JPH11200743A - Clutch releasing device of electric motor with brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To release the coupling of an electric motor with a brake in which the brake is worked at the time of stop of a rotating shaft and an output shaft by small force and lessen impact sound at the time of operation. SOLUTION: An electric motor 1 brings the brake plate 10 of a brake mechanism 2 into a friction plate 12 at the time of stop of a rotating shaft to work a brake. The rotating shaft is coupled to the winding shaft of a shutter through a clutch mechanism 4. When an operation lever is operated at the time of power failure, emergency or the like, the releasing arm of a brake releasing means 21 is operated through a releasing cable 30a to move the brake plate 10 in the releasing direction, the releasing arm 28 of a clutch releasing means 27 is operated through an elastic body 34, and a clutch plate 16 is moved from a fixing plate 15 in the releasing direction. The electric motor 1 is rotated until torque applied on the output shaft is relieved by brake releasing, when torque is a prescribed value or less, the shutter is manually opened and closed by small operation force and operation sound can be lessened since the clutch plate is released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch release device for a motor with a brake provided with a brake for maintaining this state when an opening / closing member such as a shutter stops opening and closing. Device that can easily and manually release the clutch between the two.

[0002]

2. Description of the Related Art An electric motor with a brake for opening and closing a shutter or the like is configured to operate a brake when the electric motor stops to maintain a stopped state of a shutter curtain. When the brake is released, the shutter curtain is manually operated. It can be opened and closed. The shutter curtain is provided with an equilibrium spring on the winding shaft, so that the weight of the shutter curtain is balanced by the spring. And, the above-mentioned brake is B. a configuration in which a clutch provided on an output shaft (near a connection portion with a shutter take-up portion) is released; In general, there are two types, that is, a configuration in which a brake of an electric motor is released.

[0003]

A. Problem to be Solved by the Invention Problems of the configuration for releasing the clutch provided on the output side When the load of the shutter curtain is applied to the output shaft, a large force is required to release the clutch. this is,
When the balance between the spring of the take-up shaft and the load of the shutter curtain is not good, the shutter curtain descends to this lower limit position with the setting of the lower limit switch that detects the lower limit position of the shutter curtain is almost overrun. When the load of the shutter curtain is applied to the floor and the torque of the spring of the take-up shaft is unbalanced, the load of the shutter curtain is fully applied to the floor when the slit shutter is fully closed and the spring of the take-up shaft Are generated when all the torques are applied to the output shaft (for example, about 50 kg.cm). Further, when the clutch is released in the above state, the winding shaft rapidly rotates in a direction in which the load of the spring and the load of the shutter curtain are balanced, so that an impact sound is generated. At this time, the shutter curtain starts to move up and down rapidly at the same time.

B. Problems of the configuration to release the brake of the motor Because a speed reduction mechanism is provided between the output shaft and the motor,
Even if a large torque is applied to the output shaft, it can be released relatively easily (with a small force). However, when the load of the spring of the winding shaft and the load of the shutter curtain are balanced, the inertia, caulking torque, frictional force, etc. of the rotor inside the motor are increased by the speed reduction mechanism and work as brake torque. Power was needed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can release the connection between an electric motor with a brake configured to operate a brake when a rotating shaft stops and an output shaft with a small force. It is an object of the present invention to provide a clutch release device for a motor with a brake, which can reduce an impact sound during operation.

[0006]

In order to achieve the above object, a clutch release device for a motor with a brake according to the present invention is provided.
In order to keep the output shaft in a fixed rotation state even when there is a rotational load from the output shaft side at the time of rotation stop, the clutch release of the brake-equipped motor having the brake mechanism 2 for applying a brake to the rotation shaft connected to the output shaft In the apparatus, a clutch mechanism 4 is provided between the electric motor 1 and the output shaft, and is capable of connecting or releasing the rotating shaft and the output shaft of the electric motor 1 by moving the clutch plate 16, and releasing the brake of the electric motor 1 in the brake releasing direction. Release mechanism 21 for moving to
And a clutch release mechanism 27 for moving the clutch plate 16 provided in the clutch mechanism 4 in a clutch release direction. After releasing the brake by the brake release mechanism 21, the clutch by the clutch release mechanism 27 is released. It is characterized by being released.

Further, the brake release mechanism 21 includes a release arm 22 for moving the brake plate 10 provided on the brake in a release direction, and a manual movement connected to the release arm 22. The clutch release mechanism 27 comprises a release operation means 30 for operating the clutch.
Can be constituted by a release arm 28 provided in the clutch mechanism 4 for moving the clutch plate 16 in a release direction, and a release operation means 30 connected to the release arm 28 for manual movement operation.

Further, the release operating means 30 includes a release cable 30a having a predetermined length connected to the release arms 22 and 28 at one end, and the other end of the release cable 30a. And an operating lever for manually applying a force to move the release arms 22 and 28 via the release cable 30a.

Further, the release operation means 30 may include a release cable 30 having a predetermined length and one end connected to the release arm 22 of the brake release mechanism 21.
a, and an operating lever provided at the other end of the release cable 30a for manually applying a force to move the release arm 22 via the release cable 30a, and releasing the brake release mechanism 21. An elastic body 34 having a predetermined spring force is provided between the arm 22 and the release arm 28 of the clutch mechanism 4, and the brake is released by the brake release mechanism 21 by manual operation of the operation lever. Thereafter, the clutch may be released by the clutch release mechanism 27.

Further, the clutch mechanism is connected to an output shaft by supporting a plurality of planetary gears 42 and 43 for reducing the rotation of the rotating shaft of the electric motor 1 at a predetermined ratio. Rotating disks 42a, 43a and a gear 44a formed in a substantially cylindrical shape and having an inner peripheral surface meshing with the planetary gears 42, 43
And an internal gear 44 for releasing engagement with the planetary gears 42, 43 due to axial movement of the planetary gears 42, 43, and the release operating means 30 is provided with the internal gear 4
4, and the reduction gear mechanism 40 may be configured to release the connection between the electric motor 1 and the output shaft by the movement of the internal gear 44.

The output shafts of the clutch mechanisms 4 and 40 may be connected to a winding shaft of an opening / closing body for opening and closing the opening.

Further, a take-up shaft of a shutter which can move up and down an opening is connected to an output shaft of the clutch mechanism 4, 40, and the opening / closing position of the shutter is connected to the take-up shaft. Regardless of the above, a configuration may be adopted in which an equilibrium spring for maintaining the stopped state when stopped is provided.

The operation of the above configuration will be described. When the electric motor 1 is stopped, the rotating shaft is fixedly held by the brake mechanism 2, and when the electric motor 1 is operated, the brake is released. When rotating the rotating shaft in a state where power is not supplied to the electric motor 1 such as during a power failure or an emergency, the brake plate 10 is moved via the release lever 22 of the brake release mechanism 21 by operating the operation lever and pulling the release cable 30a. And release the brake. The release lever 28 of the clutch release mechanism 27 is connected to the release lever 22 of the brake release mechanism 21 via an elastic body 34 having a predetermined spring force, and the torque applied to the output shaft (side) after the brake is released. Can be disengaged when is less than a predetermined value.

[0014]

FIG. 1 is a side view showing a first embodiment of a clutch release device for a motor with a brake according to the present invention. The configuration will be described with reference to FIG. The electric motor 1
It is a tubular motor that opens and closes a lightweight opening and closing body such as a window shutter. The electric motor 1 is provided with a brake mechanism 2. The rotation shaft of the electric motor 1 is connected to the rotation shaft of the clutch mechanism 4 via the speed reduction mechanism 3. Reduction mechanism 3
Is provided with a reduction gear therein to reduce the rotation of the electric motor 1 and output the same to the clutch mechanism 4. The output shaft side of the clutch mechanism 4 is connected to a winding shaft (not shown) that winds the shutter curtain, and the winding shaft is connected to or released from the electric motor 1 by the clutch operation of the clutch mechanism 4.

The brake mechanism 2 is constituted by an electromagnetic brake and moves a brake plate 10 in conjunction with the operation of the electric motor 1 to switch the rotation of the rotating shaft of the electric motor 1 so as to be fixed or rotatable. The brake plate 10 is urged by a spring 11 in a direction in contact with the friction plate 12, and when the electric motor 1 rotates, the electromagnetic force of the electromagnetic coil acts to separate the brake plate 10 from the friction plate 12 and release the brake.
When the electric motor 1 rotates, the electromagnetic force of the electromagnetic coil is released, and the brake plate 10 comes into contact with the friction plate 12 to apply a brake by the urging force of the spring 11. The brake plate 10 is configured so that the brake can be released by moving about 1 mm.

The clutch mechanism 4 includes a fixed plate 15 fixed to the take-up shaft, and a clutch plate 16 which can be freely connected to or released from the fixed plate 15 by insertion and removal. The clutch plate 16 mechanically connects between the electric motor 1 and the winding shaft (output shaft) to constitute a connecting means for transmitting or disconnecting the driving force. This clutch plate 16 is the brake plate 1
It is configured to be released by a movement amount at least larger than the movement amount of zero. A plurality of insertion grooves 15a are formed in the fixing plate 15 in the circumferential direction, and the clutch plate 16 is formed with engagement projections 16a to be inserted into and removed from the insertion grooves 15a.
A spring 17 is provided between the clutch plate 16 and the speed reduction mechanism 3.
Is inserted, and the clutch plate 16 is constantly urged in the direction of the fixed plate 15.

The brake mechanism 2 and the clutch mechanism 4
The brake and the clutch can be released by the release mechanism 20, respectively. Release mechanism 20
Is composed of a brake release mechanism 21 for releasing the brake plate 10 of the brake mechanism 2 and a clutch release mechanism 27 for releasing the clutch plate 16 of the clutch mechanism 4. The brake release mechanism 21 includes a release arm 22
Is pivotally supported about one end 22a by sliding the other end 22b. A connection arm 23 is connected and fixed between a predetermined length position of the release arm 22 and the brake plate 10. Clutch release mechanism 2
Reference numeral 7 denotes a bending portion 28c of a release arm 28 bent substantially in a V-shape, and is pivotally supported around the bending portion 28c by sliding the other end 28b. One end 28a
Are connected and fixed to the clutch plate 16.

The other ends 22b, 28b of the release arms 22, 28 of the brake release mechanism 21 and the clutch release mechanism 27, respectively.
Is positioned parallel to the direction of the rotation axis of the electric motor 1, and a release cable 3 is provided on a line connecting the other ends 22 b and 28 b.
0 is provided. The release cable 30 is provided with a slidable cable 30a in an outer cover 30b, and the outer cover 30b is fixed to the device via a fixture 31.
One end of the cable 30a is connected to the other end 22b of the release arm 22.
And the other end is connected to an operation lever (not shown). These operating lever and release cable 30
Constitutes the release operation means. An elastic body 34 having a predetermined elastic force is provided between the other ends 22b and 28b of the release arms 22 and 28. In the illustrated example, the elastic body 34 is constituted by a coil spring having a predetermined spring force. The coil spring 34 has at least an elastic force (spring force) greater than that of the spring 17 provided in the clutch release mechanism 27.

Next, the operation of the apparatus having the above configuration will be described. In the normal state, as shown in FIG. 1A, the clutch plate 16 of the clutch mechanism 4 is in contact with and fixed to the fixed plate 15, and this state is held by the spring 7. When the electric motor 1 rotates, the brake plate 10 of the brake mechanism 2 separates from the friction plate 12 and the brake is released. When the electric motor 1 stops, the brake plate 10 comes into contact with the friction plate 12 and the brake operates. With this braking force, the shutter curtain is kept stopped.

When the supply of electric power to the motor 1 is stopped (at the time of power failure or emergency), the shutter curtain is manually opened and closed. To open and close the shutter curtain,
It is necessary to release the brake of the brake mechanism 2 and / or the clutch of the clutch mechanism 4.
First, when the operator operates an operation lever (not shown), the cable 30a of the release cable 30 is pulled.

As a result, as shown in FIG. 1B, the cable 30a slides in the direction A in the figure, and pulls the release lever 22 of the brake release mechanism 21 in the same direction. The release lever 22 swings around one end 22a, and the friction plate 12
Release the brake plate 10 from. As a result, the rotating shaft of the electric motor 1 is in a free state, and the coking torque of the electric motor 1,
The output shaft (winding shaft) starts to rotate slowly due to the reduction ratio (frictional force) of the reduction mechanism 3. That is, the shutter curtain slowly moves up and down by the spring force of the balancing spring until the balancing spring provided on the winding shaft is in a balanced state.

In the state where the brake of the brake mechanism 2 is released as shown in FIG.
Clutch is not released. That is, the spring force of the spring 17 of the clutch mechanism 4 and the clutch plate 1
In contrast to the engaging force of No. 6, the pulling force is weak, and only the coil spring 34 is in an extended state. After this, the cable 30
The electric motor 1 with the brake released in the state where a is pulled
Is rotated and the torque applied to the output shaft is reduced to a predetermined value or less, the clutch plate 16 of the clutch mechanism 4
5 (see FIG. 1 (c)). The connection and release of the clutch plate 16 and the fixed plate 15 have the following conditions. Fixing plate 15
When the clutch plate 16 is connected to the motor → torque applied to the output shaft + spring force (compression) of the spring 17 ≧ coil spring 34
When the clutch plate 16 is released from the fixed plate 15 → torque applied to the output shaft + spring force (compression) of the spring 17 <spring force of the coil spring 34 (tension). When separated, the engagement protrusion 16a of the clutch plate 16 comes out of the insertion groove 15a of the fixed plate 15. The clutch plate 16 is connected to the brake mechanism 2.
After the brake is released, the electric motor 1 rotates until the torque applied to the output shaft is reduced, and is released when the torque becomes equal to or less than a predetermined value (the predetermined torque released is the spring force of the coil spring 34 (tension). )).
Thus, at the time of releasing the clutch of the clutch mechanism 4, the winding shaft rotates in the direction in which the load of the shutter curtain is balanced by the balancing spring, and the torque applied to the output shaft is reduced. Yes, the release sound can be lowered. Further, it is possible to prevent the shutter curtain from rapidly moving up and down when the clutch is released. After releasing the clutch, the operator can manually open and close the shutter curtain.

Next, FIG. 2 is a side view showing a second embodiment of the present invention. The configuration will be described with reference to FIG. 2A. In this embodiment, a speed reduction clutch mechanism 4 having the functions of the speed reduction mechanism 3 and the clutch mechanism 4 of the embodiment is described.
0 is provided. The deceleration clutch mechanism 40 is configured to decelerate the rotation of the rotating shaft of the electric motor 1 and connect or release the rotation to an output shaft (winding shaft). The reduction clutch mechanism 40 includes a gear 41 formed on the peripheral surface of the rotating shaft of the electric motor 1, a plurality of stages of planetary gears 42 and 43 meshing with the gear 41, and a cylindrical gear 4 on the inner peripheral surface.
It is composed of an internal gear (internal gear) 44 having 4a. The internal gear 44 has a push-back spring 17a (FIG. 1).
The internal gear 44 is urged to return to the initial state of FIG. 2A.

The illustrated planetary gears 42 are respectively supported at three positions at equal angles in the circumferential direction of the rotating disk 42a, and one of the gear surfaces meshes with the gear 41 and the other faces the gear 44a of the internal gear 44. They are meshed. As a result, the rotation of the rotating shaft of the electric motor 1 causes the rotating disk 42 a that supports the planetary gear 42 to rotate at a predetermined reduction ratio in the circumferential direction inside the internal gear 44. A gear 42c is provided at the center of the rotating disk 42a, and meshes with the planetary gear 43 of the next stage. Planetary gear 4
3 also has the same configuration as the planetary gear 42, and rotates the rotating disk 43c by reducing the rotation of the gear 42c at a predetermined ratio. The reduction clutch mechanism 40 outputs the rotation of the electric motor 1 to the output shaft at a two-stage reduction ratio.

The internal gear 44 has a structure fixed in the rotating direction and slidable in the axial direction. The end of the coil spring 34 is connected to the internal gear 44, and is slidable by operating the release cable 30. That is, as shown in FIG. 2B, when the cable 30a is pulled in the same manner as in the above embodiment, the brake of the brake plate 10 is released by the brake release mechanism 21. Thereafter, as shown in FIG. 2C, the pulling force of the cable 30a causes the internal gear 44 to slide in the direction A in FIG. This sliding amount is set to at least a length at which the internal gear 44 releases the meshing state with the planetary gear 43. By sliding the internal gear 44, the motor 1 side and
The connection with the output shaft (winding shaft) is released at the planetary gear 43 portion. That is, the internal gear 44 constitutes a connecting means for connecting or disconnecting the driving force between the electric motor 1 and the output shaft.

Also in this embodiment, after the brake of the brake mechanism 2 is released, the motor 1 rotates until the torque applied to the output shaft is reduced, and the deceleration clutch mechanism 40 is released when the torque falls below a predetermined value. Will be.
That is, when the brake of the brake mechanism 2 is released, the rotating shaft of the electric motor 1 is in a free state, and depending on the coking torque of the electric motor 1 and the reduction ratio (frictional force) of the reduction clutch mechanism 40,
The output shaft (winding shaft) slowly starts rotating to a position where the balancing spring is in a balanced state, and the shutter curtain slowly moves up and down due to the spring force of the balancing spring. Therefore, at the time of releasing the clutch of the deceleration clutch mechanism 40, the winding shaft rotates in the direction in which the load of the shutter curtain is balanced by the balancing spring, and the torque applied to the output shaft is reduced. You can do it, and the sound when releasing can be reduced. Further, it is possible to prevent the shutter curtain from rapidly moving up and down when the clutch is released. After releasing the clutch, the operator can manually open and close the shutter curtain.

In the above embodiment, after the brake of the brake mechanism 2 is released by operating one release cable 30, the clutch mechanism 4 (or the deceleration clutch mechanism 40) is released.
Although the configuration for releasing the clutch has been described, a configuration in which one release cable 30 is provided for each of the brake mechanism 2 and the clutch mechanism 4 may be employed. In this case, as the operation procedure, the release cable 3 on the brake mechanism 2 side is used.
After releasing the brake by operating 0, the release cable 30 on the clutch mechanism 4 side is operated to release the clutch.
In this configuration, the configuration of the coil spring 34 can be omitted.

The opening and closing member described in the above embodiment can be applied to a slit shutter in which a slit is formed in each slat, in addition to a shutter having a closed shutter such as a window shutter. In particular, in those shutters in which a winding spring is provided with a balancing spring on the winding shaft, the connection state between the electric motor 1 and the winding shaft is changed regardless of the change in the spring balance of the balancing spring. The shutter can be easily released, and the shutter can be easily opened and closed manually. Further, the output shaft side is not limited to the winding shaft of the opening / closing body, and in a configuration in which the output shaft may apply a load to the motor in the rotational direction, the output shaft and the motor with brake may be used. It can be widely applied as a mechanism for releasing the connection between the two.

[0029]

According to the present invention, in a configuration in which a brake-equipped motor configured to operate the brake when the rotating shaft stops is connected to the output shaft via a clutch mechanism, the brake is applied even when the motor is stopped. Since the clutch is released after being released, even when power is not supplied to the motor, the connection between the motor and the output shaft can be released with a small force, and the impact noise during operation can be reduced. . In a configuration in which the output shaft is connected to a take-up shaft of a shutter that can move up and down, the shutter curtain is opened and closed by rotation of the take-up shaft, and a balance spring is provided on the take-up shaft. Even if the spring balance of the spring is lost when the motor is stopped, the brake is released first, and the release of the brake releases the clutch after the shutter moves up and down to the position where the spring balance of the spring is balanced. Release can be easily performed with a small force. As a result, the shutter can be easily opened and closed manually in the event of a power failure or emergency. Since the brake and the clutch are released by the brake release mechanism and the clutch release mechanism, respectively, the release operation means for operating each release mechanism may be configured to perform an operation of releasing the clutch after the brake, or The release operating means is configured to release the clutch after releasing the brake.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a clutch release device for a motor with a brake according to the present invention.

FIG. 2 is a diagram showing a second embodiment of the device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric motor, 2 ... Brake mechanism, 3 ... Deceleration mechanism, 4 ... Clutch mechanism, 10 ... Brake plate, 16 ... Clutch plate, 2
1: brake release mechanism, 27: clutch release mechanism, 30
... release cable, 34 ... coil spring, 40 ... deceleration clutch mechanism.

Claims (7)

[Claims] 1. A brake equipped with a brake mechanism for applying a brake to a rotating shaft connected to the output shaft in order to keep the output shaft in a fixed rotation state even when there is a rotational load from the output shaft side when the rotation is stopped. In a clutch release device for an electric motor, a clutch mechanism that is provided between the electric motor and an output shaft and that can freely connect or release the rotation shaft and the output shaft of the electric motor by moving a clutch plate; A clutch release mechanism for moving the clutch plate provided in the clutch mechanism in a clutch release direction; and after releasing the brake by the brake release mechanism, the clutch release mechanism. A clutch release device for an electric motor with a brake, characterized in that the clutch is released by a clutch. 2. The brake release mechanism includes a release arm for moving a brake plate provided on the brake in a release direction, and a release operation means connected to the release arm for manually moving operation. 2. The clutch release mechanism according to claim 1, wherein the clutch release mechanism includes a release arm for moving a clutch plate provided in the clutch mechanism in a release direction, and a release operation means connected to the release arm for manual movement operation. A clutch release device for an electric motor with a brake as described in the above. 3. The release operating means includes a release cable having a predetermined length connected to the release arm at one end, and a release cable provided at the other end of the release cable and manually operated via the release cable. 3. The clutch release device for an electric motor with a brake according to claim 2, comprising an operation lever for applying a force for moving the clutch. 4. The release operation means includes a release cable having a predetermined length connected to a release arm of the brake release mechanism, and a release cable provided at the other end of the release cable, which is manually operated via the release cable. And an operating lever for applying a force to move the release arm. An elastic body having a predetermined spring force is provided between the release arm of the brake release mechanism and the release arm of the clutch mechanism. The clutch according to claim 2, wherein the clutch is released by the clutch release mechanism after the brake is released by the brake release mechanism by manual operation of the operation lever. Release device. 5. The clutch mechanism according to claim 1, wherein the clutch mechanism is configured to support a plurality of planetary gears for reducing the rotation of the rotating shaft of the electric motor at a predetermined ratio, and the rotating mechanism is connected to an output shaft. A gear that meshes with the planetary gear on a surface thereof, and an internal gear that is released from meshing with the planetary gear by axial movement of the planetary gear; The clutch releasing device for a motor with a brake according to claim 1, wherein the clutch releasing device is a reduction clutch mechanism that is connected to the gear and that releases the connection between the motor and the output shaft by movement of the internal gear. 6. An output shaft of the clutch mechanism is connected to a winding shaft of an opening / closing body that opens and closes an opening.
6. A clutch release device for an electric motor with a brake according to any one of claims 5 to 5. 7. An output shaft of the clutch mechanism is connected to a take-up shaft of a shutter which can move up and down an opening portion, and the stop shaft is maintained at the stop state regardless of the open / close position of the shutter. The clutch release device for an electric motor with a brake according to any one of claims 1 to 5, further comprising a balance spring.