JPH056094U - Obstacle detection device for shutter - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain an obstacle detection device for a shutter that can distinguish between a floor and an obstacle with high accuracy. When the sensing lever 26 comes into contact with an obstacle 64, the pressing member 56 presses the tape switch 62 to turn it on (see (A) in the selection diagram). A stopper 66 is provided so as to cover the tape switch 62 at a portion pressed by the pressing member 56 when the sensing lever 26 comes into contact with the floor surface 16, and the tape when the sensing lever 26 comes into contact with the floor surface 16 is provided. The switch 62 is prevented from turning on (see (B) of the selection diagram). Since the position of the stopper 66 does not move even if the length dimension of the tape switch 62 expands or contracts, the boundary where the tape switch 62 turns on and off does not change.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shutter obstacle detection device.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, an obstacle detection device for a shutter is known that detects contact between the shutter curtain and an obstacle when the shutter curtain descends. In a shutter equipped with a shutter obstacle detection device, the movement of the shutter curtain is reversed or stopped when an obstacle is detected by the shutter obstacle detection device. The shutter obstacle detection device has a sensing lever that is provided at the lower end of the shutter curtain and that rotates when it contacts the obstacle or the floor when the shutter curtain descends. In addition, a long tape switch is provided along the guide rail of the shutter curtain so as to have a predetermined space between the lower end and the floor surface. This tape switch turns on when pressed.

In the above obstacle detection device for shutters, when the sensing lever comes into contact with the obstacle and is rotated, the pressing member connected to the sensing lever presses the tape switch to turn it on. Further, when the sensing lever comes into contact with the floor and is rotated, the pressing member presses the lower part of the lower end of the tape switch, so that the tape switch does not turn on. In this way, the tape switch is turned on only when the sensing lever comes into contact with the obstacle, and can detect the presence or absence of the obstacle when the shutter curtain descends.

[0004]

[Problems to be solved by the device]

 However, the tape switch has its length dimension expanded and contracted under the influence of ambient temperature and humidity, and the interval dimension changes. Along with this, when the sensing lever contacts an obstacle or the floor, the boundary at which the tape switch turns on and off changes. For example, if the length of the tape switch becomes large and the gap becomes small, the tape switch may turn on even though the sensing lever contacts the floor, and it is determined that the tape switch is in contact with an obstacle. The malfunction of the shutter curtain movement may be reversed. Also, for example, if the length of the tape switch becomes smaller and the gap becomes larger, the pressing member will move below the lower end of the tape switch even if the sensing lever contacts an obstacle near the floor. The pressing may cause a disadvantage that the tape switch does not turn on. In this way, the boundary where the tape switch is turned on and off fluctuates under the influence of the ambient temperature and humidity, so it was not possible to distinguish the obstacle from the floor with high accuracy.

Further, there is an obstacle detection device for a shutter provided with a program type limit switch that is turned on / off according to the rotation speed of a shutter curtain drive motor. In this obstacle detection device for shutters, the shutter curtain is moved upward when the sensing lever is rotated while the programmable limit switch is detecting the rotation speed corresponding to the obstacle. However, the distinction between the floor and the obstacle depends on the boundary of ON / OFF of the programmable limit switch, and the rotation speed at which the lower end of the shutter curtain is at the height position that separates the floor from the obstacle and the programmable limit switch. It was necessary to make an accurate adjustment so that the boundary to be turned on and off would match, and the adjustment work was complicated.

The present invention has been made in consideration of the above facts, and an object thereof is to obtain an obstacle detection device for a shutter that can distinguish a floor from an obstacle with high accuracy.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, an obstacle detection device for a shutter according to the present invention comprises a tape switch which is provided along a guide rail and is turned on by being pressed, and a lower end of a shutter curtain which is guided and moved by the guide rail. A moving member which is provided in a section and is moved by contacting an obstacle or the floor when the shutter curtain descends; a pressing member which presses the tape switch as the moving member moves; and a moving member contacts the floor. In this case, the stopper is fixed to the guide rail so as to cover the portion of the tape switch that the pressing member presses, and the stopper stops the turning on of the tape switch.

[0008]

[Action]

 In the present invention, the stopper for blocking the turning on of the tape switch is fixed to the guide rail so as to cover the portion of the tape switch which the pressing member presses when the moving member touches the floor. For this reason, even if the length of the tape switch expands and contracts due to the influence of ambient temperature and humidity, the position of the stopper does not move, and the boundary where the tape switch turns on and off does not fluctuate and is always constant. Therefore, the floor and the obstacle can be distinguished with high accuracy. In addition, the workability is improved because it does not require complicated adjustment work such as a programmable limit switch.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a shutter provided with an obstacle detection device for a shutter according to the present invention. The shutter curtain 12 is configured to move up and down with its both ends guided by guide rails 18 having a substantially U-shaped cross section that is hung from the lintel 14 to the floor 16. The upper end of the shutter curtain 12 is attached to the winding shaft 20. When the winding shaft 20 is rotated by the motor 22 via the chain 24, the shutter curtain 12 is wound or pulled out, and the shutter curtain 12 is vertically moved. A brake (not shown) is installed inside the motor 22 to stop the rotation of the rotary shaft of the motor when power is not supplied to the motor 22.

A control device 34 is arranged at the upper end of the guide rail 18. An operation unit 38 is connected to the control unit 34 via a signal line 36. The operation device 38 is provided with operation switches 40, 42 and 44 for instructing the shutter curtain 12 to rise (open), descend (close) and stop. A position detection unit 32 equipped with an upper limit switch 46 for detecting the upper limit position (fully open position) and a lower limit limit switch 48 for detecting the lower limit position (fully closed position) of the shutter curtain 12 is installed near the motor 22. Has been. The position detecting unit 32 has a shaft which is formed with a male screw on the outer periphery thereof and is rotated by transmitting the rotational force of the motor 22 through a gear 33. The limit switches 46 and 48 are attached to both ends of the moving range of the moving block. Therefore, if the moving range of the moving block and the moving range of the shutter curtain 12 are associated with each other, the fully open and fully closed positions of the shutter curtain 12 can be detected. The upper and lower limit switches 46 and 48 are connected to the control device 34.

As shown in FIG. 2, the shutter curtain 12 has a thin wall thickness in the vicinity of one corner portion housed in the guide rail 18 on the lower end side, and a bracket 28 is attached to this thin wall portion. There is. A bracket (not shown) is similarly attached near the other corner on the lower end side of the shutter curtain 12, and a shaft 30 is stretched between the brackets. The shaft 30 is rotatably supported by a pair of brackets. Further, a sensing lever 26 as a moving member is arranged at a lower end portion of the shutter curtain 12 between the pair of guide rails 18 (see FIG. 1). The sensing lever 26 has a substantially U-shaped cross section and is formed to extend along the width direction of the shutter curtain 12. One end of the U-shaped portion of the sensing lever 26 is fixed to the shaft 30, and the sensing lever 26 rotates integrally with the shaft 30. A flange portion 26A is formed on the other end of the U-shaped portion of the sensing lever 26.

On the other hand, as shown in FIG. 3, a support member 50 projecting below the shutter curtain 12 is provided at the lower end portion of the shutter curtain 12, and the flange portion 26 A is provided at the front end portion of the support member 50. A corresponding flange portion 50A is formed. The flange portion 50A contacts the flange portion 26A, and restricts the rotation of the sensing lever 26 in the direction of arrow A in FIG. 3 to the position shown in FIG. In the state shown in FIG. 3, since the sensing lever 26 projects most from the lower end of the shutter curtain 12, when the shutter curtain 12 descends, if there is an obstacle on the movement trajectory of the shutter curtain 12, this will occur. When the obstacle comes into contact with the floor surface 16 when there is no obstacle, the floor surface 16 is brought into contact therewith and is rotated in the direction of arrow B in FIG.

As shown in FIG. 2, a pair of brackets 52, 54 are fixed to the portion of the shaft 30 accommodated in the guide rail 18, and the pair of brackets 52, 54 are arranged via the shaft 30. The pressing member 56 composed of rollers and the like is supported. One ends of compression coil springs 58 and 60 are attached to the brackets 52 and 54, respectively, and the other ends of the compression coil springs 58 and 60 are attached to the lower end of the shutter curtain 12. Therefore, the urging force of the compression coil springs 58 and 60 for rotating the brackets 52 and 54, the pressing member 56, the shaft 30, and the sensing lever 26 in the direction of arrow A in FIG. 26A and the flange portion 50A are brought into contact with each other to maintain the state shown in FIG.

On the other hand, as shown in FIG. 2, inside the guide rail 18, a tape switch 62 is arranged along the guide rail 18. The tape switch 62 is composed of a pair of electrodes provided along the longitudinal direction of the tape switch 62 and a rubber which is arranged between the electrodes and contains a large number of granular conductors inside, and is pressed from the outside. Then, the rubber is compressed and deformed, the conductors and the conductor and the electrodes come into contact with each other, and the electrodes are electrically connected to each other to turn on. The pair of electrodes of the tape switch 62 are connected to the control device 34. As shown in FIG. 5A, when the sensing lever 26 comes into contact with the obstacle 64 and the sensing lever 26 is rotated in the direction of arrow C in FIG. 5 against the biasing force of the compression coil spring, the shaft 30 is moved. The brackets 52 and 54 and the pressing member 56 are also rotated in the direction of arrow D in FIG. 5, and the pressing member 56 contacts the tape switch 62 to further press the tape switch 62. This turns on the tape switch 62.

Further, a stopper 66 is fixed to the inner wall surface of the guide rail 18 and arranged at a portion pressed by the pressing member 56 when the sensing lever 26 contacts the floor. As shown in FIG. 4, the stopper 66 is made of hard synthetic resin and has a hollow interior, and the lower end of the tape switch 62 is housed in the hollow portion so as to cover the tape switch 62. Since a predetermined space is provided between the stopper 66 and the tape switch 62, the position of the stopper 66 is changed even if the length dimension of the tape switch 62 expands or contracts due to the influence of the ambient temperature and humidity. Therefore, the tape switch 62 is not loosened. When the sensing lever 26 comes into contact with the floor surface 16 as shown in FIG. 5B, the pressing member 56 presses the stopper 66, but since the stopper 66 is hard as described above, the outer shape is deformed. The tape switch 62 is not pressed, and the tape switch 62 is prevented from turning on.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. The flowchart of FIG. 6 is executed when the operation switch 42 for instructing the lowering (closing) of the shutter curtain 12 is turned on.

In step 100, the motor 22 is driven to move the shutter curtain 12 in the descending direction. In step 102, it is determined whether or not the tape switch 62 is turned on. If the determination in step 102 is negative, the process proceeds to step 104, and in step 104, it is determined whether or not the operation switch 44 for instructing the movement stop of the shutter curtain 12 is turned on. When the determination in step 104 is negative, it is determined in the next step 106 whether the lower limit switch 48 is turned on. If the determination in step 106 is negative, the process returns to step 100, and the shutter curtain is moved in the descending direction until any of the tape switch 62, the operation switch 44, and the lower limit switch 48 is turned on.

When an obstacle is present on the movement trajectory of the shutter curtain 12, the sensing lever 26 is moved in contact with the obstacle, and the pressing member 56 presses the tape switch 62. As a result, the tape switch 62 is turned on, the determination in step 102 is confirmed, and the process proceeds to step 110. In step 110, the moving direction of the shutter curtain 12 is reversed and moved in the ascending direction. Thereby, for example, when the obstacle is a human, the safety of the human is secured.

Further, when the operation switch 44 is operated and the movement stop of the shutter curtain 12 is instructed, the determination in step 104 is affirmative, and the movement of the shutter curtain 12 is stopped in step 108 to end the processing. .. If the lower end of the shutter curtain 12 comes into contact with the floor surface and the lower limit switch 48 is turned on, the determination in step 106 is affirmative, and the movement of the shutter curtain 12 is stopped in step 108 as described above. The process ends.

Here, in this embodiment, since the stopper 66 is fixed to the inner wall surface of the guide rail 18, the change in the length dimension of the tape switch 62 does not change the boundary at which the tape switch 62 is turned on and off. The shutter does not malfunction in the above process. For example, when the length of the tape switch 62 becomes large due to the influence of ambient temperature and humidity, conventionally, even though the sensing lever 26 contacts the floor surface 16, the tape switch 62 is pressed by the pressing member 56. When the shutter curtain 12 is turned on, a malfunction such as a reversal of the moving direction of the shutter curtain 12 may occur. However, in this embodiment, the stopper 66 does not press the tape switch 62, so that the malfunction may occur. There is no. Also, for example, when the length of the tape switch 62 is reduced due to the influence of ambient temperature and humidity, the tape switch 62 does not turn on with respect to an obstacle existing near the floor surface 16 in the past and the shutter curtain 12 Although an obstacle may be sandwiched between the floor and the floor, in the present embodiment, the length of the tape switch 62 is set differently because the floor and the obstacle are not distinguished from each other by the length of the tape switch 62. It can be set longer than before, and the above inconvenience does not occur.

As described above, in this embodiment, the stopper 66 for preventing the tape switch 62 from being turned on is provided with the guide rail so as to cover the tape switch 62 at the portion pressed by the pressing member 56 when the sensing lever 26 contacts the floor. 18 is fixed to the inner wall surface. Therefore, even if the length dimension of the tape switch 62 expands or contracts due to the influence of ambient temperature and humidity, the boundary where the tape switch 62 turns on and off does not change, and the floor and obstacle can be distinguished with high accuracy. It can be done and the shutter does not malfunction. Also, it does not require complicated adjustment work such as the program type limit switch.

[0022]

[Effect of the device]

 As described above, in the present invention, since the stopper is provided so as to cover the tape switch of the portion pressed by the pressing member when the moving member comes into contact with the floor, the floor and the obstacle can be distinguished with high accuracy. It is possible to obtain an excellent effect.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of a shutter including a shutter obstacle detection device according to the present invention.

FIG. 2 is a cross-sectional view near a guide rail.

FIG. 3 is a schematic diagram showing a schematic configuration in the vicinity of a sensing lever and a pressing member.

FIG. 4 is a perspective view showing the vicinity of a stopper mounting portion.

FIG. 5A is a schematic view showing a state in which the pressing member is pressing the tape switch, and FIG. 5B is a schematic view showing a state in which the pressing member is pressing the stopper.

FIG. 6 is a flowchart illustrating the operation of this embodiment.

[Explanation of symbols]

 12 Shutter curtain 18 Guide rail 26 Sensing lever 56 Pressing member 62 Tape switch 66 Stopper

Claims (1)

Claims for utility model registration: 1. A tape switch which is provided along a guide rail and is turned on when pressed, and a shutter which is provided at a lower end portion of a shutter curtain which is guided and moved by the guide rail. A moving member that moves while contacting an obstacle or the floor when the curtain descends, a pressing member that presses the tape switch with the movement of the moving member, and the pressing member when the moving member contacts the floor. An obstacle detecting device for a shutter, comprising: a stopper fixed to the guide rail so as to cover the tape switch at a portion to be pressed, and a stopper for preventing the tape switch from being turned on.