JPH01216506A - Lagged type rotary solenoid - Google Patents

Abstract

PURPOSE:To perform the attracting action of a plunger slowly and to rotate an output shaft slowly, by exhausting a small amount of air in a sliding chamber for the plunger through an air hole having the small cross sectional area of a path when the plunger is attracted. CONSTITUTION:When a solenoid coil 4 is excited, a plunger 5 is attracted and lowered against the force of a spiral spring so that the spring is unwound. An output shaft 7 is rotated in the clockwise direction. The tip of the plunger 5 is brought into contact with a synthetic resin member 6 and seated on the member. This is the end of the stroke. When the excitation of the solenoid coil 4 is de-energized, the output shaft 7 is rotated in the counterclockwise direction by the winding force of the spiral spring 10. The plunger 5 is lifted up and returned to the original position. When the plunger 5 is attracted, air in a plunger sliding space A is exhausted through a small air hole 31 by a relatively small amount. Therefore, the attracting action of the plunger 5 is slowly performed, and the output shaft 7 is rotated at the low speed. When the plunger 5 is returned, a large amount of outer air is introduced through a large air hole 32 quickly. Therefore, the output shaft 7 is rotated quickly in the reverse direction.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotary solenoid, and particularly to a slow-acting rotary solenoid that can slow down the suction operation speed of a plunger.

(Prior Art) Conventionally, one of the methods for rotating mechanical parts of a mechanical device within a predetermined angle range is to attach the mechanical parts to an output shaft that is fixed integrally with the rotor of a stepping motor. It is known that a rotor is rotated by supplying a pulse signal to the rotor.

(Problems to be Solved by the Invention) However, this device has the problem that when using a stepping motor, the device becomes large-scale, such as requiring a controller for control, and the device as a whole becomes expensive. be.

There is also a rotary solenoid in which a horizontal disk is integrally attached to the outer end of the plunger that is attracted by an electromagnetic coil, and the linear movement in the axial direction of the plunger is converted into rotational movement of the horizontal disk. However, this device has a problem in that its rotation range is small and its uses are limited.

In addition, as mentioned above, in such a rotary solenoid, the plunger is sucked by an electromagnetic coil, but the suction operation has a characteristic that after the suction starts, it accelerates rapidly and reaches the stroke end instantaneously. There is.

According to this, when the mechanical parts etc. are to be rotated instantaneously, there is an advantage that the operating speed of movable parts such as valve bodies can be increased, but conversely, when the mechanical parts etc. are desired to be operated slowly This was impossible to achieve with conventional rotary solenoids.

For example, some pachinko machines installed in amusement machines have been devised so that the so-called tulip pieces that open and close the scoring holes on the board are gently opened and closed, but in conventional machines, the driving force of the motor is transferred to a gear device, etc. The only method available was to reduce the speed and transmit it to the tulip drive means, which had a complicated structure and required a large installation space.

Therefore, the realization of a rotary solenoid that slows down the suction operation speed of the plunger has been awaited.

The present invention has been made in view of the above-mentioned conventional problems, and has a configuration in which linear motion in the axial direction of a plunger attracted by an electromagnetic coil is converted into rotational motion by a simple mechanism, It is an object of the present invention to provide a motion rotary solenoid with a slow operating speed.

<Means for Solving the Problems> Therefore, the present invention includes a plunger that is attracted by an electromagnetic coil, and a plunger that is disposed in a direction substantially orthogonal to the plunger at a position apart from the plunger, and that is rotatably supported. and a thinly wound spring having one end fixed to the proximal end of the plunger and the other end fixed so as to be able to be wound in the same direction as the output shaft, and the suction operation of the plunger. An air hole with a small passage cross-sectional area for letting the air in the plunger space escape to the outside when the plunger is in use, and a one-way valve with a large passage cross-sectional area for guiding external air into the plunger sliding space during the counter-suction operation of the plunger. The structure has a hole.

(Function) In such a configuration, when the plunger is attracted by the electromagnetic coil, the linear motion of the plunger in the axial direction is converted to rotational motion of the output shaft via the thinly wound spring, and conversely, the excitation of the electromagnetic coil is released. The plunger is returned to its original position by the force of the spirally wound spring.

During the suction operation of the plunger, the air in the plunger sliding space is discharged to the outside little by little from the air hole with a small passage cross-sectional area, so the suction operation of the plunger is performed slowly, and the output shaft slowly moves. It is made to rotate.

At this time, the one-way valve closes the air hole, which has a large passage cross-sectional area, so that air is prevented from passing through.

On the other hand, during anti-suction operation of the plunger, the one-way valve opens and external air is immediately introduced into the plunger sliding space through the air hole with a large passage cross-sectional area, and the plunger returns quickly, so the output shaft It is quickly reversed.

<Example) Next, embodiments of the present invention will be described based on the drawings.

1 and 2, the slow acting rotary solenoid according to the present invention has an electromagnetic coil 4 disposed in a case l.
．． Plunger 5. Output shaft 7. It is configured with a spiral spring lO and the like.

The case l has a substantially trapezoidal shape when viewed from the side, and an iron housing 3 housing a cylindrical bobbin 2 is disposed at the lower part of the case l, and the bobbin 2 is connected to a power source (not shown). An electromagnetic coil 4 is wound thereon.

Further, the center of the bottom of the housing 3 is a fixed iron core 3a, and the inner end surface of the fixed iron core 3a is depressed into a substantially truncated conical shape corresponding to the shape of the tip of a plunger 5, which will be described later.

A synthetic resin member 6 that is a non-magnetic material is provided on this inner end surface.
This prevents the plunger 5 from becoming difficult to detach from the fixed iron core 3a due to residual magnetism in the fixed iron core 3a, and also prevents the tip of the plunger 5 from being worn out.

The plunger 5 is a cylindrical body with a substantially truncated conical tip;
It is composed of two members 5A and 5B that are connected by screw fitting, and is fitted into a hole 2a in the center of the bobbin 2 so as to be capable of linear movement in the axial direction. Further, a slit 5a is formed at the base end of the plunger 5, and one end of a spiral spring lO is connected and fixed to this slit 5a via a pin 11.

On the other hand, an output shaft 7 whose axial direction is perpendicular to the plunger 5 is disposed above the plunger 5 . The output shaft 7 is rotatably supported via a pair of bearings 8 and 9 disposed at the top of both side walls 1a and lb of the case 1, and one end protruding outward is provided with an optional covering. Rotating parts are provided so as to be connectable.

The plunger 5 and the output shaft 7 are connected and fixed by a spiral spring 10.

That is, the thinly wound spring 10 is a plate-shaped body made of, for example, spring steel, and as described above, one end is connected to the plunger 5, and the other end is connected to the outer peripheral surface of the output shaft 7 in a counterclockwise direction in FIG. and is fixed to the notch 7a with a screw 12. Further, the coiling spring force of the spiral spring lO is a value sufficient to return the plunger 5, which has been excited and attracted by the electromagnetic coil 4, upward while rotating the output shaft 7 counterclockwise after the excitation power is turned off. It is set to .

On the other hand, a seal ring 30 is provided for airtightly holding the sliding space A of the plunger 5, that is, the sliding space A formed between the hole 2a in the center of the bobbin 2 and the inner end surface of the fixed iron core 3a. It is fitted onto the peripheral surface of the plunger 5.

Note that, without providing this sealing member, a highly airtight sealing action may be achieved by strictly shaping the sliding clearance between the plunger 5 and the inner circumferential surface of the bobbin 2.

Further, in the body of the plunger 5, there is an air hole 31 (hereinafter referred to as a small air hole) with a small passage cross-sectional area that allows the air in the plunger sliding space A to escape to the outside during suction operation, and the plunger 5
An air hole 32 with a large passage cross-sectional area (hereinafter referred to as a large air hole) is provided to guide external air into the plunger sliding space A upon return, that is, during a counter-suction operation.

That is, the main air hole 33 is provided on the central axis of the plunger 5 from the tip of the plunger 5 to approximately the middle portion in the axial direction. The small air hole 31 penetrates obliquely upward from the upper end peripheral position of the main air hole 33 and opens to the outside (the first
figure).

The large air hole 32 extends upward from the upper end of the main air hole 33, and then bends laterally and passes through the plunger 5.
The main air hole 3 is opened at the outer periphery (Fig. 1).
3 and the large air hole 32 is provided with a check valve 34 as a one-way valve, which only allows air to flow into the plunger sliding space A from the outside.

In the figure, lc is a stopper for regulating the stroke of the plunger 5, and 13 and 14 are snap rings.

Next, the operation of the slow-acting rotary solenoid having such a configuration will be explained.

When the electromagnetic coil 4 is excited, the plunger 5 is drawn back and lowered while unwinding against the force of the spiral spring. As a result, the output shaft 7 rotates clockwise in FIG. 1, and the tip of the plunger 5 comes into contact with the synthetic resin member 6, reaching the end of the stroke.

Next, when the electromagnetic coil 4 is de-energized, the output shaft 7 is rotated counterclockwise in FIG. 1 by the coiling force of the spiral spring 10, and the plunger 5 is pulled upward and returned to its original position.

Although the above-mentioned spiral spring lO is shown as having a single wrap around the circumferential surface of the output shaft 7, it is double wound.

By winding the plunger 5 in three layers, the stroke of the plunger 5 is increased.
In other words, the rotation range of the output shaft 7 can be set appropriately.

Here, during the suction operation of the plunger 5, is the air in the plunger sliding space A small? Since a relatively small amount is discharged to the outside only from L31, the suction operation of the plunger 5 is performed slowly, and the output shaft 7 rotates at a low speed. At this time, no air passes through the large air hole 32 due to the action of the check valve 34. On the other hand, when the plunger 5 returns, a large amount of external air is quickly guided from the large air hole 32 into the plunger sliding space A. , the plunger 5 is quickly returned, and the output shaft 7 is quickly reversed.

Therefore, according to this configuration, the linear motion of the plunger 5 in the axial direction can be converted into the rotational motion of the output shaft via the thinly wound spring 10, and the manufacturing cost can be kept low with a simple structure. Since IO can be wound multiple times, the range of rotation of the output shaft can be appropriately set, which has the effect of broadening the range of uses.

Further, according to such a configuration, only the suction operation speed of the plunger 5 can be delayed without any problem in quickly returning the plunger 5.

As a result, it can be effectively used for gently rotating the mechanical parts of mechanical devices, and there is no need to provide a motor or speed reducer when moving the mechanical parts slowly.
It is also advantageous in terms of cost because the mechanism can be simplified and the installation space can be saved. In particular, it can be used extremely effectively as a device for slowing down the opening/closing operation of the tulip on a pachinko machine to an arbitrary speed, and since it is compact, it is advantageous in saving space when installed on a pachinko machine.

FIG. 3 shows another embodiment of the slow acting rotary solenoid according to the present invention, in which the shaft torque of the output shaft 21 is kept constant when the slow acting rotary solenoid is operated.
The portion of the output shaft 21 around which the other end of the spiral spring 10 is wound is formed into an elliptical camshaft 21a.

This camshaft 21a is set as follows.

That is, the above-mentioned axial torque is determined by the magnitude of the downward force exerted by the plunger 5 on the camshaft 21a via the spiral spring IO, and the vertical distance from the axis of the output shaft 21 to the point of application of the force. In addition, the plunger 5 is connected to the electromagnetic coil 4 (
When attracted by the electromagnetic force of the plunger 5 (see FIG. 1), the attraction force becomes stronger as the plunger 5 approaches the fixed iron core 3a (see FIG. 1). Therefore, the shape of the camshaft 21a is designed so that the distance from the axis of the output shaft 21 to the thinly wound spring 10 is long at the start of suction when the suction force is weak, and as the suction force increases as the plunger 5 descends, the distance increases. The diameter of the camshaft 21a is set to be the same as that of the output shaft 21 at the end of the stroke, and the initial position of the camshaft 21a is set so that the left and right direction in FIG. 3 is a long sleeve.

According to such a configuration, a constant torque can be constantly obtained without being affected by changes in suction force due to movement of the plunger 5.

FIG. 4 shows still another embodiment of the slow acting rotary solenoid according to the present invention.

In this embodiment, the air hole 35 controlled by the flow rate adjustment means is provided as a small air hole, realizing an adjustable slow-acting rotary solenoid, unlike the specific slow-acting in the embodiment of FIG. .

In this case, an air hole 35 is provided in place of the small air hole 31 in the embodiment shown in FIG. 1, and a needle valve 36 is provided to adjust the amount of restriction of the air hole 35.

This air hole 35 is a hole 3 that passes through the center of the fixed iron core 3a.
7 and a hole 38 that penetrates the bottom wall of the case 1 from the circumference of the hole 37 and opens to the outside. The needle valve 36 is constructed by screwing an adjustment screw 40 with a valve body 39 at its tip into the bottom wall of the case 1, and using this adjustment screw to move the valve body 39 up and down, it is connected to a seat provided on the inner peripheral surface of the hole 37. A variable orifice is created in between to adjust the flow rate.

According to this configuration, the sliding speed of the plunger 5 can be made variable by adjusting the flow rate of air discharged from the plunger sliding space A, and the optimal plunger suction operation speed, that is, the rotation of the output shaft 7 can be adjusted depending on the application. Since the speed can be obtained, a wide range of use can be achieved with only one rotary solenoid.

In addition, the large air hole 32 and the small air hole 3 shown in each of the above embodiments
1 and the air holes 35 are not limited to those shown in the drawings.

<Effects of the Invention> As explained above, according to the present invention, linear motion in the axial direction of the flange can be converted into rotational motion of the output shaft via a thinly wound spring, and manufacturing costs can be kept low with a simple configuration. In addition, by winding the spiral spring multiple times, the range of rotation of the output shaft can be appropriately expanded and the range of uses can be expanded.

In addition, when the plunger is in suction mode, the air in the plunger sliding space is discharged to the outside little by little from the air hole, which has a small passage cross section, and conversely, when the plunger is in anti-suction mode, the one-way valve opens and the passage cross section is Since external air is quickly introduced into the plunger sliding space through the large air hole, the suction operation speed of the plunger can be slowed down.
It is extremely effective for mechanical parts of mechanical devices that require slow rotational movement. In addition, it is an effective device that meets the needs of the market, as it has the advantage of having a simpler structure and requiring less installation space than conventional slow-acting means.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of a rotary solenoid according to the present invention, FIG. 2 is a partially sectional front view of the embodiment of FIG. 1, and FIG. 3 is a diagram showing another embodiment of the present invention. A partially sectional side view and FIG. 4 are longitudinal sectional views showing still another embodiment of the present invention. 4... Electromagnetic coil 5... Plunger 7... Output shaft lO... Spiral spring 31... Small air hole 32... ...Large air hole 35...Air hole A...Plunger sliding space

Claims (1)

[Scope of Claims] A plunger that is attracted by an electromagnetic coil; an output shaft that is arranged in a direction substantially perpendicular to the plunger at a position spaced apart from the plunger and rotatably supported; a spiral spring fixed to the base end of the output shaft and having the other end fixed so as to be able to be wound in the circumferential direction of the output shaft; An air hole with a small passage cross-sectional area for air to escape from the plunger, and an air hole with a one-way valve with a large passage cross-sectional area for guiding external air into the plunger sliding space during anti-suction operation of the plunger. slow acting rotary solenoid.