JPH0616755Y2 - Print head for wired cyto printer - Google Patents

Description

Detailed Description of the Invention [Outline] Regarding the structure of a print head for a wire dot printer, the armature and the armature are opposed to each other and excited for the purpose of improving the brazing property of the print wire and the reliability during operation. And a print magnet for driving the armature, and a platinum clad tungsten print wire having one end brazed to the armature.

[Industrial application field]

The present invention relates to the structure of a print head for a wire dot printer.

2. Description of the Related Art Recently, serial printers that print characters or the like by using dots are widely used in input / output terminals of data processing devices and word processors.

High reliability is demanded for such a printer.

[Conventional technology]

A print head for a wire dot printer (hereinafter referred to as a print head) 1 has a frame body in which a plurality of print magnets 2 concentrate print wires 6 in the central portion and project in the central portion, as illustrated in the side sectional view of FIG. The wire guide 4a fixed to the tip of the wire 4 is aligned at a predetermined position.

The printing wire 3 is fixed to the tip of the beam 8 by means such as brazing, as shown in the partially enlarged perspective views of FIG. 3 and FIG.
The beam 8 is fixed to the tip of the amateur 5.

The armature 5 is made of a magnetic material, is elastically supported by the leaf springs 6 arranged radially, and faces the core 7 of the print magnet 2 as shown in FIG.

A coil 9 is wound around the core 7 to form an electromagnet, a magnet base 10a and a yoke 10b provided in the core 7 are provided with a permanent magnet 11 between them, and the magnetic path portion 1 is provided on the yoke 10b.
0c is arranged to form a loop-shaped magnetic path as indicated by an arrow together with the core 7 and the amateur 5.

Therefore, when the print magnet 2 is not operating, the armature 5 is attracted to the core 7 due to the magnetic force of the permanent magnet.

Here, when a current is applied to the print magnet 2 so that the NS pole of the permanent magnet 11 and the pole of the core 7 are opposite to each other, the core 7 serves as an electromagnet so as to cancel the attraction of the permanent magnet 11.

Then, the amateur 5 jumps upward in the figure due to the energy stored in the leaf spring 6.

At the same time, the printing wire 3 also projects from the wire guide 4a.

In this way, printing is performed by selectively driving the plurality of print magnets 2 in the print head 1.

[Problems to be solved by the device]

As described above, the printing wire is fixed to the beam by means such as brazing, but its material has a high Young's modulus,
Uses tungsten, which has excellent wear resistance and is inexpensive.

However, tungsten has poor wettability when brazing,
There is a problem that the brazing is incomplete and the brazing portion with the beam peels off at a high frequency during the printing operation.

The present invention is intended to improve the brazing property of a printing wire and the reliability during operation.

[Means for Solving the Problems]

In order to achieve the above object, in the present invention, as shown in the side sectional view of FIG. 1, an armature 5 and a print magnet 2 facing the armature 5 and driving the armature by exciting the armature 5. The armature 5 comprises a platinum clad tungsten printing wire 12 whose one end is brazed.

[Action]

The print wire has improved wettability during brazing while maintaining the excellent properties of tungsten.

〔Example〕

 FIG. 1 shows an embodiment of the present invention.

The same portions are denoted by the same reference numerals throughout the drawings.

As shown in the side sectional view of FIG. 1, the print head 13 according to the present invention includes an armature 5, a print magnet 2 facing the armature 5 and driving the armature by exciting the armature, as in the prior art. Beam 8 at the tip of 5
The printing wire 12 is brazed at one end through the printing wire 12, and the printing wire 12 is a platinum clad tungsten wire.

The platinum-clad tungsten wire is a layered composite alloy in which platinum is superposed on a tungsten wire and both are completely bonded, and has the excellent characteristics of both tungsten and platinum, and complements the drawbacks.

Therefore, by using a platinum clad tungsten wire for the printing wire 12, while maintaining the high Young's modulus of the tungsten wire that was possessed by the prior art, the wettability at the time of brazing due to the clad platinum As a result, it is possible to withstand the stress due to the rotational moment during the printing operation and to perform highly reliable brazing that does not cause separation from the beam 8 during driving.

[Effect of device]

By applying the present invention, the reliability of the brazing of the printing wire is improved, and the obstacles during the printing operation of the print head can be reduced. Play.

[Brief description of drawings]

FIG. 1 is a side sectional view of a print head of the present invention, FIG. 2 is a side sectional view of a conventional print head, and FIG. 3 is a partially enlarged perspective view of a brazing portion of a print wire. In the figure, 1 and 13 are a print head, 2 is a print magnet, 3 and 12 are print wires, 4 is a frame, 4a is a wire guide, 5 is an armature, 6 is a leaf spring, 7 is a core, and 8 is a beam. , 9 is a coil, 10a is a magnet base, 10b is a yoke, 10c is a magnetic path portion, and 11 is a permanent magnet.

Claims (1)

[Scope of utility model registration request] 1. An armature (5), a print magnet (2) facing the armature (5) and driving the armature by exciting the same, and a platinum clad tungsten having one end brazed to the armature (5). And a print wire (12) for a wire dot printer.