JPS58217374A - Printing head - Google Patents

Abstract

PURPOSE:To provide a printing head, wherein the fixing end parts of a plurality of springs are molded as a unitary body, dispersion in a plurality of the springs is eliminated, the number of parts is few, and assembly work is easy, and by which stable printing quality is obtained. CONSTITUTION:The required number of divided springs 3 are arranged, and their fixing end parts are molded in a unitary body. Thus a plurality of springs are formed into the unitary body and a spring assembly 7 is formed. Before the molding, the size of the springs 3 is not restricted. A bending part for forming a rib piece 8 for obtaining specified rigidity can be obtained with sufficient allowance. Each spring 3 can be readily machined by a press. Accuracy in position and direction of each fixing point and each spring for determining the length of the spring is very high since the same die and zig are used. Dispersion in length, position, and direction of the springs is eliminated and the spring conditions are stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a print head of a printer device widely used as an input/output device in an information processing device.

First, we will explain the structure of a conventional print head.

FIG. 1 is an exploded perspective view of the main components of a conventional print head. The magnetic drive unit 1 has the same number of cores 2 as the number of wires (not shown), and a coil is wound around the outer periphery of each core.

The spring is divided into a plurality of 3-cell springs, and a wire is fixed to one end of each spring.

The upper and lower clamps 6m and 6b are inserted to set the spring 3 in a predetermined position when fixing the other end of the spring 3.1 The yoke 5 is a clamp that forms part of the magnetic circuit of the print head. It has the same number of holes as the number of cores of the magnetic drive unit 1.

Figure 4.5 is a cross-sectional view of one printed part of the assembled parts of Figure 1.

In Fig. 4.5, the armature 4 fixed to the middle part of the spring 3a is loosely fitted into the hole of the yoke 5 shown in Fig. 1, but this is omitted.

When the print head is in full operation, the armature 4 is attracted to and comes into contact with the core 2a against the biasing force of the spring 3a.

When printing, a current is applied to cancel the magnetism of the winding 9aK, and the spring 3a is released.
Operate the wire attached to the tip of the tooth (fang 4.5, omitted in the figure).

In this way, in the conventional print head of Kei, the spring ring, which is a movable part that repeats suction and release from the core, has a structure in which the springs are divided, for example, each spring 3as 3b as shown in Fig. 2.・・・・・・
... must be fixed to the yoke 5 with screws or welding A).As a result, if there are multiple springs, variations in dimensional accuracy such as the position and direction of the springs will increase, which will have a negative effect on printing quality. Extends.

In addition, when the spring 3 itself is integrated and high-density mounting is required such as with a round head, it is necessary to fix the lip piece 8 to increase the rigidity of the tip of the spring 3 as shown in Fig. 3. Therefore, the number of unnecessary steps increases, which not only leads to an increase in costs, but also has many technical difficulties.

Furthermore, in a print head of the type that prints using the strain energy of the spring 3, as shown in FIG. 4, it is effective for surface contact of the armature 4a with the core 2 in terms of collision vibration and wear. It's a hit or miss situation. On the other hand, when aiming for a surface collision as shown in Fig. 5, the spring 3a must be installed at an angle beforehand, and the left and right clamp members must also be machined at an angle, increasing the number of parts and making assembly difficult. There was a drawback.

The purpose of the present invention is to improve the dimensional accuracy of the fixed end position that determines the gap between the spring armature and core and the spring length, and to eliminate variations in multiple springs.
, Jin and K provide a print head that is easy to assemble and has fewer parts and can provide more stable print quality than conventional printers.

In order to achieve the above object, the print head according to the present invention includes a magnetic drive part comprising a plurality of cores around which windings are wound, and a Q RF24 in the middle part (with a print wire fixed to one end).
．． 5', consisting of a plurality of springs each having an armature fixed to the core of the crest, a yoke, and a clamp member; The other end is fixed to the magnetic drive unit via the clamp member, and the yoke is attached so as to surround each of the armatures, and the armature is attached to the core against the biasing force of the spring. In the print head that performs printing by attracting the windings and releasing the springs by applying a current that cancels magnetism to the windings, the clamp member is molded to accommodate the other ends of the plurality of springs, and the plurality of springs are The other end and the clamp member are integrally constructed.

According to the configuration, the object of the present invention is completely achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

Fig. 6 is a view showing an embodiment of the print head according to the present invention, and is a perspective view showing a spring assembly in which the fixed end of the spring is integrally molded, an off view is a sectional view of the spring assembly, and Fig. 8 is a perspective view showing a spring assembly in which the fixed end of the spring is integrally molded. 1 is an exploded perspective view showing a method of assembling a print head according to the present invention. FIG. The structure of FIG. 8 is the same as that of FIG. 1 except for the spring assembly 7.

As shown in FIG. 6, the spring assembly 7 is formed by integrating a plurality of springs 3 by arranging the necessary number of divided springs 3 and integrally molding the fixed ends.

Therefore, before integral molding, the springs 3 are not subject to any size restrictions, and the bending allowance for forming the lip piece 8 to obtain a predetermined rigidity can be secured with sufficient margin.Each spring 3 can be easily pressed by pressing. Can be processed.

In addition, the fixed end that determines the spring length, the position and direction of the springs are made using the same mold and tool, so dimensional accuracy is perfect, and the spring length between each spring 3,
Variations in position and direction are eliminated, and the spring conditions, which are the main factor in print quality, are stabilized.

On the other hand, as shown in the off-line diagram, by predetermining the angle of inclination 0 for the spring 3 with respect to the surface of the core 2a and integrally molding it as described above, the armature 4m and the core 2& will not cause surface collision. It can be expected to have a strong effect on collision vibration and wear protection. Further, as shown in FIG.
6b can be omitted and the number of parts can be reduced.

The spring assembly 7 includes upper and lower clamps 6 &, 6 bs in the conventional case shown in Fig. 1, and a plurality of springs 3 &, 3b, .
Since the fixed end of the spring is fixed, the number of screws for assembly can be reduced, and the dimensional accuracy of the molded part is improved, making assembly easier. It is easy to use and can be automated.

As explained in detail above, according to the present invention, the fixed ends of a plurality of springs are integrally molded, thereby stabilizing printing quality, extending life, reducing the number of parts, and simplifying assembly. This makes it possible to realize an inexpensive and reliable print head.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the print head assembly showing the prior art, Fig. 2 is a perspective view showing the fixing means when the spring is divided, and Fig. 3 is a perspective view showing that the spring itself is integrated. Figure 5 is a cross-sectional view of the print head in which the armature and core make one-sided contact, and Figure 5 is a cross-sectional view of the print head designed so that the armature and core collide face to face. Figure 1 and 6 are the original F! A perspective view showing one embodiment of the fixed end of the spring of a print head made by AK; the off view is a sectional view of the print head including a spring assembly in which the spring is tilted and the fixed end is integrally molded. The figure is an exploded perspective view of the print head according to the present invention. 1... Magnetic drive unit 2.2 fL, 21) ---, -ya 3.3
a, 3b... Spring 4a... Armature 5... Yoke 6a... Upper clamp 6
b-...Lower clamp 7...Spring assembly 8...
・Rib piece 9a... Winding patent applicant NEC Co., Ltd.'s representative patent attorney Jussu Inoro 6 prisoners 2 23 hits

Claims (1)

[Claims] a magnetic drive unit having a plurality of cores around which windings are wound; a plurality of springs having printing wires fixed to one end thereof and armatures corresponding to the plurality of cores respectively fixed to the middle part thereof; and a yoke. and a clamp member, the other ends of the plurality of springs are fixed to the magnetic drive unit via the clamp member so that each of the armatures creates a predetermined gap with respect to each of the cores, and attaching the yoke so as to surround the armature; causing the armature to be attracted to the core against the biasing force of the spring; and applying a current to the winding to cancel magnetism to release the spring. 1. A print head for performing printing, characterized in that the clamp member is molded to accommodate the other ends of the plurality of springs, so that the other ends of the plurality of springs and the clamp member are integrally constructed.