JPH0140943Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a safety feature of the shutter that automatically stops the descending operation of the shutter using a light path formed by a photoelectric sensing mechanism when there is an obstacle below the shutter seat plate. This relates to a stopping device.

Generally, a safety stop device for this type of shutter needs to detect an obstacle before it comes into contact with the shutter seat plate and automatically stop the shutter. Therefore, conventionally, the lower surface of the shutter seat plate was
A device that forms a single optical path from one end to the other end and stops the descending operation of the shutter when an obstacle blocks this optical path, or
Reflecting plates are provided in the vertical direction near the opposed guide rails at predetermined intervals, and the light beam projected from the upper side is bent by the reflecting plates,
There are known devices that receive light on the lower side to form a plurality of optical paths in the shutter opening/closing direction, and stop the shutter's lowering operation when an obstacle blocks part of the optical path.

However, in the case of the former, if the optical path is to be formed near the center line of the front and rear width of the seat plate, the light must be emitted from a position close to the shutter curtain, and when the shutter is opened and closed, In the latter case, the light path above the seat board is blocked by the blurring of the curtain, etc., resulting in malfunction. Since the light path is formed on one side, the disadvantage of the former is solved, but it is not possible to detect obstacles directly under the seat plate, and in any case, in both cases, the shutter seat plate is not connected to the shutter surface. Since the front and rear sides have a considerable width, obstacles can only be detected in either the front or rear, and the detection range for obstacles below the seat plate is extremely narrow, making it impractical. was lacking.

The present invention was developed in view of the above-mentioned circumstances and to eliminate these drawbacks.
In a shutter safety stop device configured to stop the lowering operation of the shutter by blocking an optical path formed on the lower side of the seat plate with respect to the width direction of the shutter opening, the optical path is arranged in the shutter opening/closing direction. A photoelectric sensor that emits and receives light from
The beam bending member bends the light beam projected from the photoelectric sensor at a position below the seat plate and receives the light again at the photoelectric sensor. The seat plate is located at a part of the seat plate that protrudes forward and backward from the shutter surface so that the light emitted from the photoelectric sensor is prevented even though the seat plate protrudes forward and backward relative to the shutter surface. This can be done at a location away from the shutter curtain surface, eliminating malfunctions when opening and closing the shutter.Furthermore, it expands the detection range of obstacles below the shutter seat plate, thereby making it possible to prevent objects from coming into contact with the shutter seat plate. To provide a safety stop device for a shutter capable of ensuring safety by surely stopping the descending operation of the shutter before it comes into contact with a seat plate even if there is an obstacle located either indoors or outdoors. The purpose is to

To explain the configuration of the present invention with reference to an embodiment shown in the drawings, in FIGS. 1 to 3, 1
1 is a shutter, and the shutter 1 is guided by left and right guide rails 2 to open and close vertically. Reference numeral 3 denotes an opening/closing drive mechanism for the shutter 1, and the shutter 1 is wound and rewinded by forward and reverse driving of the opening/closing drive mechanism 3.

Reference numeral 4 denotes a photoelectric sensor disposed on one end side of the shutter case 5. As shown in FIG. Before and after one end, a light projector 4a projects a light beam vertically downward, and a light receiver 4b receives the vertical light beam from below.

The shutter seat plate 6 has reflectors 7 as beam bending members on each front and rear sides of both ends thereof.
a, 7b, 7c, and 7d are provided. The relationship between these reflectors is such that the reflector 7a receives a vertically downward light beam projected from the upper projector 4a and reflects it in a horizontal direction below the shutter seat plate 6 and parallel to its front edge. The reflector 7b receives the reflected light beam and reflects it rearward at right angles, and the reflector 7c receives the light beam from the reflector 7b and reflects it at right angles below the shutter seat plate 6. The light is reflected in a horizontal direction parallel to its rear edge, and the reflector 7d reflects the reflected light vertically upward and receives it on the light receiver 4b. In this way, two optical paths L ₁ and L ₂ are formed below the shutter seat plate 6 along its front and rear edges. The reflectors 7a and 7d corresponding to the photoelectric sensor 4 are cylindrical, and the lower ends thereof have arcuate tongues 7a' and 7d' formed on the side surfaces, and are attached to the cylinders attached to the shutter seat plate 6. The reflectors 7a and 7d are pivoted so as to be rotatable in the left-right direction via a pivot shaft 6b loosely fitted to the shaft 6a, and when the shutter seat plate 6 is not in contact with the ground, the reflectors 7a and 7d stand up vertically due to their own weight. , the shutter seat plate 6 is designed to collapse when it touches the ground. 7a″, 7d″ are each reflector 7
These are the reflectors a and 7d. Further, the reflectors 7b and 7c disposed in the optical paths L ₁ and L ₂ have built-in reflectors 7b' and 7c' or prisms with an incident angle of 45 degrees, and these reflectors 7b and 7c stands up when the shutter seat plate 6 is not in contact with the ground via a connecting arm 6 that is pivotally supported by a mounting plate 6'' attached to the upright portion 6' of the shutter seat plate 6, and when the shutter seat plate 6 touches the ground, the pivot It is pivoted so as not to damage the reflectors 7b and 7c by rotating upward about the fulcrum a.
8 is an adjustment device that holds the reflectors 7b and 7c vertically when the shutter is lowered, and includes an elevation adjustment shaft 8' that is screwed into a bracket fixed to the mounting plate 6'';
It consists of a head 8'' formed at its upper end, and the head 8'' is brought into contact with the connecting arm 6 and moved up and down to set the verticality of each reflector.

In this embodiment, two optical paths L ₁ and L ₂ are shown, but it goes without saying that it also includes a reflected optical path in the front and back direction of the shutter seat plate 6.
A large number of optical paths may be provided, each of which may be formed into a continuous strip-shaped optical path, and the shutter may be automatically stopped in conjunction with blocking a portion of these optical paths. In addition, the reflector plate of the reflector is not limited to a flat plate, but if it is formed into a bowl shape to direct the emitted light beam, it is easy to deal with shakes of the shutter curtain when opening and closing the shutter. It is.

FIG. 4 is a block diagram of the opening/closing operation circuit of the shutter 1, and 9 is a timer circuit mechanism incorporating a delay timer 11 connected to a photoelectric sensing mechanism 10 and an alarm timer 13 connected to an alarm device 12. , 14 is a lift control circuit mechanism for forwarding and reversing the opening/closing drive 3 according to an input signal from the lift switch 15, and 16 is a limit switch circuit mechanism for detecting the upper and lower limits of the shutter 1 and stopping the lifting operation of the shutter 1. It is.

Since the present invention is particularly characterized by the lowering operation of the shutter 1, FIG. 5 further shows the circuit of the lowering operation circuit mechanism A. That is, the power supply circuits 17 and 17a from the power supply EP are connected in parallel with a relay switch 18 on the lowering side of the elevation control circuit mechanism 14, an alarm timer 13, a photoelectric sensor 4, a delay timer 11, and an alarm 12, and a relay The switch circuit 18a and the alarm timer circuit 13a are
Conduction 19 is established on the power supply circuit 17 side. The switch contacts 18s of the relay switch circuit 18a are provided on the side closer to the power supply circuit 17 than the conduction position 19 of the relay switch circuit 18a, and on the power supply circuit 3a of the opening/closing drive machine 3, respectively.

On the other hand, the switch contact 4s of the photoelectric sensor 4 is connected to the power supply circuit 17 side of the delay timer circuit 11a, the switch contact 11s of the delay timer 11 is connected to the power supply circuit 17a side of the relay switch circuit 18a, and the switch contact 13a of the alarm timer 13 is connected to the alarm circuit 12a
Each of these switch contacts is
Like the switch contact 18s, it is always open.

Further, in the alarm timer circuit 13a, with the conduction position 19 as the border, the lower operation switch contact 15s of the lift switch 15 is always open on the power supply circuit 17 side, and the limit switch circuit mechanism 16 is on the power supply circuit 17a side. A switch contact 16s on the lower limit side is provided in a normally closed state. In the figure, 2
Reference numerals 0 and 21 indicate a stop switch and an emergency stop switch provided in the power supply circuit 17, and 22 a control panel incorporating each of the above circuit mechanisms. Further, the set time T ₁ of the delay timer 11 is set to several seconds, and the set time T ₂ of the alarm timer 13 is set to a time equal to the descending time of the shutter 1 plus a predetermined time.

Next, the operation of the present invention configured as described above will be explained. To start the closed shutter 1, turn on the up side of the up/down switch 15.
The ascending side circuit of the elevation control circuit mechanism 14 is activated and the opening/closing drive unit 3 is rotationally driven, so that the shutter 1
will rise. At the upper limit of the shutter 1, the opening/closing drive mechanism 3 is stopped by the detection by the limit switch circuit mechanism 16, and the opening/closing operation of the shutter 1 is completed, as in the conventional case.

On the other hand, when lowering and closing the open shutter 1, the power source EP of the lowering operation circuit mechanism A is
When it is turned on, the photoelectric sensor 4 is activated and the switch contact 4s is activated.
is closed. As a result, the delay timer 11 is energized, and after several seconds (for example, 2 seconds) have elapsed, the switch contact 11s is closed and the circuit mechanism A is put into operation. After that, when the lowering side of the lift switch 15 (for example, installed at a distance where the shutter 1 cannot be seen) is turned on, an input is sent to the relay switch 18 and the alarm timer 13. As a result, all the switch contacts 18s of the relay switch 18 (three in this embodiment) are closed, and the opening/closing drive 3
is operated to lower the shutter 1, and at the same time, from now on, input is also received from the relay switch circuit 18 side. Then, when the shutter 1 descends and reaches the lower limit, the limit switch circuit mechanism 16 opens the switch contact 16s, and the photoelectric sensor 4 senses that the relay switch 1 is closed.
8 and the alarm timer 13, the switch contact 18s is opened to stop driving the opening/closing drive unit 3, and the closing operation of the shutter 1 is completed.

During such a downward movement of the shutter 1, if there is an obstacle below it near the path, this obstacle will block light projection and reception between the reflectors 7a, 7b, 7c, and 7d. The photoelectric sensor 4 senses this and opens the switch contact 4s, and the delay timer circuit 11a
cut off input. As a result, the switch contact 11s
is opened, the input to the relay switch 18 is cut off, and the driving of the opening/closing driver 3 is stopped. Therefore, since the shutter 1 is stopped in its lowering position upon detecting the obstacle before the shutter seat plate 6 comes into contact with the obstacle, the obstacle can be removed without raising the shutter 1. After the obstacle is removed, light projection and light reception between the reflectors 7a, 7b, 7c, and 7d are resumed, so the switch contact 4s of the photoelectric sensor 4
is closed and input to the delay timer 11, and the set time is
Shutter 1 resumes its descent after T ₁ has elapsed. Here, when the shutter 1 is lowering, for example, when a person tries to pass under the shutter 1 by force, if the photoelectric sensor 4 detects and stops the descent, the person who is the obstacle will immediately Although it is possible to pass through, the input is interrupted for a short period of time and a large load is applied to the opening/closing drive machine 3, but after the obstacle is removed, the photoelectric sensor 4 does not immediately resume descending. By doing so, the operation of the opening/closing drive device 3 can be made smoother, and the obstacle can be moved further away and there is enough room to escape, so that the descent can be resumed safely. ing.

On the other hand, the alarm timer 13
The alarm timer 13 has been activated for the set time T ₂ since the obstacle has not been removed.
When the time period elapses, the switch contact 13s closes and the alarm 12 issues an alarm, informing the surrounding area that it is necessary to remove obstacles.

In this way, with the present invention, the shutter 1 stops before it collides with an obstacle, so there is no need to repeatedly move the shutter 1 up and down and wait for the obstacle to be removed, unlike when a contact switch is provided. , Therefore, the structure of the drive mechanism can be configured easily, and
This also prevents the shutter seat plate 6 from colliding with an obstacle and damaging it each time the shutter 1 is repeatedly raised and lowered.

FIG. 6 shows another embodiment of the invention.
The difference from the previous example is that the conduction 19 between the relay switch circuit 18a and the alarm timer circuit 13a is eliminated and they are made independent, and the reference for the set time _T2 of the alarm timer 13 is removed from the start of the lowering operation of the shutter 1. Therefore, the alarm timer circuit 13a is provided with a normally closed switch contact 4s' of the photoelectric sensor 4, which is opened when the photoelectric sensor 4 receives input, and closed when the photoelectric sensor 4 detects an obstacle. By inputting the information into the alarm timer 13, an alarm can be issued with the reference time being the time when the shutter 1 stops due to detection of an obstacle.

By the way, when lowering the shutter 1, if there is an obstacle below the shutter seat plate 6, when the shutter 1 is lowered, the image formed on the photoelectric sensor 4 will appear immediately before the shutter seat plate 6 collides with the obstacle. Since some of the plurality of optical paths are blocked, the light beams no longer enter the light receiver 4b. Therefore, the opening/closing drive mechanism 3 stops operating and the lowering of the shutter 1 is stopped, so that an accident in which the shutter seat plate 6 comes into contact with or collides with an obstacle can be prevented. The sensing range below the shutter seat plate 6 is expanded by forming a plurality of optical paths not only directly below it but also along the front and rear edges. The lowering operation of the shutter 1 can be reliably stopped even in the position shown in FIG.
Further, in this embodiment, the photoelectric sensor is provided on the shutter case, but it may also be provided on the shutter seat plate without any problem.

In summary, the present invention provides a safety stop device for a shutter configured to stop the descending operation of the shutter in conjunction with blocking the optical path formed on the lower side of the seat plate in the width direction of the shutter opening. , the optical path consists of a photoelectric sensor that emits and receives light from the shutter opening/closing direction, and a beam bending member that bends the light beam emitted from the photoelectric sensor at a position below the seat plate and causes the photoelectric sensor to receive the light again. , the beam bending member is disposed at a portion of the seat plate that protrudes front and back from the shutter surface so that the optical path is formed in the front and rear regions sandwiching the shutter surface. Although it protrudes from the surface, it is possible to emit light from the photoelectric sensor at a position away from the shutter curtain surface, eliminating malfunctions when opening and closing the shutter.
The detection range of obstacles below the shutter seat board has been expanded, and even if there is an obstacle at either the indoor or outdoor side where it comes into contact with the shutter seat board, it can be detected both in front and behind the seat board across the curtain surface. This has very useful practical effects, such as being able to detect the shutter in the area of the shutter and ensuring safety by stopping the descending operation of the shutter before it contacts the seat plate.

[Brief explanation of the drawing]

The drawings show an embodiment of the safety stop device for a shutter according to the present invention, in which Fig. 1 is an overall front view of the shutter, Fig. 2 is a perspective view of the main parts, and Fig. 3 is a perspective view of the main parts.
4 is a block diagram of a shutter opening/closing operation circuit, FIG. 5 is a shutter lowering operation circuit diagram, and FIG. 6 is a shutter lowering operation circuit diagram showing another embodiment. In the diagram, 1 is the shutter, 2 is the guide rail, and 3
is an opening/closing drive mechanism, 4 is a photoelectric sensor, 4a is its emitter, 4b is a light receiver, 5 is a shutter case, 6
is the shutter seat plate, 7 is the beam bending member, 7a,
7b, 7c, 7d are reflectors, 8 is a vertical holding adjustment mechanism, 9 is a timer circuit mechanism, 10 is a photoelectric switch mechanism, 11 is a delay timer, 12 is an alarm, 13
14 is an alarm timer, 14 is an elevation control circuit mechanism, and 15 is an alarm timer.
16 is a lift switch, 16 is a limit switch circuit mechanism, 17 is a power supply circuit, 18 is a lowering side relay switch, 19 is conductive, 20 is a stop switch, 21 is an emergency stop switch, and 22 is a control panel.

Claims (1)

[Scope of utility model registration request] In a shutter safety stop device configured to stop the lowering operation of the shutter by blocking an optical path formed on the lower side of the seat plate with respect to the width direction of the shutter opening, the optical path is arranged in the shutter opening/closing direction. It consists of a photoelectric sensor that emits and receives light from the photoelectric sensor, and a beam bending member that bends the light beam emitted from the photoelectric sensor at a position below the seat plate and causes the photoelectric sensor to receive the light again, and the beam bending member includes: A safety stop device for a shutter, characterized in that the light path is disposed at a portion of the seat plate that projects forward and backward from the shutter surface so that the optical path is formed in the front and rear regions sandwiching the shutter surface.