JP2001180054A - Print control device and print control method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable printing at a position as accurate as possible. SOLUTION: A position detecting unit 6a for detecting a position of a paper driven by a paper feed motor based on an output pulse of an encoder 13 which rotates according to the rotation of the paper feed motor 1.
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 target value of the paper feed amount and the output of the position detection unit. When the feed motor is stopped, the absolute value of the deviation between the target value of the paper feed amount and the output of the position detection unit is a first predetermined value and a second predetermined value smaller than the first predetermined value. A current value signal generator 6p that determines whether the current value is within a range between the current value and the current value, and generates a current value signal having a deviation of zero when the current value is within the range. The paper feed motor is controlled based on the value signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print control device and a print control method, and more particularly to a control of paper feed.

[0002]

2. Description of the Related Art A conventional print control apparatus will be described with reference to FIGS. This printing control device is used in an ink jet printer, and a schematic configuration of the ink jet printer is shown in FIG.

This ink jet printer includes a paper feed motor (hereinafter also referred to as a PF motor) 1 for feeding paper,
A paper feed motor driver 2 for driving this paper feed motor 1
, A carriage 3, a carriage motor (hereinafter also referred to as a CR motor) 4 for driving the carriage 3, and a CR motor driver 5 for driving the carriage motor 4
A DC unit 6, a pump motor 7 for controlling suction of ink for preventing clogging, a pump motor driver 8 for driving the pump motor 7, and ink ejected to the printing paper 50 fixed to the carriage 3. Head 9
And a head driver 10 for driving and controlling the head 9
And a linear encoder 11 fixed to the carriage 3
And a code plate 12 having slits formed at predetermined intervals,
A rotary encoder 13 for the PF motor 1 and a paper detection sensor 15 for detecting the end position of the paper being printed
A CPU 16 for controlling the entire printer;
Timer IC1 that periodically generates an interrupt signal for
7, an interface unit (hereinafter, also referred to as IF) 19 for transmitting and receiving data to and from the host computer 18,
An ASIC 20 for controlling the printing resolution and the driving waveform of the head 9 based on the printing information sent from the host computer 18 via the IF 19;
PROM 21, RAM 22, and EEPROM 23 used as a work area and a program storage area of PU 16
A platen 25 supporting the paper 50 being printed, a transport roller 27 driven by the PF motor 1 to transport the print paper 50, a pulley 30 attached to the rotation shaft of the CR motor 4, and the pulley 30. And a driven timing belt 31.

The DC unit 6 drives and controls the paper feed motor driver 2 and the CR motor driver 5 based on control commands sent from the CPU 16 and outputs of the encoders 11 and 13. Further, the paper feed motors 1 and C
Each of the R motors 4 is constituted by a DC motor.

FIG. 4 shows a configuration around the carriage 3 of the ink jet printer.

The carriage 3 is connected to the carriage motor 4 via a pulley 30 by a timing belt 31, and is driven by a guide member 32 to move in parallel with the platen 25. On the surface of the carriage 3 facing the printing paper, a recording head 9 composed of a nozzle row for discharging black ink and a nozzle row for discharging color ink is provided. Each nozzle row is supplied with ink from an ink cartridge 34. Prints characters and images by ejecting ink droplets on printing paper.

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

When clogging occurs in the nozzle opening row of the head 9 or when the cartridge 34 is replaced or the like,
When the ink is forcibly ejected from the pump unit, the pump unit is operated while the head 9 is sealed, and the ink is sucked out from the nozzle opening row by the negative pressure from the pump unit. As a result, dust and paper dust adhering in the vicinity of the nozzle opening row are washed, and the air bubbles in the head 9 are discharged to the cap 37 together with the 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 and a collimator lens 11
b 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 ,
It has a 11f _B, and.

When a 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 made parallel by the collimator lens 11b and passes through the code plate 12. Code plate 12
At a predetermined interval (for example, 1/180 inch (= 1/18)
0 × 2.54 cm)).

The parallel light that has passed through the code plate 12 passes through a fixed slit (not shown) to each photodiode 11d.
And is converted into an electric signal. The electric signals output from the four photodiodes 11d are applied to the signal processing circuit 11
The signal is processed in e. The signals outputted from the signal processing circuit 11e is a comparator 11f _A, are compared in 11f _B, the compared results are outputted as pulses. Pulse E output from comparators 11f _A and 11f _B
NC-A and ENC-B are outputs of the encoder 11.

The phases of the pulses ENC-A and ENC-B differ 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 pulse ENC-A is changed to the pulse ENC as shown in FIG.
When the CR motor 4 is rotating in the reverse direction by 90 degrees from that of the pulse ENC-B as shown in FIG.
The encoder 4 is configured such that the phase of A is delayed by 90 degrees from the pulse ENC-B. One cycle T of the pulse is equal to the slit interval of the code plate 12 (for example, 1 /
This corresponds to 180 inches (= 1/180 × 2.54 cm), which is equal to the time during which the carriage 3 moves through the slit interval.

On the other hand, the rotary encoder 13 for the PF motor 1 has the same configuration as the linear encoder 11 except that the code plate is a rotating disk that rotates in accordance with the rotation of the PF motor 1. Output pulses ENC-A,
Outputs ENC-B. In the ink jet printer, the slit interval of a plurality of slits provided on the code plate of the encoder 13 for the PF motor 1 is 1 /.
180 inches (= 1/180 × 2.54 cm)
When the PF motor 1 rotates by one slit interval, 1
The paper is fed by / 1440 inches (= 1/1440 × 2.54 cm).

Next, the paper detection sensor 15 shown in FIG.
Will be described with reference to FIG. In FIG. 7, the paper 50 inserted in the paper feed slot 61 of the printer 60 is shown.
Is a paper feed roller 64 driven by a paper feed motor 63
Is sent into the printer 60. Printer 60
The leading end of the paper 50 fed into the inside is detected by, for example, an optical paper detection sensor 15. This paper detection sensor 15
The paper 50 whose leading end is detected is fed by a paper feed roller 65 driven by the PF motor 1 and a driven roller 66.

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 printed paper 50 is detected by the paper detection sensor 15. 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 driven to rotate, and the paper 50 on which printing has been completed is discharged to the paper discharge port. It is discharged from 62 to the outside.

A code plate of the encoder 13 is attached to a rotation shaft of the paper feed roller 65.

Next, control of the PF motor 1 of the conventional ink jet printer will be described with reference to FIGS. This PF motor 1 is controlled by the DC unit 6
As shown in FIG. 8, the DC unit 6 includes a position counter 6a, a subtractor 6b, a target speed calculator 6c, a speed calculator 6d, a subtractor 6e, a proportional element 6
f, integral element 6g, differential element 6h, and adder 6i
, A D / A converter 6j, a timer 6k, an acceleration control unit 6m, and a feed amount correction calculation unit 90.

The position counter 6a detects the rising edge and the 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 count value, determines the PF. The amount of paper fed by the motor 1 is calculated. When the PF motor 1 is rotating forward, "+1" is added when one edge is detected, and when the PF motor 1 is rotating reversely, "-1" is added when one edge is detected. Is added. Pulse ENC-
Each period of A and ENC-B is equal to the slit interval of the code plate, and pulse ENC-A and pulse ENC-B
Are 90 degrees out of phase. Therefore, the count value “1” of the above-described count corresponds to １ ／ of the slit interval of the code plate of the encoder 13. When the PF motor 1 rotates by one slit interval, 1/1440 inch (= 1
/1440×2.54 cm).

The feed amount correction calculating section 90 operates based on a start command of the PF motor 1 sent from the CPU 16, and outputs a target start position "0" and a count value of the position counter 6a immediately after receiving the start command. Based on the (pulse number), that is, the previous stop position, the corrected paper feed amount is calculated. Then, the corrected feed amount is sent to the position counter 6a, and the count value of the position counter 6a is set to be the corrected feed amount. At this time, the count value of the position counter 6a is set so that the count value decreases as the position approaches the target position.

The subtractor 6b calculates a positional deviation between the target position "o" 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 output from 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. The value of the gain Kp may be stored in a table (not shown).

The speed calculator 6d 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 determined as follows. First, the output pulses ENC-A, EN of the encoder 13
The rising edge and the falling edge of each of CB are detected, and the time interval between the edges is counted by, for example, a timer counter. Assuming that the count value is T, the speed is proportional to 1 / T.

The subtractor 6e has a target speed and a speed calculator 6
A speed deviation from the actual speed of the PF motor 1 calculated by d is calculated.

The proportional element 6f multiplies the speed deviation by a constant Gp and outputs the multiplication result. The integral element 6g integrates the value obtained by multiplying the speed deviation by a constant Gi. The differential element 6h multiplies the difference between the current speed deviation and the immediately preceding speed deviation by a constant Gd, and outputs the multiplication result. The calculation of the proportional element 6f, the integral element 6g, and the differential element 6h is performed by the encoder 13
Is performed in synchronization with, for example, the rising edge of the output pulse ENC-A.

The outputs of the proportional element 6f, the integral element 6g, and the differential element 6h are added in an adder 6i. Then, the addition result, that is, the drive current of the PF motor 1 is D / A
The signal is sent to the converter 6j and converted into an analog current.
PF is determined by the driver 10 based on the analog current.
The motor 1 is driven.

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 differential element 6h is used for constant speed and deceleration control during acceleration.

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

The acceleration control unit 6m integrates a predetermined current value (for example, 20 mA) to the target current value every time the timer interrupt signal is received, and the result of the integration, that is, the target current value of the PF motor 1 during acceleration is D / D. It is sent to the A converter 6j.
As in the case of the PID control, the target current value is converted to an analog current by the D / A converter 6j, and based on the analog current, the PF motor 1
Is driven.

The driver 10 has, for example, four transistors, and turns on or off each of the above-mentioned transistors based on the output of the D / A converter 6j. (A) Operation for rotating the PF motor 1 forward or backward Mode (b) Regenerative brake operation mode (short brake operation mode, that is, a mode in which the PF motor 1 is kept stopped) (c) A configuration in which a mode in which the PF motor 1 is stopped can be performed. .

Next, the operation of the DC unit 6 will be described with reference to FIGS. When the PF motor 1 is stopped, the CPU 16 sends the PF motor 1 to the DC unit 6.
Is transmitted, the feed amount corrected by the feed amount correction calculating unit 90 is calculated, and the calculated feed amount is set as the count value of the position counter 6a. At this time started from the acceleration controller 6m initial current value _{I 0} is fed to the D / A converter 6j. It should be noted that the initial starting current value I ₀ is set together with the starting command signal by C
It is sent from the PU 16 to the acceleration controller 6m. The current value _{I 0} is Ana by the D / A converter 6j
The log current is converted and sent to the driver 10, and the driver 10 starts the PF motor 1 (FIG. 9).
(See (a) and (b)).

After receiving the start command signal, the timer 6k generates a timer interrupt signal at predetermined time intervals. 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 10.
Then, the driver 5 drives the PF motor 1 so that the value of the current supplied to the PF motor 1 becomes the integrated current value, and the speed of the PF motor 1 increases (FIG. 9).
(B)). Therefore, the current value supplied to the PF motor 1 has a step shape as shown in FIG.

At this time, the PID control system is also operating.
However, the D / A converter 6j outputs the output of the acceleration control unit 6m.
Select and import. At this time, the carriage 3
Since the position is approaching the position “0”, the position counter 6a
The und value has also become smaller. Current of acceleration control unit 6m
In the value integration process, the integrated current value is a constant current value I_SWhen
It is done until it becomes. Time t₁The current value integrated at
Predetermined value I_S, The acceleration control unit 6m stops the integration process
Then, a constant current value I is supplied to the D / A converter 6j. _SSupply
I do. As a result, the value of the current supplied to the PF motor 1 becomes
Current value I_SDriven by the driver 10 so that
(See FIG. 9A).

When the speed of the PF motor 1 reaches a predetermined speed V ₁ (time t ₂ ), the current supplied to the PF motor 1 is reduced in order to prevent the speed of the PF motor 1 from overshooting. Acceleration control unit 6 to reduce
m controls. In this case although the speed is further increased PF motor 1, (see time t3 in FIG. 9 (b)) and the speed of the PF motor 1 reaches a predetermined speed _{v c,} D / A converter 6j is, the PID control system The output, that is, the output of the adder 6i is selected, and PID control is performed.

That is, the target position "0" and the counter 6
The target speed is calculated on the basis of the position deviation from the count value of a, and the proportional element 6 is calculated based on the speed deviation between the target speed and the actual speed obtained from the output of the encoder 13.
f, the integral element 6g, and the differential element 6h operate to perform proportional, integral, and differential calculations, respectively, and control the PF motor 1 based on the sum of the calculation results. Note that the above-described proportional, integral, and differential calculations are performed, for example, in synchronization with the rising edge of the output pulse ENC-A of the encoder 13. Thereby, the speed of the PF motor 1 is controlled to be 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.}

The PF motor 1 from the time _{t 4} the desired speed v
_e . Thereafter, PF when the motor 1 approaches the target position (see time t ₅ in FIG. 9 (b)), the target speed is also reduced from the modified position deviation small Kunar, deceleration of the PF motor 1 is performed, the time P F motor 1 is stopped to t _6.

As described above, in the conventional print control apparatus, the feed amount correction calculation is performed based on the current target feed amount and the count value of the position counter 6a immediately after receiving the start command, that is, the previous stop position. The feed amount at the time of this start-up is corrected by the unit 90, and the corrected feed amount is set as the count value of the position counter 6a, and based on the position deviation between the target value “0” and the output of the position counter 6a. Since the paper feed control is performed, the paper can be stopped at the target position, so that the paper can be fed with high accuracy.

Since the maximum count value of the position counter 6a is the corrected feed amount, the capacity of the position counter 6a can be reduced.

[0038]

In the conventional printing control apparatus having the above-described structure, it is possible to feed a paper with high accuracy. However, if the origin position "0" of the printing of the paper 50 is displaced after the stop without receiving the paper feed command (that is, the start command), the origin position "0" is displaced by, for example, a person pulling the paper. In such a case, the next printing starts from the displaced position, and there is a problem that printing cannot be performed at an accurate position.

The present invention has been made in consideration of the above circumstances, and has as its object to provide a print control apparatus and a control method capable of performing printing at a position as accurate as possible.

[0040]

According to the present invention, there is provided a print control apparatus comprising: a position detecting unit for detecting a position of a paper driven by a paper feed motor based on an output pulse of an encoder which rotates according to the rotation of the paper feed motor; A print control device that adds a current value to the paper feed motor based on the target value of the paper feed amount and the output of the position detection unit, and controls the drive of the paper feed motor. In the above, when the paper feed motor is stopped, the absolute value of the deviation between the target value of the paper feed amount and the output of the position detection unit is determined by a first predetermined value and the first predetermined value. A current value signal generating unit that determines whether the current value is within a range between the second predetermined value and the second predetermined value, and generates a current value signal in which the deviation becomes zero when the difference is within the range. And the drive control unit outputs the current value signal. Zui with and controlling said paper feed motor.

It is to be noted that the apparatus further comprises a paper discharge processing section for discharging the paper, wherein the current value signal generating section is configured to output the current value signal when the absolute value of the deviation exceeds the first predetermined value. May be configured to send a paper ejection command to perform a paper ejection process.

The drive control section may be provided with a PID control section.

Further, according to the printing control method of the present invention, when the paper feed motor is stopped, the target value of the paper feed amount at the time of the previous start and the output pulse of the encoder rotating according to the rotation of the paper feed motor are provided. Calculating a deviation from the actual paper feed amount calculated based on the following formula: between an absolute value of the deviation and a second predetermined value smaller than the first predetermined value. Determining whether or not the difference is within a range, generating an electric current value signal in which the deviation becomes zero when the absolute value of the deviation is within the range, and based on the electric current value signal, Controlling the paper feed motor.

It is to be noted that the method may further comprise the step of performing the paper discharging process when the absolute value of the deviation exceeds the first predetermined value.

[0045]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a print control apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a block diagram illustrating the configuration of a print control apparatus according to the present embodiment, and FIG. 2 is a flowchart illustrating the operation of the present embodiment.

The print control device 6 of this embodiment is similar to that of FIG.
In the conventional print control device (DC unit) 6, a current value signal generator 6p and a paper discharge processor 6q are newly added. The components other than the current value signal generator 6p and the paper discharge processor 6q have already been described in the related art.
Description is omitted.

The current value signal generating part 6p, when the PF motor 1 is stopped, a subtractor absolute value a predetermined value _{N 1} of the positional deviation output from 6b and the predetermined value _N 2 _{(<N 1)} It is determined whether or not the current value is within the range, and if it is within the above range, a current value signal is generated such that the deviation becomes “0”, and the D / A
Transmitted to converter 6j. Further, if the absolute value of the positional deviation exceeds a predetermined value N ₁ to perform the discharge process. The absolute value of the positional deviation is in the case of less than the predetermined value N _2, the control is ended.

When receiving the paper discharge command from the current value signal generator 6p, the paper discharge processing unit 6q outputs a current value signal required for paper discharge to D
The sheet is sent to the / A converter 6j, and the PF motor 1 is operated to perform a sheet discharging process.

[0049] The predetermined value _{N 2,} for example 1/1440
The value is set to inches (= 1/1440 × 2.54 cm), that is, a value corresponding to one cycle of the output pulse ENC-A of the encoder 13. This is because it is difficult to stop at a position where the position deviation becomes zero in the control of the DC motor, and the position deviation is ± 1/5760 inches (= 11/5760 × 2.
It is common to stop within 54cm),
In the present embodiment, N ₂ is 1/1440 as an allowable range.
This is because it is set to inches (= 1/1440 × 2.54 cm).

[0050] The predetermined value _{N 1} is, for example 22/1440
It is set to a value of inches (= 22/1440 × 2.54 cm). This is because, when the paper is fed in the direction opposite to the paper discharge direction, the lock lever of the carriage connected to the paper feed motor rises, and the carriage may hit the lock lever during flushing or capping. The paper that has come off the paper device is sent in the reverse direction, so there is a possibility that there will be no place to go and a paper jam will occur,
This is because there is a limit in performing paper feeding in the reverse direction.

Note that the predetermined values N ₁ and N ₂ may be changed according to the type of paper (eg, thickness, surface friction coefficient, etc.) and the number of times of use.

Next, the current value signal generator 6p of this embodiment
Will be described with reference to FIG.

Now, consider a state in which the PF motor starts and then stops.

[0054] First, the absolute value of the predetermined value N ₁ below whether the current value signal generating part 6p position deviation which is the output of the subtracter 6b
(See step F1 in FIG. 2). If the absolute value exceeds the predetermined value N ₁ is discharge command from the current value signal generating part 6p to discharge process unit 6q it is sent. Then, a current value signal required for paper discharge from the paper discharge processing unit 6q is D /
The current is sent to the A converter 6j, and the PF motor 1 is started based on the current value signal to perform a sheet discharging process (see step F2 in FIG. 2).

[0055] The absolute value of the positional deviation is in the case of less than the predetermined value N _1, and further determines the absolute value is a predetermined value N ₂ or less whether or not the current value signal generator 6p (see step F3 in FIG. 2) , in the case of less than the predetermined value N ₂ terminates the control.
If the absolute value of the positional deviation exceeds a predetermined value N _2, the current value signal the positional deviation becomes zero is sent from the current value signal generating part 6p to the D / A converter 6j (step of FIG. 2 F4 reference). Then, the PF motor 1 is started based on the current value signal, and is controlled so that the position deviation becomes zero (see step F5 in FIG. 2).

As a result, the origin position of printing can return to the position before the displacement, and printing can be performed at an accurate position.

Although the current value signal generator 6p operates based on the output of the subtractor 6b in the above embodiment, it may be configured to operate based on the output of the position counter 6a.

[0058] In the above embodiment, when the absolute value of the positional deviation exceeds a predetermined value N ₁ is performed discharge process, without performing the discharge process, the origin point displaced Alternatively, the printing may be performed.

In the above embodiment, first, the position deviation
Is the predetermined value N₁And then a predetermined value N₂When
Were compared, first the predetermined value N₂And then
Value N ₁You may make it compare with. Flow in this case
The chart is shown in FIG. The flow chart shown in FIG.
In the flowchart shown in FIG.
1 and the order of step F2 are interchanged.
You.

In the above embodiment, the PF motor 1
Although the case where the motor is a C motor has been described as an example, the present invention is not limited to this. Needless to say, the same effect can be obtained when the PF motor is an AC motor.

[0061]

As described above, according to the present invention, P
Even if the origin position of printing is displaced after the stop of the F motor, it can be returned to the original position, and printing can be performed at a position as accurate as possible.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a print control apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of the embodiment of the present invention.

FIG. 3 is a configuration diagram illustrating a schematic configuration of an inkjet printer.

FIG. 4 is a perspective view showing a configuration around a carriage.

FIG. 5 is a schematic diagram showing a configuration of a linear encoder.

FIG. 6 is a waveform diagram of an output pulse of an encoder.

FIG. 7 is a schematic perspective view of the printer for explaining the position of a paper detection sensor.

FIG. 8 is a block diagram illustrating a configuration of a conventional print control apparatus.

FIG. 9 is a timing chart illustrating speed control of a conventional print control device.

FIG. 10 is a flowchart illustrating an operation of a modification of the embodiment of the present 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 Differential element 6j D / A converter 6k Timer 6m Acceleration controller 6p Current value signal generator 6q Discharge processor 7 Pump motor 8 Pump motor driver 9 Recording head 10 Head driver 11 Linear encoder DESCRIPTION OF SYMBOLS 12 Code board 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 Plate 30 a pulley 31 a timing belt 32 a carriage motor of the guide member 34 ink cartridge 35 capping device 36 the pump unit 37 cap 50 paper 90 feeding amount corrected calculation unit

Claims (5)

[Claims] A position detecting section for detecting a position of a paper driven by the paper feed motor based on an output pulse of an encoder which rotates according to a rotation of the paper feed motor; a target value of the paper feed amount and the position; A drive control unit that adds a current value to the paper feed motor based on the output of the detection unit and controls the drive of the paper feed motor, wherein the paper feed motor is stopped. A range in which the absolute value of the deviation between the target value of the paper feed amount and the output of the position detection unit is between a first predetermined value and a second predetermined value smaller than the first predetermined value. And a current value signal generation unit that generates a current value signal in which the deviation becomes zero when the current value signal is within the range. Controlling the paper feed motor based on the Print control apparatus according to. 2. The apparatus according to claim 1, further comprising: a discharge processing unit configured to discharge the paper, wherein the current value signal generation unit is configured to control the discharge processing unit when an absolute value of the deviation exceeds the first predetermined value. 2. The print control apparatus according to claim 1, wherein a paper discharge command is sent to the printer to perform a paper discharge process. 3. The printing control device according to claim 1, wherein the drive control unit includes a PID control unit. 4. The method according to claim 1, wherein when the paper feed motor is stopped, the target value of the paper feed amount at the time of the previous start and the output pulse of the encoder rotating according to the rotation of the paper feed motor are calculated. Determining a deviation from the actual paper feed amount; and determining whether an absolute value of the deviation is within a range between a first predetermined value and a second predetermined value smaller than the first predetermined value. Determining, whether the absolute value of the deviation is within the range, generating a current value signal in which the deviation becomes zero, and controlling the paper feed motor based on the current value signal And a printing control method comprising: 5. The control method according to claim 4, further comprising the step of: performing a sheet discharging process when the absolute value of the deviation exceeds the first predetermined value.