JPS58167177A - Assembling method of printing head - Google Patents

Abstract

PURPOSE:To reduce the number of assembling steps and the assembling cost, by clamping an assembly by arch-shaped ring springs at the time of fixing the assembly, in a printing head for a releasing-type serial dot printer. CONSTITUTION:An armature member and a magnetic bypath 24 are placed on an electromagnet mechanism part (a permanent magnet 20 and a core 21) with a spacer 23 placed therebetween, and after fitting a nose 31 thereon, ring springs 30 are placed at 4 positions, and are gradually pressed further onto the nose 31 and a recessed surface of a lower part of the core 21 against the forces of the spring 30. Accordingly, the assembly is firmly clamped by the springs over the entire circumference thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION (&) Technical Field of the Invention The method of assembling a print head according to the present invention relates to a method of attaching an armature of a releasable print head to a magnetic path of an electromagnetic mechanism forming a magnetic path.

(b) Technical background FIG. 1 is an overall overview of an open-release serial printer. A frame 1 rotatably supports a platen 2 about its longitudinal axis, and is intermittently rotated by a motor (not shown) via a gear 3. Four types of paper are set by sprocketers 5a and 5b provided at both ends of the platen 2, and fed by the rotation of the platen 2. The print head 11 is guided by the rotating feed screw 8 via the carrier eFi guide shaft 7 and the space motor 9 (bell) 10, and moves along the platen 2 in the direction indicated by the arrow.
The carrier 6 is equipped with a plurality of printing wires 26 and an electromagnetic mechanism for driving them.
selectively driven in synchronization with the movement of the ink ribbon 1
An ink ribbon cassette 3 is housed in an ink ribbon cassette 12 and runs between the print head 11 and the paper 4.

FIG. 2 is a sectional view of the print head 11 in FIG.
) is a Confucian hundred drawings, and (b) is a top view. Wound core 21
An electromagnet formed by coil excitation and a permanent magnet 20 are provided in the same magnetic path.

In this magnetic path, one end of the armature 25 is held as a cantilever by a spacer 23, and the printing wire 2 is attached to the free end side of the other end.
6 is fixed, and the free end is normally attached to the core 21 by bending the gear part by the spacer 23 by the magnetic attraction force of the permanent magnet 20 [7], and by energizing the coil 22 during printing, it is permanently attached. The attractive force of the magnet 20 is cut off, and the armature 25 is separated from the core 21 by the elastic force caused by the bending. With this operation, the printing wire 26 rapidly approaches the platen 2 and hits the platen 2 hard through the ink ribbon 13 and the paper 4. When the ink from the ink ribbon 13 adheres to the paper 4, printing is performed. . Next, when the energization of the coil 22 is cut off, the free end is again attracted to the core 21 by the attractive force of the permanent magnet 20, and the printing wire 26 returns to its original position. The 7th step is to print a release type printer that is equipped with the above operations and prints.

A plurality of screw holes were drilled in the peripheral leaf spring forming the armature member, and screw holes were also drilled in the same position on the electromagnet side and fixed by screws 5. Since the above-mentioned leaf spring is a thin plate, it is necessary to fasten the screwed portion to correspond to the armature part, which has the disadvantage that the number of man-hours required for assembly is considerable.

(d) Object of the Invention In view of the above-mentioned problems, it is an object of the present invention to reduce the number of man-hours required for screwing and to reduce the assembly cost.

(e) Structure of the invention The constituent companies of the present invention to achieve the above objectives.

A single plate spring having a plurality of pieces extending from the periphery of the circle to the center of the core, each of which has a magnetic material attracted to the core equipped with a winding ring at the tip of the above-mentioned overhanging piece; There is an armature member to which a printing wire is fixed to the tip of a magnetic material, and the armature member is connected to an electromagnetic mechanism consisting of a permanent magnet forming a magnetic path and the core through a spacer, together with a side magnetic path member, at a position around the leaf spring of the armature member. In this method, the print head of a release type serial dot printer is fixed to the electromagnetic mechanism, and the print head is clamped and fastened by an arc-shaped ring spring when the print head is fixed.

(f) Embodiment of the Invention The method of assembling the print head according to the invention will be described below in detail with reference to the drawings. FIG. 3 is an explanatory diagram of an embodiment of the invention.

FIG. 5(a) is a side cross-sectional view of the assembled state, FIG. 2(b) is a top view of the assembled state, and FIG. 4(C) is a three-dimensional perspective view of the ring spring. In the figure, the same parts as in FIG. 2 are designated by the same numbers, and in FIG. 3, $30 is a ring spring and 31 is a nose. Figure (a)
As shown in FIG.
) from the side of the armature member 29 via the spacer 23.
After overturning the side magnetic path 24 and applying the nose 31 from above, tighten the ring spring 30 at four locations as shown in FIG. It is pushed into the lower concave surface of the core 21.

By doing this, it is firmly clamped and fixed around the entire circumference.

In this embodiment, four rings (rings) are used to clamp the entire circumference, but whether the ring spring is made into a narrow tube depends on the length of the arc-shaped wrinkle 9 of the ring spring. ) (The shape for producing pressure is arbitrary.

If you do so, the clamping force will further increase.

(g) Effects of the invention By replacing conventional screw fixing, there is no need for man-hours for machining screw holes, and it is easy to assemble and fasten by simply pushing it in. Furthermore, there is no need to damage parts during disassembly and repair. It also has the effect of being easily disassembled without any damage1.

[Brief explanation of drawings]

Figure 1 is an overall overview of the release type printer, a sectional view along the second line,
FIG. 3 is an assembly explanation, and in FIG. 9, 11 is a print head, 21L core, and 24 are side magnetic paths. 30 i,t! 31 is the nose.

Claims (1)

[Claims] (1) In the print head of a release type serial dot printer in which an armature member is fixed together with a side magnetic path member via a spacer to an electromagnetic mechanism consisting of a core that includes a permanent magnet forming a magnetic path and is equipped with a winding ring, The print head assembly method is characterized by fastening using arc-shaped ring springs.