JPS604789B2 - Clapper type wire dot print head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a clapper type wire dot print head.
This is related to this.

Conventionally, in this type of structure, the fulcrum of the clapper was supported with some play.

For this reason, when the clapper was operated, the fulcrum part wobbled. Furthermore, when trying to eliminate play, the fulcrum part is often pressed down too much, resulting in unstable operation, so the play at the clapper fulcrum must be strictly controlled when standing upright. In addition, conventionally, coil springs were used for each clapper to bias the clapper to its standby position.
At the fulcrum of the clapper, it is necessary to position the clapper, and a means for regulating the direction of movement of the clapper is required so that the tip of the clapper always remains in engagement with the tip of the wire.

For this reason, the number of component parts is large, the structure is complicated and assembly is difficult, and energy loss due to friction is large.

The present invention has been made in an attempt to solve such problems, and the clapper is fixed to the free end of a cantilever beam having spring properties, and is biased toward the standby position by the moment generated at the free end of the cantilever beam. The clubber has a structure in which the fulcrum is held in close contact with a spring member such as a coil spring or a leaf spring with a constant pressure.

An object of the present invention is to provide a dot printer head that has fewer components and is easy to assemble.

Another object of the present invention is to provide a Dodd presotho head with low energy loss. The present invention will be explained in detail below based on the drawings. First, an embodiment of the present invention will be described.
This will be explained using FIG. FIG. 1 is a sectional view showing an embodiment of the dot print head of the present invention, and FIG. 3 is an exploded view thereof. 1 is a frame, 2 is a printed wire, 3 is a drive coil, 4 is a coil core, and 5 is a plunger, which is integrated with a clapper 6. printed wire 2
is returned to the non-printing direction by a print wire return spring 01, and is positioned by a dowel 8 fixed to the clapper presser cover 7. 9 is a fulcrum presser spring, and A is a clapper fulcrum.

A plurality of clappers 6 are formed into cantilever beams 1 having spring properties by a crimping pin 12 and a plunger 5 which also serves as a crimping piece.
It is fixed at 1. The cantilever beam 11 is also a leaf spring with a plurality of branches extending radially, as shown in FIG. Insert 8 per degree into 1 and attach clapper presser lid 7
Fixed. The cantilever beam 11 is given a deflection by the fulcrum presser spring 9, and the moment about the fulcrum A causes the clapper 6 to return to the non-printing direction, that is, to the standby position. Next, the operation will be explained.

When the drive coil 3 is energized, the clapper 6 is attracted together with the plunger 5 about the fulcrum A. Clapper-6
rotates clockwise around fulcrum A. One end of the clapper 6 is engaged with the end of the print wire 2, and the print wire 2 operates against the spring force of the print wire return spring 10 to print. In this series of operations, if there is any play in the fulcrum A of the clapper 6, the clapper 6 will rotate counterclockwise around the print wire side by the amount of play, but this rotation will reduce the actual stroke of the clapper 6, causing the printing It is completely wasted during operation. According to the structure of the present invention, the backlash of the fulcrum A is eliminated by adding the fulcrum presser spring 9. Therefore, there is an effect that the above-mentioned waste is eliminated and the stroke is not actually reduced. Furthermore, because it is a spring club, it does not hold down too much. It can be supported with an appropriate load. FIG. 2 is a perspective view of a dot head according to the present invention, and FIG. 3 is an exploded view thereof.

FIG. 4 shows another embodiment of the invention.

In FIG. 4, the fulcrum presser of the clapper 6 is a leaf spring. That is, the same effect as described above can be obtained by the fulcrum presser spring 15. As described above, according to the present invention, waste during the operation of the clapper is eliminated, the energy of the drive coil is efficiently transmitted to the clapper, and there is no need to manage play dimensions after assembly, and assembly is significantly simplified. . In addition, by urging the clapper to the standby position with the moment generated at the free end of the leaf spring, there is no need to provide a means for positioning the clapper or a means for regulating the direction of movement of the clapper, unlike in conventional clapper-type dot heads, and structural parts are not required. This makes it possible to create a clapper-type dot head with fewer points, easy assembly, and almost no energy loss due to friction.
In this way, the present invention can provide a wire dot print head with improved performance and ease of assembly and reduced costs, and its effects are very large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention. FIG. 2 is a perspective view of a dot head according to the present invention. FIG. 3 is an exploded view of a dot head according to the present invention. FIG. 4 is a sectional view showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Frame, 2... Print wire, 3... Drive coil, 4... Coil core, 5... Plunger, 6... Clapper, 7... Clapper presser cover, 8・・・・・・Per degree, 9,
15...Fully point presser spring, 10...Printed wire return spring. Figure 1 Figure 2 Figure 4 Figure 3

Claims (1)

[Scope of Claims] 1. A clapper that is driven by an electromagnet and rotates about one end as a fulcrum, a printed wire that engages with the other end of the clapper, and a cantilever having a spring property, the cantilever being In a clapper-type wire dot print head, the free end of the clapper and the fulcrum end of the clapper are fixed, and the cantilever is arranged to be deflected so as to bias the clapper toward a standby position. A clapper-type wire dot print head characterized in that the crumple fulcrum end is pressed by a spring so as to provide deflection and abut against a fulcrum support member of the clapper. 2. The cantilever beam has a plurality of branches extending radially, the free ends of each branch being fixed to the claspper, and the central part serving as a fixed part. Clapper type wire dot print head as described.