JPH0776111A - Magnet print head unit - Google Patents

Abstract

(57) [Abstract] [Purpose] With regard to an impact line printer device, particularly regarding improvement of the structure of the print head unit, stress is concentrated easily and easily on the joint between the beam and the armature of the print head unit of the impact line printer device. An object of the present invention is to provide a magnet print head unit including a print head unit capable of preventing the occurrence of the above. [Structure] A leaf spring 1 and an armature 2 are connected, an armature 2 and a beam 3 are connected, and a pin 4 is connected to the beam 3, and the pin 4 is connected via an ink ribbon 9 and a printing paper 10 to a platen. In a magnet print head unit having a print head portion that collides with the printing paper 10 to print on the printing paper 10, the joint portion between the armature 2 and the beam 3 is continuously and sequentially directed from the armature 2 toward the beam 3. It is configured to have a reduced cross-sectional shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact line printer, and more particularly to improvement of the structure of a print head section.

In an impact line printer, printing is performed on a sheet of paper by an impact force that causes a pin of a print head portion to collide with a platen, and a beam to which this pin is coupled is further coupled to an amateur. Since the amateur prints by the repulsive force of the leaf springs joined by welding, this impact force is transmitted to the beam via the pin, and the hardness of the material at the joint between the beam and the amateur changes suddenly, Due to the abrupt change of the shape of the joint between the beam and the armature, the stress changes abruptly, resulting in a failure of cutting the joint between the beam and the armature.

Under the circumstances as described above, the magnet print head unit having the print head portion capable of preventing the stress caused by the impact force of the pin colliding with the platen from abruptly changing at the joint between the beam and the armature. Is required.

[0004]

2. Description of the Related Art A print head portion of a conventional impact line printer will be described in detail with reference to FIGS.

4 to 5 are views for explaining the structure and operation of the print head portion of a conventional impact line printer. As shown in FIGS. 4 (a) and 5 (a), the leaf spring 11 and the yoke 16 are fixed via the permanent magnet 18, and the coil 17 is provided so as to surround the other end of the yoke 16. There is.

An armature 12 facing the other end of a yoke 16 surrounded by a coil 17 is welded to the leaf spring 11, and a groove portion formed in the armature 12 has a shape shown in FIG.
The beam 13 is inserted and fixed as shown in FIG. 4 (b).

A pin 14 is fixed to the other end of the beam 13 by welding. When no current is applied to the coil 17, the armature 12 is fixed as shown in FIGS. 4 (a) and 4 (c). The leaf spring 11 is bent by being attracted to the yoke 16, and the pin 14 and the platen 15 are separated from each other.

The printing paper 10 and the ink ribbon 9 are in contact with the platen 15 as shown in FIG. 5 (a). When a current is applied to the coil 17, as shown in FIGS. 5 (a) and 5 (b). The armature 12 is separated from the yoke 16 and the leaf spring 11 is flattened, and the pin 14 collides with the platen 15 through the beam 13 and the ink ribbon 9 and the printing paper 10 by the restoring force. Printing on 10.

[0009]

In the print head portion of the conventional impact line printer apparatus described above, printing is performed by the impact force of the pin colliding with the platen due to the restoring force of flattening the leaf spring. This impact force is transmitted to the beam via the pin, and the stress changes rapidly due to a sudden change in the hardness of the material at the beam-amateur joint and a sudden change in the shape of the beam-amateur joint. However, there is a problem that the joint between the beam and the amateur is cut off.

In view of the above situation, the present invention can easily and easily prevent a sudden change in stress at the joint between the beam and the armature of the impact line printer apparatus. The present invention is intended to provide a magnetic print head unit including the.

[0011]

In a magnetic print head unit of the present invention, a leaf spring and an armature are combined, the armature and the beam are connected, and a pin is connected to the beam. In a magnet print head unit having a print head unit that prints on a printing paper by colliding with a platen through the printing paper, the joint portion of this amateur and this beam is successively and sequentially directed from this amateur toward this beam. It is configured to have a reduced cross-sectional shape.

[0012]

Operation: The leaf spring and the armature are connected, the armature and the beam are connected, and the pin is connected to this beam. The pin is collided with the platen via the ink ribbon and the printing paper to print on the printing paper. In the magnetic print head unit to be performed, in the present invention, the joint portion between the amateur and the beam is configured to have a cross-sectional shape that is successively and successively reduced from the amateur toward the beam, and therefore occurs at the time of printing. Since it is possible to prevent the stress caused by the impact force from changing abruptly at this joint, it is possible to prevent the beam from being cut at the joint between this beam and the armature.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2, and a second embodiment of the present invention will be described in detail with reference to FIG.

1 and 2 are views for explaining the structure and operation of the print head portion of the impact line printer apparatus of the first embodiment of the present invention, and FIG. 3 is the impact line printer of the second embodiment of the present invention. It is a figure which shows the structure of the beam of the print head part of an apparatus, and the joining part of an amateur.

In the first embodiment of the present invention, the leaf spring 1 and the yoke 6 are fixed via a permanent magnet 8 as shown in FIGS. 1 (a) and 2 (a). A coil 7 is provided so as to surround the other end of the coil.

An armature 2 facing the other end of a yoke 6 surrounded by a coil 7 is welded to the leaf spring 1, and a groove portion provided in the armature 2 is illustrated in FIG.
As shown in 1 (b), spring steel with a thickness of 0.2 mm and a height of 3 mm (M
A beam 3 made of ASI) is inserted and fixed.

A pin 4 is fixed to the other end of the beam 3 by welding, and when the coil 7 is not energized, the armature 2 is fixed as shown in FIGS. 1 (a) and 1 (c). The leaf spring 1 is bent by being attracted to the yoke 6, and the pin 4 and the platen 5 are separated.

The printing paper 10 and the ink ribbon 9 are in contact with the platen 5 as shown in FIG. 2 (a). When a current is applied to the coil 7, the armature 2 separates from the yoke 6 and the leaf spring 1
The restoring force for flattening is transmitted to the pin 4 via the beam 3, and the pin 4 collides with the platen 5 via the ink ribbon 9 and the printing paper 10 to print on the printing paper 10 by this impact force. There is.

As shown in FIG. 1 (b), the joint portion between the armature 2 and the beam 3 has a width gradually decreasing at its tip so that the width of the armature 2 does not change rapidly. Since the second moment gradually decreases in proportion to the width, the stress generated at the joint between the beam 3 and the armature 2 gradually increases, and the beam becomes as in the conventional case shown in FIG.
It is possible to prevent the stress generated in this portion from changing abruptly due to the rapid decrease in width of the armature 13 and the amateur 12.

In the print head portion of the impact line printer apparatus according to the second embodiment of the present invention, the side surface of the tip end portion of the armature 22 is circular as shown in FIG. The beam 3 and the amateur 22 will decrease in proportion to the cube of the height of the amateur 22.
To prevent the stress generated in this part from suddenly decreasing due to the sharp decrease in the width of the beam 13 and the armature 12 as in the conventional case shown in FIG. Is possible.

As described above, the beam 3 and the amateur 2 are caused by the impact force generated by the collision of the pin 4 with the platen 5.
Since it is possible to prevent a sudden change in the stress generated at the joint portion of the beam, it is possible to prevent an obstacle at which the beam 3 is cut at the joint portion with the armature 2, as compared with a conventional impact line printer device. It has become possible to improve the beam life of the print head by about 10 times.

[0022]

As is apparent from the above description, according to the present invention, it is possible to prevent the stress from abruptly changing at the joint between the beam and the armature and to break the joint due to the extremely simple structure change. Therefore, it is possible to provide an impact line printer device in which the effect of significantly improving reliability can be expected.

[Brief description of drawings]

FIG. 1 is a diagram (1) illustrating the structure and operation of a print head portion of an impact line printer device according to a first embodiment of the present invention.

FIG. 2 is a diagram (2) illustrating the structure and operation of the print head portion of the impact line printer device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a structure of a beam / amateur joint portion of a print head portion of an impact line printer device according to a second embodiment of the present invention.

FIG. 4 is a diagram (1) illustrating the structure and operation of a print head unit of a conventional impact line printer device.

FIG. 5 is a diagram (2) illustrating the structure and operation of a print head unit of a conventional impact line printer device.

[Explanation of symbols]

 1 leaf spring 2,22 armature 3 beam 4 pin 5 platen 6 yoke 7 coil 8 permanent magnet 9 ink ribbon 10 printing paper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hisashi Komabayashi 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Tomoya Miho, 1015, Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited

Claims (3)

[Claims] 1. A leaf spring (1) and an armature (2) are connected,
The amateur (2) and the beam (3) are combined, and the beam (3)
A print head that has a pin (4) connected to it and prints on the printing paper (10) by colliding the pin (4) with the platen (5) through the ink ribbon (9) and the printing paper (10). In a magnet print head unit having a section, the joint between the armature (2) and the beam (3) has a cross-sectional shape that is successively and successively reduced from the armature (2) toward the beam (3). A magnetic print head unit characterized by the above. 2. The magnet according to claim 1, wherein a width of a joint portion between the armature (2) and the beam (3) is reduced in a cone shape from the armature (2) toward the beam (3). Print head unit. 3. The magnet print head unit according to claim 1, wherein an end portion of a joint portion between the armature (2) and the beam (3) has a semi-cylindrical shape whose axis is in a width direction.