JPH04163056A - Dot printer armature and production thereof - Google Patents

Abstract

PURPOSE:To eliminate the need for brazing a printing wire mounting part with an armature body to reduce production processes and improve an yield by a method wherein the printing wire mounting part made of a thin wall part is formed integrally with the armature body made of a thick wall part. CONSTITUTION:While processing a rectangular long material (a) loaded on a flat die 4, a pressing roller 5 is reciprocated, for example, from a position A to a position B. The rectangular long material (a) is moved rearward from the tip end of the flat die 4 by a predetermined length S. This action is repeadedly conducted, whereby the upper and lower surfaces of the rectangular long material (a) gradually collapse by acute-angle parts at the tip ends of projected strips 7, 6 of the pressing roller 5 and the flat die 4. A thin wall part is formed at the center of the material (a), and a profile long material (b) is formed. The profile long material (b) is appropriately cut at approximately the center thereof to be longitudinally divided. In this manner, a profile long material (c) provided with a thin wall part and a thick wall part is obtained. By cutting profile long material (c) orthogonally to the longitudinal direction thereof, an armature 1 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an armature constituting a wire assembly and a method of manufacturing the same.

[Conventional technology]

Generally, the print wire assembly of a free-end type serial dot printer has an armature (12
) and a printing wire (13), the armature (12) includes a printing wire attachment part (14) formed from a thin plate member that joins the end of the printing wire (13), and an electromagnet (not shown). It consists of an armature body (15) that is attracted and separated by
It is formed by inserting and joining one end of the

Printing wire attachment part (14) of the above armature (12)
A printing wire assembly is constructed by joining a printing wire (13) to the end of the printing wire.

In forming the armature, the armature main body (I5) and the printing wire attachment part (14) are formed by cutting, forging, or wire electric discharge machining, respectively, and the armature main body (15) and the printing wire attachment part (14) are formed by cutting, forging, or wire electric discharge machining.
This is done by joining them together by brazing.

[Problem to be solved by the invention]

In the armature described above, the printing wire attachment part and the armature main body are constructed as separate bodies and are joined by brazing, so that the following problems occur.

Seal: The manufacturing process increases and the work becomes complicated.

(2) During brazing, defective products are likely to occur, resulting in poor yield.

(c) Due to the increased weight due to the use of brazing filler metal, high-speed printing becomes reversed.

) The mechanical precision is poor and the armature is expensive.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an armature for a dot printer that has good mechanical precision and is suitable for mass production at a low cost.

[Means for Solving the Problems] In the present invention, the first invention provides an armature for a dot printer in which a printing wire attachment part for joining a printing wire and an armature main body that is attracted and separated by an electromagnet are integrally molded. A second invention provides a method of rolling a substantially central portion or both sides of a rectangular elongated material in the longitudinal direction to form an irregularly shaped elongated material having a thin wall portion at the central portion or both sides;
Next, the irregularly shaped elongated material is cut in the longitudinal direction from approximately the center to form an irregularly shaped elongated material having a thin wall part and a thick walled part, and the obtained irregularly shaped elongated material is cut in a predetermined direction perpendicular to the longitudinal direction. The present invention provides a method for manufacturing an armature for a dot printer that cuts width.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

[Example 1] As shown in FIG. 1, the armature (1) has a thickness of about 0,
It consists of a 2I printing wire attachment part (2) and an armature body (3) with a thickness of about 1°8H.
) is integrally formed at the center of the tip of the armature body (3). The width is 1.5 m.

[Embodiment 2] A manufacturing method for manufacturing the armature as described above will be explained based on FIGS. 2 to 6.

In FIG. 2A, (4) indicates a flat die having an acute angle at the tip, and one end of a long rectangular material a made of magnetic steel is placed on the upper surface of the flat die (4). A pressing roller (5) is arranged to face the flat die (4) and roll in a range from its tip to its rear end.

As shown in FIG. 3A, approximately at the center of the pressure roller (5), there is a protruding strip with an acute tip provided on the top surface of the flat die (4) in FIG. A protrusion (7) similar to (6) with an acute angle at the tip is provided over a required range in the circumferential direction.

While the pressing roller (5) presses the rectangular long material a placed on the upper surface of the flat die (4), as shown in FIG. The rectangular long material a is moved backward by a predetermined distance S from the tip of the flat die (4) upon completion of this reciprocating movement. Then, repeat the above operation.

In this way, the upper and lower surfaces of the rectangular long material a are formed by the pressing roller (5) and the protruding strips C6) of the flat die (4).
, (7) is gradually crushed from the sharp corner of the tip,
It is crushed to the maximum width at its rear end to form a thinner part in the center, forming an irregularly shaped elongated material having a cross-sectional shape as shown in FIG. 4A.

Next, by appropriately cutting the irregularly shaped long material C so as to divide it in the longitudinal direction approximately at the center thereof, the irregularly shaped long material C having a thin wall part and a thick wall part as shown in FIG. 5 is obtained. Gain,
Next, by appropriately cutting this irregularly shaped long and long stroke C into a predetermined width in a direction perpendicular to its longitudinal direction, an armature (1) as shown in FIG. 1 is formed.

In addition, as a method of forming a thin wall part in a rectangular long material a,
Not limited to the above rolling method, for example, as shown in Fig. 6A,
A pair of pressure rollers (9) provided with a plurality of wedge-shaped strips (8)
A rectangular long material a is passed between them, a plurality of grooves (10) are carved in advance in the approximate center of the rectangular long material a, and the irregularly shaped long material obtained as described above is shown in Fig. 5 ( As shown in Fig. 4 (b), by sequentially rolling with a group of pressing rollers (11) having different rolling widths, a cross-sectional shape as shown in Fig. 4 (f) having a thinner part in the center is obtained. It is also possible to form an irregularly shaped elongated material having a

Furthermore, in the above embodiments, the substantially central part of the rectangular long material was thinned, but the invention is not limited to this, and both sides of the rectangular long material may be rolled to create an irregular length as shown in FIG. 4(b). It may also be used as a length material d.

〔Effect of the invention〕

In the armature for a dot printer of the present invention, the printing wire attachment part made of a thin part and the armature body made of a thick part are integrally molded, so there is no need to braze the two, and the manufacturing process can be greatly simplified. It is possible to improve yield and reduce weight.

Further, according to the manufacturing method of the present invention, the thin wall portion does not wave or break, and continuous processing is possible, so the armature for the dot printer of the present invention can be manufactured efficiently and at low cost. It has excellent effects.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the armature for a dot printer of the present invention, and FIGS. 2A and 2B are plan views showing an example of the manufacturing apparatus used in the manufacturing method of the present invention. (B) is a sectional view taken along the line X-X, the mark in FIG. A sectional view showing an embodiment of the irregularly shaped long material obtained by cutting the irregularly shaped long material, FIGS. 7 is a perspective view showing a printing wire assembly for a conventional dot printer. (1), (12)...Armature, (2)
), (14)... Printing wire attachment part, (3),
(15)... Armature body, (4)...
...Flat die, (5), (9),' m)...
...Press roller, (6), (7)...Protruding strip, (8)...Wedge-shaped strip, (10)...-
Groove, (16) Concave groove, a... Rectangular long material, b, c, d... Irregular long material.
Ding 1 Figure 2 (b) 3rd! ”1 (B) (C) 4th
Figure 5 Figure 7

Claims (2)

[Claims] (1) An armature for a dot printer in which a printing wire attachment part that connects a printing wire and an armature body that is attracted and separated by an electromagnet are integrally molded. (2) Rolling a rectangular long material in the approximate center or both sides in the longitudinal direction to form an irregularly shaped long material having a thin wall portion at the center or both sides, and then rolling the irregularly shaped long material approximately at the center. It is characterized by cutting in the longitudinal direction to form a deformed long material having a thin wall part and a thick wall part, and further cutting the obtained deformed long material into a predetermined width in a direction perpendicular to the longitudinal direction. A method of manufacturing an armature for a dot printer.