JP2888002B2 - Wire dot printer - Google Patents

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.

[0002] At present, with the use of computers and word processors, printers connected to them are frequently used as external outputs of calculation results by a computer or text creation results by a word processor.

[0003] One type of such printers is a moving coil type wire dot printer. Moving coil type wire dot printers are widely used because they are inexpensive.However, high density mounting of the printing module components is required to increase dot density and improve printing quality, which requires high reliability. Have been.

[0004]

2. Description of the Related Art FIG. 3 is a view showing a conventional example. FIG. 3A is a side view showing a print module before assembly, and FIG. 3B is a view showing a print module after assembly. FIG.

As shown in FIGS. 3 (a) and 3 (b), a printing module of a conventional moving coil type wire dot printer has a coil 3 and a back stopper 4, and a coil base on which dot pins 1 are soldered. 2, a coil base support 6 welded to the coil base 2 and further welded to the leaf spring 5, a leaf spring support 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 the base 11, a plurality of permanent magnets 10 being fixed at fixed intervals, and a back stopper 4.
Is formed of a stopper 12 located at the upper part of.

[0006] The coil base supporting portion 6 is formed in such a manner that the dot pins 1 brazed to each of the set of coil bases 2 penetrate the pin intermediate guide 8 of the base 11 and are inserted into the pin guides 9. Screw 1 on base 11
3, and a set of the coil bases 2 is provided between the permanent magnets 10 fixed to the base 11.

Further, the stopper 12 is installed so as to always press the back stopper 4 when the coil 3 is demagnetized. At the time of printing, by energizing the coil 3 of the coil base 2 to which the dot pin 1 capable of hitting a dot to be printed is soldered, 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, and the dot pin 1 is
And it is printed by hitting the paper through the ribbon.

After that, when the coil 3 is demagnetized, the coil base 2 and the dot pin 1 are returned to the 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 6. Return to position.

Conventionally, a coil base 2 and a dot pin 1
At the time of brazing, the side surface of the coil base 2 and the dot pin 1 were brazed so as to be 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 pushed down together, the coil base support portion welded to the coil base 2 Since the coil base 2 is a thin and elastic member, the coil base 2 vibrates, and a portion near the back stopper 4 of the coil base 2 and the back stopper 4 of another coil base 2 forming a set.
Rubbing with nearby parts.

When the coil 3 is degaussed, the coil base 2 to which the dot pins 1 are brazed returns to its original position, and the back stopper 4 of the coil base 2 contacts the stopper 12.

[0011]

Accordingly, the coil base 2 and the back stopper 4 thereof are worn by the printing operation, thereby causing a problem that the back stopper 4 is 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 abrasion, and there is a variation in the period leading to the damage depending on the frequency of use of the dot pins 1 in printing. Therefore, the reliability is lacking and the life is also varied.

The present invention has a printing module incorporated such that the interval between one ends of the coil bases to which the set of dot pins are soldered is wider than the interval between the other ends to which the dot pins are soldered. Accordingly, an object of the present invention is to provide a wire dot printer capable of reducing damage to components due to wear and improving reliability.

[0014]

FIG. 1 is a diagram illustrating the principle of the present invention. In the figure, reference numeral 1 denotes a dot pin, and when the dot pin 1 hits a sheet via a ribbon, printing is performed on the sheet.

Reference numeral 2 denotes a coil base on which the dot pins 1 are soldered and the coils 3 are mounted.

[0016]

According to the present invention, as shown in FIG. 1, a dot pin 1 is brazed to a coil base 2 so as not to be horizontal, and a pair of them is formed, and the coil base 2 at one end of the set is formed. The interval between them is parallel, and the interval between the dot pins 1 at the other end is wider than the interval at one end.

Therefore, when this set is installed such that the coil base 2 is located 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 since they form a pair, the interval between the dot pins 1 is constant,
The distance between the coil bases 2 at one end increases.

Therefore, during the printing operation, the frequency of rubbing between the coil bases 2 forming a pair is reduced.
Since the wear due to friction between the coil bases is reduced, breakage of the back stopper 4 can be prevented.

[0019]

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

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

As in the prior art, permanent magnets 10 are fixed at regular intervals to the base 11, and pin bases for inserting the dot pins 1 corresponding to the respective dot pins 1 are fixed to the base 11. 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 pierced in the base 11, the dot pins
Beveled to make it easier to insert. FIG.
(B) is a diagram showing the printing module after assembly, and as shown in the drawing, a set of coil bases 2 is a permanent magnet 10.
The dot pins 1 placed between the coil bases 2 and soldered to the respective coil bases 2 are inserted into the respective pin intermediate guides 8 and the pin guides 9, and the stoppers 12 serve as back stoppers of the coil bases 2 when printing is not performed. 4
It is installed so that it may be pressed lightly.

In FIG. 1, one of the coil bases 2 to which a set of dot pins 1 on the left end is brazed shows a printing state, and the dot pins 1 hit a sheet from a pin guide 9 via a ribbon. Is jumping out for.

When the dot pin 1 is inserted into the pin intermediate 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 interval between the back stoppers 4 is increased.

In the present invention, the side surfaces of the coil base 2 and the dot pins 1 are brazed to the coil base 2 forming a set so as not to be horizontal. However, only one of the coil bases 2 forming the set is brazed. The dot pins 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 interval between the coil bases 2.

Further, the coil bases 2 forming a pair are arranged so that the side surfaces thereof are parallel to each other, and the dot pins 1 are brazed to the coil bases 2 so as not to be horizontal to the side surfaces of the coil bases 2. Dot pin 1 not on the side
Is attached to the coil base 2 so that the interval between the ends of the dots is wider than the interval between the coil bases 2, and the dot pin 1 is inserted into the pin intermediate guide 8 and the pin guide 9,
The dot pins 1 are made parallel to each other so that the interval between the back stoppers 4 of the coil base 2 is widened. Even if the pins 1 are kept parallel to each other, they are soldered to the coil base 2, the coil base 2 is fixed so as to be oblique to the base 11, and the dot pins 1 are inserted into the pin intermediate guides 8 and 9. 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 to reduce the damage of the parts accompanying the printing operation. This greatly contributes to improving the reliability of the dot printer and prolonging its life.

[Brief description of the drawings]

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

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

3A and 3B are views showing a conventional example, in which FIG. 3A is a side view showing a print module before assembly, and FIG.
FIG. 4 is a diagram illustrating a print module after assembly.

[Explanation of symbols]

 REFERENCE SIGNS LIST 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 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-59-21007 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B41J 2/29 B41J 2/26

Claims (1)

(57) [Claims] 1. A printing module having a structure in which two coil bases to which dot pins (1) for embossing a sheet are connected through pin guides (8, 9) are movably arranged side by side as a set of two coil bases. One of the dot pins (1) is connected to the side surface of the coil base (2) at an angle from a horizontal surface so that the interval between the upper ends of the coil bases in the moving direction of the dot pins is wider than the interval between the dot pins forming a group. A wire dot printer comprising an assembled printing module.