JPH0635790B2 - Safety control device in shutter - Google Patents

Description

The present invention automatically controls the lowering operation of a shutter by using a non-contact detection path including a photoelectric sensor or the like that detects the presence or absence of an obstacle at a position below the seat plate at the lower end of the shutter. Related to the safety control device for the shutter,
When an obstacle is detected, it can be detected regardless of the size and shape of the obstacle by lowering the shutter while always holding the obstacle detection standby state in the entire opening and closing area of the shutter. Before the seat plate provided at the lower end of the shutter contacts the obstacle, the lowering operation of the shutter is stopped, and for the removal of the obstacle, the shutter is lowered again from the stop position after a predetermined time has passed,
The present invention relates to a safety control device for a shutter, which is capable of safely and surely performing the lowering operation of the shutter while eliminating unnecessary steps for the lowering operation of the shutter.

Conventionally, a safety stop mechanism that interlocks a contact switch provided on a seat plate to stop the descending operation when an obstacle is present during the descending operation when the shutter is moved up and down. However, this one is such that when the contact switch provided on the seat plate of the shutter comes into contact with an obstacle and the shutter stops midway, the lifting drive mechanism is
In addition to the safety stop mechanism, the repeated lifting mechanism that repeatedly lifts and lowers the shutter until the obstacle is removed is linked to perform safety control, which complicates the structure of the safety control device. Repeated lifting and lowering of the shutter until the obstacle is removed puts a significant load on the lifting drive mechanism, impairing the durability of the lifting drive mechanism and damaging the contact switch because the contact switch repeatedly contacts the obstacle. Therefore, among obstacles, especially in the case of a dynamic obstacle such as a human being, there is a drawback that the function as the safety control is impaired and an unexpected personal injury is caused. In the case of a static obstacle, a repeated lifting mechanism that repeatedly moves up and down until the obstacle is removed was completely unnecessary in the case of a dynamic obstacle.

The present invention was devised in order to eliminate these drawbacks in view of the above situation, and its purpose is to provide a lowering control mechanism for controlling the lowering operation of the shutter opening / closing drive, By interlockingly connecting with a non-contact type detection switch mechanism that detects the presence of obstacles below the seat plate at the bottom of the shutter, the standby state for obstacle detection is always maintained in the entire opening and closing area of the shutter, The shutter is stopped when the detection switch mechanism detects an obstacle, and the shutter is lowered again from the stop position after a predetermined time has passed after the obstacle is removed. The repeated lifting mechanism has been omitted to simplify the entire system, and in case of obstacles such as human beings, accidental personal injury is prevented and static like an object is prevented. A safety control device for a shutter that allows the obstacle to be removed with time in a timely manner, and thus allows the shutter to descend and move safely and reliably without the need to repeatedly move the shutter up and down by detecting the obstacle. To provide.

The structure of the present invention will be described based on an embodiment shown in the drawings. 1 is a shutter provided in an opening, and the shutter 1 is guided by left and right guide rails 2 to open and close. To do. Reference numeral 3 denotes an opening / closing drive device for the shutter 1. The shutter 1 is wound and rewound by the forward / reverse driving of the opening / closing drive device 3.

Reference numeral 4 denotes a photoelectric sensor provided on one side of the shutter case 5, and 6 and 6a are provided on both sides of the seat plate 7 at the lower end of the shutter 1 so as to face each other so as to project below the seat plate 7. The photoelectric sensor 4 has a detection optical path formed by projecting and receiving light between a reflecting plate 6 inclined at 45 degrees and another vertical reflecting plate 6a. The photoelectric sensor 4 performs a detection operation described later by blocking an obstacle between the two reflection plates 6 and 6a, and the non-contact detection switch mechanism 8 is operated by these.
Is configured. The reflectors 6 and 6a are rotatably supported by the shaft 9, but the reflector 6 is always inclined by 45 degrees due to the balance with the weight body 10 integrated with the reflector 6. The reflection plate 6a is vertical due to its own weight. Then, when the shutter 1 descends and the seat plate 7 approaches the floor surface, the arc-shaped guide portions 11, 11a provided at the lower ends of the reflector plates 6, 6a abut the floor surface and the reflector plates 6, 6a. The seat plate 7 can be landed by rotating the seat plate 7 around the shaft 9.

FIG. 3 shows a block diagram of the opening / closing operation circuit of the shutter 1. In FIG. 3, 12 is a delay timer 13 connected to the photoelectric switch mechanism 8 and an alarm timer 15 connected to the alarm device 14. A built-in timer circuit mechanism, 16 is a lift control circuit mechanism for operating the opening / closing driver 3 in the forward and reverse directions by an input signal from the lift switch 17, and 18 is a limit for detecting the upper and lower limits of the shutter 1 and stopping the lifting operation of the shutter 1. It is a switch circuit mechanism. In the present invention, since the lowering operation of the shutter 1 is particularly characteristic,
FIG. 4 further shows a circuit diagram of the descending operation circuit mechanism A.
That is, the lower side relay switch 20, the alarm timer 15, the photoelectric sensor 4, the delay timer 15 and the alarm device 14 of the lifting control circuit mechanism 16 are connected in parallel to the power supply circuits 19 and 19a from the power supply EP, and further the relay switch circuit. 20a and the alarm timer circuit 16a are electrically connected 21 on the power supply circuit 19 side. The switch contact 20s of the relay switch 20 is provided on the power supply circuit 19 side of the conduction 21 position of the relay switch circuit 20a and on the power supply circuit 3a of the opening / closing driver 3, respectively.

On the other hand, the switch contact 4s of the photoelectric sensor 4 is connected to the delay timer circuit 13, the switch contact 13s of the delay timer circuit 13 is connected to the power supply circuit 19a side of the relay switch circuit 20a, and the switch contact 15s of the alarm timer 15 is connected to the alarm circuit 14a. Like the switch contact 20s, it is provided in the normally open state.

Further, in the alarm timer circuit 15a, the switch contact 17s for the lowering operation of the elevating switch 17 is always closed on the side of the power supply circuit 19 on the side of the conduction 21 position, and the limit switch circuit mechanism 18 is on the side of the power supply circuit 19a. The lowermost switch contact 18s is always provided in a closed state. In the figure, 22 and 23 are stop switches and emergency stop switches provided in the power supply circuit 19, and 24 is a control panel incorporating the above-mentioned circuit mechanisms. Also, the set time T ₁ of the delay timer 13 is a few seconds, and the set time T ₂ of the alarm timer 15 is the shutter 1
It is the time obtained by adding a predetermined time to the falling time of.

Next, the operation of the present invention configured as described above will be described. In order to raise the closed shutter 1, the raising side of the raising / lowering switch 17 is turned on, and the raising side circuit of the raising / lowering control circuit mechanism operates to rotate and drive the opening / closing driver 3. To do. The limit switch circuit mechanism 18 stops the opening / closing driver when the upper limit of the shutter 1 is detected, and the opening operation of the shutter 1 is completed, which is the same as in the prior art.

On the other hand, when the opened / closed shutter 1 is lowered and closed, the photoelectric sensor 4 is actuated when the power EP of the lower operation circuit mechanism A is turned on, and the switch contact 4s is closed. This causes the delay timer 13 to conduct for a few seconds (eg 2 seconds).
After a lapse of time, the switch contact 13s is closed and the circuit mechanism A is in an operating state. Then, when the descending side of the elevating switch 17 (for example, provided at a distance where the shutter 1 cannot be seen through) is turned on, the relay switch 20 and the alarm timer 15 are input. As a result, all the switch contacts 20a of the relay switch 20 are closed (three places in this embodiment), the opening / closing driver 3 is driven downward to lower the shutter 1, and at the same time, input from the relay switch circuit 20 side in the future. Will be done. Then, the shutter 1 descends, and the limit switch circuit mechanism 18 causes the shutter 1
When the switch reaches the lower limit, the switch contact 18s is opened, the photoelectric sensor 4 detects it, and the inputs to the relay switch 20 and the alarm timer 15 are cut off, the switch contact 20s is opened, and the driving of the opening / closing driver 3 is stopped. The closing operation of the shutter 1 ends.

When there is an obstacle during the lowering operation of the shutter 1 like this,
The obstacle blocks the light projection and reception between the reflectors 6 and 6a. This is detected by the photoelectric sensor 4, the switch contact 4s is opened, and the input of the delay timer circuit 13a is cut off. As a result, the switch contact 13s is opened, the input to the relay switch 20 is cut off, and the driving of the opening / closing driver 3 is stopped. Therefore,
In the descending stop of the shutter 1 in the present embodiment by detecting an obstacle, when an obstacle is detected, it stops at the upper position before the seat plate 7 comes into contact with the obstacle, so the obstacle is appropriately located between the seat plate 7 and the seat plate 7. Since the gap is provided, the obstacle can be promptly removed without raising the shutter 1. After the obstacle is removed, when the light projecting and receiving between the reflectors 6 and 6a is restarted, the switch contact 4a of the photoelectric sensor 4
Is closed and input to the delay timer 13, and after the lapse of the set time T ₁ , the shutter 1 resumes lowering from the position stopped by the obstacle detection.

Here, since the photoelectric sensor 4 is not returned and the descent is not resumed immediately after the obstacle is removed, a human being, for example, a dynamic obstacle forcibly tries to pass through the lower side of the shutter 1 when the shutter 1 descends. At this time, if the photoelectric sensor 4 is detected and stopped to descend, the human being as an obstacle can pass through immediately without contacting the lower surface of the seat plate 7, and in the case of an object as a static obstacle, It is possible to allow a safe restart of the descent by allowing time for removal.

On the other hand, the alarm timer 15 starts to operate when the lift switch 17 is turned on, but when the obstacle is not removed and the set time T _{2 of the} timer 15 elapses, the switch contact 15s
Is closed and an alarm is issued from the alarm device 14, which suggests the removal of obstacles around. This means that in the detection of an object that is a static obstacle, unless the static obstacle is removed, the obstacle detection will continue, and by issuing an alarm only when a static obstacle is present, It was designed to prevent mischief from annoying others. In this embodiment, the alarm device is shown as a means for notifying the presence of the obstacle, but the present invention is not limited to this, and a light emitting device such as a blinking lamp may be used instead of the alarm device.

As described above, in this embodiment, when the shutter 1 detects an obstacle, the shutter 1 holds the stopped state as it is, and therefore the structure is simplified without moving the shutter 1 back and forth to remove the obstacle. In addition to the fact that the seat plate does not come into contact with the obstacle and damage the obstacle each time the shutter 1 is repeatedly moved up and down, it is useless for the drive motor that is driven in conjunction with the repeated movement up and down. Since no load is applied, there is no fear of failure of the opening / closing drive, and the shutter can be opened and closed smoothly and reliably at all times.

In the present embodiment, the alarm timer 15 sets the start of the lowering operation of the shutter 1 as the reference time of the set time T ₂ .
As shown in FIG. 6, the relay switch circuit 20a and the alarm timer circuit 15a are independent of each other, and the alarm timer circuit 15a is provided with the switch contact 4s' of the photoelectric sensor 4 which is normally closed. If the photoelectric sensor 4 is opened and an obstacle is detected by the photoelectric sensor 4, the alarm timer 15 is closed and an alarm is generated based on the time when the shutter 1 is stopped by the obstacle detection. You can

In short, the present invention is an electric shutter configured to open and close the opening of a building by moving the shutter curtain up and down by the forward and reverse rotation drive of the opening and closing drive machine, and a seat provided at the lowermost end of the shutter curtain. In the lower area of the plate, in order to form a non-contact detection path such as a photoelectric sensor that is blocked by obstacle detection, a pair of detection path forming members are provided on the seat plate so as to face downward, The drive of the opening / closing drive that is linked to the blocking of the detection path is stopped, and the lowering of the shutter is stopped before the seat plate touches the obstacle, and the opening and closing drive is performed after a predetermined time has elapsed from the restoration of the detection path linked to the removal of the obstacle. Since the machine is re-driven and the shutter is lowered again from the stop position, the shutter itself is lowered in the entire opening / closing area of the shutter without any external stopping force. Immediately it is possible to stop the shutter abuts at previously obstacle upon detection of a,
While removing damage to both the shutter and the obstacle, the obstacle can be easily removed with a proper gap between the shutter and the seat plate of the stopped shutter.
After the obstacle is removed, the shutter can be lowered again from the position stopped by the obstacle detection after a lapse of a predetermined time after the non-contact detection path is restored. There is no risk of damaging the contact switch by repeatedly raising and lowering the shutter, simplifying the overall configuration, and avoiding unnecessary load on the drive motor of the shutter opening / closing drive mechanism linked to the repeated raising and lowering. The durability of the mechanism can be improved, in particular, accidents resulting in accidents resulting in injury or death can be prevented in advance for dynamic obstacles such as humans, and obstacles can be prevented for objects that are static obstacles. There is a very useful new effect that the shutter can be safely lowered in a reliable manner by allowing time for removing the object.

[Brief description of drawings]

The drawings show one embodiment of a safety control device for a shutter according to the present invention. FIG. 1 is an overall front view of the shutter, FIG. 2 is a front view of a lower portion of the shutter, and FIG. FIG. 4 is a block diagram of an opening / closing actuation circuit, FIG. 4 is a descending actuation circuit diagram, FIG. 5 is an operation explanatory diagram, and FIG. 6 is a descending actuation circuit diagram showing another embodiment. In the figure, 1 is a shutter, 2 is a guide rail, 3 is an opening / closing driver, 4 is a non-contact detection sensor, 5 is a shutter case, 6 and 6a are reflectors, 7 is a seat plate, 8 is a photoelectric switch mechanism, and 9 is a photoelectric switch mechanism. Is a shaft, 10 is a weight, 11 and 11a are guides, 12 is a timer circuit mechanism, 15 is an alarm timer, 16 is a lifting control circuit mechanism, 17 is a lifting switch, 18 is a limit switch circuit mechanism, and 19 and 19a are power supplies. A circuit, 20 is a relay switch, 21 is a conduction circuit, 22 is a stop switch, and 23 is an emergency stop switch.

Claims (1)

[Claims] 1. An electric shutter configured to open and close a shutter curtain by opening and closing a shutter opening and closing by opening and closing a shutter curtain by forward and reverse rotation of an opening-and-closing drive, and below a seat plate provided at the lowermost end of the shutter curtain. In the area, in order to form a non-contact detection path such as a photoelectric sensor that is blocked by obstacle detection, a pair of detection path forming members are provided on the seat plate so as to face downward and the detection path of the detection path is formed. When the drive of the opening / closing drive that is linked to the shutoff is stopped, the lowering of the shutter is stopped before the seat plate abuts the obstacle, and the opening / closing drive is restarted after a predetermined time has elapsed from the restoration of the detection path linked to the removal of the obstacle. A safety control device for a shutter, wherein the safety control device is configured to be driven and to re-lower the shutter from the stop position.