JPS60145872A - Printing hammer - Google Patents

Abstract

PURPOSE:To make high-speed printing possible by sealing two pieces of electrode and pressure transfer medium in a hermetically sealed container and transferring pressure generated by an electric discharge to a movable part through a medium and, in turn, driving a printing pin. CONSTITUTION:An electric charge accumulated in a condenser C from a DC power supply V through a resistor R is caused to run to the primary side of a boosting transformer Tb by an instantaneous closing action of a switching element S. Next, the electric charge is boosted by the secondary side of the transformer Tb and then is discharged between two electrode 11-1, 11-2 opposed to each other holding an appropriate space at the end of a hermetically sealed container 12. Consequently, heat is generated in a pressure transfer medium 18 in the neighborhood of the electrode to increase the pressure. Following this process, the pressure is conveyed to a thin pressing part 12a of a container 12, pressing the tip of a protrusion 14b of a printing pin 14 for printing action.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing hammer, and more particularly to a printing hammer for a dot impact printer.

The printing hammer of a conventional dot impact printer uses an electromagnetic actuator as a means to drive the striking motion of the printing bottle that performs the striking action for printing, and supplies a driving current to the electromagnetic coil to drive the printing bottle. A driving means is used to effect the percussion movement. For example, the first
The printing hammer of a dot impact line printer as illustrated in the figure consists of an iron core 2 with a coil 3 wound around the outer periphery of the tip, a permanent magnet 5 that constantly supplies magnetic flux to the iron core, and a magnetic flux generated by this permanent magnet 5 or a coil. The printing hammer spring 4 has one end connected to the yoke 6 with a bolt 8 and a printing pin 7 on the other end. 5 attracts the printing hammer spring 4 to the iron core 2 against its elastic force, and when printing, the coil 3 is energized to generate a magnetic flux in a direction that cancels the magnetic flux produced by the permanent magnet 5. The suction force to 2 is released and the printing movement is performed by the elastic force of the printing hammer spring 40, and the tip of the printing bottle 7 hits the ink ribbon and the printing paper to print.

Therefore, conventional printing hammers have the disadvantage that there is a limit to increasing the printing speed due to the large mass of the movable parts, and the input energy required to drive the printing pins is also large. , permanent magnet, yoke, etc. are lacking in EJ, so the weight of the printing hammer is
It has the disadvantage that it is difficult to reduce the weight and size of the device.

In order to eliminate the drawbacks of the electromagnetic printing hammer described above, the present invention provides two electrodes in a sealed container and a medium for transmitting the pressure generated when high pressure is applied and discharged between the electrodes. The present invention provides a printing hammer using a discharge type (spark type) drive system, which is configured such that pressure due to discharge is transmitted by the medium to a movable part provided in the sealed container, and a printing bottle is driven by the movable part. As a result, it is possible to provide a printing hammer using a new printing bin drive system that enables high-speed printing and is also compact and lightweight.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a diagram showing the first embodiment of the present invention, and FIG.
) is a front view of the printing hammer seen from the printing pin side, and FIGS. 2(b) and (C) are sectional views showing the X-X cross section and the Y-Y cross section shown in FIG. 2(a). .

As shown in the figure, two electrodes 11-1 and 11-2, which face each other with a suitable gap at their ends, are connected to each other through insulators 13-1 and 13-2'1ii7, respectively.
12. As shown in Fig. 3, the outer part of the chip 12 has a circular cross section at the top and bottom, but the central part has one side crushed and has a flat shape. (See FIG. 2C), this flattened portion (hereinafter referred to as the suppressing portion) 12a is thinner than other portions. The tube 12 has an inert liquid or gas (hereinafter referred to as a pressure transmission medium) 18 sealed therein and is fixed to the frame 17 with an adhesive 19.

The printing pin 14 has one end attached to the pressing part 12 of the tube 12.
a, the tip of the other end forms a printing part 14a, a guide 15 (made of a hard material so as not to cause wear due to the movement of the printing pin 14) and a frame. 17 and can move left and right, and normally a pressing force is applied by a spring 16 so that the tip of the protrusion 14b comes into contact with the suppressor 12aK.

Next, the jj-b operation of the printing hammer configured as described above will be explained.

FIG. 4 shows an example of a drive circuit for driving the printing pins of the embodiment shown in FIG. The electric charge accumulated in the capacitor C by the DC power supply VK via the resistance ratio is transferred to the step-up transformer Tb by the momentary stop operation of the switching element S.
The voltage flows to the next side, is boosted by the secondary side of the step-up transformer Tb, and is discharged between electrodes 11-1 and 11-2. This discharge generates high heat in the pressure transmission medium 18 near the electrode, increasing the pressure, and this pressure is propagated into the tube 12, but as described above, the thickness of the suppressing part 12a becomes thinner than other parts. Because of this, it is elastically deformed and presses the tip of the protrusion 14b of the printing pin 14.

This causes the printing pin 14 to move outward against the spring 16 to perform a printing operation, and as the pressure within the tube 12 decreases, the force of the spring 16 causes the printing pin 14 to return to its original position. The switching element S performs an opening/closing operation by the pulse applied to the terminals t1 and t2, and therefore the electrodes 11-1 and 11-2 discharge in synchronization with this pulse. The printing operation of the printing pin 14 can be controlled by the pulse applied to t2.

As is clear from the above description, the only movable part of this printing hammer is the printing pin 14, and its weight can be made extremely lighter compared to the movable part of conventional electromagnetic printing hammers. , it is possible to perform repetitive printing operations at high speed.

Also, although high voltage is required to generate discharge in the electrodes 11-1 and 11-2, the applied pulse width can be extremely short, and the required current value is also small, so printing can be performed with low input energy. be able to.

FIG. 45(a) is a plan view of the second embodiment of the present invention, and FIG. 5(b) is a sectional view taken along line XX in FIG. 5(a).

In this embodiment, the tips of the electrodes 21-1 and 21-2 are connected to a recess 2 formed at the front center of the container 22 made of an elastic material such as metal or rubber and the rear frame 27-2.
It is located in a sealed space consisting of 7-2a,
A preloaded pressure transmission medium 28 is sealed inside this sealed space. The rear edge 22b of the container 22 is adhered to the inner wall of the front frame 27-1, and the body is brought into close contact with the inner wall surface of the front frame by the preload of the pressure transmission medium 28. The tip 22a of the container 22 has a bellows shape so that it can expand and contract, and when electric discharge occurs between the electrodes 21-1 and 21-2, it expands and contracts due to the pressure. Note that the tips of the electrodes 21-1 and 21-2 are arranged at positions where pressure during discharge is most efficiently transmitted to the tips 22aK.

The printing bottle 24 has a structure similar to that of the first embodiment, and the tip of one end forms a printing part 24a, and the other end forms a pressing part 24bi, which receives the pressure of a spring 26. It can make reciprocating motion by contacting the tip 22a of the container 22 and being guided by the guide member 25 and the front frame 27-1.

The printing hammer configured as described above is connected to the electrodes 21-1 and 21-2 by a drive circuit as illustrated in FIG.
When a discharge is caused between the ends, the pressure generated by this discharge causes the tip portion 22 to
a extends to the left and pushes the suppression part 24b, so the printing bin 2
4 moves to the left against the force of the spring 26 to perform a printing operation, and as the pressure due to discharge decreases, the force of the spring 26 returns to the original position.

As explained in detail above, the use of the printing hammer of the present invention has the advantage that it is possible to print at high speed compared to conventional electromagnetic drive type printing hammers, and also to obtain a smaller and larger printing hammer. This has the effect of providing an economical printing hammer because it requires less human energy.
Therefore, by employing the printing hammer of the present invention, it is possible to obtain a dot impact printer that is fast, compact, lightweight, and economical.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a conventional electromagnetic printing hammer, and FIGS. 2(a), (b), and (C) are front views showing a first embodiment of the present invention, and a cross section taken along line X-X. Figure 3 is a perspective view showing the appearance of the tube in Figure 2,
FIG. 4 is a circuit diagram of an example of a drive circuit that drives the embodiment of FIG. 2, and FIGS. 5(a) and (b) are a plan view and a cross-sectional view taken along line be. In the figure, 2...iron core, 3...group/coil,
4...Printing hammer, 5...Permanent magnet,
6... Yoke, 7... Printing bottle, 11-
1.11-2... Den! 1, 12...Tube, 13-1.13-2...Insulator, 14
...Printing bottle, 15...Guiding member, 1
6... Spring, 17... Frame, 18... Pressure transmission medium, 19... Adhesive, 21-1.21-2 Old... Electrode, 22...
° Container, 24 River, printing bottle, 25 Guide member, 26 Spring, 27-1 Group front frame, 27-2・Rear frame,
28...Pressure transmission medium. ＃3 Figure Tmu 4th - (α) 27-2 Morning S Flash

Claims (1)

[Claims] two electrodes arranged at an appropriate interval at their tips; a sealed container having a locally movable part and enclosing the tips of the two electrodes and a pressure transmission medium therein; a printing bottle having a suppressing part that contacts the locally movable part; a spring that presses the printing bottle against the locally movable part with a predetermined pressure; a guide member that guides the movement of the printing bottle; and a frame that guides the movement of the hammer and holds the sealed container.