JPH03132361A - Impact dot head - Google Patents

Abstract

PURPOSE:To make fixing of positioning easy by forcibly fitting a tip guide and a guide support component by a method wherein projections are provided to the tip guide, the guide support component, and an outer casing component in the impact dot head of a printer. CONSTITUTION:A plurality of grooves to a guide holder 15, and a tip guide 14 and an intermediate guide 11 are inserted thereinto to be positioned fixedly. The tip guide 14 has a different surface in level, and the guide holder 15 has a form along a difference in level shape. Projections 15a, 15b are provided to a groove part to be engaged with the tip guide 14, and the tip guide 14 is inserted into the groove to be fixed. A projection 15d is provided to a bottom surface of the guide holder, and a projection 15e is provided to side surface. By forcibly fitting the guide holder 15 into a nose after forcibly fitting the tip guide, the guide 14 can be easily positioned by fixing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an impact dot head for an impact printer.

[Prior Art 1] Conventionally, in such an impact dot head, the tip guide has been fixed by adhesive.

1 Issue B that the invention seeks to solve] However, in such a configuration, the tip guide is positioned and the adhesive is applied, making assembly difficult, and the amount of adhesive applied is not constant, resulting in variations in adhesive strength. This caused a decrease in reliability. In addition, when ink adheres to the adhesive part while the printer is in use, the adhesive swells and the adhesive strength decreases, leading to misalignment of the tip guide, resulting in poor printing quality and damage to the printing wire. There was a problem.

The present invention has been made to solve the above-mentioned problems, and provides an impact dot head with excellent ease of assembly and fixation of the tip guide.

(Means for Solving the Problems 1) The present invention provides a protrusion on one or both of the distal guide and the guide holding member at the engagement portion between the distal guide and the guide holding member, and further provides an engagement portion between the guide holding member and the exterior member. It is characterized in that a protrusion is provided on one or both of the guide holding member and the exterior member at the joint portion.

[Function 1] In the impact dot head configured as above,
The tip guide is press-fitted and fixed to the guide holding member, and the guide holding member is press-fitted and fixed to the exterior member, so that positioning and fixing can be easily performed. Furthermore, since the tip guide is mechanically fixed, stable fixing force can be obtained over a long period of time.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view of an impact dot head showing an embodiment of the present invention. A printing wire 1 made of high speed steel or carbide is fixed to the tip of the armature 2 by silver brazing. A plurality of circular holes 2a are provided near the printing wire 1 of the armature 2 in order to reduce the weight of the armature 2. The printing wire 1 has a plurality of intermediate guides 11
Guidance is maintained by. The tip of the printing wire l is.

It is held by a tip guide 14 made of zirconia ceramics with excellent wear resistance. The material of the tip guide 14 may be alumina ceramics, titania ceramics, etc. The tip guide 14 and the intermediate guide 11 are positioned and fixed by a guide holder 15. Second
The figure shows an exploded view of the distal guide 14, the intermediate guide 11, and the guide holder 15, showing the engagement state of the guide holder 1.
5 is provided with a plurality of grooves, and a tip guide 14 is provided in the line groove.
The intermediate guide 11 is inserted, positioned and fixed.

The tip guide 14 has a stepped surface 14c, and the guide holder 15 is also shaped to follow the stepped shape of the tip guide 14. FIG. 3 shows a top view of the guide holder 15. The groove that engages with the tip guide 14 has protrusions 15a,
b is provided, and the tip guide 14 is attached to the guide holder 15.
When fully inserted, the protrusion 15a will touch the surface 14 of the tip guide 14.
b is pressed and fixed to the surface 15d of the guide holder 15, and the protrusion 15b presses and fixes the surface 14c of the tip guide 14 to the guide holder 1.
It is pressed and fixed to the surface 15c of No.5. The intermediate guide 11 is inserted into the groove of the guide holder 15 with some play. Fourth
The figure shows a front view of the guide holder 15. A projection 15d is provided on the bottom surface of the guide holder 15, and a projection 15e is provided on the side surface. ing. When the guide holder 15 is inserted into the nose 16 in this state, the projection 15d is deformed by the lower surface 16b of the nose 16 shown in FIG.
The guide holder 15 is pressed against the right surface of the nose 16 to determine its position in the vertical direction, and the projection 15e is deformed in the left-right direction by the left surface of the nose 16 (not shown). In this manner, after the tip guide 14 is press-fitted into the guide holder 15, the tip guide 14 can be easily positioned and fixed by press-fitting the guide holder 15 into the nozzle I6.

The detailed description of the invention continues with reference to FIG. Amadeur 2
A leaf spring 7 is fixed to the other end by means such as welding, and the leaf spring 7 is held between a spring holding plate 8 and a side yoke 6. FIG. 5 shows the positional relationship between the side yoke 6 and the armature 2. The armature 2 has an irregular cross-sectional shape that is thin on the side where the printing wire 1 is fixed and thick at the part where it is fixed to the leaf spring 7. There is. The side yoke 6 has a shape that follows the outer shape of the armature 2 with a gap of about 0.05 to 0.3 mm from the outer circumference of the armature 2. In FIG. 1, below the armature 2 is a core portion 3 of a base core 3 made of silicon steel or iron-cobalt alloy.
a are opposed to each other, and a coil lO is wound around the core portion 3a to constitute an electromagnet.

Next, the operation will be explained with reference to FIG. In the standby state, m bundles generated from the permanent Ni stone 4 pass through the yoke plate 5, the side yoke 6, the armature 2, and the pace core 3, so the armature 2 bends the leaf spring 7 and passes through the base core 3.
The zero-order coil l is suctioned and held on the end face of the core part 3a.
When a current is passed through O in a direction that cancels the magnetic flux of permanent magnet 4,
The armature 2 is released from the attractive force of the permanent magnet 4,
The strain energy accumulated in the leaf spring 7 causes it to rotate in the direction of arrow B, and as a result, the printing wire 1 protrudes and collides with a printing medium (not shown) to form a dot. After the collision, the armature 2 is attracted and held by the core portion 3a of the base core 3 due to the repulsive force at the time of the collision and the attractive force of the permanent magnet 4, and one printing process is completed.

〔Effect of the invention〕

As described above, according to the present application, a protrusion is provided on one or both of the distal guide and the guide holding member at the engagement portion between the distal guide and the guide holding member, and the protrusion is provided at the engagement portion between the guide holding member and the exterior member. Since a protrusion is provided on one or both of the holding member and the exterior member, the tip guide is properly fixed to the guide holding member, and the guide holding member is properly fixed to the exterior member, making it easy to position the tip guide. It can be fixed. Furthermore, since the tip guide is mechanically fixed, stable fixing force can be obtained over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an impact dot head showing an embodiment of the present invention. FIG. 2 is an exploded view showing an engaged state of a distal guide, an intermediate guide, and a guide holder according to an embodiment of the present invention. FIG. 3 is a top view of a guide holder showing an embodiment of the present invention. FIG. 4 is a front view of a guide holder showing an embodiment of the present invention. FIG. 5 is a top view showing the positional relationship between a side yoke and an armature showing an embodiment of the present invention.・Print wire 2... Armature 3 ・ 4 ・ 5 ・ 6 ・ 8 ・ 9 ・ 10 ・ 11 ・ 12 ・ l 4 ・ l 5 ・ 6 ・ Base core ・ Permanent magnet ・ Yoke ・ Side yoke ・ Leaf spring ・Spring press board, nose, coil, wire guide, back cover, tip guide, guide holder, nose

Claims (1)

[Claims] In an impact dot head that includes a tip guide that supports a printing wire, a guide holding member that holds the tip guide, and an exterior member that engages with and surrounds the guide holding member, the tip guide A protrusion is provided on one or both of the distal end guide and the guide holding member at the engagement portion of the guide holding member, and the guide holding member is further provided at the engagement portion of the guide holding member and the exterior member. An impact dot head characterized in that a protrusion is provided on one or both of the exterior members.