JPS6211654A - Wire dot head - Google Patents

Abstract

PURPOSE:To lower noise and to prevent the irregularity in recording density, by forming a stopper from an elastic member and finishing the contact surface of the stopper with an armature by polishing. CONSTITUTION:A stopper 15 is formed of fluorocarbon rubber and a stopper holder 16 is formed of zinc and both of them are integrated by baking. If the stopper 15 is formed of the fluorocarbon rubber, the stopper 15 is low in impact resilience and enhanced in abrasion resistance and heat resistance because of the member stopping an armature 14. Because the stopper holder 16 is formed of zinc excellent in impact absorbability, said holder 16 can effectively absorb the impact from the stopper 15. Because the stopper 15 and the stopper holder 16 are integrated before finished by polishing the surfaces thereof contacted with the armature 14, the irregularity in the displacement of each wire 22 is perfectly eliminated and the irregularity in recording density is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wire dot, and more particularly to a wire dot head equipped with a large number of wires.

[Prior Art] In order to print characters, etc. using dots, as shown in Fig. 2, an mXn dot matrix configuration is used, and n wires are arranged horizontally at a pitch of Pl and vertically at a pitch of P2. If the wire is moved and shifted m times and the wire is driven for each shift, the desired printing can be performed.

The conventional structure of a wire dot head for performing such dot printing is shown in FIGS. 3 to 6.

In FIGS. 3 to 6, the reference numeral 1 denotes a tip guide, which is fixed to the intermediate guide 2. As shown in FIGS.

The intermediate guide 2 is formed with a notch 2a for a screw to be attached to a carriage (not shown).

A flexible printed circuit board 3 that is integrated with a heat dissipation plate 4 is arranged behind the intermediate guide 2.

The heat dissipation plate 4 also serves as a spacer between the flexible printed circuit board 3 and the yoke 5 formed in the shape of an elliptical cylinder, and transmits the heat of the yoke 5 to a back holder, which will be described later.
A thermally conductive crushed material such as aluminum with a thickness of about 2 fl 1 m is selected.

A plurality of cores 6 are fitted and fixed to the yoke 5, and a pobin 8 around which a coil 7 is wound is attached to the core 6.

Two terminals 8a are protruded from the pobbin 8, and the winding start and winding end portions of the coil 7 are fixed to these by soldering. The terminal 8a is connected to the yoke 5. The solder is fixed to the flexible printed circuit board 3 side through the heat dissipation plate 4.

On the other hand, the reference numeral 9 denotes a rear guide, which is formed into a cylindrical shape as a whole, and is connected to the yoke 5° heat dissipation plate 4.
．． The intermediate guide 2 passes through the flexible printed circuit board 3.
It is placed in a self-contained state.

One end of a return spring 10 is fixed to the rear end of this rear guide 9. On the other hand, the open end of the rear end of the yoke 5 is closed by an auxiliary yoke 11. A circular opening is formed in the center of the auxiliary yoke 11, and the rear end of the rear guide 9 corresponds to this opening.

In addition, a post 8b protruding from the rear end side of the pobbin 8 is fitted into a through hole formed in the auxiliary yoke 11 and protrudes rearward. are fitted.

The number of armatures 14 is the same as the number of wires 22, and a plunger 13 is provided in the middle thereof.

Further, a spacer 12 is arranged between the auxiliary yoke 11 and the armature 14.

The spacer 12 of C is the auxiliary yoke 11 and the armature 14.
This is provided to prevent the movement of the armature 14 from becoming unstable due to wear caused by contact with the auxiliary yoke 11 or residual magnetism of the auxiliary yoke 11, which may cause problems when forming a closed magnetic path.

As shown in FIG. 6, a plurality of armatures 14 are arranged radially, and the proximal end of the wire 22 is fixed to the distal end thereof. The return spring 1O is loaded between the free end of the armature 14 and the rear end of the rear guide 9, and this return spring 10 keeps the free end of the armature 14 always behind the rear guide 9. A force is applied in the direction away from the edge.

On the other hand, a stopper 15 is arranged behind the armature 14 and faces a position where it can come into contact with the free end side of the armature 14. This stopper 15 is fitted into a stopper holder 16, and the tip of the radially formed armature presser spring 17 is in a state in which the base end side of the armature 14 is pressed against the auxiliary yoke 11. ing.

By the way, a damper 18 is arranged behind the armature presser spring 17. This damper 18 is made of a material with high specific gravity such as lead, and the washer 19. z<It is arranged in contact with the back holder 21 via the washer 20.

Note that the back holder 21 has a large effect on the heat dissipation of the head, so the surface area of the back holder 21 should be made as large as possible.
As shown in FIG. 4, a large number of fins are formed on the outside.

This back holder 21 has screws 23 attached to the intermediate guide 2.
It is fixed in place and covers the armature and yoke as a whole.

Further, the washer 19 prevents the spring washer 20 from biting into the damper 18.

In addition, the wire 22 is attached to each guide 1, 2.9 to prevent buckling.
The plurality of wires 22 are guided along these guides so as to be gradually arranged in a vertical line, and are completely arranged in a vertical line within the tip guide l.

In order to print based on such a structure, when the coil 7 is energized according to the printing command, the yoke 5. Auxiliary yoke 11. Plunger 13. Since a closed magnetic path is formed by the core 6, the plunger 13 is attracted toward the core 6, and the armature 14 resists the elastic force of the return spring 10 to cause the wire 22 to protrude a predetermined distance from the tip guide 1.

The wire 22 prints dots on the paper via an ink ribbon (not shown).

[Problem to be Solved by the Invention J] By the way, in the above-mentioned wire dots, attempts were made to reduce the noise by using dampers 18, etc.
It was not very effective because it was incomplete.

In addition, the stopper 15 and the stopper holder 16 were integrally bonded with adhesive, but due to unevenness in the thickness of this adhesive layer, the end surface of the
Since the position of 5a varies, the amount of movable displacement of each armature 5 changes, and the behavior of the wire 22 fixed to one end of the armature 14 also changes for each wire, resulting in uneven shading in the recorded dots. This has caused a problem in that the recording quality is significantly degraded.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention has a plurality of armatures each having a base end of a wire fixed to one end thereof, and these armatures are connected to an electromagnet. A stopper is formed from an elastic member on the wire dot head that performs selective suction through the wire dot head to record dots and receives the suction return of the armature, and a supporting member of this stopper is formed from a shock-absorbing metal. An integrated structure was adopted.

[Function] When the above-described structure is adopted, the s)-/pa and the stopper holder (supporting member) work together to absorb the kinetic energy of the armature, making it possible to record with low noise and high quality. .

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 1 explains one embodiment of the present invention, and in each figure,
The same parts as in FIGS. 3 to 6 are denoted by the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, the stopper 15 is made of fluororubber, and the stopper holder 16 is made of zinc, and both are integrated by baking.

When the stopper 15 is formed from fluororubber, the stopper 1
Since 5 is a member that stops the armature 14, it is possible to effectively utilize the characteristics of having low impact resilience and excellent wear resistance and heat resistance.

In addition, the stopper holder 16 is made of zinc, which has excellent shock absorption properties.
can effectively absorb the impact from the stopper 15.

On the other hand, after the stopper 15 and the stopper holder are integrated, the surface 15a in contact with the armature 14 is polished, so there is no variation in the displacement of each wire 22, there is no uneven recording density, and the recording quality is greatly improved. do.

As described above, this embodiment employs a structure in which the stopper 15 made of an elastic member and the stopper holder 16 made of a shock-absorbing metal are integrated, so that the kinetic energy of the armature is transferred to the stopper 15. A part of the noise is absorbed by the particles, and a part of the noise is propagated to the stopper holder 16, where it is absorbed by the vibration of the particles such as zinc that constitute the stopper holder, and is converted into thermal energy, thereby preventing the generation of noise.

In addition to the above-mentioned zinc, the shock-absorbing metal that makes up the stopper holder is aluminum.

Lead or zinc alloy may also be used.

[Effect] As is clear from the above description, according to the present invention, a structure is adopted in which the stopper is formed from an elastic member, the stopper holder is formed from a shock-absorbing metal, and the two are integrated by baking. Therefore, a wire dot head with low recording noise can be obtained.

Further, since the contact surface of the stopper with the armature is polished, there is no variation in the displacement of the wire, and high-quality recording can be performed without variation in recording density.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional side view of a wire dot head illustrating an embodiment of the present invention, FIGS. 2 to 6 are illustrations of a conventional structure, FIG. 2 is an explanatory diagram of a dot matrix, and FIG. 4 is an exploded perspective view of the wire dot head, FIG. 5 is a view taken along the line A-A in FIG. 3, and FIG. 6 is a view taken along the line B-B in FIG. 3. This is a perspective view. 5... Yoke 6... Core 7... Coil pobbin 14... Armature 15... Stopper 16... Stopper holder 22... Wire

Claims (1)

[Claims] 1) A wire dot head that has a plurality of armatures each having a base end of a wire fixed to one end, and that selectively attracts these armatures via an electromagnet to record dots. A wire dot head characterized in that a stopper for receiving suction return of an armature is formed from an elastic member, and a support member for this stopper is formed from a shock-absorbing metal, and the two are integrated. 2) The wire dot head according to claim 1, wherein the stopper and the stopper support member are integrated by baking.