JPH05338308A - Control method for carriage motor of printer - Google Patents

Abstract

PURPOSE:To improve printing quality by a method wherein a position of a carriage is detected with a linear encoder, and a carriage driving motor is controlled with a CPU to control a transfer speed. CONSTITUTION:When a motor driving signal is inputted to a motor control circuit 8 and a CPU 9 from a host computer 6 of a printer control unit 5, a motor 2 is driven and a shuttle head is linearly operated. Then, a liner encoder 4 inputs a timing signal to the CPU 9. The CPU 9 controls the motor driving circuit 8 based on this signal. When the linear encoder 4 comes at a position for start of printing, a reset signal is inputted to the CPU 9. Then, the CPU 9 measures a timing signal, compares setting motor control with a timing signal width according to a position of the shuttle head 1, understands a motor load, and keeps a speed constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to motor control of a printer device.

[0002]

2. Description of the Related Art Conventionally, in this type of technique, a print ejection position is determined by ejection position detectors provided at both ends or one side of the moving range of the head, and a rotary encoder of a printer or a tacho generator of a motor provided in a rotary portion of the printer. The signal was used as a timing signal for printing.

Further, in controlling a drive motor of a carriage equipped with a head, electric control is performed by a signal of a rotary encoder or output of a motor tachogenerator, or control is performed by a stepping motor.

[0004]

However, in the prior art, in the reciprocating movement of the carriage, due to an error that occurs between the signal of the rotating portion of the printer and the position of the reciprocating movement of the carriage, the ejection is performed line by line or dot by dot. The position is misaligned and high print quality cannot be obtained.

Further, in the speed control, since a deviation occurs between the signal of the printer rotating unit and the signal corresponding to the linear operation of the carriage, it is difficult to control the linear operation speed of the carriage corresponding to the print position on the signal. The present invention has been made to solve such a drawback, and an object thereof is to provide a printer having high printing quality.

[0006]

According to the motor control method of the present invention, in a printer apparatus which prints by a movement signal to a carriage equipped with a head, the position of the carriage is detected by a linear encoder which directly operates a position signal mechanism. It is characterized in that the moving speed is controlled by the CPU by the motor that is the drive source of the carriage.

[0007]

According to the above construction of the present invention, the carriage equipped with the head is provided with the position signal detection, and the speed is controlled by the position signal detection signal and the CPU, whereby the high precision printing start position is achieved. High quality and stable printing can be obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below by taking a shuttle type dot printer using a DC power motor as a drive source as an example. FIG. 1 shows a printing mechanism section of a shuttle type dot printer according to an embodiment of the present invention. Shuttle head 1
When the motor 2 rotates, the cam groove 3 rotates and the shuttle head moves linearly along the cam groove.

In the prior art, a position detector is provided at both ends or one side of the linear operation of the shuttle head, and the shuttle head is energized by detecting the operation reference of the shuttle head and detecting the rotation of the tacho generator of the motor. I had decided the timing. Therefore, the mechanical operation such as gear backlash occurs in the linear operation of the shuttle head and the timing of the tacho generator on the rotation of the motor.
High-precision shuttle head energization position could not be detected. According to the present invention, by providing the shuttle head 1 with the linear encoder 4 so as to obtain the linear operation position and the timing signal of the shuttle head 1 at the same time, the linear operation of the shuttle head 1 can be accurately captured.

FIG. 2 is a block diagram showing an example of a shuttle type dot printer and an external control circuit according to the present invention.
The motor 2 receives the motor drive signal from the host computer 6 of the printer control unit 5 and the motor control circuit 8 and CPU 9 of the shuttle head printer device 7.
Is input to the motor 2, the shuttle head 1 performs a linear operation, the linear encoder 4 provided in the shuttle head 1 outputs a timing signal, and the CPU 9 outputs the timing signal.
Entered in. The CPU 9 starts controlling the motor drive circuit 8 when the predetermined speed is reached. Next, the linear encoder 4 detects the reset signal which is the print ejection position and inputs it to the CPU 9.

When a reset signal is input to the CPU 9, C
PU9 measures the timing signal and shuttle head 1
Depending on the position, the preset motor control is compared with the timing signal width, and a constant speed is controlled while catching the motor load fluctuation during shuttle head linear operation. The motor 2 is stopped by a motor drive signal being input to the motor control circuit 8 from the host computer 6 of the printer control unit 5.

For printing, a reset signal, which is a print ejection position of the linker encoder 4, is input to the host computer 6, and the host computer 6 causes the print control circuit 10 to perform printing.
A character pattern is output to the print control circuit 10, and the print control circuit 10 energizes the shuttle head 1 of the shuttle printer device 7 so that one dot line is printed and a reset signal is sent to the host computer 6 of the printer control unit 5.
The paper feed motor control circuit 11 feeds paper by the paper feed motor 12 provided in the shuttle printer.

FIG. 3 shows an example of a conventional shuttle type dot printer and an external control circuit. When the motor 2 is input from the host computer 6 of the printer control unit 5 to the motor control circuit 8 of the shuttle head printer device 7 by a motor drive signal, the motor 2 starts to drive and the shuttle head 1 makes a linear operation. Tacho generator 13 provided in the motor 2
Outputs a timing signal and is input to the waveform shaping circuit 14, and when the voltage of the timing signal reaches a constant voltage, control of the motor drive circuit 8 is started. Next, detectors for detecting the reset signal are arranged at the left and right ejection positions at the print ejection position of the printer, the reset signal is detected by the linear operation of the shuttle head 1, and the reset signal is input to the host computer 6 of the printer control unit 5.

When the motor 2 is stopped, a motor drive signal is input from the host computer 6 of the printer control unit 5 to the motor control circuit 8 and stopped. The printing is
A reset signal indicating the print ejection position is input to the host computer 6, and the host computer 6 outputs a character pattern to the print control circuit 10 and the print control circuit 10
However, by energizing the shuttle head 1 of the shuttle printer device 7, one dot line is printed, and a reset signal is sent from the host computer 6 of the printer control unit 5 to the paper feed motor control circuit 11 which feeds the paper to the paper feed provided in the shuttle printer. The paper is fed by the motor 12.

[0015]

As described above, according to the present invention, in the motor control system of the printer apparatus having the position signal of the carriage having the head for printing on the printing paper, the linear encoder for detecting the position of the carriage is used. The load fluctuation that occurs when the carriage moves on the motor shaft that is the drive source of the carriage is detected by the CPU by the timing signal of the linear encoder, and the motor is controlled to control the movement speed of the head equipped on the carriage. Since it is easy to perform, high-speed, high-quality, stable printing can be obtained with a highly accurate printing start position.

[Brief description of drawings]

FIG. 1 is a view of a printing mechanism section showing an embodiment of the present invention.

FIG. 2 is a circuit configuration diagram showing an embodiment of the present invention.

FIG. 3 is a circuit configuration diagram showing an example of a conventional technique.

[Explanation of symbols]

 1 shuttle head 2 motor 3 cam groove 4 linear encoder 5 printer control unit 6 host computer 7 shuttle head printer device 8 motor control circuit 9 CPU 10 print control circuit 11 paper feed motor control circuit 12 paper feed motor 13 tacho generator 14 waveform shaping circuit

Claims (1)

[Claims] 1. In a printer device for performing printing by a movement signal to a carriage equipped with a head, the position of the carriage is detected by a linear encoder which directly operates a position signal mechanism, and a movement speed is controlled by a motor which is a drive source of the carriage. A carriage motor control method for a printer, wherein the carriage motor is controlled by a CPU.