JPS5819008B2 - Motor damper blade opening/closing device - Google Patents

Description

[Detailed Description of the Invention] Fire dampers are generally installed in the ventilation ducts of large buildings and apartment complexes, and when a fire occurs, the dampers are closed to prevent smoke and hot air from flowing to other rooms. It looks like this.

this. The invention relates to a device that is attached to such a damper to open and close the blades, and not only allows the damper blades to be opened and closed by remote control, but also automatically and reliably closes the blades in the event of a fire. The purpose of the present invention is to provide a vane opening/closing device that can perform the following functions.

Examples will be described below based on the drawings.

First, for convenience of explanation, a specific example of the invention described in item 2 of the claims will be explained.

Substrate 19 attached to the outer surface of damper casing 18:
A hollow main shaft 20 is rotatably but non-slidably mounted in the inside of the main shaft 20, and the end of the rotary shaft 1 provided with the vane plate 2 is inserted into the main shaft 20.

The upper end of the rotating shaft 1 protrudes upward beyond the upper end of the main shaft 20, and the protruding portion 21 at the upper end of the rotating shaft 1 has a shape.

The handle 22 is fixed.

A disk-shaped coupling plate 23 is fixed to the upper end of the main shaft 20, and this coupling plate 23 has an arc-shaped through hole 24 extending one-fourth of the circumference.

A bolt 25 is passed through the through hole 24 from below, and a threaded portion of the bolt 25 is inserted through the through hole 24 from below.

passes through a through hole 26 provided in the handle 22 and is fixed to the handle 22 by a wing nut 27.

Therefore, by loosening the wing nut 27, the handle 22 can rotate within a range of 90° with respect to the main shaft 20. Therefore, when the main shaft 20 is in the fully open position, the rotating shaft 1 fixed to the handle 22 In other words, the opening degree of the blade plate 2 attached to the rotating shaft 1 can be adjusted.

A pointer 28 is provided at the base end of the handle 22, and an angle scale 29 is provided on the coupling plate 23 over a quarter of the circumference.
is attached so that the opening degree of the blade plate 2 can be easily determined.

A torsion coil spring 30 is fitted in the lower part of the main shaft 20, and one end of this spring 30 is locked to the main shaft 20, and the other end is locked to the back surface of the substrate 19.

The torsion coil spring 30 is wound and installed at the bottom of the main shaft 20 in a state in which rotational force is stored, and constantly applies a rotational force (closing force) in the counterclockwise direction in FIG. 1 to the main shaft 20 and the rotating shaft 1. There is.

A large gear 31 is fitted to the main shaft 20 below the coupling plate 23, and an upper part 33 of an L-shaped engagement rod 32 whose base end is fixed to the main shaft 20 is an engagement member that is inserted through the large gear 31. Hole 3
4, the large gear 31 is fixed to the main shaft 20 in a non-rotatable manner.

Two stoppers 35 and 36 are fixedly installed on the upper surface of the base plate 19, and when a pin 37 projecting laterally from the main shaft 20 comes into contact with the stopper 35 or the stopper 36, the rotation range of the main shaft 20 is limited. It is limited to a range slightly larger than 90°.

A disk-shaped support plate 38 is fixed to the main shaft 20 below the engagement rod 32, and a fan-shaped cam 17 that projects laterally is fixed to the support plate 38.

An arc-shaped actuation plate 40 is further provided upright on the support plate 38, and microswitches 41 and 42 are located facing the position where the actuation plate 40 is located when the main shaft 20 is fully turned in the direction in which the blade plate 2 is opened. Yes, micro switch 41.42
is fixed to the substrate 19 via a support plate 43.

Near the bottom of the fan-shaped cam 17, there is a lever 10 whose center square is vertically rotatably supported by a shaft 44, and a locking protrusion 11 is erected at the upper left side of the lever 10. There is.

The position of the lever 10 is such that when the main shaft 20 is rotated to the fully open state, the locking protrusion 11 is further away from the clockwise edge 17A of the fan-shaped cam 17 in FIG. determined to be in position.

A torsion spring 12 is wound around a shaft 44 that pivotally supports the lever 10, and the torsion spring 12 always provides an elastic force in the direction in which the side of the lever 10 where the locking protrusion 11 is located rises. .

On the right side of the lever 10 is an arm 14 whose lower end is rotatably supported by a shaft 46, and inside this arm 14 there is an arm 14 that engages with the right end of the lever 10 to raise the right end of the lever 10. A lockable hook 13 is provided.

A vertically elongated engagement hole 47 is formed through the upper part of the arm 14, and the tip of a connecting rod 48 is inserted into the engaging hole 47, and the retaining hole 47 and the connecting rod 48 are connected with a nut 49. ing.

The base end of the connecting rod 48 is fixed to a plunger 50 of the solenoid 15, and the plunger 50 is always given an elastic force to the left in FIG. 5 by the compression spring 16.

Therefore, the arm 14 has a counterclockwise rotational force in FIG. 5, but when the solenoid 15 is energized, its plunger 50 slides to the right in FIG. The arm 14 is rotated clockwise in FIG. 5 via the rod 48.

In this embodiment, mainly by adding a thermally responsive member as shown in FIG. 2, the plunger 50 can be moved to the right in FIG. 5 without passing current through the solenoid 15.

This thermally responsive member is a known one, but to briefly explain, it has a sliding rod 52 in the tubular body 51 whose upper end protrudes above the tubular body 51. A spring (not shown) provided inside constantly applies a force that tends to bury the body downward.

However, a temperature fuse 53 is fitted between the lower end of the sliding rod 52 and the lower end of the tubular body 51, and unless this fuse melts, the sliding rod 52 will not descend.

A support plate 54 extends from the upper side of the tubular body 51, and an L-shaped arm 56 is rotatably provided above a shaft 55 erected on the support plate 54.

The arm 56 is given a counterclockwise rotational force in FIG. 1 by a torsion spring 57 wound around the shaft 55, but its rotation is limited by the upper end of the sliding rod 52.

To the left of the plunger 50 of the solenoid 15 is a cam 60 rotatably mounted on the case 59 by a shaft 58, and the tip of the cam 60 projects into the rotation area of the tip of the arm 56.

Furthermore, it is slidable between the left side of the plunger 50 and the cam 60.

A push rod 61 is provided.

Therefore, when the temperature fuse 53 in the tubular body 51 melts due to temperature rise, the sliding rod 52 moves downward and the arm 56 rotates, and the tip of the arm 56 pushes the cam 60 to rotate it, and the push rod Since the plunger 50 moves to the right in FIG. 5 via the arm 61, the arm 14 rotates clockwise in FIG. 5 in the same way as when the solenoid 15 is energized.

Next, the structure of the spring clutch A used in the embodiment of the present invention will be explained with reference mainly to FIG.

A coil spring 4 having an outer diameter slightly smaller than the inner diameter of the operating barrel 3 is inserted into the cylindrical operating barrel 3, and the upper end of the coil spring 4 is bent outward so that the bent portion 4A is not activated. It engages with a groove 3A formed on the upper edge of the cylinder 3.

A movable member 7 having an inner diameter slightly smaller than the outer diameter of the operating barrel 3 is fitted onto the outer periphery of the operating barrel 3 .

The movable member 7 in this embodiment is formed by winding a hard steel wire with a square cross section in a counterclockwise direction, and the movable member 7 is formed by winding a hard steel wire with a square cross section in a counterclockwise direction. For example, a play shoe having an axis may be used.

The coil spring 4 has a left-handed winding direction and is made of hard steel wire with a square cross section.

The lower portion of the driven shaft 6 has a cylindrical shape that is slightly smaller than the inner diameter of the coil spring 4, and this cylindrical portion 6A is fitted into the coil spring 4 from above.

The upper part of the driven shaft 6 has teeth that mesh with the large gear 31 to form a gear 6B, and a ring 62 is fixed in the inside of the driven shaft 6.

Both gears 6B. Needless to say, 31 functions as a transmission device B that transmits the rotation of the driven shaft 6 to the main shaft.

The drive shaft 5 has a cylindrical portion 5A having the same diameter as the cylindrical portion 6A of the driven shaft 6. The lower part of the cylindrical portion 5A has a stepped diameter, and the driven shaft 6 is attached to the upper part of the cylindrical portion 5A. A shaft 5B for rotatably supporting is provided in a protruding manner.

A vertical groove 5D is provided in the enlarged diameter portion 5C of the drive shaft 5,
A bent portion 4B, which is a downwardly bent portion of the lower end of the coil spring 4, is engaged in this groove 5D.

An E IJ link '63 is fitted onto the upper part of the shaft 5B of the drive shaft 5, and this prevents the driven shaft 6 from coming off.

Fitted into the lower part of the drive shaft 5 is an output shaft 64A of the reducer 64, and this shaft 64A is fixed to the drive shaft 5 with a set screw 65.

Next, the structure of the part that operates the spring clutch A will be explained.

A support plate 66 is fixed to the left side of the board 19,
A speed reducer 64 is fixed to the support plate 66.

The gear 6B of the driven shaft 6 meshes with the large gear 31, and the upper end of the shaft 5B of the drive shaft 5 is fitted with a bearing 6 fixed to a support plate 66.
It is supported by 7.

The motor 68 is fixed to the lower part of the reducer 64, and
An output shaft (not shown) of the motor 68 is connected to an input shaft (not shown) of the reducer 64.

A lever 69 is provided on the side of the spring clutch A, and the lower end of the lever 69 is supported by a shaft 70 so that the lever 69 can rotate in the front-rear direction.

In front of the lever 69 is an elastic body 8 which is a coil spring, and both ends of the elastic body 8 stand between a locking hole 71 penetrated through the inside of the lever 69 and a support plate 66 in front of the lever 69. It is locked in a locking hole 73 at the upper end of a locking plate 72 provided therein.

There is a solenoid 9 behind the lever 69, and this solenoid 9 is fixed to the base plate 19.

One end of a connecting plate 75 is connected to the tip of the plunger 74 of the solenoid 9 by a shaft 76, and the other end of the connecting plate 75 is connected to the upper end of the lever 69 by a shaft 77.

Another locking hole 78 is provided in the inside of the lever 69, and the outwardly bent portion 7A of the lower end of the movable member 7 is fitted and locked into this locking hole 78. There is.

Furthermore, in this embodiment, a locking plate 79 is rotatably provided on the upper part of the spring clutch A-.

The locking plate T9 has a round hole 80 at one end, and the teeth m fit into this round hole 8.
0 and is rotatable within this round hole 80.

The connecting plate 75 of this embodiment is L-shaped, and the upper end of its upright portion passes through an engagement hole 81 on the distal end side of the locking plate 79 and is then stopped by a shaft 82.

A locking piece 83 is provided upright on the side of the round hole 80, and the position of the locking piece 83 is such that when the solenoid 9 is in a de-energized state, the locking piece 83 is connected to the large gear 31 and the gear 6B. It is set so that it is in a position where you want to cut into the engaging part from the front.

A fan-shaped cam 84 is fixed to the periphery of the large gear 31, and a notch 85 is provided on one periphery of the cam 84.

A limit switch LSI is provided opposite the portion where the notch 85 is located when the main shaft 20 is rotated to the fully open position.

The limit switch LSI has a lever 87 with a roller 86 at its tip, and when the roller 86 is in the corner 5, the limit switch LSI opens.

The sea urchin is turning.

It goes without saying that the limit switch LSI is substantially fixed to the board 19.

The wiring state of the switchgear of this embodiment is as shown in FIG. 14, and the switch in the circuit diagram of FIG. 14 represents the state in which the vane plate 2 of the damper is closed.

Terminal J1 is connected to one end of DC motor 6B via a limit switch LSI, and the other end of motor 68 is connected to terminal J2.

A solenoid 9 is connected in parallel to the motor 6B, and a series circuit of a microswitch 42 and a solenoid 15 is connected between terminals J2 and J3.

Next, the effects of the above embodiment will be explained.

When current is supplied to the terminals Jl and J2, the solenoid 9 is energized and its plunger 74 is retracted, causing the lever 69 to rotate against the tensile force of the elastic body 8 and locking plate 79
rotates clockwise in FIG.
is separated from the meshing portion between the gear 6B and the large gear 31, the motor 68 rotates, and the drive shaft 5 rotates counterclockwise in FIG. 13.

When the drive shaft 5 rotates, the rotation of the actuating cylinder 3 of the spring clutch A is limited by the frictional force with the movable member 7 that is in pressure contact with it.
is twisted, the inner diameter of the coil spring 4 is reduced, and the coil spring 4 is wound around the cylindrical portion 5A of the drive shaft 5 and the cylindrical portion 6A of the driven shaft 6, whereby the rotation of the drive shaft 5 is transmitted to the driven shaft 6 via the coil spring 4. be done.

The rotation of the driven shaft 6 is transmitted to the large gear 31 via the gear 6B, the main shaft 20 and the rotating shaft 1 rotate, and the blade plate 2
Open clockwise in the diagram.

When the drive shaft 5 continues to rotate, since both ends of the coil spring 4 are locked to the upper part of the actuating cylinder 3 and the lower part of the driving shaft 5, the actuating cylinder 3 overcomes the restraining force of the movable member 7 and rotates.

The frictional force between the movable member 7 and the operating barrel 3 is such that when the drive shaft 5 starts rotating, the coil spring 4 is sufficiently wound around the cylindrical portion 5A of the drive shaft 5 and the cylindrical portion 6A of the driven shaft 6. It is set to just the size.

When the cam 17 rotates due to the rotation of the main shaft 20, the lever 10 rotates clockwise in FIG.
It is locked to the hook 13 of 4.

At the same time, the locking protrusion 11 on the upper left end of the lever 10 rises and comes into contact with the end of the cam 17, preventing the main shaft 20 from rotating in the closing direction, and the main shaft 20 is held in the fully open position. (state shown in Figure 5).

When the blade plate 2 is opened, in other words, when the main shaft 20 is fully opened, the cam 8 fixed to the large gear 31
The roller 86 of the limit switch LSI fits into the notch 85 of 4, the limit switch LSI opens, and the currents of the motor 68 and the solenoid 9 are cut off.

When the solenoid 9 is deenergized, its plunger T4 is pulled out by the tensile force of the bullet 8, and the lever 69 rotates forward and returns.

At this time, the movable member 7 that is in pressure contact with the operating cylinder 3
Since it rotates counterclockwise in the figure, the actuating barrel 3 also rotates in the same direction, and the coil spring 4 locked to the upper end of the actuating barrel 3
As the upper end rotates with the rotation of the operating cylinder 3, the degree of twist of the coil spring 4 is reduced, the inner diameter of the coil spring 4 is expanded, and the connection between the drive shaft 5 and the driven shaft 6 of the spring clutch A is improved. It is cut off (the state shown in Figure 11).

Further, as the main shaft 20 rotates, the actuating plate 40 fixed to the side of the main shaft 20 closes the microswitch 42 .

Next, when a fire occurs and voltage is applied to terminals J2 and J3 from a smoke detector (not shown), the solenoid 15 is energized and its plunger 50 resists the elastic force of the bullet 16. The arm 14 slides to the right in FIG.
Move away from the end of arm 14 and pull the hook 13 and lever 1.
The main shaft 20 is disengaged from the end of the coil spring 30.
This rotational force causes the cam 17 to push the locking protrusion 11 and rotate the lever 10 in the counterclockwise direction in FIG. Return to the clockwise direction (closing direction) in Figure 8.

Therefore, the rotary shaft 1 fixed to the main shaft 20 also returns and the blade plate 2 attached to this shaft 1 is closed.

When the main shaft 20 rotates in the closing direction, the actuating plate 40 separates from the microswitch 42, opening the switch 42 and deenergizing the solenoid 15.

When the main shaft 20 returns, the large gear 31 and the gear 6B naturally rotate, but the gear 6B is disconnected from the drive shaft 5 of the spring clutch A, so it rotates freely and is not engaged by the locking plate 79. When the stopper 83 is pushed by the teeth of the large gear 31, it escapes from the teeth in the backward direction, so it does not pose any obstacle to the rotation of the main shaft 20 in the closing direction.

As already explained, when the thermally responsive member is actuated, the plunger 50 moves to the fifth position even if the solenoid 15 is not energized.
Since it slides to the right in the figure, the vane plate 2 is closed in the same manner as when the solenoid 15 is energized.

Note that the microswitch 41 is used to operate a lamp, a buzzer (not shown), or the like to remotely know whether the damper is open or closed.

As described above, the motor damper vane opening/closing device of the present invention uses a spring clutch so that when the damper is closed, the rotating shaft 1 side and the motor 68 side are completely separated, so that the damper can be reliably moved. Closed.

Further, when the locking plate 79 is provided as in the embodiment, the locking piece 83 of the locking plate 79 bites between the teeth of the large gear 31 after the damper is closed, and is the first
Since it prevents rotation in the clockwise direction in the figure, it can prevent the closed damper vane 2 from opening due to changes in the pressure of the gas in the duct, etc., so it can be adopted as necessary. .

The structure of the embodiment of the invention set forth in the first claim is the same as the embodiment described above, but the locking device C is omitted, and the circuit is simplified.

As shown in FIG. 15, the circuit is constructed by connecting both ends of a series circuit of a limit switch LSI and a motor 68 and both ends of a solenoid 9 between the end portion 4 and the terminal 15.

Current is supplied to the terminals J4 and J5 via the a contact of a relay (not shown) which is deenergized when the smoke detector detects smoke.

Now, when you turn on the power to the smoke detector, terminal J4. Voltage is applied to J5, the solenoid 9 is energized, the motor 68 is rotated, the main shaft 20 is rotated via the spring clutch A, and the vane plate 2 is opened, as in the previous embodiment.

In the previous embodiment, when the vane plate 2 opened, the limit switch LSI was opened by the cam 84, and the current to both the motor 68 and the solenoid 9 was cut off, but in this embodiment, the solenoid 9 was Only the current in the motor 68 is cut off without being deenergized.

Even if the current to the motor 68 is cut off, the motor 68 does not rotate in the reverse direction, so after the motor 68 stops, the cylindrical portion 5A of the drive shaft 5 and the cylindrical portion 6 of the driven shaft 6 of the spring clutch A are
With the coil spring 4 wound around A, that is, the drive shaft 5
and the driven shaft 6 remain connected.

Therefore, as long as the drive shaft 5 does not reverse, the gear 6B will be held in a stopped state, and the large gear 31 meshed with it will remain in a stopped state.
Since the main shaft 20 and the rotary shaft 1 cannot rotate, the blade plate 2 is held in an open state.

Generally, a DC motor with a commutator is used as the damper motor, and the motor 68 in this embodiment is also the same.

In such a motor with a commutator, the brushes are in pressure contact with the commutator, so the brushes act like a brake, so the shaft of the motor 68 does not rotate even if a small rotational force is applied.

Furthermore, when the speed reducer 64 is interposed as in this embodiment, even if the drive shaft 5 receives a reverse rotation force, it can sufficiently counteract it and maintain a stopped state.

If you are concerned about the reversal of the drive shaft 5, please turn the motor 68
Needless to say, a motor with a brake may be used as a brake, a ratchet mechanism for preventing reverse rotation may be added to the drive shaft 5, or a worm and a worm gear may be provided in the reduction gear.

Now, when the smoke detector detects smoke due to a fire outbreak, the relay is deenergized and the a contact opens, and terminal J4. The power supply to J5 will be cut off.

When this happens, the solenoid 9 is deenergized, its plunger 74 is pulled out by the rotational force of the bullet 8, and the operating cylinder 3 is rotated counterclockwise in FIG. 13.

Then, as explained in the previous embodiment, the coil spring 4 is loosened, the connection between the drive shaft 5 and the driven shaft 6 of the spring clutch A is severed, and the gear 6B is in a state where it can freely rotate. 20 and rotating shaft 1 are torsion coil springs 3
The vane plate 2 is rotated counterclockwise in FIG. 1 by a restoring force of 0, and the vane plate 2 immediately closes.

The latter embodiment cuts off the current and closes the damper in the event of a fire.

This has the advantage that the damper can be closed even if there is a power outage due to fire or if the wiring is burnt out.

As described above, the motor damper blade opening/closing device according to the present invention uses a spring clutch.

Therefore, the transmission between the rotary drive side of the damper and the rotary shaft side having the vane plate can be reliably interrupted with a small force, so that the closure of the vane plate can be reliably performed in an emergency.

Furthermore, since a complicated control circuit is not required, the reliability is extremely high.

Although known fitting type clutches have the drawback of generating noise or impact when the protrusion is fitted into the recess, the two inventions of the present application do not have such drawbacks.

Furthermore, since known fitting type clutches fit a convex part into a concave hole, it is necessary to improve manufacturing accuracy to ensure the fitting. , since the elasticity of the coil spring 4 is utilized, there is no need to increase the manufacturing precision as in the case of a fitting type clutch, and the assembly work is therefore easy.

[Brief explanation of the drawing]

The drawings are schematic diagrams showing an embodiment of the blade opening/closing device for a motor damper according to the present invention, and FIGS. 1 to 14 are diagrams of an embodiment of the invention set forth in claim 2. , FIG. 15 is a circuit diagram of an embodiment of the invention set forth in claim 1. Fig. 1 is a plan view of the internal structure with the blades open, Fig. 2 is a front view of the internal structure, Fig. 3 is a plan view, and Fig. 4 is a plan view of the internal structure with the blades open.
The figure is a cross-sectional view of the damper, FIG. 5 is a front view of the locking device with the blade plate open, and FIG. 6 is a bottom view.
Fig. 7 is a front view of the locking device with the blades closed, Fig. 8 is a bottom view, Fig. 9 is a vertical sectional view of the spring clutch, and Fig. 10 is the left side with the spring clutch in the disengaged state. 11 is a plan view, FIG. 12 is a left side view when the spring clutch is in a connected state, FIG. 13 is a plan view, and FIGS. 14 and 15 are circuit diagrams. Reference numbers in the drawings: 1...rotating shaft, 2...vane plate, 3...actuating tube, 4...coil spring, 5... Drive shaft, 6... Driven shaft, 7
...Movable member, 8...Bullet body, 9...
...Solenoid, 10...Lever, 11...
...Engagement protrusion, 12...Bullet body, 13...
...Hook, 14...Arm, 15...
・Solenoid, 16... Bullet, 17...
・Cam, A...Spring clutch, B...
...Transmission device, C...Locking device.

Claims (1)

[Claims] 1. A vane plate 2 is fixed to a rotating shaft 1 that crosses the damper casing, and this rotating shaft 1 is used in a damper in which rotational force is always applied in a direction in which the vane plate 2 closes. The blade opening/closing device includes a cylindrical actuating cylinder 3, and a coil spring 4 located inside the actuating cylinder 3 and having an outer diameter smaller than the inner diameter of the actuating cylinder 3, and one end of which is locked to the actuating cylinder 3. , a drive shaft 5 whose one end is inserted into the coil spring 4, has a diameter smaller than the inner diameter of the coil spring 4, the other end of the coil spring 4 is locked, and is driven to rotate in a fixed direction; 4, the driven shaft 6 has a smaller diameter than the inner diameter of the coil spring 4, and a movable member 7 that is in pressure contact with the actuating cylinder 3 and can rotate in the circumferential direction of the actuating cylinder 3. The coil spring 4 is wound in such a direction that the inner diameter of the coil spring 4 decreases when the drive shaft 5 is rotated while the rotation of the actuating cylinder 3 is restrained, and the spring clutch A is pressed against the actuating cylinder 3. movable member 7
The bullet 8 is constantly trying to rotate in the direction in which the drive shaft 5 is rotationally driven, and the movable member 7 resists the rotational force of the bullet 8.
a solenoid 9 for moving the driven shaft 6 of the spring clutch A, and a rotational force for substantially transmitting the rotational force of the driven shaft 6 of the spring clutch A to the rotating shaft 1 having the blade plate 2 to rotate the rotating shaft 1 in the direction in which the blade plate 2 opens. A blade opening/closing device for a motor damper, comprising a transmission device B. 2 A vane plate opening/closing device used in a damper, in which a vane plate 2 is fixed to a rotating shaft 1 that crosses the damper casing, and this rotating shaft 1 is always given a rotational force in a direction in which the vane plate 2 closes. There is a cylindrical actuating tube 3, a coil spring 4 located inside the actuating tube 3 and having an outer diameter smaller than the inner diameter of the actuating tube 3, and one end of which is locked to the actuating tube 3; A drive shaft 5 is inserted into the coil spring 4 and has a smaller diameter than the inner diameter of the coil spring 4. The other end of the coil spring 4 is locked and the drive shaft 5 is rotated in a fixed direction. It consists of a driven shaft 6 having a smaller diameter than the inner diameter of the coil spring 4, and a movable member 7 that is in pressure contact with the actuating tube 3 and can rotate in the circumferential direction of the actuating tube 3, so that the winding direction of the coil spring 4 is the same as that of the actuating tube. a spring clutch A whose winding direction is such that the inner diameter of the coil spring 4 decreases when the drive shaft 5 is driven to rotate while the rotation of the coil spring 3 is restrained; and a movable member 7 that is in pressure contact with the operating cylinder 3 of the spring clutch A
The bullet 8 is constantly trying to rotate in the direction in which the drive shaft 5 is rotationally driven, and the movable member 7 resists the rotational force of the bullet 8.
a solenoid 9 for moving the driven shaft 6 of the spring clutch A, and a rotational force for substantially transmitting the rotational force of the driven shaft 6 of the spring clutch A to the rotating shaft 1 having the blade plate 2 to rotate the rotating shaft 1 in the direction in which the blade plate 2 opens. a transmission device B, a lever 10 which is located on the side of the rotating shaft 1 and whose inside is pivotally supported and is rotatable in the vertical direction; A locking protrusion 11, an elastic body 12 that constantly applies an elastic force in a direction in which the tip side of the lever 10 rises, and a hook that is located on the side of the base end of the lever 10 and can engage with the base end of the lever 10. 13 and whose lower end is pivotably supported, a solenoid 15 that rotates the hook 13 of the arm 14 in a direction away from the base end of the lever 10, and the hook 13 of the arm 14 is a lever. It consists of an elastic body 16 that constantly applies an elastic force in the direction of engagement with the base end of the lever 10, and a fan-shaped cam 17 that is located near the top of the lever 10 and is substantially fixed to the rotating shaft 1. A vane opening/closing device for a motor damper, characterized in that it is equipped with a locking device C. j