JPS62242564A - Serial printer - Google Patents

Abstract

PURPOSE:To eliminate the need for complicated control of acceleration and deceleration of a motor and for forming a control pulse train and reduce the quantity of electrode power required for acceleration or deceleration, by performing reversion of the moving direction of a printing head by collision and repulsion. CONSTITUTION:A head carriage 7 constitutes a linear motor together with a panel 8, and printing is conducted while the carriage 7 is moved rightward (leftward) relative to a printing paper 6. A potentiometer 15 is connected with the carriage 7 through a wire 10, and indicates the position of the carriage 7. Excitation of the motor is stopped when the carriage 7 comes sufficiently close to the right (left) end of a carriage guide 4. The carriage 7 collides against an elastic repelling mechanism 10, is decelerated by a spring, and a force accumulated at this time in the spring then reverses the moving direction of the carriage 7 to a leftward (rightward) direction. With the reversion of the moving direction being detected, the excitation of the motor for moving the carriage leftward (rightward) is started.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a serial printer, and more particularly to a control mechanism for a stepping motor used in a serial printer.

[Conventional technology]

A conventional printer of this type will be explained with reference to the drawings. FIG. 2 shows an example of the configuration of a conventional printer.

The step motor 1 pulls the wire 2 and the head carriage 3
is moved parallel to the left and right along the carriage guide 4.

From this point K, the print head 5 is moved horizontally on the printing paper 6 and printing is performed serially. To reverse the moving direction of the head carriage, the excitation pulse width of the motor is changed, and the motor is controlled to decelerate, stop, and accelerate in the reverse direction.

Regarding the method of controlling the step motor at this time, a case of two-phase excitation will be explained. The timing diagram of FIG. 3 shows an example of pulse timing for controlling a four-phase step motor.

The basic pulse C is the basic pulse for obtaining control pulses for each phase, the constant speed area 11 is an area where the motor is moved at a constant speed, the deceleration area 12 is an area where the motor is braked and decelerated, and the stop area 13 is an area where the motor rotation is stopped. Completely stopped region, reverse acceleration region 14 is a region in which the motor is accelerated in the reverse rotation direction, φ8. φ1゜φ1
9 and φ indicate the excitation timing of each coil.

[Problem that the invention seeks to solve]

The conventional serial printer described above accelerates the stepping motor to control the movement of the head carina.
Since it is operated at a constant speed, deceleration, stop (in the opposite direction), acceleration, and constant speed, it has the disadvantage that it requires the complicated work of determining the control pulse width train for acceleration and deceleration through experiments.

[Means for solving problems]

The serial printer of the present invention has an elastic repulsion mechanism (such as a spring) and a sensor that detects the position of the head carriage at both ends of the head carriage running path.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. The head carriage 7 constitutes a linear motor with the panel 8, and prints while moving to the right (left) on the printing paper 6. The potentiometer 15 is connected to the head carriage 7 by a wire 10, and informs the position of the head carriage 7. Head carriage 7 is on the right (left) of carriage guide 4
When you get close enough to the end, stop energizing the motor. The head carriage 7 collides with the elastic repulsion mechanism 10 and is decelerated by the spring, and the force generated at that time causes the head carriage 7 to
will eventually change its direction of movement to the left (right).

When it senses that the direction of movement has changed, it starts excitation of the motor in the left (right) direction. The method of controlling the motor at this time is 2.
This will be explained using the case of phase excitation. Figure 4 shows the pulse timing for energizing the motor. Basic pulse
is the basic timing for obtaining the control pulses for each phase, the excitation stop timing 17 is the evening timing when the excitation to the motor is stopped as the gear ridge 7 approaches the elastic repulsion mechanism 10, and the head carriage direction change point 18 is the head timing. Timing diagram in which the carriage 7 collides with the elastic repulsion mechanism 10 and changes its moving direction At excitation start timing 19, the head carriage 7 has moved away from the elastic repulsion mechanism 10, so the head carriage 7 is moved to the left (right) direction. ．． This is the timing to start excitation by shifting the phase between φ2 by 90'.

〔Effect of the invention〕

As explained above, the present invention handles the change in the moving direction of the printer head by collision and repulsion, thereby eliminating the need for complex motor acceleration/deceleration control and the creation of control pulse trains. This has the excellent effect of reducing power consumption.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a block diagram of a printer according to the prior art, Fig. 3 is a timing diagram of motor control pulses of a printer according to the prior art, and Fig. 4 is a diagram of a printer according to the present invention. FIG. 3 is a timing diagram of motor control pulses in FIG. 1... Step motor, 2... Wire, 3
...Head carriage, 4...Carriage guide, 5...Print head, 6...
...Print paper, 7...Head carriage, 8
...Panel, 16...Wire, 10.
...Elastic repulsion mechanism, 11...Constant velocity range,
12...Deceleration area, 13...Stop area, 1
4...Reverse acceleration area, 15...Potency 4 meters, 17.Old...Excitation stop timing, 18...
...Headkillage turning point, 19...
Excitation start timing, C...basic clock, φ
6. φ1. φO, φY...Each coil of the 4-phase step motor, X...Basic clock. Kaya 1st time 2nd picture (y-next printing) Q Sa 1st family also 1st

Claims (1)

[Claims] A serial printer comprising an elastic repulsion mechanism and a sensor for detecting the position of the printer head carriage at both ends of a printer head carriage travel path.