JP2001090431A - Open-close driving device for swing door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an open-close driving device for a swing door, in which the power of a motor can be economized and a door closer corresponding to the weight of the door can be used in the case of service interruption, which also has comparatively simple constitution and in which an installation space is not also increased. SOLUTION: The open-close driving device for the swing door has a shaft 3 directly coupled with the swing door 2, a motor 4 driving the shaft 3, a door closer 9 in which energizing force for closing the swing door 2 in interlocking with the revolution of the shaft 3 is stored, and a clutch means 6 linking a section between the motor 4 and the shaft 3 in the case of energization and interrupting power transmission in the case of service interruption. The open- close driving device has locking means 34, 35, 36 constraining the door closer 9 under an urged state in the case of energization and releasing the door closer 9 in the case of service interruption and a changeover means 30 interrupting the interlocking of the door closer 9 and the shaft 3 after the locking means constrain the door closer 9 under the urged state and being capable of linking the door closer 9 and the shaft 3 when the locking means are released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing door opening / closing drive device having an automatic closing function for automatically returning a swing door to a closed position when a power failure occurs.

[0002]

2. Description of the Related Art In recent buildings, electric automatic doors are often installed, but a swing door that automatically opens and closes automatically when a fire occurs, even if it cannot be electrically driven due to a power failure. It is required to have a fire and smoke prevention function. Conventional swing doors provided with fire and smoke prevention functions include, for example, a motor with a speed reducer.
The door closer is linked to the rotation axis of the swing door, which is driven to rotate by the motor, and the rotation axis of the swing door is rotated by the urging force of the door closer in the event of a power failure, and the manually opened door returns to the closed position. An automatic door opening / closing device has been proposed (Japanese Patent Laid-Open No. 58-178777).

[0003]

In recent years, a swing door that automatically opens and closes has been installed in a theme park, a theater or the like in various places in recent years. In such a swing door, the thickness of the door is large due to the enhancement of soundproofing, and the weight is considerably increased by a soundproof material or the like. In a swing door having a large door weight, a high torque is required, so that the reduction ratio of the speed reducer is high, and the swing door may not be able to return to the closed position only by the urging force of the door closer. For this reason, a door closer having a biasing force that overcomes the speed reducer is selected.
Since the motor is energized each time the door is opened and closed, the supply voltage applied to the motor is increased, and there is a problem that power loss is caused when the door is normally opened and closed.

Further, the conventional automatic opening / closing swing door requires a power for rotating the door and a power for accumulating fluid pressure and elastic energy in the door closer each time the door is normally opened and closed, so that a large power is used. There is a problem. on the other hand,
The door closer is sufficient if it is used at the time of an abnormality such as a normal power failure. If it is not used at the time of normal opening and closing of the door, the power loss is reduced and it becomes economical. However, when the swing door is normally opened and closed, only the electric motor and the rotating shaft of the swing door are driven, and the accumulation and opening of the fluid pressure in the door closer or the urging force of the spring (hereinafter simply referred to as the urging force) is repeated. If the door is stopped to shut off the interlock between the rotating shaft and the door closer, and the door is closed only with an abnormal condition, the device becomes large and complicated, and the installation space becomes large. There is a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to save the power of a motor at the time of normal door opening and closing, and to provide a door closer according to the weight of the door at the time of power failure. The object of the present invention is to provide a swing door opening / closing drive device which can be used and accumulates biasing force only once in a door closer, has a relatively simple structure and does not increase the installation space. I have.

[0006]

In order to solve the above-mentioned problems, the present invention provides a swing door opening / closing drive device according to the first aspect of the present invention, which comprises a rotating shaft (3) directly connected to a swing door. ), A motor (4) and a speed reducer (5) for driving the rotating shaft (3), and an attachment for closing the swing door (2) in conjunction with the rotation of the rotating shaft (3). A door closer (9) for storing power; furthermore, the motor (4) and the rotating shaft (3) are linked when power is supplied, and the motor (4) and the rotary shaft are rotated when a power failure occurs. A clutch means (6) for interrupting the transmission of power to and from the shaft (3).

A swing door opening / closing drive device according to a second aspect of the present invention provides a rotating shaft (3) directly connected to the swing door, a motor (4) for driving the rotating shaft (3), and A speed reducer (5); a door closer (9) for storing an urging force for closing the swing door (2) in conjunction with the rotation of the rotary shaft (3); Locking means (34, 35, 36) for restraining the (9) in an energized state and releasing it at the time of a power failure;
4, 35, 36) restrained the door closer (9) in an energized state and then interrupted the link between the door closer (9) and the rotating shaft (3), and released the locking means. Switching means (30) for enabling the door closer (9) and the rotating shaft (3) to be linked at times.

According to a third aspect of the present invention, there is provided a swing door opening / closing drive device, comprising: a rotary shaft (3) directly connected to the swing door; a motor (4) for driving the rotary shaft (3); A speed reducer (5); a door closer (9) for storing an urging force for closing the swing door (2) in conjunction with the rotation of the rotary shaft (3); Locking means (34, 35, 36) for restraining the door (9) in an energized state and releasing it in the event of a power failure; and the door closer after the locking means constrains the door closer (9) to an energized state. (9) Interlocking the rotation shaft (3) is interrupted, and when the locking means is released, the door shutter is closed.
A switching means (30) for linking the rotary shaft (9) with the rotary shaft (3); and a link between the motor (4) and the rotary shaft when energized, and the motor during a power failure. (4) A clutch means (6) for interrupting power transmission between the rotating shaft (3) and the rotating shaft (3).

According to a fourth aspect of the present invention, there is provided a swing door opening / closing drive device according to the second or third aspect, wherein the switching means (3) includes the rotating shaft. A cam mechanism provided in (3), wherein the protrusion (31b) fixed to a disk (31) rotatable by the motor; and the door closer (9).
A cam (32a) that can rotate in conjunction with the cam (32a), and allows the rotation of the rotating shaft (3) in a range until the protrusion (31b) comes into contact with the cam (32a). (32a) comes into contact with the protrusion (31b) to move the swing door (2) to the closed position.

According to a fifth aspect of the present invention, there is provided a swing door opening / closing drive device according to the second or third aspect, wherein the lock means includes the door closer. A disk (34) provided on the shaft portion (21) of (9) and having a notch (34a) formed on the outer periphery thereof; a bendable link member (35) abutting on the notch of the disk (34); A solenoid (36) that holds the link member (35) in a linear state to restrict the rotation of the disk (34), and makes the link member (35) bent so that the disk (34) can rotate. ).

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 (a)
FIG. 1B is a front view of the swing door opening / closing drive device 1 according to the present invention attached thereto, and FIG. 1B is a view taken along the line XX of FIG. The swing door opening / closing drive device 1 is usually mounted on an upper part of a wall of a building provided with an opening, and rotates the swing door 2 by rotating a rotation shaft 3 (described later). The swing door 2 has an upper hinge 2a.
It is rotatably attached to the opening of the wall of the building through the lower hinge 2b and receives the rotational force of the rotating shaft 3 to open and close the opening of the building. The swing door opening / closing drive device 1 is driven to open / close by operating an electric motor by a mat switch or an infrared sensor switch (both not shown).

FIG. 2 is a front view showing the structure of one embodiment of the swing door opening / closing drive device 1, and FIG.
Is a plane viewed from the arrow A in FIG. In these figures, 3
Is a rotating shaft, and the end 3a of the rectangular cross section of the rotating shaft 3 is fitted into the concave portion 2d of the swing door 2 so that the swing door 2
Is driven to reciprocate. In FIG. 2, the swing door 2 is rotated around an axis in the paper surface direction. The other end of the rotating shaft 3 has two sprockets 1
0 and 11 are fixed. The rotating shaft 3 is rotatably supported at both ends by bearings 14, 14 provided in a housing 12, and is prevented from moving in the axial direction by a retaining pin 13.

Next, reference numeral 4 denotes an electric motor with a reduction gear such as a DC motor (hereinafter simply referred to as an electric motor 4). A speed reducer 5 having a spur gear speed reduction mechanism for changing the speed is connected. The rotating force of the electric motor 4 is controlled by a rotating shaft 3 for rotating the swing door 2 from an output shaft 7 driven by the speed reducer 5.
Is transmitted to That is, a sprocket 8 is fixed to the output shaft 7, and the power of the electric motor 4 is supplied to a chain 15 wound between the sprocket 8 and the sprocket 10 fixed to the rotary shaft 3. Is transmitted to the rotating shaft 3. Reference numeral 17 denotes a chain tension adjusting bolt. A mounting plate 16 for fixing the speed reducer 5 is fixed between the base plate 18 and the pedestal plate 18 by passing bolts 19 and 19 through elongated holes. 19, 19 are loosened, and the mounting plate 16 is moved by the adjusting bolt 17 to adjust the tension of the chain 15.

An electromagnetic clutch 6 is connected to the output shaft 7.
Is mounted, and a rotational force is transmitted from the output shaft 7 to the rotary shaft 3 via the electromagnetic clutch 6. The electromagnetic clutch 6
Is composed of an electromagnet portion 6a fixed so as to rotate integrally with the output shaft 7, and an armature 6b attracted by the electromagnet 6a when energized, so that the armature 6b and the sprocket 8 rotate integrally. It is fixed to. Also,
The armature 6b is mounted so as to freely rotate with respect to the output shaft 7 when power is not supplied. That is, the electromagnetic clutch 6 is turned on at the same time as power is supplied to the electric motor 4, and the power of the electric motor 4 is transmitted to the rotating shaft 3 by the sprocket 8, the chain 15, and the sprocket 10. However, when the power supply to the electric motor 4 is cut off due to a power failure or the like, the electromagnetic clutch 6 is disconnected, and the rotational force of the electric motor 4 cannot be transmitted to the rotating shaft 3.

Numeral 9 denotes a door closer, which accumulates an urging force for driving the swing door 2 to the closed position by rotating the rotary shaft 3 via the clutch 6 by the electric motor 4. It is configured to be. That is, a shaft 21 is provided on the door closer 9, and a sprocket 20 is fixed to the shaft 21. A chain 22 is wound between the rotating shaft 3 and one of the sprockets 11 attached to the end of the rotating shaft 3. When the swing door 2 is set to the open position, the fluid pressure is increased by the power from the electric motor 4. It is configured to store the biasing force in the spring. The door closer 9 is fixed to a mounting plate 23. The mounting plate 23 has a plurality of long holes 23a,
... and pedestal pre-fixed with bolts 25, 25
Bolts 2 which are installed on the sprocket 24 and adjust the tension of the chain 22 between the sprocket 11 and the sprocket 20.
6 can be adjusted.

In the swing door opening / closing drive apparatus of the present invention having the above-described structure, when the swing door 2 is normally opened and closed when the swing door 2 is opened and closed, for example, the mat switch is depressed to turn on the electric motor. When the motor 4 is driven, torque is transmitted from the electric motor 4 to the rotating shaft 3 via the speed reducer 5, the electromagnetic clutch 6, and the sprockets 8, 10, and the swing door 2 is opened. At the same time, when the rotating shaft 3 rotates, the urging force is stored in the door closer 2. When the swing door 2 is set at the "closed position", the rotating shaft 3 is driven by the electric motor 4, the speed reducer 5, the electromagnetic clutch 6, the sprocket 8, and the 10 chain 15.
The swing door 2 is rotationally driven to the "closed position" with the assistance of the urging force of the door closer 9 in the reverse direction.

Next, when the electric motor 4 stops moving due to a power failure or the like during the opening operation of the swing door 2, the electromagnetic clutch 6 does not operate, and power is transmitted from the electric motor 4 to the rotating shaft 3. Is shut off, and the swing door 2 also stops at the open position or in the middle thereof. However, when the swing door 2 is stopped at the open position or in the middle thereof, the sprockets 20 and 11 and the chain 22 are moved only by the urging force stored in the door closer 9.
, The rotary shaft 3 can be driven to the closed position.

FIG. 4 is a front view showing an embodiment of a modified example of the swing door opening / closing drive device 1 according to the present invention, and FIG. This embodiment is different from the above-described embodiment in that it comprises an electric motor 4, a speed reducer 5 for changing the direction of a rotating shaft, an electromagnetic clutch 6, a rotating shaft 3, and a door closer 9. The same is true. A sprocket 31 is fixed to the rotating shaft 3 that directly drives the swing door 2 to rotate. A separate sprocket 32 is fixed so as to be able to rotate independently of the sprocket 31. Switching means 30 is provided between the sprocket 31 and the sprocket 32 to operate the door closer 9 in the event of a power failure and to rotate the swing door 2 to the closed position. The switching means 30 will be described later.

A sprocket 20 is fixed to the door closer 9 and stored in the door closer 9 by a chain 22 wound between the sprocket 32 and the sprocket 32 fixed to the rotary shaft 3. The applied biasing force is transmitted to the rotating shaft 3. In this case, a cam plate 34 provided with a notch 34a (see FIG. 7) is fixed to the fixing member on the shaft 21 of the door closer 9, and a solenoid 36 is provided in one notch 34a of the cam plate 34. The end of the link member 35 is locked or disengaged by the above operation. However, if a part of the link of the link member 35 is locked in the notch 34a of the cam plate 34, the shaft 21 cannot rotate. Become. That is, the cam plate 34, the solenoid 36, and the link member 35
Are locking means for stopping the rotation of the door closer 9.

Next, the configuration of the link member 35 will be described. As shown in FIG. 6, the link member 35 includes a link 35a having one end fixed to a fixed portion, and a link 35a.
a link 35c pivotally connected at one end to a shaft 35b, and one end at a shaft 35d at the end of the link 35c.
A link 35g pivotally attached to the shaft 36a of the solenoid 36 by inserting a pin 35f in the other end thereof, and a roller 35 pivotally attached to the shaft 35d.
h. That is, when the shaft 36a is projected and retracted by the operation of the solenoid 36, the link member 35 is bent or straightened, and the roller 35d pivotally attached to the end of the link 35c is cut out of the cam plate 34. Part 34a
It is designed to be locked or released.

FIG. 7 is a diagram showing the operation of the link member 35. 7A shows a state in which the swing door 2 is in the closed position, FIG. 7B shows a state in which the swing door 2 is performing an opening operation to the open position, and FIG. FIG. 7 shows a state in which the swing door 2 has almost moved to the open position.
(D), when the swing door 2 is in the open position, the roller 35d pivotally attached to the end of the link 35c of the link member 35 by the solenoid 36 in the energized state is engaged with the notch 34a of the cam plate 34. FIG. 5 is a view showing a state in which the door closer 9 is set to a locked state. As will be described later, the lock means including the cam plate 34, the link member 35, and the solenoid 36 having such a structure is used together with the switching means 30 to install the swing door opening / closing drive device at the time of door construction or the first time after power is turned on. When the door is opened, the door closer 9 is set so as not to operate with the biasing force stored.

When the shaft 21 of the door closer 9 is set in a non-rotatable manner by locking means including a cam plate 34, a link member 35 and a solenoid 36, the normal opening and closing of the swing door 2 is performed by an electric motor. The motor 4, the speed reducer 5, the electromagnetic clutch 6, and the rotating shaft 3. Therefore, the sprocket 31 and the sprocket 32 fixed to the rotating shaft 3 do not rotate simultaneously, and one sprocket 31 reciprocates and the other sprocket 32 does not rotate during normal door opening and closing. No. In the event of an emergency such as a power failure, the door closer 9
Sprocket 20, sprocket 32 and chain 22
Swing door 2 must be driven to the closed position. The switching means 30 performs such a switching operation.

FIG. 8 is a cross-sectional view taken along the line CC of FIG. When the electromagnetic clutch 6 does not operate and the transmission of the rotational force from the electric motor 4 to the rotating shaft 3 is interrupted as in the case of a power failure, the switching means 30 applies the biasing force accumulated in the door closer 9. The swing door 2 is operated to be in the closed position by utilizing the same, and the link between the rotating shaft 3 and the door closer 9 is shut off during normal opening and closing. As shown in FIG. 8 (or FIGS. 9 to 11), one sprocket 31 has a rotating cam 31a formed with a quarter arc-shaped projection 31b in the axial direction.
Is fixed, and the other sprocket 32 is formed with a semicircular cam 32a that rotates by contacting with the arc-shaped projection 31b according to the rotation angle. That is, the switching means 30 provided between the sprocket 31 and the sprocket 32 provided on the rotating shaft 3 is a cam mechanism. The sprocket 32 is mounted so as to freely rotate with respect to the rotating shaft 3, while the rotating cam 31a fixed to the sprocket 31 is mounted so as to rotate integrally with the rotating shaft 3 by a key 33. .

The configuration of the swing door opening / closing drive device according to the modified example of the present invention is as described above, and the operation is as follows. The swing door 2 is driven by an electric motor 4, a speed reducer 5, an electromagnetic clutch 6, a rotating shaft 3 and the like during normal opening and closing. Initially, when the switching means 30 sets the locking means (34, 35, 36), the cam plate 34 fixed to the rotating shaft 21 on the door closer 9 side is moved to a predetermined position (when the door closer 9 is actuated). Lock state). That is, as shown in FIG. 9A, the projection (partial cam) 31b on the large-diameter sprocket 31 side.
To the semicircular cam 32 of the sprocket 32 on the door closer 9 side.
As shown in FIG. 9 (B),
Rotate the swing door 2 together in the opening position direction, and
As shown in (C), the end of the link 35c of the link member 35 is set to be locked to the end 34a of the cam plate 34 when the swing door 2 is in the fully opened position.

When the switching means 30 (31b, 32a) and the locking means (34, 35, 36) are set, the swing door 2 is operated normally by the electric motor 4 with the door closer 9 locked. An opening and closing operation can be performed.
In this case, the projection 31b of the sprocket 31 fixed to the rotating shaft 3 is, as shown in FIG. 10 (A), when the door is in the closed state, immediately before contacting one end of the semicircular cam 32a. In state. While the swing door 2 is being opened, as shown in FIG.
1b moves to the other end of the semicircular cam 32a, and at the open position, as shown in FIG. 10 (C), the projection 31b of the sprocket 31 has the semicircular cam 32a. Stops just before contacting the other end of the. As described above, the cam mechanism operates as shown in FIG.
The state of (A) to FIG. 10 (C) is repeated.

FIG. 11 is a diagram showing driving of the swing door 2 from the open position to the closed position in an emergency such as a power failure. FIG. 11A shows a state in which the power failure occurs while the swing door 2 is in the middle of the “open position”. In this case, when a power failure occurs, the protruding shaft portion 36a of the solenoid 36 is retracted from the state of FIG.
4, 35, 36) come off. That is, the roller 35h pivotally attached to the end of the link 35c of the link member 35 is
From the end 34a. Then, the urging force stored in the door closer 2 is released as shown in FIG.
0 and 32 rotate. Since the semi-circular cam 32a is fixed to the sprocket 32, the semi-circular cam 32a
Is driven to rotate while pushing a projection 31b provided on a sprocket 31 fixed to the rotating shaft 3 at its end. Thus, as shown in FIG. 11C, the rotating shaft 3 is rotated by the semicircular cam 32a via the protrusion 31b, and the swing door 2 is in the closed position.

The specific embodiment of the swing door opening / closing drive device according to the present invention is as described above.
In the embodiment of the swing door opening / closing drive device provided with the lock means (34, 35, 36) and the switching means 30 shown in FIG. 5, the rotary shaft 3 is driven without providing the clutch means such as the electromagnetic clutch 6. You may do it. In the above-described embodiment, the description has been made on the assumption that the electric motor 4 does not conduct electricity such as at the time of a power failure. However, when the electric motor 4 cannot drive the swing door due to failure of the electric motor 4 itself or the like. Needless to say, it can also be operated to the closed position.

[0028]

As described above in detail, according to the first aspect of the present invention, at the time of a power failure, the electromagnetic clutch disconnects the link between the electric motor and the rotating shaft and is not affected by the speed reducer. Since the rotating shaft of the door can be rotated by the urging force accumulated in the door closer, the door closer may be selected according to the weight of the door, and the power loss of the motor in the normal opening and closing is required. Can also be reduced.

According to the second aspect of the present invention, after the locking means restrains the door closer to the biased state when the door is installed or the first swing door is set to the open position after the power is turned on, Since the switching means breaks the link between the door closer and the rotating shaft and rotates only by the motor, even if a door closer having a biasing force overcoming the speed reducer is selected, the first one time of the swing door is used. The load is only applied to the motor at the time of the opening operation of the motor, but does not become the load thereafter, and the power loss of the motor is reduced. Further, at the time of a power failure, the locking means is released, so that the door can be moved to the closed position only by the biasing force accumulated in the door closer.

According to the third aspect of the present invention, the motor does not become a load on the motor after the door closer is restrained in an energized state by the lock means. Since the power transmission between the door closer and the door closer is not required, the door closer may generate an urging force in accordance with the weight of the door, and a small one can be selected.

According to the fourth aspect of the present invention, since the switching means is achieved by the mechanical cam mechanism provided on the rotating shaft, the overall apparatus does not become complicated and large. Therefore, it is easy to install the swing door opening / closing drive device behind the ceiling at a low cost with limited eyes.

According to the fifth aspect of the present invention, the locking means includes a foldable link member for restricting rotation of the disk fixed to the shaft of the door closer, and a foldable link member. This is achieved by the regulating solenoid, so that the door closer can be automatically set to the energized state when the swing door is moved to the open position without requiring a separate position detector such as a lead switch. The lock state can be released simultaneously with the power failure.

[Brief description of the drawings]

FIG. 1A is a front view of a state in which a swing door opening / closing drive device according to the present invention is mounted, and FIG. 1B is a view taken along line XX of FIG. 1A.

FIG. 2 is a front view showing the configuration of one embodiment of the swing door opening / closing drive device of the present invention.

FIG. 3 is a plane viewed from an arrow A in FIG. 2;

FIG. 4 is a front view showing a configuration of an embodiment of a modification of the swing door opening / closing drive device of the present invention.

FIG. 5 is a plane viewed from the arrow B in FIG. 5;

FIG. 6 is a diagram showing a configuration of a lock means constituting the swing door opening / closing drive device of the present invention.

FIG. 7 is an explanatory view of the operation of the lock means constituting the swing door opening / closing drive device of the present invention, and FIG.
FIG. 7B shows a state in which the swing door is in the closed position.
7 shows a state where the swing door is rotating to the open position, FIG. 7 (C) shows a state where the swing door is rotating to almost the open position, and FIG. 7 (D) shows a state where the swing door is open. It is a figure which shows a state which is in a position state and the door closer is set to the locked state.

FIG. 8 is a cross-sectional view taken along the line CC of FIG. 4, showing a configuration of a switching unit.

FIGS. 9A to 9C are diagrams showing the operation of the switching means when setting the locking means.

FIGS. 10 (A) to 10 (C) are diagrams showing the operation of the switching means when a normal swing door is opened and closed.

FIGS. 11A to 11C are diagrams showing the operation of the switching means when the swing door is opened and closed during a power failure.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 swing door opening / closing drive device 2 swing door 3 rotating shaft (swing door rotating shaft) 4 electric motor with reduction gear 5 reduction gear 6 electromagnetic clutch 7 output shaft 8 sprocket 9 door closer 10 sprocket 11 sprocket 15 chain Reference Signs List 20 sprocket 21 door closer shaft 22 chain 30 switching means 31 sprocket 31a rotating cam 31b projection 32 sprocket 32a semicircular cam 34 cam plate 35 link member 36 solenoid

Claims (5)

[Claims] 1. A rotating shaft directly connected to a swing door, a motor and a speed reducer for driving the rotating shaft, and an urging force for closing the swing door in association with rotation of the rotating shaft. A door closer, and further connects the motor and the rotating shaft during energization and the motor during power failure.
A swing door opening / closing drive device comprising a clutch means for interrupting power transmission between the rotor and the rotary shaft. 2. A rotating shaft directly connected to a swing door, a motor and a speed reducer for driving the rotating shaft, and an urging force for closing the swing door in association with rotation of the rotating shaft. A locker for restraining the door closer in an energized state when energized and releasing it in the event of a power failure; and the door closer after the lock means constrains the door closer in an energized state. Switching means for interrupting the link between the door closer and the rotary shaft, and enabling the door closer and the rotary shaft to be linked when the lock means is released;
A swing door opening / closing drive device comprising: 3. A rotating shaft directly connected to the swing door, a motor and a speed reducer for driving the rotating shaft, and an urging force for closing the swing door in conjunction with the rotation of the rotating shaft. A locker for restraining the door closer in an energized state when energized and releasing it in the event of a power failure; and the door closer after the lock means constrains the door closer in an energized state. Switching means for interrupting the link between the door closer and the rotary shaft, and enabling the door closer and the rotary shaft to be linked when the lock means is released;
A drive unit for opening and closing a swing door, comprising: clutch means for linking the motor and the rotating shaft when energized, and for interrupting power transmission between the motor and the rotating shaft during a power failure. . 4. The switching means is a cam mechanism provided on the rotating shaft, wherein the switching means is rotatable in conjunction with a projection fixed to a disk rotatable by the motor and the door closer. A configuration that allows the rotation of the rotating shaft until the protrusion comes into contact with the cam, and moves the swing door to the closed position by contacting the cam with the protrusion. The swing door opening / closing drive device according to claim 2 or 3, wherein: 5. A disk provided on a shaft of the door closer and having a notch formed on an outer periphery thereof, a link member which is in contact with the notch of the disk, and a bendable link member; 4. The swing door according to claim 2, further comprising: a solenoid that holds a member in a linear state to restrict rotation of the disk, and that allows the link member to be bent to rotate the disk. Opening and closing drive.