates counterclockwise, and the gear teeth 125, 12 of the upper gear 123 further rotate.
.. Send the rack teeth 108, 108,... Of the frame member 93 rearward, so that the frame member 93 and the sliding body 51 are drawn into the outer casing 34 together.

When the roller 56 on the front right side of the sliding member 51 comes into contact with the rear end of the guide slit 50, the sliding member 51 cannot move further backward.
While expanding 8, only the frame member 93 moves rearward.

Therefore, the cassette mounting plate 57 supported by the sliding member 51 advances relatively to the frame member 93. And
Since the rear end face of the tape cassette 1 abuts on the ridge 100 of the frame member 93 and cannot move any further, the tape cassette 1
The cassette mounting plate 57 also moves forward, and the pressing rollers 79, 79 of the cassette pressing 75 ride on the upper surface of the tape cassette 1, and the elastic force of the tension spring 84 extended at this time. As a result, the tape cassette 1 is pressed against the cassette mounting plate 57.

Then, when the cassette mounting plate 57 further advances with respect to the frame member 93, the ridges 59, 59 of the cassette mounting plate 57 push the engaging projections 31, 31 of the tape cassette 1 upward to lock the shutter 10. Is released, and the projecting pieces 61, 61 of the cassette mounting plate 57 press the projecting pieces 15, 15 of the shutter 10, and push the shutter 10 to the open position. In this way, when the shutter 10 reaches the open position, the ridge
Since the rear ends of 59 and 59 escape to the front side of the engagement projections 31 and 31, the engagement projections 31 and 31 engage with the engagement holes 27 and 27 and the shutter 10
Lock in open position.

During the relative movement between the sliding member 51 and the frame member 93, the ridge 100 provided on the frame member 93 moves the cassette mounting plate 57.
From the center of the front edge toward the rear.

Immediately before the frame member 93 reaches the retracted position completely, the cam gear 121 is in the state shown in FIG. 5 (B). That is, the operated pin 160 of the lock arm 155 is located at the clockwise side end of the standby portion 144a of the cam groove 144, and the rotation lever 162
The actuated pin 165 is placed on substantially half of the meshing hole 141 on the counterclockwise direction.

While the frame member 93 reaches the retracted position completely from the state shown in FIG. 5B, the cam gear 121 is brought into the state shown in FIG. 5C. That is, during this time, the affected pin 160 of the lock arm 155
Reaches approximately the middle of the rotating portion 144c of the cam groove 144, whereby the lock arm 155 is slightly rotated clockwise to engage the lock pin 159 with the engagement notch 111 of the frame member 93. It becomes the state immediately before. Further, the operated pin 165 of the rotating lever 162 reaches the position on the clockwise half of the fitting hole 141, and during this time, pushes the lower half 135 of the operated piece 134 of the lock plate 131 upward. As a result, the distal end of the lock plate 131 is moved upward, and the lock pin 133 is moved.
Is disengaged upward from the engagement hole 142 of the lower gear 124.

In the state shown in FIG. 5C, since the frame member 93 has already reached the retracted position, the rack teeth 108, 10
The upper gear 123 meshing with the gear teeth 125, 125,... Cannot rotate any further counterclockwise. Accordingly, the lower gear 124, which is given a rotational force by the drive gear 147, pushes the lower half 135 of the actuated piece 134 of the lock plate 131 at the clockwise side edge of the fitting hole 141 while moving the lower gear 124 in the counterclockwise direction. , Whereby the actuated piece 134 rides on the upper surface of the lower gear 124, and thereafter, only the lower gear 124 rotates.

In the state shown in FIG. 5C, the pressing pin 143 of the lower gear 124 has reached a position close to the left side of the pressed portion 90 of the pressed arm 89 of the limiter portion 85. Then, from this state, the affected pin 165 of the rotating lever 162 is
Lower gear 1 until it reaches the clockwise end of standby section 144a
While the 24 rotates in the counterclockwise direction, the pressing pin 143
Reaches a position close to the right side of the pressed portion 90 and temporarily presses the pressed portion 90 forward during this time. Accordingly, at this time, the cassette mounting plate 57 moves further forward while extending the tension spring 118 and then returns to the retracted position. During this operation, the frame member due to manufacturing variations of the tape cassette 1 and the like. Even if the relative amount of movement between 93 and the cassette mounting plate 57 is insufficient and the shutter 10 of the tape cassette 1 has not reached the fully opened position, the movement through the limiter unit 85 The shutter 10 can be completely locked in the open position. If the cassette mounting plate 57 cannot move as much as the amount of displacement of the pressing pin 143 to the front, the extra movement is limited by the limiter unit.
Since the extension springs 92 of the 85 extend and absorb, there is no fear that the respective parts of the device will be damaged by excessive force.

Further, when this retraction operation is completed, the cassette holding
The actuated pin 81 of 75 is slidably engaged with the engagement notch 173 of the rotating arm 168, and the engagement pieces 63, 63 protruding toward the front end of the cassette mounting plate 57 are guides. The pieces 101, 101 are located from above in spaces 102a, 102a between the front ends of the pieces 101 and the front wall 102.

Further, the actuated pin 160 of the lock arm 155 is
Reaching the counterclockwise end of the lock portion 144b of the lock member 144, the lock pin 159 is engaged with the engagement notch 111 of the frame member 93, and the frame member 93 is locked at the retracted position. .

If the tape cassette 1 is inadvertently pushed downward while the front end of the cassette mounting space 120 is still outside the outer casing 34 during the above-described retraction operation, the cassette mounting plate The guide piece 10 in which 57 engagement pieces 63, 63 are provided on the frame member 93
Since the cassette mounting plate 57 comes into contact with 1, 101, it is possible to prevent the cassette mounting plate 57 from being pushed down to a height corresponding to the height in the loading completed state. Also, in the worst case, the engagement holes 64, 64 of the engagement pieces 63, 63
By engaging with the engagement protrusions 106, 106 of the front ends 104, 104 of the front end portions 104, 104, they are not pushed down below the spaces 102a, 102a. Therefore, although the pull-in operation cannot be completed as it is, it is possible to avoid the occurrence of decisive damage to the cassette mounting portion and other parts. If the retracting operation cannot be completed as in the above case, the system is configured to return to the projecting position and perform the retracting operation again. Front end of guide pieces 101, 101
104, 104, and then guided sequentially to the intermediate portions 105, 105 and returned to the original position located on the rear end portions 103, 103.

(E-2-b. Lowering operation) Next, the operated pin 165 of the rotating lever 162 is
The rotation lever 162 rotates counterclockwise while the lower gear 124 rotates counterclockwise until the lifting unit 145b moves from its counterclockwise side end to its clockwise side end. The tip of the second arm 166 moves substantially forward.

When the distal end of the second arm 166 of the rotation lever 162 moves substantially forward, the pressed pin 17 of the rotation arm 168 is moved by the rear one 167 of the projections 167 provided on the second arm 166.
6 is pushed forward, which causes the pivot arm 1
68 is rotated so that its front end, that is, the front end of the first arm 172 of the main arm 169, moves substantially upward.

When the front end of the main arm 169 moves upward, the affected pin 81 of the cassette presser 75 engaged with the engagement notch 173 provided therein is moved upward, whereby
The cassette holder 75 is rotated so that the front ends of the arm pieces 76 and 76 'move downward. Therefore, this cassette presser 75
And a first support arm 66, which is connected by a tension spring 84, is rotated so that the distal ends of the arm pieces 67, 67 'are lowered, so that the first support arm 66 is supported by the distal ends of the arm pieces 67, 67'. The loaded cassette mounting plate 57 is lowered toward the cassette mounting portion. At this time, the cassette mounting plate
The engagement pieces 63, 63 of 57 pass through the spaces 102a, 102a between the front ends of the guide pieces 101, 101 of the frame member 93 and the front wall 102.

The actuated pin 165 of the rotating lever 162 is
Shortly before reaching the clockwise end of the elevating unit 145b, the reel hubs 6 and 7 of the tape cassette 1 are inserted through the insertion holes 58 and 58 of the cassette mounting plate 57, the insertion holes 22 and 22 of the shutter 10, and the insertion holes of the cassette case 2. The engaging shaft portions 38a and 39a of the reel drive shafts 38 and 39 that have entered the cassette case 2 through 23 and 23 are engaged.

From this state, the affected pin 165 of the rotating lever 162 is
The rotation lever 162 further rotates counterclockwise until it reaches the clockwise end of the lifting unit 145b of No. 5, but since the cassette mounting plate 57 has already reached the lowering limit, the first
The main arm 169 of the arm 168 cannot rotate any more. Accordingly, only the sub arm 170 is further rotated, and as a result, the tension spring 178 is extended, and the elastic force obtained by this is transmitted to the cassette mounting plate 57 via the main arm 169, and the tape cassette 1 is removed. This is a force for pressing the cassette mounting portion including the reel drive shafts 38 and 39 and the like.

The front cover 9 of the tape cassette 1 is rotated to the open position by a cover opening member (not shown) while the tape cassette 1 is lowered from the retracted position to the cassette mounting portion.

In the lower gear 124, the affected pin 165 of the rotating lever 162 is
The holding portion 145c rotates until it reaches near the clockwise end of the holding portion 145. During this time, a switch pressing piece 146 provided on the lower surface of the lower gear 124 presses an operating piece of a switch (not shown). A completion command is issued, and the motor 152 stops.

As described above, the loading operation of the tape cassette 1 is completed. Thereafter, the magnetic tape 5 is pulled out from the cassette case 2 and wound around the head drum 40, and the tape is loaded through a predetermined tape path. .

(E-3. Unloading Operation) In the unloading operation, after the tape unloading for storing the magnetic tape 5 in the cassette case 2 is performed, the motor 152 is rotated in the unloading direction opposite to that during the loading operation. It is done by doing.

Then, the operation is performed in the reverse order of the loading operation.

First, only the lower gear 124 of the cam gear 121 rotates clockwise, and during the state from FIG. 5 (C) to FIG. 5 (B), the engagement hole 130 between the upper gear 123 and the lower gear 124 142, the insertion hole 129 and the fitting hole 141 respectively match, the lock pin 133 of the lock plate 131 engages with the engagement hole 142 of the lower gear 124, and the actuated piece 134 of the lock plate 131 Is the fitting hole 141 of the lower gear 124
Is inserted into. As a result, the upper gear 123 is rotated integrally with the lower gear 124, and the affected pin 160 of the lock arm 155 is moved from the lock portion 144b of the cam groove 144 to the standby portion 144a.
Are unlocked while the frame member 93 is moved, and its rack teeth 108, 108,... Are fed forward by the gear teeth 125, 125,. To move forward.

In the initial stage in which the frame member 93 moves forward, the tension force of the tension spring 118 is acting between the frame member 93 and the sliding member 51, so that the sliding member 51 is relatively moved with respect to the frame member 93. Retreat to Therefore, the cassette mounting plate 57 retreats relatively to the frame member 93, while the tape cassette 1 mounted thereon comes into contact with the rear plate 99 of the frame member 93 and moves further rearward. Therefore, only the cassette mounting plate 57 moves rearward with respect to the frame member 93 and the tape cassette 1, and during this time, the engagement projections 31, 31 that lock the shutter 10 at the open position. The protrusions 59, 59 of the cassette mounting plate 57 push upward to release the engagement with the engagement holes 27, 27. Accordingly, the shutter 10 is returned to the closed position by the force of the torsion spring 21.

Then, the frame member 93 and the sliding body 51 are moved to the projecting position, and the tape cassette 1 is taken out of the cassette mounting space 120 at the projecting position.

(G. Effects of the Invention) As is clear from the above description, the cassette loading device of the present invention uses a cassette in which a recording medium is stored and a slidable shutter is provided at the bottom. A cassette loading device that opens the shutter during a loading operation of loading a cassette and then loading the cassette into a recording medium driving unit, wherein the cassette is placed and moves from a pull-in completion position toward the recording medium driving unit. A sliding body provided with a cassette mounting portion and a frame member surrounding the periphery of the cassette are slidably supported on the chassis in the cassette retraction direction, and the sliding body and the frame member relatively move during the retraction operation. This allows the shutter pressing member provided on the cassette mounting portion of the sliding body to press the shutter of the cassette to the open position. And butterflies.

Therefore, in the cassette loading apparatus of the present invention, the sliding body and the frame member are slidably supported on the chassis, respectively, and the sliding body and the frame member relatively move during the retraction operation, so that the cassette is loaded. Since the shutter is opened, the number of moving parts is small, and the number of parts and the number of assembling steps are reduced, thereby improving reliability and reducing costs.

Further, since the frame member and the sliding member are separately supported by the chassis, the sliding member supports the cassette mounting portion when the cassette mounting portion moves between the retracted position and the recording medium driving portion. Even if the vibration occurs, the vibration is not transmitted to the frame member, and the part that can be seen from the outside moves unnecessarily during the movement between the cassette retracted position and the recording medium driving unit, which makes the user uncomfortable. Is not given.

[Brief description of the drawings]

1 to 11 show an embodiment of the cassette loading apparatus according to the present invention. FIG. 1 is an overall perspective view and FIG.
FIG. 3 is an overall plan view, FIG. 3 is an exploded perspective view of a main part, FIG. 4 is an exploded perspective view of another main part, FIG. 5 is a schematic plan view showing an operation, and FIG. FIG. 7 is a side view of the frame member, FIG. 8 is a perspective view of the rotating arm, FIG. 9 is an exploded perspective view of the cam gear, FIG. 10 is an enlarged sectional view of the cam gear, and FIG.
The figure is an enlarged sectional view showing the operation of the cam gear, and FIGS.
The figure shows the cassette, FIG. 12 is a perspective view, FIG. 13 is a perspective view of the cassette viewed from below, FIG. 14 is a bottom view, FIG. 15 is an exploded perspective view, and FIG. FIG. DESCRIPTION OF SYMBOLS 1 ... cassette, 5 ... recording medium, 10 ... shutter, 41 ... cassette loading device, 42 ... chassis, 51 ... sliding body,
57: cassette mounting part, 61: shutter pressing member, 93: frame member

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Tatsuyuki Daito 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Tatsuya Mototake 6-7-1 Kita-Shinagawa, Shinagawa-ku, Tokyo No. 35 Inside Sony Corporation (72) Inventor Yuji Sudo No. 423 Shimozuma, Shimotsuma City, Ibaraki Prefecture Inside Sony Tsukuba Corporation (56) References JP-A-62-289958 (JP, A) Jpn. JP, U) Japanese Utility Model Showa 63-195645 (JP, U)

Claims (1)

(57) [Claims] 1. A cassette in which a recording medium is housed and a slidable shutter is provided at the bottom. The cassette is retracted, and the shutter is retracted during a loading operation to be mounted on a recording medium drive. A cassette loading device for opening a cassette, wherein the cassette is loaded and a sliding member having a cassette loading portion which moves from a pull-in completion position toward a recording medium driving portion and a frame member surrounding the cassette are provided in a chassis. The sliding member and the frame member are relatively slidably supported in the cassette retracting direction, and the sliding member and the frame member relatively move during the retracting operation. The cassette loading device to the open position.