JPS63297054A - Printing head - Google Patents

Abstract

PURPOSE:To reduce the resistance at a rotation fulcrum part to realize the good following of an armature and to enable a high-speed printing, by a method wherein a depressing member is made of a rigid body having an edge part to be brought into pressure contact with the armature at the edge part thereof. CONSTITUTION:An armature 1 is so supported as to be pinched from opposite directions between an edge part 2a of an outer circumferential part of an outer yoke 2 and an edge part 3a of a depressing member 3 formed opposedly to the edge part 2a. The depressing member 3 is integrally formed with a ring 4, and thereon a ring rubber 5 is fixed by the ring 4. With the electric supply to a coil 17, the armature 1 rotates toward an inner yoke 16 on the fulcrum determined by the edge part of the periphetary of the outer yoke 2 and the rigid body edge 3a. With the rotation of the armature 1, a printing is conducted using printing wires 9 with tip ends arranged in a predetermirred matrix form. The fulcrum of the armature 1 held by a linear contact makes an energy loss remarkably low at the fulcrum part of the armature 1 in the acuation of the armature 1 and, furthermore, the ring rubber 5 absorbs the shock occurring at the impact.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a print head, and particularly to a print head of a clapper set in which an armature is sandwiched between an outer yoke and a pressing member to form a rotational fulcrum.

[Prior Art] Conventionally, in the print head of this type of clapper set, the fulcrum of the armature is sandwiched between the edge part of the outer periphery of the outer yoke and the pressure contact member made of an elastic material, and the armature is moved from opposite directions. By applying pressure, a rotational fulcrum for the armature was formed.

[Problems to be solved] In the print head of the conventional clapper set described above,
Since the rotational fulcrum of the armature was formed by the edge part of the outer periphery of the actor yoke and the elastic body, the armature was in line contact with the edge part of the outer periphery of the outer yoke, but the elastic body This results in surface contact, which has the disadvantage of increasing resistance during armature operation, worsening followability, and impeding higher speeds.

[Means for Solving Problems] The present invention has been made to solve the above-mentioned problems of the conventional art. In the print head in which the armature is sandwiched between the pressing member and the armature to form a rotational fulcrum, the pressing member is formed of a steel body having an edge portion, and the edge portion of the pressing member is pressed against the armature.

[Example] Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 are diagrams showing one embodiment of the present invention.

In the figure, reference numeral 1 denotes an armature, which is supported by an edge portion 3a of a pressure contact member 3 formed at an edge portion 2a on the outer periphery of the outer yoke 2 so as to be sandwiched from opposite directions.

The pressure contact member 3 is integrated with a ring 4, and a ring rubber 5 is fixed thereon by the ring 4.

Further, the pressure contact member 3, the ring 4, and the ring rubber 5 are embedded in the stopper plate 6.

A cover spring 7 is located above the stopper plate 6 and pushes the stopper plate 6 downward. Further, the armature 1 is positioned by an armature guide 8 fixed to the outer periphery of the actuator yoke 2, and a printed wire 9 is fixed to the tip of the armature 1. The yoke 10 is fixed to the head frame 11, and a guide 12 is installed at the nose of the head frame 11 to align the tips of the printed wires 9 in a predetermined matrix, and a spring holder is installed at the convex part of the head frame 11. 13 is fixed.

Inside the spring holder 13, there are a return spring 14 for returning the armature 1 and an armature protector 15 for preventing the return spring 14 from directly contacting the armature. A coil-F is wound around the inner yoke 16. The rear cover 18 is attached to the head frame 11.

Then, when the coil 17 is energized, the armature 1 rotates in the direction of the inner yoke 16 about a fulcrum provided by the outer peripheral edge of the outer yoke 2 and the rigid edge 3. Accordingly, printing is performed using print wires 9 whose tips are arranged in a predetermined matrix. Next, when the power supply is stopped, the armature 1 returns to the return spring 1.
4 is pushed back toward the stopper plate 6, collides with the rubber provided on the stopper plate 6, and stops.

In this way, the fulcrum of the armature 1 is supported by line contact, so when the armature 1 moves, the energy loss at the fulcrum of the armature 1 is very small, and the ring rubber 5 absorbs the shock when hitting. be done.

FIG. 3 shows another embodiment. In this embodiment, the pressure contact member 23 made of a rigid body having an edge portion 23a is connected by a ring 24 made of a material that can move freely to some extent, so that assembly can be easily performed.

The other configurations and operations are the same as those in the previous embodiment, so their explanations will be omitted.

FIG. 4 shows yet another embodiment. In this embodiment, a pressure contact member 33 made of a rigid body having an edge portion 33a is connected by a ring 34 made of a material that can move freely to some extent, and a ring rubber 25 is integrally provided on this ring 34. This makes assembly even easier.

The other configurations and operations are the same as those in the previous embodiment, so their explanations will be omitted.

[Effects of the Invention] As explained above, the present invention has an edge portion of the outer yoke outer periphery and a pressure contact member made of a rigid body having an edge portion. Since the armature forms a rotational fulcrum, both the contact parts of the armature with the outer yoke and the pressure contact member are in almost line contact, reducing the resistance at the rotational fulcrum, allowing the armature to follow better and enabling high-speed printing. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a clapper set print head according to an embodiment of the present invention, FIG. 2 is a perspective view showing the pressure contact member of FIG. 1,
FIG. 3 is a perspective view of a pressure contact member according to another embodiment, and FIG. 4 is a perspective view of a pressure contact member according to still another embodiment. 1: Armature 2: Outer yoke 2a: Edge portion 3.23, 33: Pressing member 3a, 23a, 33a: Edge portion 4: Ring 5: Ring rubber

Claims (1)

[Claims] In a print head in which an armature is sandwiched between an edge portion of the outer periphery of the outer yoke and a pressure contact member to the outer yoke side to form a rotational fulcrum of the armature, the pressure contact member is formed of a steel body having an edge portion, A print head characterized in that an edge portion of the pressure contact member is brought into pressure contact with the armature.