JPS59197630A - Digital electromagnetic clutch - Google Patents

Abstract

PURPOSE:To obtain an electromagnetic clutch which may gently operate and has a long service life, by providing such an arrangement that the transmission of large torque is controlled by a low pulse-like electrical input, and the transmission of a rotating angle or moving distance is controlled in accordance with the number of delivered electrical pulses. CONSTITUTION:A gear 4b rotates by 120 deg. each time an electrical pulse is delivered to a solenoid 20, and therefore, an associated load 1 may be stepped up. An eccentric rotary ring 4c has projecting parts the number of which may be changed whenever it is necessary although they are now three in number. By increasing the number of the projecting parts, the stepping of the load 1 may be made fine. Such an electromagnetic clutch is obtained that during energization of the solenoid 10 the load 1 is driven, but upon deenergization of the solenoid 20 the load 1 is stopped. With this arrangement, the rotation and translation of the load 1 may be carried out in accordance with the number of delivered electrical pulses, and therefore, the electromagnetic clutch which may be digitally controlled by a computer is obtained. Further, the operation of the electromagnetic clutch generates no mechanical sound, and the cluch has no wearable part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel configuration for an electromagnetic flanch. More specifically, it is an object of the present invention to provide a technical means for obtaining an electromagnetic flange capable of driving a load in accordance with the number of input pulses even with digital electric pulses. That is, it is characterized in that it is possible to step the load in accordance with the number of input electric pulses or to obtain a drive change proportional to the number of input electric pulses.

The purpose of a well-known electromagnetic flanch is to connect and disconnect two rotating systems by controlling energization. Since it operates depending on the presence or absence of an electric signal, it is easier to control than other flanch devices.

Therefore, it has found a wide range of uses. However, there are some drawbacks as described below.

Firstly, the required current is extremely large compared to the transmitted torque, which makes it difficult to use a large capacity power supply. Second, it has the disadvantage of generating a loud impact noise during operation. Thirdly, since the torque is transmitted by frictional coupling of the flange plates, there is a drawback that wear is involved, and therefore, the service life is limited. Fourth, since torque transmission control is only on/off and involves slipping, digital control is used to transmit rotation at a predetermined angle in response to one pulse input, with an integral error. This has the disadvantage that it is impossible to perform it accurately without Furthermore, there is a drawback that the flange plate is worn out.

The device of the present invention has succeeded in completely eliminating the above-mentioned drawbacks, and can control the transmission of large torques with extremely small pulsed electrical inputs, with little mechanical noise.
It operates silently, has no friction parts, provides a long service life, and has the characteristics of being able to control the transmission of the rotation angle or travel distance corresponding to the number of input electrical pulses.

It also has the feature of being able to take out multiple outputs from a single drive shaft.

Since it has the above-mentioned characteristics, it can be used in place of the well-known electromagnetic flange to produce remarkable new and excellent effects. In particular, as will be described later, electric vehicles, bicycles (wheelchairs) powered by small gasoline engines, reciprocating devices for copier document tables or lighting devices, driving sources for sewing machine needles, printer driving sources, and liquid flow rates. The present invention has the effect of providing effective technology that can be applied to control devices for opening and closing valves and various automatic machines (vending machines, robots, etc.) for the adjustment of valves.

Next, details of the apparatus of the present invention having the above-mentioned features will be described with reference to embodiments.

Further, the gear 2 is also rotatably supported on the support shaft 2a.

A swimming wheel 4b is rotatably supported on a support shaft 4a mounted on the lever 3. The symbol 4 is a pulley that is made of plastic and is integrated with the wheel 4b.

Therefore, it rotates synchronously with the gear 4b. Boo'J 5 b is fixed to the rotating shaft 5c of the electric motor 5 fixed to the main body, and rotates in the direction of the arrow (clockwise).

A rotary lever 3a (hereinafter, the rotary lever will simply be referred to as a lever) is rotatably supported on the support shaft 2a.

Further, the support shaft 4a is provided with an eccentric rotating ring (rotating cam) 4C that is integrated with the gear 4b, and the lever 3a is lightly pressed against the peripheral edge of the eccentric ring 4C by a spring 6a. The support shaft 2a of the lever 3a is shared with the lever 3,
It may be provided separately in the main body.

An excitation coil 20 is attached to the U-shaped yoke 18 fixed to the main body.
The lever 3 is locked at the position shown when the yoke 18 closes the magnetic path of the magnetft 19 which is attached and magnetized to the N1S fixed to the rotating lever 3a.

The spring 6 is hung on the lever 3 in a direction that tensions the belt 1o. The eccentric rotating wheel 4c, which serves as a rotating cam, is provided with protrusions with equal pinch angles of 120 degrees.

When an electric pulse is input to the excitation coil 20, the magnetic flux generated by the excitation coil 20 is in the opposite direction to the magnetic flux of the magnetophore 19, so the attractive force between the yoke 18 and the pad 19 disappears. , the lever 3a is unlocked.

Therefore, due to the action of the spring 60, a torque is applied to the lever 3 to rotate it clockwise. Since the belt 10 is hung between the pulley 5b and the pulley 4, the belt 10
is tensed, and the pulley 4 rotates clockwise. Also, since the gears 4b and 2 are meshed, the gear 2il-J is driven counterclockwise. Therefore, the load 1 connected to the gear 2 (driven by a required torque transmission system) is driven.

As the gear 4b rotates, the lever 3 receives clockwise torque, and the tension on the belt 1 ( ) further increases, increasing the transmitted torque. There is a characteristic that the larger the load 1 is, the larger the above-mentioned transmitted torque becomes. Therefore, if the spring is 6, a relatively weak spring will suffice, so the mag
The magnetic force of the lever 9 only needs to be small, and the power applied to the excitation coil 20 to eliminate the locking of the lever 3 can also be small. Therefore, the electric foundation locking device described above is characterized by being small and lightweight. When pulley 4 rotates, part 1
The lever 3a also reciprocates once every /3 rotation, and when the lever 3a or the eccentric rotating wheel 4C is in the illustrated state in which it is pressed at a position near the minimum deflection point, the magnetofte 19 of the lever 3a is Since it contacts the open end of the magnetic path of the yoke 18 and closes the magnetic path of the magnetofte 19, it is strongly attracted. That is, the lever 3a is locked. As the pulley 4 further rotates at a slight angle, the lever 3 rotates counterclockwise via the eccentric rotating wheel 4C, and the belt 10 slackens and therefore slips, the transmitted torque disappears, and the pulley 4 stops. . As can be understood from the above operations, the belt 10 has a small degree of elongation.
For example, it is better to use Myra belt. Furthermore, when the transmitted torque is large, an endless steel belt or V-belt is preferable. When the belt becomes loose, pulley 4.5b
To prevent the pulley from coming off, it is recommended that each pulley be provided with a collar. In this embodiment, the electric motor 5 is used as the drive source, but the present invention can also be practiced with other power sources, such as a gasoline engine.

As explained above, one electric pulse is applied to the excitation coil 20.
Since the gear 4b rotates by 120 degrees each time the input is inputted, the load 1 can be stepped forward accordingly. The number of protruding parts of the eccentric rotating wheel 4C is three, or the number can be increased or decreased as necessary. By increasing the number of protrusions, there is a feature that the steps of the load 1 can be made finer.

Also, if the excitation coil 20 is kept energized, during that time,
The load 1 is driven and also serves as an electromagnetic flanch that stops when the current is cut off.

Although the stopping point at which the pulley 4 stops after making 1/3 rotation differs slightly from rotation to rotation, no error occurs in the integrated stopping point.

As explained above, since the load can be rotated and translated in accordance with the number of input electric pulses, it has superior performance compared to the conventional well-known electromagnetic flange, and is particularly suitable for computer-based numerical control, i.e., digital This has the effect of making it possible to obtain a controllable electromagnetic flanch.

In addition, it is small and lightweight, can control large torque, and requires only a small amount of control power.

Historically, the operation does not involve the generation of mechanical noise, there are no parts that wear out, and there are advantages in that it is durable.

The electromagnetic locking device can also adopt a means of locking the lever 3a by removing the madanent 19 and using it as a cornerstone when the excitation coil 20 is energized, but this has the drawback of increasing power consumption. However, other well-known electromagnetic locking devices may be used as long as the generation of some mechanical noise is acceptable.

The embodiment shown in FIG. 2 is an example in which the load is driven not by belt transmission but by a rotary wheel (including gear meshing) via a drive rotary wheel 5a fixed to the rotary shaft 5c of the electric motor 5.

is rotatably supported, and a support shaft 23 is mounted on the lever 22.
A rotary wheel 23 (the peripheral edge of which is covered with a rubber ring) and a synchronously rotating gear 23b are rotatably supported. Further, gears 23b and 21 are in mesh with each other. A rotating wheel 5a is fixed to the rotating shaft 5C of the electric motor. A spring 26a is applied to the lever 22, and resiliently biases the lever 22 in a direction that brings the rotating wheels 23 and 5a into pressure contact. A lever 22a is rotatably supported on the support shaft 21a. The eccentric rotating wheel (rotating cam) 23c is integrated with the gear 23b, and the lever 2 is attached to the peripheral edge thereof.
2a is lightly pressed against the elastic force of the spring 26b.

The device indicated by symbol 18 and ■9.20 is completely similar to the electromagnetic locking device shown in Fig. 1, and locks the lever 22a against the elastic force of the spring 26a. . By energizing the excitation coil 20, the lever 2 is activated by the electromagnetic locking device.
When the lock of 2a is released, the rotating wheels 23 and 5a are pressed together, and the rotating wheel 5a, which rotates in the clockwise direction of the arrow, drives the rotating wheel 23 and gear 23b counterclockwise. - Due to the reaction that drives the gear 21, which acts as a load, the lever 2
2 receives counterclockwise torque, and as the load increases, the pressure contact force between the rotating wheels 23 and 5a increases accordingly, which has the effect of preventing slippage and ensuring power transmission. Therefore, the spring 26a may be weak, and the electromagnetic locking devices 18, 19, 20 may also be small and require a small input force.

Furthermore, when the rotating wheels 5a and 23 are brought into pressure contact with each other at a biting angle, the transmitted torque is further increased.

When the excitation coil 200 of the electromagnetic locking device is de-energized, the 1/bar 22a is locked by the electromagnetic locking device at the position where it is most offset to the left. Furthermore, by the rotation of the rotating wheel 23 at a slight angle, the lever 22 is rotated clockwise via the rotation of the eccentric rotating wheel 2:3c, so that the rotating wheel 22 is rotated clockwise.
3 separates from the rotating wheel 5a, power transmission is automatically cut off, and the gear 21 stops.

The same effect can be obtained by using the rotating wheels 23 and 5a as gears and meshing them.

As can be understood from the above explanation, the gear 21 is driven as long as the excitation coil 20 of the electromagnetic locking device is energized, and when electric pulses are input to the excitation coil 20, the gear 21 is driven in response to the number of pulses. The gear 21 advances. Eccentric rotating wheel 23
Since there are two protrusions at 180 degrees, the gear 23b rotates 1/2 turn each time one electric pulse is input to the excitation coil 20, and this effect is the same as in the previous embodiment. It is.

In the case of driving a load in which it is convenient to set the stepping position, that is, the stopping point, to exactly one fixed position, the other means is effective.

A mild steel rotating wheel 24 that is coaxial with the gear 21 and rotates synchronously is provided,
Moreover, there are protruding parts 24a, 24b, 24c.
, 24 d is provided. Projecting parts 24 a, 24 b
1. A yoke 25 is fixedly provided on the main body, and an excitation coil 25a is attached to the yoke 25 so that the magnetic path is closed.

When the excitation coil 20 included in the electromagnetic locking device is energized, when the energization is controlled by a seesaw circuit in which the excitation coil 25a is de-energized, the yoke 25 closes the protrusion 24a at the stopping point of the rotating wheel 24. ,,24b
is strongly attracted and braked, so the stopping point, that is, the stepping position or stopping point of the load becomes accurate. It is more effective to provide an electric switch that is closed when the lever 22a is in the locked position, and to energize the excitation coil 25a using this output and an AND circuit.

Next, the details will be explained with reference to FIG.

In FIG. 3, the excitation coil 20.25a has the same symbol as in FIG.

In addition, in FIG. 2, when facing each set of protrusions 24a, 24b, 24c, and 24d of the rotating wheel 24 made of a magnetic material, the protrusions are closed due to a change in inductance, resulting in an output gain. Well-known non-contact switch 3
1a and 31b are fixedly provided to the main body. The non-contact switches 31a and 31b are shown in FIG. 3 with the same symbols. When an electric pulse is input from the terminal 28a in FIG. energize more.

Therefore, gear 21.23b in FIG. 2 rotates 1/2 and stops, driving load 1. At this time, the protrusion 24a124
b is also rotated by 1/2, and the protrusions 24 c and 24 d are
Since the protrusions 24a and 24b face the open end of the magnetic path of the yoke 25, and at this time also face the non-contact switches 31a and 31b, the output thereof is obtained, and the output is obtained from the AND circuit 31 in FIG. can get. Also, the Schmint trigger circuit 28 is inverted, its outputs are alternated, and the AND rotation l! Since the output is obtained from 32, the transistor 29
becomes non-conductive, transistor 30 becomes conductive, and excitation coil 25a is energized. Therefore, the protrusion 24c24
d is strongly attracted by the yoke 25, and the gear 21 is braked. The schmint trigger circuit z8 may be implemented by other means that accomplish the same purpose.

As described above, the gear 21 rotates 172 times and is braked every time there is an input electric pulse, which has the effect of making the step position of the load 1 accurate. If the input to the terminal 28a continues, the load 1 will continue to be driven, and if the input is cut off, it will be braked and stopped. It is clear that similar means can be added to the embodiment of FIG.

It is also possible to use a reversible counting circuit to drive a load corresponding to the counted number of pulses using well-known means.

Although the position detection device is configured by the non-contact switches 31a and 31b facing the protrusions 24a, 24b, . The same purpose can be achieved even if the number is set at 24.

As explained above, according to the apparatus of the present invention, the object stated at the beginning is achieved and the effect is remarkable.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams of different embodiments of the device of the present invention, and FIG. 3 is a diagram of the energization control circuit for the excitation coil. 1... Load, 2.4b, 21.23 b... Gear, 3.3a, 22.22a... Lever, 2
a, 4 a, 21a. 23a... Support shaft, 23c, 4c... Eccentric rotating wheel, 6.5 a, 26a, 26b-spring,
5b, 4 = Pu・m body rotation wheel, 24a, 24
b, 24c, 24d - protrusion, 31a, 31b
... Non-contact switch, 28... Schmint trigger circuit, 31.32... AND circuit, 29.30... Transistor, 27... Power supply positive terminal.

Claims (3)

[Claims] (1) A drive pulley that is driven and rotated by a prime mover, a first gear and a first rotating lever that are rotatably supported by a support shaft provided on the main body, and a free end of the rotating lever. A booby is rotatably supported by a spindle provided in the drive pulley, a belt is hung between the drive pulley and the drive pulley, and the belt rotates coaxially and synchronously with the pulley. a second gear that meshes with the gear; an eccentric rotating wheel having a plurality of protrusions with equal pinch; a second rotating lever that is rotatably supported on a support shaft provided on the main body;
A resilient member is elastically repelled so that the free end of the rotary lever comes into pressure contact with the peripheral edge of the eccentric rotating wheel, the valve driven by the first gear, the load, and the belt are tensioned. The resilient member provided on the first rotary lever and the free end of the second rotary lever are locked against the repelling force of the resilient member, and the eccentric rotating wheel is locked. When the first gear is driven by the electromagnetic locking device that holds the belt in a loosened state and the second gear at a position where the vicinity of the minimum deflection point touches the 20th rotation lever. , a mechanism in which the belt generates a tension corresponding to the magnitude of the load due to the torque received by the first rotary lever due to the reaction of the load; and an excitation coil included in the electromagnetic locking device. A digital electromagnetic flange comprising: a control circuit for locking or unlocking a 20th rotary lever by controlling energization of the 20th rotary lever. (2) A drive wheel driven and rotated by a prime mover, a first gear rotatably supported by a support shaft provided on the main body, a first rotary lever, and a free end of the rotary lever. A rotary wheel rotatably supported by a support shaft provided in the rotary wheel, a second gear that rotates coaxially and synchronously with the rotary wheel and meshes with the first gear, and a plurality of protrusions with an equal pinch. A second rotating lever rotatably supported by an eccentric rotating ring provided on the main body, and a free end of the rotating lever is pressed against the peripheral edge of the eccentric rotating ring. an elastic member that is elastically repelled as such, a load driven by a first gear,
In order to bring the rotating wheel and the drive wheel into pressure contact, the elastic portion provided on the first rotating lever and the free end of the second rotating lever are connected to each other so that the resilient portion of the elastic collar member is pressed against the rotating wheel. Lock against the force,
At a position where the vicinity of the minimum deflection point of the eccentric rotating wheel contacts the second rotating lever, an electromagnetic locking device that holds the rotating wheel and the driving rotating wheel slightly apart from each other, and a second gear lock the first rotating lever. When the gear is driven, due to the reaction of the load, the torque received by the first rotating lever causes the pressing force between the rotating wheel and the drive wheel to correspond to the magnitude of the load. It is composed of a mechanism that generates a pressure contact force, and a control circuit that locks or unlocks the second rotating lever by controlling the energization of the excitation coil included in the electromagnetic locking device. Features a digital electromagnetic lamp. (3) In the scope of the claims set forth in paragraph (1) or (2), the braking rotary wheel driven by the first gear and the circumferential portion of the rotary wheel are provided with an equal pinch. a protrusion, a U-shaped yoke fixed to the main body, a first excitation coil attached to this, a second excitation coil included in the electromagnetic locking device, and a set of the two described above. a position detection device that detects the position of the braking rotary wheel when the magnetic protrusion faces the open end of the magnetic path of the yoke and generates a position detection output; , controls the energization of the second excitation coil to lock the second rotating lever, and cooperates with an electric signal obtained at the end of the locking and an electric signal obtained from the position detection device. A digital electromagnetic franchise comprising: a control circuit that energizes a first excitation coil and de-energizes the first excitation coil when the lock is released.