JPS6410344B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing hammer tip guide device.

Conventionally, printing hammers, like printing wires, have been used to correctly align the tip positions by passing the sharp tips for printing through holes provided in a guide plate. However, if the printing hammer is plate-shaped, supported at one end, the printing tip is concentrated toward the center, and prints by moving parallel to the plate surface, the printing hammer itself Because of the problem of lateral wobbling, it has been difficult to obtain high-quality printing with the conventional guide plate described above. Furthermore, in the conventional example described above, a guide plate is not incorporated when assembling the printer head, so
The printing hammer had to be held at the correct tip position using a separate jig, and the assembly work was complicated.

In the present invention, the plate-shaped surface on the back side of the tip of the printing hammer is configured to be guided by a cylindrical guide pin, which prevents horizontal wobbling of the printing hammer and aligns the tip of the hammer. To provide a printing hammer tip guide device that does not require any jig and is easy to work with.

An embodiment of the present invention will be described with reference to the drawings. As shown in the first and second figures, the printing hammer 1... has a thin plate shape, and one end thereof is held in a hammer holder 2... which serves as a movable yoke, and the other end is a projection 1a for printing. It has the following.

The printing hammer 1... is held by a hammer holder 2..., and the hammer holder is fixed to a leaf spring 3 by aligning them so that they are converged so that the projections 1a are located at a predetermined position near the center. . The leaf spring 3 has eight arm portions 3a extending from the ring-shaped outer periphery toward the center.
is extended, and each hammer holder 2 is fixed to the hole provided at the tip of each arm. The leaf spring 3 is fixed to a front yoke plate 4 formed by stacking three thin plates through a spacer 5, as shown in the second figure. The front yoke plate 4 has a through hole 6 into which the hammer holder 2 fits, and faces the front end of the center yoke 7 located behind the hole 6, and magnetically resists the spring force of the leaf spring 3. is attracted to the yoke and operates as a movable yoke. A guide body mounting hole 8 is bored in the center of the front yoke plate 4. The guide body 9 shown in the third figure is attached to this attachment hole.

The guide body 9 has eight cylindrical guide pins 10 erected on a mounting base 9a, and the gap between each guide pin is made approximately equal to the plate thickness of the printing hammer 1... These are located in each gap at the tip of the printing hammer. Although it is made slightly wider than the plate thickness to minimize sliding friction, it is sufficient to prevent horizontal wobbling of the printing hammer. The guide body 9 has its mounting base 9a first and second.
As shown in the figure, the guide pins 10 are fitted and fixed in the mounting holes 8 of the front yoke plate 4, but the guide pins 10 can also be directly implanted in the front yoke plate 4 without providing the mounting holes 8 and the mounting bases 9a. good. Printing hammer 1 in the gap between adjacent guide pins 10...
The tip of... is inserted, and the tip is positioned and at the same time prevents sideways movement.

When assembling, the guide body 9 is fixed in the mounting hole 8 of the front yoke plate 4, the printing hammer 1... is swingably connected to the hammer holder 2... with the connecting pin 11, and the hammer holder is attached to the plate spring. 3 each arm part 3
Loosely fit into the hole at the tip of a... from behind,
The rear ends of the hammer holders 2 are fitted into the through holes 6 of the front yoke plate 4, and the leaf springs 3 are fixed to the front surface of the front yoke plate via the spacers 5. The printing hammer 1 is tilted at right angles to the axial direction of the hammer holder, and its tip is inserted into each gap between the guide pins 10 . Hammer holder 2... is arm part 3
The tip of each printing hammer rotates in the hole a so that it is correctly inserted into the gap between the guide pins without any force.
Thereafter, the printing hammer 1 . . . and the hammer holder 2 . . . and the leaf spring 3 . When the guide body 9 is assembled, the printing hammer 1...
It serves to hold the tip of the printing hammer in the correct position, and after assembly, it also serves as a guide to prevent the printing hammer from wobbling laterally. When the printing hammer is driven parallel to the plate surface direction, the guide pin 10 is close to the plate surface, but even if the cylindrical guide pin and the plate surface of the printing hammer come into contact, they are in line contact;
Sliding friction is extremely small.

As described above, according to the present invention, by guiding the plate surface on the back side of the tip of the plate-shaped printing hammer with the cylindrical guide pin, the surface of the tip to be printed can be correctly aligned in a predetermined position, and printing can be performed. The hammer moves in a direction parallel to the board surface to prevent horizontal wobbling when printing, resulting in good printing quality. Furthermore, even if the printing hammer touches the cylindrical guide pin during printing, the contact area is small, so sliding friction is small, and loss of drive energy is extremely small. In addition, since there is no horizontal wobbling, there is no possibility of the printing hammer coming off at the joint or bending the printing hammer. Furthermore, when assembling the printing hammer, there is no need for a jig to keep the tip of the printing hammer in a predetermined position, and there are excellent effects such as ease of assembly.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway front view, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. 3 is a perspective view of the guide body. 1... Printing hammer, 2... Hammer holder, 9...
...Guide body, 10...Guide pin.

Claims (1)

[Claims] 1. It has a plate shape, is supported at one end thereof, and is arranged so that printing is performed by moving parallel to the plate surface, and the tip thereof is in a focused state. A guide body having a plurality of printing hammers, a plurality of cylindrical guide pins standing upright, and a guide body capable of inserting the back side of the tip of the printing hammer into the gap between adjacent guide pins. A printing hammer tip guide device featuring: