JP2004306377A - Printing apparatus control method and printing apparatus - Google Patents

Abstract

The present invention relates to a control of a printing apparatus capable of performing appropriate printing without terminating a conveyance process until a carriage reaches a recording start position of a next line and improving a throughput of the printing process. It is an object to provide a method and a printing device.
One line is formed by selectively driving a print head facing a print area of an object to be printed in a main scan in which a carriage on which the print head is mounted is moved in a main scan direction. After the printing operation of the print head for printing one line is completed, the feeding operation of feeding the printing object to the next line in the sub-scanning direction is alternately repeated, so that the printing area of the printing object is A printing method for printing on the print head, the feed operation preceding the main scan is not completed immediately before the print head reaches the print area by the main scan, The printing drive is canceled.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a control method and a printing apparatus for a printing apparatus that performs printing on a printing target while moving a carriage on which a print head is mounted in a main scanning direction and sending the printing target in a sub-scanning direction.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a printing apparatus such as an ink-jet printer, a carriage on which a recording head (print head) is mounted is subjected to one main scan to record an image for one line on a recording material (printing target), and one line (1 After the recording of (line) is completed, the recording material is conveyed in a sub-scanning direction perpendicular to the main scanning direction by a predetermined amount (until the next line). Images are recorded.
[0003]
In such a recording apparatus, when the conveyance processing of the recording material and the recording operation of the recording head are performed in an overlapped manner, a printing failure occurs, so that the conveyance processing is performed until the carriage reaches the recording start position of the next line. A carriage motor for moving the carriage and an LF (line feed) motor for transporting the recording material are controlled so as to end (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-9-95023 (pages 2 to 6, FIG. 8)
[0005]
[Problems to be solved by the invention]
By the way, it is known that a motor (especially a commutator motor) used in the above-described recording apparatus decreases in rotational speed of the motor when a load applied to the motor increases (overload occurs). For this reason, if the load on the carriage motor and the LF motor of the printing apparatus fluctuates, if the carriage attempts to end the transport process before reaching the print start position of the next line, the printing time increases. Problems arise.
[0006]
For example, in the case of a carriage motor, the movement speed of the carriage increases as the load applied to the motor decreases. Therefore, the carriage movement timing at which the stop time of the carriage is the longest is determined in accordance with the minimum load applied to the motor. For this reason, when the load on the motor is not the minimum load amount, there is a problem that the recording time is prolonged due to the decrease in the moving speed of the carriage in addition to the long stopping time of the carriage. In the case of the LF motor, if the longest recording material transport processing time when the maximum load (overload) is applied to the motor is not assumed, the transport process ends when the motor is overloaded. Before the printing, the carriage reaches the recording start position of the next line and printing is started. Therefore, assuming that the LF motor is overloaded, the carriage is moved based on the longest transport processing time, and much time is required for recording.
[0007]
Therefore, the present invention provides a control method of a printing apparatus that can perform appropriate printing without ending the conveyance process until the carriage reaches the recording start position of the next line, and can improve the throughput of the printing process. And a printing device.
[0008]
[Means for Solving the Problems]
The present invention provides one-line printing performed by selectively driving a print head facing a print area of a print target in a main scan in which a carriage on which a print head is mounted is moved in a main scan direction; After the printing drive of the print head for printing one line is completed, the feeding operation of sending the printing target in the sub-scanning direction to the next line is alternately repeated, thereby printing in the printing area of the printing target. A control method of an apparatus, wherein immediately before a print head reaches a print area by a main scan, a printing operation of the print head in the main scan is canceled if a feed operation preceding the main scan is not completed. It is characterized by doing.
[0009]
Further, the present invention provides a one-line printing performed by selectively driving a print head facing a print area of a print target in a main scan in which a carriage on which a print head is mounted is moved in a main scan direction. After the printing drive of the print head for printing one line is completed, the feeding operation of feeding the printing target in the sub-scanning direction to the next line is alternately repeated, so that the printing target prints in the printing area. A printing apparatus for printing, a carriage control motor for causing a main scan of a carriage, a feed control motor for performing a feed operation, a position recognition unit for recognizing a position of a print head with respect to a printing target, Control means for detecting whether the control motor is being driven or not, and control means for controlling the print head and the detection means based on the position recognition means; Immediately before the print head reaches the print area by main scanning, detection by the detecting unit is performed for each main scanning, and when it is detected that the feed operation preceding the main scanning is not completed, the main scanning is performed. The printing drive of the print head in the scanning is canceled.
[0010]
According to this configuration, immediately before the print head reaches the print area by the main scan, if it is detected that the feed operation preceding the main scan has not been completed, the printing of the print head in the main scan is performed. Since the driving is canceled, the printing driving is not started during the feeding operation. Therefore, if the feeding operation is not completed before the carriage reaches the print area of the next line, the print driving is not performed, and the deterioration of the print quality can be prevented.
[0011]
In this case, it is preferable that each feeding operation is started with the end of the printing drive of the print head as a trigger.
[0012]
Further, in this case, it is preferable that the apparatus further includes a motor control unit that controls the feed control motor, and the motor control unit starts driving the feed control motor with an end of print driving of the print head as a trigger.
[0013]
According to this configuration, the feeding operation is started with the end of the printing drive of the print head as a trigger, so that printing can be performed efficiently. That is, by starting the feeding operation together with the stop of the driving of the print head, the feeding operation can be performed by effectively utilizing the time until the print head reaches the printing start position of the next line. Can be reduced as much as possible.
[0014]
In these cases, it is preferable that the printing object is wound in a roll shape so as to be fed out by the feeding operation.
[0015]
According to this configuration, it is possible to perform appropriate printing on the print target without depending on the roll diameter of the wound print target. For example, when the roll diameter is large, the load applied to the feed control motor becomes large (overload is applied), so that the time required for the feed operation is prolonged, and the print head reaches the print start position of the next line. In some cases, the feed operation may not be completed, but in such a case, the print drive is canceled, and thus, it is possible to prevent improper printing from being performed by performing the print drive during the feed operation. it can.
[0016]
In these cases, the print head is formed of an inkjet head that discharges ink, and further includes an ink tank that stores ink to be supplied to the print head, and the ink tank is preferably provided on a carriage. .
[0017]
According to this configuration, the amount of ink stored in the ink tank decreases with the printing drive of the print head, and even if the movement speed of the carriage varies, the carriage reaches the print area of the next line even if it varies. If the feeding operation is not completed, it is possible to perform appropriate printing without performing printing drive.
[0018]
In these cases, it is preferable that the detection means is constituted by a rotary encoder that detects the rotation amount of the feed control motor.
[0019]
According to this configuration, the rotary encoder detects the rotation amount of the feed control motor that is correlated with the feed amount of the print target by the feed operation, and thus determines whether the feed control motor is being driven with a simple configuration. Can be detected.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a printer (printing apparatus) according to an embodiment of the present invention will be described with reference to the accompanying drawings. The printer 1 is connected to a host computer such as a personal computer, and prints on roll paper P1 or cut sheet P2 to be printed based on print data transferred from the host computer.
[0021]
FIG. 1 is an external perspective view of the entire printer according to the present embodiment, and FIG. 2 is an external perspective view of the printer with an open / close lid opened and an upper case removed. As shown in both figures, the outer periphery of the printer 1 is constituted by a cover case 4 composed of an upper case 2 and a lower case 3, and an opening / closing lid 5 provided at the rear of the upper surface of the printer 1. A storage pocket 6 for storing the roll paper P1 is provided inside the opening / closing lid 5, and a roll paper discharge port 7 for discharging the printed roll paper P1 is provided at the center of the upper surface of the printer 1. Is formed. A cut sheet insertion slot 8 for inserting cut sheets P2 is formed at the front of the printer 1, and a printed cut sheet P2 is discharged in front of the roll sheet discharge port 7. A cut sheet discharge port 9 is formed.
[0022]
As shown in FIGS. 1 to 4, the printer 1 has, as a basic configuration, a printing unit 11 for printing on a printing target, which includes a print head 22 (described later), and a printing target. Sending means 12 for feeding an object (roll paper and cut sheet) along a predetermined feeding path 10; ink supply means 13 having an ink cartridge (not shown) for supplying ink to a print head 22; And a control unit 15 for controlling the entire printer 1 by controlling the respective units while associating them with each other.
[0023]
The printer 1 (control means 15 of the printer) drives the printing means 11 to eject ink droplets from the print head 22 to the printing target, and appropriately sends the printing target along the predetermined feed path 10 by the sending means 12. By sending it out, printing is performed on the printing target. When the printing target is the roll paper P1, after the printed portion of the roll paper P1 is sent out, the cutting unit 14 is driven to cut the roll paper P1 at a predetermined position. .
[0024]
First, the printing unit 11 and the sending unit 12, which are main parts of the present invention, will be described. The printing unit 11 includes a head unit 21 on which a print head 22 is mounted, and a head moving mechanism 31 that moves the head unit 21 in the main scanning direction, that is, in the X-axis direction. The head unit 21 includes a print head 22 and a carriage 23 on which the print head 22 is mounted.
[0025]
The print head 22 faces the feed path 10 of the printing target, and ejects ink droplets to the printing target sent along the feed path 10, and supplies ink from an ink cartridge (described later) of the ink supply unit 13. And a head main body for discharging the supplied ink. Although not shown, the head main body is composed of a nozzle plate having a large number of ejection nozzles and a pump unit. In the print head 22, the ink droplets are ejected from the ejection nozzles by the action of the pump unit.
[0026]
The carriage 23 has a mounting opening (not shown) for positioning and fixing the print head 22, and holds the print head 22 so that the head body protrudes. The base of the carriage 23 is fixed to a part of an endless timing belt 32 (described later). Although not shown, an ink cartridge is detachably mounted on the carriage 23, and the ink cartridge moves together with the print head 22. Note that the printer 1 of the present embodiment is a color printer, and the ink cartridge is filled with a total of four colors of ink of yellow (Y), magenta (M), cyan (C), and black. Further, the ink cartridge does not necessarily have to be mounted on the carriage 23, and may have a fixed configuration.
[0027]
The head moving mechanism 31 includes a timing belt 32 stretched between a right driving pulley (not shown) and a left driven pulley (not shown), a guide rod 33 for guiding the movement of the carriage 23, and the carriage 23. A carriage motor 34 (carriage control motor) for movement. The drive pulley is connected to a carriage motor 34, and the print head 22 mounted on the carriage 23 reciprocates right and left via the timing belt 32 when the carriage motor 34 rotates forward and backward. . Further, an X-axis linear encoder 35 (position confirmation means) is provided in parallel with the timing belt 32 so that the moving position of the carriage moving in the main scanning direction can be accurately grasped. I have. Although not shown, the X-axis linear encoder 35 includes a linear scale extending in parallel with the timing belt 32 and a photo sensor mounted on the carriage 23.
[0028]
Here, a series of operations of the printing unit 11 will be described. The printing unit 11 drives the carriage motor 34 to detect the print area by the X-axis linear encoder 35 while driving the carriage 23 forward, and drives the print head 22 to discharge, thereby printing one line on the print target. Perform printing. After the printing of one line is completed, the driving of the carriage motor 34 is stopped. After the carriage motor 34 is stopped for a predetermined time, the carriage motor 34 is re-driven to move the carriage 23 backward, and the print area is detected by the X-axis linear encoder 35 in the same manner as when the carriage 23 moves forward. By driving the nozzle 22 to discharge, one line of printing is further performed. When printing of one line is completed, the carriage motor 34 is stopped again for a predetermined time. The printing unit prints one line at a time by repeating these operations.
[0029]
As shown in FIG. 3, the guide rod 33 supports the carriage 23 so that the nozzle plate of the print head 22 and the feed path 10 facing the print head 22 are parallel. A platen 36 (guide plate) is disposed in the feed path 10 at a position close to and opposed to the nozzle plate of the print head 22 in parallel with the main scanning direction. An appropriate printing is performed on the printing object by pressing the back surface of the object.
[0030]
The sending unit 12 sends the print target in the sub-scanning direction (Y-axis direction) orthogonal to the main scanning direction along the feeding path 10. The feeding means 12 feeds out the roll paper P1 stored in the storage pocket 6, and feeds the fed roll paper P1 to the roll paper discharge port 7 along the feed path 10; A cut sheet feed mechanism 42 for feeding the cut sheet P2 inserted from the opening 8 along the feed path 10 to the cut sheet discharge port 9, and a drive source for the roll sheet feed mechanism 41 and the cut sheet feed mechanism 42. A drive motor 43 (feed control motor) and a power transmission mechanism (not shown) for selectively and deceleratingly transmitting the power of the drive motor 43 to the roll paper feed mechanism 41 and the cut-sheet paper feed mechanism 42 are provided. ing.
[0031]
The roll paper feed mechanism 41 feeds the roll paper P1 fed by the roll paper feed unit 51 to feed out the roll paper P1 stored in the storage pocket 6 and the roll paper P1 fed by the roll paper feed unit 51 along the feed path 10. And a roll paper discharge unit 55 that sends the paper to the paper discharge port 7. The roll paper feed unit 51 has a paper feed roller 52 for feeding out the roll paper P1. The paper feed roller 52 is composed of grip rollers facing each other across the roll paper P1, and includes a paper feed drive roller 53 connected to a drive motor 43, and a paper feed driven roller urged by the paper feed drive roller 53. It consists of 54. The roll paper discharge section 55 has a discharge roller 56 for discharging the fed roll paper P1. Similarly to the paper feed roller 52, the paper discharge roller 56 is formed of a grip roller, and is connected to the drive motor 43, a paper discharge drive roller 57, a paper discharge driven roller 58 urged by the paper discharge drive roller 57, and have.
[0032]
The cut sheet feed mechanism 42 has a cut sheet feed roller 61 for feeding the inserted cut sheet P2 along the feed path 10. The cut sheet feed roller 61 is also provided with the above-described sheet feed roller. Like the reference numeral 52, it is constituted by a grip roller, and includes a driving roller 62 connected to a driving motor 43 and a driven roller 63 urged to press the driving roller 62. The drive motor 43 is constituted by a DC servo motor capable of rotating forward and reverse, and a rotary encoder 65 (a slit disk and a photo interrupter facing the slit disk) which detects the rotation of the drive motor 43 is provided at the shaft end of the output shaft. Is fixed. The feed amount of the print target is defined by the rotation amount of the drive motor 43, and the drive amount of the print target can be controlled by controlling the drive of the drive motor 43 based on the rotary encoder 65. . Although the details will be described later, the drive motor 43 is controlled in synchronization with the printing unit 11, and when printing of one line is completed by the printing unit 11, the drive motor 43 is driven to print to the printing position of the next line. The object is sent.
[0033]
Although not shown, the power transmission mechanism transmits power to the roll paper feed mechanism 41 and the cut-sheet paper feed mechanism 42 via a gear train that transmits the power of the drive motor 43 at a reduced speed. Further, a clutch mechanism is incorporated in the gear train. For example, when the drive motor 43 rotates forward, power is transmitted to the roll paper feed mechanism 41, and when the drive motor 43 rotates reversely, power is transmitted to the cut-sheet paper feed mechanism 42. As described above, the power is selectively transmitted to the roll paper feed mechanism 41 or the cut-sheet paper feed mechanism 42 using the forward / reverse rotation of the drive motor 43.
[0034]
Next, the main control system of the printer 1 will be described. As shown in FIG. 4, the printer 1 has a printer interface 71, and inputs print data (image data and print control data) and various commands transmitted from a host computer, and sends various data inside the printer 1 to the host. A data input / output unit 72 for outputting to a computer, a detection unit 73 having the above-described X-axis linear encoder 35 and rotary encoder 65 and performing various types of detection, and a printing unit having a print head 22 and performing printing 74, a transport unit 75 that has the carriage motor 34 and the drive motor 43 and moves the carriage 23 and feeds a print target, a drive unit 76 that has various drivers for driving each unit, and is connected to these units. A control unit 77 that controls the entire printer 1.
[0035]
The control unit 77 includes a CPU 78, a ROM 79, a RAM 80, and a peripheral control circuit (P-CON) 81, which are connected to each other by an internal bus 82. The ROM 79 has a control program area for storing a control program to be processed by the CPU 78 and a control data area for storing control data including a color conversion table and a character modification table. The RAM 80 has an image data area for storing externally input image data, a print image data area for storing image data for printing, a color conversion buffer area corresponding to each color, and various register groups. Used as a work area for
[0036]
In the P-CON 81, a logic circuit for supplementing the function of the CPU 78 and handling an interface signal with a peripheral circuit, which is constituted by a gate array, a custom LSI, or the like, is incorporated. That is, the P-CON 81 takes the print data and various detection signals from the host computer and various parts of the printer 1 as they are or processes them and takes them into the internal bus 82, and outputs the data from the CPU 78 or the like to the internal bus 82 in conjunction with the CPU 78. The output data and control signal are output to each section of the printer 1. The P-CON 81 incorporates a timer 83 for performing time control.
[0037]
The CPU 78 inputs various detection signals, various commands, various data, and the like via the P-CON 81 according to the control program in the ROM 79, processes various data and the like in the RAM 80, and then drives the driving unit 76 via the P-CON 81. To output a control signal. As described above, the control unit 77 controls each unit of the printer 1 and controls the entire printer 1.
[0038]
Based on the above, a series of operations of the printing process in the printer 1 will be described. As described above, the printing unit 11 is configured to print one line at a time while reciprocating the carriage 23, and the control unit 15 (the control unit 77) synchronizes with the printing unit 11 and sends the By driving the drive motor 43, the printing is controlled so that appropriate printing is performed.
[0039]
FIG. 5A is a diagram showing the relationship between the carriage speed and the position of the carriage when the carriage 23 reciprocates between the moving area points AB. FIG. 5B shows the relationship between the carriage 23 and the moving area point AB. FIG. 6 is a diagram showing a relationship between carriage speed and time when the carriage reciprocates. Referring to FIG. 3, when the carriage 23 moves from the point A to the point B, the control means 15 accelerates the carriage 23 starting from the point A until the speed 23 reaches the speed v, After the high speed movement, the carriage motor 34 is controlled so that the carriage 23 decelerates and stops at the point B. When the carriage 23 is moved backward, the carriage 23 is accelerated from the point B until the speed v is reached, moved at a constant speed at the speed v, and then decelerated and stopped at the point A. Is drive-controlled.
[0040]
Further, a printing area is shown between the points CD shown in the figure, and the control unit 15 drives the ejection of the print head 22 based on the movement position of the carriage 23 detected by the X-axis linear encoder 35. Specifically, when the carriage 23 moves forward, the ejection drive of the print head 22 is started with the point C as the print start position, and the ejection drive of the print head 22 is stopped (end) with the point D as the print end position. One line is printed, and when the carriage 23 moves backward, the ejection drive of the print head 22 is started with the point D as the print start position, and the ejection drive of the print head 22 is stopped with the point C as the print end position. The line is being printed.
[0041]
On the other hand, the feeding operation of the printing target by the sending unit 12 is started at the same time as the ejection driving of the print head 22 is stopped, and the control unit 15 drives the printing head 22 in accordance with the reciprocation of the carriage 23. The drive of the drive motor 43 is started with the stop (the drive end of the print head 22 due to the end of printing of one line) as a trigger. Then, when the feed amount of the print target reaches a predetermined amount and the print target is sent to the printing position of the next line, the drive motor 43 is stopped based on the rotary encoder 65 so as to stop driving the drive motor 43. Is controlled.
[0042]
By the way, the stop time of the carriage 23 during the printing process, that is, the time from the end of the forward movement of the carriage 23 to the start of the backward movement and the time from the end of the backward movement of the carriage 23 to the start of the forward movement. The time is set so that the driving of the driving motor 43 and the ejection driving of the print head 22 are not performed simultaneously, that is, the printing is performed before the ejection driving of the printing head 22 for printing the next line is performed. It is experimentally determined and set in advance so that the object feeding operation is completed. This is because if the driving of the driving motor 43 and the ejection driving of the print head 22 are performed at the same time, a printing failure occurs. The stop time of the carriage 23 set experimentally is stored in the RAM 80 of the control unit 77 in advance, and the control unit 15 controls the carriage motor 34 based on this.
[0043]
The carriage motor 34 and the drive motor 43 have variations in the performance of the applied motors themselves, so that the movement time of the carriage 23 and the time required for the feeding operation of the printing target vary. Further, since the motor rotation speed during acceleration / deceleration changes according to the load applied to the motor (acceleration of the carriage 23 changes), when the load applied to the motor changes, the moving time of the carriage 23 and the time required for the feed operation also increase. Will change. Therefore, in order to surely prevent the printing failure, the carriage motor 34 is assumed to be the motor with the fastest rise, and the drive motor 43 is assumed to be the motor with the slowest rise. It is necessary to consider the case where the load of the motor 43 is maximum. However, in such a case, the stop time of the carriage 23 becomes the longest, and there is a problem that the printing time becomes long.
[0044]
Therefore, in the printer 1 of the present embodiment, by checking whether the feed operation by the drive motor 43 is performed immediately before the ejection drive of the print head 22 is performed for one-line printing, the carriage 23 is moved. Even if the stop time is not maximized, printing can be appropriately performed, and the printing time as a whole can be reduced.
[0045]
The case in which the carriage 23 moves forward will be specifically described as an example. As shown in FIG. 5, when the X-axis linear encoder 35 detects that the carriage 23 has reached the point C ′ immediately before reaching the point C which is the print start position, the control unit 15 uses the rotary encoder 65 to print the object to be printed. Check the amount of goods sent. At this time, if the feed amount of the printing target has not reached the predetermined amount, the control unit 15 determines that the feed operation by the drive motor 43 is being performed, and discharges the print head 22 in the movement. Is canceled so that printing between the print area points CD is not performed. Note that the rotary encoder 65 and the control unit 15 constitute a detection unit described in claims.
[0046]
After stopping the carriage 23 at the point B for a predetermined time, the carriage 23 starts to return. Then, at a point D ′ immediately before reaching the point D which is the printing start position at the time of the backward movement, the feed amount of the print target is confirmed again by the rotary encoder 65, and the feed amount of the print target reaches the predetermined amount, If it is determined that the feed operation by the drive motor 43 has been completed, the ejection driving of the print head 22 is started from the point D. In the printing at the time of the backward movement, the ejection driving is canceled at the time of the forward movement, and the print data that has not been printed is printed.
[0047]
In the forward movement, when the feed amount of the print target has reached a predetermined amount, the ejection drive of the print head 22 is started from the point C, and printing of one line is performed.
[0048]
In this manner, every time the carriage 23 is moved, the end of the feeding operation is confirmed immediately before the printing start position, so that the printing target can be printed before the ejection driving of the print head 22 for printing the next line is performed. Even if the feeding operation of the object is not completed, the feeding operation and the ejection driving of the print head 22 are not performed at the same time, so that a printing failure can be prevented. That is, the stop time of the carriage 23 does not need to be maximized, and the stop time of the carriage 23 can be set so that the printing time as a whole is minimized.
[0049]
In the present embodiment, the carriage motor 34 and the drive motor 43 are constituted by DC servo motors, but both need not necessarily be constituted by DC servo motors, and only one of them is constituted by DC servo motors. You may. For example, one of the carriage motor 34 and the drive motor 43 may be constituted by a stepping motor. Further, a configuration may be adopted in which only the load applied to the drive motor 43 changes without mounting the ink cartridge on the carriage 23. Further, it is also possible to eliminate the ink cartridge and to configure the print head 22 by a thermal head.
[0050]
【The invention's effect】
As described above, in the printing apparatus control method and the printing apparatus of the present invention, immediately before the print head reaches the print area by main scanning, if the feeding operation preceding the main scanning is not completed, Since the print drive of the print head in the main scanning is canceled, the feed operation and the print drive of the print head are not performed at the same time, and printing failure does not occur. For this reason, it is not necessary to reliably terminate the feeding operation until the print head reaches the print area, and the carriage stop time is set so that the overall print time is minimized, and the overall print time is reduced. It is possible to shorten it.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a printer according to an embodiment.
FIG. 2 is an external perspective view of the printer with an open / close lid opened and an upper case removed. It is a right side view.
FIG. 3 is a sectional view of the printer.
FIG. 4 is a block diagram illustrating a control system of the printer.
FIG. 5A is a diagram showing a relationship between the carriage speed and the position of the carriage when the carriage reciprocates between moving area points AB, and FIG. 5B is a diagram showing the movement timing of the carriage; FIG. 5 is a diagram illustrating a timing of a feed operation by a drive motor.
[Explanation of symbols]
Reference Signs List 1 printer 15 control means 22 print head 23 carriage 34 carriage motor 35 X-axis linear encoder 43 drive motor 65 rotary encoder 73 detector 83 timer P1 roll paper

Claims (7)

In the main scanning in which the carriage on which the print head is mounted is moved in the main scanning direction, one-line printing performed by selectively driving the print head facing a print area of the printing target, and the one line After the printing drive of the print head for printing is completed, the feeding operation of sending the printing target in the sub-scanning direction to the next line is alternately repeated, thereby printing in the printing area of the printing target. A method of controlling a printing apparatus,
Immediately before the print head reaches the print area by the main scan, if the feed operation preceding the main scan is not completed, cancel the print drive of the print head in the main scan. A method of controlling a printing apparatus, which is characterized by the following. The method according to claim 1, wherein each of the feeding operations is started by triggering an end of the print driving of the print head as a trigger. In the main scanning in which the carriage on which the print head is mounted is moved in the main scanning direction, one-line printing performed by selectively driving the print head facing a print area of the printing target, and the one line After the printing drive of the print head for printing is completed, the feeding operation of sending the printing target in the sub-scanning direction to the next line is alternately repeated, thereby printing in the printing area of the printing target. Printing device,
A carriage control motor for main-scanning the carriage,
A feed control motor for performing the feed operation,
Position recognition means for recognizing the position of the print head with respect to the print target,
Detecting means for detecting whether or not the feed control motor is being driven;
Control means for controlling the print head and the detection means based on the position recognition means,
Immediately before the print head reaches the print area by the main scan, the control unit performs detection by the detection unit for each main scan, and the feed operation preceding the main scan is not completed. A printing apparatus for canceling the printing drive of the print head in the main scanning when the detection is detected. Further comprising a motor control means for controlling the feed control motor,
4. The printing apparatus according to claim 3, wherein the motor control unit starts driving of the feed control motor with an end of print driving of the print head as a trigger. 5. The printing apparatus according to claim 3, wherein the printing target is wound in a roll shape so as to be fed out by the feeding operation. The print head is configured by an inkjet head that discharges ink,
Further comprising an ink tank for storing ink to be supplied to the print head,
The printing apparatus according to claim 3, wherein the ink tank is provided on the carriage. 7. The printing apparatus according to claim 3, wherein the detection unit includes a rotary encoder that detects a rotation amount of the feed control motor.

Images