JPS5836543Y2 - Armature support structure of printing magnet - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an armature support structure for a printing magnet in an impact type dot printer or the like.

Figure 1 shows an example of a printing magnet in a conventional impact-type dot printer. In particular, the armature fixed to a leaf spring is attracted by a permanent magnet, and during printing, the magnetic field of this permanent magnet is canceled out, and the leaf spring is restored. It shows a free printing type printing magnet that uses force to drive the printing wire.

In the figure, 1 is a permanent magnet for attracting the armature 2 to the rest position, 3 is a core that constitutes the magnetic path of the permanent magnet 1 and has a degaussing coil 4 wound around a part thereof, 5
1 is a leaf spring that supports the armature 2; 6 and 7 are yokes that sandwich the terminal ends of the leaf spring 5 and form part of a magnetic path; and 8 is a printing wire.

FIG. 2 is an enlarged sectional view showing the vicinity of the suction part of the printing magnet, in which the part of the yoke 7 facing the core 3 is retracted in the direction in which the armature 2 is released, and in the rest state, the armature 2 is attached to the permanent magnet 1. It is attracted to the core 3 by the magnetic force as shown in the figure.

During the printing operation, the degaussing coil 4 is energized and the magnetic field produced by the permanent magnet 1 is canceled out.

The armature 2 is moved to the core 3 by the restoring force of the bent leaf spring 5.
, and drives the print wire 8 forward.

In such conventional printing magnets, armature 2
The connection between the plate spring 5 and the plate spring 5 is carried out by tightening, brazing, spot welding, etc., but the armature 2 is attracted to the core 3 due to warping of the plate spring itself, warping due to the squeezing pressure, or thermal deformation due to heating. The amount of deflection of the leaf spring 5 varies during printing, making it difficult to keep the printing pressure within a certain range.

The present invention provides an armature support structure that can minimize variation in the amount of deflection of the leaf spring that supports the armature and obtain printing pressure within a certain range.

The present invention will be explained below with reference to the drawings.

FIG. 3 is a diagram showing an embodiment of the present invention, in which the same components as in FIG. 1 are designated by the same numbers.

In FIG. 3, the armature 2 is fixed to a leaf spring 5, which is fixed to a support yoke 9 provided between the yokes 6 and 7.

A groove 2a is provided on the support end surface of the armature 2, as shown in FIG. 4, and a similar groove is provided on the inner surface (armature side) of the support yoke 9.

The method of fixing the leaf spring 5 to the armature 2 and support yoke 9 is to insert silver solder 10 into each groove of the armature 2 and support yoke 9, which have been positioned in advance, as shown in FIG. 5 is inserted with a suitable gap maintained, and then the silver solder 10 is melted.

As a result, the armature 2, leaf spring 5 and support yoke 9 are integrally coupled as shown in FIG.

In this way, in the armature support structure of the present invention,
When connecting the armature 2 and the leaf spring 5 or the yoke 9 and the leaf spring 5, there is no need to apply mechanical deformation force to the leaf spring 5, and the degree of heating is lower than before because the ends are simply soldered with silver. .

Therefore, the leaf spring 5 is fixed without being subjected to mechanical deformation or thermal deformation, and the variation in the amount of deflection during suction is reduced accordingly.

In addition, since there is room for both ends of the leaf spring 5 to move freely within the respective grooves of the armature 2 and the support I-yoke 9, warping of the spring itself when it is fixed and thermal deformation due to silver brazing is absorbed by this room. , it becomes easier to accurately produce the required amount of deflection.

Furthermore, by providing the grooves in each of the armature 2 and the support yoke 9, a certain amount of silver solder 10 of a certain shape can be placed in the grooves in advance, which facilitates manufacturing and reduces the amount of silver at the joint. The filling amount of wax becomes constant, suppressing variations in spring span, and making the spring constant uniform.

As described above, according to the present invention, variations in the amount of deflection of the leaf spring supported by the armature are suppressed to a minimum, and printing pressure is made uniform.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams showing the structure of a conventional printing magnet, Figure 3 is a diagram showing the structure of a printing magnet according to the present invention, and Figure 4 is an explanatory diagram of a part of the fixing method in Figure 3. , FIG. 5 is a diagram showing the armature support structure of the present invention. 2... Armature, 5... Leaf spring,
9...Support yoke, 10...Silver wax.

Claims (1)

[Scope of utility model registration request] In an armature support structure in which the armature of a printing magnet in a printer or the like is supported by a plate spring, a groove in which the plate spring is loosely fitted between the inner surface of the yoke that forms part of the magnetic path of the printing magnet and the support end surface of the armature. An armature support structure for a printing magnet, characterized in that both ends of an armature support leaf spring are inserted into each groove and fixed by silver soldering.