JPH0631113Y2 - Safety switch in electric shutter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety switch in an electric shutter installed in an opening of a house, a building or the like. [0002] In general, the problems to be solved by the invention
Among such electric shutters, there is one in which an electric motor is driven by a remote operation command from a control room or the like provided in a separate part to move the shutter curtain up and down. In such a case, even if there is an obstacle that obstructs the descent of the shutter curtain, it cannot be directly confirmed from the control room, and if a descent control command is issued without knowing that there is an obstacle, There are various inconveniences such that the shutter curtain collides with an obstacle and the obstacle is damaged, or the reverse winding phenomenon of the shutter curtain occurs and the electric shutter itself is damaged. Therefore, there is a structure in which a sensor for detecting an obstacle is provided on the seat plate, and when the shutter curtain descends, the sensor senses the obstacle to stop the shutter curtain from descending. Conventionally, however, a sensor for sensing an obstacle has been constructed by attaching a thing such as a tape switch, which is closed and sensed by being pressed and contacted by the obstacle, to the lower surface of the seat plate. For this reason, the detection of an obstacle results in a state in which the obstacle is directly pressed against the seat plate by sandwiching the tape switch, and thus even if the shutter curtain immediately stops due to the detection of the obstacle, Obstacles can often be pressed and damaged by the seat plate, and simply stopping the shutter curtain will cause the seat plate to remain pressed against the obstacles. It was not possible to remove it, and it was necessary to consider raising the shutter curtain that had stopped due to the detection of an obstacle from the stopping position by an appropriate amount, which was a factor of complicating the control mechanism. . Therefore, there has been proposed a structure in which a light beam is made to travel under the seat plate so that the obstacle blocks the light beam to detect the obstacle. The reflector is installed to reflect the light rays from the light emitter / receiver attached to the shutter case, etc. in the vertical direction between the light emitter / receiver and one of the reflectors and in the horizontal direction between the left and right reflectors. While running, he sensed that the light beam between the left and right reflectors was blocked by an obstacle. However, this one uses light reflection because it is extremely difficult to adjust the angle of the reflection plate because the light from the light emitter / receiver must be reflected to change it vertically and horizontally. However, there is a problem that the light is extremely dimmed (loss), and a strong light source and a highly sensitive light receiving system are required. In addition, the reflector must be installed so that it projects below the bottom surface of the seat. In that case, when it is fully closed, the reflector will come into contact with the ground before the seat plate, and if stopped at this point, the seat plate will be in an incompletely closed state where it does not contact the ground, On the other hand, when the seat plate is lowered until it touches the ground, there is still a problem in that the reflector plate is pressed against the ground and damaged. SUMMARY OF THE INVENTION The present invention was devised with the object of providing a name capable of eliminating these drawbacks in view of the above-mentioned actual circumstances. In the electric shutter that drives the electric motor according to the command from the above to move up and down while guiding the shutter curtain to the left and right guide rails, the left and right ends of the seat plate at the bottom end of the shutter curtain are hidden by the guide rails. The projector and the light receiver are arranged at a position projecting below the lower surface of the seat plate so that the optical path is blocked before an obstacle that obstructs the descent of the shutter curtain comes into contact with the seat plate. Is provided with a transmitter for transmitting a stop signal to a receiver on the side of the elevation control mechanism when the optical path is cut off, and a power supply for operating the transmitter and the light emitter / receiver. Together, the light emitter / receiver is provided so as to be retractable with respect to the seat plate so that it can be retracted into the seat plate from the bottom surface of the seat plate by being pushed up from below, and in the upper and lower limit states of the shutter curtain. It is characterized in that a switching switch for turning off the power is provided. According to this structure, the present invention can provide an emitter / receiver on the lower surface of the seat plate to make an emergency stop before an obstacle comes into contact with the seat plate. This is to ensure the protection of the light receiver. An embodiment of the present invention will be described below with reference to the drawings. In the drawings, 1 is a shutter curtain of an electric shutter, and the shutter curtain 1 moves up and down by being driven by an electric motor 2 in response to a command from an elevator control mechanism A provided in a control room. However, the opening / closing operation of the opening is performed. Incidentally, 3 is a guide rail and 4 is a shutter case. Reference numeral 5 denotes a seat plate attached to the lower end of the shutter curtain 1. The seat plate 5 is formed of a cylindrical shape member in this embodiment, but is a guide rail of the seat plate 5. The left and right ends hidden by 3 are opened by notching the bottom surface. A movable box 6 is fitted in the opening 5a so as to be slidable in the vertical direction. At the position before reaching the lower limit position of the shutter curtain 1, the movable box 6 projects downward from the seat plate 5 by its own weight. However, when the shutter curtain 1 descends to the lower limit position, the bottom surface of the movable box 6 contacts the floor surface and sinks into the seat plate 5, so that the seat plate 5 contacts the floor surface. Reference numeral 7 is a light projector installed in one movable box 6,
Reference numeral 8 denotes a light receiver installed in the other movable box 6, and these light emitters / receivers 7 and 8 allow the movable box 6 to hang down below the bottom surface of the seat plate 5 to form a seat. An optical path B that is blocked by the presence of an obstacle is formed below the plate 5.
Then, these projectors / receivers 7, 8 and a transmitter 10 described later
Is connected to a power source (battery) 9 provided at an appropriate position on the upper surface of the seat plate 5 on the indoor side through a lead wire 9a. The transmitter 10 is mounted on the upper surface on the indoor side of the seat plate 5 like the power source 9, but emits an optical signal to the receiver 11 mounted on the shutter case 4 side. No optical signal is emitted from the optical path B when the optical path B is not blocked, but is transmitted when the optical path B is blocked by the presence of an obstacle that obstructs the descent of the shutter curtain 1. It has become. Further, the receiver 11 is linked to the above-described lifting control mechanism A, and upon receiving the optical signal from the transmitter 10, a stop command for stopping the lowering of the shutter curtain 1 is issued to the lifting control mechanism A. It is being issued. Further, reference numeral 12 is a switching switch, which is provided on the seat plate 5. The switching switch 12 has switch levers 12a, 1a.
2b are provided respectively. One of the switch levers 12a is opened by being disengaged from the guide rail 3 when the shutter curtain 1 is at the upper limit, and the other switch lever 12b is based on that the seat plate 5 is grounded when the shutter curtain 1 is at the lower limit. Moved movable box 6
The switching switch 12 is opened by being pressed by the switch lever 12a,
By opening based on the operation of 12b, the power is turned off and the operations of the light emitting / receiving devices 7 and 8 and the transmitter 10 are automatically stopped. In the embodiment of the present invention constructed as described above, when a command for lowering the shutter curtain 1 is issued from the lifting control mechanism A, the electric motor 2 is driven in response to this command and the shutter curtain 1 is received. Will fall. At this time, if an obstacle is encountered during the descent of the shutter curtain 1 to hinder the descent of the shutter curtain 1, in the present invention, before the seat plate 5 hits the obstacle, the seat plate 5 is moved downward. The formed optical path B is blocked by an obstacle, and the transmitter 10 which receives the optical path B transmits an optical signal to the receiver 11, whereby the shutter curtain 1
Will immediately stop the descent of. As described above, according to the present invention, the presence or absence of an obstacle is detected by blocking the optical path B running under the seat plate 5, and when an obstacle is present, before the seat plate 5 collides with the obstacle. The shutter curtain 1 can be stopped without fail, and damage to obstacles can be prevented in advance.
Is formed directly by using the light emitters / receivers 7 and 8 provided at the left and right ends of the seat plate 5, so that there is almost no optical loss as in the case of using the conventional reflection plate. It is not necessary to use a particularly large amount of light on the side of the projector 7,
In addition, it is not necessary to use a particularly sensitive one on the side of the light receiver 8, and it is possible to make it extremely versatile, so that the light emitting and receiving devices 7 and 8 consume less power and the guide rail 3 is used. It can be small enough to fit inside. Furthermore, since the transmitter 10 emits an optical signal from the transmitter 10 only when the optical path B is blocked by an obstacle, the power consumption by the transmitter 10 is normal. Sometimes very little. Therefore, the projectors / receivers 7, 8 and the transmitter 10 are installed in the shutter case 4
The power source 9 can be operated by a power source 9 which is completely independent of the power source side (building side), but the durability time of the power source 9 can be remarkably lengthened, and replacement or charging of the power source 9 is unnecessary for a long time. You can In addition, it is not necessary to bend the light path between the light emitters / receivers 7, 8 by 90 degrees vertically and horizontally using a reflector as in the conventional case, and the light emitters / receivers 7 arranged linearly
Since it can be directly carried out by means of 8, the optical axis adjustment is extremely easy, and accurate sensing can be carried out without being shaken even by some vibration. Moreover, since the light emitters / receivers 7 and 8 are housed in the movable box 6 which can be retracted from the seat plate 5, the light emitters / receivers 7 and 8 are kept on the ground when fully closed. It will be pushed up from below and will be immersed in the seat plate 5. As a result,
The seat plate 5 can surely be grounded without being disturbed by the light emitters / receivers 7 and 8 provided for forming an optical path below the lower surface of the seat plate. , 8 are protected by the weight of the shutter curtain 1 without being damaged. In order to protect the light emitters / receivers 7 and 8, it is conceivable to make a hole in the ground corresponding to the light emitters / receivers 7 and 8 and to immerse and protect the ground when fully closed. Since it is on the ground, mud and pebbles easily enter and become clogged, and reliable protection of the light emitters / receivers 7 and 8 cannot be measured for a long period of time, but this is not the case with the present invention. Further, since the light emitters / receivers 7 and 8 are arranged at the portion hidden by the guide rail 3, the light emitters / receivers 7 and 8 project downward from the lower surface of the seat plate 5,
In a normal state, this is not touched by the eyes of the person and is not mischievous, so that the projectors and receivers 7 and 8 can be reliably protected. Further, the electric devices mounted on the seat plate 5 such as the light-emitters / receivers 7 and 8 and the transmitter are automatically opened by the switching switch 12 when the shutter curtain 1 is at the upper limit and the lower limit. Since the operation of the electric equipment is automatically stopped by turning off the power supply to the power source, wasteful consumption of the power source 9 can be prevented, which is more convenient. [Effects] In summary, since the present invention is constructed as described above, the presence or absence of obstacles is sensed by the interruption of the optical path running below the seat plate, and the shutter curtain. The optical path for detecting obstacles can be reliably stopped before it comes into contact with obstacles and damage to the obstacles can be prevented. It becomes a light beam that runs between the light receivers, and as a result, it is completely unnecessary to use a reflector that is difficult to adjust and has a large optical loss as in the past. Therefore, accurate optical path adjustment is called adjustment of the mounting angle of the emitter and receiver. Since it is not possible to perform it easily and surely by direct adjustment work, the light loss is extremely small, and it is possible to use a weak light amount on the sender side and sensitivity on the receiver side. Even if you use a low one It can be carried out sensing in degrees high obstacles. In addition, since the light emitter / receiver projects below the bottom surface of the seat plate, the light emitter / receiver will come into contact with the ground in advance when fully closed. It will be pushed up from the ground and will be immersed in the seat. As a result, the seat plate can be surely grounded without being disturbed by the light projecting / receiving device projecting below the lower surface thereof, and can be in a fully closed state with no gaps. The light receiver is not damaged, and reliable protection of the light emitter / receiver can be reliably achieved for a long period of time. Further, since the light emitter / receiver is arranged at a portion hidden by the guide rail, the light emitter / receiver projects downward from the lower surface of the seat plate, but this is in a normal state to human eyes. The projector and the receiver can be reliably protected without being touched and thus being mischievous. Also, when the shutter curtain reaches the upper limit state or the lower limit state, the switching switch provided in the light emitter / receiver automatically turns off the power, and these operations are automatically stopped. This is more convenient because it is possible to prevent unnecessary power consumption.

[Brief description of drawings] FIG. 1 is a front view of an electric shutter. FIG. 2 is an enlarged front view of a seat plate portion. FIG. 3 is a vertical sectional view of a seat plate. FIG. 4 is a chart of a sensing mechanism. [Explanation of symbols] 1 Shatter curtain 2 electric motor 3 guide rails 4 shutter case 5 seat plate 6 movable boxes 7 Floodlight 8 light receiver 9 power supplies 10 transmitter 11 receiver 12 Switch

Claims (1)

[Claims for utility model registration] 1) In the electric shutter that drives the electric motor according to a command from the lifting control mechanism to move the shutter curtain up and down while guiding it to the left and right guide rails, At the left and right ends of the bottom plate, which are hidden by the guide rails, are located below the bottom surface of the seat plate so that the optical path is blocked before an obstacle that obstructs the descent of the shutter curtain contacts the seat plate. While a light transmitter and a light receiver are arranged, a transmitter for transmitting a stop signal to the receiver on the elevation control mechanism side by blocking the optical path, and a power supply for operating the transmitter and the light receiver are further provided on the seat plate. In addition, the light emitter / receiver is provided so as to be retractable with respect to the seat plate so that it can be retracted into the seat plate from the lower surface of the seat plate by pushing up from below. A safety switch in an electric shutter, which is provided with a switching switch for turning off the power in the upper limit state and the lower limit state of the tutor curtain.