JPS60110463A - Drive system of printing wire driver using vibrating plate - Google Patents

Abstract

PURPOSE:To simplify the constitution of a drive system by using a system in which a vibrating arm is always vibrationally driven within a range of not collision with printing wires but collided with the printing wires during the formation of dots, and the rising speed during the formation of dots is increased. CONSTITUTION:The tip (master 5) of each vibrating arm 3 is faced at a given interval with the rear end (printing pin 10) of the printing wire 9. The arm 3 is designed to be vibrationally driven through an electromagnetic driver 11. The arm 3 is at reset position usually, and its tip 5 is vibrationally driven continuously and with a fixed period in an amplitude or range of not collision with the printing pin 10. When dots are formed, DC voltage is supplied to the moving coil 16 to advance the coil 16, and thereby the tip being vibrationally driven with the same amplitude as above collides with the pin 10 to advance the printing wire 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a driving method for a printing wire driving device in which the tip of a vibrating arm faces the rear end of a printing wire with a certain distance therebetween.

In the prior art, the vibrating arm is constantly vibrated at an amplitude and period of one foot by a vibration drive means, and the tip of the vibrating arm is opposed to the rear end of the printing wire with a certain gap,
There is a drive method in which an electromagnetic switching device provided at the base of the vibrating arm selectively displaces the tip of the vibrating arm between a position where it can collide with the rear end of the printing wire and a position where it cannot collide.

However, such a drive system has the drawback that it is essential to an electromagnetic switching device and requires a complicated device. In addition, in order to eliminate this drawback, the vibrating arm is constantly vibrated at a certain period with an amplitude within a range that does not cause it to collide with the printing wire, and when it is desired to form a dot, the amplitude becomes large. A method has been proposed in which amplitude control is performed so as to increase the voltage, but although this has the advantage of being able to be driven with a small current, it has the disadvantage that it takes time to rise.

It is an object of the present invention to provide a quick start-up and a simple configuration when forming a dot.

The structural feature of the present invention is that the vibrating arm is continuously vibrated by an electromagnetic drive means consisting of a coil and a magnet within a range where it cannot collide with the rear end of the printing wire, and when forming dots, the vibrating arm is driven to vibrate continuously within a range that does not collide with the rear end of the printing wire. The apparatus is configured so that a direct current voltage is supplied to move the tip of the vibrating arm to the forward position, and the vibration causes the tip of the vibrating arm to collide with the entire rear end of the printing wire to form a dot Th.

An embodiment of the present invention will be described below.

As shown in FIG. 1, on the diaphragm, there are a plurality of (seven in this example) extending radially inward from the annular base 2 on the outer periphery.
The vibrating arms 5 are integrally connected, and auxiliary vibrating arms 4 extending radially inward from the base 2 between the vibrating arms 3 are also integrally formed. The vibrating arm 3 is equipped with a mass 5 at its tip for adjusting its natural frequency,
The auxiliary vibrating arm 4 includes a mass 6 for balancing with the vibrating arm 5. This diaphragm unit has its base 2 supported by a support member 8 through screws 7 as shown in the second figure, and the tip end (mass 5) of each vibrating arm 6 is connected to the rear end of the printing wire 9. (Printing pin 10) and are opposed to each other with a sufficient distance between them. Each vibrating arm 5 is vibrated through the electromagnetic drive device 11. This electromagnetic drive device 11 includes a cylindrical outer yoke 13 attached to a support plate 12, a permanent magnet 14 fixed to the inner bottom of the outer yoke, and a disk-shaped outer yoke 14 fixed to the front surface of the permanent magnet. It consists of an inner yoke 15 and a moving coil 16 fixed to the middle part of the vibrating arm 3. The outer yoke 15 and the inner yoke 15 are magnetized with different polarities by the permanent magnet 14, and the moving coil 16 is inserted into the magnetic gap between the two yokes.

During normal times, each vibrating arm 3 is at the reset position (solid line position in Figure 2), and is vibrated continuously and at a constant cycle with an amplitude within a range that does not allow its tip to collide with the printing pin 10. - When you want to print, move forward to the set position (dash line position in Figure 2), so that the tip, which is being driven and captured with the same amplitude as above, collides with the printing pin 10, and this collision causes the printing wire 9 to move forward. It has become.

FIG. 3 shows an example of a drive circuit for controlling the entire vibrating arm 3 as described above, and the moving coil 16 as described above.
Each of the arms is connected to the drive circuit of FIG. That is, the moving coil 16 has one end connected to the power supply circuit, and the other end connected to the embargo terminals of the transistors TrI and Trl, and further connected to the transistor T.
A resistor R1+R1 is connected to the collector terminals of ry and Try, respectively. A print timing signal shown in FIG. 4A is supplied to the base terminal A of the transistor TrI. The cycle of this print timing signal is determined based on the natural frequency of the vibrating arm 6 of the diaphragm 1, and the print head is caused to scan in synchronization with this signal. In normal times, that is, when no dots are formed, a drive current is periodically applied to the moving coil 165- each time the transistor Trl is turned on by the print mapping signal, and as shown in FIG. The vibrating arm 3 is driven to vibrate in cooperation with the coil 16. At this time, the tip of the vibrating arm 3 is set at its stable rest position at the reset position shown by the solid line in FIG. Since the amplitude is larger than that of the tip, it does not collide with the printing pin 10 and no dots are formed. A DC' voltage is supplied to the base terminal B of the transistor Trl when it is desired to form a dot, as shown in FIG. 4B. By supplying this DC voltage to the moving coil 16, the vibrating arm 3 moves to the position of the vibrating arm 6' shown by the chain line in FIG. 2, and the stable rest position of its tip changes from the reset position to the set position. Advance. At this set position, the opposing distance between the mass 5' and the rear end of the printing pin 10 is smaller than the amplitude of the tip vibrating due to the printing marking signal, so at this time it collides with the printing pin 10, causing the printing The wire 9 advances and a dot is formed. Therefore, by supplying a DC voltage to the base terminal B of the transistor Try during head scanning, the tip of the vibrating arm 3 is switched from the reset position to the set position (for example, a 5×7 dot matrix) IJ
The characters in the text pattern can be formed arbitrarily and at very high speeds.

The driving method according to the present invention described in detail above is
When not forming, the vibrating arm is vibrated at the reset position at an amplitude within a range that does not contact the rear end of the printing wire,
When forming the dot If, the vibrating arm is advanced to the set position and is vibrated with the same amplitude to strike the printing wire, making it possible to print at a very high speed with low current consumption. Furthermore, the printing operation is stable, clear dots can be formed, and the structure is simple and can be provided at low cost.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front view of the printing wire drive device of the print head, Fig. 2 is a sectional view taken along the line ■-■ of Fig. 1, and Fig. 3 is an example. The drive circuit diagram shown in FIG. 4 is a meme chart diagram for explaining printing operation sounds. "... Vibration plate, 2... Base 5... Vibrating arm, 9... Printing wire 10... Printing pin, 11... Electromagnetic drive device, 16. Fist/outer yoke, 14. ...Permanent magnet, 15...Inner yoke, 16
...Moving coil. Applicant Seikosha Co., Ltd. Figure 8 ↓ Figure 4

Claims (1)

[Claims] In a printing wire driving device, the base is fixed and the tip of the vibrating arm extending from the base faces the rear end of the printing wire with a certain distance,
An electromagnetic drive device comprising a coil and a magnet is provided for continuously vibrating the vibrating arm at an amplitude within a range that does not allow the tip end to collide with the rear end of the printing wire during normal times;
When a dotted line is formed, a DC voltage is supplied to the coil to move the tip of the vibrating arm to a forward position so that the tip collides with the rear end of the printing wire when the electromagnetic drive device vibrates. □The drive system of the friendly printing wire drive device using a diaphragm with all the features.