JPS61284460A - Printing head - Google Patents

Abstract

PURPOSE:To inexpensively provide a printing head having high reliability and excellent in high-speed operation, by integrally molding a plurality of high- rigidity armatures having a spring part and a projection provided by projecting processing along with a ring shaped plate. CONSTITUTION:An armature spring disc 2 is integrall molded from a disc having a ring-shaped projection A concentrically molded thereto by fine blanking and, in order to enhance the rigidity of the leading arm part of an armature part 2a, a projection 2c is further provided to said armature part 2a by projecting processing. The armature spring disc 2 has a ring-shaped plate and a plurality of armatures radially arranged so as to direct the leading ends thereof to the center of the ring-shaped plate and connected to the ring-shaped plate at the rear ends thereof through spring parts. All of the armatures, the spring parts and the ring-shaped plate are molded from an integral place having springiness.

Description

TECHNICAL FIELD This invention relates to printheads, and more particularly to printheads for use in dot matrix printers.

With the recent PC/OA boom, many small, multi-core print heads that print characters and figures using multiple print wires have been developed. Market demands require increasingly higher density, smaller size, and lower cost. Conventionally, most print heads of this type have a basic configuration using electromagnets as a means of driving the print wire, and the magnetic circuit uses an integrally molded product using the so-called lost wax method, and the movable part uses an electromagnet. Most of them used armatures in which multiple parts were joined together by brazing or caulking.

However, in the above-mentioned conventional print head, the movable part is composed of a plurality of parts, so that it is not possible to reduce the price. It also has drawbacks such as reduced reliability due to variations in the strength of the joints. On the other hand, in the case of an integral structure made of plate material, there is a drawback that high-speed operation cannot be achieved because sufficient rigidity cannot be obtained.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to provide a print head that is highly reliable, has a simple construction, and is capable of high speed operation.

According to the present invention, a ring-shaped plate is arranged radially such that each tip faces the center of the ring-shaped plate, and each rear end is connected to the ring-shaped plate via a spring portion. It consists of a plurality of armatures and a protrusion provided on each end arm portion of the armature, and is characterized in that these armatures, a spring portion, and a ring-shaped plate are all integrally molded from a magnetic material having spring properties. A print head is obtained.

Friend Satsuki Next, the present invention will be explained in more detail with reference to the drawings showing one embodiment of the present invention.

Referring to FIG. 1, one embodiment of the present invention has an armature spring portion 2a having a printed wire 1 fixed to its tip.
A plurality of armature spring disks 2 arranged radially, and a plurality of electromagnetic driving means 4a for driving the armature spring portion 2a are connected to the armature sling 2.
a, the electromagnetic driving means assembly 4 arranged to face each other via the auxiliary magnetic path plate 3, the main guide 5 for aligning the tip of the printed wire 1 at a desired position, and the printed wire 1 are operated. It consists of a guide plate 6 to prevent lateral vibration when the main guide and the guide plate are placed in a predetermined position, and a frame 7 in which the main guide and the guide plate are arranged at predetermined positions. It is fixed to the means assembly by means of mounting screws 8.

As shown in Fig. 2, the armature spring disk 2 is integrally molded into the shape shown in Fig. 3 by fine blanking from a disc on which ring-shaped protrusions A are formed concentrically. In order to improve rigidity, projections 2C are provided by extrusion processing.

The armature spring disk 2 has a ring-shaped plate and a plurality of armatures arranged radially such that each tip faces the center of the ring-shaped plate and each rear end is connected to the ring-shaped plate via a spring portion. It is the composition. The armature, spring portion, and ring-shaped plate are all formed from a single unit made of a magnetic material having spring properties.

As shown in FIG. 4, the electromagnetic drive means assembly includes a plurality of electromagnetic drive means each consisting of a U-shaped yaw 4b formed by sintering or forging, a permanent magnet 4C, and a coil 4D arranged radially. It is integrally molded using insert molding.

11. As explained above, the present invention has high reliability by integrally molding a plurality of highly rigid armatures having spring portions and protrusions subjected to protrusion processing with a ring-shaped plate, etc. Moreover, there is an effect that a print head excellent in high-speed operation can be provided at a low cost.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an embodiment of the present invention, FIGS. 2 and 3 are views showing the molded material of the armature spring disk and the shape after molding, and FIG. 4 is a perspective view of the electromagnetic drive means. . Explanation of symbols of main parts 1... Printed wire 2... Armature spring disc 2a.
... Armature 2C ... Protrusion

Claims (1)

[Claims] a ring-shaped plate; a plurality of armatures arranged radially such that each tip faces the center of the ring-shaped plate and each rear end is connected to the ring-shaped plate via a spring portion;
A print head comprising a projection provided on each end arm portion of the armature, and wherein the armature, the spring portion, and the ring-shaped plate are all integrally molded from a magnetic material having spring properties.