JPH0541795U - Print lever and print wire connection structure - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents air bubbles from remaining in the reinforcing plate, reliably increases the strength of the joint between the print lever and the print wire, facilitates brazing work, and extends the life of the print head. Try to. [Structure] A rear end portion 2b of the printing wire 2 is inserted in the center of a U-shaped reinforcing plate 3 made of a thin metal plate, and both end portions 3b and 3b of the reinforcing plate 3 are attached to the front end portion 1b of the printing lever 1. It contacts at least both side surfaces of the print wire 2 on the side of the tip 2a. The reinforcing plate 3 has a notch 3c formed at a position that does not affect the reinforcing strength.
And the print lever 1 are brazed. The cutout portion 3c is not only the center portion of the curved portion 3a as shown in the drawing, but also cuts in a U-shape from both end surfaces of the curved portion 3a, and the cutout portion is opened at the center of both end portions 3b and 3b. It may be formed by cutting in a U-shape from both end faces of the central portions of the both end portions 3b, 3b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connecting structure of a print lever and a print wire in a wire dot printer.

[0002]

[Prior Art]

 In the prior art, when connecting the print lever and the print wire, the end of the print lever is made to face the part to be connected of the print wire and is directly brazed to connect both. However, the structure of direct brazing cannot provide sufficient strength because the brazing area is small, which causes the joint to break during printing. Especially in recent years, as the number of dots has increased, wire diameters of 0.2 mm or less have been generally adopted, and the width of the tip of the print lever has become even wider. It is getting narrower. For this reason, the brazing work for connecting the two becomes extremely difficult, and the stress generated at the joint during printing also increases, increasing the fracture at the joint during printing and increasing the life of the print head. Making it short.

Therefore, in order to solve this problem, the applicant of the present application inserts a printing wire in the center of a reinforcing plate formed of a metal thin plate in a U shape, and the printing wire and the printing lever are formed together with the reinforcing plate. A structure for brazing (Japanese Patent Application No. 2-52086) is proposed.

[0004]

[Problems to be solved by the device]

 In the above-mentioned Japanese Patent Application No. 2-52086, when the printing wire and the printing lever are brazed in the reinforcing plate made of a U-shaped thin metal plate, the air in the reinforcing plate does not escape, and Bubbles may remain. Therefore, there is a problem that the strength of the joint cannot be increased sufficiently.

The purpose of the present invention is to prevent air bubbles from remaining in the reinforcing plate, to reliably increase the strength of the joint between the print lever and the print wire, to facilitate the brazing work, and to improve the longevity of the print head. Aim for

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the print lever and print wire coupling structure of the present invention is such that a print wire is inserted into the center of a U-shaped reinforcing plate made of a thin metal plate, and both ends of the reinforcing plate are the print lever. The tip of each of the abutments is in contact with at least both sides of the tip side of the printing wire, and the reinforcing plate has a notch at a position that does not affect the reinforcing strength. It is brazed.

[0007]

[Action]

 When the brazing material is poured into the notch of the reinforcing plate during brazing, internal air is expelled from the notch due to the invasion of the brazing filler metal, and the brazing wire is exposed around the printing wire and both sides of the tip of the printing lever. It spreads in the gap between them, and the above three parts are firmly bonded together without leaving any bubbles inside. The notch is provided at a position that does not affect the reinforcing strength of the reinforcing plate.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The present invention has a joining structure for joining the printing lever 1 and the printing wire 2 by brazing them with silver solder. As shown in FIG. 1, the print lever 1 is made of a material having an extremely small coercive force, has a central portion provided with an attracting portion 1a for an electromagnet disposed below, and has a left end portion as a fulcrum (not shown). It is free to move. The tip portion 1b at the right end portion is a brazing portion, and the width of the end surface of the tip portion is substantially the same as the diameter of the printing wire 2.

The printing wire 2 is made of a hard metal rod having a diameter of about 0.2 mm, and has an upper end portion that is a tip portion 2 a that moves up and down to form dots by the swing of the printing lever 1, and a rear portion of the lower end portion. The end portion 2b is a brazing portion joined to the tip portion 1b of the print lever 1.

As shown in FIG. 2, the reinforcing plate 3 is made by cutting a stainless thin plate having a thickness of about 0.1 mm into a rectangular shape, and is folded back into a semicircular shape at a central portion to form a curved portion 3 a. The part is extended so that both ends 3b, 3b face each other, whereby the cross-sectional shape is U-shaped. The reinforcing plate 3 is formed with a notch 3c at a position that does not affect the reinforcing strength. As shown in FIG. 7, the reinforcing plate is required to have a large reinforcing strength at the joint portion A between the print lever 1 and the print wire 2, but the central portion B of the other curved portion and most of both end portions. C and C are positions that do not affect the reinforcing strength. The notch is formed at a position that does not affect the reinforcing strength. In the example shown in FIGS. 1 and 2, the notch 3c is formed at the central portion B of the curved portion 3a.

The printing wire 2 is inserted in the center of the curved portion 3 a of the reinforcing plate 3, and both ends 3 b and 3 b of the reinforcing plate 3 are at least the printing wire 2 of the tip portion 1 b of the printing lever 1. Abut on both side surfaces on the tip 2a side.

In brazing, as shown in FIG. 3, a brazing material is formed between the end face side of the reinforcing plate 3 and the printing lever 1 and the printing wire 2, and between the both and the reinforcing plate 3. Pour 4 in. By the inflow of the brazing material 4, the air in the reinforcing plate 3 is expelled from the notch 3c and filled without leaving bubbles in the gap, and the space between the inside of the curved portion 3a of the reinforcing plate 3 and the print wire 2 is filled. , And between the inner surfaces of both end portions 3b, 3b of the reinforcing plate and both side surfaces of the tip portion 1b of the print lever 1 facing the inner surface of the reinforcing plate. The wax thickness firmly joins the three. Further, it flows into between the print lever 1 and the print wire 2 which are not covered with the reinforcing plate 3 to join them.

In the above example, a stainless steel plate having a thickness of 0.1 mm is used as the reinforcing plate, but other metal plates can be substituted and the plate thickness is not limited. Similarly, regarding the material and dimensions of the printing wire and the printing lever, any desired design can be selected.

Further, the cutout portion 3c is also formed in the curved portion 3a in the above example, but the present invention is not limited to this, and as shown in FIG. 4, the cutout portion 13c is formed at the center of both end portions 3b, 3b. As shown in FIG. 5, the reinforcing plate 13 that is opened, the reinforcing plate 23 in which the notches 23c and 23c are formed by cutting the both ends of the curved portion 3a in a U shape, and the both ends as shown in FIG. You may use the reinforcement plate 33 etc. which opened the notch part 33c ... by cutting in both ends of the center part of the parts 3b and 3b in U shape.

[0015]

[Effect of the device]

 As described above, according to the present invention, since the notch is formed at a position that does not affect the reinforcing strength of the U-shaped reinforcing plate, the inflow of brazing can be smoothed during brazing. Since the brazing work is easy and no air bubbles remain inside, reliable brazing is possible with a large area between the print lever and the printing wire, and the strength of the joint is surely strengthened. .. In addition, since the printing lever and the printing wire are covered by the reinforcing plate, the positioning of the printing wire is stable.In particular, by providing the reinforcing plate on the tip side of the printing wire, the strength of the part that receives the impact of the printing operation first increases, Breakage in the brazing part can be prevented, and the life of the print head is improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of the same reinforcing plate.

FIG. 3 is an enlarged sectional view illustrating a brazing operation.

FIG. 4 is an enlarged perspective view showing another embodiment of the reinforcing plate.

FIG. 5 is an enlarged perspective view showing still another embodiment of the reinforcing plate.

FIG. 6 is an enlarged perspective view showing still another embodiment of the reinforcing plate.

FIG. 7 is a perspective view for explaining reinforcing strength of a reinforcing plate.

[Explanation of symbols]

 1 Print Lever 1b Tip of Print Lever 2 Print Wire 2a Tip of Print Wire 3,13,23,33 Reinforcing Plate 3b Both Ends of Reinforcing Plate 3c, 13c, 23c, 33c Notch

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hiroshi Sato 4-1-1 Taihei, Sumida-ku, Tokyo Inside Seikosha Co., Ltd. (72) Yuji Nakagaki 4-1-1 Taihei, Sumida-ku, Tokyo Shares Inside the company Seikosha

Claims (1)

[Scope of utility model registration request] 1. A printing wire is inserted in the center of a U-shaped reinforcing plate made of a thin metal plate, and both ends of the reinforcing plate are at least on both sides of the tip of the printing lever at the tip of the printing wire. The notch is formed at a position that does not affect the reinforcing strength, and the printing wire and the printing lever are brazed together with the reinforcing plate. Print lever and print wire connection structure.