JPS58162352A - Armature of printing head - Google Patents

Abstract

PURPOSE:To decrease a defective rate, in the release type serial dot printer, by fixing the magnetic material to a plurality of protruded pieces converged from a peripheral part of a plate spring of an armature member, and fixing a printing wire to the tip of each magnetic material. CONSTITUTION:The armature of the printing head forms a plurality of protruded pieces, which are converged to the center from a circumferential part of a member 28. A magnetic material 25 is fixed to the tip of the piece so that a gap G between a core 21 and a spacer 23 is assured. A printing wire 26 is fixed to the tip of the magnetic material 25. When warping is present in a plate spring 28, which fixes the magnetic material 25, and the gap G is narrowed, the specified gap G is assured by polishing the magnetic material 25, and the occurring rate of defective products can be decreased. Said magnetic material 25 is normally attracted by a permanent magnet 20. The attracting force of the magnet 20 is cancelled by conducting a current through a coil 22 at the time of printing and the printing wire 26 is operated rapidly.

Description

[Detailed description of the invention] (a) Technical field of the invention The amateur of the print head that is the invention of this application.

Regarding the armature forming body that constitutes the print head of a serial printer, there is a gap between the armature and the core surface! I! Regarding the amateur formation that is possible.

(→Technical Background Figure 1 is an overall overview of a free-standing serial printer. A frame 1 supports a platen 2 rotatably around its longitudinal direction, and is connected to a motor (19), not shown, intermittently via a gear 3. can be rotated.

The paper 4 has sprockets 5a provided on both sides of the platen 20,
51) and is fed by rotating the platen 20 times. The middle spear is guided by the feed screw 8 which rotates from the guide shaft 1 and the space motor 9 via the bell) loii, and moves along the planar /2 in the direction of the arrow 4! l
#do. The print head 11 is mounted on a carrier 6, inside which a plurality of print wires 26 and an electromagnet mechanism for driving them are provided, and the electromagnet mechanism is selectively agmized in synchronization with the movement of the carrier 6. The ink ribbon 13 is placed in the ink ribbon cassette 12 and runs between the print head 11 and the paper number.

Figure 2 is a sectional view of the printing pad 11 in Figure 1 (I
I) is a side rfJ diagram, (→ is the upper surface - 2 (a) is a sectional view of the armature. It is wound and consists of nine cores 21, and is installed in the same magnetic path as the electromagnet and permanent magnet 20 by excitation of nine coils.] Within this magnetic path, one end of the armature 26 t-swivel 23
The complement t is held on the cantilever beam, the printing wire 26t is fixed to the free 4III at the other end, and the gear G branch tube II is normally connected by the spacer 23 with the magnetic attraction force of the permanent magnet 1aOQ.
The free end is attracted to the core 21, and when printing, the coil 22fC is energized to cut off the attractive force of the permanent magnet 20, and is separated from the core 21 by the elastic force caused by the deflection of the apertures and detents 26.

With this operation, the printing wire 26 rapidly approaches the platen 2, and when the ink ribbon 13 and the paper 4Yr are swept through the platen 2f, the ink of the ink ribbon 13 adheres to the paper 4, thereby printing.

Next, when the coil 22 is de-energized, the permanent magnet 2 is turned off again.
The free end is attached to the core axKlk by a suction force of 0, and the printing wire 26 returns to its original position.

(e) The armatures and parts used in the past are as shown in Figure 8 (kl), which differs from the conventional technology.
As shown in (0), it is composed of a single piece, and a magnetic -25 is fixed to the upper end side of the protruding piece 28 of the round plate spring with a solder or the like. Since the leaf spring is thin, warpage inevitably remains on the overhang 'M'. The amateur is obtained by supplementing the core surface with a spacer, and the gap G surface is maintained for a predetermined distance l! must be reserved. However, the protruding piece from the leaf spring (usually 16 to 24 pieces) ((1) Object of the Invention The object of the present invention is to make it possible to absorb the above-mentioned disadvantages during processing, reduce the defective rate of the leaf spring, and Cost) The aim is to provide amateurs who make food at low cost.

(・) Structure of the Invention Amachi 1 of the print head according to the present invention that achieves the above object
A is 41 which extends from the periphery of the circle to the center of the circle.
A single plate spring having several pieces has a magnetic material attracted to the core attached to the winding ring T at the tip of each overhanging piece, and a printing wire is fixed to the tip of the magnetic material. The member is configured such that the electromagnet mechanism comprising a permanent magnet forming a magnetic path and the core is provided with the EIIIK electromagnetically opposed to the side magnetic path member at a position around the leaf spring of the armature and the A member via a spacer. What it does is what makes it special.

(f) Examples of the invention The present invention will be described below using figures.

Figure 43 shows an example of the present invention, which is an example of an amachi tame-a, which has a shape fixed with brazing etc., and when the spaced leaf spring 28 is warped and the gap G is narrowed, 25t is applied to the magnetic 1. - It is a structure in which a predetermined gap G is corrected by polishing.

(2) Effects of the Invention By forming the armature according to the present invention, it is possible to absorb and correct variations in the individual warpage of the overhanging pieces of the leaf spring by polishing with magnetic cutting, which has a great effect of reducing the incidence of defective products. be.

[Brief explanation of the drawing]

Claims (1)

[Claims] (1) An electromagnetic mechanism consisting of a core that includes a permanent magnet that forms a magnetic path and is equipped with a winding ring is connected through a spacer to the center of the magnetic mechanism along with the path member, and the A member is fixed to the O print head of a serial dot printer. , said amateur≠17
The member is a single leaf spring consisting of multiple pieces t4r that protrude from the entire periphery toward the center, and a magnetic material is provided at the tip of each of the protruding pieces, and furthermore, one printing wire is attached to the tip of the magnetic material. 1. A print head armature, characterized in that the armature of a print head has a structure in which a magnetomotive material is provided at least on a surface facing the core.