JP3780303B2 - Printer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small printer such as an electronic cash register used in a POS (Point Of Sale) system, for example, and in particular, a separation in which a print head and a platen roller constituting a printing mechanism are separated into a printer main body and a cover. The present invention relates to a technique for facilitating an operation of opening a cover in a mold.
[0002]
[Prior art]
Many printers of the electronic cash register employ a thermal printing method in which a thermal print head is pressed against paper (thermal paper) for printing. Structurally, a cover for opening and closing the paper storage section is hinged to a printer main body having a paper storage section for storing roll-shaped paper, the print head is connected to the printer main body, and the platen roller is a rotating end of the cover. Separately, a printing mechanism separation type provided in each of the sections is widely used. In this separation type, the sheet pulled out from the sheet storage unit is sandwiched between the print head and the platen roller by closing the cover, and in this state, printing by the print head and sheet feeding to the outside of the apparatus by the platen roller are performed. The print head is accompanied by a pressing spring that presses the print head toward the platen roller and presses the print head against the sheet, and generates a friction force for conveying the sheet by the platen roller. The platen roller is engaged with the print head by the press contact force of the print head by the pressing spring, so that the closed state of the cover is maintained.
[0003]
[Problems to be solved by the invention]
The separation type printer has a structure in which the cover can be opened by releasing the engagement of the platen roller with respect to the print head. In conventional printers, the platen roller is disengaged from the print head by a hop-up mechanism that opens when the cover is rotated directly or when the lever is pressed. . However, in any case, since a force against the pressing spring that presses the print head is required, the operation is complicated, and there is a possibility that a load is applied to the cover and other parts to damage the apparatus. Furthermore, when a hop-up mechanism is incorporated, problems such as an increase in the number of parts and a decrease in the degree of freedom in design occur.
[0004]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a printer capable of improving the operability when opening a cover by facilitating the operation of releasing the engagement of the platen roller with respect to the print head in the separation type printer configured as described above. .
[0005]
[Means for Solving the Problems]
  The present invention provides a printer main body having a paper storage portion and a print head, a cover hinged to the printer main body so as to be able to close the paper storage portion so as to be openable and closable, and rotatably provided on the cover. A platen roller disposed opposite to the print head, a platen roller driving means provided on the printer main body or cover for rotating the platen roller forward and reverse, and provided on at least one of the printer main body and the cover. And a pressing means for pressing the print head and the platen roller in a relatively approaching direction so that they are pressed against each other, thereby holding the cover closed, and the cover is closed. The paper fed from the paper storage unit is sandwiched between the print head and the platen roller, and the platen roller While normal rotation, line and conveying the printing and paper to the paper by the print headThe platen roller receives a reaction force from the print head during both forward rotation and reverse rotation.In the printerControl means for controlling forward / reverse rotation of the platen roller by the platen roller driving means, and a cover open switch that is operated when the cover is opened and supplies an ON signal for opening the cover to the control means. When the ON signal is supplied from the cover open switch, the platen roller driving means is operated to reverse the platen roller.By receiving a reaction force directed in the opening direction of the cover during reverse rotationPlaten rollerIt is characterized in that the engagement with the print head is released.
[0006]
The basic operation of the printer of the present invention is to sandwich the paper drawn out from the paper storage unit by closing the cover between the print head and the platen roller, and in that state, print by the print head and feed the paper by forward rotation of the platen roller. Do. By the pressing means, the print head comes into pressure contact with the paper and a friction force for conveying the paper by the platen roller is generated. Further, the platen roller is engaged with the print head, and the cover is kept closed.
[0007]
  Now, according to the present invention, the cover can be easily opened by reversing the platen roller. That is, when opening the cover,Set the cover open switch to ON,The platen roller is reversely rotated by the platen roller driving means. Then, the platen roller receives a reaction force directed from the print head in the opening direction of the cover, whereby the cover operates in the opening direction against the pressure contact force by the pressing means, and the engagement of the platen roller with the print head is released. The Thereafter, the cover can be opened manually by rotating the cover. In order to close the cover, the cover is pushed against the pressing force from the print head by the pressing means, and the platen roller is engaged with the print head.
[0008]
  Thus, according to the present invention, since the platen roller can be released from the print head by reversing the platen roller, the operation is facilitated, and the operability when opening the cover is improved. It is done. Since the platen roller is rotated forward / reversely by the platen roller driving means, the control means for causing the platen roller driving means to perform the operation and the reverse rotation are performed.Cover open switchBy providing, this invention can be implemented suitably.In addition, in order to allow the cover to be forcibly opened even when the printer is in operation, when the ON signal is supplied from the cover open switch to the control means, After the operation is stopped and then the print data is discarded, the platen roller can be reversed to open the cover.
[0009]
In the present invention, when the platen roller is rotating forward, the platen roller receives a reaction force directed to the cover closing direction from the print head. Therefore, the closed state of the cover is strongly maintained during the conveyance of the sheet, and problems such as inadvertent opening of the cover do not occur.
[0010]
In the present invention, at least one of the printer main body and the cover is preferably provided with an urging means for urging the cover in the opening direction. When this configuration is adopted, the releasing operation of the platen roller with respect to the print head, which is performed by reversing the platen roller, is assisted by the urging means. For this reason, the releasing operation is performed smoothly. Further, the urging force of the pressing means for engaging the platen roller with the print head can be strengthened to make the cover closed more reliably. The urging force of the urging means is set to such an extent that the platen roller is not detached from the print head by the urging force and the engaged state can be reliably maintained.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(1) First embodiment
A. Printer configuration
1 and 2 are right side views showing the entire printer according to the first embodiment of the present invention. This printer is a small printer used as an electronic cash register, and includes a printer main body 10 and a cover 20. FIG. 1 shows a state where the cover 20 is engaged and closed with the printer main body 10, and FIG. 2 shows a state where the cover 20 is slightly opened by disengaging the cover 20 from the printer main body 10. The printer employs a thermal printing method, and the printing mechanism is a separation type in which a printer head 10 is provided with a print head (thermal head) 30 and a cover 20 is provided with a platen roller 40.
[0012]
The printer main body 10 has a box-shaped frame 11 as a main body, and a paper storage portion 12 is provided inside the frame 11 by left and right side plates 11 a and a holder 11 b constituting the frame 11. The paper storage unit 12 stores thermal paper S accumulated in a roll shape. The sheet S is stored such that the leading end is pulled out from the lower side to the front side (left side in FIGS. 1 and 2). The cover 20 is hingedly connected to the upper portion of the rear portion of the frame 11 via a hinge shaft 21, and is thereby attached to the frame 11 so as to be opened and closed so as to close the paper storage unit 12.
[0013]
A print head 30 extending in the lateral direction (the back and front directions of the drawings in FIGS. 1 and 2) is fixed to the front end portion of the frame 11 with the print surface facing rearward and slightly upward. The print head 30 is always urged rearwardly as indicated by an arrow A by a pressing spring (pressing means) 31 attached to the frame 11.
[0014]
The left and right side plates 11a of the frame 11 are provided with auxiliary springs (biasing means) 13 that urge the cover 20 in the opening direction (indicated by an arrow B). The auxiliary spring 13 is in a compressed state when the cover 20 is closed, and functions to assist the opening operation of the cover 20 by repelling when the cover 20 is opened.
[0015]
The cover 20 is formed by integrally forming a top plate 20 a covering the paper storage unit 12 from above and left and right side plates 20 b depending from the top plate 20 a, and each side plate 20 b is hinged to the frame 11 via a hinge shaft 21. Are combined. A platen roller 40 extending in the lateral direction is rotatably supported at the front end of each side plate 20b. The platen roller 40 is made of an elastic body, and both ends of a shaft 41 that rotates integrally with the platen roller 40 protrude outward from the side plates 20b. A driven gear 50 is fixed to the protruding end from the right side plate (shown in FIGS. 1 and 2) 20 b of the shaft 41. The driven gear 50 has a pinion 52 of a platen drive motor (platen roller drive means: not shown in FIGS. 1 and 2 and indicated by reference numeral 55 in FIG. 3) fixed to the cover 20 via a reduction gear 51. It is connected. When the rotation of the pinion 52 of the platen drive motor 55 is transmitted through the reduction gear 51 and the driven gear 50, the platen roller 40 rotates forward or backward (indicated by arrows C and D in FIG. 1 respectively). The sheet S is pulled out of the roll unit and conveyed when the platen roller 40 is rotated forward, and is discharged out of the apparatus.
[0016]
When the cover 20 is closed, the platen roller 40 comes into contact with the print head 30, and when the cover 20 is further closed, the platen roller 40 contacts and opposes the printing surface of the print head 30 while rolling. When the cover 20 is closed, the pressure spring 31 resists the pressure contact force from the print head 30, and the print head 30 is pressed against the platen roller 40 by the pressure spring 31. In this state, the platen roller 40 is engaged with the print head 30 so that the closed state of the cover 20 is maintained. The urging force that the auxiliary spring 13 urges the cover 20 in the opening direction is set to such an extent that the platen roller 40 is not detached from the print head 30 by the urging force and the engagement state can be reliably maintained.
[0017]
When actually using the printer, the cover 20 is opened, the paper S is passed between the print head 30 and the platen roller 40, the cover 20 is closed, and the paper S is moved between the print head 30 and the platen roller 40. Put in between. Even in this use state, the closed state of the cover 20 due to the platen roller 40 being in pressure contact with the print head 30 is maintained. The print head 30 is pressed against the front surface of the paper S by the pressing spring 31. Further, when the platen roller 40 pressed against the back surface of the paper S is rotated forward, the paper S is conveyed upward by frictional force. Yes.
[0018]
When the print head 30 pressed by the pressing spring 31 comes into pressure contact with the platen roller 40, the platen roller 40 receives a reaction force from the print head 30 in both cases of normal rotation and reverse rotation. The reaction force during forward rotation is directed in the direction in which the cover 20 is closed, and the reaction force during reverse rotation is directed in the direction in which the cover 20 is opened. When the platen roller 40 receives a reaction force generated at the time of reverse rotation, the platen roller 40 rolls upward against the pressure contact force of the print head 30 by the pressing spring 31, and accordingly, the cover 20 operates in the opening direction. Then, the platen roller 40 is disengaged from the print head 30 and the engagement is released.
[0019]
Although not shown in FIGS. 1 and 2, a cutter for cutting the paper S (reference numeral 56 in FIG. 3) is provided downstream of the print mechanism (print head 30 and platen roller 40) in the paper transport path, that is, above the print mechanism. Is shown). The cutter 56 includes a fixed blade provided in the printer main body 10 and a movable blade provided at the rotating end of the cover 20. When the cover 20 is closed, the movable blade is fixed with the paper S interposed therebetween. Opposite the blade. The sheet is cut when the movable blade reciprocates in the fixed blade direction.
[0020]
The above is the mechanical configuration of the printer. Next, the configuration of the control system will be described with reference to the control block diagram shown in FIG. The printer controls the printer operation (printing, paper conveyance and paper cutting) and the opening operation of the cover 20 by a control unit 60 including a CPU 60a, an interface 60b, a ROM 60c and a RAM 60d which are microcontrollers incorporating various peripheral functions. Is done. The interface 60 b is an input / output unit for the host computer 61. The ROM 60c stores control programs and fixed data, and the RAM 60d stores print data and the like as necessary. These interface 60b, ROM 60c and RAM 60d are connected to the CPU 60a. The CPU 60a performs various controls according to programs stored in the ROM 60c.
[0021]
The CPU 60 a supplies a thermal signal based on the print data to the print head 30, and further supplies an operation signal to the platen drive motor 55 and the cutter 56. Further, the printer main body 10 is provided with a display unit 57 for displaying input / output data, errors, and the like, and a cover open switch 58 used when opening the cover 20, and the CPU 60 a supplies a display signal to the display unit 57. Further, the ON signal of the cover open switch 58 is supplied to the CPU 60a.
[0022]
B. Basic operation of the printer
Next, the basic operation of the printer having the above configuration will be described.
The cover 20 is opened, and the paper S is passed between the print head 30 and the platen roller 40 and between the fixed blade and the movable blade of the cutter 56, and then the cover 20 is closed, and the paper S is moved between the print head 30 and the platen roller 40. Between them. The cover 20 is held in a closed state by the platen roller 40 being brought into pressure contact with the print head 30 and being engaged therewith. The print head 30 is pressed against the front surface of the paper S by the pressing spring 31, and the platen roller 40 is pressed against the back surface of the paper S. When a print command is supplied from the host computer 61 to the CPU 60a, printing is performed by the print head 30. Printing is performed by repeating one-line printing and sheet conveyance for one line by forward rotation of the platen roller 40 (rotation in the direction of arrow C in FIG. 1) based on the print data. When printing of the contents of the print command is completed, the paper of a predetermined length is discharged by the platen roller 40, and thereafter, the paper S is cut by the cutter 56.
[0023]
C. Opening the cover
Next, the operation when opening the cover 20 will be described with reference to the flowchart of FIG. When opening the cover 20, the operator turns on the cover open switch 58. In step S1, the CPU 60a determines whether or not the ON signal of the cover open switch 58 is supplied. When the cover open switch 58 is turned ON (Yes), the process proceeds to the next step S2. In step S2, it is determined whether the printer is operating. In this case, the operation of the printer means printing by the print head 30, paper conveyance by the platen roller 40, and paper cutting by the cutter 56. If the printer is not operating (No), the process proceeds to step S3, where a reverse rotation signal is supplied to the platen drive motor 55, and the platen roller 40 reverses by a predetermined angle (rotates in the direction of arrow D in FIGS. 1 and 2). If the printer is operating (Yes), the process returns to step S2.
[0024]
When the platen roller 40 reverses, the platen roller 40 receives a reaction force directed from the print head 30 in the direction in which the cover 20 opens. Then, the platen roller 40 rolls upward against the pressure contact force of the print head 30 by the pressing spring 31 and the cover 20 operates in the opening direction, so that the platen roller 40 is moved from the print head 30 as shown in FIG. Come off. This operation is assisted by the auxiliary spring 13 that urges the cover 20 in the opening direction. When the engagement of the platen roller 40 with the print head 30 is released in this manner, the operator can manually rotate the cover 20 to open the cover 20. In order to close the cover 20, the cover 20 is pushed manually against the pressure contact force from the print head 30 by the pressing spring 31, and the platen roller 40 is engaged with the print head 30.
[0025]
FIG. 4 shows an operation example in which the cover 20 cannot be opened when the printer is operating. As shown in FIG. 5, there is a control mode in which the cover 20 can be forcibly opened even when the printer is operating. It can also be adopted. In this case, if it is determined in step S2 that the printer is operating (Yes), the process proceeds to step S4, and the operation of the printer is stopped. Next, after the print data is discarded in step S5, the process proceeds to step S3 where the cover 20 is opened by the reverse rotation of the platen roller 40.
[0026]
According to the first embodiment, the platen roller 40 can be easily disengaged from the print head 30 by reversing the platen roller 40. Therefore, the complicated operation of manually opening the cover 20 as in the prior art is eliminated, and the operability when opening the cover 20 is improved. Moreover, since the operation of opening the cover 20 can be performed without applying a load to the cover 20 and other parts, there is no possibility of damaging the apparatus. Furthermore, since the cover open switch 58 can be cited as a new part, a significant increase in the number of parts can be suppressed, and the loss of design freedom can be avoided.
[0027]
Further, when the platen roller 40 is rotating forward for paper conveyance, the platen roller 40 receives a reaction force directed in the closing direction of the cover 20 from the print head 30. Therefore, the closed state of the cover 20 is strongly held during the conveyance of the sheet, and problems such as the cover 20 being inadvertently opened do not occur. In addition, since the opening operation of the cover 20 is controlled by the control unit 60, for example, the trouble that the cutter 56 is damaged due to the opening of the cover 20 during the operation of the cutter 56 does not occur.
[0028]
Further, the operation of removing the platen roller 40 from the print head 30 is assisted by the auxiliary spring 13, so that the operation is smoothly performed. Further, the presence of the auxiliary spring 13 makes it possible to increase the biasing force of the pressing spring 31 that engages the platen roller 40 with the print head 30 to make the cover 20 closed more reliably.
[0029]
Next, a second embodiment and a third embodiment of the present invention will be described. In the drawings to be referred to, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0030]
(2) Second embodiment
A second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, the drive system of the platen roller 40 is changed, and a platen drive motor (not shown) is fixed to the rear portion (right side in FIG. 6) of the frame 11 of the printer body 10. A gear train including a plurality of intermediate gears connecting the reduction gear 51 and the pinion 52 of the platen drive motor is rotatably supported on the outer surface side of the frame 11 and the cover 20. In this case, one intermediate gear 70a that meshes with the pinion 52 is disposed on the side plate 11a of the frame 11, and the six intermediate gears 70b, 70c, 70d, 70e, 70f, 70 g are arranged.
[0031]
Of the intermediate gears 70 b to 70 g on the cover 20 side, the rotation shaft of the most downstream, that is, the rearmost intermediate gear 70 b is arranged coaxially with the hinge shaft 21 of the cover 20. For this reason, even if the intermediate gear 70a on the printer body 10 side and the intermediate gear 70b on the cover 20 side mesh with each other, the rotation of the cover 20 is not restricted. The rotation of the pinion 52 of the platen drive motor is transmitted to the platen roller 40 through the intermediate gears 70b to 70g, the reduction gear 51, and the driven gear 50, whereby the platen roller 40 is rotated in the forward direction indicated by the arrow C or in the reverse direction indicated by the arrow D. Rotate in the direction.
[0032]
Also in the second embodiment, similarly to the first embodiment, the platen roller 40 is detached from the print head 30 by reversing the platen roller 40, and the cover 20 can be opened. According to the second embodiment, since the relatively heavy platen drive motor is fixed to the frame 11 of the printer main body 10, the total weight of the cover 20 is reduced, and as a result, the opening operation of the cover 20 is smoother. There is an advantage of becoming. Although the platen drive motor is disposed on the printer main body 10 side separated from the cover 20, the drive force of the platen drive motor always passes through the intermediate gears 70 a to 70 g, the reduction gear 51, the driven gear 50, and the platen roller. 40. Therefore, the platen roller 40 can be reversed until the platen roller 40 is detached from the print head 30. As a result, the engagement of the platen roller 40 is reliably released.
[0033]
(3) Third embodiment
Next, a third embodiment of the present invention will be described with reference to FIGS.
In the third embodiment, the drive system of the platen roller 40 is also changed, and a platen drive motor (not shown) is fixed to the front portion (left side in FIGS. 7 to 9) of the frame 11 of the printer body 10. The pinion 52 of the platen drive motor and the driven gear 50 fixed to the platen roller 40 are the intermediate gear 80 and the reduction gear 51 that are rotatably supported by the side plate 11a of the frame 11 with the cover 20 closed. Connected by That is, when the cover 20 is closed, the driven gear 50 meshes with the reduction gear 51.
[0034]
An arm 90 extending forward is supported by the reduction gear 51 so as to be swingable. The arm 90 is bent at the tip end upward, the bent portion is engaged with the first planetary gear 91 meshed with the reduction gear 51, and the tip portion is meshed with the first planetary gear 91, and the arm When the 90 swings upward, the second planetary gear 92 that meshes with the driven gear 50 of the platen roller 40 is rotatably supported.
[0035]
The arm 90 is supported by the reduction gear 51 via a friction mechanism (not shown) having a relatively low friction coefficient. Further, the frame 11 is provided with a regulating member (not shown) that regulates the arm 90 from rotating counterclockwise from the home position (position shown in FIG. 7). When the reduction gear 51 is rotated in the direction of arrow E in FIG. 7 by this restricting member (the platen roller 40 is rotating forward in the direction of arrow C at this time), the arm 90 moves to the home position shown in FIG. Has stopped. When the arm 90 is at the home position, the second planetary gear 92 is not engaged with the driven gear 50 of the platen roller 40. On the other hand, when the reduction gear 51 rotates in the direction of arrow F (at this time, the platen roller 40 reverses in the direction of arrow D), the arm 90 rotates in the clockwise direction in the figure. When the arm 90 swings in the same direction, as shown in FIG. 8, the second planetary gear 92 meshes with the driven gear 50 of the platen roller 40, and from the pinion 52 to the intermediate gear 80, the reduction gear 51, and the first planetary gear. 91, the driving force is transmitted to the driven gear 50 via the second planetary gear 92, and the platen roller 40 is driven in the reverse direction. This drive is maintained even when the platen roller 40 is detached from the print head 30 as the arm 90 moves following the opening operation of the cover 20.
[0036]
According to this drive system configuration, when the platen roller 40 reverses and the cover 20 gradually opens, the driven gear 50 inevitably separates from the reduction gear 51 that originally drives the platen roller 40, Although the meshing state of these gears 50 and 51 gradually becomes weak and the transmission of the driving force becomes insufficient, the second planetary gear 92 follows the opening operation of the cover 20 instead of the reduction gear 51, and the platen roller 40 Therefore, the operation of separating the platen roller 40 from the print head 30 can be completed.
[0037]
After releasing the engagement of the platen roller 40 with respect to the print head 30 in this way, the drive of the reduction gear 51 is stopped. Then, the arm 90 is lowered by the weight of the arm 90 and the weight of each planetary gear 91 and 92 against the frictional force of the friction mechanism, and returns to the home position. For example, this operation may be performed by detecting that the cover 20 has been further opened and stopping the platen drive motor at that time.
[0038]
【The invention's effect】
As described above, according to the present invention, by reversing the platen roller, the engagement of the platen roller with respect to the print head is released and the cover can be opened, so that the operability when opening the cover is improved. Has the effect of significantly improving.
[Brief description of the drawings]
FIG. 1 is a right side view showing a state in which a cover of a printer according to a first embodiment of the invention is closed.
FIG. 2 is a right side view showing a state where the print head is detached from the platen roller and the cover can be opened in the printer according to the first embodiment of the present invention.
FIG. 3 is a control block diagram of the printer according to the first embodiment of the present invention.
FIG. 4 is a flowchart for explaining an operation of opening the cover of the printer according to the first embodiment of the present invention.
FIG. 5 is a flowchart for explaining another form of the opening operation of the printer cover according to the first embodiment of the present invention;
FIG. 6 is a right side view showing a state in which a cover of a printer according to a second embodiment of the invention is closed.
FIG. 7 is a right side view illustrating a state in which a cover of a printer according to a third embodiment of the invention is closed.
FIG. 8 is a right side view illustrating a state immediately after a platen roller is reversed in a printer according to a third embodiment of the present invention.
FIG. 9 is a right side view illustrating a state in which a print head is detached from a platen roller and a cover can be opened in a printer according to a third embodiment of the present invention.
[Explanation of symbols]
10 ... Printer body
12. Paper storage unit
13 ... Auxiliary spring (biasing means)
20 ... Cover
30 ... Print head
31 ... Pressing spring (pressing means)
40 ... Platen roller
55. Platen drive motor (platen roller drive means)
S ... paper

Claims (4)

A printer main body having a paper storage section and a print head;
A cover hinged to the printer body so as to be openable and closable so as to close the paper storage section;
A platen roller that is rotatably provided on the cover and is disposed to face the print head in a closed state;
A platen roller driving means provided on the printer main body or the cover for rotating the platen roller forward and reverse;
An engagement state that is provided on at least one of the printer main body and the cover, and presses the print head and the platen roller in a relatively approaching direction when the cover is in a closed state so that they are pressed against each other. And a pressing means for maintaining the closed state of the cover,
With the cover closed, the paper fed from the paper storage unit is sandwiched between the print head and the platen roller, and the print head prints on the paper and transports the paper while rotating the platen roller forward. There line the door, the platen roller, both when normal rotation and reverse rotation, the printer receives a reaction force from the printing head,
Control means for controlling forward and reverse rotation of the platen roller by the platen roller driving means;
A cover open switch that is operated when opening the cover and supplies an ON signal for opening the cover to the control means;
When an ON signal is supplied from the cover open switch, the control means causes the platen roller driving means to perform an operation of reversing the platen roller, and a reaction force directed in the opening direction of the cover at the time of the reverse rotation. The printer is configured to release the engagement of the platen roller with respect to the print head by receiving the print.   The platen roller is configured to maintain an engaged state with a print head by receiving a reaction force directed in a closing direction of the cover during forward rotation. Printer.   The printer according to claim 1, wherein a biasing unit that biases the cover in an opening direction is provided in at least one of the printer main body and the cover. If the printer is operating when the ON signal is supplied from the cover open switch to the control means, the operation of the printer is stopped, and after the print data is discarded, the platen roller The printer according to claim 1, wherein the cover is opened in reverse.

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