JPH01192565A - Printing head for wire dot printer - Google Patents

Abstract

PURPOSE:To obtain a printing head of high efficiency without bringing about an increase in size, by a method wherein a printing wire is composed of an armature formed by a superconductive member held at its one end, a core opposed thereto, and a coil wound on the core. CONSTITUTION:A printing head 19 is composed of an armature 18 formed by a superconductive member of which with one end a prinring wire 3 is held, a plate spring 7 of which to one end the armature 18 is fixed, a core 18 opposed to the armature 18, a yoke 17 to which the other end part of the spring member 7 is fixed with a set screw 10 and the core 13 is fixed, and a coil 16 wound on the core 13. When the coil 16 is excited on a printing signal, intensive eddy current is generated on a surface of the armature 18 opposed to the core 13, and thereby the armature 18 intensively repels the core 13 to spring up the printing wire 3 against energizing of the plate spring 7. Then, when excitation of the coil 16 is turned off, the armature 18 returns to an initial position by energizing of the plate spring 7. Therefore, efficiency is improved and besides miniaturization becomes possible.

Description

[Detailed Description of the Invention] [(Required)] The present invention relates to the structure of a print head used in a wire dot printer, and for the purpose of improving efficiency, it comprises an armature made of a superconducting member holding a print wire at one end, and an armature in the armature. It consists of opposing cores and a coil wound around the core.

[Industrial application field]

The present invention relates to the structure of printheads used in wire dot printers.

2. Description of the Related Art In recent years, wire dot printers that form characters using dots have been widely used as printers for various computer terminals and word processors.

Among them, serial dot printers record characters by forming dots, so there are many types of characters, etc., and it is suitable for office automation (○A:0frice
It is increasingly being used as a terminal device in mobile applications.

There is a demand for improved efficiency in these printers.

[Conventional technology]

As shown in the perspective view of FIG. 2, the print head 1 includes an armature 6 that holds the print wire 3 via a beam 5 (or directly), and a spring member (hereinafter referred to as a temporary spring) fixed to one end of the armature 6. (referred to as slope spring) 7 and leaf spring 7
A clamper 8 clamps the other end from both sides, and a set screw 10 is used to secure the temporary spring 7 to one end of the clamper 8 through a through hole 9a of a cover 9 placed over the clamper 8, and the center part is clamped to the armature. A side magnetic path (bypass) 11 that protrudes to opposing positions on the sides of the armature 6, a yoke 12 that supports the side magnetic path 11, a core 13 facing the armature 6, and a permanent magnet between the yoke 12 and the core 13. It consists of a yoke 14 connected via a yoke 15 and a coil 16 wound around a core 13.
From armature 6 to side magnetic path 11, yoke 12, permanent magnet 1
5. It forms a closed magnetic path through the yoke 14 and the core 13 to the armature.

Therefore, when the coil 16 is not energized, the Amadeur 6 is attracted to the core 13 by the magnetic path of the permanent magnet 15 in the counterclockwise direction as indicated by the arrow A, and the NS of the permanent magnet 15 is
When the coil 16 is excited such that the poles of the core 13 are opposite to those of the core 13, the core 13 becomes an electromagnet and generates a clockwise magnetic flux as shown by arrow B, which acts to cancel the attractive force of the permanent magnet 15.

For this reason, the amateur 6 uses the energy stored in the leaf spring 7 to flip the printing wire 3 upward in the figure, and prints on the printing paper via an ink ribbon or the like.

[Problem to be solved by the invention]

As explained above, the print head is equipped with a permanent magnet.

For this reason, when the printing magnet is excited, this permanent magnet acts as magnetic resistance, obstructing the flow of magnetic flux in the magnetic circuit and reducing efficiency.

To solve this problem, the permanent magnet is eliminated and the armature is made of a solid material such as copper or aluminum. Eddy current is generated in the armature by the opposing electromagnets, and the printing wire is moved by anti-gravity. You can try to flip it up, but
The problem is that the eddy current generated in this case is small, and in order to obtain sufficient anti-18 force, the coil or armature must be made larger or a large current must be passed, resulting in an increase in size and current consumption. was there.

An object of the present invention is to provide a highly efficient print head without increasing its size.

[Means to solve the problem]

FIG. 1 is a perspective view of the wire dot blink print head of the present invention.

The present invention comprises an armature 18 made of a superconducting member holding the printing wire 3 at one end, a core 13 facing the armature 18, and a coil 16 wound around the core 13.

[Effect]

When the coil is energized, a strong eddy current is generated on the surface of the armature that faces the core and has zero electrical resistance.

This eddy current causes the armature to move strongly against the core, resisting the bias of the temporary spring and flipping up the printing wire.

Next, when the coil is de-energized, the armature returns to its initial position due to the bias of the temporary spring.

〔Example〕

FIG. 1 shows an embodiment of the present invention.

Identical parts are designated by the same reference numerals throughout the figures.

As shown in the perspective view of FIG. 1, the print head 19 according to the present invention includes an armature 18 made of a superconducting member holding a print wire 3 at one end, a leaf spring 7 fixing the armature 18 to one end, and an armature Core 13 facing 18
, a yoke 17 that fixes the other end of the spring member 7 with, for example, a set screw 10 and fixes the core 13, and a coil 1G wound around the core 13.

That is, in the present invention, the armature 18 is formed of a superconducting member, and is constantly cooled by a cooling device (not shown), so that the electrical resistance is zero.

When the coil 16 is excited based on the print signal, a strong eddy current is generated on the surface of the armature 18 facing the core 13.

This eddy current causes the armature 18 to move strongly against the core 13 (against IB), against the bias of the leaf spring 7, against the printing wire 3.
Jump up.

Next, when the excitation of the coil 16 is cut off, the armature 18 returns to the initial position due to the bias of the temporary spring 7.

Printing is performed by intermittent excitation of the coil 16 as described above.

〔Effect of the invention〕

As explained above, in the wire dot printer print head of the present invention, since no permanent magnet is involved in the magnetic circuit, the flow of magnetic flux due to magnetic resistance is not inhibited.

Additionally, armatures made of superconducting materials generate larger eddy currents than armatures made of conventional materials such as cavities or aluminum, improving efficiency.

Therefore, miniaturization becomes possible, which has great economic and industrial effects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a print head for a wire dot printer according to the present invention, and FIG. 2 is a perspective view of a conventional print head for a wire dot printer. In the figure, 1.19 is the print head, 3 is the print wire, 5 is the beam, 6 is the armature, 7 is the spring member (leaf spring), 8 is the clamper, 9 is the cover, 10 is the set screw, 11 is the side magnetic path, 12 is a yoke,
13 is the core, 14.17 is the yoke,
15 is a permanent magnet, 16 is a coil, and 18 is an armature made of a superconducting member.

Claims (1)

[Claims] An armature (18) made of a superconducting member holding a printing wire (3) at one end; a core (13) facing the armature (18);
A print head for a wire dot printer, comprising a coil (16) wound around the core (13).