JPH0444373Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is based on an impact printing head, especially a plurality of printing units that print dots by enlarging and transmitting the dimensional distortion generated by the electrostrictive element to the printing wire to the printing wire. This invention relates to an assembled and configured impact print head.

[Conventional technology]

Conventionally, an impact printing head has been proposed that uses a dot printing element whose driving source is an actuator that utilizes the electrostrictive longitudinal effect of a ceramic material, and is constructed by assembling a plurality of these printing elements. (For example, the impact printing head described in Japanese Patent Application No. 58-139039). In conventional impact printing heads, each printing element has multiple holes for passing screws for assembly and fixing, and each printing element is stacked on top of the head stand with a spacer interposed between them, and then the screws are inserted into each printing element. It is constructed by passing it through the hole in the element and securing it with a screw.

FIG. 2 is an exploded perspective view of a conventional printhead as described above. The printing unit 1 is provided with screw holes 10A to 10C for passing screws 8A to 8C for assembly and fixation, respectively. head stand 2
A wire guide 5 for guiding the printing wire 12 to the printing surface is provided at the tip. Further, the head stand 2 is provided with screw holes 20 (six locations) at each location of an integrally provided spacer for positioning the lowermost printing element 1. That is, two sets of printing elements 1 are stacked on the head stand 2. When stacking each set, first print element 1 at the bottom, as shown in the figure.
The wire 12 attached to the lever 11 at the tip of
through the lowermost guide hole of the wire guide 5,
Align the screw holes 10A to 10C with the screw hole 20. Next, pass the tips of the screws 8A to 8C through each screw hole 20, and then through the screw holes 10A to 10C,
Further, as shown by arrows A to C, spacers 7A to 7
Pass it through the holes provided in C. Thereafter, in the same manner, the second and subsequent printing elements are stacked with spacers 7A to 7C interposed therebetween.
A screw hole is provided at the tip of each of the screws 8A to 8C, and after each set of printing elements 1 is stacked, a fixing screw is tightened into the screw hole from above to attach the stacked printing elements to the head. Fix it on stand 2.

[Problem that the invention attempts to solve]

The above-described conventional impact printing head has a problem in that when the printing elements 1 are stacked and assembled, it takes time to determine the orientation of the printing elements 1, and a large number of manufacturing steps are required.

That is, since the distance between the wires 12 at the tip of the wire guide 5 is considerably smaller than the thickness of the printing elements 1, it is necessary to stack the printing elements 1 so that they form a fan shape when viewed from the side. . For this reason, the thickness of the spacers 7A to 7C is tapered to provide a required angle between the printing elements 1, and the screws 8A to 8
C is a round bar with the required curvature. However, as mentioned above, when passing the screws 8A to 8C while stacking the printing units 1, the screw 8A
The direction of bending of the wires 1 to 8C is likely to change, and this causes a misalignment of the printing unit 1, so extra man-hours are required to align the ends of the wires 12.

An object of the present invention is to provide an impact printing head which solves the above-mentioned problems and requires fewer man-hours during assembly than conventional ones.

[Means for solving problems]

The printing head of the present invention is an impact printing head having a structure in which a plurality of electrostrictive printing elements are stacked with spacers interposed therebetween and fixed by passing screws into a plurality of holes provided to penetrate the printing elements and the spacers. At least two of the plurality of screws have polygonal cross-sections, and have one end on the same side connected to each other so as to be integrated, and each other end of the integrated screw is connected to the other end of the screw. The hole for passing has the polygonal cross section so as to fit and pass the screw therethrough.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is an exploded perspective view showing one embodiment of the present invention. This embodiment shows a case in which two sets of printing elements 1 are stacked and assembled on a head stand 2, similar to the conventional printing head shown in FIG. In this embodiment, a screw having an integrated structure in which four screws 9A, 9B, 9D, and 9E are provided on a screw base 9 is used. The screws 9A and 9B are respectively screwed into the screw holes 10A of the printing element 1 of the front side of the two sets.
and 10B, and screws 9D and 9E are placed above the same holes 20D and 20E provided in the head stand 2. Pass it through the screw hole of the other set of printing elements (not shown) (arrow D
and E) is a screw. Screws 9A passed through screw holes 10A and 10B of printing element 1, respectively
and 9B are passed through the holes of the spacers 7A and 7B (arrows A and B), and then the printing elements (not shown) placed above are passed through the screw holes to stack the printing elements.

The screws 9A, 9B, 9D and 9E are respectively
As in the conventional case, it has a predetermined curvature and a screw hole for fixing a screw is provided at each tip, but each cross section is formed into a rectangle. The screw hole 10A is made so that each screw of this rectangular cross section can be fitted and passed through.
and 10B, the holes of spacers 7A and 7B,
The screw holes 20D and 20E are each formed into a rectangular cross section.

By forming a structure in which a plurality of screws are integrated in this manner, when the printing elements 1 are stacked and threaded through the screws, it is possible to prevent the direction of bending of the screws from changing as in the conventional case. Furthermore, the cross section of each screw having an integrated structure is made rectangular, and the cross section of the holes provided in each part for passing the screws is also formed into a rectangular shape so that each screw can fit and pass through. Directional deviation during stacking and assembly can be completely prevented.

The remaining screws, that is, the screws (arrow C) passing through the screw hole 10C and the screws passing through the screw hole 20F, may be individual screws as in the conventional case.

In this example, four screws are integrated,
Although a case has been shown in which two sets of printing elements are used in each set when stacking and assembling them, the present invention is not limited to this. For example, it is clear that even if two screws are integrated and a set of printing elements is assembled using this, the printing elements can be prevented from shifting in direction.

[Effects of the Invention] As explained above, the present invention has the effect of realizing an impact printing head that requires fewer man-hours during assembly than the conventional one.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
FIG. 2 is an exploded perspective view of a conventional impact print head. 1... Printing unit, 10A to 10C, 20,
20D~20F...Screw hole, 2...Head stand, 1
2... Wire, 5... Wire guide, 7A to 7C
...Spacer, 8A to 8C, 9A, 9B, 9D,
9E...Screw, 9...Screw stand.

Claims (1)

[Claims for Utility Model Registration] Impact printing having a structure in which a plurality of electrostrictive printing elements are stacked with spacers interposed therebetween and fixed by passing screws into a plurality of holes provided to penetrate the printing elements and the spacers respectively. In the head, at least two of the plurality of screws have polygonal cross-sections, and each end on the same side is connected to each other so as to be integrated, and each other end of the integrated screw is connected to each other. An impact printing head characterized in that the hole for passing the screw has the polygonal cross section so as to fit and pass through the screw.