JPH0522632Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a device for automatically opening and closing a building opening/closing body (including a shielding body) such as a shutter, a blind, or a louver.

[Conventional technology]

As is well known, devices for automatically opening and closing building opening/closing bodies (shielding bodies) such as shutters, blinds, and louvers use the power of a motor to roll up and lower the opening/closing body, and are capable of fully opening,
The opening/closing body can be stopped at a desired position, such as fully closed or an intermediate position. As a means for maintaining the stop position of such an opening/closing body, it is widely adopted to incorporate a brake shoe, an electromagnetic clutch, etc. into an automatic opening/closing device, as shown in FIGS. 9 and 10. In the case of the means shown in FIG. 9, a brake plate b is fixed to a motor shaft a, and a ring-shaped brake system is fitted into a mounting hole d of a motor case c and receives the elastic force of a spring e. Since the brake member f is in pressure contact with the brake plate b, a braking force is always applied to the motor shaft a. That is, in the means shown in FIG. 9, when the motor is on, the motor shaft a rotates against the braking force,
When the motor is turned off, the motor shaft a is stopped by the braking force. Therefore, the operation shaft (not shown) of the opening/closing body (shutter, blind) connected to and interlocking with the motor shaft a stops at the same time as the forward or reverse rotation of the motor shaft a stops. The opening/closing body is thus held in a predetermined rolled-up or rolled-down position. In the case of the means shown in FIG. 10, an electromagnetic coil g fixed to a motor case c, a flange h attached to an end of a motor shaft a, and rotated integrally with the flange h held by the flange h, and A suction target plate j that can be contacted with the flange h, and a suction target plate j
and a spring i for separating the coil from the electromagnetic coil g side. In the means shown in FIG. 10, when the electromagnetic coil g is not energized, the attracted plate j is separated from the electromagnetic coil g by the elastic force of the spring i;
When the electromagnetic coil g is energized, the attracted plate j is attracted to the electromagnetic coil g side against the spring i. That is, in the means shown in FIG. 10, when the motor is on and the electromagnetic coil is off, the motor shaft a rotates without receiving braking force, and when the motor is off and the electromagnetic coil is on, the attracted plate j is attracted by the electromagnetic coil g. , motor shaft a is braked. Therefore, the operation shaft of the opening/closing body that is interlocked with the motor shaft a stops at the same time as the forward or reverse rotation of the motor shaft a stops, and thus the opening and closing body moves to the predetermined hoisting position or lowering position. is maintained.

[Problem that the idea aims to solve]

In the case of the means shown in Fig. 9, since the brake plate b and the brake shoe f are always in frictional contact via the spring e, problems arise such as an increase in the load on the motor and a reduction in the rotational torque, and compared to other parts. It is also necessary to inspect and replace brake plates b and brake shoes f, which have a high degree of wear. In addition, when the motor is not powered due to power outage, failure, etc., it becomes difficult to manually wind up and lower the opening/closing body unless the mechanical braking by brake plate b and brake shoe f is released, which may result in a fire. become unable to cope with unexpected and emergency situations such as In the case of the means shown in Fig. 10, even if we exclude the drawback that the equipment is expensive, there is something that restricts the movement of the opening/closing body when the power is intentionally cut off, that is, when the electromagnetic coil g is turned off. The opening/closing body can be opened and closed freely. When considering this from a crime prevention perspective, for example, if the opening/closing body is a shutter for the entrance/exit of a building, opening the shutter based on cutting off the power will cause
This will allow outsiders to enter. In view of these technical issues, the present invention aims to prevent wear of parts, add a function to stop the opening/closing body when the power is off, and provide a building opening/closing body that can be opened and closed easily by hand. The aim is to provide an automatic opening/closing device.

[Means to solve the problem]

The automatic opening/closing device for building opening/closing bodies according to the present invention is
In order to achieve the intended objective, the following technical measures are featured, as illustrated in the attached FIGS. 1 to 8. That is, the device of the present invention includes a motor 2 having a motor shaft 3, an output transmission shaft 8 passing through the motor 3, an operating shaft 19 parallel to the output transmission shaft 8, a fixing member 23 attached to these, and a guide member 21. , transmission member 16, gear transmission system 7, 2
7a, 27b, 28a, 28b and the coil spring 22 are housed inside the casing 1, the motor shaft 3 is provided with an output gear 6 on the outer periphery of one end thereof, and The operating shaft 19 is provided with a small gear 20 on the outer periphery of one end thereof, and the fixing member 23 includes a cylindrical body 23a and an arc-shaped locking cylinder piece 23b, and is located at the axial center. The cylindrical body 23a and the locking cylindrical piece 23b located on the outer periphery of the cylindrical body 23a are integrally formed with a gap maintained between their inner and outer peripheral surfaces, and the guide member 21 has a cylindrical shape. The transmission member 16 includes a base plate 16a having a shaft hole, an arcuate locking cylinder piece 16b, a spur gear 15, and a driven gear 27, and the locking cylinder piece 16b is attached to the base plate 16a. The spur gear 15 is provided on the outer periphery of the substrate 16a, and the driven gear 27 is attached to the substrate 16a, and the coil spring 22 is protruded from one side in a direction perpendicular to the surface. , a pair of pressing pieces 2 extending from both ends in mutually opposite centrifugal directions.
2a and 22b, and in the relative relationship between the fixed member 23, the guide member 21, and the coil spring 22, the inner diameter of the guide member 21 is equal to the cylindrical body 23a of the fixed member 23.
The coiled portion of the coil spring 22 has an inner diameter that exceeds the outer diameter and allows the coiled portion of the coil spring 22 to come into close contact with the outer periphery of the guide member 21, and the inner diameter of each of the locking cylinder pieces 23b and 16b in the fixed member 23 and the transmission member 16 is The motor 3, the output transmission shaft 8, and the operating shaft 19 are each rotatably supported within the casing 1, and the output transmission shaft 8 is an end portion of which protrudes outside the casing 1; and the fixing member 23 is fitted and fixed to the outer periphery of the output transmission shaft 8 while maintaining an interaxial distance from the output gear 6; and, the guide member 21 is fitted into the outer periphery of the cylindrical body 23a of the fixing member 23 and fixed to a part of the inside of the casing 1, and the coil spring 22 is attached to the cylindrical body 23a of the fixing member 23. It is fitted into the outer periphery and is interposed between the outer periphery of the guide member 21 and the inner periphery of the locking cylinder piece 23b of the fixed member 23, and between the output gear 6 and the fixed member 23. The transmission member 16 fitted onto the outer periphery of the output transmission shaft 8 is close to the fixed member 23,
The locking cylindrical piece 16b of the transmission member 16 covers the outer periphery of the coil spring 22, and when the transmission member 16 rotates, the winding diameter of the coil spring 22 is expanded and the fixed member 23 is When the coil spring 2 rotates,
The fixing member 23 covers the outer periphery of the coil spring 22 in order to contract the winding diameter of the coil spring 22.
The locking cylindrical piece 23b and the locking cylindrical piece 16b of the transmission member 16 face each other so as to form a substantially cylindrical shape, and these locking cylindrical pieces 23
The pressing pieces 22a and 22b of the coil spring 22 are interposed between the opposing parts of the coil springs 22a and 16b, and the output gear 6 on the output transmission shaft 8 side and the driven gear 27 on the transmission member 16 side The gear transmission system 7, 27a, 27b, 28a, 28b is interposed therebetween, and the small gear 20 on the operating shaft 19 side
and the spur gear 15 on the side of the transmission member 16 mesh with each other, or correspond to each other so as to be able to mesh with each other;
And, at the end of the output transmission shaft 8, a building opening/closing body 2 is provided.
4 is connected to a winding shaft 14 for winding up and down.

[Effect]

When the motor 2 is rotated forward or backward in the device of the present invention, these rotations are caused by the motor shaft 3 →
Output gear 6 → gear transmission system 7, 27a, 27b, 2
8a, 28b→driven gear 27→transmission member 16, and is transmitted to the transmission member 16. The transmission member 16 holds the pressing pieces 22a and 22b of the coil spring 22 between the locking cylindrical piece 16b and the locking cylindrical piece 23b of the fixed member 23, so that the correct position of the transmission member 16 is The reverse rotation is transmitted to the fixed member 23 via the pressing pieces 22a, 22b of the coil spring 22, and the output power transmission shaft 8 that holds the fixed member 23 fixedly rotates in the forward and reverse directions as well. When the output transmission shaft 8 rotates forward and backward in this manner, the opening/closing body 24 can be wound up or down via the winding shaft 14 connected to the end of the output transmission shaft 8. In the above, when the transmission member 16 receives power from the motor 2 and rotates forward and backward, the winding diameter of the coil spring 22 increases, and the coiled portion of the coil spring 22 separates from the outer periphery of the guide member 21. That is, when the opening/closing body 24 is rolled up or rolled down, the coil spring 22 does not generate braking friction against the guide member 21. As is obvious, when the motor 2 stops intentionally or due to an unexpected situation while the opening/closing body 24 is being hoisted up or down, the coil spring 22
The force that tries to increase the winding diameter disappears. In such a case, the coil spring 22 is restored and its coiled portion is tightly wound and tightly adheres to the outer periphery of the guide member 21, so that the transmission member 16, fixed member 23 (output transmission shaft 8), etc. cannot rotate. Can not. That is, since the coil spring 22 generates braking friction against the guide member 21, the opening/closing body 24 will not fall involuntarily. When the power to the motor 2 is cut off due to a failure, power outage, etc., the opening/closing body can be rolled up or down by rotating the operating shaft 19 in forward and reverse directions. That is, operation shaft 19 → small gear 20 → spur gear 1
5→transmission member 16→coil spring 22→fixing member 23→output transmission shaft 8→winding shaft 14, forward and reverse rotation of the operating shaft 19 is transmitted to the winding shaft 14, so the opening/closing body 24 is rolled up in the same manner as above. It can be rolled up or rolled down. On the other hand, when the output transmission shaft 8 is to be rotated in the forward and reverse directions via the winding shaft 14, the coil spring 22 is wound tightly around the outer circumference of the guide member 21, and the coil spring 22 is tightened around the guide member 21.
Since the above-mentioned braking friction is generated against the opening/closing body 24, the opening/closing body 24 cannot be opened or closed.

【Example】

An automatic opening/closing device for an opening/closing body according to the present invention will be explained based on an illustrated embodiment. In FIGS. 1 to 4, the casing 1 is a combination of two gear cases 9a, 9b and two motor cases 10a, 10b, and these cases 9a, 9b, 10a, 10b are arranged in the length direction. and are interconnected. As is clear in particular with reference to FIG. 2, inside the casing 1 described above, there is a motor 2 having a hollow motor shaft 3, an output transmission shaft 8 passing through the motor shaft 3, and a motor parallel to the output transmission shaft 8. operation shaft 19, fixed member 23, guide member 21, transmission member 16, gear transmission system 7, 27a, 27b, 2 attached thereto.
8a, 28b and a coil spring 22 are installed inside. As shown in FIGS. 1 to 3, the motor shaft 3 is
An output gear 6 is provided on the outer periphery of one end of the operating shaft 19, and a small gear 20 is provided on the outer periphery of one end of the operating shaft 19. As shown in FIGS. 1 to 6, the transmission member 16 includes a base plate 16a having a shaft hole and an arc-shaped locking cylinder piece 16b.
, a spur gear 15 , and a driven gear 27 . In this case, the locking cylinder piece 16b protrudes from one surface of the substrate 16a in a direction perpendicular to this, the spur gear 15 is provided on the outer periphery of the substrate 16a, and the driven gear 27 is provided on the inner surface of the substrate 16a. It is attached to a fixed gear holding plate 25 via a shaft pin 26. The guide member 21, as shown in FIGS. 1 to 6,
It has a cylindrical shape with steps in the axial direction,
The coil spring 22 has a pair of pressing pieces 22a extending from both ends in mutually opposite centrifugal directions.
22b. The coil spring 22 is formed by winding a metal wire having a rectangular cross section into a coil. As shown in FIGS. 1 to 6, the fixing member 23 includes a cylindrical body 23a and an arcuate locking cylinder piece 23b,
Further, the cylindrical body 23a located at the axial center and the locking cylinder piece 23b located at the outer periphery of the cylindrical body 23a are integrally formed with a gap maintained between their inner and outer circumferential surfaces. In the relative relationship between the fixed member 23, the guide member 21, and the coil spring 22 described above, the inner diameter of the guide member 21 is larger than the outer diameter of the cylindrical body 23a of the fixed member 23, and the coiled portion of the coil spring 22 is It has an inner diameter that can be fitted into the outer periphery of the member 21, and the fixing member 23,
Each locking cylinder piece 23b, 16b in the transmission member 16
The inner diameter of the coil spring 22 exceeds the outer diameter of the coil spring 22. In FIG. 2, a motor 2 disposed within a motor case 10a has a motor shaft 3 rotatably supported via bearings 4 and 5 located at both ends within the motor case 10a. In FIG. 2, an output transmission shaft 8 passing through the motor shaft 3 is rotatably supported via a bearing 11 at an end inside a gear case 9a and a bearing 12 at an end inside a motor case 10b. , and both ends thereof protrude outside the casing 1. In FIG. 2, the gear case 9a has a shaft hole 18 with a threaded portion 18a on the open end side of the output transmission shaft 8.
The operation shaft 19 is supported in the shaft hole 18 so as to be rotatable with the small gear 20 inward and movable in the axial direction. Further, the operating shaft 19 is subjected to a resilient force in the direction of the arrow in FIG. 2 by a spring 36 mounted across a ring-shaped washer attached to the outer periphery of the operating shaft 19 and the end of the shaft hole 18. As is clear with reference to FIG.
3 is fitted and fixed to the outer periphery of the output transmission shaft 8 while maintaining the distance between the shafts from the output gear 6 in the gear case 9a. The guide member 21 is fitted into the outer periphery of the cylindrical body 23a of the fixed member 23, and is attached to the gear case 9.
It is fixed within a. The coil spring 22 is fitted into the outer periphery of the guide member 21 and is interposed between the outer periphery of the guide member 21 and the inner periphery of the locking cylinder piece 23b of the fixed member 23. The transmission member 16 is fitted onto the outer periphery of the output transmission shaft 8 and is close to the fixed member 23, and the locking cylinder piece 16b of the transmission member 16 covers the outer periphery of the coil spring 22. In the above, the locking cylinder piece 16b of the transmission member 16
and the locking cylindrical piece 23b of the fixing member 23 that covers the outer periphery of the coil spring 22 face each other so as to form a substantially cylindrical shape, and both opposing portions of these locking cylindrical pieces 23b, 16b Each pressing piece 22a, 22b of the coil spring 22 is interposed between them. A gear transmission system extending between the output gear 6 on the motor shaft 3 side and the driven gear 27 on the transmission member 16 side includes an internally toothed sun gear 7 formed on the inner peripheral surface of the gear case 9b.
, a plurality of gear holding plates 25a, 25b, externally toothed sun gears 28a, 28b attached to the axis of each gear holding plate 25a, 25b, a shaft pin 26a,
It consists of a plurality of planetary gears 27a, 27b attached to each gear holding plate 25a, 25b via 26b. The gear holding plates 25a and 25b described above are fitted onto the outer periphery of the output transmission shaft 8 within the gear case 9b, and are located on the left and right between the output gear 6 and the gear holding plate 25. The gear holding plate 25a on the left side is fixed to the outer periphery of the output transmission shaft 8 via the sun gear 26a at its axis, and the gear holding plate 25b on the right side is also fixed to the outer periphery of the output transmission shaft 8 via the sun gear 26b at its axis. It is fixed to the outer periphery of the shaft 8. In this case, the output gear 6, the sun gear 7, the planetary gears 27, 27a, 27b, the sun gears 28a, 28b
These gears constitute a planetary gear transmission mechanism 17 for deceleration, and these gears mesh as shown below. That is, the planetary gear 27b meshes with the output gear 6 and the sun gear 7, and the planetary gear 27a meshes with the output gear 6 and the sun gear 7.
The planetary gear 27 is in mesh with the sun gears 7 and 28b, and the planet gear 27 is in mesh with the sun gears 7 and 28a. As is clear with reference to FIGS. 1 to 8, a winding shaft 14 for winding up and winding down a building opening/closing body 24 is connected to both ends of the output transmission shaft 8 via a coupling ring 13. There is. This winding shaft 14 is included in a rotating body 39 for winding up the opening/closing body 24 schematically shown in FIGS. 7 and 8. As is well known, the opening/closing body 24 is made of a shielding body such as a shutter, a blind, or a louver. In addition, the aforementioned operating shaft 19 has a small gear 20 at its inner end that can freely mesh with a spur gear 15 on the transmission member 16 side, but these spur gears 15,
The small gears 20 may always mesh. A square shaft portion 19a is formed at the outer end of the operation shaft 19, and a socket 31 attached to the tip of a flexible manual operation shaft 30 is attached to the square shaft portion 19a.
It can be attached and detached at will. In the case of FIGS. 7 and 8 shown as examples,
A manual operation shaft 30 inserted into a flexible pipe 32 (see Fig. 1) is laid to a manual opening/closing operation part 33 set at an appropriate height near a building opening such as a doorway or window. An operating handle 34 is connected to the operating end of the manual operating shaft 30 via a gear transmission mechanism such as a bevel gear. Furthermore, as is clear with reference to FIGS. 1 and 2, a set screw 35 is attached to the distal end side of the manual operation shaft 30, so that the socket 31 of the manual operation shaft 30 can be connected to the square shaft of the operation shaft 19. When these are connected by covering the gear case 9a, the setscrew 35 is inserted into the gear case 9a.
The connected state can be maintained by tightening into the threaded portion 18a of the connector. In FIGS. 7 and 8, 37 is a mounting frame provided in an opening for a building, 38 is a storage case for storing the opening/closing body 24 and the main parts of the device, and 39 is a rotating part for winding up the opening/closing body 24. 40 is a control unit, and 41 is a power source. In the embodiment described above, the power supply 41 is turned on to supply power to the motor 2, and the motor shaft 3 is rotated forward or backward, or such rotation is caused by the rotation of the planetary gear transmission mechanism 1.
It is transmitted to the rotating body 39 as follows: 7→transmission member 16→coil spring 22→fixing member 23→output transmission shaft 8→coupling 13→winding shaft 14→rotating body 39. Thus, the opening/closing body 24 is wound up or down while being wound up or unwound by the rotating body 39. FIG. 6 shows the coil spring 22 when the transmission member 16 receives power from the motor 2 and rotates in forward and reverse directions.
It shows. In FIG. 6, the transmission member 16 is indicated by the arrow a in the figure.
When the coil spring 22 is rotated in the direction of the arrow a', the winding diameter of the coil spring 22 increases, and a gap 〓c is created between the coiled portion of the coil spring 22 and the guide member 21. That is, since the coiled portion of the coil spring 22 is separated from the outer periphery of the guide member 21,
When the opening/closing body 24 is rolled up or rolled down, the coil spring 22 does not generate braking friction against the guide member 21. FIG. 5 shows the coil spring 22 when the motor 2 is stopped intentionally or due to an unexpected situation while the opening/closing body 24 is being wound up or down. In this case, the force that tries to increase the winding diameter of the coil spring 22 disappears, so that the coil spring 22 returns to its original state. Accordingly, the coiled portion of the coil spring 22 is tightened, and the guide member 21
The transmission member 16, the fixed member 23 (output transmission shaft 8), etc. cannot rotate. Therefore, when the motor 2 stops intentionally or due to an unexpected situation, the coil spring 22 generates braking friction against the guide member 21.
The opening/closing body 24 will not fall involuntarily. Furthermore, when the opening/closing body 24 is held in a stopped state in this manner, no outsider is allowed to enter when the power is turned off. In addition, when the power to the motor 2 is cut off due to a failure, power outage, etc., manual operation using the operating shaft 19 is sufficient. That is, when the operating shaft 19 is rotated in the forward and reverse directions, the rotation is caused by the rotation of the operating shaft 19 → small gear 20 → spur gear 1.
5→transmission member 16→coil spring 22→fixing member 23→output transmission shaft 8→winding shaft 14 winding shaft 14→rotating body 39. Since the signal is transmitted to the rotating body 39, the opening/closing body 24 is wound up in the same way as above. It can be rolled up or rolled down. On the other hand, when the output transmission shaft 8 is to be rotated in the forward and reverse directions via the winding shaft 14, the coil spring 22 is tightly wound around the outer periphery of the guide member 21 as shown in FIG. Since the above-mentioned braking friction is generated against the opening/closing body 24, the opening/closing body 24 cannot be opened or closed. Therefore, if a person outside the home tries to forcibly wind up the opening/closing body 24 and a force to rotate the winding shaft 14 is applied from the outside, the winding force of the coil spring 22 prevents this.

[Effect of the idea]

The automatic opening/closing device for building opening/closing bodies according to the present invention is
It has the following effects. Because the configuration is based on a gear transmission system,
No excessive load is applied to the motor, no reduction in rotational torque, and no premature wear of parts. Therefore, not only is maintenance and inspection of the device easier, but the opening/closing body can be operated stably and easily over a long period of time. When the motor is not powered due to power outage, failure, or other reasons, the opening/closing body can be manually operated via the operating shaft. Therefore, preparations for unexpected and emergency situations can be technically established, and secondary disasters caused by the inability to open and close the opening/closing body can be avoided. Self-stop function works when the motor is powered off. That is, when an intruder outside tries to forcibly wind up the opening/closing body, and a force to rotate the winding shaft is applied from the outside, the coil spring prevents this. Therefore, security measures are technically established and no intrusion from the outside is allowed. Even when the motor is stopped, the self-stop function by the coil spring always works, so that, for example, when the opening/closing body is in an intermediate position between fully open and fully closed, it will not fall due to its own weight. Therefore, preparations for accidents in which the opening/closing body falls are technically established, and the device can be used safely.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main parts of an embodiment of the device of the present invention, Fig. 2 is a longitudinal sectional side view of the same embodiment, Fig. 3 is a cutaway bottom view of the main parts of the embodiment, and Fig. 4 is FIG. 1 is a sectional view taken along the line, FIGS.
The figures are a front view and a side view schematically showing an example of the use of the device of the present invention, and FIGS. 9 and 10 are sectional views showing the main parts of the conventional device. 1... Casing, 2... Motor, 3... Motor shaft, 6... Output gear, 7... Sun gear, 8...
Output transmission shaft, 9a... Gear case, 9b... Gear case, 10a... Motor case, 10b... Motor case, 14... Winding shaft, 15... Spur gear, 1
6... Transmission member, 16a... Board, 16b... Locking tube piece, 17... Planetary gear transmission mechanism, 19... Operating shaft, 20... Small gear, 21... Guide member, 2
2...Coil spring, 22a...Coil spring pressing piece, 22b...Coil spring pressing piece, 23...Fixing member, 23a...Cylindrical body,
23b... Locking cylinder piece, 24... Opening/closing body, 27...
Driven gear, 27a... Planet gear, 27b... Planet gear, 28a... Sun gear, 28b... Sun gear.

Claims (1)

[Claims for Utility Model Registration] A motor 2 having a motor shaft 3, an output transmission shaft 8 passing through the motor shaft 3, an operating shaft 19 parallel to the output transmission shaft 8, and a fixing member 23 attached thereto;
The guide member 21, the transmission member 16, the gear transmission system, and the coil spring 22 are housed inside the casing 1, and the motor shaft 3 is provided with an output gear 6 on the outer periphery of one end thereof. , and the operating shaft 19 is provided with a small gear 20 on the outer periphery of one end thereof, and the fixing member 23 includes a cylindrical body 23a and an arc-shaped locking cylinder piece 23b, and the shaft The cylindrical body 23a located at the center and the locking cylindrical piece 23b located on the outer periphery of the cylindrical body 23a are integrally formed with a gap maintained between their inner and outer peripheral surfaces, and the guide member 21 is The transmission member 16 has a cylindrical shape, and the transmission member 16 includes a base plate 16a having a shaft hole, an arc-shaped locking cylinder piece 16b, a spur gear 15, and a driven gear 27, and the locking cylinder piece 16b protrudes from one side of the substrate 16a in a direction perpendicular thereto, the spur gear 15 is provided on the outer periphery of the substrate 16a, and the driven gear 27 is attached to the substrate 16a, and A coil spring 22 has a pair of pressing pieces 2 extending from both ends of the coil spring 22 in opposite centrifugal directions.
2a and 22b, and in the relative relationship between the fixed member 23, the guide member 21, and the coil spring 22, the inner diameter of the guide member 21 is equal to the cylindrical body 23a of the fixed member 23.
The coiled portion of the coil spring 22 has an inner diameter that exceeds the outer diameter and allows the coiled portion of the coil spring 22 to come into close contact with the outer periphery of the guide member 21, and the inner diameter of each of the locking cylinder pieces 23b and 16b of the fixed member 23 and the transmission member 16 is larger than the coiled diameter. exceeding the outer diameter of the coil winding of the spring 22, and the motor shaft 3 within the casing 1;
The output transmission shaft 8 and the operation shaft 19 are each rotatably supported, and an end of the output transmission shaft 8 protrudes outside the casing 1, and the fixing member 23 is connected to the output gear 6. The guide member 21 is fitted and fixed to the outer circumference of the output transmission shaft 8 while maintaining an interaxial distance of , and the guide member 21 is fitted to the outer circumference of the cylindrical body 23a of the fixed member 23 and and the coil spring 22 is fitted into the outer periphery of the guide member 21 so that the outer periphery of the guide member 21 and the inner periphery of the locking cylinder piece 23b of the fixed member 23 are connected to each other. and that the transmission member 16, which is located between the output gear 6 and the fixed member 23 and fitted onto the outer periphery of the output transmission shaft 8, is close to the fixed member 23 side. and
The locking cylindrical piece 16b of the transmission member 16 covers the outer periphery of the coil spring 22, and when the transmission member 16 rotates, the winding diameter of the coil spring 22 is expanded and the fixed member 23 is When the coil spring 2 rotates,
The fixing member 23 covers the outer periphery of the coil spring 22 in order to contract the winding diameter of the coil spring 22.
The locking cylindrical piece 23b and the locking cylindrical piece 16b of the transmission member 16 face each other so as to form a substantially cylindrical shape, and these locking cylindrical pieces 23
The pressing pieces 22a and 22b of the coil spring 22 are interposed between the opposing parts of the coil springs 22a and 16b, and the output gear 6 on the output transmission shaft 8 side and the driven gear 27 on the transmission member 16 side The gear transmission system is interposed therebetween, and the small gear 20 on the operation shaft 19 side and the spur gear 15 on the transmission member 16 side mesh with each other or correspond to each other so as to be able to mesh with each other, and A building opening/closing body 2 is attached to the end of the output transmission shaft 8.
An automatic opening/closing device for an opening/closing body for a building, characterized in that a winding shaft 14 for winding up and lowering a winding shaft 4 is connected to the winding shaft 14.