JP2596479Y2 - Obstacle detection device for shutter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter obstacle detecting device.

[0002]

2. Description of the Related Art Conventionally, there has been known a shutter obstacle detecting device for detecting contact between a shutter curtain and an obstacle when the shutter curtain is lowered. In the shutter including the shutter obstacle detection device, when an obstacle is detected by the shutter obstacle detection device, the movement of the shutter curtain is reversed or stopped. The shutter obstacle detection device includes a sensing lever that is provided at a lower end of the shutter curtain and that rotates when the shutter curtain descends and comes into contact with an obstacle or the floor. 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. This tape switch is turned on by being pressed.

In the above obstacle detecting device for a shutter, when the sensing lever is rotated by touching the obstacle, a pressing member connected to the sensing lever presses the tape switch to turn it on. Further, when the sensing lever is rotated by touching the floor, the pressing member presses below the lower end of the tape switch, so that the tape switch does not turn on. As described above, 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 is lowered.

[0004]

However, the length of the tape switch expands and contracts under the influence of the ambient temperature and humidity, and the distance changes. Accordingly, the boundary at which the tape switch is turned on and off when the sensing lever contacts an obstacle or the floor varies. For example, when the length of the tape switch is increased and the distance is reduced, the tape switch may be turned on even though the sensing lever is in contact with the floor, and the shutter is determined to have contacted with an obstacle. A malfunction may occur in which the movement of the curtain is reversed. Further, for example, when the length of the tape switch is reduced and the interval is increased, the pressing member presses below the lower end of the tape switch even if the sensing lever contacts an obstacle existing near the floor. This may cause a disadvantage that the tape switch does not turn on. As described above, the boundary at which the tape switch is turned on and off varies due to the influence of the surrounding temperature and humidity, so that it is not possible to distinguish the obstacle from the floor with high accuracy.

There is also a shutter obstacle detecting device provided with a programmable limit switch that is turned on and off according to the number of rotations of a shutter curtain driving motor. In this shutter obstacle detection device, the shutter curtain is moved up 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 on / off boundary of the programmable limit switch, and the number of revolutions at which the lower end of the shutter curtain separates the floor from the obstacle, and the on / off of the programmable limit switch. It is necessary to make accurate adjustments so that the boundary to be adjusted coincides, and the adjustment work is complicated.

The present invention has been made in view of the above-mentioned facts, and has as its object to provide an obstacle detecting device for a shutter which can distinguish a floor from an obstacle with high accuracy.

[0007]

According to the present invention, there is provided a shutter obstacle detecting device according to the present invention, which is provided along a guide rail and is turned on by being pressed. A moving member provided at a lower end portion of the shutter curtain that is guided and moved, and is moved in contact with an obstacle or a floor when the shutter curtain is lowered; and a moving member that is provided at a lower end portion of the shutter curtain and moves with the moving member. wherein a pressing member for pressing the tape switch, Tokoro the site of the tape switch the moving member is the pressing member is pressed when in contact with the floor Te
A stopper that is fixed to the guide rail so as to cover the tape switch at that portion at regular intervals and that prevents the tape switch from being turned on.

[0008]

According to the present invention, the stopper for preventing the tape switch from being turned on is provided at a predetermined distance from the tape switch at a position pressed by the pressing member when the moving member comes into contact with the floor.
It is fixed to the guide rail so as to cover the tape switch of the position . Therefore, even if the length of the tape switch expands and contracts under the influence of the surrounding temperature and humidity, the position of the stopper does not move, and the boundary where the tape switch is turned on and off does not change and is always constant. Therefore, the floor and the obstacle can be distinguished with high accuracy. In addition, operability is also improved because complicated adjustment work or the like is not required unlike a program type limit switch. In addition, since the moving member and the pressing member that move in contact with the obstacle or the floor when the shutter curtain descends are provided at the lower end of the shutter curtain, the size of the moving member and the pressing member when the shutter curtain is wound up. There is no need to consider pods and shapes,
The winding structure of the shutter curtain can be prevented from becoming complicated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a shutter provided with the shutter obstacle detecting device according to the present invention. The shutter curtain 12 is configured so that both ends are guided by a guide rail 18 having a substantially U-shaped cross section that extends from the lintel portion 14 to the floor surface 16 and moves up and down. The upper end of the shutter curtain 12 is attached to the winding shaft 20. The winding shaft 20 is connected to the chain 24
The shutter curtain 12 is wound up or pulled out by being rotated by the motor 22 through the, and the shutter curtain 12 is moved up and down. The motor 2
A brake (not shown) for stopping the rotation of the rotating shaft of the motor 22 when power is not supplied to the motor 22 is mounted inside the unit 2.

The control device 3 is provided at the upper end of the guide rail 18.
4 are provided. An operation device 38 is connected to the control device 34 via a signal line 36. Operation switches 40 and 42 for instructing the shutter curtain 12 to rise (open), descend (close), and stop the shutter 38 are provided on the operation device 38.
44 are provided. In the vicinity of the motor 22, an upper limit switch 46 for detecting an upper limit position (fully open position) of the shutter curtain 12 and a lower limit position (fully closed position).
The position detecting unit 32 provided with the lower limit switch 48 for detecting the position is mounted. The position detection unit 32 includes a shaft that has an external thread formed on the outer periphery and rotates by transmitting the rotational force of the motor 22 through the gear 33, a moving block that is screwed into the external thread and moves in the axial direction by rotation of the shaft. , And the limit switches 46 and 48 are mounted at 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 correspond to 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 controller 34.

As shown in FIG. 2, the shutter curtain 1
Reference numeral 2 denotes a thinner portion near one corner portion accommodated in the guide rail 18 on the lower end side, and a bracket 28 is attached to the thinner portion. A bracket (not shown) is similarly mounted near the other corner on the lower end side of the shutter curtain 12, and a shaft 30 extends between the two brackets. The shaft 30 is rotatably supported by a pair of brackets. A sensing lever 2 as a moving member is provided at a portion between the pair of guide rails 18 at the lower end of the shutter curtain 12.
6 are arranged (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,
The sensing lever 26 rotates integrally with the shaft 30. A flange 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 lower end of the shutter curtain 12 is provided with a support member 50 projecting downward from the shutter curtain 12, and a front end of the support member 50 corresponds to the flange 26A. A 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. FIG.
In the state shown in FIG.
2, when the shutter curtain 12 descends, when there is an obstacle on the movement trajectory of the shutter curtain 12, the shutter curtain 12 contacts this obstacle,
When there is no obstacle, it is rotated in the direction of arrow B in FIG.

As shown in FIG. 2, a pair of brackets 52 and 54 are fixed to a portion of the shaft 30 housed in the guide rail 18, and the pair of brackets 52 and 54 are connected via the shaft 30. The pressing member 56 composed of a roller or the like is supported. Bracket 52,
One end of each of the compression coil springs 58 and 60 is attached to 54, and the other end of each of the compression coil springs 58 and 60 is attached to the lower end of the shutter curtain 12. For this reason, the brackets 52 and 54, the pressing member 56, the shaft 3
The urging force of the compression coil springs 58, 60 for rotating the shaft 0 and the sensing lever 26 in the direction of the arrow A in FIG. 3 around the shaft 30 is applied, but the state shown in FIG. 3 due to the contact between the flange 26A and the flange 50A. Is held.

On the other hand, as shown in FIG.
Inside, a tape switch 62 is provided 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 rubber disposed between the electrodes and containing a large number of granular conductors inside, and is pressed from the outside. Then, the rubber is compressed and deformed, and the conductors and the conductor and the electrodes come into contact with each other. A pair of electrodes of the tape switch 62 is connected to the control device 34. FIG.
As shown in FIG. 5A, when the sensing lever 26 comes into contact with the obstacle 64 and the sensing lever 26 is turned in the direction of arrow C in FIG. 52, 54 and the pressing member 56 are also rotated in the direction of arrow D in FIG.
, And further presses the tape switch 62. As a result, the tape switch 62 is turned on.

A stopper 66 is fixed to the inner wall surface of the guide rail 18 at a position pressed by the pressing member 56 when the sensing lever 26 comes into contact with the floor. As shown in FIG. 4, the stopper 66 is made of a hard synthetic resin and has a hollow inside. The lower end of the tape switch 62 is accommodated in the hollow portion so as to cover the tape switch 62. Since a predetermined interval is provided between the stopper 66 and the tape switch 62, the position of the stopper 66 is changed even if the length of the tape switch 62 expands and contracts due to the influence of the surrounding temperature, humidity, and the like. , Tape switch 6
There is no slack in 2. When the sensing lever 26 contacts the floor 16 as shown in FIG.
6 presses the stopper 66, but since the stopper 66 is hard as described above, the outer shape is not deformed and the tape switch 62 is not pressed, and the ON operation of the tape switch 62 is prevented.

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

In step 100, the motor 22 is driven to move the shutter curtain 12 in the downward direction. In step 102, it is determined whether or not the tape switch 62 has been turned on. If the determination in step 102 is negative, the process proceeds to step 104, and in step 104, it is determined whether the operation switch 44 for instructing the shutter curtain 12 to stop moving has been turned on. If the determination in step 104 is negative, it is determined in next step 106 whether the lower limit switch 48 has been turned on.
If the determination in step 106 is negative, step 1
00, the tape switch 62, the operation switch 44,
The shutter curtain is moved in the descending direction until one of the lower limit switches 48 is turned on.

When an obstacle is present on the locus of movement of the shutter curtain 12, the sensing lever 26 is moved in contact with the obstacle, and the pressing member 56 is moved by the tape switch 6.
Press 2. As a result, the tape switch 62 is turned on, and the determination in step 102 is affirmed. In step 110, 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 ensured.

If the operation switch 44 is operated to instruct the shutter curtain 12 to stop moving, the determination in step 104 is affirmed, and in step 108, the movement of the shutter curtain 12 is stopped and the process is terminated.
If the lower end of the shutter curtain 12 touches the floor surface and the lower limit switch 48 is turned on, the determination in step 106 is affirmative, and step 108 is performed in the same manner as above.
Then, the movement of the shutter curtain 12 is stopped, and the process ends.

In this embodiment, since the stopper 66 is fixed to the inner wall surface of the guide rail 18, the boundary at which the tape switch 62 is turned on and off does not change due to a change in the length of the tape switch 62. The shutter does not malfunction in the processing. For example, when the length of the tape switch 62 becomes large due to the influence of the surrounding temperature and humidity, conventionally, the tape switch 62 is turned on by being pressed by the pressing member 56 despite the fact that the sensing lever 26 is in contact with the floor 16. However, a malfunction such as a reversal of the moving direction of the shutter curtain 12 may occur.
In this embodiment, the tape switch 62 is
Is prevented from malfunctioning. Also, for example, when the length of the tape switch 62 is reduced due to the influence of the surrounding temperature and humidity, the tape switch 62 is not turned on with respect to the obstacle existing in the vicinity of the floor 16 and the shutter Although an obstacle may be sandwiched between the floor and the floor, in this embodiment, the length of the tape switch 62 is made smaller than that of the related art because the distinction between the floor and the obstacle does not depend on the length of the tape switch 62. Can be set longer, and the above-described 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 sensing lever 26.
Is fixed to the inner wall surface of the guide rail 18 so as to cover the tape switch 62 at the position where the pressing member 56 presses when it contacts the floor. Therefore, even if the length of the tape switch 62 expands and contracts under the influence of the surrounding temperature and humidity, the boundary where the tape switch 62 is turned on and off does not change, and the floor and the obstacle can be distinguished with high accuracy. And the shutter does not malfunction. In addition, complicated adjustment work and the like as in the case of a programmable limit switch are not required.

[0022]

As described above, according to the present invention, when the moving member comes into contact with the floor, the tape switch of the portion pressed by the pressing member is separated from the tape switch of the portion by a predetermined interval.
A stopper is provided to cover the
The length of the tape switch expands and contracts under the influence of humidity.
Even if the stopper position does not move, the tape switch is turned on
The boundary to be turned off is always constant, and an excellent effect that the floor and the obstacle can be distinguished with high accuracy can be obtained. In addition, since the moving member and the pressing member that move in contact with the obstacle or the floor when the shutter curtain descends are provided at the lower end of the shutter curtain, the size of the moving member and the pressing member when the shutter curtain is wound up. There is no need to consider the size and shape of the shutter curtain, and an excellent effect of avoiding complication of the winding structure of the shutter curtain can be obtained.

[Brief description of the drawings]

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

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

FIG. 3 is a schematic diagram showing a schematic configuration near a sensing lever and a pressing member.

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

5A is a schematic diagram illustrating a state where a pressing member is pressing a tape switch, and FIG. 5B is a schematic diagram illustrating a state where a pressing member is pressing a stopper.

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

[Explanation of symbols]

 12 shutter curtain 18 guide rail 26 sensing lever 56 pressing member 62 tape switch 66 stopper

Claims (1)

(57) [Scope of request for utility model registration] 1. A tape switch provided along a guide rail and turned on when pressed, and an obstacle or floor provided at a lower end of a shutter curtain guided and moved by the guide rail when the shutter curtain is lowered. A moving member that is moved by contacting the moving member; a pressing member that is provided at a lower end of the shutter curtain and presses the tape switch as the moving member moves; and a pressing member that moves when the moving member comes into contact with the floor. At a predetermined interval from the tape switch of the part pressed by
A shutter fixed to the guide rail so as to cover the switch and preventing a tape switch from being turned on;