JPS60255454A - Dot impact printing head fixing apparatus - Google Patents

Abstract

PURPOSE:To obtain the titled apparatus capable of simply obtaining the locating precision and further capable of dissolving the irregularity of printing density, by a method wherein the plate spring fixing surface of a support body is inclined to a yoke surface by a specific angle and the other end of the plate spring is fixed by inclining it to the yoke surface. CONSTITUTION:In the spring charged dot impact printing head in which an attracting mechanism part is composed of a magnet 2, a yoke 1 and a demagnetizing coil 4, one end of the plate spring 5 having a printing hammer 6 being attracted to the surface of the yoke 1 by the magnetic force of a magnet 2, the other end the part of the plate spring 5 being supported with a support body 3 at a position by a specific distance apart from the surface of yoke 1, and when current flows in the demagnetizing coil 4, one end of the plate spring 5 is released and the printing hammer 6 prints by impact with distortion energy, the titled apparatus is so constructed that the plate spring fixing surface 3a of support body 3 is inclined and the top end is attracted almost perpendicular to the yoke surface 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fixing device for a dot printer print head.

2. Description of the Related Art Conventionally, a print head section of a spring charge type dot printer has been shown in FIGS. 3 and 4. 1 is a comb-shaped yoke, and degaussing coils 4 are installed in the comb-shaped parts 1a, la...
, 4... are wound. 2 is a permanent magnet which is sandwiched between two yokes 1 and 1. comb-shaped tip 1b of the yoke;
1b... Printed hammer 6. Leaf spring 5 with 6...
, 5... are suctioned (adsorbed). The leaf springs 5 are integrally connected at their lower ends by a common substrate 8, and the substrate 8 is fixed to one end 3a of the U-shaped support 3 via a presser plate 7 and a fixing screw 10. The permanent magnet 2 is sandwiched between two yokes 1, 1, and is sealed and fixed inside one end of the support body 3, leaving the comb-shaped end of the yoke. At this time, in order to obtain a larger suction force, when the leaf springs 5, 5, . . . The yoke 1 is enclosed in an inclined manner as shown in FIG. 2 so that the two parts are parallel to each other.

Problems to be Solved by the Invention For this reason, it is difficult to obtain the fixing position accuracy of the yoke 1, and the fixing position 7 of the leaf spring 5 and the surface 1b of the yoke 1, which is attracted to the yoke tip 1b, are tilted by a predetermined angle. When the leaf spring is enclosed at an angle, the fixing accuracy is significantly lower than when the leaf spring is enclosed at a right angle, and the distance between the leaf springs is not constant. As a result, variations occur in the strain energy of the leaf springs, resulting in uneven printing density between the plate springs and the printing hammers 6, 6, . . . during impact printing.

The present invention has been proposed in view of the above, and since the suction surfaces of the leaf spring 5 and the yoke are made parallel to each other without tilting the yoke, the accuracy of the fixing position of the yoke can be easily achieved and uneven print density can be eliminated. The aim is to provide what is possible.

Means for Solving the Problems For this purpose, the present invention has a structure in which the fixing surface 3a of the leaf spring 5 of the support body 3 is inclined.

According to the present invention, by making a simple change of inclining the fixing surface of the leaf spring of the support body, the suction surface of the leaf spring and the yoke can be kept parallel without tilting the yoke, and the yoke can be easily fixed during encapsulation molding. It is possible to improve the accuracy of the fixing position.

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 shows an embodiment of the present invention, and is a sectional view corresponding to FIG. 4. In FIG. 1, the same parts as in FIG. 3.4 are designated by the same reference numerals, and their explanation will be omitted. The novel point is that instead of installing the yoke 1 at an angle, the upper end of the slanted plate spring fixing surface 3a of the support body 3 is attracted to the yoke surface 1b in a substantially perpendicular direction. Therefore, it is a yoke. This inclination angle θ is relative to the yoke surface 1b, and in the embodiment, the plate spring 5 may be attached to the yoke 1 so that the surface 1b is a vertical surface.

Effects of the Invention When the support is molded according to the present invention, the yoke surface can be mounted at right angles when the yoke is encapsulated, making it easier to achieve positional accuracy than in the past. It is easy to make it constant, and it becomes possible to eliminate uneven print density.

Modifications to the Embodiments Note that the present invention is not limited to the embodiments, and for example, as shown in FIG. It's okay to stay.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the invention, and FIG. 2 is a sectional view of another embodiment of the invention. FIG. 3 is a schematic diagram of a conventional printing mechanism. FIG. 4 is a sectional view of FIG. 3. 1 is a yoke, 2 is a permanent magnet, 3 is a support body, 3a is a plate spring fixing surface, 4 is a degaussing coil, 5 is a plate spring, 6 is a printing hammer, 7 is a plate spring, 8 is a common board for the plate springs, 10 is a fixing screw. patent applicant

Claims (1)

[Claims] A magnet, a yoke, and a degaussing coil constitute an attraction mechanism, one end of a plate spring having a printed hammer on the surface of the yoke is attracted by the magnetic force of the magnet, and the other end of the plate spring is held at a predetermined distance from the yoke surface. A spring that is supported by a support at a distance i, releases one end of the leaf spring from the yoke surface by passing a current through the degaussing coil, and causes the printing hammer to perform impact printing using strain energy generated in the leaf spring. In the charge dot impact print head, the plate spring fixing surface of the support body is inclined at a predetermined angle with respect to the yoke surface, and the other end of the plate spring is fixed at an angle with respect to the yoke surface. Fixed dot impact print head