KR200151272Y1 - Impact-type dot matrix print head - Google Patents

Abstract

1. The technical field to which the invention described in the claims belongs.

The present invention relates to an impact dot matrix printhead.

2. The technical problem the invention is trying to solve.

The present invention provides the wire guide closest to the cap of the wire, and installs the wire guide both above and below the coil spring in order to solve the change due to the deformation and tolerance of the coil spring. In order to protect the compression coil spring by additionally installing a wire guide to provide a printhead with improved print quality.

3. Summary of the solution of the design.

The present invention is characterized in that a wire guide is installed between the wire guide and the armature to prevent the wear of the armature or foreign matter from penetrating the coil spring and to accurately pinch the cap of the wire and the armature.

4. Significant Uses of the Invention.

The present invention prevents the ingress of foreign matter into the coil spring generated during long-term use, minimizes the change of the coil spring, and installs additional wire guides to improve printing quality by precisely hitting the cap and armature. effective.

Description

Impact Dot Matrix Printhead

The present invention relates to an impact dot matrix print head, and more particularly, to a guide structure of a print wire.

Typically, the head of the print quality representation in the printer function is the head. Therefore, the printing quality depends on the head, and the impact dot matrix type head is widely used among these various heads.

As shown in FIG. 1, a dot matrix head according to a conventional embodiment includes a plurality of wire guides 22a, 22b, and 22c, a flat plate 10, and a yoke 12 extending upwardly at a right angle from the flat plate 10. It comprises a: yoke, an iron core 14 fixed upward from the flat plate 10, a cylindrical coil 16, an armature 18, a print wire 44, a return spring 20 and the like.

The cylindrical coil 14 is assembled to the iron core 14 assembled to the flat plate 10, and the armature 18 is fixed to the yoke 12 extended upwardly from the flat plate 10. The armature 18 uses an alloy of silicon (Si) and pure iron (Fe) as a material, and interlocks with and in contact with the cap 40 on the print wire 44, wherein the hardness of the cap 40 is It was so high that the armature 18 worn out over long periods of use.

The yoke 12 refers to a part which forms a body of the motor and at the same time forms a body of the motor. In addition, the armature 18 is one of the components constituting the magnetic circuit, and refers to a movable piece that converts magnetic energy into mechanical motion. The return spring 20 is seated at the end of the armature 18.

Print wires 44 are assembled to the plurality of wire guides 22a, 22b, and 22c, and the wire guides 22a, 22b, and 22c increase or decrease the quantity according to the length of the wire 44. The print wire 44 was silver welded after the cap 40 was press-fitted. As the material of the cap 40, SK4 (SK4) was used. In addition, the material of the print wire 44 used high speed steel or tungsten.

Looking at the effect according to the above configuration, when the power is applied to the cylindrical coil 16, a magnetic field is generated in the iron core 14 to pull the armature 18 front end toward the iron core 14, the rear end of the armature 18 The return spring (20) installed in the to create a bias state (BIAS: tilted to one side). The armature 18 pulled by the iron core 14 hits the cap 40 formed on the print wire 44 (life 200 million times), and the print wire 44 is moved by the applied blow to the wire guide 22a, 22b, 22c). At this time, the coil spring 26 assembled to the print wire 44 is pressed by the cap 40 to be in a biased state.

When the power applied to the cylindrical coil 16 is cut off in the above state, the magnetic field formed in the iron core 14 is lost, and the restoring force of the coil spring 26 assembled to the print wire 44 is in the biased state. In operation, the cap 40 of the print wire 44 is moved. With the movement of the cap 40, the front end of the print wire 44 and the armature 18 in contact with the cap 40 is returned to its original position. In addition, the armature 18 is also restored to its original position by the return spring 20 seated at the rear end of the armature 18.

However, as described above, since the coil spring is placed on the wire guide and the wire is pushed up by the length of the spring, when the wire is bent, the cap portion of the wire and the hitting part of the armature do not coincide. Therefore, it is difficult to apply an accurate shock.

Moreover, since the position of each wire differs according to the deformation and the length tolerance occurring in the manufacture of the coil spring, it is difficult to apply an accurate impact.

In addition, the coil spring is exposed between the armature hitting portion in the guide, the wear and foreign matter occurs in the long-term use is loaded on the spring, causing a problem that the spring can not be unloaded.

As a result, the print quality of the printer is degraded as a result.

The present invention has been made to solve the above-mentioned conventional problems, an object of the present invention is to provide a printhead provided with a wire guide closest to the cap of the wire to solve the mismatch between the cap of the wire and the hitting portion of the armature To provide.

Another object of the present invention is to provide a printhead with improved print quality by installing a wire guide both above and below the coil spring in order to solve the variation due to the deformation and tolerance of the coil spring.

Another object of the present invention is to expose the coil spring between the armature striking portion of the guide, and to further protect the compression coil spring by installing a wire guide to suppress the occurrence of abrasion and foreign substances generated in the long-term use To provide a printhead.

In order to achieve the above objects, the present invention is a shock dot matrix printhead composed of an armature, iron core, cylindrical coil, yoke, a plurality of wire guides, etc., to prevent wear and foreign matter from penetrating the coil spring of the armature At the same time, a wire guide is installed between the wire guide and the armature to precisely pinch the wire cap and the armature hit point.

1 is a cross-sectional view showing an impact dot matrix printhead according to a conventional embodiment

Figure 2 is a cross-sectional view showing an impact dot matrix print head according to an embodiment of the present invention

3 is a sectional view of main parts according to an embodiment of the present invention;

* Explanation of symbols on the main parts of the drawings *

1, 4: Wire Guide 2: Cap

2a: washer 3: compression coil spring

10: Reputation 12: York

14: iron core 16: cylindrical coil

18: Amateur 22a, 22b, 22c: Wire guide

44: Print wire

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. First, in adding reference numerals to the components of the respective drawings, the same components have the same reference numerals even though they are shown on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

As shown in Figures 2 and 3, the printhead according to an embodiment of the present invention is a plurality of wire guides (1, 4, 22a, 22b, 22c), the flat plate 10, the flat plate 10 upward Yoke 12 extended at right angles, iron core 14 firmly fixed to the plate 10, cylindrical coil 16, armature 18, print wire 44, return spring 20 and the like It consists of.

In detail, the cylindrical coil 16 is assembled to the iron core 14 fixed to the flat plate 10, and the armature 18 is the same as the conventional art in the yoke 12 extended upwardly from the flat plate 10. Seated in position. Print wires 44 are assembled to the wire guides 1, 4, 22a, 22b, and 22c, and coil springs 26 are installed to the print wires 44. The coil spring 3 is configured to be in contact with the front end of the armature 18.

At this time, the coil spring (3) between the wire guide (22a) and the armature (18) in order to prevent abrasion or foreign matter of the hitting portion of the armature (18) to penetrate the coil spring (3) due to long time use. In order to protect, additionally install the wire guide (1). In addition, the armature 18 drives the print wire 44 to the wire guide 1 so that the wire guide 4 supported by the compression coil spring 3 is pinched to accurately hit the cap 2. Install. That is, the wire guide 4 is supported by the compression coil spring 3 placed on the wire guide 22a.

In addition, the hook portion 4a is formed to restrain upward movement to the lower side of the wire guide 4 carried by the compression coil spring 3. The hook portion 4a is symmetrically extended downward. In addition, a washer (2a) is installed between the lower surface of the wire guide (4a) and the upper end of the compression coil spring (3) to minimize wear of the print wire (44). As a result, one side of the coil spring (3) is in contact with the washer (2a), the other side is in contact with the wire guide (22a), the space in which the coil spring (3) is installed is a somewhat sealed space, To prevent intrusion.

Looking at the action and effects according to the above configuration is as follows.

When power is applied to the cylindrical coil 16, a magnetic field is generated in the iron core 14 to pull the armature 18 toward the iron core 14. The armature 18 pulled by the iron core 14 strikes the coil spring 3 assembled to the print wire 44, and the print wire 44 moves in the wire guides 1 and 4 by the applied strike. Done.

On the contrary, when the power supply is cut off to the cylindrical coil 16, the magnetic field formed in the iron core 14 is lost, and the armature 18 returns to its original position by the movement of the print wire 44.

At this time, since the wire guides 1 and 4 are additionally installed as compared with the existing ones, even when the wires 44 are repeatedly collided, the initial positioning (hit point) is accurate. In addition, the coil spring is conventionally supported only at one place of the wire guide, and is supported at the upper and lower sides so that only a constant force in the vertical direction of the coil spring 3 acts to extend the life of the spring. Moreover, the wire guides 1 and 4 are supported by the washer 2a and supported by the coil springs 3, thereby keeping the hitting point constant at all times, even when the external environment changes. As a result, the striking points of the cap 2 and the armature 18 of the wire are always kept constant so that uniform print quality is maintained.

As discussed above, the present invention prevents the ingress of foreign substances into the coil spring generated during long-term use, minimizes the change of the coil spring, and additionally installs a wire guide, so that the impact point between the cap and the armature is accurate. It is effective in improving print quality. On the other hand, the detailed description of the present invention has been described with respect to specific embodiments, it is apparent to those skilled in the art that various modifications are possible without departing from the scope of the present invention.

Claims (4)

In the impact dot matrix printhead consisting of an armature, an iron core, a cylindrical coil, a yoke and a plurality of wire guides, It prevents the wear of the armature 18 or foreign matter from penetrating the coil spring 3 due to the impact of the cap 2 of the print wire 44 for a long time, and at the same time the impact of the cap 2 and the armature 18 An impact dot matrix printhead characterized in that a wire guide (1) is provided between the wire guide (22a) and the armature (18) to precisely point. 2. The wire guide of claim 1, wherein the armature 18 drives the print wire 44 to the wire guide 1 so that the hit point of the cap 2 is correct. Impact dot matrix printhead characterized in that (4) is installed. 3. The impact dot matrix printhead according to claim 2, wherein the Fuku portion (4a) is formed so as to restrain upward movement to the lower side of the wire guide (4) carried by the compression coil spring (3). The impact according to claim 1, wherein a washer (2a) is installed between the lower surface of the wire guide (4) and the upper end of the compression coil spring (3) to minimize wear of the print wire (44). Dot matrix printhead.