JP6198914B2 - Printer device - Google Patents

Description

  Embodiments described herein relate generally to a printer device that prints and issues paper.

  In a printer device used as an issuer for receipts or the like, after printing predetermined items on a long sheet drawn from a roll wound paper, the paper is cut into a predetermined length of paper and discharged. Is going. In these printer apparatuses, the transported paper may cause a paper jam or the like in the transport path. For this reason, the printer device is provided with a detector such as a sensor for detecting a paper jam.

  In a printer that prints on a cut sheet, there is no sensor unit that detects a paper jam at the time of printing standby or after the completion of printing, and a paper jam is detected only during printing.

  In a printer using cut paper, during normal paper conveyance, a sensor that detects paper jam alternately detects paper non-detection and paper detection, making it easy to detect paper jam. However, in a printer that performs printing on a sheet wound in a roll shape, a sensor that detects a paper jam detects whether the sheet is in a waiting state, during printing, or after completion of printing. . For this reason, it is known to detect a paper jam by providing a space where the roll paper enters during conveyance.

  However, the roll paper may wrap around a platen or the like that conveys the paper, and the paper may not enter the space provided. Since the paper does not enter the provided space, the printer apparatus does not determine that the paper is jammed.

  For this reason, as a method for detecting a paper jam in the paper transport state, it is also known to provide a mark called a black mark on the back surface of the paper and detect the black mark by a sensor.

Japanese Utility Model Publication No. 2-79359

  The problem to be solved by the present invention is to provide a printer device that detects a paper jam from a back electromotive voltage waveform of a conveyance roller that conveys the paper.

A printer apparatus according to an embodiment includes a paper conveyance path that draws out and conveys a wound paper, a printing unit that performs printing on the paper, and one or more sensors arranged on the upstream side of the printing unit in the paper conveyance direction If, disposed between the rollers to rotate the the paper in contact with the outer peripheral surface of the paper, a motor for applying a driving force to the roller, an auxiliary motor for applying a driving force to the roller with the motor, the roller and the auxiliary motor It is a one-way clutch for transmitting power in one direction from the auxiliary motor to the roller, a first detection unit for detecting a paper jam state of counter electromotive voltage waveform or al a paper motor for applying a driving force to the roller, printing And a second detection unit that detects an error that has occurred in the printer device based on information from one or more sensors arranged upstream of the sheet conveyance direction.

FIG. 2 is a main part configuration diagram of the printer apparatus according to the first embodiment. FIG. 3 is an explanatory diagram of a detection position of a near-end sensor unit of the printer device according to the first embodiment. FIG. 3 is a block diagram illustrating a control circuit configuration of the printer apparatus according to the first embodiment. 3 is a flowchart for explaining a paper jam detection timing of the printer apparatus according to the first embodiment. FIG. 3 is an explanatory diagram of a conveyance motor drive circuit and a counter electromotive voltage waveform output circuit of the printer apparatus according to the first embodiment. FIG. 6 is an explanatory diagram of signal data for detecting a paper jam according to the first embodiment. FIG. 10 is a main part configuration diagram of a printer apparatus according to a second embodiment. 9 is a flowchart for explaining a paper jam detection timing of the printer apparatus according to the second embodiment.

(First embodiment)
Hereinafter, a printer apparatus according to a first embodiment of the present embodiment will be described in detail with reference to the drawings.

  FIG. 1 is a configuration diagram illustrating a main part of the printer apparatus 1 according to the first embodiment. In this printer, since the sheet is conveyed from the lower side to the upper side in the figure, in the following description, the lower side in the figure is the upstream side and the upper side is the downstream side.

  In the figure, reference numeral 2 denotes a wound roll paper. For the paper 2, a printer cover (not shown) provided in the printer device 1 is opened, and the paper 2 is loaded into the printer device 1 from above.

  At the time of loading, the sheet 2 is placed in a state in which the loading position is regulated by the sheet guide A3 and the sheet guide B4 and in contact with the transport roller 7 and the delivery roller 8 that does not have a driving force.

  The paper 2 has a first paper surface 5 and a second paper surface 6 opposite to the first paper surface 5, and only the first paper surface 5 is a heat-sensitive layer that develops color when heated. Is provided.

  An idler roller 13 is rotatably supported on the downstream side of the feed roller 8.

  Further, a conveyance guide A14 and a conveyance guide B15 are extended from the idler roller 13 of the printer apparatus 1 toward the downstream side of the printer apparatus 1, and a sheet conveyance path 16 is provided between the conveyance guide A14 and the conveyance guide B15. As a result, the sheet 2 is conveyed.

  On the downstream side of the idler roller 13, there are provided a thermal print head 17 and a platen roller 18 that can be rotated by a motor (not shown) across the paper transport path 16 with respect to the thermal print head 17. The print unit 17 is configured by the print head 17 and the platen roller 18, and the print unit 19 performs printing on the first sheet surface 5 of the sheet 2.

  A cutter 20 is disposed on the downstream side of the printing unit 19. The cutter 20 has a fixed blade and a movable blade (not shown), and the cutter motor (not shown) directs the paper 2 inserted in a slit (not shown) provided in the cutter 20 to the fixed blade. Cut by sliding by driving.

  Here, the cutter 20 has been described as a so-called slide type cutter in which the movable blade slides toward the fixed blade. However, the cutter 20 is not limited to this, and a so-called rotary type in which the movable blade rotates relative to the fixed blade to cut the paper. It may be a cutter. The cutter 20 is provided with a cutter home position sensor 20-1 described later.

  On the downstream side of the cutter 20, a discharge roller 21 that can be rotated by a motor (not shown), and a discharge idler roller 22 are disposed opposite to the discharge roller 21 with the paper transport path 16 interposed therebetween. Further, the printer apparatus 1 has a paper discharge port 23 on the downstream side of the discharge roller 21, and the paper 2 that has been printed and cut by the cutter 20 is transferred to the paper 2 by the cooperation of the discharge roller 21 and the discharge idler roller 22. The ink is discharged from the discharge port 23 to the outside of the printer apparatus 1.

  Further, the printer device 1 is provided with a display unit 24 for displaying various states including an error state of the printer device 1.

  The printer device 1 is provided with a near-end sensor 9, a paper sensor 10, and a transport motor 11. A gear (not shown) provided on the transport motor 11 and a gear (not shown) provided on one end side of the transport roller 7 are provided. Are engaged.

  Next, detection methods of the near-end sensor 9 and the paper sensor 10 will be described with reference to FIG.

  A near-end sensor 9 is fixedly installed on a frame (not shown) of the printer apparatus 1. The near-end sensor 9 has a light emitting portion and a light receiving portion (not shown), and detection light (not shown) emitted from the light emitting portion is detected by the light receiving portion, and the height of the detection light becomes the height of H. ing. Further, the roll-shaped paper 2 exists between the light emitting unit and the light receiving unit.

  When the detection light emitted from the light emitting unit reaches the light receiving unit, the arrival of the detection light is blocked if the roll-shaped paper 2 exists between them. For this reason, it is possible to detect whether the roll diameter has become smaller than a predetermined size. For example, when the diameter of the roll-shaped paper 2 is 2-F, which is the size at the time of loading, or when the paper 2 is used and the diameter of the roll-shaped paper 2 is about half that at the time of loading 2- In the case of M, since the sheet 2 exists between the light emitting unit and the light receiving unit, the detection light emitted from the light emitting unit is blocked from reaching the light receiving unit. Therefore, no light reception signal is generated from the light receiving unit.

  However, in the case of 2-E, in which the sheet 2 is used and the diameter of the roll-shaped sheet 2 is about a quarter of that at the time of loading, the sheet 2 exists between the light emitting unit and the light receiving unit. Therefore, the detection light emitted from the light emitting unit reaches the light receiving unit. For this reason, a light receiving signal is emitted from the light receiving unit.

  As described above, the near-end sensor 9 detects a case where the remaining amount of the sheet 2 is less than a predetermined amount.

  The printer device 1 is also provided with a paper sensor 10. Unlike the above-described near-end sensor, the paper sensor 10 detects whether or not the paper 2 has run out.

  The paper sensor 10 is a reflective sensor having a light emitting unit and a light receiving unit (not shown). When the paper 2 is present, the detection light emitted from the light emitting unit is reflected by the paper 2 and is reflected on the light receiving unit. Incident. As a result, the paper sensor 10 detects that the paper 2 is present. However, when the paper 2 has been used up or when the printer apparatus 1 is not loaded with paper, the detection light emitted from the light emitting unit is not reflected by the paper 2 and then does not enter the light receiving unit. Therefore, the paper sensor 10 detects that the printer device 1 has run out of paper. In the present embodiment, the paper sensor 10 has been described as a reflective sensor. However, the present invention is not limited to this, and the paper sensor 10 may be a transmissive sensor in which a light emitting unit and a light receiving unit are arranged with the paper 2 interposed therebetween. good.

  The cutter 20 is provided with a cutter home position sensor 20-1. The cutter 20 has a movable blade and a fixed blade (not shown), and cuts the paper 2 by moving the movable blade toward the fixed blade by a motor (not shown). The cutter 20 has a home position. When the cutting operation starts, the movable blade is positioned at this home position after the cutting operation is completed. The cutter home position sensor 20-1 detects whether the movable blade of the cutter 20 is located at a position other than the cutter home position due to a cutting error or a paper jam.

  FIG. 3 is a block diagram illustrating a control circuit configuration of the printer apparatus 1 according to the present embodiment. The control unit 51 performs control of remaining sheet detection, out of sheet detection, sheet conveyance, printing, sheet cutting, sheet discharge, and printer status display.

  The control unit 51 is composed of, for example, a microcomputer that links with the host computer 50 and executes various controls. A central processing unit (MPU) 52 of the control unit 51 performs various controls and calculations such as sheet remaining amount detection, sheet outage detection, sheet conveyance control, print control, sheet cutting control, and sheet discharge control according to a program.

  The MPU 52 includes a timer 53 as means for performing time setting and time control.

Further, the control unit 51 is provided with a ROM 54 and a RAM 55 as main storage means for storing a control program executed by the MPU 52, data in the process of control or calculation, and the like.
The ROM 54 is a read-only memory having a control program, a table, and the like, and the RAM 55 is an occasional write memory that stores data in the middle of calculation.

  Further, the control unit 51 is provided with an input / output unit (I / O) 56 for taking in various input data from the host computer 50 and taking out the control output of the control unit 51 to the host computer 50. . The I / O 56 is connected to the MPU 52, the ROM 54, and the RAM 55 through a bus.

  Further, the I / O 56 has first, second, third, fourth, fifth, sixth and seventh drivers 57, 58, 59, 60, 61, 62 as means for taking out the control output. 63 is connected.

  The first driver 57 supplies a necessary drive output to the printing unit 19. The second driver 58 supplies a necessary drive output to the transport motor 11. The third driver 59 supplies a necessary drive output to the near-end sensor 9. The fourth driver 60 supplies a drive output to the paper sensor 10. The fifth driver 61 supplies drive output to the cutter 20 and also supplies drive output of the cutter home position sensor 20-1. The sixth driver 62 supplies a drive output to the discharge roller 21. The seventh driver 63 supplies a display drive output for causing the display unit 24 to perform various displays.

  When printing is performed on the paper 2 by the printing unit 19, the platen roller 18 is rotationally driven by the motor in synchronization with the printing operation based on the control output as the print command means of the MPU 52. The thermal print head 17 generates heat based on print data from the host computer 50 and prints on the first surface 5 of the paper 2.

  The MPU 52 of the control unit 51 rotates and stops the transport motor 11 via the driver 58.

  The MPU 52 of the control unit 51 drives the near-end sensor 9 via the driver 59 and receives the detection result.

  The MPU 52 of the control unit 51 drives the paper sensor 10 via the driver 60 and receives the detection result.

  The MPU 52 of the control unit 51 drives the cutter 20 via the driver 61 to cut the paper 2 and receives the detection result as to whether the cutter blade is at the cutter home position.

  The MPU 52 of the control unit 51 rotates and stops the discharge roller 21 via the driver 62.

  The MPU 52 of the control unit 51 displays various information, errors, and the like of the printer device 1 on the display unit 24 via the driver 63.

  Hereinafter, the operation of the printer apparatus 1 will be described with reference to FIGS. 1, 2, 4, 5, and 6.

  First, the operator opens a printer cover (not shown) provided in the printer apparatus 1 and loads the wound roll-shaped paper 2 into the printer apparatus 1 from above. At the time of loading, the sheet 2 is placed in a state where the loading position is regulated by the sheet guide A 3 and the sheet guide B 4 and in contact with the transport roller 7 and the feed roller 8.

  Next, the paper 2 is pulled out, and after passing through the idler roller 13, the leading edge of the paper 2 is set so as to be positioned between the thermal printing head 17 and the platen roller 18.

  In this state, when print data is received from the host computer 50 (S1), the control unit 51 checks whether an error has occurred in the printer device 1 (S2). In this embodiment, the error is information that the paper sensor 10 has run out of paper or that the movable blade of the cutter 20 has not returned to the home position by the cutter home position sensor 20-1. In addition, in order to prevent the paper from running out in the middle of printing and the printing from being finished halfway, there is a case where the near-end sensor 9 detects the near end rather than the information that the paper is completely cut and treats it as out of paper. is there. In such an operation, the near-end detection by the near-end sensor 9 is also recognized as an error.

  If an error has occurred (Y in S2), the error content that is currently occurring, such as out of paper, is displayed on the display unit 24 of the printer device 1 (S3), and the printer device 1 ends printing (S4).

  If no error has occurred in the printer 1 (N in S2), the control unit 51 rotates the transport motor 11 to rotate the transport roller 7 by a specified amount in the X direction in FIG. 1 (S5). The surface of the transport roller 7 is made of a material such as rubber, and is in contact with the surface of the roll-shaped paper 2. Accordingly, when the transport roller 7 rotates in the X direction, the roll-shaped paper 2 that is in contact with the transport roller 7 rotates in the Y direction in FIG. 1 due to friction with the transport roller 7. In synchronization with this rotation, the platen roller 18 of the printing unit 19 also rotates. As a result, the paper 2 is transported by the cooperation of the thermal print head 17 and the platen roller 18 and by the transport roller 7. Note that this is a prescribed amount that rotates, but this is a set value that is known in advance and reaches a steady rotation when the transport motor 11 is rotated by this amount. If the transport motor 11 is a stepping motor, it is ** steps. It is a specified amount such as rotating. The rotation of the transport motor 11 is rotated by a specified amount in order to reach steady rotation, but continues to rotate after the specified amount of rotation.

  When the transport motor 11 is rotated by a specified amount (S5), the transport motor 11 reaches steady rotation, that is, the roll-shaped paper 2 rotating by friction with the transport roller 7 is transported at a steady speed. Then, the control unit 51 drives the printing unit 19 to perform printing on the sheet 2 (S6).

  Next, the control unit 51 periodically checks whether an error has occurred in the printer 1 during the printing process (S7). This error is paper out information by the paper sensor 10 and information that the movable blade of the cutter 20 is not returned to the home position by the cutter home position sensor 20-1 as in the above-described error occurrence check.

  If an error has occurred (Y in S7), the error content that is currently occurring, such as out of paper, is displayed on the display unit of the printer apparatus 1 (S3), and the printer apparatus 1 ends printing (S4). If no error has occurred (N in S7), the control unit 51 checks whether a paper jam has occurred in the printer 1 (S8).

  A method for detecting whether or not a paper jam has occurred in the printer apparatus 1 will be described with reference to FIGS.

  The transport motor 11 is provided with a drive circuit 12, and when the transport motor 11 is rotated, a drive signal shown in FIG. Further, from this drive circuit, a counter electromotive voltage waveform generated with the rotation of the transport motor 11 is taken out.

  The lead wire coming out of the transport motor 11 is common for driving and for measuring the counter electromotive voltage waveform, and the waveform can be acquired by the same driving circuit.

  FIG. 6B shows a counter electromotive voltage waveform generated with the rotation of the transport motor 11 when no paper jam has occurred. In the counter electromotive voltage waveform shown in FIG. 6B, the control unit 51 confirms whether t1 and t2 are generated at a predetermined time interval, and if they are generated at a predetermined time interval. Judge that there is no paper jam. Note that the back electromotive force waveform is different from when the conveyance motor 11 reaches the steady rotation from the stopped state to after the steady rotation is reached. For this reason, the control unit 51 checks the counter electromotive voltage waveform after the point S in FIG. 6 at the time when the conveyance motor 11 is rotated by a specified amount and reaches a steady rotation.

  FIG. 6C shows a back electromotive voltage waveform when a paper jam occurs in the printing process. If a paper jam occurs at point J in FIG. 6, t1 and t2 do not occur at predetermined time intervals as shown in the figure, and a different signal t3 is generated. As a result, the control unit 51 determines that a paper jam has occurred. In this way, the control unit 51 of the printer apparatus 1 determines whether a paper jam has occurred in the printer apparatus 1 based on the counter electromotive voltage waveform of the transport motor 11.

  When it is determined that a paper jam has occurred in the printer apparatus 1 (Y in S8), the occurrence of a paper jam is displayed on the display unit 24 of the printer apparatus 1 (S3), and the printing of the printer apparatus 1 is terminated (S4). ). If no paper jam has occurred (N in S8), the control unit 51 checks whether printing has been completed (S9). When the printing is finished (Y in S9), the printing by the printer device 1 is finished (S10). If printing has not ended (N in S9), the process returns to printing (S6), and an error occurrence check (S7) and a paper jam occurrence check (S8) are performed until printing is completed.

  For example, in the printer apparatus 1 shown in FIG. 1, when the error detection mechanism is only the near-end sensor 9, the paper sensor 10, and the cutter home position sensor 20-1, the sheet 2 is wound around the platen roller 18 and is downstream in the print conveyance direction. If the remaining amount of paper 2 remains, the near-end sensor 9 and the paper sensor 10 do not detect an error, and the cutter home position sensor 20-1 does not detect an error. Therefore, even if the paper 2 is wound around the platen roller 18 and the paper jam occurs, the printer apparatus 1 does not recognize that the paper jam error has occurred. However, in the detection of a paper jam based on the back electromotive voltage waveform of the conveying roller 7 according to the present embodiment, it is possible to detect the occurrence of a paper jam at any position of the printer apparatus 1.

  It is also known that a mark called a black mark is provided on the second paper surface 6 of the paper 2 and detected by a black mark sensor provided separately with this black mark to detect whether a paper jam has occurred. However, in that case, it is necessary to use a special paper in which a black mark is provided on the second paper surface 6 of the paper 2 and at the same time to provide a black mark sensor. There is also a concern that black marks may be erroneously detected due to adhesion of paper dust or the like to the black mark sensor.

  In this respect, in this embodiment, paper jam is detected by the back electromotive force waveform of the transport motor that transports the paper, so it is possible to detect where the paper is jammed, and to detect special paper and it. There is no need to add additional sensors. Further, since the counter electromotive voltage waveform of the transport motor is used, it is not affected by paper dust or the like, and no erroneous detection occurs due to dirt on the sensor surface due to paper dust or the like.

(Second Embodiment)
Hereinafter, a printer device 1 according to a second embodiment of the present embodiment will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected in the same component as 1st Embodiment, and the detailed description is abbreviate | omitted.

  In order to reach the steady rotation at which printing can be performed from the state where the rotation of the sheet 2 is stopped, the transport motor 11 is rotated by a set amount that is grasped in advance, and then printing is performed. However, when the diameter of the sheet 2 is large, a large load is applied at the start of rotation, and it takes time until the steady rotation is reached. If the arrival time is long, the printing start is delayed accordingly. In order to prevent this, in the second embodiment, an auxiliary motor 111 is provided for assisting the conveyance motor 11 to reach steady rotation from the rotation stopped state, and after the conveyance motor 11 reaches steady rotation, the auxiliary motor is provided. The rotation of 111 is stopped, and then a paper jam in the printer apparatus 1 is detected based on the back electromotive force waveform of the transport motor 111.

  FIG. 7 is a configuration diagram illustrating a main part of the printer apparatus 101 according to the second embodiment.

  The printer apparatus 101 is newly provided with an auxiliary motor 111, a transmission gear 112, and a one-way clutch 113. Further, a gear (not shown) is provided on one end side of the transport roller 7 so as to mesh with a gear (not shown) provided on the transport motor 111, but another gear (not shown) is provided on the other end side of the transport roller 7. This gear is connected to a gear (not shown) provided in the one-way clutch 113, the transmission gear 112, and the auxiliary motor 111.

  Hereinafter, the operation of the printer apparatus 101 will be described with reference to FIG. The operator places the paper 2 in contact with the transport roller 7 and the delivery roller 8, then pulls out the paper 2, passes through the idler roller 13, and the leading edge of the paper 2 is positioned between the thermal print head 17 and the platen roller 18. Set so that it is located at.

  When print data is received from the host computer 50 in this state (S21), the control unit 51 checks whether an error has occurred in the printer device 1 (S22). This error is error detection by the paper sensor 10 and the cutter home position 20-1 as described above, and includes near-end detection by the near-end sensor 9 as necessary.

  If an error has occurred (Y in S22), the error content occurring on the display unit 24 of the printer apparatus 101 is displayed (S23), and the printer apparatus 101 ends printing (S24).

  If no error has occurred in the printer apparatus 101 (N in S22), the control unit 51 rotates the carry motor 11 and the auxiliary motor 111 by a specified amount (S25). The driving force of the transport motor 11 is transmitted through a gear (not shown) to a gear (not shown) on one end side of the transport roller 7. Thus, the driving force of the transport motor 11 is transmitted to the transport roller 7.

  The driving force of the auxiliary motor 111 is transmitted to a gear (not shown), a transmission gear 112, a one-way clutch 113, and a gear (not shown) on the other end side of the conveying roller 7 provided in the auxiliary motor 111. In this way, the driving force of the auxiliary motor 111 is transmitted to the transport roller 7. That is, when the transport motor 11 and the auxiliary motor 111 are simultaneously rotated, the driving forces of both are transmitted to the transport roller 7 and the roll-shaped paper 2 is rotated. Here, the transport motor 11 and the auxiliary motor 111 are rotated by a specified amount, and this specified amount is a specified amount that reaches the steady rotation when the transport motor 11 and the auxiliary motor 111 are rotated by this amount.

  After the transport motor 11 and the auxiliary motor 111 are rotated by a predetermined amount (S25), the control unit 51 stops the auxiliary motor 111 (S26). Here, the control unit 51 stops the auxiliary motor 111, but the conveyance motor 11 continues to rotate. Accordingly, the conveyance roller 7 continues to rotate only with the driving force transmitted from the conveyance motor 11.

  When the auxiliary motor 111 is stopped, the driving force of the auxiliary motor 111 is not transmitted to the transport roller 7. Here, if the auxiliary motor 111 is simply stopped, the transmission path between the auxiliary motor 111 and the transport roller 7 remains, so the stopped auxiliary motor 111 becomes a rotation load of the transport roller 7. End up.

  In order to prevent this, in the present embodiment, a one-way clutch 113 is interposed in the transmission path of the driving force between the auxiliary motor 111 and the conveying roller 7. The one-way clutch 113 has a function of transmitting driving force from the auxiliary motor 111 to the transport roller 7. However, when the auxiliary motor 111 is stopped, since the transport roller 7 continues to rotate by the transport motor 11, the one-way clutch 113 is operated thereafter, and the transmission path from the transport roller 7 to the transmission gear 112 is interrupted (S27). As a result, the stopped auxiliary motor 111 does not become a rotation load of the conveying roller 7.

  The auxiliary motor 111 and the conveying roller 7 are rotated by a specified amount (S25), then only the auxiliary motor 111 is stopped (S26), and the driving force transmission path between the auxiliary motor 111 and the conveying roller 7 is blocked (S27). At this point, the transport motor 11 reaches a steady rotation, that is, the roll-shaped paper 2 rotating by friction with the transport roller 7 is transported at a steady speed, so the control unit 51 drives the printing unit 19. Then, printing is performed on the sheet 2 (S28).

  Next, the control unit 51 periodically checks whether an error has occurred in the printer 1 during the printing process (S29). This error is, for example, out-of-paper information by the paper sensor 10 and information that the cutter 20 is not returned to the home position by the cutter home position sensor 20-1 as in the above-described error occurrence check.

  If an error has occurred (Y in S29), the error content that is currently occurring, such as out of paper, is displayed on the display unit 24 of the printer apparatus 1 (S23), and the printer apparatus 101 terminates printing (S24). If no error has occurred (N in S29), the control unit 51 checks whether a paper jam has occurred in the printer apparatus 101 (S30). Note that the detection method for detecting whether a paper jam has occurred in the printer apparatus 101 is the same as the detection method in the first embodiment described with reference to FIG.

  Due to the action of the one-way clutch 113, the transmission path of the driving force between the auxiliary motor 111 and the conveying roller 7 is blocked at the point S in FIG. Therefore, there is no influence on the back electromotive voltage waveform of the transport motor 11 due to an increase in the load on the transport motor 11 due to the stop of the auxiliary motor 111, and the back electromotive voltage waveform can detect only a paper jam.

  When it is determined that a paper jam has occurred in the printer apparatus 101 (Y in S30), the occurrence of the paper jam is displayed on the display unit 24 of the printer apparatus 101 (S23), and the printing of the printer apparatus 101 is terminated (S24). ). If no paper jam has occurred (N in S30), the control unit 51 checks whether printing has been completed (S31). When the printing is finished (Y in S31), the printing by the printer apparatus 101 is finished (S32). If printing has not ended (N in S31), the process returns to printing (S28), and an error occurrence check (S29) and a paper jam occurrence check (S30) are performed until printing is completed.

  Thus, as described above, even if the error detection mechanism is only the near-end sensor 9, the paper sensor 10, and the cutter home position sensor 20-1 in the printer apparatus 101, the printer apparatus 101 can determine that a paper jam has occurred. Further, it is possible to detect a paper jam without using a black mark paper and providing a black mark sensor, and at the same time, it is possible to prevent erroneous detection due to the influence of paper dust or the like.

  Further, the power consumption can be reduced by stopping the auxiliary motor 11, and the noise caused by the auxiliary motor 11 can be reduced.

  Here, the position of the transport roller 7 is preferably provided in the direction A in FIG. 1 upstream of the vertical line passing through the center of the roll-shaped paper 2 in the paper transport direction.

  Since the paper 2 is only placed on the transport roller 7 and the feed roller 8, when the paper 2 is pulled out by the thermal print head 17 and the platen roller 18, the paper is drawn from a vertical line passing through the center of the roll-like paper 2. It becomes easy to move in the A direction which is the upstream side in the transport direction.

  As shown in FIG. 1, if the conveyance roller 7 is provided in the A direction in which it moves, the back electromotive voltage waveform of the conveyance motor 11 connected to the conveyance roller 7 is correctly output. However, if the transport roller 7 and the transport motor 11 are provided at the position of the feed roller 8 in FIG. 1, the contact between the transport roller 7 and the paper 2 may be separated when the roll-shaped paper 2 moves in the A direction. When this contact is released, the counter electromotive voltage waveform of the transport motor 11 is also affected, and there is a possibility that a paper jam is detected although it is not a paper jam. Thus, it is desirable that the transport motor 11 for detecting the counter electromotive voltage is provided on the upstream side in the paper transport direction from the vertical line passing through the center of the roll-shaped paper 2.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

1: Printer device 2: Paper 7: Conveyance roller
8: Delivery roller 9: Near-end sensor 10: Paper sensor 11: Conveyance motor 17: Thermal print head 18: Platen roller 20: Cutter

Claims (4)

A paper transport path for pulling out and transporting the wound paper;
A printing unit for printing on the paper;
One or a plurality of sensors arranged upstream of the printing unit in the paper conveyance direction;
A roller for rotating the paper in contact with the outer peripheral surface of the paper;
A motor for applying a driving force to the roller;
An auxiliary motor for applying a driving force to the roller together with the motor;
A one-way clutch that is disposed between the roller and the auxiliary motor and transmits power in one direction from the auxiliary motor to the roller;
A first detection unit for detecting a paper jam state of the paper from the back electromotive voltage waveform of the motor for applying a driving force to the roller,
A second detection unit that detects an error that has occurred in the printer device based on information from the one or more sensors disposed upstream of the printing unit in the paper conveyance direction;
A printer apparatus. The first detection unit detects a paper jam state of the paper from a back electromotive voltage waveform after reaching the steady rotation of the motor,
The second detection unit detects a paper jam state of the paper after reaching the steady rotation in addition to before reaching the steady rotation of the motor.
The printer apparatus according to claim 1. The one or more sensors include at least one of a sheet sensor that detects the presence or absence of the sheet on the sheet conveyance path and a sheet near-end sensor that detects whether the remaining amount of the sheet is lower than a predetermined amount. Composed,
The printer device according to claim 1. The first detection unit detects a paper jam state of the paper from a back electromotive voltage waveform after the motor reaches a steady rotation ,
Before SL auxiliary motor before the motor reaches the steady rotations, soon the steady rotation arrival of the motor by applying a driving force to the roller via the one-way clutch, the motor is in steady rotation After reaching, stop applying the driving force to the roller,
The printer device according to any one of claims 1 to 3.

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