JP5478398B2 - Automatic return type automatic closing device - Google Patents

Description

The present invention relates to an automatic closing device in a shutter device.

Conventionally, a so-called harm prevention interlocking repeater is known as an electric shutter control device. In the event of a fire, the interlocking repeater for hazard prevention uses a self-closing device to lower the weight of the shutter curtain to prevent the fire from spreading through an automatic closing device, and when an obstacle is detected during the weight drop of the shutter curtain. First, the weight drop of the shutter curtain is stopped via the evacuation stop device.

The interlocking repeater for hazard prevention usually uses a commercial power supply, and in the event of a power outage, various controls of the electric shutter are performed by supplying power from the battery power supply built into the interlocking relay for hazard prevention (the shutter curtain is lowered by the automatic closing device). However, when the energization-actuated automatic closing device is used, the energized state is maintained even during the weight reduction of the shutter curtain, so that there is a problem that the battery is easily consumed.

The present applicant has proposed an automatic closing device that operates by instantaneous energization to release the brake of the switch and to return the released brake (Patent Document 1). However, since the apparatus of Patent Document 1 uses a motor and an electromagnetic clutch (electromagnetic brake), there is a problem that the structure is complicated by requiring a plurality of drive circuits. Also, one of the purposes of returning the released brake is to urgently stop the lowering of the weight of the shutter curtain when an obstacle is detected during the lowering of the weight of the shutter curtain. It was requested.
JP2007-77719

The present invention provides an automatic closing device that has a simple structure and an extremely smooth return operation while being operated by instantaneous energization to release the brake of the switch and to return the released brake. It is for the purpose.

The automatic closing device adopted by the present invention is:
A motor having a motor shaft capable of rotating in the forward and reverse directions in the first direction or the second direction;
A one-way comprising a drive shaft that is in a rotation transmission state with the motor shaft only when the motor shaft rotates in the first direction, and the rotation transmission state is released by rotation in the second direction of the motor shaft Clutch,
A pinion that rotates integrally with the drive shaft of the one-way clutch,
A rack that meshes with the pinion and can reciprocate with the rotation of the pinion;
A brake lever release body that can reciprocate in the direction of releasing the brake or returning the brake, and moves together with the rack;
A main shaft for guiding the reciprocation of the rack and brake lever release body;
A return spring that is externally mounted on the main shaft and accumulates a force in a direction to return the brake by moving the brake lever release body in the brake release direction;
Means for shutting off power to the motor when the brake lever releaser moves in the brake release direction and releases the brake;
With
When the motor shaft rotates in the first direction by the brake release signal, the rotation of the motor shaft is transmitted to the drive shaft, and the brake lever release body moves in the brake release direction along the main shaft via the pinion and rack. And releasing the brake, and in the non-energized state after the power supply to the motor is cut off, the brake released state is maintained by restricting the rotation of the motor shaft in the rotation transmission state with the drive shaft,
When the motor is rotated in the second direction by the brake return signal, the rotation transmission state between the motor shaft and the drive shaft is released, and the drive shaft can be rotated independently from the motor shaft. The brake lever release body moves in the brake return direction along the main shaft by the force of the return spring, and the brake is returned.

In one aspect, the main shaft is provided with a shock-absorbing spring that moves together with the rack and the brake lever release body, and the movable amount of the brake lever release body that moves in the brake release direction is determined by the brake lever of the switch. When the amount of movement is larger than the amount of movement necessary for releasing, the buffering spring is contracted to absorb the amount of movement of the brake lever releasing body.

  The automatic closing device according to the present invention employs a one-way clutch that transmits a force in conjunction with the rotation of the motor shaft in the first direction and instantaneously disengages the clutch by the rotation of the motor shaft in the second direction. Brake release and return are performed by instantaneous energization of the motor in the forward and reverse directions, reducing power consumption during operation, simplifying the drive circuit, and reciprocating movement of the rack and brake lever release body Since the return spring is mounted on the main shaft for guiding the automatic closing device, the return operation of the automatic closing device is smoothly performed.

In the invention described in claim 2, even when the movement amount of the brake lever release body is set to be larger than the operation stroke of the brake lever necessary for releasing the brake lever of the switch, When a force greater than the force at the time of releasing the brake lever of the switch is applied to the moving brake lever release body, the buffer spring is contracted to absorb the amount of movement of the brake lever release body. The brake lever will not be damaged.
Therefore, a plurality of modes with different operation strokes in one type of automatic closing device (for example, when the release stroke of one type of switch is performed using a brake lever release body or a brake release wire, and the movement strokes of the two are different Or when applied to a plurality of switches having different operation strokes).

It is a whole perspective view of the electric shutter which adopted the control device of the present invention. It is a block diagram which shows the connection state of a control apparatus. It is a figure which shows the automatic closure apparatus which concerns on this invention. 1 is a schematic perspective view of an automatic closing device according to the present invention. It is a fragmentary figure which shows the inside of the schematic perspective view shown in FIG. It is a disassembled perspective view of a one-way clutch. It is explanatory drawing of the releasing operation | movement of the automatic closing apparatus which concerns on this invention, and a return operation | movement.

[A] Overall Configuration of Shutter Device First, the overall configuration of the shutter device in which the automatic closing device according to the present invention is adopted will be described. 1 and 2, reference numeral 1 denotes an electric shutter installed in an opening. A shutter curtain 2 constituting the electric shutter 1 is guided by guide rails 3 and 3 having both edge portions provided on both sides of the opening. In this state, it is changed into a closed posture in which the opening is lifted up and down to close the opening, and a storage posture in which the opening is opened by being wound in a shutter case (not shown) provided on the ceiling back 4 above the opening. It is configured to be visible.

An opening / closing device 5 for moving the shutter curtain 2 up and down by rotating a winding shaft (not shown) is disposed on the ceiling 4. The opening / closing device 5 includes a shutter control panel 5 a and a fully opened state of the shutter curtain 2. A limit switch 6 for detecting the fully closed state and an automatic closing device 8 for dropping the shutter curtain 2 by its own weight based on a signal output by the fire detection of the smoke detector 7 are provided. A disaster prevention panel 10 and a manual operation unit 11 are disposed on the walls 9 and 9 located on the sides of the guide rails 3 and 3. The switch 5 (shutter control panel 5a), the limit switch 6, the automatic closing device 8, the disaster prevention panel 10, and the manual operation unit 11 are connected to a control device (hazard prevention interlocking repeater) 12 that is also disposed on the ceiling 4. The controller 12 is connected via a connector cable, and controls various opening / closing controls of the shutter device. The control device 12 controls the opening / closing device 5 through the shutter control panel 5a by the operation from the manual operation unit 11, and moves the shutter curtain 2 up and down. Further, in the event of a fire, the control device 12 releases the brake of the switch 5 via the automatic closing device 8 based on the signals from the smoke detector 7 and the disaster prevention panel 10 and lowers the shutter curtain 2 by its own weight. When the fire is prevented from spreading and an obstacle is detected while the shutter curtain 2 is descending, the descent of the shutter curtain 2 is stopped by wired obstacle detection as described below.

The seat plate 2a provided at the lowermost end of the shutter curtain 2 has a seat plate switch 2b, and when there is an obstacle below the shutter curtain 2 during the lowering operation, this is connected to the seat plate switch 2b. It detects by contact, transmits an obstacle detection signal to the control device 12 through the signal line 2c, and stops the descent of the shutter curtain 2 via the shutter control panel. When the shutter curtain 2 is falling under its own weight, the released brake returns based on the obstacle detection signal. After the obstacle is removed, the shutter curtain 2 starts to descend again. The signal line 2c connected to the seat plate switch 2b is wound around the cord reel 13 mounted at the upper end of the opening while holding the urging force in the winding direction. The signal line 2c is wound around the cord reel 13 or is fed out with the up-and-down driving.

The control device 12 has a built-in battery power supply 14 to ensure control operation during a power failure, in addition to the commercial power source during normal operation. However, the shutter curtain 2 can be lowered by the battery power source 14 via the automatic closing device 8 based on the fire detection signal.

As shown in FIG. 2, the manual operation unit 11 includes a vertical rectangular front surface 15 and a panel 15 a provided in the front surface 15. A plastic cover 16 labeled “push” is provided below the front surface portion 15, and an openable / closable door 17 with a key that can be opened and closed is provided above the plastic cover 16. An emergency operation switch is disposed on the inner side of the plastic cover 16. The panel 15a is concealed by the open / close door 17. The panel 15a is provided with an up switch 18, a down switch 19 and a stop switch 20, and a disaster prevention system is provided on the side of these switches. A recovery switch 21 for returning the control device 12 of the electric shutter 1 that has been switched to the automatic closing mode upon receiving a disaster prevention signal input from the panel 10 to a normal manual operation mode, and a light emitting LED 22 as a light emitting unit are provided. ing. The voltage state of the battery power supply 14 is displayed on the light emitting LED 22. A transparent window 17a is formed in the keyed opening / closing door 17 at a position corresponding to the light emitting LED 22, so that the light emission state of the light emitting LED 22 can be confirmed through the transparent window 17a even when the keyed opening / closing door 17 is closed. It has become. In this way, the manual operation unit 11 has a function as a battery checker.

[B] Automatic closing device [B-1] Configuration of automatic closing device The automatic closing device 8 will be described. In the opening / closing control of the shutter device, when the control device (danger prevention interlocking repeater) 12 receives a fire signal from the disaster prevention panel 10, the control device 12 enters the automatic closing mode and is automatically closed by energization from the control device 12. The device 8 is actuated to release the brake part of the switch 5 and the shutter 2 is lowered to partition the fire prevention area. The automatic closing device 8 releases the brake part of the opening / closing machine 5 by a plurality of mechanical elements that operate in conjunction with the rotation of the motor 80, and immediately shuts off the power to the motor 80 after releasing the brake.

As shown in FIGS. 3 and 4, the automatic closing device 8 includes a box-shaped casing 8a, and a plurality of mechanical elements are provided in the casing 8a. Specifically, the mechanical elements constituting the automatic closing device 8 include a motor 80, a one-way clutch 81, a pinion 82 that is connected to the motor 80 via the one-way clutch 81, a rack 83 that meshes with the pinion 82, and a rack 83. Brake lever release body 84 that moves with movement, main shaft 85 that guides the brake lever release body 84 in the axial direction, and two compression springs (buffer springs) that are respectively sheathed on the main shaft 85 across the brake lever release body 84 86A, return spring 86B) and three micro switches 87A, 87B, 87C that enter after the brake lever is released.

The three micro switches 87A, 87B, and 87C are mounted on the relay board 88, and the switch is turned on when the switch lever 89A that moves together with the brake lever releaser 84 comes into contact with the movement of the rack 83. When the micro switch 87A is turned on, output to the control device (hazard prevention interlocking relay) is performed, and it is confirmed that the brake is released with the output. When the micro switch 87B is turned on, the external device (automatic closing device) Is output to a device set in advance so as to operate in conjunction with the release of the brake (the use of the micro switch 87B is optional), and when the micro switch 87C is turned on, the motor 80 is energized. Blocked.

The automatic closing device 8 further includes a wire fixing bracket 89B that moves together with the brake lever release body 84 as the rack 83 moves. If necessary, the brake releaser 84 may be replaced with a brake release wire 89C having an end fixed to the wire fixing bracket 89B so that the brake is released. In one aspect, the movement stroke of the brake lever release body 84 at the time of brake release is 14 mm, whereas the movement stroke of the brake release wire 89C is 20 mm, and the movement strokes of the two are different. In the illustrated embodiment, the switch lever 89A and the wire fixing bracket 89B are formed by bending the same plate material, but may be formed of different members. Further, the switch lever 89A and the wire fixing bracket 89B may be integrally formed from the same member as the brake lever release body 84.

The brake lever release body 84 can reciprocate on the main shaft 85 between the direction of releasing the brake and the direction of returning the brake by the reciprocation of the rack 83. A long hole 80a is formed in the bottom surface of the casing 8a and is located below the main shaft 85 and extends in the moving direction of the rack 83 and the brake lever release body 84. The brake lever 50 for releasing the brake portion of the opening / closing machine 5 is long. It extends upward (in the embodiment of FIG. 4) from the hole 80a. The brake lever moves in the brake release direction (right direction in FIGS. 4 and 5) in the length direction of the long hole 80a, so that the brake of the switch 5 is released, and the brake return direction opposite to the brake release direction (see FIG. 4, the brake of the opening / closing machine 5 is restored by moving in the left direction in FIG. The brake lever 50 is urged in a direction in which the brake returns by a spring (not shown). In the present embodiment, the brake lever 50 protrudes below the opening / closing machine 5 shown in FIG. 1, and the automatic closing device 8 is arranged below the opening / closing machine 5 in a mode that is upside down from the mode shown in FIG. It is attached. Further, the brake lever 50 is not only used when the automatic closing device 8 is connected to the opening / closing device 5 and the shutter is lowered by its own weight in the event of a fire, but the connection of the automatic closing device 8 is not required, that is, needs to be closed in the event of a fire. In the case of a shutter with no shutter, the operator presses and operates the brake lever 50 with his / her finger to lower the shutter curtain by his / her hand, and the brake returns when the hand is released at an appropriate position. For example, it can be used to close the shutter curtain by dropping its weight to an appropriate height.

As shown in FIG. 5, the main shaft 85 extends horizontally between the first fixed portion 850 and the second fixed portion 851. The brake lever release body 84 is formed in a U-shape in a side view from a first piece 840 that rises, a second piece 841, and a bottom piece 842 that connects the first piece 840 and the second piece 841. The main shaft 85 can be reciprocated through insertion holes provided in the piece 840 and the second piece 841. The brake lever release body 84 is connected to the rack 83, and the brake lever release body 84 and the rack 83 are configured to reciprocate integrally. On the main shaft 85, a return spring 86B is located between the first fixing portion 850 and the first piece 840, and is located between the abutting portion 852 and the second piece 841 formed integrally with the rack 83. The buffer springs 86A are externally provided.

As shown in FIG. 6, the one-way clutch (roller clutch) 81 has a wheel 810 that rotates integrally with the motor shaft 800 of the motor 80 and a substantially equal interval in the circumferential direction along the inner peripheral surface of the wheel 810. A plurality of rollers 811 arranged, a clutch guide 812 that positions and holds the rollers 811 so that the circumferential position of the rollers 811 does not shift when the wheel 810 rotates, and a drive shaft 813 that transmits the rotation of the motor shaft 800 so that it can be turned on and off. It consists of.

The wheel 810 has a short cylindrical shape, and a connection hole 810a for receiving the motor shaft 800 in a state where rotation can be transmitted is formed on one surface portion, and the other side is open. The motor shaft 800 is coupled to the coupling hole 810a of the wheel 810 so as to rotate integrally, and the wheel 810 rotates in the forward / reverse direction in conjunction with the forward / reverse rotation of the motor shaft 800. That is, when the motor shaft 800 rotates in the first direction (A direction shown in FIG. 6), the wheel 810 also rotates in the first direction. When the motor shaft 800 rotates in a second direction opposite to the first direction (the B direction shown in FIG. 6), the wheel 810 also rotates in the second direction B.

The motor 80 is fixed to one side of a rising plate 801a of a mounting base 801 provided in the casing 8a, and the motor shaft 800 extends to the other side through the plate 801a. The one-way clutch 81 is provided on the other side of the plate 801a.

On the inner peripheral surface of the wheel 810, three guide surfaces 810A corresponding to each roller 811 are formed in the circumferential direction. Each guide surface 810A is a curved surface whose distance from the rotation center of the wheel 810 gradually decreases in the circumferential direction from one side (first end) in the circumferential direction to the other side (second end). (That is, the diameter is reduced) or an inclined surface. For example, in the modes shown in FIGS. 6 and 7, the guide surface 810A is a curved surface whose distance from the rotation center of the wheel 810 gradually decreases in the second direction (the B direction shown in FIG. 6). In a state where each roller 811 is at the first end of each guide surface 810A (FIG. 6), each roller 811 is guided toward the center in the radial direction by the guide surface 810A when the wheel 810 rotates in the A direction. The

The clutch guide 812 includes a ring-shaped main body 812A and three arc-shaped positioning pieces 812B formed in the circumferential direction of the main body 812A, and the interval between the adjacent arc-shaped positioning pieces 812B in the circumferential direction is a roller. The dimensions are slightly larger than the diameter of 811. In other words, the circumferential length of each arcuate positioning piece 812B is slightly smaller than the circumferential spacing between the rollers 811. The other open side of the wheel 810 is closed by a not-shown lid (having an insertion hole for the drive shaft 813), and the other end of the main body 812A of the clutch guide 812 (the positioning piece 812B is formed). The end portion opposite to the side that is provided is in pressure contact with the inner wall of the lid through an O-ring (not shown), and the rotation of the clutch guide 812 is restricted.

The movement of the three rollers 811 in the circumferential direction is restricted by the positioning pieces 812B of the clutch guide 812 at substantially equal intervals in the circumferential direction, and the wheels are in a state where each roller 811 is at the first end of each guide surface 810A. By rotating 810 in the first direction (A direction), each roller 811 is guided radially toward the rotation center of the wheel 810 by the guide surface 810A while the circumferential movement is restricted by the positioning piece 812B. Is done.

The drive shaft 813 includes a star-shaped engaging portion 813A on the proximal end side, a connecting portion 813B on the distal end side, and an intermediate large-diameter portion 813C, and extends along the center of rotation of the wheel 810. The peripheral surface of the engaging portion 813A is formed of a plurality of curved concave portions formed continuously in the circumferential direction, and each curved concave portion matches the diameter of the roller 811 so that the roller 811 can be engaged. It has become. The diameter of the engaging portion 813A, that is, the diameter of the circumscribed virtual circle on the peripheral surface of the engaging portion 813A is such that when the roller 811 is located at the first end of the guide surface 810A (the side far from the rotation center of the wheel 810) When the roller 811 is guided toward the center in the radial direction via the guide surface 810A due to the rotation of the wheel 810 in the A direction, the roller 811 is formed on the guide surface 810A. Moving to the second end (the side closer to the center of rotation of the wheel 810), the roller 811 engages with the curved recess of the engaging portion 813A so that the clutch is engaged.

In a state where the roller 811 is positioned at the second end portion (side closer to the rotation center of the wheel 810) of the guide surface 810A, the guide that is in contact with the roller 811 by the rotation of the wheel 810 in the second direction (B direction). The distance between the surface 810A and the center of the drive shaft 813 is increased, the curved concave portions of the roller 811 and the engagement portion 813A are separated, the engagement state is released, the clutch is disengaged, and the drive shaft 813 becomes free.

In this way, in the mechanical one-way clutch, the wheel 810 and the drive shaft 813 can be engaged / disengaged via the plurality of rollers 811. The engagement / disengagement of the clutch 810 and the drive shaft 813 via the roller 811 is as follows. This is done by rotating the motor shaft 800 and the clutch 810 in the forward and reverse directions (first direction or second direction). In a state where the wheel 810 and the drive shaft 813 are engaged via the roller 811, the drive shaft 813 rotates integrally with the rotation of the motor shaft 800 and the wheel 810. That is, in this state, the motor shaft 800 and the drive shaft 813 are in a rotation transmission state. When the wheel 810 and the drive shaft 813 are not engaged, the drive shaft 813 is in a free state independent of the motor shaft 800 and the clutch 810. In this state, the rotation transmission state between the motor shaft 800 and the drive shaft 813 is released, and the drive shaft 813 is independent of the motor shaft 800 and the clutch shaft 810 (more specifically, the motor shaft 800 and the clutch shaft 810). Without rotation from the motor shaft 800 and without being restricted by the motor shaft 800 and the clutch shaft 810 that are in a stationary state.

The pinion 82 is connected to the connecting portion 813B on the distal end side of the drive shaft 813 so as to rotate integrally, and the pinion 82 rotates as the drive shaft 813 rotates. By the rotation of the pinion 82 in the A direction, the rack 83 meshing with the pinion 82 moves straight in the brake release direction. A brake lever release body 84 is fixed to the rack 83, and the brake lever release body 84 starts to push the brake lever 50 of the opening / closing machine 5 as the rack 83 moves. When the brake lever release body 84 moves by a predetermined amount, when the micro switch 87A is turned on by contact with the switch lever 89A that moves together with the brake lever release body 84, an output to the control device (danger prevention interlocking relay) is performed. When the micro switch 87B is turned on, output to an external device is performed, and when the micro switch 87C is turned on, the power supply to the motor 80 is cut off.

When the rack 83 and the brake lever release body 84 move in the brake release direction, the contact portion 852 and the second piece 841 of the brake lever release body integrally formed with the rack 83 move in the brake release direction. When resistance exceeding the resistance at the time of normal brake release occurs in the first piece 840 of the brake lever release body that contacts the brake lever 50, that is, the movable amount of the brake lever release body 84 that moves in the brake release direction is When the amount of movement required to release the brake lever 50 of the opening / closing machine is larger, the amount of movement of the brake lever release body 84 in the brake release direction is set between the contact portion 852 and the second piece 841. The provided buffer spring 86A absorbs the shock. Therefore, when the automatic closing device according to the present embodiment is applied to a plurality of types of switches with different brake release strokes of the brake lever 50, the movement amount of the rack 83 and the brake lever release body 84 is the opening / closing with the largest stroke. However, when such an automatic closing device is used for an opening / closing device with a small stroke, the amount of movement of the brake lever release body 84 more than necessary accompanying the movement of the rack 83 is used for buffering. Since the spring 86A absorbs, there is no case where the brake lever 50 of the opening / closing machine is pushed by force and the brake lever 50 of the opening / closing machine is not damaged.

In a state where the energization to the motor 80 of the automatic closing device 8 is cut off, the drive shaft 813 of the one-way clutch 81 is in a rotation transmission state with the motor shaft 800 of the motor 80, and the motor 80 (deceleration in the present embodiment). The acceleration starting torque of the motor with the machine overcomes the spring force of the return spring 86B and the return force of the brake lever 50 (the return spring (not shown) built in the opening / closing machine), and the rotation of the pinion 82 and the rack 83 Movement is restricted and the brake released state is maintained. In this state, when an operation signal is transmitted from the control device 12 that has received the obstacle detection signal to the motor 80, the motor 80 rotates in the second direction (direction B), and the wheel 810 of the one-way clutch 81 moves to the first direction. Rotating in the direction 2 (B direction), the drive shaft 813 is instantly free and can be rotated, and the return force of the return spring 86B causes the rack 83 and the brake lever release body 84 to move in the brake return direction. The brake lever 50 of the opening / closing machine 5 is returned by a return spring (not shown), and the brake of the opening / closing machine 5 is returned. The acceleration starting torque is used to mean a torque necessary for starting the motor from the output side in a no-load state. That is, in the motor in a non-energized state, the rotation of the motor shaft is regulated by the acceleration starting torque. In addition, when the acceleration starting torque of the motor 80 is small, there is a possibility that the motor will be de-energized at the same time as the motor is cut off. Therefore, the speed reduction mechanism is used as a worm gear, and the carbon that always gives a constant braking force to the motor. You may employ | adopt the structure which adds a brake etc.

[B-2] Operation of the automatic closing device The operation of the automatic closing device will be described.
[B-2-1] Automatic Closure Device Release Operation (1) Upon receiving the disaster prevention signal, the control device (danger prevention interlocking repeater) 12 supplies an operation signal for brake release to the motor 80, and the motor shaft 800 Begins to rotate in the first direction.
(2) The wheel 810 of the one-way clutch 81 starts rotating in the first direction integrally with the rotation of the motor shaft 800.
(3) When the wheel 810 rotates in the first direction, each roller 811 positioned at the first end of the guide surface 810A (the movement in the circumferential direction is regulated by the positioning piece 812B) is changed to the guide surface 810A. And starts to move toward the rotation center of the wheel 810, engages with the curved concave portion of the engagement portion 813A of the drive shaft 813 passing through the rotation center of the wheel 810, and the drive shaft 813 rotates in the first direction. To start.
(4) As the drive shaft 813 rotates in the first direction, the pinion 82 fixed to the connecting portion 813B on the distal end side of the drive shaft 813 rotates in the first direction.
(5) By rotation of the pinion 82 in the first direction, the rack 83 meshing with the pinion 82 starts to move in the brake release direction, and the brake lever release body 84 connected to the rack 83 moves on the main shaft 85 in the brake release direction. Then, the opening / closing machine brake lever 50 is started to be pushed. Thereby, the brake of the opening / closing machine 5 is released.
(6) When the micro switch 87A is pushed by the switch lever 89A that moves integrally with the brake lever release body 84, output to the control device (danger prevention interlocking relay) is performed, and when the micro switch 87B is pushed, When output to an external device is performed and the micro switch 87C is pressed, the energization to the motor 80 is cut off and the motor 80 stops.
(7) Even after the motor 80 is de-energized, the drive shaft 813 of the one-way clutch 81 is in a state of transmitting rotation with the motor shaft 800 of the motor 80, and the rotation of the motor shaft 800 is restricted by the acceleration starting torque of the motor 80. Thus, the brake released state is maintained.

[B-2-2] Returning operation of the automatic closing device (1) Upon receiving the obstacle detection signal, the control device (hazard prevention interlocking relay) 12 sends an operation signal for returning the brake for a predetermined time (for example, by a timer). (About 3 seconds) is supplied to the motor 80, and the motor shaft 800 starts to rotate in the second direction.
(2) The wheel 810 of the one-way clutch 81 starts to rotate in the second direction integrally with the rotation of the motor shaft 800.
(3) When the wheel 810 rotates in the second direction, each roller 811 positioned at the second end of the guide surface 810A (the movement in the circumferential direction is regulated by the positioning piece 812B) is changed to the guide surface 810A. The guide shaft 813 moves away from the center of rotation of the wheel 810, the engagement state of the engagement portion 813A of the drive shaft 13 with the curved recess is instantaneously released, and the drive shaft 813 becomes free.
(4) The brake lever release body 84 and the rack 83 are pushed and moved in the brake return direction by the force of the return spring 86B compressed in the holding state of the brake released state, and instantly return to the original position. . The opening / closing machine brake lever 50 is also returned by the return spring (not shown) to return the brake. The operation from the input of the brake return operation signal to the return of the brake is performed in less than 1 second. Since the rack 83 and the brake lever release body 84 that reciprocate and the return spring 86B are provided on the same shaft (main shaft 85), the force of the return spring 86B is accurately transmitted to the brake lever release body 84 and the rack 83. Smooth return operation is performed. Note that the return of the rack 83 and the brake lever release body 84 is set to be performed only by the force of the return spring 86B without depending on the return spring (not shown) of the brake lever 50, and in this embodiment. Then, the position shown in the left side view of FIG. 3 is a return position (position before operation) of the brake lever 50 and the brake lever release body 84. The return of the brake lever 50 of the opening / closing machine 5 and the return of the automatic closing device 8 (brake lever release body 84) are independent operations, preventing problems that may occur when the devices interfere with each other.

As described above, the automatic closing device 8 according to the present invention transmits a force in conjunction with the rotation of the motor shaft 800 in the first direction, and the clutch is instantaneously released by the rotation of the motor shaft 800 in the second direction. By adopting the one-way clutch 81, the brake is released and returned by instantaneous energization of the motor 80 in the forward and reverse directions, greatly reducing power consumption during operation and simplifying the drive circuit. At the same time, the return spring 86B is externally mounted on the main shaft 85 for guiding the reciprocation of the rack 83 and the brake lever release body 84, so that the return operation of the automatic closing device 8 is performed smoothly.

The present invention can be used as an automatic closing device in an electric shutter.

2 Shutter curtain 8 Automatic closing device 80 Motor 800 Motor shaft 81 One-way clutch 82 Pinion 83 Rack 84 Brake lever release body 85 Main shaft 86B Return spring 12 Control device (Linkage relay for harm prevention)

Claims (2)

A motor having a motor shaft capable of rotating in the forward and reverse directions in the first direction or the second direction;
A one-way comprising a drive shaft that is in a rotation transmission state with the motor shaft only when the motor shaft rotates in the first direction, and the rotation transmission state is released by rotation in the second direction of the motor shaft Clutch,
A pinion that rotates integrally with the drive shaft of the one-way clutch,
A rack that meshes with the pinion and can reciprocate with the rotation of the pinion;
A brake lever release body that can reciprocate in the direction of releasing the brake or returning the brake, and moves together with the rack;
A main shaft for guiding the reciprocation of the rack and brake lever release body;
A return spring that is externally mounted on the main shaft and accumulates a force in a direction to return the brake by moving the brake lever release body in the brake release direction;
Means for shutting off power to the motor when the brake lever releaser moves in the brake release direction and releases the brake;
With
When the motor shaft rotates in the first direction by the brake release signal, the rotation of the motor shaft is transmitted to the drive shaft, and the brake lever release body moves in the brake release direction along the main shaft via the pinion and rack. And releasing the brake, and in the non-energized state after the power supply to the motor is cut off, the brake released state is maintained by restricting the rotation of the motor shaft in the rotation transmission state with the drive shaft,
When the motor is rotated in the second direction by the brake return signal, the rotation transmission state between the motor shaft and the drive shaft is released, and the drive shaft can be rotated independently from the motor shaft. The automatic closing device is configured such that the brake lever release body moves in the brake return direction along the main shaft by the force of the return spring, and the brake returns. The main shaft is covered with a buffering spring that moves together with the rack and the brake lever release body,
When the movable amount of the brake lever release body moving in the brake release direction is larger than the movement amount necessary for releasing the brake lever of the switch, the amount of movement of the brake lever release body is reduced when the buffer spring is contracted The self-closing device according to claim 1, wherein the automatic closing device is configured to absorb water.