JPS6241473B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire head driving device for a dot printer in which an electromagnet for driving the wire head is built into a case in a ring shape.

The wire head drive device of the dot printer is
Generally, an electromagnet is used as the drive source, but in conventional devices of this type, the armature's rotational fulcrum is located outside the electromagnet arranged in a ring, and the armature is connected to the electromagnetic core by energizing the electromagnetic coil. The wire head located inside the electromagnet was pushed and driven toward the platen by the rotating end of this armature, so the case for storing these was located further outside the electromagnet. It required a large device that could accommodate amateurs, which had the disadvantage of making the device large. In addition, in the conventional device, a yoke, a spring member for holding the armature, etc. were separately provided for each electromagnet, which also resulted in a large size and a complicated configuration with a large number of parts, making assembly difficult. Ta.

The present invention has been made based on the above circumstances, and its object is to provide a wire head drive device for a dot printer that is small, simple in structure, and easy to assemble.

Hereinafter, the configuration of the present invention will be explained based on illustrated embodiments. Fig. 1 shows the external appearance of the wire head drive device.A guide body 2 is connected to the outer surface of the bottom plate of a case 1 having a substantially bottomed cylindrical shape, and the open end of the case 1 is closed with a case cover 3. has been done. FIG. 2 shows each part disassembled. As shown in the figure, the yoke plate 4, electromagnetic coil 5, armature retaining plate 6, armature 7, leaf spring 8, etc. are successively assembled into the case 1. ing.

Guide pieces 2a to 2d are housed in the guide body 2, and a plurality of (for example, seven) wire heads 9 are inserted through these guide pieces 2a to 2d, and these heads 9 are connected to the platen 10. The opposing ends are arranged on a straight line at equal intervals, and the other ends are arranged on the same circle at equal intervals, and these wire heads 9 are forced to curve and are guided so as to move forward and backward. I have to. On the inner peripheral surface of the case 1, the same number of partition walls 11 as the wire heads 9 are provided at equal intervals and protrude toward the center. A through hole 12 is provided in the center of the bottom plate of the case 1, and the other ends of the wire heads 9 are introduced into the case 1 through the through hole 12. A contact body 13 is fixed to each other end of the wire head 9.
3 is inserted into a through hole of a cap-shaped stopper 14 attached to the terminal end of the guide body 2, as shown in FIG. 4, so that it can move forward and backward. A compression coil spring 15 for returning the wire head is inserted between each contact body 13 and the guide body 2.
As a result, each wire head 9 is always urged in a direction away from the platen 10, and the tip of the contact body 13 is made to protrude outward from the stopper 14. The yoke plate 4 is closely integrated into the inner bottom surface of the case 1, and has a through hole 16 in the center that overlaps the through hole 12 of the case 1, and the wire heads 9 are arranged around the through hole 16. The same number of suction pieces 17 are provided protrudingly. One end of each electromagnetic core 18 is fixed between each partition wall 11 at a position outside each suction piece 17 on the inner surface of this yoke plate 4, and the coil 5 is attached to the outer periphery of each core 18. The electromagnet 19 is configured by attaching the electromagnet 19.

On the other hand, the armature holding plate 6 has an annular shape,
The holding plate 6 is disposed at the open end of the case 1, and the same number of protrusions 6a as the wire heads 9 are provided on the inner periphery of the holding plate 6. Support grooves 6b are provided on both sides of the protrusion 6a, and the armature 7 is rotated by the mutually opposing support grooves 6b, 6b provided in the adjacent protrusions 6a, 6b. It is freely supported. That is,
One end 7a of the armature 7 is provided with a pair of left and right protrusions 7b, 7b.
are loosely fitted into the support grooves 6b, 6b, and the armature 7 rotates around the contact portion between the armature 7 and the electromagnet core 18, so that the other end of the armature 7 is brought into and out of contact with the absorbing piece 17. I have to. Then, when the intermediate portion 7d of the armature 7 is sucked by the suction piece 17 and the armature 7 rotates around the end 7a, the other end 7c presses the contact body 13, and the tip of each wire head 9 is attached to the platen 1.
It's starting to hit 0. The leaf spring 8 has an annular shape and is disposed in close contact with the outer surface of the armature holding plate 6 at the open end of the case 1. Further, a large number of protruding pieces 8a are provided on the inner periphery of the leaf spring 8, and these protruding pieces 8a elastically press the protrusions 7b, 7b of each armature 7 from the outside, so that the armature 7 is pushed into the support groove. I'm trying not to get out of 6b, 6b. Further, the holding plate 6 and the leaf spring 8 are held between the case 1 and the case cover 3 as shown in FIG. Therefore, the yoke plate 4, the electromagnetic coil 5, the armature retaining plate 6, the armature 7, and the leaf spring 8 are installed in the case.
are assembled one after another, and finally the case cover 3 is attached to integrate these components. A printed circuit board 20 shown in FIG. 2 is attached to the inner surface of the case cover 3, and a terminal portion 20a provided at one end of this printed circuit board 20 is connected by plugging into a suitable connector 21. There is.

In the wire head drive device configured as described above, when the electromagnetic coil 5 is not energized, the armature 7 is moved by the spring force of the spring 15 to the intermediate portion 7d as shown by the solid line in FIG.
is held at a position apart from the suction piece 17, but when the electromagnetic coil 5 is energized, the intermediate portion 7d of the armature 7 is attracted by the absorption piece 17,
The wire head 9 is rotated to the imaginary line position shown in FIG. 4, and the desired wire head 9 is pressed and driven.

As described above based on the embodiments, the wire head drive device of the present invention uses one end of the armature as a rotational fulcrum, and this end is positioned on the electromagnet core, and the armature is attached to the suction provided inside the electromagnet. Since the electromagnet is configured to be attracted by a piece, the case only needs to be the minimum size that can accommodate the electromagnet, and the entire device can be made compact. Furthermore, since the yoke plate 4, the armature holding plate 6, and the leaf spring 8 can be used in common for all electromagnets, the number of parts is small and the configuration is simple. Furthermore, the guide body can be attached to the case 1 from one side through the stopper 14, and the yoke plate 4, electromagnetic coil 5, armature retaining plate 6, armature 7, leaf spring 8, etc. can be sequentially assembled from the other side. can be assembled into. Furthermore, in this case, since the case 1 is provided with the partition wall 11, the electromagnet 19 and the suction piece 17 can be positioned reliably when the yoke 4 is assembled.

Furthermore, a projection 7b provided on one end 7a of the armature 7 is rotatably supported in a support groove 6b of the armature support plate 6, and the projection 7b of the armature 7 is elastically supported by a protruding piece 8a of a leaf spring 8. Therefore, one end of the armature 7 can be supported in contact with the electromagnet 19 with a relatively simple structure.

Furthermore, the other end of the wire head 9 is provided with a contact body 1.
3 is fixed, and the tip of the abutting body 13 is made to protrude outward from the through hole of the stopper 14 by the spring 15, and the protruding part is pressed by the other end 7c of the armature 7. The positioning of the contact body 13, that is, the positioning at the other end of the wire head 9, is ensured, and the pressing operation of the wire head 9 by the armature 7 is ensured.

In the above embodiment, a rod-shaped suction piece is used and the value is set on the inner surface of the yoke, but the inner peripheral edge of the yoke may be bent and this bent portion may be used as a suction piece. As described in detail above, according to the present invention, it is possible to provide a wire head drive device for a dot printer that is small and simple in structure, can operate reliably, and is easy to assemble.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is an external side view, Fig. 2 is an exploded perspective view, Fig. 3 is an exploded perspective view showing the main parts enlarged, and Fig. 4 is the main parts. FIG. DESCRIPTION OF SYMBOLS 1... Case, 2... Guide body, 4... Yoke plate, 7... Armature, 7d... Intermediate part, 8...
...Plate spring, 11...Partition wall, 12, 16...Through hole, 17...Suction piece, 18...Electromagnetic core, 19
……electromagnet.

Claims (1)

[Claims] 1. A guide body which arranges one end of a plurality of wire heads facing the platen at equal intervals on a straight line, arranges each other end at equal intervals on the same circle, and guides the wire heads so as to move forward and backward. , an abutting body fixed to the other end of each of the wire heads, and a cap-shaped stopper having a through hole through which the tip of each abutting body projects outward and attached to the terminal end of the guide body. , a compression coil spring inserted between each of the abutting bodies and the guide body, and a substantially cylindrical shape with a bottom, and partition walls of the same number as the wire heads are provided on the inner peripheral surface at equal intervals and directed toward the center. A case in which the guide body is connected to the outer surface of the bottom plate through the stopper and the stopper is introduced into the inside through a through hole provided in the center of the bottom plate; has a through hole that overlaps with the through hole of the case, and around the through hole there are suction pieces and electromagnets in the same number as the wire heads, and the electromagnets are located outside and between the partition walls. A yoke plate to which the suction piece and one end of the electromagnetic core are fixed, and a yoke plate whose one end is in contact with each other end of the electromagnet core and whose one end is located on the open end side of an adjacent partition wall and rotated by an armature holding plate. an armature which is freely pivoted and whose intermediate portion is sucked by each of the suction pieces and rotates to press and drive the tip of the abutting body protruding from the through hole of the stopper at the rotating end; A wire head drive device for a dot printer, comprising a leaf spring disposed at an open end of the case to elastically press one end of each armature against the electromagnetic core.