JPH0616137Y2 - Safety device for electric shutter - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a safety device for an electric shutter installed in an opening of a building or the like.

[Problems to be Solved by Prior Art and Invention] Generally, in some electric shutters of this type, if an obstacle is encountered when the shutter curtain descends, it is detected and the further descent of the shutter curtain is stopped. Some of them have safety devices that are designed to prevent them, but if the shutter curtain is stopped at the obstacle detection position,
The obstacle remains in a state of being sandwiched between the floor and the shutter seat plate, which poses a problem that it may not be able to be evacuated or removed quickly.

Therefore, as shown in Japanese Patent Publication No. 54-25745, it has been proposed that the shutter curtain is repeatedly moved up and down until the obstacle is no longer detected. In this case, the obstacle is stationary like a luggage. If it is a thing, the shutter curtain will continue to move up and down until the obstacle is removed, and it is not allowed to waste useless power,
There is an inconvenience such as burning the electric motor due to long-time driving.

On the other hand, as shown in Japanese Utility Model Publication No. 56-38157, when an obstacle is detected, the shutter curtain is repeatedly moved up and down for a predetermined timer time, and thereafter the elevator is stopped. However, in this one, the timer time is set to be several times as long as the shutter curtain is raised and retracted based on the detection of an obstacle.

By the way, in a building shutter, the weight of the shutter curtain portion fed from the winding drum always acts as a load, and as a result, when the shutter curtain is wound up, the load is the driving force of the switchgear. The load acts on the other hand, while on the other hand, the load acts in such a state that the load promotes the driving force of the switch. As a result, the fall time is shorter than the rise time and the fall time of the same amount of shutter curtain, which is never constant.

Moreover, the winding diameter of the winding drum is large when it is close to full opening, and small when it is close to being fully closed. The load due to the weight of the shutter curtain portion fed from the winding drum always changes depending on the curtain feed amount. The time required to re-lower the curtain portion is not constant because it varies in a complicated manner depending on the delivery state of the shutter curtain. Therefore, when the shutter curtain that repeatedly moves up and down when an obstacle is detected is stopped after the timer time has elapsed, depending on the open / closed state, the shutter curtain will stop in contact with the obstacle. There is a risk that it becomes a problem.

[Means for Solving the Problem] The present invention was devised in view of the above circumstances to provide a safety device for an electric shutter capable of eliminating these drawbacks. In an electric shutter in which the shutter curtain is vertically moved up and down by driving to automatically open and close the opening, the elevator curtain control circuit mechanism for the shutter curtain receives a detection command from the obstacle detection switch. Stop the descent of the shutter curtain, then output the control command to reverse the descent and raise the descent of the shutter curtain, and then output the control command, and the number of times the descent up and down of the shutter curtain is counted. A counting control circuit that outputs a stop signal to stop the shutter curtain at the raised position when the set number of times is reached. Is provided.

According to the present invention, the stop curtain after repeating the raising and lowering of the shutter curtain based on the obstacle detection is set not the time but the number of times so that the shutter curtain stop position is always separated from the obstacle. It was done like this.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a shutter curtain of an electric shutter, which is guided by guide rails 2 standing on both sides of a building opening to move up and down to open and close. Three
Is a case of a shutter, and 4 is an electric motor of a switch. Reference numeral 5 denotes a seat plate connected to the lowermost end of the shutter curtain 1. The seat plate 5 has an obstacle detection switch 6 and a battery built-in type which is connected to the obstacle detection switch 6 and transmits a radio signal. A transmitter 7 is installed. Here, the obstacle detecting switch 6 is adapted to detect any portion of the lower end surface of the seat plate 5 contacted by the obstacle.

On the other hand, a receiver 8 for receiving the radio signal from the transmitter 7.
Is provided on the shutter case 3 side, but this receiver 8
Is a receiving circuit 9, an inverting operation circuit 10, a counting control circuit 1
1, and is connected to a lift control circuit mechanism having a lift control circuit 12 and the like as described later. And push button switch 1
If the closing switch PBD out of 3 (there are PBU for opening, PBD for closing, and PBS for stopping) switches are operated and a downward command is issued from the reversing operation circuit 10 to the elevation control circuit 12, the shutter curtain 1 However, if there is an obstacle during this descent, the obstacle detection switch 6 detects this and a signal is sent from the transmitter 7 and the receiver 8
When the signal is received, the signal reaches the reversing operation circuit 10 via the receiving circuit 9, where a stop signal is first issued to stop the descent of the shutter curtain 1 in an emergency. Next, an ascending signal is sent to the ascending / descending control circuit 12, and the shutter curtain 1 ascends and stops when it rises to a predetermined position (upper limit position in this embodiment), and this time a descending signal is issued and descends. .

On the other hand, the counting control circuit 11 is preset with the number of times the shutter curtain 1 is turned up and down. When the number of reversing up and down movements of the shutter curtain 1 reaches this set number due to the presence of the obstacle, the counting control circuit 11 issues a stop signal to the reversing operation circuit 10, so that the switch 4 is stopped. It has become. Here, in this embodiment, the count of the number of reversing up-and-down movements is limited to the lower limit limit switch (LSD) or the stop button (PB) of the push button switch 13.
When the lowering of the shutter curtain 1 is stopped in S), the shutter curtain 1 is reset. Therefore, the reset state is always maintained during normal operation.

In the embodiment of the present invention constructed as described above, when the lowering switch PBD of the push button switches 13 is pushed to close the shutter, the shutter curtain 1 starts to lower. And, as mentioned above,
If an obstacle is present while the shutter is descending, the obstacle detection switch 6 installed on the seat plate 5 detects the obstacle and a wireless signal is emitted from the transmitter 7. This signal is received by the receiver 8,
The reversing operation circuit 10 is transmitted to the reversing operation circuit 10 via the receiving circuit 9, and the reversing operation circuit 10 having received the detection signal immediately outputs a stop signal to cause the shutter curtain 1 to make an emergency stop, and thereafter, the riser signal raises the shutter curtain. To start. Then, the shutter curtain rises to the upper limit fully open position, stops by the upper limit limit switch LSU, and descends again by the lowering command. If the obstacle remains unremoved during this descent, the obstacle detection switch 6 operates again, and in this way, the shutter curtain 1 repeats the vertical reversing operation. Assuming now that the number of set reversals up and down in the counting control circuit 11 is two, the shutter curtain 1 stops at the rising position by the stop signal from the counting control circuit 11 after the two reversals of up and down. To do. Then, after removing the obstacle, the pusher switch 13 for lowering is pushed again, so that the shutter curtain 1 is lowered.

As described above, according to the present invention, the shutter curtain 1 is repeatedly moved up and down while obstacles are detected. However, when this is repeated a predetermined number of times, the shutter curtain 1 is stopped in an ascended state. There is no need to waste electric power, as the electric motor 4 of the opening / closing machine is not burned like in the case where the lifting / lowering is repeated until the obstacle is removed.

In addition, in this case, regardless of the opening height of the opening and the size of the obstacle, after repeating the set number of times (twice in the embodiment), the vehicle always stops at the ascending position. It is possible to reliably avoid that the stop position changes depending on the height of the obstacle and the open / close state of the shutter curtain, and stops the vehicle in contact with the obstacle. , The safety is greatly improved.

In addition, it is not necessary to set the timer time on-site to correspond to the frontage height, and the number of reversing up / down movements is constant regardless of changes in the height of obstacles. It is easy to estimate the accumulated consumption of the battery based on it, and assuming that there is an obstacle detection once a day, for example, the battery life can be predicted with certainty, and the battery replacement deadline can be set. It is easy and reliable maintenance management can be performed reliably.

Moreover, even if the heights of obstacles are different, the stop position of the shutter curtain 1 is always the upper limit position.
There is no guarantee that the vehicle will stop when it comes in contact with an obstacle, and there is no risk that the obstacle will be caught in the shutter. is there.

[Advantages] In short, since the present invention is configured as described above, if an obstacle is encountered during the descent of the shutter curtain, the shutter curtain will repeatedly invert up and down. When it is repeated a number of times, it stops in an ascending state, so the electric motor of the switchgear does not burn out as in the case where the elevator is repeatedly moved up and down until the obstacle is removed, and power is wasted. There is no waste.

Moreover, this stop is raised and stopped after the reversing lifting is repeated a predetermined number of times, regardless of the opening height of the opening and the size of the obstacle, so that after the lifting and lowering of the conventional timer time is repeated,
It is possible to completely avoid the risk that the shutter curtain will stop in a state of contacting the obstacle, which changes intricately depending on the height of the obstacle and the feeding state of the shutter curtain. Therefore, the safety is improved, the obstacles are easy to remove and there is no problem of crushing, and the number of reversing up and down is constant regardless of the height of the obstacle. It is possible to easily estimate the cumulative consumption of the battery based on the transmission operation of the above, and it is possible to reliably predict the battery life and easily set the battery replacement date for maintenance management, and to perform highly reliable maintenance management.

[Brief description of drawings]

The drawings show an embodiment of a safety device for an electric shutter according to the present invention. FIG. 1 is a front view and FIG. 2 is an operation system diagram. In the figure, 1 is a shutter curtain, 2 is a guide rail, and 3
Is a case, 4 is an electric motor, 5 is a seat plate, 6 is an obstacle detection switch, 7 is a transmitter, 8 is a receiver, 9 is a receiving circuit, 1
Reference numeral 0 is a reversing operation circuit, 11 is a counting control circuit, 12 is a lift control circuit, 13 is a push button switch, and A is a lift control circuit mechanism.

Claims (1)

[Scope of utility model registration request] 1. An electric shutter in which a shutter curtain is vertically moved up and down by forward and reverse driving of an electric motor to automatically open and close an opening, and a lift control circuit mechanism for the shutter curtain includes: Reversing operation circuit that outputs a control command that stops the falling of the shutter curtain in response to the detection command from the obstacle detection switch, then reverses and raises the shutter curtain, and then lowers it again, And a counting control circuit for outputting a stop signal for stopping the shutter curtain at the ascending position when the number of reversing vertical movements reaches a preset number. Safety device for shutters.