JPS59185659A - Armature assembly for dot printer - Google Patents

Abstract

PURPOSE:To attain to increase a soldering area by rightly limiting a soldering contact angle of a print wire, by improving the shape of a groove shaped recessed part of an armature or the shape in the vicinity thereof. CONSTITUTION:An armature material 1 of which the leading end surface is flat is held in a compressed state from the side surface thereof by side holders 2, 2 and from the upper and lower surfaces by upper and lower holders 3, 3. When a tool 4 is introduced under pressure to the direction shown by the arrow 4', a V-shaped recessed part according to the shape of the tool 4 is formed to the leading end surface of the armature material 1 and the plastic flow generated by this processing is inhibited in a right and left directions by the side holders 2, 2 while inhibited in the axial direction thereof by the step part 5 provided to the tool 4 and the armature material flows toward the advance part provided to the leading end part of the upper and lower holders 3, 3. Therefore, the armature becomes long in the length (t') of the groove shaped recessed part thereof into which a print wire is inserted with respect to the thicknees (t) of the armature material 1 and the soldering part strength of the print wire can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an armature assembly formed by bonding an armature and a print wire used in a wire dot type printer head, and a method for manufacturing the same, and particularly relates to improving the bonding viscosity and bonding strength.

It is something that

Wire-dot printers transmit the movement of an armature, which is pulled or repelled by an electromagnet, to a print wire connected almost perpendicularly to the tip of this armature, and the end surface of this wire connects recording paper, etc. to an ink ribbon, etc. This is a device that prints dots by striking the ball through the .

Conventionally, various methods have been proposed for connecting the printed wire and the armature. Among them, a U- or V-shaped groove-like recess is formed on the tip surface of the armature, and the outer diameter of the end of the printed wire is inserted into this recess. There is a known method of inserting and soldering. The purpose of forming this groove-like recess is to restrict the soldering of the printed wire to the armature and to increase the facing area for soldering. However, the formation of groove-like recesses with this method is
Conventionally, it has been formed by punching simultaneously with the punching of the armature body material, or by mechanical cutting after punching the armature body.

When a groove-like recess is formed by simultaneous punching, the groove-like recess has sagging, fractured surfaces, etc. peculiar to punching, and its shape is drum-like. The angles of the soldered parts of the printed wires to the two wires vary, and as a result, bending stress is generated in the wires during use, causing the printed wires to easily break and shorten their service life. The purpose of forming these groove-like recesses by mechanical cutting etc. is to improve the shape of these four parts to some extent, but this processing requires a large number of man-hours.
It still wasn't enough.

The present invention improves the shape of the groove-like recess of the armature and its vicinity, thereby correctly regulating the soldering angle of the printed wire and increasing the soldering area, thereby achieving a fatigue-resistant soldering part. The purpose is to provide assembled products.

The present invention is characterized in that the armature is formed by press-fitting a tool into the end face of the armature, so that it is possible to obtain an assembled product shape, and it is also possible to form a shape that is impossible by punching or cutting, and furthermore, it is possible to obtain a shape that is impossible by punching or cutting. Therefore, a large soldering area can be obtained, and since the contact portion with the printed wire becomes long, the soldering angle can be made more accurate.

Next, the present invention will be explained in detail with reference to Examples. Fig. 1 is an example showing the method of processing a groove-like recess according to the present invention, and A is a plan view, and B is an X-Y
It is an arrow view, and B is a force 1 view.

The armature material 1, which has a flat end surface, is compressed and held by side holders 2.2 and upper and lower surfaces by upper and lower holders 3.3, respectively. When the tool 4 is press-fitted in the direction of the arrow 41, the armature material 1 has four V-shaped parts that follow the shape of the tool 4 on the tip surface, and the rectangular flow produced by this machining causes side holders 2.2 in the left and right direction. It is blocked in the axial direction by a stepped portion 5 provided on the tool 4, and flows toward a groove provided at the tips of the upper and lower holders 3.3, resulting in a shape as shown in FIG. 2. For this reason, in the armature according to the present invention, the length of the groove-shaped recess into which the printed wire is inserted is longer than the thickness t of the material, t', which makes it difficult to solder the printed wire.

Blood strength can be improved.

This embodiment has a feature that the tool 4 has a simple shape.

Next, FIG. 3 shows an example of the shape of the cut surface of the armature tip according to another embodiment. A has a surface 1a that comes into contact with the end surface of the print wire, and serves to regulate the axial position of the print wire and to receive shock during use to prevent an excessive increase in shearing force at the soldered portion. In addition, the sword is an example of forming a hollow part to make the gap between the outer circumferential surface of the printed wire and the gap ring, thereby realizing the permeation and filling of the wax.

All of these can be achieved extremely easily by the present invention.

As described above, according to the present invention, it is possible to form an accurate groove-like recess by press-fitting a tool, thereby preventing variations in the soldering angle of printed wires and increasing the contact or opposing area. This makes it possible to provide an armature assembly with an improved lifespan at a low cost since the strength of the soldered portion can be improved.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the method of processing the groove-shaped groove of the armature tip of the present invention, Fig. 2 is a perspective view showing the shape of the armature tip by the processing method of this embodiment, and Fig. 3 is FIG. 7 is a cross-sectional view showing the shape of the tip of another example. 1: Armature material, 2: Side holder, 3: Upper and lower holder, 4: Tool. Figure 7, Figure 3, 4 B

Claims (1)

[Claims] In an armature assembly for a dot printer, the armature has a groove-shaped IE7 part formed on the end face, and a print wire is fitted with its outer diameter into the inner surface of the recess, and the two are soldered together. An armature assembly for a dot printer, characterized in that the armature assembly is shaped by generating plastic flow in the axial direction of the spiral El, thereby increasing the contact or opposing area between the inner surface of the spiral El and the outer diameter surface of the print wire.