JPS62292443A - Structure of wire dot printer head - Google Patents

Abstract

PURPOSE:To enable a high-speed printing at a low cost, by a method wherein a wire is provided on an armature support member so as to extend toward the shaft center of a coil and an armature is fixed to the wire. CONSTITUTION:When a coil 24 is free from conduction in non-printing condition, an armature 22 is attracted to a portion 29 of an end of a core with a wire 26 bent to be deformed on a plane parallel to the paper surface of the figure. In this condition, when conduction to the coil 24 is effected for a given time, the magnetic flux flows in a direction reverse to the magnetic flux due to a permanent magnet 23; therefore, the magnetic flux due to the permanent magnet 23 is partially set off. As a result, the attraction force of the armature 22 to the end portion 29 of the core is decreased, thus the restoring force due to the flexure stress of the wire 26 defeats the attraction force to release the armature 22. The armature 22 is energized due to the restoring force of the wire 26, thereby rocking clockwise in the figure to conduct printing with a printing wire 27.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Summary] The present invention aims to simplify the structure of a release type wire dot print head. This objective is achieved by adopting a structure in which the armature is fixed and supported by the armature, which is stretched so as to extend in the direction of the armature.

[Industrial application field]

The present invention relates to the structure of an open wire dot printhead.

In a release type wire dot print head, the armature is attracted to one end surface of the core by a magnetic flux formed through the armature support member, the armature, and the core by a permanent magnet, and the armature is attracted to one end surface of the core by a coil fitted to one end of the core. The armature is released by energizing it, and the swinging motion of the armature at this time causes printing to be performed using the wire attached to the tip of the armature. This type of wire dot printhead is suitable for high-speed printing and is widely used.

[Conventional technology]

The structure of the conventional open wire dot print head is
As shown in the figure, 1 is a U-shaped core, 2 is an armature, 3 is a permanent magnet, and 4 is a coil.

The armature 2 is swingably supported by an armature support member 5 via a cross spring mechanism consisting of a leaf spring 6 and a support wire 7, and is provided with a printing wire 8 at its tip.

The permanent magnet 3 is connected to the end 9 of the core 1 and the armature support member 5.
core 1. Amateur support member 5. Form a magnetic flux passing through armature 2 to connect armature 2 to core 1
It is adsorbed to the end portion 10 of.

The coil 4 is fitted onto the end 10 of the core l. A current is supplied to this coil 4 at a predetermined time, and as a result,
A magnetic flux in the opposite direction to the above magnetic flux is generated, a part of the above magnetic flux is canceled out, and the armature attraction force is reduced. As a result, the armature 2 is biased by the cross spring mechanism and swings clockwise in the figure, and this swinging action causes the printing wire 8 to print.

In such a conventional structure, a side magnetic path 11 is provided,
The tip portion 12 of the side magnetic path 11 sandwiches the vicinity of the attraction portion of the armature 2 from both sides. The reason why such a side magnetic path 11 is provided is that the leaf spring 6 alone is insufficient for forming the magnetic path between the armature support member 5 and the armature 2.
This is to compensate for this. By adding this side magnetic path 11, the magnetic flux flows as shown by the chain arrow line in the figure.

[Problem that the invention seeks to solve]

In this way, the conventional structure requires a ([1!l (if path), which increases the number of parts and increases costs.

c. Means for Solving Problems] The present invention provides a structure of a wire dot print head that can solve the above-mentioned problems. The armature is fixed to the wire that extends to the armature.

[Effect]

By employing the above configuration, the armature can be provided close to the armature support member, so the magnetic flux flows from the armature support member to the armature with a sufficient cross-sectional area without providing a side magnetic path like in the past. However, in this case it is desirable that the gap between the armature and the armature support member be as small as possible, which improves efficiency.

In addition, during non-printing when the coil is not energized, the armature is attracted to the end of the core with the wire bent and deformed, and when the coil is energized, the released armature is swayed by the restoring force of the wire. This causes the printing wire to print. That is, the wire is operated by the bending stress of the wire and the attraction force by the permanent magnet.

〔Example〕

The invention will now be described in detail with reference to FIG. 1st
The figure is a side view showing the structure of the wire dot print head according to the present invention. In the figure, 21 is a U-shaped core, 22 is an armature, 23 is a permanent magnet, and 24 is a coil.

The armature 22 is fixed to a wire 26 stretched in the left-right direction in the figure on the armature support member 25, and has a printing wire 27 at its tip.

With this configuration, the armature 22 can be provided much closer to the armature support member 25 than conventionally, and the side magnetic path 11 can be omitted.

The armature 22 is fixed to the wire 26 by, for example, making a hole in the armature 22 for passing the wire 26 through, fitting the wire 26 into the hole, and brazing the hole.

The permanent magnet 23 is provided between one end 28 of the core 21 and the armature support member 25 . A magnetic flux passing through the armature 22 is formed to attract the armature 22 to the end of the core 21.

The coil 24 has the same function as the conventional one, and is fitted into the other end 29 of the core 21.

The wire dot print head of the present invention has the above-described configuration, and since the conventional side magnetic path and leaf spring are omitted, the structure is simple and manufacturing costs are reduced.

Next, the operation of this wire dot print head will be explained.

During non-printing when the coil 24 is not energized, the armature 22 is attracted to the other end 29 of the core while the wire 26 is bent and deformed on a plane parallel to the plane of the drawing. When the coil 24 is energized for a predetermined period of time in this state, the resulting magnetic flux flows in the opposite direction to the magnetic flux caused by the permanent magnet 23, and a portion of the magnetic flux caused by the permanent magnet 23 is canceled out. As a result, the suction force of the armature 22 against the other end 29 of the core decreases, the restoring force due to the bending stress of the wire 26 overcomes this suction force, and the armature 22 is released. The printing wire 27 swings clockwise in the figure, and printing is performed using the printing wire 27. When the current supply to the coil 24 is stopped, the armature 22 returns to its original position where it attracts the other end 29 of the core. The operation of the armature 22 will be made smoother if one protrusion 30 of the armature support member 25 that fixes one end of the wire 26 is made elastic.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain a wire dot print head that has a simple structure, is low cost, and is suitable for high-speed printing.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the structure of a wire dot print head according to an embodiment of the present invention, and FIG. 2 is a side view showing the structure of a conventional wire dot print head. In the figure, 21 is a U-shaped core; 22 is an armature, 23 is a permanent magnet, 24 is a coil, 25 is an armature support member, 26 is a wire, 27 is a printing wire, 28 is one end of the core, and 29 is the other end of the core.

Claims (1)

[Claims] A U-shaped core, an armature support member, an armature elastically supported by the armature support member and provided with a printing wire, and between one end of the core and the armature support member. a permanent magnet that is provided at the other end of the core and forms a magnetic flux passing through the core, the armature support member, and the armature to attract the armature to the other end of the core; In the wire dot print head, the wire dot print head includes a coil that receives a supply of magnetic flux to form a magnetic flux in a direction opposite to the magnetic flux, releases the armature, and performs a printing operation, and the armature support member includes a wire extending in the axial direction of the coil. A structure of a wire dot print head, characterized in that the armature is fixed and supported by the wire.