JPH0410949A - Wire dot head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wire dot head, which is a printing mechanism of a wire dot printer used in a printer for computer peripheral terminals.

[Prior Art] In the prior art, a spring holder used for positioning a coil spring was made of plastic, and the seat of the coil spring was also formed integrally.

[Problem to be solved by the invention]

In the conventional structure, a spring holder integrally molded from plastic has been used to position and hold the coil spring. At this time, it is essential to use a coil spring with a large spring constant for a wire dot head with high output and high copying ability, and the specifications of the wire dot head include:
When printing using the surging frequency of a coil spring, which is frequently used, the behavior of the coil spring becomes unstable, and the coil spring bounces at the seat of the coil spring in the spring holder, causing the impact force to become unstable. Repeatedly, the seat of the coil spring of the spring holder will wear out and become deformed. As a result, the holding force of the fill spring will decrease, and the wire will remain protruding, making it impossible to print or There were problems in that the behavior of the ribbon became unstable, the printing ability decreased, and the ribbon caught.

The present invention has been made to solve the above problems, and provides a wire dot head that is excellent in greatly improving printing life, reducing changes in printing ability over time, and improving durability and reliability. The purpose is to obtain.

[Means for solving the problem] A wire dot in which the wire behaves as an electromagnetic coil attracts a lever to which a wire is integrally connected toward the core, the wire pops out, and a coil spring causes the lever to return toward the damper. A wire dot head characterized in that the head is provided with a metal spacer having a hardness of HV180 or more on the seat of the coil spring.

[Function] By providing a metal spacer on the seat of the coil spring, when printing at the surging frequency of the coil spring, even if the coil spring jumps up on the seat and applies an impact force to the seat, the metal spacer absorbs it and the impact force is applied to the seat. Only slight wear occurs and no deformation occurs at all. Therefore, the holding force of the coil spring can always be kept constant even if the number of printing increases.

[Embodiment] Fig. 1 is a sectional view of the first embodiment of the present invention, and Fig. 2 is a plan view of the main components. has been done.

The coil spring 2 is positioned in a spring holder 3, one end is in contact with a lever 4, and the other end is in contact with a metal sweeper. The outer periphery of the metal spacer 1 is positioned by a spring holder 3, and the metal spacer 1 is held against the nose guide 5. An electromagnetic coil 8 is provided around the core 7, and the lever 4 integrally connected to the wire 9 has a fulcrum shaft 11 held by a fulcrum yoke plate A12, a yoke plate B13, and a fulcrum spacer 14.

Next, the present invention configured as described above will be explained in detail. The electromagnetic coil 8 is energized by the printing signal, the lever 4 is attracted toward the core 7, and the wire 9 integrally connected to the lever 4 is attached to the printing paper 17 whose back side is held by the platen 16 via the ribbon 15. Printing is performed by collision.

By the way, in this embodiment, the outer periphery of the metal spacer 1 is positioned by the spring holder 3, the metal spacer 1 is brought into contact with the nose guide 5, held, and provided on the seat of the coil spring 2, so that printing can be performed at the surging frequency of the coil spring 2. Thus, even if the coil spring 2 springs up on a part of the metal spacer and applies an impact force, only slight wear occurs and deformation etc. can be prevented.

In the first embodiment, the same effect can be obtained even if the method of positioning and holding the metal spacer is changed, or even if it is fixed to a spring holder or the like by adhesion, heat fusion, etc.

FIG. 3 is a sectional view of a second embodiment of the present invention, and FIG. 4 is a plan view of the main components thereof. On one side, the spacer 18 is formed in a cylindrical shape.

The metal spacer 18 is held at the bottom of a hole in the spring holder 19 that positions and holds the coil spring 2, and the outer diameter of the metal spacer 18 is positioned at the aforementioned hole diameter. The other constituent parts and the operation of the present invention are the same as in the first embodiment.

By the way, in the second embodiment, the same effect as in the first embodiment can be obtained by changing the shape of the coil spring seat of the conventional spring holder only in the i dimension direction and adding a metal spacer 18. .

In addition, metal spacers can be made by press processing, laser processing,
The same effect can be obtained even if manufacturing is performed by machining, wire electric discharge machining, or the like.

Furthermore, if the material and properties such as hardness of the metal spacer are optimally selected and set according to the material of the coil spring and the specifications and performance of the wire dot head, the same effect can be obtained in all cases. However, the hardness of the metal spacer is HV18.
If it is less than 0, approximately 0.1ff is printed for 1 x 10” times.
i″′ is worn out and printing becomes impossible.

Although this embodiment uses a direct suction non-ballistic type wire dot head, the same effect can be obtained with any wire dot head using a coil spring, such as a direct suction type ballistic type or a piezoelectric element drive type.

[Effects of the Invention] As is clear from the above description, the present invention provides a metal spacer on the seat of the coil spring, so that even if the coil spring applies an impact force to the seat, minimal wear is suppressed and the seat It is possible to prevent deformation, etc., significantly improve printing life, reduce changes in printing ability over time, and ensure improved durability and reliability and high printing quality.

[Brief explanation of drawings]

1 and 2 are sectional views of a first embodiment of the present invention, respectively. 3 and 4 are sectional views of a second embodiment of the present invention, respectively. FIG. 5 is a sectional view of the prior art. l ・ 2 ・ 3 ・ 4 ・ 5 ・ 7 ・ 8 ・ 9 ・ l 1 ・ 12 ・ 13 ・ 14 ・ 15 ・ 16 ・ 17 ・ 18 ・ 19 ・ 20 ・ Metal spacer coil spring spring holder lever nose guide core electromagnetic coil wire fulcrum Shaft Yoke Plate A Yoke Plate B Fulcrum Spacer Ribbon Platen Printing Paper Metal Spacer Spring Holder Damper Figure 1 Figure 4

Claims (1)

[Claims] An electromagnetic coil attracts a lever to which a wire is integrally connected toward the core, and the wire pops out.The coil spring causes the lever to return toward the damper, causing the wire to behave.In the wire dot head, hardness is applied to the seat of the coil spring. A wire dot head characterized by being provided with a metal spacer with an HV of 180 or more.