JP2005200222A - PRINT CONTROL DEVICE, CONTROL METHOD, AND RECORDING MEDIUM CONTAINING PRINT CONTROL PROGRAM - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make printing near the edge of paper.
A position detector 6a that detects the position of a paper driven by a paper feed motor based on an output pulse of an encoder 13 that rotates according to the rotation of the paper feed motor 1, and a target value and position detection of the paper feed amount. And a drive control unit that drives and controls the paper feed motor by adding a current value to the paper feed motor based on the output of the printing unit, and after the paper feed amount reaches the target value Based on the output pulse of the encoder, the paper movement is stopped, or a current value signal for moving the paper in the direction opposite to the normal paper feeding direction is generated, and the paper feeding motor is generated based on the current value signal. Is configured to be driven and controlled by the drive control unit.
[Selection] Figure 1

Description

  The present invention relates to a print control apparatus, a print control method, and a recording medium on which a print control program is recorded, and is particularly used for paper feed control.

  A conventional print control apparatus will be described with reference to FIGS. This print control apparatus is used in an ink jet printer, and FIG. 5 shows a schematic configuration of the ink jet printer.

  The ink jet printer includes a paper feed motor (hereinafter also referred to as a PF motor) 1 that feeds paper, a paper feed motor driver 2 that drives the paper feed motor 1, a carriage 3, and a carriage motor that drives the carriage 3. (Hereinafter also referred to as a CR motor) 4, a CR motor driver 5 that drives the carriage motor 4, a DC unit 6, a pump motor 7 that controls the suction of ink to prevent clogging, and the pump motor 7 A pump motor driver 8 that drives the head 9, a head 9 that is fixed to the carriage 3 and discharges ink onto the printing paper 50, a head driver 10 that drives and controls the head 9, and a linear encoder 11 that is fixed to the carriage 3. , A code plate 12 having slits formed at predetermined intervals, and a rotary encoder for the PF motor 1 , A paper detection sensor 15 that detects the end position of the paper being printed, a CPU 16 that controls the entire printer, a timer IC 17 that periodically generates an interrupt signal for the CPU 16, and a host computer 18 And an ASIC 20 for controlling the print resolution and the drive waveform of the head 9 based on the print information sent from the host computer 18 via the IF 19. A PROM 21, RAM 22 and EEPROM 23 used as work areas and program storage areas of the ASIC 20 and CPU 16, a platen 25 that supports the paper 50 being printed, and a transport roller 27 that is driven by the PF motor 1 to transport the print paper 50. And the prop attached to the rotary shaft of the CR motor 4 And Li 30, and a timing belt 31 driven by the pulley 30, the.

  The DC unit 6 controls the drive of 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. Both the paper feed motor 1 and the CR motor 4 are DC motors.

  The configuration around the carriage 3 of this ink jet printer is shown in FIG.

  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. On the surface of the carriage 3 facing the printing paper, there is provided a recording head 9 comprising a nozzle row for ejecting black ink and a nozzle row for ejecting color ink. Each nozzle row is supplied with ink from the ink cartridge 34. Characters and images are printed by ejecting ink droplets onto printing paper.

  In the non-printing area of the carriage 3, a capping device 35 for sealing the nozzle openings of the recording head 9 during non-printing and a pump unit 36 having the pump motor 7 shown in FIG. 5 are provided. When the carriage 3 moves from the printing area to the non-printing area, the capping device 35 moves upward by contacting a lever (not shown) and seals the head 9.

  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.

Next, the configuration of the linear encoder 11 attached to the carriage 3 is shown in FIG. The encoder 11 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 11f _A and 11f _B.

  When the voltage Vcc is applied to both ends of the light emitting diode 11a via a resistor, light is emitted from the light emitting diode 11a. This light is collimated by the collimator lens 11b and passes through the code plate 12. The code plate 12 has a configuration in which slits are provided at predetermined intervals (for example, 1/180 inch (= 1/180 × 2.54 cm)).

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 11f _A and 11f _B , and the comparison result is output as a pulse. Pulses ENC-A and ENC-B output from the comparators 11 f _A and 11 f _{B are} output from the encoder 11.

  The phases of the pulse ENC-A and the pulse ENC-B are different by 90 degrees. When the CR motor 4 is rotating forward, that is, when the carriage 3 is moving in the main scanning direction, the phase of the pulse ENC-A is advanced by 90 degrees from the pulse ENC-B as shown in FIG. As shown in FIG. 8B, the encoder 4 is configured such that the phase of the pulse ENC-A is delayed by 90 degrees from the pulse ENC-B. One period T of the pulse corresponds to a slit interval (for example, 1/180 inch (= 1/180 × 2.54 cm)) of the code plate 12, and is equal to a time for the carriage 3 to move the slit interval.

  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 encoder 13 for the PF motor 1 is 1/180 inch (= 1/180 × 2.54 cm). When rotated by the 1 slit interval, the paper is fed by 1/1440 inch (= 1/1440 × 2.54 cm).

  Next, the position of the paper detection sensor 15 shown in FIG. 5 will be described with reference to FIG. In FIG. 9, the paper 50 inserted into the paper feed insertion slot 61 of the printer 60 is fed into the printer 60 by a paper feed roller 64 driven by a paper feed motor 63. The leading edge of the 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 a paper feed roller 65 and a driven roller 66 driven by the PF motor 1.

  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 paper 50 is detected by the paper detection sensor 15. Then, the gear 67c driven by the PF motor 1 drives the gear 67c via the gear 67b, whereby the paper discharge roller 68 and the driven roller 69 are rotationally driven, and the paper 50 that has finished printing is discharged into the paper discharge port. 62 is discharged to the outside. A sign plate of the encoder 13 is attached to the rotation shaft of the paper feed roller 65.

  Next, control of the PF motor 1 of this conventional ink jet printer will be described with reference to FIGS. The PF motor 1 is controlled by a DC unit 6. The DC unit 6 has a position counter 6a, a subtractor 6b, a target speed calculator 6c, a speed calculator 6d, and a subtractor as shown in FIG. 6e, a proportional element 6f, an integral element 6g, a differential element 6h, an adder 6i, a D / A converter 6j, a timer 6k, and an acceleration controller 6m.

  The position counter 6a detects the rising edge and falling edge of each of the output pulses ENC-A and ENC-B of the encoder 13, counts the number of detected edges, and based on the counted value, the PF motor 1 Calculate the amount of paper to be sent. This count is incremented by "+1" when one edge is detected when the PF motor 1 is rotating forward, and is "-1" when one edge is detected when rotating reversely. Is added. The period of each of the pulses ENC-A and ENC-B is equal to the slit interval of the code plate, and the pulse ENC-A and the pulse ENC-B are different in phase by 90 degrees. For this reason, the count value “1” of the count corresponds to ¼ of the slit interval of the code plate of the encoder 13. Further, when the PF motor 1 is rotated by one slit interval, paper is fed by 1/1440 inch (= 1/1440 × 2.54 cm), so that the count value of the position counter 6a is reduced to 1/4 × 1/1440. By multiplying by inch (= 1/4 × 1/1440 × 2.54 cm), the paper feed amount from the position corresponding to the count value “0” of the PF motor 1, that is, the start start position can be obtained. At this time, the resolution of the encoder 13 is 1/5760 inch (= 1/5760 × 2.54 cm).

  The subtractor 6b calculates a position deviation between the target position and the count value of the position counter 6a.

  The target speed calculator 6c calculates the target speed of the PF motor 1 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).

  The speed calculation unit 6 d calculates the speed of the PF motor 1 based on the output pulses ENC-A and ENC-B of the encoder 13. 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 13 are detected, and the time interval between the edges is counted by, for example, a timer counter. When this count value is T, the speed is proportional to 1 / T.

  The subtractor 6e calculates a speed deviation between the target speed and the actual speed of the PF motor 1 calculated by the speed calculation unit 6d.

  The proportional element 6f multiplies the speed deviation by a constant Gp and outputs the multiplication result. The integrating 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 every period of the output pulse ENC-A of the encoder 13 in synchronization with, for example, the rising edge of the output pulse ENC-A.

  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 PF motor 1 is sent to the D / A converter 6j and converted into an analog current. The PF motor 1 is driven by the driver 2 based on the analog current.

  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.

  The timer 6k generates a timer interrupt signal every predetermined time based on the clock signal sent from the CPU 16.

  Every 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 PF motor 1 at the time of acceleration is obtained as the D / A converter 6j. Sent to. 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 PF motor 1 is driven by the driver 2 based on this analog current.

The driver 2 includes, for example, four transistors, and each of the transistors is turned on or off based on the output of the D / A converter 6j. (A) An operation mode in which the PF motor 1 is rotated forward or reverse (b ) Regenerative brake operation mode (short brake operation mode, that is, a mode in which the stop of the PF motor 1 is maintained)
(C) The configuration is such that a mode for stopping the PF motor 1 can be performed.

Next, the operation of the DC unit 6 will be described with reference to FIGS. 11 (a) and 11 (b). When a start command signal for starting the PF motor 1 is sent from the CPU 16 to the DC unit 6 when the PF motor 1 is stopped, the start initial current value I ₀ is sent from the acceleration control unit 6m to the D / A converter 6j. . Note that the start initial current value I ₀ is sent to the acceleration controller 6m from CPU16 together with the start-up command signal. The current value I ₀ is converted into an analog current by the D / A converter 6j and sent to the driver 2, and the PF motor 1 starts to be started by the driver 2 (see FIGS. 11A and 11B).

After receiving the start command signal, a timer interrupt signal is generated from the timer 6k every predetermined time. Acceleration controller 6m each time receiving a timer interrupt signal, starts a predetermined current value to an initial current value I ₀ by integrating (e.g. 20 mA), 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 2. Then, the PF motor 1 is driven by the driver 2 and the speed of the PF motor 1 is increased so that the value of the current supplied to the PF motor 1 becomes the integrated current value (see FIG. 11B). For this reason, the current value supplied to the PF motor 1 is stepped as shown in FIG.

  At this time, the PID control system is also operating, but the D / A converter 6j selects and captures the output of the acceleration control unit 6m.

Integration process of the current value of the acceleration controller 6m is carried out until the integrated current value becomes a constant current value I _S. When the current value obtained by integrating at time t ₁ becomes the predetermined value I _S, the acceleration controller 6m stops the integration processing, and supplies a constant current I _S to the D / A converter 6j. Thus the value of the current supplied to the PF motor 1 is driven by the driver 2 so that the current value I _S (see FIG. 11 (a)).

In order to prevent the speed of the PF motor 1 from overshooting, when the PF motor 1 reaches a predetermined speed V ₁ (time t ₂ ), the current supplied to the PF motor 1 is reduced. The acceleration control unit 6m controls. At this time PF speed of the motor 1 further increases, but the speed of the PF motor 1 reaches a predetermined speed _{v c} (see time _{t 3} in FIG. 11 (b)), D / A converter 6j is, PID control system Output, that is, the output of the adder 6i is selected, and PID control is performed.

That is, the target speed is calculated based on the position deviation between the target position and the count value of the counter 6a, and the proportional element 6f is calculated based on the speed deviation between the target speed and the actual speed obtained from the output of the encoder 13. The integral element 6g and the differential element 6h operate to perform proportional, integral and differential calculations, respectively, and the PF motor 1 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 13, for example. Thus the speed of the PF motor 1 is controlled in so that such a desired speed v _e. Incidentally, it is preferable that the predetermined speed _{v c} 70 to 80% of the value of desired speed _{v e.}

PF motor 1 from the time _{t 4} is the desired speed _{v e.} Thereafter, the PF motor 1 approaches the target position (see time _{t 5} in FIG. 11 (b)), deceleration of the PF motor 1 is carried out, the PF motor 1 is stopped at time _{t 6.}

  In the conventional print control apparatus configured as described above, the paper feed is performed by the paper feed roller 65 and the driven roller 66 driven by the PF motor 1 as described with reference to FIG. The driven roller 66 is configured to press the paper 50 against the paper feed roller 65 by a spring 80 during paper feed as shown in FIG.

  On the other hand, there is a demand for printing up to the end of the paper 50. For this purpose, the end of the paper 50 is bounded by a paper feed roller 65 and a driven roller 66 at a predetermined range x shown in FIG. (A range of 25 mm).

  However, in the conventional printing apparatus, since the driven roller 66 is configured to be pressed against the paper feed roller 65 by the spring 80, the paper feed is performed so that the end of the paper 50 is positioned within the predetermined range. In the case of breakage, a force F such that the paper 50 is fed out by the spring 80 acts on the paper 50 as shown in FIG. For this reason, the paper 50 is fed out from between the paper feed roller 65 and the driven roller 66, and there arises a problem that printing near the end of the paper 50 cannot be performed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a print control apparatus and a print control method capable of printing up to the end of paper.

  A printing control apparatus according to the present invention includes a position detection unit that detects the position of a paper driven by the paper feed motor based on an output pulse of an encoder that rotates according to the rotation of the paper feed motor, and a target value of the paper feed amount. A print control apparatus comprising: a drive control unit that drives and controls the paper feed motor by adding a current value to the paper feed motor based on the output of the position detection unit. Based on the output pulse of the encoder after reaching the value, the paper movement is stopped or a current value signal for moving the paper in the direction opposite to the normal paper feeding direction is generated. Based on this, the paper feed motor is configured to be driven and controlled by the drive control unit.

  The encoder output pulses are counted when the paper is moving in the direction opposite to the normal paper feed direction after the paper feed amount reaches the target value, and the count value becomes a predetermined value. A pulse counter that outputs a command signal when the command signal is received, and a current value signal that generates the current value signal when the command signal is received or when the paper is moving in a direction opposite to the normal paper feed direction And a generator.

  The current value signal generator is configured to detect, based on the output of the encoder, whether the paper is stopped or moving in a direction opposite to a normal paper feeding direction, the command signal or the A current value determining unit that determines and outputs the current value signal based on the detection result of the detecting unit may be provided.

  The current value determining means outputs the same current value signal as the previous current value signal when the paper is stopped, and the paper is moving in the direction opposite to the normal paper feeding direction. May be configured to generate a current value signal having a smaller absolute value than the previous one but the same sign.

  Further, the printing control method according to the present invention may stop the movement of the paper based on the output pulse of the encoder that rotates according to the rotation of the paper feed motor after the paper feed amount reaches the target value, or The method includes a step of generating a current value signal for moving the paper in a direction opposite to the paper feed direction, and a step of driving and controlling the paper feed motor based on the current value signal.

  The step of generating the current signal includes a step of counting output pulses of the encoder when the paper is moving in a direction opposite to a normal paper feeding direction, and a count value of the output pulse is set to a predetermined value. A step of generating the current value signal when the current value signal is reached.

  The recording medium on which the print control program according to the present invention is recorded stops the movement of the paper based on the output pulse of the encoder that rotates according to the rotation of the paper feed motor after the paper feed amount reaches the target value. Or a procedure for generating a current value signal for moving the paper in a direction opposite to a normal paper feeding direction, and a procedure for driving and controlling the paper feeding motor based on the current value signal. The steps of generating the encoder are the steps of counting the output pulses of the encoder when the paper is moving in the direction opposite to the normal paper feeding direction, and the count value of the output pulses reaches the predetermined value. And a procedure for generating a current value signal.

  According to the present invention, the end of the paper can be held within a predetermined range between the paper feed roller and the driven roller, and printing can be performed up to the vicinity of the end of the paper.

  An embodiment of a print control apparatus according to the present invention will be described with reference to FIGS. The configuration of the print control apparatus of this embodiment is shown in FIG. The print control apparatus 6 of this embodiment has a configuration in which a pulse counter 6p and a current value signal generator 6q are added to the conventional print control apparatus 6 shown in FIG. Since the components other than the pulse counter 6p and the current value signal generator 6q have already been described with reference to FIG.

  The configuration and operation of the pulse number counter 6p and the current value signal generator 6q will be described with reference to FIGS.

  As shown in FIG. 2, the current value signal generator 6 q is configured to include a current value determination unit 71 and a detection unit 72.

  Now, a target position is given to the DC unit 6 so that the end of the paper 50 is located within a predetermined range (range x shown in FIG. 13) between the paper feed roller 65 and the driven roller 66 after the paper feed. Suppose that is running. As the end of the paper 50 approaches the target position within a predetermined range between the paper feed roller 65 and the driven roller 66, the positional deviation, which is the output of the subtractor 6b, approaches zero.

If the position deviation which is the output of the subtracter 6b becomes zero, i.e., when it reaches the target position (see time t ₀ in FIG steps F1 and Figure 3 3), the output pulse ENC-A of the pulse number counter 6p encoder 13 ENC-B starts counting the number of rising and falling edges (see step F2 in FIG. 3). If the count value is less than a predetermined value (for example, 5) even after a predetermined time has elapsed (see step F3), the paper 50 is held within a predetermined range between the paper feed roller 65 and the driven roller 66. The control is terminated and the process proceeds to the printing process.

  The reason why the predetermined value is set to 5, for example, is that it is difficult for the DC motor to stop at a position deviation of zero, and it is common to stop the position deviation within a range of ± 3.

Count value becomes a predetermined value (= 5) or more (see time t ₁ in FIG. 3), the command signal is sent from the pulse counter 6p to the current value signal generator current determining means 71 of 6q. Then, a current value signal that becomes a predetermined current value I ₁ required for the PF motor 1 to rotate in the reverse direction is determined from the current value determining means 71 of the current value signal generating unit 6q, and is supplied to the D / A converter 6j. Sent (see step F4 in FIG. 2). The predetermined current value I ₁ is determined according to the thickness of the paper 50, for example. For example, the predetermined current value I ₁ is a minimum value among the absolute values of the current value at which the PF motor 1 rotates in the reverse direction. Find out by conducting an experiment.

The current value signal having the predetermined current value I ₁ is converted into an analog current command value by the D / A converter 6 j and sent to the driver 2. Then, the PF motor 1 is driven so that the current value applied to the PF motor 1 by the driver 2 becomes I ₁ . At this time, the adder 6i and the acceleration control unit 6m are not operating, and their outputs are all zero. The current value signal signal having the predetermined current value I ₁ is a current value signal when the output pulse ENC-B of the encoder 13 is at “H” level, that is, from time t ₁ to time t ₂ shown in FIG. Output from the generator 6q.

  As a result, the PF motor 1 is reversed or stopped. Whether or not the PF motor 1 has stopped is detected by the detection means 72 of the current value signal generator 6q based on the output pulse of the encoder 13 (see step F5 in FIG. 3).

If it is determined that the current has not stopped, a current value signal having a current value I ₂ (| I ₂ | <| I ₁ |) having an absolute value smaller than that of the previous but the same sign is generated by the current value signal generator 6q. is determined by a current value signal determining section 71 (see time _{t 3} in FIG. 4), it is sent to the D / a converter 6j (see the step of FIG. 3 F6). Thus the current to be added to the PF motor 1 is controlled so that the current value I _2. Incidentally, during when the current value signal as a current value _{I 2} is the output pulse ENC-B is "H" level of the encoder 13, i.e. from the time _{t 3} when 4 to _{t 4,} the current value signal generator 6q Is output from.

Thereafter, the process returns to step F5 and the above steps are repeated until the paper 50 stops. If it is determined in step F5 that the sheet has stopped, it is considered that the end of the paper 50 is held within a predetermined range (range x shown in FIG. 13) between the paper feed roller 65 and the driven roller 66, and the detection means 72 signal into a current value determining means 71 is sent from the current value determining means 71 continues to output a current value signal (see time t ₅ shown in FIG. 4).

  The current value determined by the current value determining means 71 is preferably obtained in advance by experiments or the like, and the obtained value is stored in a table and taken out from this table.

  As described above, according to the present embodiment, the end of the paper 50 can be held within a predetermined range between the paper feed roller 65 and the driven roller 66, and printing can be performed to the vicinity of the end of the paper. .

  Next, an embodiment of a recording medium on which a motor control program according to the present invention is recorded will be described with reference to FIGS. FIGS. 14 and 15 are a perspective view and a block diagram showing an example of a computer system 130 in which a recording medium recording a motor control program of the present embodiment is used. 14, a computer system 130 includes a computer main body 131 including a CPU, a display device 132 such as a CRT, an input device 133 such as a keyboard and a mouse, and a printing device 134 that executes printing.

  As shown in FIG. 15, the computer main body 131 includes an internal memory 135 composed of a RAM and a memory unit 136 that can be built in or externally attached. The memory unit 136 is a flexible or floppy disk (FD). A drive 137, a CD-ROM drive 138, and a hard disk drive (HD) unit 139 are installed. As shown in FIG. 14, the recording medium 140 used in these memory units 136 includes a flexible disk or floppy disk (FD) 141 used by being inserted into a slot of the FD drive 137, and a CD-ROM drive 138. The CD-ROM 142 or the like used is used.

  As shown in FIGS. 14 and 15, the recording medium 140 used in a general computer system may be an FD 141 or a CD-ROM 142, but this embodiment particularly relates to a control program for the printing apparatus 134. Therefore, for example, the motor control program of the present invention may be recorded in the ROM chip 143 as a nonvolatile memory built in the printing apparatus 134.

  In the recording medium 140 of the present embodiment, the movement of the paper is stopped based on the output pulse of the encoder that rotates according to the rotation of the paper feed motor after the paper feed amount reaches the target value, or the normal amount A procedure for generating a current value signal for moving the paper in a direction opposite to the paper feed direction, and a procedure for driving and controlling the paper feed motor based on the current value signal, The procedure for counting the output pulses of the encoder when the paper is moving in the direction opposite to the normal paper feed direction, and the current value signal is generated when the count value of the output pulses reaches a predetermined value. And at least a procedure to perform.

1 is a block diagram showing the configuration of an embodiment of a print control apparatus according to the present invention. The block diagram which shows one specific example of the electric current value signal generation part concerning this invention. The flowchart explaining operation | movement of embodiment of this invention. 3 is a timing chart for explaining the operation of the embodiment of the present invention. 1 is a configuration diagram illustrating a schematic configuration of an inkjet printer. The perspective view which shows the structure of a carriage periphery. The schematic diagram which shows the structure of a linear encoder. Waveform diagram of encoder output pulse. FIG. 2 is a schematic perspective view of a printer for explaining a position of a paper detection sensor. FIG. 6 is a block diagram illustrating a configuration of a conventional print control apparatus. 6 is a timing chart illustrating speed control of a conventional print control apparatus. The figure explaining a paper feeding mechanism. The figure explaining the conventional problem. The perspective view which shows an example of the computer system using the recording medium which recorded the control program of the motor by this invention. The block diagram which shows an example of the computer system using the recording medium which recorded the control program of the motor by this invention.

Explanation of symbols

1 Paper feed motor (PF motor)
2 Paper feed motor driver 3 Carriage 4 Carriage motor (CR motor)
5 Carriage motor driver (CR motor driver)
6 DC unit 6a Position counter 6b Subtractor 6c Target speed calculator 6d Speed calculator 6e Subtractor 6f Proportional element 6g Integral element 6h Differentiating element 6j D / A converter 6k Timer 6m Acceleration controller 6p Pulse counter 6q Current value signal generator 7 Pump Motor 8 Pump Motor Driver 9 Recording Head 10 Head Driver 11 Linear Encoder 12 Code Plate 13 Encoder (Rotary Encoder)
15 Paper detection sensor 16 CPU
17 Timer IC
18 Host computer 19 Interface unit 20 ASIC
21 PROM
22 RAM
23 EEPROM
25 Platen 30 Pulley 31 Timing belt 32 Carriage motor guide member 34 Ink cartridge 35 Capping device 36 Pump unit 37 Cap 50 Recording paper 65 Paper feed roller 66 Drive roller 68 Paper discharge roller 69 Drive roller 71 Current value determination means 72 Detection means 80 Spring

Claims (7)

A position detector that detects the position of the paper driven by the paper feed motor based on an output pulse of an encoder that rotates according to the rotation of the paper feed motor; a target value of the paper feed amount; and an output of the position detector; A printing control apparatus comprising a drive control unit for controlling the driving of the paper feed motor by adding a current value to the paper feed motor based on
Based on an output pulse of the encoder after the paper feed amount reaches the target value, a current value signal for stopping the paper movement or moving the paper in a direction opposite to the normal paper feed direction is generated. A print control apparatus configured to drive and control the paper feed motor by the drive control unit based on the current value signal. When the output pulse of the encoder is counted when the paper moves in the direction opposite to the normal paper feed direction after the paper feed amount reaches the target value, and the count value reaches a predetermined value A pulse counter that outputs a command signal to
A current value signal generating unit that generates the current value signal when the command signal is received or when the paper is moving in a direction opposite to a normal paper feeding direction;
The print control apparatus according to claim 1, further comprising: The current value signal generator is
Detecting means for detecting whether the paper is stopped or moving in a direction opposite to a normal paper feeding direction based on an output of the encoder;
Current value determination means for determining and outputting the current value signal based on the command signal or the detection result of the detection means;
The printing control apparatus according to claim 2, further comprising:   The current value determining means outputs the same current value signal as the previous current value signal when the paper is stopped, and the previous time when the paper is moving in the direction opposite to the normal paper feeding direction. The print control apparatus according to claim 3, wherein current value signals having an absolute value smaller than an absolute value but the same sign are generated. After the paper feed amount reaches the target value, the paper movement stops based on the output pulse of the encoder that rotates according to the rotation of the paper feed motor, or the paper moves in the direction opposite to the normal paper feed direction. Generating a moving current value signal;
Driving and controlling the paper feed motor based on the current value signal;
A printing control method comprising: Generating the current signal comprises:
Counting the output pulses of the encoder when the paper is moving in the direction opposite to the normal paper feed direction;
Generating the current value signal when the count value of the output pulse reaches a predetermined value;
The printing control method according to claim 5, further comprising: After the paper feed amount reaches the target value, the paper movement stops based on the output pulse of the encoder that rotates according to the rotation of the paper feed motor, or the paper moves in the direction opposite to the normal paper feed direction. A procedure for generating a moving current value signal;
A procedure for driving and controlling the paper feed motor based on the current value signal;
A recording medium on which a printing control program for controlling printing by a computer is recorded.

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