JPH0988459A - Obstacle sensing device for shutter - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] When an obstacle is present in an opening, the obstacle can be sensed promptly and controlled to a safe side. SOLUTION: The shutter is detected by a lower limit position detecting means 7 when the shutter reaches a lower limit position during a closing operation. The opening / closing switch 2 that opens and closes the shutter is detected by the rotation amount detecting means 6 when the rotation amount reaches the lower limit position of the shutter. When the lower limit position detecting means 7 does not detect the shutter lower limit position and the rotation amount detecting means 6 has a rotation amount corresponding to the lower limit position of the shutter,
It determines that there is an obstacle at the lower end of the opening and controls the shutter to the safe side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an obstacle sensing device for a shutter that senses an obstacle in the opening of the shutter and controls the shutter operation.

[0002]

2. Description of the Related Art FIG. 10 is a front view showing a shutter. The shutter 41 for raising and lowering the opening 40 is provided with an obstacle sensing device 42 for safely controlling the shutter 41 when an obstacle is sensed during the raising and lowering. As the obstacle detection device 42, the opening / closing device 4 of the shutter 41 is used.
The type that senses the load applied to item 3 is cheap in cost and widely used. In this method, the current value of the switch 43 is sensed, or the rotation amount is detected by using a tacho generator or an encoder, and the shutter 41 is moved in a safe direction, that is, stopped or reversed and raised from the decrease in the rotation amount. Has become.

[0003]

However, since the shutter 41 has a backlash at the connecting portion of the slats 41a, the seat plate 41b at the lower end of the shutter 41 does not move to the opening / closing device 43 at the upper end of the shutter 41 after hitting an obstacle. Until the load is applied, it will be after this play has been reduced, so it took time and we could not expect improvement in safety.

In particular, the shutter 41 having a small size is
Since the slats are light, as shown in FIG. 11 (a), the slack inside the shutter box or the reverse winding as shown in FIG. 11 (b) causes the load to be transmitted to the opening / closing device 43. Will take even longer. At this time, the shutter 41 may be damaged.
The obstacles often come into contact with the shutter at the lowermost end position of the opening 40, and it has been desired that the obstacle can be accurately detected at the lower end position.

The present invention has been made in order to solve the above problems, and when an obstacle is present in the opening, it is possible to detect this obstacle quickly and control it to the safe side. Is intended to provide.

[0006]

In order to achieve the above object, a shutter obstacle detecting apparatus according to the present invention is provided.
As described, a shutter (1) composed of a plurality of slats and capable of moving up and down an opening (10), an opening / closing device (2) for driving the opening and closing of the shutter, and a rotation for detecting a rotating state of the opening and closing device. An amount detecting means (6), a lower limit position detecting means (7) for detecting when the shutter reaches the lower limit position, and a lower limit position detecting means for closing the shutter when the shutter is closed. Prior to the detection of reaching, the rotation amount detecting means determines that there is an obstacle at the lower end portion of the opening when the rotation amount corresponding to the lower limit position of the shutter is reached, and performs safety control to stop the shutter at least. And a control unit (4).

Further, as described in claim 2, the rotation amount detecting means (6) includes a rotation shaft (2a) of the switch (2).
And a detection signal is output when the opening / closing switch reaches the rotation amount corresponding to the lower limit position of the shutter.

The rotation amount detecting means (6) is composed of a counter (6b) which counts according to the rotation of the switch, and a count value corresponding to the lower limit position of the shutter (1) is preset and set. The detection signal may be output when the value is reached.

Further, in the lower limit position detecting means (7), the detector provided at the lower end of the guide rail (1b) of the shutter (1) has a lower end of the shutter (1). Of the seat plate (1a) of
The lower limit position detecting means (7) according to claim 5.
Can be configured such that a detector provided on the lower end of the guide rail (1b) of the shutter (1) detects a detection body provided on the seat plate (1a) at the lower end of the shutter (1). .

The detector of the lower limit position detecting means (7) may be composed of a proximity switch (7a) to detect the approach of the magnet (7b) as the detection body.

According to the above structure, when the shutter 1 descends through the opening 10, if the lower end of the opening 10 has an obstacle, the lower limit position detecting means 7 determines that the seat plate 1a has reached the lower limit position. Does not detect. However, since the opening / closing device 2 continues to rotate due to the amount of rattling of the slats, slack, etc., the rotation amount detecting means 6 detects that the opening / closing device 2 has a rotation amount corresponding to the lower limit position. When the lower limit position detection means 7 and the rotation amount detection means 6 are in the above output state, the control unit 4 determines that there is an obstacle, stops the shutter 1, or reverses and raises it, and controls the shutter 1 in the safe direction. .

Next, the shutter obstacle sensing device of the present invention comprises a plurality of slats as claimed in claim 7 and is capable of moving the opening (10) up and down freely.
An opening / closing device (2) for opening and closing the shutter, and a rotation amount detecting means (16) for detecting a rotation state of the opening and closing device,
Shutter position detecting means (17) for detecting the lowered position of the seat plate (1a) of the shutter at each position at predetermined intervals.
When the shutter is closed, the opening portion is provided when the rotation amount detection means reaches the rotation amount corresponding to each position of the shutter before the shutter position detection means detects that the shutter reaches each position. And a control unit (14) which determines that there is an obstacle at the height position of the shutter position detection means and performs safety control to stop at least the shutter.

The rotation amount detecting means (16) is connected to the rotating shaft of the opening / closing device (2) and decelerates the rotation of the opening / closing device within one rotation corresponding to the opening / closing stroke of the shutter (1). The gearbox (16a) and a potentiometer (16b) connected to the gearbox for outputting a position signal corresponding to the opening / closing position of the shutter.

The shutter position detecting means (17) is
A plurality of detectors (17A) provided at predetermined intervals in the height direction along the guide rail (1b) of the shutter (1).
.About.17F) and a detector (7b) provided on the seat plate (1a) of the shutter, and a detection signal can be output when the seat plate passes each detector part.

According to the above construction, when the shutter 1 descends through the opening 10, if there is an obstacle of a predetermined height in the opening 10, the shutter position detection one step below the height of the obstacle is detected. Means 17 (eg detector 17E) is seat plate 1
a cannot be detected. However, since the opening / closing device 2 continues to rotate due to the amount of rattling of the slats and slack, the rotation amount detecting means 1
6, the switch 2 detects the amount of rotation corresponding to the arrangement position of the detector 17E. When the shutter position detection means 17 and the rotation amount detection means 16 have the above detection outputs, the control unit 14 determines that there is an obstacle at the position where the detector 17E is disposed, and stops or reverses the shutter 1. The shutter 1 is raised and the shutter 1 is controlled in the safe direction.

[0016]

1 is a front view showing a first embodiment of an obstacle detecting device for a shutter according to the present invention. In the first embodiment, particularly when there is an obstacle at the lower end position of the opening 10, the obstacle can be detected without depending on the load detection of the switchgear 2. The shutter 1 that moves up and down the opening 10 can be moved up and down by the rotation of the opening / closing device 2, and the opening / closing device 2 is controlled by the operation of the operation switch 3 via the control unit 4.

FIG. 2 is a block diagram showing the control unit 4. The control unit 4 is a controller 4a including an MPU.
And the shutter 1 is controlled by the controller 4a.
Control the up and down of. The control unit 4 is connected to the operation switch 3 for opening / closing and stopping the shutter 1 and an opening / closing device 2 such as a motor, and a change in the rotational state of the opening / closing device 2 is detected by the load sensing unit 5. It is like this. The rotation number of the switch 2 is counted by the rotation amount detection means 6 such as a counter. On the other hand, the lower limit position of the shutter 1 is detected by the lower limit position detecting means 7.

As shown in FIG. 3, the load sensing unit 5 detects the rotation state of the switch 2, and the rotation of the disk-shaped magnet 5a having an NS pole fixed to the rotation shaft 2a is detected on the side. The Hall IC 5b is used for detection, and the controller 4a outputs a load detection signal as if the load was applied to the switch 2 when the switch 2 has reached a predetermined rotation speed due to the decrease in the rotation speed. . When the load is sensed, the load sense signal in the ON state is correspondingly output. The load sensing unit 5 may also be configured to sense an overcurrent when the switchgear 2 is overloaded, or to sense an overload by reducing the rotation speed using a tachogenerator. In the figure, 2c is a gear head having a speed reducer connected to the shutter 1 side.

The rotation amount detecting means 6 is composed of, for example, a counter 6b connected via a gear 6a fixed to a rotating shaft 2a of the opening / closing device 2. The counter 6b is provided in the shutter 1 when the shutter 1 is installed. Reset (count 0) at the lower limit position (fully closed state). When the count is 0,
Output an ON signal. The actual rotation state of the switch 2 can be obtained from the count value of the rotation amount detection means 6. still,
In addition, the rotation amount detecting means 6 uses a tacho generator,
It may be configured to count rotation pulses or to detect the rotation amount from the output voltage using a potentiometer. Therefore, the load sensing unit 5 and the rotation amount detecting means 6 may share a part of the configuration as long as the rotation amount and the load can be separately detected and output.

As shown in FIG. 1, the lower limit position detecting means 7 is a detector (proximity switch) 7a provided at the lower limit position of the guide rail 1b and a detector (magnet) 7b provided on the seat plate 1a of the shutter 1. The shutter 1 is lowered and the shutter 1 is actually at the lower limit position (fully closed state).
When this is reached, this is detected and an ON state detection signal is output. The lower limit position detecting means 7 may be provided at both ends of the seat plate 1a, and may be in a fully closed state if both detection signals are received. Further, the detector constituting the lower limit position detecting means 7 may be a mechanical limit switch provided on the guide rail 1b and contacting the seat plate 1a. In addition, as a detector, a light emitting / receiving sensor may be provided on the guide rail 1b, and a reflector, which is a detection body, may be provided on the seat plate 1a to detect the presence or absence of light reflection. Further, it is also possible to provide a light projecting sensor and a light receiving sensor as detectors on both guide rails 1b to detect the seat plate 1a.

When the load sensing signal of the load sensing section 5 is turned on during opening / closing of the shutter 1, the controller 4a assumes that an obstacle is sensed and controls the shutter 1 to the safe side. For example, the shutter 2 is stopped and the shutter 1 is stopped.

Table 1 below shows the normal operation of the shutter 1 closing operation, the detection outputs of the detecting means 5, 6 and 7 when the obstacle is detected at the closing position and when the obstacle is detected near the lower limit. It shows the judgment of the controller 4a and the control output of the controller 4.

[0023]

[Table 1]

As described above, the controller 4a can detect an obstacle near the lower end of the shutter 1 without depending only on the load detection signal of the load detector 5, and the obstacle near the fully closed position of the shutter 1 can be detected. The detection can be performed accurately.

That is, as shown in FIG. 1, when an obstacle is near the lower end of the shutter 1, even if the shutter 1 is lowered, the seat plate 1a of the shutter 1 stops while hitting the obstacle. Therefore, it cannot descend to the lower limit position below this. As a result, the detector 7a remains in the OFF state. However, even when the detector 7a is turned off, the controller 4a turns on when the counter 6b is turned on because the switch 2 is continuously rotated due to the looseness between the slats of the shutter 1 and the slack. ,
The presence of obstacles can be detected.

Even when an obstacle is detected at this lower limit position, the control section 4 controls the shutter 1 to the safe side. For example, the shutter 2 is stopped or inverted and the shutter 1 is stopped or inverted and raised. As described above, at the lower limit position of the shutter 1, the obstacle detection of the shutter 1 can be performed by the detection output of the lower limit position detection means 7 and the rotation amount detection means 6 before the load detection by the load detection unit 5.

When the detector 7a is in the ON state for some reason and the counter 6b is in the OFF state, at least the shutter 1 has reached the lower limit.
In the case of “a”, it is judged to be a normal operation without judging the obstacle detection.
Obviously, if the load sensing unit 5 senses the load and turns ON before the detector 7a turns OFF and the counter 6b turns ON, an obstacle is sensed.

The processing contents of the obstacle sensing operation during the closing operation of the shutter 1 described above are shown in the flow charts of FIGS. FIG. 4 shows processing steps corresponding to the case where the detector 7a described in the obstacle sensing operation is first turned on and then the counter 6b is turned on. However, for some reason, the counter 6b is turned on first, and then the detector 7a is turned on.
It is necessary to detect an obstacle even when N is reached, and this processing step is shown in FIG.

Next, FIG. 6 is a front view showing a second embodiment of the present invention. In this embodiment, obstacle detection in the entire height direction of the opening 10 can be performed without the load sensing unit 5, and the lower limit position detecting means 7,
The configuration of the rotation amount detecting means 6 is changed.

First, as shown in FIG. 6, a shutter position detecting means 17 is provided in place of the lower limit position detecting means 7. Specifically, as shown in FIG. 1, the shutter position detecting means 17 includes a plurality of detectors (proximity switches) 17A to 1A at the upper and lower end positions of the guide rail 1b and the middle positions thereof at equal intervals.
7F, and the seat plate 1a of the shutter 1 is provided with a detection body (magnet) 7b. The position of the descending shutter 1 is detected by each of the detectors 17A to 17F, and an ON state detection signal is output when the shutter 1 passes.

FIG. 7 is a block diagram showing the control unit 14. The control unit 14 is a controller 1 including an MPU.
4a, and the elevation of the shutter 1 is controlled by the control of the controller 14a. An operation switch 3 for opening / closing and stopping the shutter 1 and an opening / closing device 2 are connected to the control unit 14. The rotation number of the switch 2 is detected by the rotation amount detecting means 16.

As the rotation amount detecting means 16, a potentiometer 16b shown in FIG. 8 is used instead of the counter.
This potentiometer 16b is used in the reduction gearbox 1
It is connected to the rotary shaft 2a of the switch 2 via 6a. The deceleration gear box 16a is rotated a plurality of times on the input side connected to the opening / closing device 2 according to the distance (opening / closing stroke) between the upper and lower limit positions of the shutter 1, and on the output side corresponding to the opening / closing stroke of the shutter 1. Then, the speed is reduced within one rotation.

Therefore, the potentiometer 16b is
It rotates in the range of one rotation corresponding to opening and closing of the shutter 1,
Voltages 0 to Vcc shown in FIG. 9 are continuously variably output according to the rotation angle. In this figure, A to F are the detectors 17A to 1 of the shutter position detecting means 17, respectively.
7F corresponds to the position where A is provided, A is the upper limit position of the shutter, and F is the position slightly above the lower limit position. As shown in the figure, the switchgear 2 has a maximum stroke to a position beyond the upper and lower limit positions in consideration of the amount of backlash and slack of the shutter 1, and the reduction gear box 16a has a maximum stroke. The stroke is set to be within one rotation.

A digital position signal corresponding to the voltage value of the potentiometer 16b is output to the controller 14a via the A / D conversion board 16c. Further, the rotation amount detecting means 16 may be configured to use an encoder instead of the potentiometer 16b, and may be configured to detect the rotation of the switch 2 by the pulse count output.
In addition, a switch 2 is used for each predetermined count value using a counter.
May be configured to perform output corresponding to the rotation of (the corresponding lowered position of the shutter 1). This rotation amount detecting means 16
The actual rotation state of the switch 2 can be obtained from the value output by the switch.

The controller 14a also obtains the opening / closing position of the shutter 1 based on the output of the shutter position detecting means 17. That is, although the detectors 17A to 17F are sequentially passed according to the opening / closing of the shutter 1, the open / closed position of the shutter 1 is determined based on the passing state. Specifically, when the detector is composed of a proximity switch, the shutter 1 is closed and the magnet 7b of the seat plate 1a is closed.
However, when the proximity switch 17 passes the position of each proximity switch 17, the proximity switch 17 outputs a detection signal of the ON state, but after passing, the controller 14a side holds the ON state in the storage unit.

After passing, the proximity switch 17 outputs a detection output of OFF, but the controller 14a indicates that the shutter 1 continues to operate until the shutter 1 continues to close and the proximity switch 17 one step below is turned ON. It is determined that the seat plate 1a is located between the upper and lower proximity switches 17, 17. Therefore, when the seat plate 1a reaches the lower limit position, all outputs of the proximity switches 17A to 17F are stored and held in the ON state. Only the proximity switch 17A is used as an upper limit switch.

On the other hand, when the opening operation of the shutter 1 is performed, the memory retention of the ON state of the passed proximity switch 17 is sequentially released. For example, the seat plate 1a is the proximity switch 1
Proximity switch 17 when ascending after passing through section 7E
The detection output of E causes the controller 14a to cancel the holding of the ON state of the proximity switch 17E after passing.
At this time, the ON outputs of the proximity switches 17A to 17D are stored and held. At the same time, controller 1
4a determines that the seat plate 1a is located between the proximity switches 17D and 17E.

If the detectors 17A to 17F use a switch (for example, a switch that mechanically holds the contacts) that holds the detection output after passing when the shutter is lowered,
A configuration for storing and holding the detection signal on the side of the controller 14a becomes unnecessary. This switch releases the hold of the detection output when it passes when rising.

Then, the controller 14a uses the shutter position detecting means 1 which indicates the actual ascending / descending state of the shutter 1.
An obstacle in the entire height direction of the opening 10 can be detected based on the output of 7 and the actual rotation state of the switch 2 output by the rotation amount detection means 16. That is, the controller 14a determines that there is an obstacle when the states shown in Table 2 below occur during the shutter 1 closing operation.

[0040]

[Table 2]

Thus, the controller 14a is
Obstacles can be detected in the entire area of the shutter opening 10. For example, as shown in FIG.
When there is an obstacle having a height corresponding to the position between C and 17D, even if the shutter 1 is lowered, the seat plate 1a of the shutter 1 stops while hitting the obstacle,
It is not possible to descend below this point. That is, it cannot be detected by the detector 17E one step below. At this time, the detector 17C outputs a detection signal in the ON state, but the switch 2 continues to rotate in the closing direction, and the rotation amount detecting means 1
The potentiometer 16b of 6 outputs a corresponding voltage value.

Then, the controller 14a outputs a voltage value (actually a corresponding digital value) corresponding to the position of the detector 17D one step lower than the output value of the rotation amount detecting means 16, that is, V ≧ VD. When it becomes, it is judged that there is an obstacle. The rotation of the opening / closing device 2 after detecting an obstacle is caused by the shutter 1
The controller 14a detects that there is an obstacle when the above conditions are satisfied at the stage before the rattling and the slack between the slats are filled, and at the stage before the looseness is reduced and before the significant slack occurs. be able to.

At the same time, the controller 14a can judge the obstacle position and the height position of the obstacle in units of the arrangement intervals of the detectors 17A to 17F constituting the shutter position detecting means 17 when the obstacle is detected. The judgment result can be stored and externally output.

When an obstacle is sensed in the opening 10 in this way, the controller 14 controls the shutter 1 to the safe side. For example, the shutter 2 is stopped by controlling the stop of the opening / closing device 2. Further, the shutter 1 may be inverted and raised when an obstacle is detected by setting the controller 14a. As described above, when the shutter 1 is hit by an obstacle, the shutter output is detected by the shutter position detecting means 17 and the rotation amount detecting means 16 before the slat rattling is reduced and a large amount of slack is generated. Since the obstacle can be sensed, the load can be sensed more quickly than the load of the switchgear 2 is sensed.

In the second embodiment, the shutter position detecting means 17 is composed of a total of six detectors 17A to 17F, but this number may be increased in the vertical direction of the guide rail 1b. In this case, the controller 14a can judge the output value of the rotation amount detecting means 16 from each of the detectors 17 having the increased number of conditions in multiple stages, so that there is less rattling or slack in the obstacle. Can be sensed, and this obstacle can be sensed more quickly.

[0046]

According to the first aspect of the present invention, the rotation amount detecting means detects the rotation amount of the opening / closing device, the lower limit position detecting means detects the lower limit position of the shutter, and the control section closes the shutter from these detection states. When the shutter does not reach the lower limit position during operation, but when the opening / closing switch reaches the lower limit position, it is determined that there is an obstacle at the lower end of the opening, and this obstacle can be detected quickly. In addition, the shutter can be stopped immediately and safely controlled while the load applied between the shutter side and the obstacle is small, and damage to each other can be prevented. In particular, obstacle detection is likely to occur at the lower end of the opening, which is effective in preventing finger scissors and the like.

According to the present invention, the rotation amount detecting means detects the rotation amount of the opening / closing device, the shutter position detecting means detects the lowered position of the shutter at predetermined intervals, and the control section detects these. When the shutter has not reached the position of each shutter position detection means during the shutter closing operation from the state, but when the opening / closing switch reaches the rotation amount corresponding to the position of the shutter position detection means, there is an obstacle at the same position. With this configuration, obstacles can be quickly detected in the entire height direction of the opening, and the shutter can be stopped immediately while the load applied between the shutter side and the obstacle is small, etc. It is possible to control and prevent damage to each other. At the same time, the control unit can detect the obstacle position and the height of the obstacle.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a shutter obstacle detection device of the present invention.

FIG. 2 is a block diagram showing a control unit of the apparatus.

FIG. 3 is a diagram showing a load sensing unit and a rotation amount detecting unit.

FIG. 4 is a flowchart showing the processing contents of an obstacle sensing operation.

FIG. 5 is a flowchart showing another processing content of the obstacle sensing operation.

FIG. 6 is a front view showing a second embodiment of the present invention.

FIG. 7 is a block diagram showing a control unit of the apparatus.

FIG. 8 is a view showing a rotation amount detecting means.

FIG. 9 is a diagram showing an output voltage of a potentiometer.

FIG. 10 is a front view showing a conventional shutter.

FIG. 11A is a diagram showing slack of a shutter.
(B) is a figure showing a reverse winding state.

[Explanation of symbols]

1 ... Shutter, 1a ... Seat plate, 1b ... Guide rail, 2
... Switch, 3 ... Operation switch, 4,14 ... Control unit, 4
a, 14a ... Controller, 5 ... Load sensing unit, 6, 16
... Rotation amount detecting means, 6b ... Counter, 16b ... Potentiometer, 7 ... Lower limit position detecting means, 17 ... Shutter position detecting means, 7a, 17A to 17F ... Detector, 7b ... Detecting body, 10 ... Opening part.

Claims (9)

[Claims] 1. A shutter (1) which is composed of a plurality of slats and which can freely move an opening (10) up and down, an opening and closing device (2) for driving the opening and closing of the shutter, and a rotation for detecting a rotating state of the opening and closing device. Quantity detection means (6)
A lower limit position detecting means (7) for detecting when the shutter reaches the lower limit position, and before the detection of the shutter reaching the lower limit position by the lower limit position detecting means when the shutter is closed. A control unit (4) that determines that there is an obstacle at the lower end of the opening when the rotation amount detection unit reaches the rotation amount corresponding to the lower limit position of the shutter, and performs safety control to stop the shutter at least. An obstacle sensing device for a shutter, comprising: 2. The rotation amount detecting means (6) is connected to a rotating shaft (2a) of the opening / closing device (2), and a detection signal is output when the opening / closing device reaches a rotation amount corresponding to a lower limit position of a shutter. The obstacle detection device for a shutter according to claim 1, wherein the obstacle detection device is configured to output the. 3. The rotation amount detecting means (6) is composed of a counter (6b) that counts according to the rotation of the switch, and a count value corresponding to the lower limit position of the shutter (1) is preset. The shutter obstacle detection device according to claim 2, wherein the detection signal is output when the set value is reached. 4. The lower limit position detecting means (7) is characterized in that a detector provided at a lower end portion of a guide rail (1b) of the shutter (1) is a seat plate (1a) at a lower end of the shutter (1).
The obstacle sensing device for a shutter according to claim 1, wherein the obstacle sensing device is configured to detect the. 5. The lower limit position detecting means (7) is characterized in that a detector provided at a lower end portion of a guide rail (1b) of the shutter (1) is a seat plate (1a) at a lower end of the shutter (1).
The obstacle detection device for a shutter according to claim 1, wherein the obstacle detection device is configured to detect a detection object provided in the. 6. The shutter according to claim 5, wherein the detector of the lower limit position detecting means (7) is composed of a proximity switch (7a) and detects the approach of the magnet (7b) as the detection body. Obstacle detection device. 7. A shutter (1) composed of a plurality of slats and capable of moving up and down an opening (10), an opening / closing device (2) for opening and closing the shutter, and a rotation for detecting a rotating state of the opening and closing device. Quantity detection means (16)
And shutter position detecting means (17) for detecting the descending position of the seat plate (1a) of the shutter at each position at predetermined intervals.
When the shutter is closed, the opening portion is provided when the rotation amount detection means reaches the rotation amount corresponding to each position of the shutter before the shutter position detection means detects that the shutter reaches each position. The control unit (1) that determines that there is an obstacle at the height position of the shutter position detection means and performs safety control to stop the shutter at least.
4) An obstacle detecting device for a shutter, comprising: 8. The rotation amount detecting means (16) is connected to a rotating shaft of the opening / closing device (2) and reduces the rotation of the opening / closing device within one rotation corresponding to an opening / closing stroke of the shutter (1). Deceleration gear box (16a) and a potentiometer (16b) connected to the gear box for outputting a position signal corresponding to the opening / closing position of the shutter
8. The obstacle detection device for a shutter according to claim 7, wherein the obstacle detection device is a shutter. 9. The shutter position detecting means (17)
Is a plurality of detectors (1) provided at predetermined intervals in the height direction along the guide rail (1b) of the shutter (1).
7A to 17F) and a detector (7b) provided on the seat plate (1a) of the shutter, and outputs a detection signal when the seat plate passes each detector part. 7. The shutter obstacle detection device according to 7.