JPH0533146B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the structure of a wire dot head of a wire dot recording device.

[Prior art]

The wire dot recording device is configured to perform dot printing while causing a plurality of print wires to project from a plurality of excitation coils in accordance with a print pattern signal. Each printed wire is fixed to the tip of an armature, and is operated by attracting a given armature with an excitation coil.

As this type of recording device, one having the structure shown in FIG. 1 has been proposed. That is, in FIG. 1, an upper body 1 and a lower body 2 having an internal space are joined at their open ends, and a boss member 3 is disposed in a casing forming a closed space. A side yoke 4a is integrated. Further, the boss member 3 is fitted into the yoke 4. Furthermore, an electromagnet consisting of a core iron core 5 and an excitation coil 6 wound around the core iron core 5 is attached inside the yoke 4, and an armature 8 having a plunger 7 is attached to the lower side (rear side) of the side yoke 4a. is installed. This armature 8 and the plungers 7 fixed thereto are arranged radially corresponding to each of a plurality of (for example, 24) core iron cores 5. The magnetic flux path of the electromagnet is formed by the core core 5, yoke 4, side yoke 4a, and plunger 7, as shown by 0/ in FIG.

On the other hand, a leaf spring holding member 9 is fixed in the lower body 2 by screws 10, and a bag holder 1 is disposed at the center of the leaf spring holding member 9.
1, a stopper 12 is held in the upper (front) recess 11a as shown in FIG. is held and this disc spring 1
3. A damper composed of a weight 14 is designed to suppress vibrations (particularly resonance phenomena) accompanying the printing operation and accurately control the movement of each armature 8 and each print wire 15 connected thereto. There is.

However, in the conventional structure, the bag holder 1
A stopper 1 is inserted into the upper recess 11a through the stopper 1.
2. Since the weight 14 is assembled into the lower recess 11b, not only is it time consuming to assemble it, but also because the bag holder 11 is involved, the weight 14 is assembled into the lower recess 11b.
4. There was a problem in that the effect of the damper constituted by the disc spring 13 could not be sufficiently exhibited, and vibrations accompanying printing operations could not be sufficiently reduced.

〔the purpose〕

The present invention has been made in view of the above-mentioned prior art, and an object of the present invention is to efficiently absorb the impact of the armature, prevent the impact from being transmitted to the head cover member, and reduce the impact caused by the printing operation. To provide a wire dot head capable of exhibiting a high damping effect against vibrations.

[Summary]

The present invention provides a wire dot head for printing on a recording material by protruding a wire connected to the tip of an armature, which includes: a head cover member; and a stopper member having a convex portion that supports the vicinity of the tip of the armature. and is integrally provided in contact with the stopper member, and is biased by a spring member in the direction in which the wire protrudes with a reaction side surface separated from the head cover member from the contact surface with the stopper member; A weight member having an engaging part for engaging with a stepped part of the head cover member and regulating displacement caused by being biased by the spring member, thereby achieving the above object. It is.

〔Example〕

Hereinafter, details of the present invention will be explained using examples shown in the drawings.

FIG. 3 is a longitudinal sectional view showing the structure of the print head of the wire dot recording device according to the present invention, and the same parts as in FIG. 1 are given the same reference numerals. Each of the armatures 8 is positioned by a pin 15 fixed to the lower side of the side yoke 4a and a hole 16 into which the plunger 7 is loosely fitted. That is, it is pressed against the lower surface of the side yoke 4a by a leaf spring 17 arranged corresponding to each armature 8, and the vicinity of its tip is returned and held by a spring 18 and a stopper 12, thereby holding it in a predetermined position. Therefore, in a normal state, the armature 8 is in a lower non-operating position (retracted position) where it contacts the stopper 12 by the return spring 18 as shown in FIG. 3, and when the plunger 7 is attracted upward by the electromagnet, The spring 18
The distal end portion thereof is displaced upward by a predetermined distance to reach the operating position.

Further, at the tip of each of the armatures 8 arranged radially in a plurality of pieces (for example, 24 pieces),
The base end (rear end) of the printed wire 19 is connected. The printed wire 19 passes inside the boss member 3 and further passes through a plurality of guides 20, 2.
1, 22, and 23, and extends to the upper end (the tip of the print head) in FIG.

On the other hand, a printed circuit board 25 is attached to the upper side of the yoke 4 via an aluminum spacer 24 for heat radiation. The electric circuit on the printed circuit board 25 and the excitation coil 6 are connected via terminals 26 and 27.

Therefore, by controlling the code signal introduced via the printed circuit board 25, a plurality of code signals (for example, 24
The displacement of each armature 8 is controlled by controlling the energization to each of the excitation coils 6, and thus the recording is performed while controlling the displacement (protruding or normal retracted position) of these printed wires 19. A predetermined character or image is recorded on the recording paper 28 based on the correlation with the control of the moving speed of the print head in the width direction of the paper 28.

By the way, in the structure of this embodiment, as shown in FIG. 4, the member corresponding to the conventional bag holder is eliminated, and a weight 14 made of lead or the like is directly baked on the lower side of the stopper 12. It has a structure in which it is integrally fixed by means such as. Note that this weight 14 is connected to the lower body 2 via the disc spring 13.
This weight 14 and disc spring 13
The damper is configured to absorb shock during printing operation.

Therefore, in the structure of this embodiment, the effort of assembling the stopper 12 and the weight 14 to the bag holder 11 one by one as in the conventional case can be omitted, so that the assembly effort can be reduced.
Furthermore, by eliminating the bag holder 11 and adopting a structure in which the weight 14 is directly attached to the stopper 12, it is possible to eliminate the conventional problem in which the effect of the damper is reduced by the bag holder 11, and to reduce the effect of the damper. The effect is that it can be fully demonstrated.

In addition, since the armature 8 is supported by the convex portion of the stopper member 12, it is possible to efficiently absorb the impact of the armature 8.
Furthermore, since the stopper member 12 and the weight member 14 are floatingly supported via the spring member 13, it is possible to prevent the impact from the armature 8 from being transmitted to the head cover members 1 and 2. .

〔effect〕

As is clear from the above description, according to the present invention, a wire dot head for printing on a recording material by protruding a wire connected to the tip of an armature includes a head cover member, and a tip of the armature. a stopper member having a convex portion that supports the wire; and a stopper member that is integrally provided in contact with the stopper member, with a surface opposite to a contact surface with the stopper member being spaced apart from the head cover member in the direction in which the wire protrudes. a weight member that is biased by a spring member and includes an engaging portion that engages with a stepped portion of the head cover member to restrict displacement caused by being biased by the spring member; Therefore, by bringing the stopper member and the weight member into contact with each other and integrating them, it is possible to prevent the damper effect from decreasing, and the shock of the armature can be efficiently absorbed by the convex part of the stopper member. A wire dot head is provided which can prevent the impact from being transmitted to the head cover member by floatingly supporting the stopper member and the weight member through the head cover member.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the structure of a print head of a conventional wire dot recording device, FIG. 2 is an exploded perspective view of the bag holder, stopper, and weight shown in FIG. 1, and FIG. 3 is a diagram of a wire dot recording device according to the present invention. FIG. 4 is a vertical sectional view showing the structure of the printing head, and FIG. 4 is an assembled perspective view of the stopper and the weight. 6... Excitation coil, 8... Armature, 12
... Stopper, 13 ... Belleville spring, 14 ... Weight, 19 ... Printed wire.

Claims (1)

[Scope of Claims] 1. A wire dot head for printing on a recording material by protruding a wire connected to the tip of the armature, comprising: a head cover member; and a convex portion supporting the vicinity of the tip of the armature. a stopper member having a stopper member, which is integrally provided in contact with the stopper member, and whose surface opposite to the contact surface with the stopper member is urged by a spring member in the direction in which the wire protrudes, with the surface thereof being separated from the head cover member. A wire dot head comprising: a weight member having an engaging portion for engaging with a stepped portion of the head cover member and regulating displacement caused by being biased by the spring member.