JP2738802B2 - Carrier jam detection control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier jam detection control method for detecting a carrier jam in which movement of a carrier to which a head is mounted is stopped and controlling driving of the carrier in a printer device.

[0002]

2. Description of the Related Art A printer device that servo-controls a carrier on which a print head is mounted by using a DC motor is used. In the above printer device, the speed of the carrier for moving the print head or the angular speed of the motor for driving the carrier is detected, and a voltage value or a current value to be applied to the DC motor is determined based on a deviation between the detected speed and a target speed. ing.

As a method of detecting carrier jam in the above-described printer, conventionally, an applied voltage or an applied current when the carrier is moving at a constant speed is detected, and when the value exceeds a certain range, the carrier jam is detected. Carrier jam stop processing such as stopping the motor is performed assuming that the load on the motor driving the motor has increased. FIG. 5 is a diagram showing a configuration of a conventional carrier drive control circuit provided with the above-described carrier jam detection control means. In FIG. 5, reference numeral 21 denotes a microprocessor, and 21a denotes speed command means for outputting a carrier speed command pattern. , 21b are control means for controlling the carrier motor, 21c is comparison means for comparing the output to the carrier motor with a predetermined limit value,
Reference numeral 21d denotes a carrier jam processing means for performing a carrier jam stop process such as abnormally stopping the carrier motor when an output is generated by the comparison means 21c. Reference numeral 22 denotes a drive circuit for driving the carrier motor.

Reference numeral 23 denotes a printer, and 23a
Is a carrier motor, 23b is an encoder for detecting the rotation of the motor 23a, 23c is a carrier, and 23d is a platen. In FIG. 5, the rotation of the carrier motor 23a is detected by the encoder 23b. The microprocessor 21 is provided with an encoder 23 at a predetermined sampling cycle.
The output of b is read, and the speed of the carrier motor 23a is calculated. Next, the calculated speed and the speed command means 21
The speed deviation is obtained by comparing the outputs of a.

[0005] The control means 21b calculates the voltage or current applied to the carrier motor 23a by performing a proportional / integral operation or the like on the speed deviation obtained as described above, and outputs the voltage or current to the drive circuit 22. The drive circuit 22 drives the carrier motor 23a of the printer device 23 based on the output of the microprocessor 21. On the other hand, the voltage applied to the carrier motor 23a output from the control means 21b, or
The current is supplied to the comparing means 21c. The comparing means 21c compares the voltage or current value applied to the carrier motor 23a with a predetermined limit value when the carrier is driven at a constant speed, and the voltage or current value is determined to be a predetermined value. An output is generated if the limit is exceeded. When the comparator 21c generates an output, the abnormality detector 21d performs a carrier jam stop process such as stopping the carrier motor, assuming that a carrier jam has occurred.

FIG. 6 is a diagram showing a carrier speed command pattern and a voltage or current applied to a carrier motor in the conventional carrier drive control circuit shown in FIG. 5, and FIG. Indicates the pattern,
(B) shows the voltage or current applied to the carrier motor. As shown in the figure, the voltage or current applied to the carrier motor is substantially constant during the period T in which the carrier speed is constant, but when a carrier jam occurs, the load on the carrier motor increases. Therefore, the voltage value or the current value becomes larger than in the normal state.

Conventionally, the voltage applied to the carrier motor during the period T when the carrier is normal,
Alternatively, a limit value L is set in consideration of a constant margin M from the current value, and the voltage or current value and the limit value L are set.
Carrier jam was detected in comparison with.

[0008]

[Problems to be Solved by the Invention] By the way,
The voltage or current applied to the motor increases as the temperature of the motor increases and the performance of the motor decreases.
Further, the voltage or the current value fluctuates due to mechanical variations. For this reason, conventionally, it is necessary to determine the margin M shown in FIG. 6 in consideration of the fluctuation due to the increase in the motor temperature or the variation in the mechanism.
Carrier jam could not be accurately detected.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to provide a carrier jam detection control method capable of accurately detecting carrier jam in a printer device. Aim.

[0010]

FIG. 1 is a block diagram showing the principle of the present invention. In FIG.
Is a carrier motor for driving the carrier, 1b is detection means for detecting the speed of the carrier motor, and 2 is a carrier motor.
Control means for controlling the motor, 3 is speed command means, and SP is a speed command value.

In order to solve the above problems, the present invention, as shown in FIG. 1, employs a carrier motor 1a, a detecting means 1b for detecting the speed of the carrier motor 1a, and a speed of the detected carrier motor 1a. The carrier motor 1 is compared with a predetermined speed command value SP, and based on the deviation,
control means 2 for calculating a voltage or a current to be applied to the carrier 1a. In the carrier jam detection control method of the printer 1 for driving the carrier motor 1a at a speed corresponding to the speed command value 3a, the carrier 1c is fixed. The voltage or current value Vm, n applied to the carrier motor 1a at each time point when moving at a high speed is determined, and the voltage or current value Vm, n at each time point is the same as the previous time when the carrier was driven in the same direction. The voltage or current value Vm-1, n at the time corresponding to each of the above times is compared, and when the difference exceeds a predetermined value M, it is determined that a carrier jam has occurred and a predetermined carrier jam has occurred. The stop processing is performed.

[0012]

In FIG. 1, the carrier 1c of the printer 1 is used.
Speed of the carrier motor 1a for driving the detecting means 1b
And is compared with the speed command value 3a output by the speed command means 3. The control means 2 is a carrier motor 1a
A voltage value or a current value to be applied to the carrier motor 1a is calculated based on a deviation between the speed and the speed command value 3a, and the carrier motor 1a is controlled.

When the carrier 1c is moving at a steady speed, the voltage or current value Vm, n applied to the carrier motor 1a at each point in time and the previous carrier 1c
Are driven in the same direction, the voltage or current value Vm-1, n at the time corresponding to each of the above times is compared. If the difference exceeds a predetermined value M, it is determined that a carrier jam has occurred and the carrier Perform jam stop processing.

As described above, according to the present invention, the voltage or current value Vm, n applied to the carrier motor 1a at each time when the carrier 1c is moving at a constant speed.
And the voltage or current value Vm, n at each of the above points
And the voltage or current value V at the time corresponding to each time when the carrier was driven in the same direction last time.
m-1, n are compared with each other, and when the difference exceeds a predetermined value M, it is determined that a carrier jam has occurred, and a predetermined carrier jam stop process is performed. In addition, the carrier jam can be detected and controlled without being affected by the variation due to the variation of the mechanism of the printer device, and the carrier jam can be detected and controlled with high accuracy.

[0015]

FIG. 2 is a diagram showing the system configuration of an embodiment of the present invention. The same components as those shown in FIG. 5 are denoted by the same reference numerals. The configuration of the system in this embodiment is basically the same as the system configuration shown in the conventional example of FIG. 5, and the operation for driving the carrier is the same as that of the conventional example. 21 is different from that of FIG.

FIG. 3 is a diagram showing a carrier speed command pattern in the system shown in FIG. 2 and a voltage applied to the carrier motor. FIG. 3 (a) shows the carrier speed command pattern, and FIG. 3 (b) shows the carrier speed command pattern. -Indicates the voltage applied to the motor. Although FIG. 3 shows the voltage value applied to the carrier motor 23a, the current value applied to the carrier motor 23a also
The same is true, and the following description will be made based on the voltage value.

Next, carrier jam detection in this embodiment will be described with reference to FIGS. 2, the microprocessor 21 samples the rotation of the carrier motor 23a detected by the encoder 23b at a predetermined cycle (ΔT in FIG. 3), and calculates the speed of the carrier motor 23a. Then, as described in the conventional example of FIG. 5, the microprocessor 21 obtains the voltage to be applied to the carrier motor 23a and calculates the voltage applied to the carrier motor 23a.
control a.

Further, the microprocessor 21 applies a voltage to be applied to the carrier motor 23a at each sampling point (T1 to Tn in FIG. 3) in a constant speed movement region (A region in FIG. 3) in which the carrier motor moves at a constant speed. V1 to Vn are stored. Then, microprocessor 2
Reference numeral 1 denotes a voltage V1 'to Vn' applied to the carrier motor 23a at each sampling point when the carrier motor 23a returns to the original position once and then starts moving at a constant speed again (region B in FIG. 3). Is obtained and stored, and carrier jam is detected by the following equation.

In the following equation, M1 is a margin in consideration of the applied voltage variation. That is, the voltage applied to the carrier motor 23a in each sampling cycle in the previous constant speed movement area is stored, and the stored previous applied voltage and the carrier voltage in each sampling cycle in the current constant speed movement area are stored.
The difference between the voltage applied to the motor 23a and a predetermined margin M1
When it becomes larger, it is determined that a carrier jam has occurred, and a carrier jam stop process such as stopping the carrier motor 23a is performed.

FIG. 4 is a flowchart showing a carrier jam detection process according to the embodiment of the present invention. The process of this embodiment will be described with reference to FIG. The rotation of the carrier motor 23a is detected by the encoder 23b of FIG. 2, and the rotation speed of the motor 23a is calculated by the microprocessor 21 (step S1 of FIG. 4). Next, in step S2, a speed deviation between the calculated rotation speed of the motor 23a and the speed command pattern output from the speed command means 21a is obtained, and a control value Vn applied to the motor 23a is calculated based on the obtained speed deviation. I do.

In step S3, it is determined whether or not the carrier 23c is in the constant speed moving region. If not, the process proceeds to step S7. In the case of the constant-speed movement region, in step S4, the previous applied voltage value Vn to the carrier motor 23a and the current applied voltage value Vn
In step S5, it is determined whether the difference is within the range of variation (whether or not the margin is within the margin M1).

If the result of the determination in step S5 is not within the range of the variation, the flow proceeds to step S9 to perform a carrier jam stop process such as stopping the carrier motor. If the result of the determination in step S5 is within the range of variation, the procedure goes to step S6, where Vn is stored in the memory, and the procedure goes to step S7, where the applied voltage to the carrier motor is set by the calculated applied voltage Vn. Then, in step S8, a voltage is applied to the carrier motor 23a.

[0023]

As described above, in the present invention, the carrier jam is detected based on the difference between the previous applied voltage or current value to the motor and the current applied voltage or current value in the constant speed movement region. Therefore, unlike the conventional example, it is not necessary to set a large margin in anticipation of fluctuations due to an increase in the motor temperature or a variation in the mechanism, and the carrier jam can be detected and controlled with high accuracy.

[Brief description of the drawings]

FIG. 1 is a principle block diagram of the present invention.

FIG. 2 is a diagram illustrating a system configuration according to an embodiment of the present invention.

FIG. 3 is a diagram showing a voltage value applied to a carrier motor in the embodiment.

FIG. 4 is a flowchart showing a process of the present invention.

FIG. 5 is a diagram showing a conventional example.

FIG. 6 is a diagram showing a voltage value applied to a carrier motor in a conventional example.

[Explanation of symbols]

 1 23 Printer device 1a 23a Carrier motor 1b Detecting means 2 21b Control means 3 21a Speed command means 21 Microprocessor 22 Drive circuit. 23b Encoder 23c Carrier 23d Platen

Claims (1)

(57) [Claims] A carrier motor (1a), detecting means (1b) for detecting the speed of the carrier motor (1a), a detected speed of the carrier motor (1a) and a predetermined speed command value (SP), and based on the deviation, the carrier motor
Control means for calculating the voltage or current applied to (1a)
In the carrier jam detection control method for the printer (1) that drives the carrier motor (1a) at a speed according to the speed command value (3a), the carrier (1c) moves at a constant speed. Voltage or current applied to the carrier motor (1a) at each point in time
(Vm, n), and the voltage or current value (Vm, n) at each time point and the voltage or current value (Vm-n) at the time point corresponding to each time point when the carrier was driven in the same direction last time. 1, n)
And when the difference exceeds a predetermined value (M), it is determined that a carrier jam has occurred and a predetermined carrier jam stop process is performed.