JP3985535B2 - Printer paper feed DC motor control device and control method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper feeding DC motor control apparatus and control method for a printer, and in particular, a belt-like printing paper that has been drawn out from a roll paper wound with a belt-like printing paper and printed is cut by a cutter during a subsequent printing operation. The present invention relates to a paper feed DC motor control device and a control method for a printer that can prevent a decrease in print quality due to a change in the posture of the print paper during printing.
[0002]
[Prior art]
Currently, many printers that are widely used in ordinary homes and offices are capable of printing digital photographic images with high quality. When printing such photographic images, belt-shaped printing paper is wound. Roll paper is increasingly used.
[0003]
Since the roll paper is a roll of continuous strip-shaped printing paper, the printed portion of the strip-shaped printing paper must be separated for each image after image printing. In the early days when roll paper began to be used, the user was using the scissors to separate the printed belt-like print paper, but now it is automatically performed using a cutter built in or attached to the printer. In addition, models that perform a cutting operation on printed strip-shaped printing paper are becoming widespread.
[0004]
[Problems to be solved by the invention]
In a printer with a built-in or attached cutter, in order to prevent a reduction in printing throughput, a cutting operation for printed strip-shaped printing paper is performed in parallel with the subsequent image printing operation.
[0005]
However, if such operation control is performed, it is possible to prevent a decrease in printing throughput, but the posture of the printing paper slightly changes due to the cutting paper cutting operation of the cutter. If the timing of the paper cutting operation overlaps, the quality of subsequent image printing may be reduced, such as white spots or black streaks.
[0006]
The present invention has been made in view of the above-described problems, and the purpose of the present invention is printed in a printer with a built-in or attached cutter, particularly when printing is performed using a roll paper wound with a belt-like printing paper. By providing a paper feed DC motor control device and control method for a printer that can prevent deterioration in the quality of subsequent image printing even if the strip printing paper cutting operation and the subsequent image printing operation are performed in parallel. is there.
[0007]
[Means for Solving the Problems]
According to the paper feed DC motor control device of the printer according to the present invention, the amount of deviation due to the change in the posture of the printing paper generated by the printing paper cutting operation of the cutter is canceled, and the posture of the printing paper is changed to the state at the start of the cutting operation. In order to hold the current, the paper feed DC motor is energized with a correction current value for a driving operation that cancels out the deviation amount obtained in advance for each type and size of the printing paper according to the type and size of the printing paper. Is provided with a cut operation correction control section that commands the time between immediately before the start of the cut operation and immediately after the end of the cut operation.
[0008]
According to the paper feed DC motor control method of the printer according to the present invention, the amount of deviation due to the change in the posture of the printing paper generated by the printing paper cutting operation of the cutter is canceled, and the posture of the printing paper is set to the state at the start of the cutting operation. In order to hold the current, the paper feed DC motor is energized with a correction current value for a driving operation that cancels out the deviation amount obtained in advance for each type and size of the printing paper according to the type and size of the printing paper. Is commanded between immediately before the start of the cutting operation and immediately after the end of the cutting operation.
[0009]
The paper feeding DC motor control device and control method for a printer according to the present invention, with the above configuration, can perform the quality of the subsequent image printing even if the cutting operation of the printed belt-shaped printing paper and the subsequent image printing operation are performed in parallel. The decrease can be prevented in advance.
[0010]
A more specific configuration of the paper feed DC motor control device and control method for a printer according to the present invention is as follows.
[0011]
According to the paper feed DC motor control device of the printer according to the first embodiment of the present invention,
In order to offset the deviation due to the change in the posture of the printing paper caused by the cutting paper cutting operation of the cutter and maintain the posture of the printing paper in the state at the start of the cutting operation, it is obtained in advance for each type and size of the printing paper. A memory for storing and holding a correction current value for a driving operation that cancels the deviation amount;
A central processing unit that reads out and outputs the correction current value corresponding to the setting of the type and size of printing paper from the memory, and outputs a cut operation notification when the cutter performs the cut operation;
Cut operation correction control unit that outputs a correction command value energization command for instructing energization to the paper feed DC motor of the correction command value corresponding to the setting of the type and size of printing paper when the cut operation notification is input When,
It is characterized by having.
[0013]
According to the paper feed DC motor control method of the printer according to the first embodiment of the present invention,
In order to offset the deviation due to the change in the posture of the printing paper caused by the cutting paper cutting operation of the cutter and maintain the posture of the printing paper in the state at the start of the cutting operation, it is obtained in advance for each type and size of the printing paper. A selection step of selecting a correction current value for a driving operation that cancels the deviation amount in accordance with the setting of the type and size of the printing paper;
A notification step for notifying the cutting operation when the cutter performs the printing paper cutting operation;
A correction control step for performing a correction command value energization command for instructing energization of the paper feed DC motor of the selected correction command value when the cut operation notification is input;
It is characterized by having.
[0014]
The energization of the correction command value to the paper feed motor may be energization of a fixed correction command value from immediately before the start time of the cutting operation to immediately after the end time.
[0015]
The energization of the correction command value to the paper feed motor may be energization of a pulse-shaped correction command value from immediately before the cutting operation start time to a predetermined time before the cutting operation end time.
[0016]
The energization of the correction command value to the paper feed motor may be energization that decreases the correction command value from the initial value to 0 in a period from immediately before the start time of the cut operation to immediately after the end time.
[0017]
The correction command value decrease pattern may be a linear decrease pattern.
[0018]
The decrease pattern of the correction command value may be an exponential decrease pattern.
[0019]
According to the paper feed DC motor control device of the printer according to the second embodiment of the present invention,
A central processing unit that outputs a cutting action notification when the cutter performs a printing paper cutting action;
In order to detect the deviation due to the change in the posture of the printing paper generated by the printing paper cutting operation of the cutter, the output encoder pulse of the paper feed DC motor encoder is monitored in accordance with the cutting operation notification, and the change in the output encoder pulse A cut operation correction control unit that outputs a correction command value energization command for instructing energization to the paper feed DC motor of a correction command value for a driving operation that cancels the deviation amount represented by
It is characterized by having.
[0020]
According to the paper feed DC motor control method of the printer according to the second embodiment of the present invention,
A notification step for notifying the cutting operation when the cutter performs the printing paper cutting operation;
A monitoring step of monitoring an output encoder pulse of the paper feed DC motor encoder in response to the notification of the cutting operation in order to detect a deviation amount due to a change in posture of the printing paper generated by the printing paper cutting operation of the cutter;
A correction control step of performing a correction command value energization command for instructing energization of the paper feed DC motor for a correction operation value for a driving operation that cancels the deviation amount represented by the change in the output encoder pulse;
It is characterized by having.
[0021]
According to a recording medium for a computer program according to the present invention, a computer program for executing the paper feeding DC motor control method for a printer according to the present invention in a computer system is recorded.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
First, a schematic configuration and control method of an ink jet printer, which is a main application target of a paper feed DC motor control device and control method for a printer according to the present invention, will be described.
[0023]
FIG. 10 is a block diagram showing a schematic configuration of the ink jet printer.
[0024]
The ink jet printer shown in FIG. 10 ejects ink onto a paper feed motor (hereinafter also referred to as PF motor) 1 that feeds paper, a paper feed motor driver 2 that drives the paper feed motor 1, and printing paper 50. The head 9 is fixed, the carriage 3 is driven in a direction parallel to the printing paper 50 and perpendicular to the paper feeding direction, a carriage motor (hereinafter also referred to as a CR motor) 4 for driving the carriage 3, and a carriage motor. 4, a DC motor 6 that delivers a motor drive command value to the CR motor driver 5, a pump motor 7 that controls the suction of ink to prevent clogging of the head 9, and a pump motor 7 A pump motor driver 8 that drives the head 9, a head driver 10 that drives and controls the head 9, and a liner fixed to the carriage 3. Encoder 11, linear encoder 11 code plate 12 having slits formed at predetermined intervals, rotary encoder 13 for PF motor 1, and paper detection sensor for detecting the end position of the paper being printed 15, a CPU 16 that controls the entire printer, a timer IC 17 that periodically generates an interrupt signal for the CPU 16, and an interface unit that transmits and receives data to and from the host computer 18 (hereinafter also referred to as IF). 19, an ASIC 20 for controlling the print resolution, the drive waveform of the head 9 and the like based on print information sent from the host computer 18 via the IF 19, and a PROM 21 used as a work area and a program storage area for the ASIC 20 and the CPU 16. The RAM 22 and the EEPROM 23 and the printing paper 50 are supported. It is composed of a latin 25, a conveyance roller 27 that is driven by the PF motor 1 to convey the printing paper 50, a pulley 30 that is attached to the rotating shaft of the CR motor 4, and a timing belt 31 that is driven by the pulley 30. Yes.
[0025]
The DC unit 6 drives and controls the paper feed motor driver 2 and the CR motor driver 5 based on the control command sent from the CPU 16 and the outputs of the encoders 11 and 13. Further, both the paper feed motor 1 and the CR motor 4 are constituted by DC motors.
[0026]
FIG. 11 is a perspective view showing a configuration around the carriage 3 of the ink jet printer.
[0027]
As shown in FIG. 11, the carriage 3 is connected to the carriage motor 4 via a pulley 30 by a timing belt 31, and is driven so as to move parallel to the platen 25 while being guided by a guide member 32. A recording head 9 having a nozzle row for ejecting black ink and a nozzle row for ejecting color ink is provided on the surface of the carriage 3 facing the printing paper, and each nozzle is supplied with ink from the ink cartridge 34 for printing. Characters and images are printed by ejecting ink droplets on paper.
[0028]
Further, in the non-printing area of the carriage 3, a capping device 35 for sealing the nozzle openings of the recording head 9 at the time of non-printing and a pump unit 36 having the pump motor 7 shown in FIG. 10 are provided. . When the carriage 3 moves from the printing area to the non-printing area, the carriage 3 comes into contact with a lever (not shown), the capping device 35 moves upward, and the head 9 is sealed.
[0029]
When the nozzle opening row of the head 9 is clogged or when the ink is forcibly ejected from the head 9 by replacing the cartridge 34 or the like, the pump unit 36 is operated with the head 9 sealed. The ink is sucked out from the nozzle opening row by the negative pressure from the pump unit 36. As a result, dust and paper dust adhering to the vicinity of the nozzle opening row are washed, and air bubbles in the head 9 are discharged to the cap 37 together with ink.
[0030]
FIG. 12 is an explanatory diagram schematically showing the configuration of the linear encoder 11 attached to the carriage 3.
[0031]
The encoder 11 illustrated in FIG. 12 includes a light emitting diode 11a, a collimator lens 11b, and a detection processing unit 11c. The detection processing unit 11c includes a plurality (four) of photodiodes 11d, a signal processing circuit 11e, and two comparators 11fA and 11fB.
[0032]
When the voltage VCC is applied across the light emitting diode 11a via a resistor, light is emitted from the light emitting diode 11a. This light is condensed into parallel light by the collimator lens 11 b and passes through the code plate 12. The code plate 12 is provided with slits at predetermined intervals (for example, 1/180 inch (1 inch = 2.54 cm)).
[0033]
The parallel light that has passed through the code plate 12 enters each photodiode 11d through a fixed slit (not shown) and is converted into an electrical signal. The electric signals output from the four photodiodes 11d are processed in the signal processing circuit 11e, the signals output from the signal processing circuit 11e are compared in the comparators 11fA and 11fB, and the comparison result is output as a pulse. Pulses ENC-A and ENC-B output from the comparators 11fA and 11fB are output from the encoder 11.
[0034]
FIG. 13 is a timing chart showing waveforms of two output signals of the encoder 11 at the time of forward rotation and reverse rotation of the CR motor.
[0035]
As shown in FIGS. 13A and 13B, the phase of the pulse ENC-A and the pulse ENC-B differ by 90 degrees in both cases of the CR motor forward rotation and reverse rotation. When the CR motor 4 is rotating forward, that is, when the carriage 3 is moving in the main scanning direction, the pulse ENC-A is 90 degrees from the pulse ENC-B, as shown in FIG. When the phase is advanced only by the time and the CR motor 4 is reversely rotated, the encoder 4 is configured so that the phase of the pulse ENC-A is delayed by 90 degrees from the pulse ENC-B, as shown in FIG. ing. One period T of the pulse corresponds to the slit interval (for example, 1/180 inch) of the code plate 12, and is equal to the time for the carriage 3 to move the slit interval.
[0036]
On the other hand, the rotary encoder 13 for the PF motor 1 has the same configuration as that of the linear encoder 11 except that the code plate is a rotating disc that rotates in accordance with the rotation of the PF motor 1, and has two output pulses. ENC-A and ENC-B are output. In the ink jet printer, the slit interval of the plurality of slits provided on the code plate of the rotary encoder 13 for the PF motor 1 is 1/180 inch, and when the PF motor 1 rotates by the 1 slit interval, 1 / The paper is fed by 1440 inches.
[0037]
FIG. 14 is a perspective view showing portions related to paper feed and paper detection.
The position of the paper detection sensor 15 shown in FIG. 10 will be described with reference to FIG. In FIG. 14, the printing paper 50 inserted into the paper feed insertion slot 61 of the printer 60 is sent into the printer 60 by a paper feed roller 64 driven by a paper feed motor 63. The leading edge of the printing paper 50 fed into the printer 60 is detected by, for example, the optical paper detection sensor 15. The paper 50 whose leading edge is detected by the paper detection sensor 15 is fed by the paper feed roller 65 and the driven roller 66 driven by the PF motor 1.
[0038]
Subsequently, printing is performed by dropping ink from a recording head (not shown) fixed to the carriage 3 that moves along the carriage guide member 32. When the paper is fed to a predetermined position, the end of the currently printed printing paper 50 is detected by the paper detection sensor 15. The printed paper 50 that has been printed is discharged from the paper discharge port 62 to the outside by the paper discharge roller 68 and the driven roller 69 driven by the gear 67C via the gears 67A and 67B driven by the PF motor 1. A rotary encoder 13 is connected to the rotation shaft of the paper feed roller 65.
[0039]
FIG. 15 is a perspective view showing in detail a portion related to paper feeding of the printer.
[0040]
Of the portions of the printer shown in FIG. 14, portions related to paper feeding will be described in more detail with reference to FIGS. 14 and 15.
[0041]
When the leading edge of the printing paper 50 inserted through the paper feed insertion port 61 of the printer 60 and fed into the printer 60 by the paper feed roller 64 is detected by the paper detection sensor 15, the PF motor 1 passes through the small gear 87. A paper feed roller 65 provided around a smap shaft 83 that is a rotation shaft of the driven large gear 67a and a holder 89 that presses the printing paper 50 fed from the paper feeding side downward in the vertical direction. The printing paper 50 is fed by a driven roller 66 provided at the front end of the paper feeding direction on the paper discharge side.
[0042]
The PF motor 1 is fixed to a frame 86 in the printer 60 with screws 85, a rotary encoder 13 is disposed at a predetermined location around the large gear 67a, and a smap shaft 83 which is a rotation shaft of the large gear 67a. A rotary encoder code plate 14 is connected to the encoder.
[0043]
The printing paper 50 that has been fed by the paper feeding roller 65 and the driven roller 66 passes over the platen 84 that supports the printing paper 50, and the small gear 87, the large gear 67 a, the intermediate gear 67 b, the small gear 88, and the like. The paper is fed between a paper discharge roller 68 driven by the PF motor 1 via a paper discharge gear 67c and a serrated roller 69 as a driven roller, and is fed to the outside through a paper discharge port 62.
[0044]
While the printing paper 50 is supported on the platen 84, the carriage 3 moves left and right along the guide member 32 in the space on the platen 84, and ink is ejected from a recording head (not shown) fixed to the carriage 3. Is discharged and printing is performed.
[0045]
Next, a configuration of a DC unit 6 that is a conventional DC motor control device that controls the CR motor 4 of the above-described inkjet printer, and a control method by the DC unit 6 will be described.
[0046]
FIG. 16 is a block diagram showing a configuration of a DC unit 6 which is a conventional DC motor control device, and FIG. 17 is a graph showing a motor current and a motor speed of the CR motor 4 controlled by the DC unit 6. is there.
[0047]
The DC unit 6 shown in FIG. 16 includes a position calculator 6a, a subtractor 6b, a target speed calculator 6c, a speed calculator 6d, a subtractor 6e, a proportional element 6f, an integral element 6g, a differential It comprises an element 6h, an adder 6i, a D / A converter 6j, a timer 6k, and an acceleration controller 6m.
[0048]
The position calculator 6a detects the rising edge and the falling edge of each of the output pulses ENC-A and ENC-B of the encoder 11, counts the number of detected edges, and based on the counted value, the carriage 3 The position of is calculated. This count is incremented by “+1” when one edge is detected when the CR motor 4 is rotating in the forward direction, and “−1” when one edge is detected when the CR motor 4 is rotating in the reverse direction. Is added. The period of each of the pulses ENC-A and ENC-B is equal to the slit interval of the code plate 12, and the phase of the pulse ENC-A and the pulse ENC-B differ by 90 degrees. Therefore, the count value “1” of the count corresponds to ¼ of the slit interval of the code plate 12. Thus, if the count value is multiplied by 1/4 of the slit interval, the amount of movement from the position of the carriage 3 corresponding to the count value “0” can be obtained. At this time, the resolution of the encoder 11 is ¼ of the interval between the slits of the code plate 12. If the interval between the slits is 1/180 inch, the resolution is 1/720 inch.
[0049]
The subtractor 6b calculates a position deviation between the target position sent from the CPU 16 and the actual position of the carriage 3 obtained by the position calculation unit 6a.
[0050]
The target speed calculator 6c calculates the target speed of the carriage 3 based on the position deviation that is the output of the subtractor 6b. This calculation is performed by multiplying the position deviation by the gain KP. This gain KP is determined according to the position deviation. Note that the value of the gain KP may be stored in a table (not shown).
[0051]
The speed calculator 6 d calculates the speed of the carriage 3 based on the output pulses ENC-A and ENC-B of the encoder 11. This speed is obtained as follows. First, the rising edge and the falling edge of each of the output pulses ENC-A and ENC-B of the encoder 11 are detected, and the time interval between edges corresponding to 1/4 of the slit interval of the code plate 12 is determined by a timer counter. Count. If this count value is T and the slit interval of the code plate 12 is λ, the carriage speed can be obtained as λ / (4T). Here, the calculation of the speed is obtained by measuring one cycle of the output pulse ENC-A, for example, from the rising edge to the next rising edge with a timer counter.
[0052]
The subtractor 6e calculates a speed deviation between the target speed and the actual speed of the carriage 3 calculated by the speed calculation unit 6d.
[0053]
The proportional element 6f multiplies the speed deviation by a constant Gp and outputs the multiplication result. The integration element 6g integrates the speed deviation multiplied by a constant Gi. The differentiation element 6h multiplies the difference between the current speed deviation and the previous speed deviation by a constant Gd, and outputs the multiplication result. The calculation of the proportional element 6f, the integral element 6g, and the derivative element 6h is performed in synchronization with the rising edge of the output pulse ENC-A, for example, for each cycle of the output pulse ENC-A of the encoder 11.
[0054]
The outputs of the proportional element 6f, the integral element 6g, and the derivative element 6h are added by the adder 6i. Then, the addition result, that is, the driving current of the CR motor 4 is sent to the D / A converter 6j and converted into an analog current. The CR motor 4 is driven by the driver 5 based on the analog voltage.
[0055]
The timer 6k and the acceleration control unit 6m are used for acceleration control, and the PID control using the proportional element 6f, the integral element 6g, and the derivative element 6h is used for constant speed and deceleration control during acceleration.
[0056]
The timer 6k generates a timer interrupt signal every predetermined time based on the clock signal sent from the CPU 16.
[0057]
Each time the acceleration control unit 6m receives the timer interrupt signal, the acceleration control unit 6m integrates a predetermined current value (for example, 20 mA) to the target current value, and the integration result, that is, the target current value of the DC motor 4 during acceleration is D / A is sent to the A converter 6j. As in the case of PID control, the target current value is converted into an analog current by the D / A converter 6j, and the CR motor 4 is driven by the driver 5 based on this analog current.
[0058]
The driver 5 includes, for example, four transistors, and (a) an operation mode in which the CR motor 4 is rotated forward or reverse by turning each of the transistors on or off based on the output of the D / A converter 6j. b) Regenerative brake operation mode (short brake operation mode, i.e., mode in which the CR motor is stopped) and (c) mode in which the CR motor is to be stopped can be performed.
[0059]
Next, the operation of the DC unit 6, that is, a conventional DC motor control method will be described with reference to FIGS. 17 (a) and 17 (b).
[0060]
When the start command signal for starting the CR motor 4 is sent from the CPU 16 to the DC unit 6 when the CR motor 4 is stopped, the start initial current value I0 is sent from the acceleration control unit 6m to the D / A converter 6j. It is done. This starting initial current value I0 is sent from the CPU 16 to the acceleration control unit 6m together with the starting command signal. The current value I0 is converted to an analog voltage by the D / A converter 6j and sent to the driver 5, and the CR motor 4 starts to be started by the driver 5 (see FIGS. 17A and 17B). After receiving the start command signal, a timer interrupt signal is generated from the timer 6k every predetermined time. Each time the acceleration control unit 6m receives a timer interrupt signal, the acceleration control unit 6m adds a predetermined current value (for example, 20 mA) to the startup initial current value I0, and sends the integrated current value to the D / A converter 6j. Then, the integrated current value is converted into an analog current by the D / A converter 6j and sent to the driver 5. Then, the CR motor is driven by the driver 5 and the speed of the CR motor 4 is increased so that the value of the current supplied to the CR motor 4 becomes the integrated current value (see FIG. 17B). For this reason, the current value supplied to the CR motor 4 is stepped as shown in FIG. At this time, the PID control system is also operating, but the D / A converter 6j selects and takes in the output of the acceleration control unit 6m.
[0061]
The integration process of the current value of the acceleration control unit 6m is performed until the integrated current value becomes a constant current value IS. When the current value integrated at time t1 reaches a predetermined value IS, the acceleration control unit 6m stops the integration process and supplies a constant current value IS to the D / A converter 6j. Thus, the driver 5 is driven so that the value of the current supplied to the CR motor 4 becomes the current value IS (see FIG. 17A).
[0062]
In order to prevent the speed of the CR motor 4 from overshooting, when the CR motor 4 reaches a predetermined speed V1 (see time t2), acceleration control is performed so as to reduce the current supplied to the CR motor 4. The unit 6m controls. At this time, the speed of the CR motor 4 further increases, but when the speed of the CR motor 4 reaches a predetermined speed Vc (see time t3 in FIG. 17B), the D / A converter 6j outputs the output of the PID control system. That is, the output of the adder 6i is selected and PID control is performed.
[0063]
That is, the target speed is calculated based on the position deviation between the target position and the actual position obtained from the output of the encoder 11, and based on the speed deviation between the target speed and the actual speed obtained from the output of the encoder 11. Thus, the proportional element 6f, the integral element 6g, and the differential element 6h operate to perform proportional, integral, and differential calculations, respectively, and the CR motor 4 is controlled based on the sum of these calculation results. The proportional, integral and differential calculations are performed in synchronization with the rising edge of the output pulse ENC-A of the encoder 11, for example. As a result, the speed of the DC motor 4 is controlled to a desired speed Ve. The predetermined speed Vc is preferably 70 to 80% of the desired speed Ve.
[0064]
Since the DC motor 4 has a desired speed from time t4, the carriage 3 also has a desired constant speed Ve, and printing processing can be performed.
[0065]
When the printing process is completed and the carriage 3 approaches the target position (see time t5 in FIG. 17B), the position deviation becomes small and the target speed also becomes small. Therefore, the speed deviation, that is, the output of the subtractor 6e is obtained. It becomes negative, the DC motor 4 is decelerated, and stops at time t6.
[0066]
The content of the drive control when the DC motor is the CR motor 4 has been described above, but the content of the drive control is substantially the same when the DC motor is the paper feed motor (PF motor) 1 or the paper feed motor. It will be a thing.
[0067]
Further, the contents of the drive control have been described by taking the energization method for the motor as an example based on current control, but the energization method for the motor may be based on PWM control (voltage control).
[0068]
In this case, the D / A converter 6j in FIG. 16 serves as a PWM signal generation unit, and the driver 5 controls energization to the motor by ON / OFF by the PWM signal. The PWM signal is a signal indicating the ON / OFF ratio in a certain period. That is, when the voltage is 100%, the applied voltage of the driver is supplied to the motor as it is, and when the voltage is 50%, half the voltage applied to the driver is equivalently supplied to the motor.
[0069]
The current value used in the description of the current value control is represented by the PWM signal as an ON / OFF ratio in the PWM control.
[0070]
FIG. 18 is an explanatory diagram schematically showing a schematic configuration of the printer main body and the cutter when the cutter is mounted.
[0071]
The configuration of the printer main body shown in FIG. 18 is based on the assumption that the roll paper 90 is used. Therefore, a roll paper paper feed roller 91 is provided between the paper feed roller 64, the paper feed roller 65, and the driven roller 66. And the driven roller 92 is arrange | positioned. Other configurations of the printer main body are the same as those of the printer described with reference to FIGS. 14 and 15 described above.
[0072]
On the other hand, the cutter is configured such that a circular blade 97 pivotally supported by a support member 96 is disposed on a cutter platen 95, and a cutter paper feed roller 93 and its driven roller 94 are provided on the paper feed side of the circular blade 97. On the paper discharge side of the circular blade 97, a cutter paper discharge roller 98 and its driven roller 99 are disposed.
[0073]
The strip-shaped printing paper 90 a pulled out from the roll paper 90 is sequentially fed by each roller, and printing is performed by the head 9. Thereafter, the belt-shaped printing paper 90a is further sequentially fed by each roller, and the paper feeding operation is temporarily performed when the boundary line between the images in the printed portion of the belt-shaped printing paper 90a comes directly below the circular blade 97 of the cutter. The belt-shaped printing paper 90a is cut for each print image. In this way, the paper feed amount is counted on the printer main body side in order to separate the images in the printed portion of the belt-like printing paper 90a from each other at the boundary line between them. The separated printing paper for one image is fed by the cutter discharge roller 98 and its driven roller 99 and discharged from the cutter discharge port.
[0074]
FIG. 19 is an enlarged perspective view of the periphery of the circular blade 97 of the cutter.
[0075]
The support member 96 that pivotally supports the circular blade 97 is fixed to the timing belt 110. By driving the pulley 111 engaged with the timing belt 110 to rotate, the support member 96 and the circular blade 97 are driven to perform printing. By performing a paper cutting operation, the belt-shaped printing paper 90a can be cut along the cut surface 90x. A dedicated motor may be provided to drive the pulley 111 and the timing belt 110, but the pulley 111 and the timing belt 110 may be driven by a CR motor of the printer body via one or a plurality of gears. .
[0076]
The cutter shown in FIGS. 18 and 19 may be built in the printer body, but is built in a separate housing from the printer body, and the cutter built-in housing is attached to the printer body for use. May be.
[0077]
FIG. 20 is a perspective view showing the external appearance of the cutter built-in housing and the printer main body when the cutter is built in a dedicated housing and the cutter built-in housing is mounted on the printer main body.
[0078]
For example, the cutter can be built in a housing 200 as shown in FIG. 20A. When the cutter is used, as shown in FIG. Attached to the main body 60. Further, when performing the cutting operation of the printed belt-like printing paper that has been pulled out from the roll paper and subjected to image printing, a paper receiving basket 201 as shown in FIG. It is preferable to mount the cut paper on the paper discharge port.
[0079]
By the way, as described above, in a printer with a built-in or attached cutter, in order to prevent a reduction in printing throughput, the cut operation of the printed belt-shaped printing paper and the subsequent image printing operation are performed in parallel. However, since the orientation of the printing paper slightly changes due to the cutter's cutting operation, if the timing of the subsequent image printing operation overlaps with the timing of the cutting operation of the printed belt-like printing paper, white spots or black streaks occur. For example, the quality of subsequent image printing may be reduced.
[0080]
Therefore, in the paper feed DC motor control device and control method for a printer according to the present invention, a correction current value that cancels out the change in the posture of the print paper generated by the print paper cut operation of the cutter is supplied to the paper feed motor during the cut operation. It will be energized. Thereby, even during the printing paper cutting operation of the cutter, the posture of the printing paper is kept constant without being changed, and it is possible to prevent the quality of image printing from being deteriorated.
[0081]
Embodiments of a paper feed DC motor control device and control method for a printer according to the present invention will be described below with reference to the drawings.
[0082]
FIG. 1 is a block diagram showing the configuration of a paper feed DC motor control device for a printer according to the present invention.
[0083]
The paper feed DC motor control device for a printer according to the first embodiment of the present invention uses a correction current value ΔI that cancels out a change in the posture of the printing paper generated by the printing paper cutting operation of the cutter as a type and size of the printing paper. EEPROM 23, which is a storage means storing a table stored for each, and a correction current value ΔI corresponding to the setting of the type and size of the printing paper are read and output, and a cutting operation notification is output when the cutter performs a cutting operation The central processing unit (CPU) 16 and the correction operation value energization command for instructing the energization of the paper feed motor of the correction current value ΔI corresponding to the setting of the type and size of the printing paper are input to the cut operation notification. And a cut operation correction control unit 100 that sometimes outputs.
[0084]
In the block diagram of FIG. 1, the output of the PF motor encoder 13 is connected so as to be input to the cut operation correction control unit 100. This connection is the second embodiment of the present invention to be described later. This configuration is required in the paper feed DC motor control device of the printer according to the embodiment, and is not necessary in the paper feed DC motor control device of the printer according to the first embodiment of the present invention.
[0085]
FIG. 2 is a flowchart showing an outline of the operation of the paper feed DC motor control device of the printer according to the present invention, that is, the procedure of the paper feed DC motor control method of the printer according to the present invention.
[0086]
When printing is started using printing paper that needs to be cut after printing, whether or not the cutting operation by the cutter is started starts to be monitored (step S11), and when the cutting operation is not started, the monitoring is continued as it is. On the other hand, when the cutting operation is started, a control command for canceling the change in the posture of the printing paper generated by the cutting operation is issued (step S12). That is, a control command for energizing the paper feed motor during the cutting operation with a correction current value that cancels out the posture change of the printing paper generated by the cutting operation is issued. In response to the control command, during the cutting operation (step S13), control is performed to energize the paper feed motor with a correction current value that cancels out the change in the posture of the printing paper generated by the cutting operation.
[0087]
FIG. 3 is a flowchart showing a procedure of work to be performed in a preparation stage for carrying out the paper feed DC motor control device and control method for a printer according to the first embodiment of the present invention.
[0088]
In order to implement the paper feeding DC motor control device and control method for a printer according to the first embodiment of the present invention, a correction current value ΔI that cancels out the change in the posture of the printing paper that occurs due to the cutting operation is set to the printing paper. It is necessary to obtain beforehand by experiment, simulation, etc. for each kind and size.
[0089]
First, for each type and size of the printing paper, a deviation amount ΔX due to a change in the posture of the printing paper during the cutting operation is obtained (step S21).
[0090]
When the deviation amount ΔX is obtained, the deviation amount ΔX is canceled, and a correction current value ΔI for maintaining the posture of the printing paper in the state at the start of the cutting operation is obtained for each type and size of the printing paper (step S22).
[0091]
Finally, a table of the correction current value ΔI corresponding to the type and size of the printing paper is created and written in the memory (step S23). As shown in FIG. 1, the EEPROM 23 is used as a memory in the first embodiment.
[0092]
FIG. 4 is a table showing an example of the correction current value ΔI corresponding to the type and size of printing paper.
[0093]
For example, if there are three types of printing paper, three types of X, Y, and Z, and three types of sizes 1, 2, and 3, respectively, there are a total of nine types of printing paper types and sizes. Calculated correction current value ΔI _1X , ΔI _1Y ,. . . ΔI _3Y , ΔI _3Z Are written in a table on the memory as shown in the table of FIG.
[0094]
FIG. 5 shows the operation of the paper feed DC motor control device for the printer according to the first embodiment of the present invention, that is, the procedure of the paper feed DC motor control method for the printer according to the first embodiment of the present invention. It is a flowchart to show. Referring to FIGS. 1 and 5, the operation of the paper feed DC motor control device for the printer according to the first embodiment of the present invention, that is, the paper feed DC for the printer according to the first embodiment of the present invention. The procedure of the motor control method will be specifically described.
[0095]
Before starting printing, first, the type and size of the printing paper used for printing are set (step S31). The setting of the type and size of the printing paper is read by the CPU 16, and the CPU 16 reads the corresponding correction current value ΔI from the EEPROM 23 according to the setting of the type and size of the printing paper and outputs it to the cutting operation correction control unit 100. The cut operation correction control unit 100 stores the input correction current value ΔI. Note that the reading and output of the correction current value ΔI by the CPU 16 may be performed at an arbitrary timing from when the type and size of the printing paper are set until the cutter starts the cutting operation.
[0096]
After setting the type and size of the printing paper and starting printing, it is monitored whether or not the cutting operation of the printing paper by the cutter is executed (step S32). The CPU 16 compares the paper feed amount necessary for the boundary line between adjacent print images to reach the cutter position and the actual paper feed amount, and issues a cut operation command when they match. Therefore, the CPU 16 also monitors the execution of the cutting operation by comparing the paper feed amounts, and outputs a cutting operation notification at the same time when issuing the cutting operation command. When the cutting operation is not executed, the CPU 16 continues monitoring, but when the cutting operation is executed, the CPU 16 outputs a cutting operation notification to the cutting operation correction control unit 100.
[0097]
When the cut operation notification is input, the cutting operation correction control unit 100 uses the stored correction current value ΔI, that is, the correction current value ΔI corresponding to the type and size of the printing paper during the cutting operation. Command to energize. In response to this command, the correction current value ΔI is energized to the paper feed motor during the cutting operation (step S33). The orientation change of the printing paper generated by the printing paper cutting operation of the cutter is canceled by the energization of the correction current value ΔI.
[0098]
Energization of the correction current value ΔI to the paper feed motor is performed until the cutting operation ends (step S34). However, it is not always necessary to continue energization until the end of the cutting operation strictly, and various energization patterns can be appropriately employed as will be described later.
[0099]
When the cutting operation is finished, the series of cutting operation correction control is also finished. However, when there is a possibility that the printing operation is continued and the cutting operation is performed again, the process returns to step S32 and the series of cutting operation correction control is performed. repeat.
[0100]
FIG. 6 is a graph showing an example of the energization pattern of the correction current value ΔI.
[0101]
Like the energization pattern C0, the cutting operation end time t from the cutting operation start time (t = 0). _e The correction current value ΔI may continue to be supplied until a predetermined time t from the cut operation start time as in the case of the pulse-like energization pattern C1. ₁ (T ₁ <T _e ) May be energized with the correction current value ΔI. Also, like the energization pattern C2, the cutting operation end time t from the cutting operation start time. _e The correction current value may be linearly decreased from ΔI to 0 during the period until or until the cutting operation end time t from the cutting operation start time as in the energization pattern C3. _e The correction current value may be decreased exponentially from ΔI to 0 during the period up to. The decrease pattern of the current value is not necessarily a linear or exponential decrease pattern, and an arbitrary decrease pattern can be adopted as appropriate.
[0102]
As described above, in the paper feed DC motor control device and control method for a printer according to the first embodiment of the present invention, the correction current value ΔI set in advance according to the type and size of the print paper is set to the cutter. Since the paper feed motor is energized during the printing paper cutting operation to cancel the posture change of the printing paper caused by the operation, the cutting operation of the printed belt-like printing paper and the subsequent image printing operation are performed in parallel. Even if it is performed, it is possible to prevent the quality of the subsequent image printing from being deteriorated.
[0103]
Next, a paper feed DC motor control device and control method for a printer according to a second embodiment of the present invention will be described. A paper feed DC motor control device for a printer according to a second embodiment of the present invention will also be described with reference to FIG.
[0104]
The paper feed DC motor control device for a printer according to the second embodiment of the present invention includes a central processing unit (CPU) 16 that outputs a cut operation notification when the cutter performs a cut operation, and a cut operation notification. The cutting operation correction control unit that monitors the output encoder pulse of the paper feed motor encoder 13 and outputs a correction current value energization command that commands energization of the paper feed motor with a correction current value ΔI that cancels the change in the output encoder pulse. 100.
[0105]
In the paper feed DC motor control device and control method for a printer according to the second embodiment of the present invention, the output encoder pulse of the paper feed motor encoder 13 is monitored, and the correction for canceling the change in the output encoder pulse is performed. Since the cutting operation correction control is performed by instructing energization of the paper feed motor having the current value ΔI, the output of the PF motor encoder 13 is connected to the cutting operation correction control unit 100. Further, unlike the first embodiment, the EEPROM 23 is not necessary.
[0106]
FIG. 7 shows the operation of the paper feed DC motor control apparatus for a printer according to the second embodiment of the present invention, that is, the procedure of the paper feed DC motor control method for the printer according to the second embodiment of the present invention. It is a flowchart to show. Referring to FIGS. 1 and 7, the operation of the paper feed DC motor control device for the printer according to the second embodiment of the present invention, that is, the paper feed DC for the printer according to the second embodiment of the present invention. The procedure of the motor control method will be specifically described.
[0107]
When printing is started, it is monitored whether or not the cutting operation of the printing paper by the cutter is executed (step S41). The method of monitoring the cut operation execution and the cut operation notification by the CPU 16 is the same as in the first embodiment. When the cut operation is not executed, the CPU 16 continues monitoring, but the cut operation is executed. Outputs a cut operation notification to the cut operation correction control unit 100.
[0108]
When the cutting operation notification is input, the cutting operation correction control unit 100 starts monitoring the output encoder pulse of the paper feed motor encoder 13 (step S42). If the output encoder pulse does not change, monitoring is continued as it is. However, when the output encoder pulse changes (step S43), the cut operation correction control unit 100 cancels the change in the output encoder pulse. Command the paper feed motor to be energized. In response to this command, the correction current value ΔI is energized to the paper feed motor (step S44). The orientation change of the printing paper generated by the printing paper cutting operation of the cutter is canceled by the energization of the correction current value ΔI.
[0109]
Further, if the cutting operation has not been completed yet, the operation procedure from step S42 to S44 is repeated (step S45). When the cutting operation is completed, a series of cutting operation correction control is also completed, but further printing is performed. If there is a possibility that the cutting operation will be performed again, the process returns to step S41 and the series of cutting operation correction control is repeated.
[0110]
As described above, in the paper feed DC motor control device and control method for a printer according to the second embodiment of the present invention, the correction current value ΔI that cancels the change in the output encoder pulse of the paper feed motor encoder is calculated as follows: Since the paper feed motor is energized during the cutting operation of the printing paper by the cutter to cancel the change in the posture of the printing paper caused by the operation, the cutting operation of the printed belt-like printing paper and the subsequent image printing operation are performed. Even if it is performed in parallel, it is possible to prevent the quality of subsequent image printing from being deteriorated.
[0111]
In the description of each embodiment of the paper feed DC motor control device and control method for a printer according to the present invention, the contents of drive control have been described by taking the energization method for the motor as an example based on current control. However, the energization method to the motor may be based on PWM control (voltage control).
[0112]
FIG. 8 is an explanatory diagram showing an external configuration of a recording medium on which a computer program for executing a paper feeding DC motor control method for a printer according to the present invention is recorded and a computer system in which the recording medium is used. It is a block diagram which shows the structure of the computer system shown in FIG.
[0113]
A computer system 70 shown in FIG. 8 includes a computer main body 71 housed in a mini-tower type housing, a display device 72 such as a CRT (Cathode Ray Tube), plasma display, liquid crystal display device, etc. It comprises a printer 73 as an output device, a keyboard 74a and a mouse 74b as input devices, a flexible disk drive device 76, and a CD-ROM drive device 77. FIG. 9 is a block diagram showing the configuration of the computer system 70. An internal memory 75 such as a RAM (Random Access Memory), a hard disk drive unit 78, and the like are included in a housing in which the computer main body 71 is housed. An external memory is further provided. A recording medium on which a computer program for executing the paper feeding DC motor control method for a printer according to the present invention is recorded is used in the computer system 70. As the recording medium, for example, a flexible disk 81 and a CD-ROM (Read Only Memory) 82 are used. In addition, an MO (Magneto Optical) disk, a DVD (Digital Versatile Disk), other optical recording disks, and a card memory. Alternatively, a magnetic tape or the like may be used.
[0114]
【The invention's effect】
According to the paper feed DC motor control device and control method of a printer according to the present invention, the amount of deviation due to the change in the posture of the printing paper generated by the printing paper cutting operation of the cutter is canceled, and the posture of the printing paper is started when the cutting operation is started. In order to maintain this state, a correction current value for a driving operation that cancels out the deviation amount obtained in advance for each type and size of printing paper is supplied to the paper feed DC motor according to the type and size of printing paper. Since energization is commanded between immediately before the start of the cutting operation and immediately after the end of the cutting operation, even if the cutting operation of the printed belt-like printing paper and the subsequent image printing operation are performed in parallel, the subsequent image It is possible to prevent printing quality from being lowered.
[0115]
According to the recording medium of the computer program according to the present invention, since the computer program for executing the paper feeding DC motor control method for the printer according to the present invention in the computer system is recorded, the paper feeding for the printer according to the present invention is recorded. The same effect as described above can be obtained by executing the DC motor control method in a computer system.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a paper feed DC motor control device of a printer according to the present invention.
FIG. 2 is a flowchart showing an outline of an operation of a paper feed DC motor control device for a printer according to the present invention, that is, a procedure of a paper feed DC motor control method for a printer according to the present invention.
FIG. 3 is a flowchart showing a procedure of work to be performed in a preparation stage for carrying out the paper feed DC motor control device and control method for a printer according to the first embodiment of the present invention.
FIG. 4 is a table showing an example of a correction current value ΔI table corresponding to the type and size of printing paper.
FIG. 5 is a flowchart showing a procedure of a paper feed DC motor control method for the printer according to the first embodiment of the invention.
FIG. 6 is a graph showing an example of an energization pattern of a correction current value ΔI.
FIG. 7 is a flowchart showing a procedure of a paper feed DC motor control method for a printer according to a second embodiment of the present invention.
FIG. 8 is an explanatory diagram showing an external configuration of a recording medium on which a program for executing a paper feed DC motor control method for a printer according to the present invention is recorded and a computer system in which the recording medium is used.
9 is a block diagram showing the configuration of the computer system shown in FIG.
FIG. 10 is a block diagram illustrating a schematic configuration of an inkjet printer.
FIG. 11 is a perspective view showing a configuration around the carriage 3 of the ink jet printer.
12 is an explanatory diagram schematically showing the configuration of a linear encoder 11 attached to a carriage 3. FIG.
FIG. 13 is a timing chart showing waveforms of two output signals of the encoder 11 during CR motor forward rotation and reverse rotation.
FIG. 14 is a perspective view showing portions related to paper feeding and paper detection.
FIG. 15 is a perspective view showing in detail a portion related to paper feeding of the printer.
FIG. 16 is a block diagram showing a configuration of a DC unit 6 which is a DC motor control device.
FIG. 17 is a graph showing the motor current and motor speed of the DC motor 4 controlled by the DC unit 6;
FIG. 18 is an explanatory view schematically showing a schematic configuration of a printer main body and a cutter when the cutter is mounted.
FIG. 19 is an enlarged perspective view of the periphery of the circular blade 97 of the cutter.
FIG. 20 is a perspective view showing the external appearance of the cutter built-in housing and the printer main body when the cutter is built in a dedicated housing and the cutter built-in housing is attached to the printer main body.
[Explanation of symbols]
1 Paper feed motor (PF motor)
2 Paper feed driver
3 Carriage
4 Carriage motor (CR motor)
5 Carriage motor driver (CR motor driver)
6 DC unit
6a Position calculator
6b subtractor
6c Target speed calculation means
6d Speed calculator
6e Subtractor
6f proportional element
6g integral element
6h Differential element
6j D / A converter
7 Pump motor
8 Pump motor driver
9 Recording head
10 Head driver
11 Linear encoder
12 Code plate
13 Encoder (Rotary encoder)
14 Code board for rotary encoder
15 Paper detection sensor
16 CPU
17 Timer IC
18 Host computer
19 Interface section
20 ASIC
21 PROM
22 RAM
23 EEPROM
25 platen
30 pulley
31 Timing belt
32 Guide member for carriage motor
34 Ink cartridge
35 Capping device
36 Pump unit
37 cap
50 chart paper
60 Printer
61 Paper feed slot
62 Outlet
64 Paper feed roller
65 Paper feed roller
66 Followed Roller
67a Large gear
67b Intermediate gear
67c Paper discharge gear
68 Paper discharge roller
69 Followed Roller (Giza Roller)
83 Smap axis
84 Platen
87 Small gear
88 small gear
89 Holder
90 roll paper
91 Roll paper paper feed roller
92 Followed roller
93 Cutter paper feed roller
94 Followed Roller
95 Platen for cutter
97 Circular blade support member
97 Circular blade
98 Cutter discharge roller
99 Followed roller
100 cut operation correction controller
110 Timing belt
111 pulley
200 Built-in cutter housing
201 Paper receiving basket

Claims (17)

  In order to offset the deviation due to the change in the posture of the printing paper caused by the cutting paper cutting operation of the cutter and maintain the posture of the printing paper in the state at the start of the cutting operation, it is obtained in advance for each type and size of the printing paper. Further, it is instructed that the correction current value for the driving operation for canceling the deviation amount is energized to the paper feed DC motor according to the type and size of the printing paper immediately before the start of the cutting operation and immediately after the end of the cutting operation. A paper feed DC motor control device for a printer, comprising a cut operation correction control unit. In order to offset the deviation due to the change in the posture of the printing paper generated by the cutter's printing paper cutting operation and maintain the printing paper posture in the state at the start of the cutting operation, it is obtained in advance for each type and size of the printing paper. A memory for storing and holding a correction current value for a driving operation that cancels the deviation amount;
A central processing unit that reads out and outputs the correction current value corresponding to the setting of the type and size of printing paper from the memory, and outputs a cutting operation notification when the cutter performs the cutting operation;
A cut operation correction control unit that outputs a correction command value energization command for instructing energization to the paper feed DC motor of the correction command value corresponding to the setting and type of printing paper when the cut operation notification is input When,
A paper feed DC motor control device for a printer, comprising:   3. The printer paper according to claim 2, wherein the energization of the correction command value to the paper feed DC motor is an energization of a constant correction command value from immediately before the start time of the cutting operation to immediately after the end time. Feed DC motor controller.   The energization of the correction command value to the paper feed DC motor is an energization of a pulse-shaped correction command value from immediately before the start time of the cut operation to a predetermined time before the end time of the cut operation. A paper feed DC motor control device for a printer according to claim 2.   The energization of the correction command value to the paper feed DC motor is an energization for decreasing the correction command value from an initial value to 0 in a period from immediately before the start time of the cut operation to immediately after the end time. Item 3. A paper feed DC motor control device for a printer according to Item 2.   6. The paper feed DC motor control device for a printer according to claim 5, wherein the decrease pattern of the correction command value is a linear decrease pattern.   6. The paper feed DC motor control device for a printer according to claim 5, wherein the decrease pattern of the correction command value is an exponential decrease pattern. A central processing unit that outputs a cutting action notification when the cutter performs a printing paper cutting action;
In order to detect the amount of deviation due to the change in the posture of the printing paper generated by the printing paper cutting operation of the cutter, the output encoder pulse of the paper feed DC motor encoder is monitored according to the cutting operation notification, and the change in the output encoder pulse A cut operation correction control unit that outputs a correction command value energization command for instructing energization to the paper feed DC motor of a correction command value for a driving operation that cancels the deviation amount represented by:
A paper feed DC motor control device for a printer, comprising:   In order to offset the deviation due to the change in the posture of the printing paper caused by the cutting paper cutting operation of the cutter and maintain the posture of the printing paper in the state at the start of the cutting operation, it is obtained in advance for each type and size of the printing paper. Further, it is instructed that the correction current value for the driving operation for canceling the deviation amount is energized to the paper feed DC motor according to the type and size of the printing paper immediately before the start of the cutting operation and immediately after the end of the cutting operation. A paper feed DC motor control method for a printer. In order to offset the deviation due to the change in the posture of the printing paper generated by the cutter's printing paper cutting operation and maintain the printing paper posture in the state at the start of the cutting operation, it is obtained in advance for each type and size of the printing paper. A selection step of selecting a correction current value for a driving operation that cancels the deviation amount corresponding to the setting of the type and size of the printing paper;
A notification step for notifying the cutting operation when the cutter performs the printing paper cutting operation;
A correction control step for performing a correction command value energization command for commanding energization of the paper feed DC motor of the selected correction command value when the cut operation notification is input;
A paper feed DC motor control method for a printer, comprising:   The paper of the printer according to claim 10, wherein energization of the correction command value to the paper feed DC motor is energization of a constant correction command value from immediately before the start time of the cutting operation to immediately after the end time. Feed DC motor control method.   The energization of the correction command value to the paper feed DC motor is an energization of a pulse-shaped correction command value from immediately before the start time of the cut operation to a predetermined time before the end time of the cut operation. The paper feed DC motor control method for a printer according to claim 10.   The energization of the correction command value to the paper feed DC motor is an energization for decreasing the correction command value from an initial value to 0 in a period from immediately before the start time of the cut operation to immediately after the end time. Item 11. A paper feed DC motor control method for a printer according to Item 10.   14. The paper feed DC motor control method for a printer according to claim 13, wherein the decrease pattern of the correction command value is a linear decrease pattern.   14. The paper feed DC motor control method for a printer according to claim 13, wherein the decrease pattern of the correction command value is an exponential decrease pattern. A notification step for notifying the cutting operation when the cutter performs the printing paper cutting operation;
A monitoring step of monitoring an output encoder pulse of a paper feed DC motor encoder in response to the notification of the cutting operation in order to detect a deviation amount due to a change in posture of the printing paper generated by a printing paper cutting operation of the cutter;
A correction control step of performing a correction command value energization command for instructing energization of the paper feed DC motor for a correction operation value for a driving operation that cancels out the deviation amount represented by the change in the output encoder pulse;
A paper feed DC motor control method for a printer, comprising:   17. A recording medium for a computer program, wherein a computer program for executing the paper feeding DC motor control method for a printer according to claim 9 in a computer system is recorded.

Images