JP2019209606A - Printer - Google Patents

Abstract

To provide a printer easy to use.SOLUTION: A printer 100 comprises: a printing part 151; paper feeding rollers 121, 122, etc. for feeding print paper; an auxiliary roller 141 for rotating a roll 106 of the print paper; and a controller 110 for controlling the printing part 151, the paper feeding rollers 121, 122, etc., and the auxiliary roller 141.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a technology of a printing apparatus for printing characters and images on printing paper.

  2. Description of the Related Art Conventionally, printing apparatuses for printing characters and images on printing paper are known. For example, Japanese Patent Laid-Open No. 2014-94496 (Patent Document 1) discloses an address tag printing attachment device. According to Patent Document 1, a thermal paper supply unit having a drag roller that pulls out and sends thermal paper from a thermal recording roll paper, a printing unit including a thermal head and a platen roller for printing information on the thermal paper, An address tag printing supply section having a cutter unit that cuts the length into address tags, and an address tag attachment section that attaches the address tags created by the address tag print supply section to the upper surface of the bundle of newspapers being transported. In the address tag printing / attaching apparatus constituted by: a printing unit is arranged at a downstream position of the drag roller of the thermal paper supply means, and the cutter unit is arranged between the drag roller and the printing unit, and the printing The platen roller of the unit is rotated in the running direction of the thermal paper.

JP 2014-94496 A

  An object of the present invention is to provide an easy-to-use printing apparatus.

  According to an aspect of the present invention, a printing unit, a paper feed roller for conveying printing paper, an auxiliary roller for rotating a roll of printing paper, a printing unit, a paper feeding roller, and an auxiliary roller are controlled. There is provided a printing apparatus including a control unit.

  As described above, according to the present invention, an easy-to-use printing apparatus is provided.

1 is a front perspective view of a printing apparatus 100 according to a first embodiment. FIG. 2 is a front perspective view of the printing apparatus 100 in a state where the upper part of the printing apparatus 100 according to the first embodiment is lifted. 1 is a side cross-sectional image diagram illustrating an internal structure of a printing apparatus 100 according to a first embodiment. 4 is a flowchart illustrating a control process related to printing by the printing apparatus according to the first embodiment. It is a block diagram which shows the rotation mechanism of the thermal roll paper 106 which concerns on 1st Embodiment. 4 is a flowchart illustrating a control process related to paper conveyance of the printing apparatus according to the first embodiment. 10 is a flowchart illustrating a control process related to paper conveyance of the printing apparatus according to the second embodiment. It is a block diagram which shows the rotation mechanism of the thermal roll paper 106 which concerns on 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.
[First Embodiment]
<Configuration of Printing Apparatus 100>

  As shown in FIG. 1 to FIG. 3, the printing apparatus 100 according to the present embodiment pulls out the thermal paper 107 from the thermal roll paper 106 in response to an external print command, and prints characters and graphics on the thermal paper 107. Printing, determining whether printing has been performed normally, cutting the thermal paper 107 after printing into a predetermined size, or discharging the thermal paper after cutting to a predetermined area. .

  More specifically, the printing apparatus 100 includes a control board 110 for controlling each unit of the printing apparatus 100. The control board 110 is attached with a memory 112 for storing programs and various data, and a CPU 111 for controlling each part of the printing apparatus 100 according to the programs in the memory 112. In accordance with an instruction from the CPU 111, a communication interface 113 for transmitting / receiving data to / from an external device and other electrical components are also attached to the control board 110. For example, the CPU 111 receives a print command via the communication interface 113 and causes a thermal printer head described later to execute printing.

  The printing apparatus 100 includes a driving roller 141 for placing the thermal roll paper 106, a detection roller 142 for determining whether the thermal roll paper 106 is rotating, and the thermal roll paper 106. A sensor 143 for determining whether or not there is mounted. The driving roller 141 is driven by the driving force from the motor 120A.

  The CPU 111 determines whether or not the thermal roll paper 106 is placed on the driving roller 141 and the detection roller 142 in accordance with a signal from the sensor 143. Then, the CPU 111 periodically turns off the drive roller 141 and determines whether or not the detection roller 142 is driven. When the detection roller 142 is driven, the CPU 111 determines that the thermal paper 107 is drawn from the thermal roll paper 106 by a paper feed roller described later, and assists the rotation of the thermal roll paper 106. The drive roller 141 is turned on. On the other hand, when the detection roller 142 is not driven, the CPU 111 determines that the thermal paper 107 is not pulled out from the thermal roll paper 106 and turns off the drive of the drive roller 141.

  The CPU 111 conveys the thermal paper 107 by rotating the paper feed rollers 121, 122, 123, 124, 125, 126, 127, 128, and 129 in the forward direction (counterclockwise in FIG. 3). On the other hand, the CPU 111 returns the thermal paper 107 in the reverse direction by rotating the paper feed rollers 121, 122... In the reverse direction (clockwise in FIG. 3). More specifically, opposed rollers 122B, 124B, 125B, 126B, 127B, 128B, and 129B are arranged at opposing positions on the paper feed rollers 122, 124, 125, 126, 127, 128, and 129, and these rollers are provided. By sandwiching the thermal paper 107, the thermal paper 107 can be conveyed in the forward direction or the reverse direction.

  In the present embodiment, the paper feed rollers 122, 124, 125, 126, 127, 128, 129 and the opposing rollers 122 B, 124 B, 125 B, 126 B, 127 B, 128 B, 129 B are arranged in the left-right direction of the printing apparatus 100. A plurality of them are provided side by side.

  The printing apparatus 100 includes a thermal printer head 151. The CPU 111 controls the thermal printer head 151 to print characters and figures on the conveyed thermal paper 107.

  In the printing apparatus 100, the image sensor 162 is disposed downstream of the thermal printer head 151 in the conveyance direction of the thermal paper 107. The image sensor 162 captures the surface (printing surface) of the thermal paper 107 after printing, and provides the captured image to the CPU 111. As a result, the CPU 111 compares the image data delivered to the thermal printer head 151 stored in the memory 112 with the actually printed image data to determine whether printing has been executed normally. Can do. For example, the CPU 111 determines that printing has been executed normally when the matching rate of two images is equal to or greater than a predetermined value.

  The printing apparatus 100 is equipped with a cutting unit 165. The cutting unit 165 cuts the printed thermal paper 107 into a predetermined size based on an instruction from the CPU 111.

  More specifically, in the present embodiment, a reference position image for indicating a cutting position of the thermal paper 107 is printed on the back surface of the thermal paper 107, that is, the front surface not printed by the thermal printer head 151. . On the other hand, a cut position detection sensor 164 is disposed upstream of the cutting unit 165 in the conveyance direction of the thermal paper. The CPU 111 causes the cutting unit 165 to cut the thermal paper 107 when the reference position image is detected according to the signal from the cut position detection sensor 164 while rotating the paper feed rollers 121, 122.

  In the present embodiment, the back surface of the thermal paper 107 is white, and the reference position image is a black rectangular image printed on both left and right ends of the back surface of the thermal paper 107. The reference position image may be printed on either the left or right end of the back surface of the thermal paper 107, or a notch or the like indicating the reference position may be formed on the thermal paper 107. Based on signals from the cut position detection sensor 164 and a print position detection sensor 161 described later, the CPU 111 detects the black area for a predetermined time after detecting the white area while photographing the back surface of the conveyed thermal paper 107. When the white area is detected again, it is determined that the reference position image has been detected. The method for detecting the reference position of the thermal paper 107 is not limited to the image sensor, and a method using an optical reflection sensor, a proximity sensor, or the like can be used instead.

  The printing apparatus 100 includes a discharge course switching unit 167. The discharge course switching unit 167 switches the discharge area of the thermal paper 107 after cutting in accordance with an instruction from the CPU 111. In the present embodiment, the printing apparatus 100 is provided with at least a first discharge unit 131 that is used during normal printing and a second discharge unit 132 that is used in an emergency.

  More specifically, in this embodiment, the CPU 111 compares the image data passed to the thermal printer head 151 with the actually printed image data and determines that the printing has been executed normally. , The paper feed rollers 121, 122... Are rotated forward so that the cutting unit 165 cuts the printed thermal paper 107 into a predetermined size based on a signal from the cut position detection sensor 164. The CPU 111 discharges the heat-sensitive paper 107 after cutting to the normal first discharge unit 131 by setting the discharge course switching unit 167 to the normal position.

  On the other hand, if the CPU 111 cannot compare the image data passed to the thermal printer head 151 with the actually printed image data and cannot determine that printing has been executed normally, the paper feed rollers 121, 122. .., By rotating the thermal paper 107 in the reverse direction, causing the thermal printer head 151 to print a predetermined image. The predetermined image indicates that the thermal paper 107 is invalid. Then, the CPU 111 cuts the printed thermal paper 107 into a predetermined size by the cutting unit 165 based on the signal from the cut position detection sensor 164 while rotating the paper feed rollers 121, 122. Let The CPU 111 discharges the thermal paper 107 after being cut to the emergency second discharge unit 132 by setting the discharge course switching unit 167 to another position.

  In the printing apparatus 100 according to the present embodiment, the CPU 111 executes the following process when performing test printing on the thermal paper 107. That is, when the CPU 111 receives a test print command via the communication interface 113, the CPU 111 causes the thermal printer head 151 to print a predetermined test image while rotating the paper feed rollers 121, 122. . When the CPU 111 detects the reference position image according to the signal from the cut position detection sensor 164 while rotating the paper feed rollers 121, 122,. Let Also in this case, the CPU 111 sets the discharge course switching unit 167 to another position, thereby discharging the cut thermal paper 107 to the emergency second discharge unit 132.

  Further, in the printing apparatus 100 according to the present embodiment, a printing position detection sensor 161 is disposed upstream of the printing position of the thermal printer head 151 in the conveying direction of the thermal paper 107. As will be described later, the CPU 111 rotates the paper feed rollers 121, 122,... In response to a signal from the print position detection sensor 161 every time printing is completed, the print result is confirmed, and the thermal paper is cut. Thus, the thermal paper 107 is rewound in the direction of the thermal roll paper 106 to the place where the reference position image is detected.

  More specifically, as will be described later, the CPU 111 performs a paper feed roller every time the thermal paper 107 is cut or in order to perform invalid printing after photographing and checking the surface (printing surface) of the thermal paper 107 after printing. 121, 122... Are rotated in the reverse direction, and the thermal paper 107 is conveyed in the reverse direction to a place where the print position detection sensor 161 detects the reference position image on the back side of the thermal paper 107. Alternatively, as will be described later, the CPU 111 cuts the thermal paper 107, or in order to perform invalid printing after photographing and checking the surface (printing surface) of the thermal paper 107 after printing, the paper feed rollers 121 and 122. Are rotated in the reverse direction, and the printing position detection sensor 161 conveys the thermal sheet 107 in the reverse direction until the leading edge of the thermal sheet 107 reaches the detection position of the printing position detection sensor 161.

  Then, when executing the next printing, the CPU 111 causes the thermal printer head 151 to start printing characters and figures when the reference position image is detected according to a signal from the print position detection sensor 161.

In the present embodiment, the distance between the position of the thermal printer head 151 and the position of the print position detection sensor 161 is designed to be about 1 mm to 2 cm, preferably about 2 mm to 1 cm. Alternatively, the distance between the printing position by the thermal printer head 151 and the detection position by the printing position detection sensor 161 in the conveyance path of the thermal paper 107 is designed to be about 1 mm to 2 cm, preferably about 2 mm to 1 cm. Thus, when the reference position image on the back surface of the thermal paper 107 is detected, the CPU 111 starts printing by the thermal printer head 151 from an area about 1 mm to 2 cm ahead of the image.
<Control Processing Related to Printing of Printing Apparatus 100>

  Next, main control processing for the printing apparatus 100 according to the present embodiment will be described. FIG. 4 is a flowchart illustrating main control processing according to the printing apparatus 100 according to the present embodiment.

  When the CPU 111 receives a print instruction, the CPU 111 executes a process as shown in FIG. First, the CPU 111 drives the paper feed rollers 121, 122... To drive the thermal paper 107 in the forward direction by driving the motors 120A, 120B. The CPU 111 searches for the reference position image on the back surface of the thermal paper 107 based on the signal from the print position detection sensor 161 (step S102).

  When detecting the reference position image, the CPU 111 causes the thermal printer head 151 to print characters, graphics, and the like on the cover of the thermal paper 107 (step S104). The CPU 111 drives the paper feed rollers 121, 122, etc. to further convey the printed thermal paper 107 in the forward direction, and causes the image sensor 162 to photograph the surface of the thermal paper 107 (step S106). The CPU 111 determines whether or not the image data captured this time is the same as the print image data transferred to the thermal printer head 151 (step S108). For example, if the captured image and the print image match 95% or more, the CPU 111 determines that printing has ended normally (step S108).

  When it is determined that printing has been normally completed (YES in step S108), the CPU 111 drives the paper feed rollers 121, 122, and so on to further convey the thermal paper 107 in the forward direction. Based on the signal from the cut position detection sensor 164, the reference position image on the back surface of the thermal paper 107 is searched (step S110). When detecting the reference position image, the CPU 111 cuts the thermal paper 107 by the cutting unit 165 (step S112). The CPU 111 further conveys the thermal paper 107 cut to a predetermined size in the forward direction and discharges it to the normal first discharge unit 131 (step S114).

  The CPU 111 drives the paper feed rollers 121, 122... By driving the motors 120A, 120B, and conveys the remaining thermal paper 107 in the reverse direction (step S116). Based on the signal from the print position detection sensor 161, the CPU 111 searches for the reference position image on the back side of the thermal paper 107 (step S118). When detecting the reference position image, the CPU 111 determines that the print standby position has been reached, and stops the conveyance of the thermal paper 107 (step S120). The CPU 111 waits for the next print command.

  On the other hand, if it is determined that printing has not been completed normally (NO in step S108), the CPU 111 drives the motors 120A, 120B to move the paper feed rollers 121, 122. Driven to transport the thermal paper 107 in the reverse direction (step S122). Based on the signal from the print position detection sensor 161, the CPU 111 searches for the reference position image on the back side of the thermal paper 107 (step S124).

  When the CPU 111 detects the reference position image, the thermal printer head 151 drives the paper feed rollers 121, 122,... Or a graphic is printed (step S126). The CPU 111 conveys the thermal paper 107 in the forward direction and searches for a reference position image on the back surface of the thermal paper 107 based on a signal from the cut position detection sensor 164 (step S128). When detecting the reference position image, the CPU 111 cuts the thermal paper 107 by the cutting unit 165 (step S130). The CPU 111 further transports the thermal sheet 107 after printing and cutting in the forward direction and discharges it to the second discharge unit 132 (step S132). At this time, it is preferable that the CPU 111 notifies other devices via the communication interface 113 of information indicating that an abnormality has occurred.

The CPU 111 drives the paper feed rollers 121 and 122 by driving the motors 120A and 120B, and conveys the remaining thermal paper 107 in the reverse direction (step S116). The CPU 111 searches for the reference position image on the back surface of the thermal paper 107 based on the signal from the print position detection sensor 161 (step S118). When detecting the reference position image, the CPU 111 determines that the print standby position has been reached, and stops the conveyance of the thermal paper 107 (step S120). The CPU 111 waits for the next print command.
<Control processing for transporting thermal paper in the forward direction>

  Next, as in step S <b> 104 in FIG. 4, control when the thermal sheet 107 is conveyed in the forward direction during printing by the printing apparatus 100 according to the present embodiment will be described. In this embodiment, the CPU 111 of the control board 110 determines whether or not the thermal paper 107 is slack when driving the paper feed rollers 121, 122... In the forward direction. When the thermal paper 107 from the thermal roll paper 106 to the paper feed rollers 121, 122... Is slackened, the thermal paper 107 is conveyed in the forward direction only by the paper feed rollers 121, 122. If the slack is not slack, the thermal roll paper 106 is rotated not only by the paper feed rollers 121, 122.

  Specifically, in the printing apparatus 100 according to the present embodiment, as illustrated in FIG. 5, the CPU 111 detects that the detection roller 142 is in a normal state in a state where the clutch 145 is turned off and the driving roller 141 is in the idling state. In the case of rotating in the direction, the clutch 145 is turned on to rotate the driving roller 141 in the forward direction. Conversely, the CPU 111 turns off the clutch 145 and does not drive the drive roller 141 when the detection roller 142 is not rotating in a state where the clutch 145 is turned off and the drive roller 141 is idling.

  More specifically, as shown in FIG. 6, when the CPU 111 receives a print command, the CPU 111 executes the following process. That is, the CPU 111 turns off the clutch 145 and cuts off the transmission of the driving force from the motors 120A and 120B to the driving roller 141 (step S204). The CPU 111 determines whether or not the detection roller 142 is rotating (step S206).

  If the detection roller 142 is not rotating (NO in step S206), the CPU 111 keeps the clutch 145 OFF until the detection roller 142 starts to rotate.

  If detection roller 142 is rotating (YES in step S206), CPU 111 rotates drive roller 141 (step S212). The CPU 111 determines whether printing has been completed and the thermal paper 107 has been transported to the cutting position (step S214). When thermal sheet 107 is conveyed to the cutting position (NO in step S214), CPU 111 stops drive motors 120A and 120B (step S216) and waits for the next printing.

In this embodiment, as shown in step S116 in FIG. 4, when the thermal paper 107 after printing by the printing apparatus 100 is transported in the reverse direction, the CPU 111 uses the paper feed rollers 121, 122. Drive in the opposite direction. At this time, a slack is generated in the thermal paper 107 between the first roller 121 and the thermal roll paper 106. In this embodiment, the sag is eliminated by the configuration shown in FIG. 5 and the process shown in FIG. 6, and when the sag is eliminated, the driving roller 141 assists the rotation of the thermal roll paper 106. The conveyance of 107 is easy to be stabilized and the reliability is improved.
[Second Embodiment]

  In the above embodiment, the clutch 145 for transmitting the driving force to the driving roller 141 is turned off every time printing is started. However, the CPU 111 determines that the degree of sag is small after rotating the driving roller 141 once, and does not confirm the predetermined number of times of printing, for example, 10 times by the detection roller 142 at the time of printing. The driving roller 141 may be automatically driven.

  More specifically, as shown in FIG. 7, when the CPU 111 receives a print command, the CPU 111 executes the following process. That is, the CPU 111 determines whether or not the number of times of printing has reached a predetermined number since the drive roller 141 was driven last time (step S202). If the predetermined number of times has been reached since the previous driving roller 141 was driven (YES in step S202), the degree of sagging may have increased, so the CPU 111 turns off the clutch 145. Then, the transmission of the driving force from the motors 120A and 120B to the driving roller 141 is cut off (step S204). The CPU 111 determines whether or not the detection roller 142 is rotating (step S206).

  If the detection roller 142 is not rotating (NO in step S206), the CPU 111 keeps the clutch 145 OFF until the detection roller 142 starts to rotate.

If detection roller 142 is rotating (YES in step S206), CPU 111 resets the number of printings and starts counting the number of printings again (step S210). The CPU 111 rotates the drive roller 141 (step S212). The CPU 111 determines whether printing has been completed and the thermal paper 107 has been transported to the cutting position (step S214). When thermal sheet 107 is conveyed to the cutting position (NO in step S214), CPU 111 stops drive motors 120A and 120B (step S216) and waits for the next printing.
[Third Embodiment]

  In step S116 in FIG. 4, that is, after printing, when the thermal paper 107 is transported in the reverse direction, the CPU 111 drives the paper feed rollers 121, 122. The roll paper 106 may be rotated in the reverse direction, the clockwise direction in FIG. That is, the CPU 111 may reversely rotate the driving roller 141 or the detection roller 142 by driving the motors 120A and 120B.

More specifically, as shown in FIG. 8, when the paper feed rollers 121, 122... Are driven in the reverse direction, the thermal roller paper 106 is moved in the reverse direction. A one-way clutch 146 that can freely rotate in the clockwise direction in FIG. The CPU 111 rotates the drive roller 141 or the detection roller 142 in reverse by driving the motors 120A and 120B at the same timing as the reverse rotation of the paper feed rollers 121, 122. As a result, even if the motors 120A and 120B are stopped, the thermal roll paper 106, the drive roller 141, and the detection roller 142 continue to reversely rotate as they are due to the inertial force, and the drive roller 141 and the detection are detected at the timing when the thermal paper 107 is pulled. The roller 142 stops. The one-way clutch 146 prevents the thermal roll paper 106 from rotating in the forward direction, that is, the thermal paper 107 is less likely to sag.
[Fourth Embodiment]

In the above embodiment, it is detected that the thermal paper 107 is slack based on whether or not the detection roller 142 is rotating. However, other methods may be used to detect that the thermal paper 107 is slack. For example, the proximity sensor or other detection sensor detects that the thermal paper 107 is located at a position off the path from the thermal roll paper 106 to the paper feed roller 121, and the thermal paper 107 is sagging. It may be detected.
[Fifth Embodiment]

  In the above embodiment, when the thermal paper 107 is slack, the drive roller 141 is driven to assist the conveyance of the thermal paper 107 by the paper feed rollers 121, 122. It was. However, the conveyance of the thermal paper 107 by the paper feed rollers 121, 122... May be assisted by other methods.

  For example, the drive motor 120A, 120B may be a DC motor, and the current value may be measured to detect the torque.

Alternatively, the CPU 111 may drive the drive roller 141 when it is detected that a force greater than a predetermined value is applied to the paper feed rollers 121, 122.
[Sixth Embodiment]

In the above embodiment, the thermal printing apparatus 100 has been described. However, the above technique can be applied to printing apparatuses other than the thermal printing apparatus.
[Summary]

  In the above embodiment, the printing unit 151, the paper feed rollers 121, 122... For conveying the printing paper, the auxiliary roller 141 for rotating the printing paper roll 106, and the printing unit 151. Are provided with a control unit 110 for controlling the paper feed rollers 121, 122,... And the auxiliary roller 141.

  Preferably, the control unit 110 drives the auxiliary roller 141 when it is determined that the printing paper roll 106 is rotated by the paper feed rollers 121, 122.

  Preferably, the control unit 110 drives the auxiliary roller 141 when it is determined that there is no sagging of the printing paper between the printing paper roll 106 and the paper feed rollers 121, 122.

  Preferably, the printing apparatus 100 further includes a detection roller 142 that contacts the roll 106 of printing paper. The control unit 110 drives the auxiliary roller 141 when the detection roller 142 rotates when the auxiliary roller 141 is not driven.

  Preferably, the control unit 110 determines whether to drive the auxiliary roller 141 by turning off the driving of the auxiliary roller 141 at a predetermined timing.

  Preferably, the control unit 110 rewinds the printing paper via the auxiliary roller 141 after printing by the printing unit 151.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

100: Printing device 106: Thermal roll paper 107: Thermal paper 110: Control board 111: CPU
112: Memory 113: Communication interface 120A: Drive motor 120B: Drive motor 121: Paper feed roller 122: Paper feed roller 122B: Opposite roller 123: Paper feed roller 124: Paper feed roller 124B: Opposite roller 125: Paper feed roller 125B: Opposing roller 126: Paper feeding roller 126B: Opposing roller 127: Paper feeding roller 127B: Opposing roller 128: Paper feeding roller 128B: Opposing roller 129: Paper feeding roller 129B: Opposing roller 131: First discharge section 132: Second Discharge unit 141: Drive roller 142: Detection roller 143: Sensor 145: Clutch 146: One-way clutch 151: Thermal printer head 161: Print position detection sensor 162: Image sensor 164: Cut position detection sensor 165: Cross-sectional unit 167: Emissions course switching unit

Claims (6)

A printing section;
A paper feed roller for conveying printing paper;
An auxiliary roller for rotating the roll of printing paper;
A printing apparatus comprising: a control unit for controlling the printing unit, the paper feed roller, and the auxiliary roller.   The printing apparatus according to claim 1, wherein the control unit drives the auxiliary roller when determining that the roll of the printing paper is rotated by the paper feed roller.   The printing apparatus according to claim 1, wherein the control unit drives the auxiliary roller when it is determined that there is no sagging of the printing paper from the printing paper roll to the paper feeding roller. A detection roller that contacts the roll of the printing paper;
4. The printing apparatus according to claim 1, wherein the control unit drives the auxiliary roller when the detection roller rotates when the auxiliary roller is not driven. 5.   The printing apparatus according to claim 4, wherein the control unit determines whether to drive the auxiliary roller by turning off the driving of the auxiliary roller at a predetermined timing.   The printing apparatus according to claim 1, wherein the control unit rewinds the printing paper via the auxiliary roller after printing by the printing unit.

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