JPS58132567A - Print head - Google Patents

Abstract

PURPOSE:To provide a print head composed of lesser number of parts which is easy to assemble and maintain by such an arrangement wherein the flange of a wire housing is pressed by a heat sink and an armature guide is compressed with a pressing plate. CONSTITUTION:A heat sink 8 surrounding the outer circumference of a print solenoid 3 compresses the flange 2 of a wire housing 1 which positions one end of the print solenoid. A pressing plate 18a fixed to the opening of the heat sink 8 compresses an armature guide 16 which is brought to contact with the other end of the print solenoid. Since the wire housing 1 is not fixed to the print solenoid 3 with screws, the processing of the print head becomes easier.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a print head in which a print matrix is formed by a wire, and in particular, a heat sink surrounding the outer periphery of a print solenoid presses a flange of a wire housing. Regarding the structure of the print head.

[Technical background of the invention]

This type of print head is generally referred to as a wire type print head. Printers equipped with this print head are becoming faster and heavier duty year by year. Under these conditions, a lot of heat is generated in the print lens that attracts the armature and pushes out the wire. In conventional print heads, heat generated in the print solenoid is dissipated by a heat sink surrounding the print solenoid. There are two types of heat sinks: those formed integrally with the wire housing and those formed separately from the wire housing.

The print head shown in FIG. 1 is constructed by separately forming a heat sink and a wire housing and then assembling them.

In the figure, 1 is a wire housing. A seven flange 2 having an appropriate size is formed at the center of the outer periphery of this wire housing 1. This flange 2 is for positioning and fixing one end of the printing solenoid 3.

The printing solenoid 3 includes a cylindrical core 4 having a hole in the center having a hole approximately the same size as the outer diameter of the wire housing 1, a plurality of iron cores 5 fixed to the bottom surface of the core 4, and a plurality of iron cores 5 wound around the iron core 5. It is composed of a coil 6. This printing solenoid 3 is connected to the wire housing 1 in the hole of the core 4.
are fixed with a plurality of screws 7 so that they fit together and the 7 langes 2 and the back surface of the core 4 are visible.

8 is a heat sink. This heat sink 8 includes a cylinder member 9 that surrounds the outer circumference of the printing solenoid 3, that is, the outer circumference of the core 4, and a plate-like member 10 that abuts the back surface of the core 4 and has a hole in the center that is slightly larger than the outer diameter of the 7 flange 2. It consists of As shown in the figure, these two members 9 and 10 are fixed to each other with a plurality of screws 11 and are formed into a cylindrical shape.

12 is a wire formed longer than the wire housing l. The wires 12 have the same number as the iron cores 5, and are movably held and appropriately arranged in the through holes of the wire housing 1 in the printing direction so that the printing trisox is formed. The valley wire 12 has a compression coil spring 13 in contact with the end surface of the wire housing l at the end opposite to the printing direction.
is attached, and a spring retainer 14 is fixed to prevent the compression coil spring 13 from coming off.

15 is the armature, which carries the same number as the iron core 5. Each armature 15 is arranged to extend from the end surface of the cylindrical portion of the core 4 to the center directly above the iron core 5. The tip of the armature 15 contacts the wire 12 via the spring holder 14, and the other end contacts the end surface of the cylindrical portion of the core 4, serving as a center of rotation.

16 is the armature guide, which is the printing solenoid 3.
A guide 17 is formed inside and in contact with the other end to guide the armature 15 to the iron lL1>5.

18 is a presser plate. This presser plate 18 presses the armature guide 16 and is fixed to the cylinder member 9 of the heat sink 8 with a plurality of screws 19. An armature stopper is fixed near the inner center of the presser plate 18 to determine the position when the wire 12 returns.

The print head configured in this manner applies current to the print solenoid 3, that is, sends current to the coil 6 of the print solenoid 3, attracts the armature 15 with the iron core 5, and pushes out the wire 12 that is in contact with the tip of the armature 15. In front of wire housing 1? Tod is written on a recording paper (not shown in FIG. 1) held in i+.

When the current flowing through the coil 6 is cut off, the wire 1
2 and the armature 15 are returned to their original positions by the compression coil spring 13.

On the recording paper, characters, figures, and other symbols are represented as a set of tods.

[Problems with background technology]

A wire housing and a heat sink that are integrally formed have a complicated shape and are difficult to process, and it is generally uneconomical to integrally form parts that are subject to high wear and those that are not. Furthermore, when this type of print head is mounted on a printer, maintenance of the print head becomes troublesome.

Therefore, in the conventional print head, the wire housing and the heat sink are formed separately, and the heat sink is further divided to simplify the shape.

In this way, it can be said that conventional print heads are easy to process and maintain, but on the other hand, many screws are required to assemble these parts, and workers are forced to deal with the complexity of parts management and assembly. .

Nowadays, as processing technology advances and the demand for printers increases, rather than processing problems, print heads have a structure that reduces the number of print head parts, makes assembly easier, and makes maintenance easier. It is hoped that it will appear.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object thereof is to provide a print head that reduces the number of parts and facilitates assembly and maintenance.

[Summary of the invention]

The present invention is characterized in that the wire housing is not screwed to the printing solenoid. This is a heat sink that surrounds the outer periphery of the printing solenoid.For example, the inner 7 langes protrude from the heat sink, hold down the 7 langes of the wire housing that positions one end of the printing solenoid, and fix it to the opening of the heat sink. The above objective was achieved by pressing the armature guide, which was in contact with the other end of the printing solenoid, with the holding plate.

Preferably, the holding plate is fixed to the heat sink without using screws, but with a stop such as a C-ring, or a claw and a groove or protrusion that engages with the claw.

[Embodiments of the invention]

FIG. 2 shows a specific embodiment of the present invention. In this figure, since the same reference numerals indicate the same names, the explanation of the matters explained in the technical background will be omitted. Hereinafter, embodiments will be described in detail with reference to the drawings.

The heat sink 8 in this embodiment has a cylinder member 9 and an inner flange 10a integrally formed.

The inner 7 flange 10a extends from one end of the cylinder member 9 toward the center, and has a stepped portion so that it can overlap the 7 flange 2 of the wire housing 1 and press this 7 lange 2 against the back surface of the core 4 of the printing solenoid 3. It is formed. The inner diameter of the inner 7 flange 10a is formed to a size such that the wire housing 1 can be inserted therein.

Further, at the other end of the cylinder member 9, a ring-shaped groove 21 necessary for pressing the armature guide 16 with the presser plate 18 and fixing the presser plate 18a to the heat sink 8 is formed on the inside of the cylinder member 9. has been done. The width and depth of this groove 21 are appropriately selected so that the C ring n can be fitted therein.

The U IJ ring 22 is a known one and is generally commercially available.

The configuration of the print head in this embodiment is as follows. Next, the procedure for assembling this print head will be described.

First, the operator first
Insert the wire housing l into the hole a, and attach the inner flange) i
Position and push in so that the step part of the OA and the flange 2 of the wire housing 1 come into contact.

Next, the operator inserts the printing solenoid 3 between the wire housing 1 and the heat sink 8, and pushes it in until the back surface of the core 4 comes into contact with the 7 flange 2.

Furthermore, after confirming the positional relationship between the through holes of the wire housing 1 and the iron core 5, the operator inserts the wires 12 equipped with the compression coil springs 13 into each through hole.

After that, the operator places the armature 15 passing directly above the iron core 5 so as to straddle the cylindrical end face of the core 4 and the spring retainer 14 fixed to the wire 12, and then inserts the armature guide 16 from above. Press the guide 17 so that it is directly above the armature shaft 15, and press the cylinder member 9.
Push it into.

After checking the lead wire of the coil 6, etc., the operator presses the armature guide 16 with the holding plate 18a to expose the groove 21 formed in the cylinder member 9, and fits the C-ring 4 into this groove 21. The holding plate 18 is the armature guide 1
It is tightly attached to the C-ring 4 due to the elasticity of the heat sink 8 and is fixed to the heat sink 8. On the other hand, due to the reaction, the inner flange 10a of the heat exchanger 8 is brought into a state in which it presses against the 7 flange 2 of the wire housing 1.

In this way, assembly of the print head is completed.

In this example, no screws are used to connect the parts, so the number of parts is extremely small, and the holding plate is fixed to the heat sink with a C-ring, making assembly extremely easy. It can also be said that maintenance is very easy.

〔Effect of the invention〕

As explained above, according to the present invention, since the number of parts is small and the structure is easy to assemble, it is possible to reduce the complexity of parts management and assembly for workers, and also to speed up maintenance. became.

In addition, the fewer screw points there are, the easier the processing becomes.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional print head, and FIG. 2 is a sectional view showing an embodiment of the present invention. l...Wire housing 2...Flange 3...
・Printing solenoid 4...core 5...iron core
6... Coil 7.11.19... Screw 8... Heat sink 9... Cylinder member
10...Plate-like abduction 10a...Inner 7 lunges
12... Wire 13... Compression coil spring
14... Spring holder 15... Armature 16... Armature guide 17... Guide 18
, 18a... Presser plate processing... Armature stopper 21... Groove 22...
C-Ring agent Patent attorney Noriyuki Chika (and 1 other person) 11- Figure 1

Claims (1)

[Claims] In the print head that prints by energizing the printing solenoid to attract the armature and pushing out the wire that is in contact with the tip of the armature, one end of the printing solenoid is positioned by a heat sink surrounding the outer periphery of the printing solenoid. The print head is characterized in that an armature guide that is in contact with the other end of a print solenoid is pressed by a holding plate that is held down by seven lunges of a wire housing that is attached to the heat sink and is fixed to an opening of a heat sink.