JPS6035758Y2 - Obstacle detection mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device in an automatic opening/closing device such as an electric shutter.

Conventionally, as a shutter safety device using a photoelectric detection device, a reflector is pivoted to the top surface of the seat plate, and when a seating member provided on the bottom surface of the seat plate is pressed, the reflector rotates in conjunction with the pressure. (Utility Model No. 53-151638)
No.) is known.

By installing the emitter and receiver of the photoelectric detection device on the building side in this way, there is no need for wired or wireless electrical equipment to connect the shutter body, which opens and closes, and the building side, which does not move, and the configuration of the safety device is improved. It has the advantage of being simple.

However, in this prior design, the light emitted from one projector is reflected at one point on the reflector on the seat plate and returns to one receiver, so the photoelectric detection device can identify only one point on the reflector. It is only the displacement of .

Therefore, in order to detect an obstacle on the lower surface of the seat plate over its entire length, a rigid obstacle abutting member, that is, a seating member, extending over the entire length of the seat plate is required, and furthermore, a The case of collision with an obstacle must also be considered.

This invention detects obstacles along the entire length of the underside of the seat plate.
Regarding safety devices such as electric shutters that use photoelectric detection means, optical systems are installed at both left and right ends of the bottom surface of the seat plate in order to form a detection optical path parallel to the bottom surface of the seat plate, and a light emitter and light receiver are installed correspondingly. It is characterized by the fact that the containers are placed above and below the seat plate.

The present invention will be described in detail below according to embodiments shown in the drawings.

FIG. 1 is a schematic diagram of a safety device for an electric shutter according to the present invention, in which 1 is the main body of the shutter, 2 is a seat plate thereof, and 3 is a hollow structure made of a flexible material fixed to the bottom surface of the seat plate. An obstacle abutting member, 4 is a detection optical path of a photoelectric detection device set in the corresponding abutting member parallel to the seat plate, and 5 and 6 are reflecting mirrors constituting the optical path.

That is, the reflecting mirror is made of a synthetic resin plate by vapor-depositing metal in the form of a band to give it a mirror surface, and is rotatably attached to the lower surface of both ends of the seat plate 2, and is usually rotated by its own weight. It occupies a position inclined at 45 degrees with respect to the seat plate 2 (see Fig. 2).

The first reflecting mirror 5 on the left side has a mirror surface on its back side, and the light from the projector 7 of the photoelectric detection device buried under the floor directly below the reflecting mirror is directed through the opening of the obstacle abutting member 3. 3 and reflects the light to a second reflecting mirror 68 on the right side.

The second reflecting mirror 6 has a mirror surface on its front side, and directs the light from the first reflecting mirror 5 to the light receiver 8 of the photoelectric detection device provided directly above the opening 3 □ of the contact member 3 and It is reflected through the opening 2° of the seat plate 2.

Therefore, when the obstacle abutting member 3 hits an obstacle, is pressed and deformed, and blocks the detection optical path, or when the reflecting mirror rotates, the detection circuit of the photoelectric detection device captures the change in the amount of light. identify it.

This embodiment has the advantage that the length of the optical path from the light projector to the light receiver is constant regardless of the position of the seat plate, that is, the open/closed state of the shutter body.

Therefore, by providing the telephoto lens 9 on the projector side or the light receiver side, the influence of external light can be effectively eliminated.

Note that the present invention is not limited to the embodiments described above, and the light receiver 8 may be replaced with a light projector/receiver, and the light projector 7 may be replaced with a reflecting plate.

Furthermore, if laser light is used as the light source, there will be no problem even if the length of the optical path from the emitter to the receiver changes depending on the open/closed state of the shutter body, so the left reflecting mirror 5 can be fixed vertically. It is also possible to place the light emitter and receiver at the position of the light receiver.

Further, if there is no need to consider that the reflecting mirrors may be damaged due to contact with obstacles, there is no need to make them rotatable or retractable, and a known optical system may be used instead.

In such a case, if the influence of external light is small, there is no need to provide an obstacle abutting member.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of an electric shutter according to the present invention, and FIG. 2 is an enlarged sectional view of a reflecting mirror portion. 1...Shutter main body, 2...Seat plate,
3... Obstacle abutting member, 4... Detection optical path, 5, 6... Reflector, 7... Floodlight, tail... Receiver.

Claims (2)

[Scope of utility model registration request] (1) A detection optical path 4 is set at the tip of the tip end 2 of the moving opening/closing member 1, parallel to the tip and spanning almost the entire width, and the optical path is provided on the building side from the opening/closing direction of the opening/closing member. A first optical system 5 bends the light from the floodlight 7 by 90 degrees and inputs it into one end of the optical path, and a first optical system 5 bends the light from the floodlight 7 by 90 degrees and inputs it into one end of the optical path. An obstacle detection mechanism characterized by comprising a second optical system 6 which sends light in the opening/closing direction after being bent by 90 degrees or 180 degrees to a light receiver 8 provided on the side. (2) The first optical system 5 inputs light in one of the open and close directions into the detection optical path 4, and the second optical system 6 inputs light in one of the open and close directions, and the second optical system 6 2. The obstacle detection mechanism according to claim 1, wherein the light from the object is bent by 90 degrees S and transmitted in the one direction.