JPH0545752Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an emergency stop device for automatic doors such as automatic opening/closing doors, shutters, and overhead doors that are installed in openings.

[Problems to be solved by the prior art and the invention] Generally, in this type of automatic door, power from a drive motor is transmitted through a transmission means using an endless body such as a chain or a belt to automatically open and close the opening. However, even in such automatic doors, it is necessary to make an emergency stop when the door body hits an obstacle such as a baggage or a person while descending. Therefore, in Utility Model Application No. 61-170696, the applicant proposed a drive shaft interlockingly connected to an electric motor;
Between the winding shaft, which is interlocked and connected to the door body, and the swingable tension sprocket, which is biased by a bullet, the door body, which is descending, comes into contact with an obstacle and the winding shaft is interrupted. The endless body is suspended so that the tension sprocket is swung to the tension side that resists the projectile as the door stops rotating, and the tension sprocket is provided with a In order to improve safety, we proposed a detection switch that detects the swinging displacement of the tension sprocket caused by contact with the electric motor and stops the electric motor in an emergency. However, in this case, if the endless body has been stretched due to long-term use, or if the take-up shaft is moved to adjust one side down, the clearance between the tension sprocket and the detection switch may change. However, there is a risk that detection sensitivity may become dull or false detections or non-detections may occur, so further improvements are needed.

[Means for solving the problem] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing an emergency stop device for an automatic door that can eliminate these drawbacks. An endless body is suspended between a drive shaft interlockingly connected to the side, a winding shaft interlockingly connected to the door body, and a tension member that swings under the biasing force of the bullet, and is used to drive the electric motor. In an automatic door configured to automatically open and close the door body via an endless body tensioned by applying tension force by the swinging tension member, the tension member is configured to automatically open and close the door body when the door body is lowered and comes into contact with an obstacle. With respect to the endless body on the side where the tension changes as the take-up shaft stops rotating, the tension member is provided so that the swinging of the tension member following the tension change resists the biasing force of the bullet. , the swinging support shaft of the tensioning member does not interfere with the tensioning member that swings within the range of applying the tensioning force, but is attached with an elastic force beyond the range of applying the tensioning force due to the extension of the endless body. Interfering with the tensioning member that swings in the direction that follows the force, the base plate that swings integrally with the tensioning member is pivotally supported, while the base plate swings within the range of applying the tensioning force. Although it does not interfere with the tension member, it interferes with the tension member, which swings in a direction that resists the projectile biasing force beyond the range of applying the tension force due to the door body contacting an obstacle, causing the electric motor to It is characterized in that a detection switch that is switched to perform an emergency stop is fixed.

With this configuration, the present invention is designed to enable an emergency stop if the door body hits an obstacle during its descent by suspending an endless body between the drive shaft, winding shaft, and tension sprocket, and yet, even if the endless body stretches during use, it is always possible to detect obstacles with a constant level of detection accuracy.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, 1 is a panel shutter installed in an opening of a building, and a plurality of panel bodies 2 forming the panel shutter 1 are shown.
A connecting chain 4 is pivotally connected in a series at a predetermined interval to a support shaft 3a of a guide roller 3 which is protruded from the upper side of both left and right edges. The guide roller 3 and both ends of the panel body 2 are guided by guide rails 5 provided on both the left and right sides of the opening, so that the panel body 2 moves up and down.
The connecting chain 4 is meshed with a take-up sprocket 7 disposed in the shutter case 6 facing the upper edge of the guide rail 5. Furthermore, the shutter case 6 has a winding sprocket 7 at one end.
A storage rail 8 is installed inside the storage rail 8, which faces the upper side of the winding side and is appropriately inclined so that the other end is lower than the one end. Then, as will be described later, by the chain winding operation of the winding sprocket 7, the guide roller 3 of the panel body 2 that has ascended the guide rail 5 is moved to the upper storage rail 8 side and placed on the storage rail 8. The panel body 2 with the guide roller 3 conveyed onto the storage rail 8 in this way rolls toward the other end of the storage rail 8 due to the weight of the panel body 2 and rolls sideways. The shutters are moved and sequentially stored in parallel in the shutter case 6.

A driven sprocket 10a is further fixed to the winding shaft 10 of the winding sprocket 7, and an endless sprocket 10a is connected between the driven sprocket 10a and a drive sprocket 12a mounted on the drive shaft 12, as will be described later. A transmission chain 13, which is an example of a body, is suspended. Furthermore, the drive shaft 12 is
Sprocket 12b and electric motor 1 mounted on shaft 2
The drive chain 15 is interlocked with the electric motor 14 via a drive chain 15 suspended between the sprocket 14a on the fourth side. When the electric motor 14 is driven, the drive shaft 12 rotates, and in response, the take-up shaft 10 also rotates to rotate the panel shutter 1.
It is designed to open and close.

By the way, the lower side of the transmission chain 13 has a relaxed shape, and a tension sprocket 17, which is configured to be vertically swingable via a support shaft 16, is engaged therewith, and the lower side of the transmission chain 13 has a relaxed shape. It is designed to apply tension to the transmission chain 13 that is connected to the transmission chain 13, and constitutes the tension member of the present invention.
Here, reference numeral 17a denotes a tension arm rotatably supported on the support shaft 16 via a bush 16c;
Reference numeral 8 denotes a tensioning bullet, and the tensioning sprocket 17 receives the biasing force of this bullet 18.
is beginning to oscillate. As described above, when driven by the electric motor 14, the drive shaft 12 winds up the transmission chain 13 from the upper side and feeds it to the lower side, that is, when it rotates in the direction of arrow A, the winding shaft 10 winds up the chain. The panel shutter 1 is rotated to the side to wind up the panel shutter 1 to the open side. On the other hand, by rotating the drive shaft 12 in the opposite direction, that is, in the direction of winding up the transmission chain from the lower side and feeding it out to the upper side (in the direction of arrow B), the take-up shaft 10 is rotated to the chain unwinding side. This causes the panel shutter 1 to move downward and close the opening.

As mentioned above, the support shaft 16 is connected to the tension arm 1.
7a, the support shaft 16 is further provided with a tension arm that swings within the range of applying the above-mentioned tension force, although it is weaker than the biasing force of the bullet 18 due to friction with the case surface, for example. Co-rotation with 17a is restricted, but if the above-mentioned tensioning force application range is exceeded due to extension of the transmission chain 13, it is possible to swing to the side that follows the projectile biasing force. A base plate 19 is rotatably supported. A detection switch 20 is attached to the base plate 19 so as to face an actuation piece 17b fixed to the tension arm 17a, and a contact portion 19a is formed protruding from the upper part of the base plate 19. . When the tension sprocket 17 is swung toward the relaxed side by the biasing force of the bullet 18 due to elongation of the transmission chain due to long-term use, etc., and the range of tension applied is exceeded, the actuating piece 17b The upper end of is the contact part 1
9a and press it, thereby causing the base plate 19
The locking means of the present invention is constructed in this way, and the tension sprocket 17 is pivoted toward the relaxed side. Even if this happens, a constant clearance can always be maintained between the operating piece 17b and the detection switch 20.

On the other hand, as described above, when an obstacle occurs during the descent of the panel shutter 1 and the descent of the panel shutter 1 is obstructed, and the rotation of the winding shaft 10 is stopped, the rotation of the winding shaft 10 is stopped. Transmission chain 1
3 is sent to the upper side to change the tension, and as a result, the tension sprocket 17 is oscillated toward the tension side against the biasing force of the projectile 18. At this time, the actuating piece 17b comes into contact with the detection switch 20 and opens, thereby stopping the drive of the electric motor 14. Note that even after the detection switch 20 is opened, if the tension sprocket 17 further swings toward the tension side beyond the switch switching stroke, the tension arm 17a
When the upper side contacts and presses the stopper 19b, the base plate 19 also swings together with the tension arm 17a, thereby preventing damage to the detection switch 20. .

In the embodiment of the present invention configured as described above, the opening and closing of the opening is automatically performed by forward and reverse rotation of the winding shaft 10 as the electric motor 14 is driven. However, when the panel shutter 1 comes into contact with an obstacle while it is descending, and the panel shutter 1 comes into contact with it and stops descending, the rotation of the winding shaft 10 also stops. However, since the electric motor 14 is being driven, the electric chain 13 is moving along the arrow B of the drive sprocket 12a.
As a result, the tension sprocket 17 on the lower side is oscillated to the tension side that resists the biasing force of the ammunition 18, that is, to the direction of arrow C. . As a result, the detection switch 20 comes into contact with the actuation piece 17b and opens, and the electric motor 14 immediately stops to perform an emergency stop of the lowering of the panel shutter 1.

On the other hand, in such an emergency stop device, if the transmission chain 13 is stretched due to long-term use, etc.
The tension sprocket 17 is swung toward the relaxed side due to exceeding the tensioning range, but in the case where the present invention is implemented, the base plate 19 on which the detection switch 20 is attached
When the contact portion 19a is pressed against the upper end of the actuating piece 17b, it swings together with the tension arm 17a, so that the detection switch 20 and the actuating piece 17
A constant clearance can always be maintained between the transmission chain 13 and the transmission chain 13. Therefore, even if the transmission chain 13 is extended, the detection accuracy remains unchanged, resulting in extremely high safety. In addition, when the winding shaft 10 is moved to adjust one side down, or when the present device is installed, the position of the detection switch 20 and the actuating piece 17b can be adjusted by simply swinging the base plate 19 to an appropriate position. In addition, it can significantly contribute to improving workability. Furthermore, in this case, if the tension sprocket 17 further swings toward the tension side after the detection switch 20 is opened, the base plate 19 also swings together with the tension arm 17a toward the tension side, and the detection switch 20 is opened. It is designed to prevent damage to the Furthermore, even if the detection switch 20 is switched by the actuating piece 17b that changes in the swinging direction, since the actuating piece 17b moves in the same direction as the swinging direction of the switch lever 20a, the detection accuracy can be made high. .

It goes without saying that the present invention is not limited to the above-mentioned embodiments, but it goes without saying that it can be used not only for panel shutters but also for commonly known automatic doors such as overhead doors and shutters.

[Operations and Effects] In summary, since the present invention is constructed as described above, when the door body is restricted from descending due to an obstacle or the like, there is no suspension between the take-up shaft, the drive shaft, and the tension member. The tension member is oscillated toward the tension side by the rotated endless body, and a detection switch fixed to the base plate detects this and performs an emergency stop of the electric motor. The base plate to which the above-mentioned detection switch is fixed will swing together with the tensioning member even if the endless body stretches during use and the tensioning member swings toward the relaxed side, so there is no clearance between the detection switch and the tensioning member. is always substantially constant, which increases the reliability of detection accuracy and provides extremely high safety.

[Brief explanation of drawings]

The drawings show an embodiment of an emergency stop device for an automatic door according to the present invention, in which Fig. 1 is a schematic perspective view of a panel shutter, Fig. 2 is an inner side view of the shutter case part, Figures 3, 4, and 5 are a front view, a bottom view, and a vertical sectional view of the main parts, respectively.
Figures 6A, B, and C are plan views of the base plate, respectively;
They are a front view and a side view. In the figure, 1 is a panel shutter, 2 is a panel body,
10 is a winding shaft, 12 is a drive shaft, 13 is a transmission chain, 14 is an electric motor, 16 is a support shaft, 17 is a tension sprocket, 17b is an operating piece, 18 is a bullet, 19 is a base plate, and 19a is The contact portion 20 is a detection switch.

Claims (1)

[Scope of utility model registration request] An endless body is suspended between a drive shaft interlockingly connected to the electric motor side, a winding shaft interlockingly connected to the door body, and a tension member that swings under the biasing force of the bullet,
In an automatic door configured to automatically open and close the door body as driven by an electric motor via an endless body tensioned by applying tension force by the swinging tension member, the tension member When the winding shaft comes into contact with an obstacle and the rotation of the winding shaft stops, the tension changes on the endless body, so that the swinging of the tension member that follows the tension change resists the biasing force of the bullet. In addition, the swinging support shaft of the tensioning member is provided with a swinging support shaft that does not interfere with the tensioning member that swings within the range of applying the tensioning force, but the range of applying the tensioning force is changed based on the extension of the endless body. The base plate, which swings integrally with the tensioning member by interfering with the tensioning member that swings in the direction of the biasing force of the bullet, is pivotally supported. It does not interfere with the tension member that swings within the range, but it interferes with the tension member that swings in the direction of resisting the bomber biasing force beyond the range of applying tension due to the door body contacting an obstacle. 1. An emergency stop device for an automatic door, characterized in that a detection switch that switches to perform an emergency stop of an electric motor is fixed thereto.