JPH04140149A - Printing head for wire dot printer - Google Patents

Abstract

PURPOSE:To prevent the expansion of microcracks and flaws on the cut surfaces of a beam, which is caused by a striking force, by providing bent sections at the side edges of the beam at a predetermined angle with respect to the movement direction of a wire dot pin. CONSTITUTION:A beam 1 is made of a flat steel sheet, for example, a stainless steel sheet, having a thickness 't' of about 0.14mm, and a wire dot pin 11 is brazed on the upper part of the beam. A bent section 2 is respectively provided at both side edges of the flat steel sheet of this beam 1 at a predetermined angle. The width W of each of the bent sections 2 is, for example, about 0.3mm or so. Since the cut surfaces 15 of the beam 1 have a predetermined angle with respect to the wire dot pin 11, the cut surfaces are not arrayed in the movement direction of the wire dot pin 11. Accordingly, a striking force is not directly applied to microcracks and flaws on the cut surfaces.

Description

[Detailed Description of the Invention] [Summary] Regarding the structure of a print head for a wire dot printer, the purpose is to increase the durability of the beam of the striking part in particular, and a wire dot pin is provided at the tip of the armature via the beam, A print head for a wire dot printer that performs printing by driving the wire dot pin is characterized in that a bent portion is provided at the side edge of the beam at an angle with the operating direction of the wire dot pin.

[Industrial application field]

The present invention relates to the structure of a print head for a wire dot printer device.

2. Description of the Related Art In recent years, printer devices that print characters and the like using dots have become popular in input/output terminals of data processing devices, word processors, and the like. As the amount of printing and printing speed increases, the usage time increases, and there is a demand for a print head for wire dot printers that can withstand long-term use.

[Conventional technology]

A block diagram of a conventional print head for a wire dot printer is schematically shown in FIG.

1 is a beam, 10 is an armature, 11 is a wire dot pin, 13 and 14 are levers, and 135 and 14S are thin plate springs.

The levers 13.14 are made of piezoelectric elements, for example piezo elements. The levers 13 and 14 are composed of two pieces, one on top and one on top. A thin plate spring 133 is connected to the lever 13.
A thin plate spring 14S is connected to the lever 14, and the armature 10 is connected to the other ends of the thin plate springs 13S and 143. A beam 1 and a wire dot pin 11 are fixed to an armature 10. The beam 1 is made of a flat steel plate, and its thickness surface is oriented in the same direction as the direction in which the wire dot pin 11 moves. Also, in order to reduce the mass when the beam 1 operates and improve high-speed response, a part of the steel plate surface is cut out in a circular shape.

In such a configuration, applying a voltage to the levers 13, 14 causes them to extend and retract due to the Viez effect. In this case, in order to magnify the small movements of the levers 13, 14, the levers 13, 14 are mounted with opposite polarity so that their movements move in opposite directions. The movement of the two levers 13 and 14 is controlled by the thin plate spring 1.
3S.

14S to armature 10 and beam 1.

As a result, the wire dot pin 11 connected to the beam 1 moves back and forth, and the wire dot pin 11 hits a printing ribbon (not shown) and printing paper to perform printing.

(Problems to be Solved by the Invention) The print head of the above-described wire dot printer receives an impact force on the longitudinal cut surface of the beam each time the wire dot pin hits the printing paper and prints. Since the beam is pressed, it is normal for there to be very small microcracks or scratches on the cut surface due to the pressing. This damage spread due to repeated blows, and the problem was that the beam would eventually break due to fatigue at the damaged area.

SUMMARY OF THE INVENTION An object of the present invention is to provide a print head for a wire dot printer that has a long life and does not undergo fatigue damage due to microcracks or scratches even after repeated blows.

[Means for solving problems]

In order to achieve the above object, in a print head for a wire dot printer, which is equipped with a wire dot pin at the tip of an armature via a beam, and which drives the armature to print, the movement direction of the wire dot pin is attached to the side edge of the beam. It is possible to provide a print head for a wire dot printer characterized by having a structure in which a bent portion having an angle is provided.

[For production]

As described above, by providing a bent portion at an angle with the operating direction of the wire dot pin on the side edge of the beam of the print head for a wire dot printer according to the present invention, a direct impact force can be applied to the microcranks and scratches on the cut surface. I won't be able to join.

[Example] Hereinafter, an example of the print head for a printer according to the present invention will be described. FIG. 1 is a perspective view showing a beam shape diagram according to the present invention, where 1 is a beam, 2 is a bent portion, 11 is a wire dot pin, 15 is a cut surface portion, t is a plate thickness, and W is a width. .

As is clear from FIG. 1, the beam 1 is a flat steel plate, for example, made of stainless steel, with a thickness W of approximately 0.141 mm, and a wire dot pin 11 is brazed to the top thereof. A feature of the present invention is that bent portions 2 having a predetermined angle are provided on both side edges of the flat steel plate of the beam l. The width W of the bent portion 20 is, for example, approximately 0.3 mm. Cut section 15 of beam 1
Since the wire dot pin 11 has a predetermined angle with respect to the wire dot pin 11, the cutting surface portion is not placed in the direction of movement of the wire dot pin 11.

[Effects of the Invention] As explained above, according to the present invention, a bent portion having an angle with the operating direction of the wire dot pin is provided on the side edge of the beam of the print head for a wire dot printer, and the direction of the cut surface is changed by applying an impact. Since it has a shape that escapes from the direction, micro cranks and scratches on the cut surface will not spread due to the impact force. As a result, fatigue failure of the beam is eliminated, thereby increasing the durability of the print head for wire dot printers and achieving a longer life.

[Brief explanation of drawings]

FIG. 1 is a beam shape diagram according to the present invention, and FIG. 2 is a configuration diagram of a conventional print head for a wire dot printer. In the figure, 1 is the beam, 2 is the bent part, 10 is the armature, 11 is the wire dot pin, 13 and 14 are the levers 3S and 145 are the thin plate springs, 5 is the cut surface, t is the plate thickness, and W is the width, respectively. show. 11 Wire dot pin

Claims (1)

[Claims] A wire dot pin (11) is provided at the tip of the armature (10) via a beam (1),
In the print head for a wire dot printer that prints by driving the wire dot pin (1), the beam (1) is provided with a bent portion (2) on the side edge thereof at an angle with the operating direction of the wire dot pin (11). A print head for wire dot printers that is characterized by: