JPH0633674A - Safety device for electric shutter - Google Patents

Abstract

(57) [Summary] [Purpose] When the seat plate provided at the lower end of the shutter curtain hits an obstacle at the moment, the presence of the obstacle is reliably detected and the shutter is stopped or reversed and opened at the same time. The load of the seat plate is only received, and the load of the shutter curtain and the torque of the motor for unwinding the shutter curtain are not received to prevent damage to obstacles. [Structure] A tip of a line 5 wound around a self-winding reel 4 is connected to a side end of a movable seat plate 2 provided at a lower end of a shutter curtain 1 so as to be vertically movable, and the movable seat plate 2 is an obstacle. The shutter is stopped or reversely opened when the unwinding speed of the line 5 unwound from the reel 4 by contacting the.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for an electric shutter which causes an emergency stop of the drive of the shutter when the descending shutter curtain hits an obstacle, and a reverse movement of the shutter curtain.

[0002]

2. Description of the Related Art An electric shutter for automatically moving a shutter curtain up and down by a motor drive outputs a shutter drive stop signal and a reverse opening signal when it detects that the shutter curtain being descended hits an obstacle. Safety devices are provided. This type of safety device is provided with a tape-shaped pressure sensitive switch along the bottom surface of the seat plate forming the lower end of the shutter curtain, and converts the switch signal output when the pressure sensitive switch hits an obstacle into a wireless signal. A method of transmitting the data to a controller for driving the shutter is predominant (Japanese Utility Model Publication No. 54-7908), but a dry battery is used as a power source for a pressure sensitive switch provided on an elevating member such as a shutter curtain and a wireless device. Since there is nothing else to do, there is the inconvenience that regular inspections for battery replacement are indispensable, and the cost is high because expensive wireless devices are also required.

For this reason, a tape-shaped pressure sensitive switch is laid in a groove formed along the floor surface of the shutter line for receiving the seat plate of the shutter, and the pressure sensitive switch is turned on when an obstacle is placed on the floor surface. Then, the drive of the shutter is stopped (Japanese Patent Laid-Open No. 62-55391), or a tape-shaped pressure sensitive switch is attached vertically along the guide rail of the shutter and the lower end of the shutter curtain. Attempts have also been made to eliminate the need for dry batteries and wireless devices by using a lever structure that has a point of action of the seat plate provided on the table and is moved by pressing it against an obstacle and a point of action that presses the pressure sensitive switch in the guide rail with that force. However, the work of forming a concave groove on the floor surface and laying the pressure sensitive switch in the groove is very troublesome, and if the pressure sensitive switch is pasted in the guide rail, Not only the installation work is troublesome, but also the relation structure between the seat plate and the guide rail must be strictly designed according to the type of shutter so that the pressure-sensitive switch can be reliably pressed by the lever-structured seat plate. There is. In addition, a safety device using a tape-shaped pressure-sensitive switch must be processed so that the length of the pressure-sensitive switch is adjusted to the opening width and opening height of the shutter. Furthermore, the safety device that operates the pressure sensitive switch by the pressure when the seat plate of the shutter presses against the obstacle, because the obstacle receives the weight of the shutter curtain and the torque of the motor that lowers the shutter curtain,
There is a great risk of damaging people and obstacles such as debris.

As another safety device, there is one in which an optical axis of a phototube is formed between the left and right guide rails and a shutter drive stop signal or the like is output when the optical axis is blocked by an obstacle. However, in this case, it is necessary to perform processing to mount the light emitter / receiver in the guide rail and troublesome adjustment of the optical axis.Because the obstacle detection area is limited only to the optical axis, it may depend on the shape of the obstacle. There was a possibility that an undetectable situation could occur.

[0005]

Therefore, the present invention can reliably detect the presence of an obstacle without damaging the obstacle, and at the same time, depending on the type of the shutter, the opening width, and the difference in the opening height. There is no need to change the size and structure of the safety device, and it can be used for any shutter as it is.Also, without using consumable items such as dry batteries, the trouble of maintenance and inspection is eliminated, and the trouble of processing is eliminated. The technical issue is to reduce the price of safety devices.

[0006]

In order to solve this problem, a safety device for an electric shutter according to the present invention is provided with a rewind mechanism or the like, which winds along a side end portion of a shutter curtain from a reel that is freely biased. The tip of the line that can be unrolled downward is connected to the side end of a movable seat plate that is vertically movable at the lower end of the shutter curtain.
A pulse generator that outputs a pulse according to the unwinding speed of the line that is unwound from the reel in response to the descent of the shutter curtain, a counter that counts the number of pulses output from the pulse generator, and a count of the counter. And a controller that calculates the unwinding speed of the line based on the result and, at the same time, outputs a shutter drive stop signal or a reverse opening signal when the unwinding speed drops below a certain value during the shutter closing operation. It is characterized by

[0007]

According to the present invention, when the movable seat plate provided at the lower end of the shutter curtain slightly contacts an obstacle during the closing operation of the shutter for lowering the shutter curtain, the side end portion of the movable seat plate is instantaneously reached. The unwinding speed of the line that was unwound from the reel in connection with the controller drops below a certain value, and the controller outputs a shutter stop signal or a reverse opening signal to prevent damage to obstacles. It In particular, in the present invention, since the seat plate provided at the lower end of the shutter curtain is a movable seat plate that can move up and down,
Since the impact load applied at the moment when the seat plate hits the obstacle is very small, the risk of damaging the obstacle is extremely small.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall view showing a schematic configuration of a safety device according to the present invention, FIG. 2 is a perspective view showing a relational structure between a reel that unwinds a line and a pulse generator, FIG. 3 is a front view of the pulse generator, and FIG. 4 is a movable seat plate. And a line connected to the side end portion thereof, and FIGS. 5 to 7 are views showing other examples of the pulse generator.

In FIG. 1, 1 is a shutter curtain having a movable seat plate 2 at its lower end, 3 is a shutter case for accommodating the shutter curtain 1, and inside the shutter case 3 is a rewind mechanism similar to a tape measure. The reels 4 and 4 which are biased in a self-winding manner are provided on both left and right sides of the shutter curtain 1 with the shutter curtain 1 interposed therebetween. A line 5 made of an elongated cloth or a tape of a strip steel is wound around each reel 4, and the tip of the line 5 is connected to the left and right side end portions of the movable seat plate 2.

Each reel 4 has a shaft 7 in a casing 6 provided on the inner wall of the shutter case 3 as shown in FIG.
It is rotatably supported and accommodated by the coil spring 8 and is biased by a spiral spring 8 as shown in FIG. In the shutter case 3, as shown in FIGS. 2 and 3,
Photoelectric converter 11 mounted on the side surface of each reel 4 and opposed to a gear-shaped disc 10 that rotates integrally with each reel 4.
A photoelectric pulse generator 9 for pulsing the intermittent light is provided, and a pulse corresponding to the unwinding speed of the line 5 unwound from the reel 4 in response to the lowering of the shutter curtain 1 is output from the pulse generator 9. It is supposed to be done. Further, 12 is a counter that counts the number of pulses output from the pulse generator 9, 13 is the unwinding speed of the line 5 calculated at the same time as the unwinding speed of the line 5 is calculated based on the counting result of the counter 12. It is judged whether the speed is below a certain value during the closing operation of the shutter, and when it is judged that the speed has dropped below the certain value, the switch 1
4 is a controller that outputs a drive stop signal or a reverse opening signal of the shutter.

Next, the movable seat plate 2 is, as shown in FIG.
A fixing member 15 fixed to the lower end of the shutter curtain 1.
And a movable member 16 which is suspended vertically with respect to the fixed member 15, and the protrusions 1 are provided at the left and right ends of the movable member 16.
7 is projected. The tip of the line 5 that is unwound from each reel 4 and passed through the guide rails 18 that guide the left and right ends of the shutter curtain 1 has the movable seat plate 2
Is connected in the guide rail 18 to the projecting piece 17 projecting to the side end of the.

However, when the movable seat plate 2 provided at the lower end of the shutter curtain 1 comes into contact with an obstacle during the closing operation of the shutter for activating the opening / closing device 14 to lower the shutter curtain 1, at that moment, The unwinding speed of the line 5 unwound from the reel 4 connected to the projecting piece 17 of the movable seat plate 2 suddenly decreases or stops, and the controller 13 sends a shutter drive stop signal to the opening / closing device 14. Alternatively, since the reverse opening signal is output, the obstacle may receive the load of the movable seat plate 2 but the load of the shutter curtain 1 and the torque of the motor of the switch 14 that lowers the shutter curtain 1. There is no. Therefore, damage to obstacles can be prevented and safety is extremely high.

Incidentally, in the above embodiment, the photoelectric converter 11 opposed to the gear-shaped disc 10 rotating integrally with the reel 4.
Although a pulse corresponding to the unwinding speed of the line 5 is output by the photoelectric pulse generator 9 that pulse-intermits the light with, a slit disk may be used instead of the gear-shaped disk 10. . Further, the member that rotates integrally with the reel 4 is not limited to a disk and may have the form of a rotary shaft, and a reflection mark such as an aluminum foil is attached to the disk or the rotary shaft to attach a photoelectric converter. It is also possible to use a reflection type photoelectric pulse generator that changes the reflected light into pulses. Further, the pulse generator 9 is not limited to the photoelectric type, for example,
An electromagnetic type having an AC generator structure in which an electromagnetic pickup is opposed to a gear-shaped concavo-convex body that rotates integrally with the reel 4, or a disc 19 that rotates integrally with the reel 4 as shown in FIG.
It may be a magnetoelectric type in which a Hall element (magnetoresistive element) 21 is arranged so as to face the magnet 20 attached to the.

Further, as shown in FIG. 6, the line 5 is formed of a metal perforated tape in which holes 22 are formed at a constant pitch along the longitudinal direction, and the line 5 is formed at a position where the holes 22 of the perforated tape pass. A photoelectric pulse generator for pulsing intermittent light with the opto-electric converters 11 facing each other, or a metal tape on which the lines 5 are printed with the bar codes 23 at equal pitches along the longitudinal direction as shown in FIG. The photoelectric pulse generator may be a photoelectric pulse generator that pulse-forms the light reflected from the black and white pattern of the barcode 23 by the photoelectric converter 24.
It should be noted that the line 5 may be a string, a wire, or the like, except for the case of FIGS. 6 and 7.

[0015]

According to the present invention, at the moment when the seat plate provided at the lower end of the shutter curtain comes into contact with the obstacle, the shutter is stopped or reversing opened, and the obstacle with which the seat plate comes into contact is prevented. Only the load of the seat plate is received, not the load of the shutter curtain or the torque of the motor.
The presence of obstacles can be reliably detected,
It has a very excellent effect of preventing damage to obstacles. In addition, the safety device of the present invention has no need for processing depending on the type of shutter, the opening width, and the difference in opening height, has general versatility that can be used for any shutter as it is, and performs battery replacement and the like. There are various excellent effects that there is no trouble of maintenance and inspection.

[Brief description of drawings]

FIG. 1 is an overall view showing a schematic configuration of a safety device for an electric shutter according to the present invention.

FIG. 2 is a perspective view showing a relational structure between a reel that unwinds a line and a pulse generator.

FIG. 3 is a front view showing an example of a pulse generator.

FIG. 4 is a perspective view showing a movable seat plate and a line connected to a side end portion thereof.

FIG. 5 is a diagram showing a modification of the pulse generator.

FIG. 6 is a diagram showing a modification of the pulse generator.

FIG. 7 is a diagram showing a modification of the pulse generator.

[Explanation of symbols]

 1 ... Shutter curtain 2 ... Movable seat plate 4 ... Reel 5 ... Line 9 ... Pulse generator 10 ... Gear disk 11 ... Photoelectric converter 12 ... Counter 13・ ・ ・ Controller 19 ・ ・ ・ Disc 20 ・ ・ ・ Magnet 21 ・ ・ ・ Magnetoresistive element 22 ・ ・ ・ Hole 23 ・ ・ ・ Bar code 24 ・ ・ ・ Photoelectric converter

Claims (8)

[Claims] 1. The lower end of the shutter curtain (1) is the tip of a line (5) that can be unrolled downward along the side end of the shutter curtain (1) from a reel (4) that is freely biased. Movable seat plate (2) installed vertically
A pulse generator (9) which is coupled to the side end of the reel and outputs a pulse corresponding to the unwinding speed of the line (5) unwound from the reel (4) in response to the descent of the shutter curtain (1). ) And a counter (1 that counts the number of pulses output from the pulse generator (9).
2) and the unwinding speed of the line (5) is calculated based on the counting result of the counter (12), and at the same time, when the unwinding speed falls below a certain value during the closing operation of the shutter, the shutter is driven. A safety device for an electric shutter, comprising: a controller (13) that outputs a stop signal or a reverse opening signal. 2. The pulse generator (9) interrupts light with a photoelectric converter (11) facing a gear disk (10) or a slit disk that rotates integrally with the reel (4). The safety device for an electric shutter according to claim 1, wherein the safety device is a photoelectric pulse generator that is pulsed. 3. A reflection type in which the pulse generator (9) attaches a reflection mark to a disc or a rotation shaft that rotates integrally with the reel (4), and changes the reflected light into pulses by a photoelectric converter. The electric shutter safety device according to claim 1, which is a photoelectric pulse generator. 4. The electromagnetic pulse generator in which the pulse generator (9) has an alternating current generator structure in which an electromagnetic pickup is opposed to a gear-shaped concavo-convex body that rotates integrally with the reel (4). Safety device for the electric shutter described. 5. The magnetoresistive element (21) is arranged so that the pulse generator (9) faces a magnet (20) attached to a disk (19) that rotates integrally with the reel (4). The safety device for an electric shutter according to claim 1, wherein the safety device is a magnetoelectric pulse generator. 6. The line (5) is a metal perforated tape in which holes (22) are punched at a constant pitch along the longitudinal direction, and the pulse generator (9) is a hole in the perforated tape. 2. The safety device for an electric shutter according to claim 1, wherein the photoelectric shutter is a photoelectric pulse generator in which a photoelectric converter (11) facing a position where the (22) passes is pulsed for intermittent light. 7. The line (5) is made of a metal tape on which bar codes (23) are printed at equal pitches along the longitudinal direction thereof, and the pulse generator (9) is a photoelectric converter (24). 2. The safety device for an electric shutter according to claim 1, wherein the safety device is a photoelectric pulse generator for pulsing light reflected from the black-and-white pattern of the barcode (23). 8. A safety device for an electric shutter according to claim 1, wherein the line (5) is made of a string, a wire or a tape.