JPH02175159A - Printing head - Google Patents

Abstract

PURPOSE:To lower stress exerted to a print wire and to reduce cost of the wire material and to relax the condition and controlling for soldering and to enhance reliability by connecting the print wire to an armature via a plate spring. CONSTITUTION:In a solenoid clapper type printing head having a plurality of electromagnetic actuators contg. a yoke 2, an armature 5 and a coil, the armature 5 and the print wire 15 are connected via a plate spring 17. In such a way, stress exerted to the print wire 15 can be lowered by absorbing impact force concentrated to the print wire 15 by deflection of the plate spring 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer, and particularly to a print head for a dot matrix printer that prints by selectively impacting a recording medium with a print wire.

[Conventional technology]

FIG. 3 is a diagram showing the structure of the print head. A plurality of reciprocating print wires 15 and several guide cases 7 to 10 for guiding the print wires are stacked and housed in a cylindrical head frame l.

It is pressed and fixed to the left by a positioning guide spring 12. The drive unit that reciprocates the plurality of printed wires 15 has a plurality of magnetic coils 14 disposed on the circumference of the yoke 2 and the ring yoke 3 to form a magnetic circuit.
An armature 5 is provided facing the magnetic coil 14 and the yoke suction surface 2a. These armatures 5
has one end pressed against the ring yoke 3 by a hold spring 11, and the pressed end is guided and positioned by the armature support 4.

The armature sustainer 5 is rotatable between the stopper plate 1G and the yoke suction surface 2a. Further, a spring 13 is provided adjacent to the magnetic coil 14 and having one end in contact with the armature 5, and these springs 13 press the armature 5 against the stopper plate 16.

On the other hand, the printed wire 15 is fixed to the rotating end of the armature 5. The tips of the printed wires 15 are connected to the guide holes 7a-1 of the guide cases 7 to 10 stored stacked in the head frame 1.
The guide hole 6a provided in the main guide 6 is inserted through the guide hole 6a through the main guide 6 to be held. Here, the direction in which the printed wires are arranged is their fine direction and the armature 5.
This is a direction that almost coincides with the rotating direction of the rotating end.

In such a structure, when the magnetic coil 14 is selectively energized, the magnetic coil 14 emits magnetic force, and at this time, the armature 5 has an end pressed by the leaf spring 11 as the center, and an opposite end of the armature 5. At the same time, the print wire 15 is also driven and advanced, and the tip of the print wire 15 prints in a predetermined manner. After printing, the armature 5 is returned to the initial position together with the print wire 15 by the spring 13 as the magnetic coil is de-energized. The initial position here refers to a position where the rotating end of the armature 5 is pressed against the stopper plate 16.

[Problem to be solved by the invention]

In the conventional solenoid clapper type print head described above, the armature is attracted by applying a current to a coil inserted in the yoke, and the print wire brazed to the armature selectively prints on the recording medium. At this time, the impact force during printing is applied to the brazed portion 18 of the armature 5 and print wire 15, as shown in FIGS.
By working intensively, the wire root will break.

Here, brazing reduces the stress applied to the wire so that the wire does not break at the base, so the wire material, length,
Conditions such as the amount of deflection and brazing conditions are very strict, the cost of wire materials is high, and brazing conditions must be thoroughly controlled, making it very difficult to ensure quality and workability.

An object of the present invention is to provide a print head that solves the above problems.

[Means to solve the problem]

To achieve the above object, the present invention provides a solenoid clapper type print head having a plurality of electromagnetic actuators including a yoke, an armature, and a coil. They are connected via a leaf spring that absorbs the

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIGS. 1(a), (b), and (c) are diagrams showing one embodiment of the present invention.

Conventionally, the armature 5 and print wire 15 were directly brazed together as shown in Figures 2 (a) and (b)'t (c), and the impact force when printing in a predetermined method was reduced by brazing. Since the work was concentrated on the printed wire 15, the soldering of the printed wire 15 was prone to breakage at the portion 18.

Therefore, one aspect of the present invention is the armature 5 and printed wire 15.
According to the present invention, the impact force concentrated on the printed wire 15 is absorbed by the deflection of the printed wire 15, so that the printed wire 1
5 can be reduced.

〔Effect of the invention〕

As explained above, the present invention absorbs the impact force concentrated on the printed wire by the deflection of the leaf spring.
The stress on the printed wire can be reduced,
Reducing the cost of wire materials and brazing them has the effect of easing condition management and improving reliability.

[Brief explanation of the drawing]

FIG. 1(a) is a plan view showing one embodiment of the present invention, FIG. 1(b)
is a front view of the same, (c) is a side view of the same, FIG. 2 (a) is a plan view showing the conventional armature shape, (b) is a front view of the same, (
c) is the same side view, and FIG. 3 is a sectional view showing the structure of the print head. 1...Head frame 2...Yoke 2a...
・Yoke suction surface 3...Ring yoke 4...
Armature support 5... Armature 6... Main guide 6a, 7a-10a... Guide holes 7-10... Guide case 11... Hold spring 12... Guide spring 13... Return spring 14...・Magnetic coil 15・
...Printed wire 16...Stopper plate 1
7... Leaf spring 18... Brazed part

Claims (1)

[Claims] (1) In a solenoid clapper type print head that has a plurality of electromagnetic actuators including a yoke, an armature, and a coil, the armature of the electromagnetic actuator and the print wire of the print head are connected via a leaf spring that absorbs the impact force applied to the print wire. A print head characterized by being connected together.