JPS60262669A - Printing hammer - Google Patents

Abstract

PURPOSE:To provide a printing light in weight and capable of printing at high speed, which is reciprocated by both rapid expansion of an inert gas contained in a hermetically sealed container which expansion is effected by generating spark discharge in the container and a restoring force of the container. CONSTITUTION:A fixed electrode 18a is fixed to a central part of a rear frame 12, while a movable electrode 11a is fixed to the printing pin 10 by an electrical insulator 11b, and both of the electrodes 18a, 11a are provided facing to each other in the interior of the hermetically sealed container 13a having a bellows part, with an innert gas being sealed in the container 13a. A power source for generating corona discharge is connected to the electrodes 18a, 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing hammer, and more particularly to a printing hammer for a dot impact printer.

[Conventional technology]

In the printing hammer of a conventional dot impact printer, an electromagnetic actuator is used as a means for striking the printing bottle, and the printing bottle is caused to perform the striking movement by energizing the coil of the electromagnet. For example, the fifth
In the cross-sectional view of the conventional printing hammer shown in the figure, there is 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 2 and the yoke 6, and one end of the iron core 2 that is connected to the yoke 6.
and a printing hammer spring 4 which is connected to the printing hammer spring 4 by a bolt 8 and has a printing bottle 7 at the other end, and is usually attracted to the iron core 2 by a permanent magnet 5 against the elastic force of the printing hammer spring 4. Timing is performed by energizing the coil 3 to generate magnetic flux in a direction that cancels the magnetic flux by the permanent magnet 5, releasing the iron core 2, and by the elastic force of the printing hammer spring 4, the printing bottle 7
It is configured to print by hitting the ink ribbon and printing paper with the tip of the ink ribbon.

Therefore, with conventional printing hammers, there is a limit to increasing the printing speed due to the large moving parts.
Another disadvantage is that the driving force of the printing bottle is large, and furthermore, due to its configuration, components such as iron core, coil, permanent magnet, and yoke are essential, so it is necessary to reduce the weight of the printing hammer. It was difficult to reduce the size.

[The problem that the invention attempts to solve]

The present invention provides a printing hammer that is lightweight, compact, and has a high-speed printing function.

Means for Solving Problem C] A printing bottle having an embossing surface at its tip, a support means for movably supporting the printing bottle in the printing direction, and a means fixed to the support means to apply a driving force to the printing bottle. In the printing hammer, the driving means is provided with a fixed electrode attached to the supporting means, and a fixed electrode fixed to the printing bottle and opposed to the fixed electrode at a distance, and the driving means is electrically connected to the fixed electrode. A movable electrode that is insulated, a sealed container that covers the facing portions of the movable electrode and the fixed electrode, and an electrical 1! ! a first spring means for applying a gradient force at all times to minimize the internal volume of the sealed container, and for applying a voltage from the outside to the fixed electrode; and a second terminal for externally applying a voltage to the movable electrode.

The fluid is preferably an inert gas, the closed container has a structure in which a hollowed out part is formed in a part, and the spring means has a structure that utilizes the restoring force of the hollowed out part. I like U7.

Further, the closed container includes a cylinder fixed to the support means, and a piston fixed to the printing bottle and sliding in the cylinder, and the spring means is a coil spring provided between the piston and the support means. It is preferable that

[Effect]

A spark discharge is generated in a hermetically sealed container consisting of a hollowed part or a cylinder and a piston structure, and the expansion force due to the rapid expansion of the inert fluid in this hermetically sealed container and the restoring force given to the sealed container are generated. The reciprocating motion allows the printing bin to print.

〔Example〕

A perspective view of the appearance of a printing hammer according to a first embodiment of the present invention is shown in FIG.

In FIG. 1, the embossing portion of the printing bottle 10 protrudes from the guide member 16 to the right and is supported by the rear frame 12 and the front frame 14.

FIG. 2 (al) is a side view of the printing hammer seen from the printing bin 10 side, and FIG. 2 (bl) is an xy sectional view of the above figure.

21'a (in bl, the fixed electrode 18a is fixed to the center of the rear frame 12, and the movable electrode 1 is fixed by the printing bottle 10 and the electrical insulator 111).
1a is the outer skin part 13a of the airtight container and the rear flap 1.
, 14, and this space is filled with an electrically insulating and inert fluid (hereinafter referred to as pressure transmission medium) 20. Wooden brush - In the example, the outer skin part 1.3a of the sealed container is a hollowed part,
It has a restoring force that always keeps its internal volume to a minimum, and the pressure transmission medium 20 is an inert gas.

The distance between the fixed electrode 18a and the movable electrode 1.1a is such that it has an insulating distance necessary to generate a spark discharge using the inert gas 20 as a medium.

The right end of the fixed electrode 18a is the connection terminal 181), and the movable electrode +1a is connected to the terminal 17a and the terminal + with sliding contact.
7a).

FIG. 3 shows an example of a printing bin drive power supply circuit according to the present invention.

The electrical energy stored in the capacitor C by the DC power supply ■ and the series resistor R is instantaneously supplied to the step-up transformer Tb by the transformer Ta and the switching element S, and the electric energy is transferred between the fixed electrode 18a and the movable electrode 11a in Fig. 2 fb). Between,
Generates corona discharge. With this discharge energy,
The pressure transmission medium 20 causes a rapid rise in pressure, and the movable electrode 11a is moved to the left in the figure, and the printing pin 10
causes a striking action.

Since this pressure wave ends in a very short time only during corona discharge, the printing bottle is immediately returned to its position by the restoring force of the hero.

In general, the rate of pressure rise in a sealed container is proportional to the amount of energy released into the container within a unit time, and is inversely proportional to the cube root of the internal volume of the sealed container, so the resistance R shown in the third cabinet is The embossing force of the printing bottle can be adjusted by the emitted energy depending on the size of the capacitor C and the internal volume of the hollow.

Furthermore, since it is easy to obtain a switching time corresponding to the time constants of C and R, it is possible to provide a printing hammer that is faster, smaller, and consumes less energy than the conventional structure.

FIG. 4(a) shows a side view of a second embodiment of the present invention, and FIG. 4(bl) shows a sectional view of the same figure.

In this embodiment, the sealed container is composed of a front frame 14 having a cylindrical structure, an O-ring 21 that performs piston movement, and a printing bottle 10 that is slid on the inner cylinder of the front frame 14. The restoring force is obtained by a coil spring 22 inserted between the printing bottle 10 and the guide member 16, which is a supporting component. At this time, the front frame 14
A stopper member 23 is provided inside the movable electrode 11a to determine the position when the movable electrode 11a is restored.

〔Effect of the invention〕

By implementing the present invention, a printing hammer that is smaller, faster, and consumes less energy can be obtained.

[Brief explanation of drawings]

FIG. 1 is an external perspective view according to a first embodiment of the present invention. Fig. 2 (al is a side view of the above embodiment as seen from the printing pin side, and Fig. 3 (b) is a sectional view of the section X-X. Fig. 3 is a drive power supply circuit diagram. Fig. 4 (al is a side view of the above embodiment) Fig. 5 is a side view seen from the printing pin side according to the second embodiment, and [b] is a cross-sectional view of the section X-X. Fig. 5 is a cross-sectional view of the printing hammer of the conventional structure. 2... Iron core, 3 ... Coil, 4... Printing hammer spring, 5... Permanent magnet, 6... Yoke, 8... Screw,
10... Printing bottle, lla... Movable electrode, Ilb.
...Electrical insulator, 12... Rear frame, 13a...
- Outer skin part of the airtight container, 13b... Inner part of the airtight container, 14... Front frame, 16... Guide member, 17
a... Terminal for sliding contact, 17b... Drawer part,
18a... Fixed electrode, 18b... Connection terminal, 2o.
...Pressure transmission medium, 2]...0 ring, 22...Coil spring, ■...DC power supply, C...Content 4, R...Series resistance, S...Switching element , Ta
...Transformer, Tb...Step-up transformer, 1. ．． 1.
...Terminal. Patent Applicant NEC Corporation Agent Patent Attorney Nao Takashi Ide 17b 170' Tan 1 Figure (a) (b) M 2 Figure 10b 33 Sales by mouth 4 Figure

Claims (1)

[Scope of Claims] ji) A printing pin having an embossing surface at its tip, supporting means for movably supporting this printing pin in the engraving direction, and a driving means fixed to this supporting means for applying a driving force to the printing pin. In the printing hammer, the driving means has a fixed electrode attached to the supporting means, and a fixed electrode fixed to the printing pin, which is arranged to face the two fixed electrodes at an interval of 1 J, and from the fixed electrode to the fixed electrode. An electrically insulated movable electrode, a sealed container that covers opposing portions of the movable electrode and the fixed electrode, and an electrically insulating and inert fluid filled in the sealed container. and a spring means that constantly applies a gradient force so that the internal volume of the sealed container is minimized, a first terminal for externally applying a voltage to the fixed electrode, and a movable A printing hammer characterized by comprising a second terminal for externally applying a voltage to the electrode. (2) The fluid is an inert gas.
Printing hammer described in section. (3) The airtight container has a structure in which a hollowed out portion is formed in a part thereof, and the spring means has a structure that utilizes the restoring force of the hollowed out portion. printing hammer. (4) The closed container includes a cylinder fixed to the support means;
a piston fixed to a printing pin and sliding in the cylinder, and the spring means is a coil spring provided between the piston and the support means.
Printing hammer described in item 1).