JPH05185613A - Wire dot printer - Google Patents

Abstract

PURPOSE:To provide a wire dot printer which can reduce damage of parts by wear and tear and improve reliability, by a method wherein the title printer possesses a printing module into which dot pins becoming a set are incorporated so that a space between one end of coil bases soldered to each other becomes wider than a space of the other end to which the dot pin is soldered. CONSTITUTION:In a printing module possessing constitution wherein two coil bases to which dot pins 1 marking a blank through a pin guide are adjoined and juxtaposed to each other as a set movably respectively, at least the one side dot pin 1 is joined to a side of the coil base 2 by tilting from a horizontal surface and constituted of a printing module assembled so that a space between the top of the coil bases in a moving direction of the dot pin becomes wider than a space between the dot pins becoming the set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving coil type wire dot printer, and more particularly to a printing module thereof.

Nowadays, with the use of computers and word processors, printers connected to them are frequently used as external outputs of computer calculation results or word processor text creation results.

One of the types of printers is a moving coil type wire dot printer. Moving coil type wire dot printers are widely used because they are inexpensive, but high density mounting of printing module components is required to increase dot density and improve printing quality, and high reliability is required accordingly. Has been done.

[0004]

2. Description of the Related Art FIG. 3 is a view showing a conventional example, FIG. 3 (a) is a side view showing a printing module before assembly, and FIG. 3 (b) is a printing module after assembly. It is a figure.

As shown in FIGS. 3A and 3B, a printing module of a conventional moving coil type wire dot printer has a coil base having a coil 3 and a back stopper 4, and a dot pin 1 brazed thereto. 2, a coil base support portion 6 welded to the coil base 2 and further welded to the leaf spring 5, a leaf spring support portion 7 welded to fix the leaf spring 5 to the base 11, and a dot pin. 1
A base 11 having a pin intermediate guide 8 and a pin guide 9 for inserting and penetrating, and a plurality of permanent magnets 10 fixed at regular intervals, and a back stopper 4.
It is composed of a stopper 12 located on the upper part of the.

The coil base supporting portion 6 is so arranged that the dot pins 1 brazed to each of the pair of coil bases 2 penetrate the pin intermediate guide 8 provided in the base 11 and are inserted into the pin guide 9. Screw 1 on base 11
The coil bases 2 are fixed to each other and the pair of coil bases 2 are installed between the permanent magnets 10 fixed to the base 11.

Further, the stopper 12 is installed so as to press the back stopper 4 at all times when the coil 3 is demagnetized. At the time of printing, by exciting the coil 3 of the coil base 2 to which the dot pin 1 capable of forming a dot to be printed is brazed, the coil 3
The coil base 2 is pushed down due to the relationship between the current flowing through the coil and the magnetic field of the permanent magnet 10, so that the dot pin 1 moves into the pin guide
Is printed by tapping the paper through the ribbon.

When the coil 3 is demagnetized thereafter, the coil base 2 and the dot pin 1 are restored to their original state by the elastic force of the leaf spring 5 welded to the coil base 2 having the coil 3 via the coil base support portion 6. Return to position.

Conventionally, the coil base 2 and the dot pin 1
At the time of brazing, the brazing was performed so that the side surface of the coil base 2 and the dot pin 1 were horizontal. However,
When the coil 3 is excited for printing, when the coil base 2 to which the coil 3 is attached and the dot pin 1 brazed thereto are both pushed down, the coil base support portion welded to the coil base 2 is pressed. Since 6 is a thin member having elastic force, the coil base 2 vibrates, and the portion of the coil base 2 near the back stopper 4 and the back stopper 4 of the other coil base 2 forming a pair.
Rubbing with nearby parts.

When the coil 3 is demagnetized, the coil base 2 to which the dot pin 1 is brazed returns to its original position, and the stopper 12 comes into contact with the back stopper 4 of the coil base 2.

[0011]

Therefore, the coil base 2 and the back stopper 4 of the coil base 2 are worn by the printing operation, which causes the back stopper 4 to be damaged.

If the back stopper 4 is damaged, the printing function is impaired and the printing module must be replaced. Further, the damage of the back stopper 4 depends on mechanical wear, and there is a variation in the period until the damage occurs depending on the frequency of use of the dot pin 1 in printing, so that the reliability is lacking and the life is also varied.

The present invention has a printing module incorporated so that the distance between the ends of the coil bases to which the pair of dot pins are brazed is wider than the distance between the ends of the coil bases to which the dot pins are brazed. Accordingly, it is an object of the present invention to provide a wire dot printer that can reduce damage to parts due to wear and improve reliability.

[0014]

FIG. 1 shows the principle of the present invention. In the figure, 1 is a dot pin, and the dot pin 1 hits a sheet through a ribbon to print on the sheet.

Reference numeral 2 is a coil base to which the dot pins 1 are brazed and the coils 3 are attached.

[0016]

According to the present invention, as shown in FIG. 1, the dot pins 1 are brazed to the coil base 2 so as not to be horizontal, and they are formed into two sets, and the coil base 2 at one end forming the set. The intervals between them are parallel, and the interval between the dot pins 1 at the other end is wider than the interval at one end.

Therefore, if this set is installed such that the coil base 2 is between the permanent magnets 10 fixed to the base 11, and the dot pin 1 is inserted through the pin intermediate guide 8 and inserted into the pin guide 9. , The pin intermediate guide 8 and the pin guide 9 are on a straight line, and the pair of them are parallel to each other, so that the interval between the dot pins 1 is constant,
The distance between the coil bases 2 at one end is increased.

Therefore, during the printing operation, the frequency of rubbing between the coil bases 2 forming a pair is reduced, and therefore,
By reducing the abrasion due to the friction between the coil bases, it is possible to prevent the back stopper 4 from being damaged.

[0019]

Embodiments will be described in detail below with reference to the drawings. FIG. 2 is a diagram showing an embodiment of the present invention.

FIG. 2A is a diagram showing the printing module before assembly. As shown in FIG. 2, dot pins 1 are provided on each of a pair of coil bases 2 arranged so that their side surfaces are parallel to each other. Are brazed, and the dot pins 1 thereof are not horizontal to the side surface of the coil base 2, and the interval of the other end is wider than the interval of the one end brazed to the coil base 2, so that the dot pins 1 do not interfere with each other. It is in such a state.

As in the prior art, the permanent magnets 10 are fixed to the base 11 at regular intervals, and the base 11 has pin intermediates for inserting the dot pins 1 corresponding to the respective dot pins 1. The guide 8 and the pin guide 9 are perforated so that they are aligned and parallel to each other.

At the upper end opening of the pin intermediate guide 8 that is perforated in the base 11, the dot pins 1 with a widened space are provided.
Is chamfered for easy insertion. Figure 2
(B) is a view showing the printing module after assembly, and as shown in the drawing, the set of coil bases 2 includes the permanent magnets 10.
The dot pins 1 installed between and brazed to the respective coil bases 2 are inserted into the respective pin intermediate guides 8 and 9, and the stopper 12 has a back stopper which the coil base 2 has in a non-printed state. Four
It is installed so as to lightly press.

Further, in the figure, one of the coil bases 2 to which a pair of dot pins 1 on the left end is brazed shows a printing state, and the dot pins 1 hit the paper from the pin guide 9 via the ribbon. Is jumping out for.

When the dot pin 1 is inserted into the pin middle guide 8 and the pin guide 9, the coil base supporting portion 6 attached to the coil base 2 to which the dot pin 1 is brazed is made of a thin and elastic material. Therefore, the coil base support portion 6 is twisted, the dot pins 1 forming a set are parallel to each other, and the respective coil bases 2 are
The back stopper 4 is opened.

In the present invention, the coil bases 2 forming the set are brazed so that the side surface of the coil base 2 and the dot pin 1 are not horizontal, but only one coil base 2 forming the set is brazed. Further, the dot pin 1 may be brazed so as not to be horizontal with the side surface of the coil base 2 and to be wider than the space between the coil bases 2.

Further, the coil bases 2 forming the set are arranged so that their side surfaces are parallel to each other, and the dot pins 1 are brazed to the coil base 2 so that they are not horizontal to the side surfaces of the coil base 2. Dot pin 1 which is not the side
By brazing to the coil base 2 so that the distance between the ends of the dot is wider than the distance between the coil bases 2, and inserting the dot pin 1 into the pin intermediate guide 8 and the pin guide 9,
Although the dot pins 1 are parallel to each other and the distance between the back stoppers 4 of the coil base 2 is increased, the distance between the back stoppers 4 of the coil base 2 is made wider than the distance between the dot pins 1 from the beginning, Even if the dot pins 1 are inserted into the pin intermediate guide 8 and the pin guide 9 by brazing to the coil base 2 while keeping the pins 1 parallel to each other and fixing the coil base 2 so as to be oblique to the base 11. Good.

[0027]

As described above, according to the present invention, it is possible to reduce the friction due to the printing operation between the coil bases constituting the printing module of the wire dot printer and the resulting damage to the parts. It greatly contributes to improving the reliability and extending the life of the dot printer.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention, FIG.
FIG. 4B is a diagram showing the print module before assembly, and FIG. 8B is a diagram showing the print module after assembly.

FIG. 3 is a view showing a conventional example, FIG. 3 (a) is a side view showing a printing module before assembly, and FIG.
It is a figure which shows the printing module after an assembly.

[Explanation of symbols]

 1 Dot Pin 2 Coil Base 3 Coil 4 Back Stopper 5 Leaf Spring 6 Coil Base Support 7 Leaf Spring Support 8 Pin Intermediate Guide 9 Pin Guide 10 Permanent Magnet 11 Base 12 Stopper 13 Screw

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Katayama 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited

Claims (1)

[Claims] 1. A printing module having a structure in which two coil bases connected to dot pins (1) for stamping a sheet through pin guides (8, 9) are movably and juxtaposed, respectively, as a set. One of the dot pins (1) is connected to the side surface of the coil base (2) by inclining it from a horizontal surface so that the interval between the upper ends of the coil base in the moving direction of the dot pins is wider than the interval between the pair of dot pins. A wire dot printer having an assembled printing module.