JPS5811088B2 - electromagnet device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plunger type electromagnet device in which the gap between a movable iron core and a fixed iron core is not adjusted.

An object of the present invention is to incorporate a fixed iron core and a movable iron core in a coil frame, provide a step part and a locking part on the inner diameter of the coil frame, and engage the fixed iron core in the step part and the movable iron core in a locking part, respectively. , the purpose is to maintain the gap between the fixed core and the movable core constant without adjustment.

Another object of the present invention is to provide a stable electromagnet device with low power consumption by keeping the gap between the fixed iron core and the movable iron constant.

FIG. 1 shows a print head using the electromagnetic device of the present invention, and FIG. 2 shows the structure of the electromagnetic device of the present invention, and will be described in detail below.

In FIG. 1, iron core portions 11 are arranged concentrically around a bowl-shaped yoke 10. As shown in FIG.

Coil frame 1 in which electromagnetic coil 15 is wound around fixed iron core 11
4, the stepped portion 141 provided in a part of the coil frame 14 and the head 111 of the fixed iron core 11 come into contact and the position is determined.

A recess 121 is provided in the yoke plate 12.

This yoke plate 12 is fitted into the yoke 10 so as to press the stepped portion 141 of the coil frame 14 against the head 111 of the fixed iron core 11, and a part of the yoke 10 is distorted and inserted into the recess 121, and the continuation plate 12 is not removed. I'm trying to stop it.

The movable iron core 13 is guided by the inner cylinder of the coil frame 14, and the
7 engages the wire support member 16.

The wire support member 16 has a cylindrical shaft portion 161, and this shaft portion 161 is guided and supported by the guide member 19, so that the wire support member 16 can rotate around the shaft portion 161.

The tip of the wire support member 16 is guided by a guide shaft portion 211 provided on the spring receiver 21 to prevent deflection.

The wire 18 is fixed to the wire support member 16. For example, when the wire support member 16 is molded from plastic, the wire 18 is inserted and fixed during molding.

The spring receiver 21 receives one end of the spring 20, and the spring 20 always applies a clockwise rotational force to the wire support member 16.

The wire 18 is connected to the intermediate guide member 22 and the tip guide member 23.
Thus, the intermediate member 22 and the distal end guide member 23 are fixed to the support member 24 .

Support member 24 is fastened to yoke 10.

In FIG. 2, fixed core 11 is fixed to yoke 10. In FIG.

When the yoke 10 is manufactured by a manufacturing method such as sintering, the fixed core 11 and the yoke 10 can be manufactured integrally.

The movable core 13 is incorporated into the coil frame 14 at the same time when the coil frame 14 is inserted into the fixed core 11.

A protrusion 143 is provided on the coil frame 14 and the movable iron core 13
The part where it goes is reinforced.

The yoke plate 12 is provided with irregularly shaped holes 122.

When fitting the continuation plate 12 into the yoke 10, this irregularly shaped hole 1
A part of the coil frame 14 is inserted into 22.

In FIG. 1, spring 20 imparts clockwise rotation to wire support member 16 when electromagnetic coil 15 is in a de-energized state.

Therefore, the movable core 13 is pulled in the direction of arrow a via the pin 17, the shoulder 131 of the movable core 13 hits the locking part 142 of the coil frame 14, and a predetermined gap is created between the movable core 13 and the fixed core 11. I can do it.

When the electromagnetic coil 15 is excited, magnetic flux flows through the fixed iron core 11, yoke 10, yoke plate 12, and movable iron core 13, and the movable iron core 13 is attracted toward the fixed iron core 11.

The movable iron core 13 rotates the wire support member 16 counterclockwise via the pin 17.

Since the wire 18 is flexible, it moves linearly while being guided by the intermediate guide 22, the tip guide 22, and the tip guide 23, and passes through the ink ribbon 25 and printing paper 26 to the platen 27.
collide with

The characters are printed on the printing paper 26 by dots.

The distance between the platen 27 and the tip 181 of the wire 18 is 0.
Since it is very small, around 5 mm, the wire support member 16 only needs to be slightly rotated, and the linear movement of the wire 18 is further ensured.

The position where the wire 18 is fixed to the wire support member 16 can be very close to the center position 28 of the circle in which the movable core 13 is arranged.

Therefore, the path of the wire 18 is free from germs, the wear of the tip guide 23 is extremely small, and the wear load due to the linear movement of the wire 18 is also extremely small.

Head 111 of fixed core 11 and stepped portion 14 of coil frame 14
1, the yoke plate 12 presses against the coil frame 14 so that the yoke plate 12 comes into close contact with the coil frame 14.

Further, when the electromagnetic coil 15 is in a non-excited state, the shoulder portion 131 of the movable core 13 hits the locking portion 142 of the coil frame 14, creating a gap between the movable core 13 and the fixed core 11.

Therefore, this gap distance 29 is the distance between the coil frame 14 and the movable iron core 13.
Because it depends only on the manufacturing precision of

The moving distance of the movable iron core 13 is further reduced by the wire support member 16 compared to the moving distance of the wire 18 .

Since the variation in the cal gap distance 29 is extremely small, the movement distance of the movable core 13 is guaranteed without adjustment.

Depending on the characteristics of the electromagnet, the smaller the gap distance 29, the more efficient the electromagnet can be obtained.

Therefore, the coil frame 14 is provided with a step portion 141 and a locking portion 142, and the fixed core 11 is held at the step portion 141 by the locking portion 14.
By guiding the movable core 13 with 2, the fixed core 1
Since the air gap distance 29 between the movable iron core 1 and the movable iron core 13 is kept small and constant, an electromagnetic device with high efficiency and low power consumption can be obtained.

Furthermore, since the movable iron core 13 and the fixed iron core 11 are housed inside the shell of the coil frame 14, they can be driven with a low current and provide a large amount of power.

Furthermore, the movable core 13 is connected to the stepped portion 141 and the locking portion 142.
Since the iron core portion 11 is guided, the gap distance 29 between the fixed iron core 11 and the movable iron core 13 can be kept constant without adjustment.

As described in detail above, according to the present invention, the gap distance between the movable core and the fixed core can be maintained constant without adjustment, thereby providing an electromagnet device that is inexpensive, consumes little power, and operates stably and efficiently. can do.

Even if this electromagnetic device is applied to a drive source for a print head that drives a wire to form characters in dots, in addition to the above-mentioned effects, it is possible to print clearly with low power consumption, and to improve the print head. This enables miniaturization.

[Brief explanation of the drawing]

Figures A and B in Fig. 1 show the structure of a print head using the electromagnet device of the present invention, and Fig. 2 shows the structure of the electromagnet device of the present invention. 10...Yoke, 11...Fixed iron core,
12...Yoke plate, 13...Movable iron core,
14... Coil frame, 142... Locking portion, 15... Electromagnetic coil, 16... Wire support member, 18... Wire , 26...
...Printing paper.

Claims (1)

[Claims] 1. In a plunger-type electromagnet device, a fixed iron core whose one end is fixed to a yoke, a movable iron core arranged to face the other end of the fixed iron core so as to be attracted to the other end of the fixed iron core during excitation, and a movable iron core that is fitted into the fixed iron core and has a movable iron core that is attached to the other end of the fixed iron core are attached to the fixed iron core. It is composed of a coil frame around which a coil is wound, which is provided with a stepped part that is positioned in contact with the other end and a locking part that positions the movable core when not energized, and the fixed core and the movable core are mounted on the coil frame. An electromagnet device which is installed internally and has a constant air gap between the fixed iron core and the movable iron core by the stepped portion and the locking portion when not energized.