JPH0119243B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a trigger electromagnet for a miniature printer.

A conventional device of this type will be explained with reference to FIG. FIG. 1 shows a component configuration, in which a movable core 1 is fitted onto a guide rod 2 and forms a magnetic circuit together with a yoke 4 and a fixed core 5 fitted onto the yoke.

The guide rod 2 is guided by a bush 6 provided in the center hole of the fixed core 5, and guides the movable core 1 in the direction of arrow A by the magnetomotive force of the coil 3, thereby driving the trigger transmission member 10. After cutting off the power to the coil 3, the movable core 1 returns in the direction of arrow B by the force of the return spring 9, and the E-type retaining ring 8 inserted into the guide rod 2
This positions the trigger transmission member 10 in a standby state via the washer 7. In conventional trigger electromagnets having such a configuration and operation, the stroke of the electromagnet is determined by the precision of many parts and the precision of fitting, resulting in extremely poor precision. This is a major drawback in providing an inexpensive trigger electromagnet with high operational stability.

The present invention has been made in view of the above drawbacks, and an object of the present invention is to provide an inexpensive trigger electromagnet that is highly stable and easy to assemble.

The drawings will be explained below. FIG. 2 is a perspective view of a specific example of the present invention, and FIG. 3 is a side sectional view. The magnetomotive force obtained when the coil 12 wound around the coil frame 11 is energized by a trigger signal forms a magnetic circuit. Fixed iron core 14, yoke plates 131, 132
After that, the movable iron core 15 is attracted in the direction of arrow C, and the attraction is completed when it hits the spacer 19 made of a non-magnetic material. The movable iron core 15 is fitted with a suction plate 16, and the suction plate 16 contacts the yoke plate along a line 165 by means of a trigger spring 17, rotates about the tangent line 165, and engages with the trigger transmission member 20 through a hole 164. drive it together. After the trigger signal is cut off, the movable iron core 15 returns in the direction of arrow D by the trigger spring 17 that engages with the suction plate 16, and a portion 16 of the suction plate 16 is attached to the tip 182 of the trigger degree 18.
By hitting 1, positioning is performed during standby.
The trigger part 18, which is made of non-magnetic metal, is a piece 111 protruding from a part of the plastic coil frame 11.
Using the elastic deformation in the direction of arrow F, the coil frame 11 is inserted into the hole 181 provided in the trigger position 18.
By inserting the piece 111, the piece 111 and the yoke plate 131 or the part 1 of the coil frame 11
It can be easily clipped between 12. Further, the operating range of the movable iron core 15 can be plastically deformed to the extent that it is not deformed by the impact energy with the suction plate 16 by providing a hole 183, a notch 184, etc. in the trigger point 18, which is made of non-magnetic metal or the like. , tip 1
By utilizing the plastic deformation in the direction of arrow E at 82, it is possible to easily adjust the trigger electromagnet completely independently of the machining accuracy of other parts, and it is possible to provide a trigger electromagnet with stable operation.

FIG. 4 shows an example of the adjustment method, which will be explained below. Tip per trigger degree 18
The parts 2 are machined in advance so that they are in the direction of arrow E' from a position comparable to the desired operating range of the movable core 15. Next, the piece 211 of the jig 21 is used to bring the movable core 15 into the same state as when the suction is completed, that is, into a state where it is pressed against the spacer 19. At this time, the piece 212 of the jig 21 plastically deforms the tip 182 per trigger degree at the same time in the direction of the arrow E''. The spring back amount of the tip 182 can be easily and accurately determined, and the operating range of the movable core 15 can also be accurately adjusted completely independently of the accuracy of other parts.

Although not shown in this figure, parts are machined in advance so that the tip 182 of the trigger point is oriented in the E'' direction, contrary to that shown in FIG. It is also possible to adjust the operating range of the suction plate 16 by inserting a jig between the two and placing the suction plate 16 in a standby state and plastically deforming the tip 182 per trigger degree in the direction of arrow E'.

As described above, the present invention has the following remarkable effects.

That is, since the trigger point for positioning the suction plate when the return is completed is fitted into the engaging portion formed on at least one side wall end of the coil frame, the assembly work is easily and reliably performed. Furthermore, no fixing parts such as screws are required.

In addition, the tip of the trigger point, which is the point of contact of the suction plate, has a notch and is plastically deformed by external force and is displaced relative to the fixed core. is pressed to cause deformation in the notch, and the tip can be displaced to a predetermined position, making it possible to adjust the stroke of the suction plate extremely easily and reliably.

Furthermore, the trigger level is non-magnetic metal,
When adjusting the stroke of the suction plate described above, there is no need to deform the members constituting the magnetic circuit.
There is no possibility that the magnetic properties of the trigger electromagnet will be adversely affected by the trigger degree itself or the stroke adjustment work.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating a conventional device;
FIG. 2 is a perspective view showing a specific example of the present invention;
FIG. 4 is a side sectional view. 1...Movable iron core, 2...Guide rod, 4...Yoke plate, 5...Fixed iron core, 11...Coil frame, 13
1,132... Yoke plate, 14... Fixed iron core, 15
...Movable iron core, 16...Suction plate, 17...Trigger spring, 18...Trigger degree per, 21...Jig.

Claims (1)

[Claims] 1. In a trigger electromagnet operated by a trigger signal, a coil 12 wound around a coil frame,
Fixed iron core 14 and yoke plate 13 forming a magnetic circuit
1, 132, a movable iron core 15, a suction plate 16 to which the movable iron core is fixed and rotatably held by the yoke plate, and a trigger spring 1 that urges the suction plate in the return direction.
7, a distal end portion 182 is formed which is fitted into an engaging portion formed on at least one side wall end of the coil frame, has a notch 184, and is plastically deformed by external force and displaced with respect to the fixed iron core. A trigger electromagnet for a small printer, characterized in that the trigger electromagnet has a trigger force of 18 made of a non-magnetic metal plate, and the tip portion contacts the suction plate surface to position the suction plate when the suction plate completes return. .