JPH0655745A - Printing head of dot impact-type printer - Google Patents

Abstract

PURPOSE:To prevent an armature and an armature receiving member from becoming abraded. CONSTITUTION:The subject dot impact-type printer is composed of an armature which allows one end part to be attracted by an excitation coil 1 and a printing wire 3 provided on the other end part to print data by hammering when energized, and an armature receiving member 4 which regulates a home position for the armature when deenergized. In addition, the printer is equipped with a bent part 5 for extending a contact area at a spot where the armature 2 comes in contact with the armature receiving member 4, and a damping member 6 at a spot where the armature receiving member 4 comes in contact with the bent part 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print head, and more particularly to a print head for a dot impact printer.

[0002]

2. Description of the Related Art A print head of a conventional dot impact printer will be described with reference to FIG. In this print head, the armature 12 has its one end attracted by the exciting coil 1 at the time of energization, with the fulcrum 7 fixed to a casing (not shown) as the center, and the print wire 3 provided on the other end not shown. The impact printing is performed via the ribbon. The armature receiving member 4 defines the returning position of the armature 12 by the spring force of the return spring 8 together with the stopper portion 15 of the armature 12 when the armature 12 is not energized. This print head has an exciting coil 1, a print wire 3, an armature 12, an armature receiving member 4 and a return spring 8 as one set of constituent elements. For example, the print wires 3 are arranged in two columns in a row, and 24 of these constituent elements are arranged. The sets are arranged radially.

[0003]

The stopper portion 15 of the armature 12 of the conventional print head described above has a thin plate thickness of about 0.2 mm, and has a small contact area with the armature receiving member 4. Therefore, when the stopper portion 15 and the armature receiving member 4 strike each other, the stopper portion 15 and the armature receiving member 4 are respectively worn away, and the return position of the armature 12 cannot be accurately defined, and the life of the print head is shortened. Become.

[0004]

A print head of a dot impact printer according to the present invention comprises an armature which is attracted to an exciting coil at one end when energized, and is printed on the other end of the print wire by striking printing. An armature receiving member that defines a return position of the armature is provided, and a bent portion for increasing a contact area is provided at a contact portion of the armature with the armature receiving member. In this structure, a cushioning member may be provided at a contact portion of the armature receiving member with the bent portion.

Further, the print head of the dot impact type printer of the present invention has an armature which is drawn by an exciting coil at one end when energized to perform striking printing on a print wire provided at the other end, and an armature which is not energized. An armature receiving member that defines a return position is provided, and a cushioning member is provided at a position where the armature receiving member abuts the armature.

[0006]

An embodiment of the present invention will be described with reference to the drawings. Referring to FIG. 1, in the print head of the dot impact printer of this embodiment, the armature 2 is attracted to the exciting coil 1 at one end thereof when energized, with a fulcrum 7 fixed to a casing (not shown) as the center. ,
On the other hand, the print wire 3 provided at the end is made to perform impact printing via a ribbon (not shown). The armature receiving member 4 defines the return position of the armature 2 by the spring force of the return spring 8 together with the bent portion 5 of the armature 2 when the armature 2 is not energized. The bent portion 5 is provided at the contact portion of the armature 2 with the armature receiving member 4 to increase the contact area and prevent wear. Further, a cushioning member 6 such as a film sheet is adhered to a contact portion of the armature receiving member 4 with the armature 2. This print head has an exciting coil 1, an armature 2, a print wire 3, an armature receiving member 4 and a return spring 8 as one set of constituent elements. For example, the print wires 3 are arranged in two columns and 24 of these constituent elements are arranged. The sets are arranged radially.

In the above embodiment, the armature 2 is provided with the bent portion 5 and the armature receiving member 4 is provided with the cushioning member 6 for the purpose of preventing wear, but the bent portion 5 of the armature 2 and the armature receiving member 4 are provided. This object can be achieved by providing any of the cushioning members 6 of the member 4.

[0008]

As described above, according to the present invention,
An armature receiving member of the armature is provided, which includes an armature for drawing a stroke on a print wire provided at the other end of the armature when one end is attracted by the excitation coil when energized, and an armature receiving member that defines the return position of the armature when not energized. By providing a bent part to increase the contact area at the contact part of the armature and a cushioning member at the contact part with the bent part of the armature receiving member, abrasion of the armature and the armature receiving member is prevented and the armature is returned. The position can be accurately defined, and the life of the print head is extended.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional example.

[Explanation of symbols]

 1 Excitation coil 2 Armature 3 Print wire 4 Armature receiving member 5 Bent portion 6 Buffer member 7 Support point 8 Return spring

Claims (3)

[Claims] 1. An armature that attracts one end to an exciting coil when energized to perform striking printing on a print wire provided at the other end, and an armature receiving member that defines a return position of the armature when deenergized, A print head for a dot impact type printer, characterized in that a bent portion for increasing a contact area is provided at a contact portion of the armature with the armature receiving member. 2. The print head of a dot impact type printer according to claim 1, wherein a buffer member is provided at a position where the armature receiving member comes into contact with the bent portion. 3. An armature, which has one end thereof attracted by an exciting coil when energized to perform striking printing on a print wire provided at the other end, and an armature receiving member which defines a return position of the armature when not energized, A print head for a dot impact type printer, wherein a buffer member is provided at a position where the armature receiving member comes into contact with the armature.