JP2000238985A - Elevator doorway safety devices - Google Patents

Abstract

(57) [Problem] To provide an elevator entrance / exit safety device capable of preventing a malfunction and reliably detecting an obstacle. SOLUTION: A plurality of luminous bodies 1 are provided on a door stop side of a car door 2.
The light emitter 5 and the light receiver 6 are arranged to face each other such that the light emitters 1a to 11z and the light receiver 17 are opposed to each other. By setting it as low as about 70%, malfunction due to bounce light reflected on the surface of the car sill is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for an elevator entrance provided with a plurality of non-contact sensors for detecting obstacles at the entrance and exit of the elevator.

[0002]

2. Description of the Related Art Generally, an elevator doorway has a car threshold 2 as shown in the cross-sectional view of the elevator doorway shown in FIG.
A pair of car doors 2a and 2b guided along 0 are provided on the car 1, and a pair of hall doors 4a and 4b interlocked with the car doors 2a and 2b are provided on the hall 3 side.

A conventional safety device at an elevator entrance having such a structure is, for example, an infrared detection device as described in Japanese Patent Application Laid-Open No. Hei 8-199856, and is shown in FIG. 2 and FIG. As shown in the front view and the cross-sectional view thereof, the car door 2a is installed near the end of the door on the door stop side of the car door 2a from the car sill 20 to a height that does not hinder the opening and closing of the door, for example, about 10 mm from the upper position to almost the entire height. And a light receiver 6 arranged in the vicinity of the end of the door on the door stop side of the car door 2b so as to face the light emitter 5, and an obstacle that may be interposed between the car doors 2a and 2b. Is detected. The light projector 5 includes a printed circuit board 10 in a case 8 in which a translucent acrylic plate 9 is mounted in an opening 7 formed on a side facing the light receiver 6.
And a plurality of diodes 11 which are light emitters arranged on the printed circuit board 10. Similarly, the light receiver 6 has an opening 13 formed on the side facing the light projector 5.
A printed circuit board 16 and a plurality of photoreceptors 17 arranged on the printed circuit board 16 are housed in a case 14 in which a translucent acrylic plate 15 is mounted.

As shown in FIG. 4 which is a vertical sectional view, the height of the cases 8 and 14 is
The thickness is set to about 00 mm, the width is about 40 mm, and the thickness is about 10 mm. The lowermost diode 11a and the photoreceptor 17a are provided at a position about 25 mm from the lower ends of the cases 8 and 14, and a plurality of them are arranged at an equal interval of about 45 mm upward from this position. Are equivalent. Wirings 12 and 18 are connected to the diode 11 and the photoreceptor 17 via printed boards 10 and 16, respectively.

The conventional safety device for the entrance and exit of the elevator constructed as described above, when the infrared rays 19 are radiated in the horizontal direction from the diode 11 of the light projector 5 to the light receiver 6 via the acrylic plate 9 respectively, the car doors 2a and 2b. If there is no obstacle in between, the infrared rays 19 cross the gap between the car doors 2a and 2b and then pass through the acrylic plate 15
And the light is detected by the photoreceptor 17. on the other hand,
If the infrared light 19 emitted from the diode 11 of the light emitter 5 is not detected by the light receiver 17, it is determined that an obstacle exists in the gap between the car doors 2a and 2b, and the light detector 6 outputs an obstacle detection signal. .

[0006]

However, in the conventional safety device for an elevator entrance, a passenger pushes a bogie 30 shown in FIG.
When trying to get into car 1 from the side, a general trolley 3
If the zero loading platform 31 has a height of about 150 mm from the car sill 2b and a thickness of about 40 mm, the loading platform 31 blocks the infrared rays 19d emitted from the fourth diode 11d from the lower end of the light projector 5 toward the light receiver 6. As a result, the trolley 30 is detected, and the car doors 2a and 2b and the landing doors 4a and 4b are opened again, and the car doors 2a and 2b and the landing doors 4a and 4b are opened.
Although it is expected to prevent the carriage 30 from being sandwiched between them, it has been newly found that there is a risk that the following problems may occur. That is, when the car sill 2b for guiding the car doors 2a and 2b is made of stainless steel or the like and the surface of the car sill 2b is cleaned well, FIG.
As shown in the cross-sectional view of FIG. 7, infrared light 19d is emitted from the diode 11d toward the light receiver 6, and a part of the infrared light 19d1 is reflected on the surface of the car sill 2b to the light receiver 17d facing the diode 11d. Enter this and use infrared 1
Because of the erroneous detection of 9d, there is a danger that the loading platform 31 cannot be detected normally, and the loading platform 31 is pinched between the car doors 2a and 2b and the landing doors 4a and 4b.

An object of the present invention is to provide an elevator entrance / exit safety device capable of preventing a malfunction and reliably detecting an obstacle.

[0008]

In order to achieve the above object, the present invention comprises a plurality of pairs of light emitters and light receivers in the height direction near an upper part of a car sill so as to detect an obstacle at an elevator entrance. In the safety device of the elevator entrance and exit provided with the light emitter and the light receiver arranged, the light emitter and the light receiver arranged at the lower of the light emitter and the light receiver,
It is characterized in that it is set so as not to malfunction due to bounce light at the car sill.

As described above, the safety device for the entrance and exit of the elevator according to the present invention is set so as to prevent malfunctions due to bounce light of the light-emitting body and the light-receiving body arranged at the lower part. Even when the surface of the sill is made of stainless steel or the like and the surface is cleaned well, an obstacle can be reliably detected without malfunction.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a safety device for an elevator entrance according to an embodiment of the present invention. The basic configuration of the light projector 5 and the light receiver 6 provided on the door stop side of the opposing car door is almost the same as the conventional configuration shown in FIG. 2, FIG. 3 and FIG. That is, the light projector 5 includes a printed circuit board 10 and a plurality of light emitters 11 arranged on the printed circuit board 10 in a case 8 in which a translucent acrylic plate 9 is attached to an opening 7 formed on a side facing the light receiver 6. The light receiver 6 includes a printed board 16 and a printed board 16 in a case 14 in which a translucent acrylic plate 15 is mounted in an opening 13 formed on the side facing the light projector 5.
It is configured to house a plurality of photoreceptors 17 arranged above.

Cases 8 and 14 for projector 5 and receiver 6
Have the same symmetrical configuration, have a height of 2000 mm and a width of 40 mm, and a plurality of light-emitting bodies 11 and light-receiving bodies 17 respectively housed therein are arranged facing each other in pairs. The lowermost luminous body 11 a of the luminous bodies 11 is disposed at a position 25 mm from the lower end of the case 8, and the lowermost luminous body 11 a is located at a position 4 mm from the second luminous body 11 b from the lower end of the case 8.
The light-emitting members 11z up to the 0-th light emitter are arranged at equal intervals of 45 mm. Further, each of the luminous bodies 11a to 11z does not have the same infrared output, but has a difference between those arranged at the lower part and those arranged at the upper part. The output is set small so that the photoreceptor does not operate due to the reflected light from the lower part. For example, the infrared output from the first illuminant 11a to the eighth illuminant 11h is equivalent to the ninth illuminant 11i to the 40th illuminant 11z.
The infrared output is set to about 70% lower than that of the infrared output.

Next, the operation of the above-described elevator doorway safety device will be described with reference to FIG. 6 which is a side view of the elevator doorway. Detection of a passenger or the like can be reliably performed as in the conventional case. Also, the cart 30 shown in FIG.
When the passenger pushes and tries to get into the car 1 from the landing 3 side, the bed 31 of the general bogie 30 moves from the car threshold 2b to 1
When the height is about 50 mm and the thickness is about 40 mm, the loading platform 31 detects the carriage 30 as a result of blocking the infrared rays 19d emitted from the fourth light emitting body 11d from the lower end of the projector 5 toward the light receiver 6. Car doors 2a, 2b and landing door 4
a and 4b are opened again to prevent the carriage 30 from being pinched between the car doors 2a and 2b and the landing doors 4a and 4b.

As described above, in the conventional elevator doorway safety device, the car sill 2b for guiding the car doors 2a and 2b is made of stainless steel or the like, and the surface of the car sill 2b is cleaned well. In this case, as shown in the cross-sectional view of FIG. 7, the infrared light 19d is emitted from the light emitting body 11d toward the light receiver 6, and a part of the infrared light 19d1 is reflected on the surface of the car sill 2b to emit the light emitting body 11d. Enters the photoreceptor 17d opposite to the light receiving body 17d, and the rebounded light is erroneously detected by the photoreceptor 17d as infrared light 19d.
1 could not be detected normally, and there was a danger of being caught between the car doors 2a, 2b and the landing doors 4a, 4b.

However, in the safety device for an elevator entrance shown in FIG. 1, a plurality of illuminants 11a to 11h arranged at the lower part and illuminants 11i to 11h arranged at the upper part are provided.
At z, the infrared output is differentiated, and the luminous body 1
The infrared outputs of the light emitters 11i to 11z arranged below are set to be about 30% smaller than the infrared outputs of 1a to 11h. The luminous bodies 11a to 11 thus positioned at the lower part
Since the output of h is set low, even if a part of the infrared rays 19d1 of the infrared rays 19d is reflected on the surface of the car sill 2d and enters the photoreceptor 17d facing the illuminant 11d as shown in FIG. The body 17d does not malfunction with the attenuated bounce light of low infrared output. Therefore, the carriage 30
Erroneous detection due to bouncing can be prevented, and the trolley 30 can be prevented from being caught by the car doors 2 and 2a and the landing doors 4 and 4a. It becomes possible to provide a safety device for a high elevator entrance.

In the above-described embodiment, the infrared rays 19a from the lowermost luminous body 11a to the eighth luminous body 11h are used.
Are output from the ninth to fortyth light emitters 11i to 11z.
Was set to about 70% of the infrared output of the
The optimum infrared output can be set by a controller or the like (not shown) depending on the material and surface condition of the device, so that malfunction due to bounce light can be prevented. In addition, since the output of the luminous body at the position can be changed as appropriate in accordance with a specific detection object, the infrared output of the entire lower portion does not have to be set low. Further, the detection sensitivity of the photoreceptor 17 side is adjusted, the detection sensitivity of the photoreceptor located at the lower part is set lower than the detection sensitivity of the photoreceptor located at the upper part, and the detection sensitivity is adjusted so as not to operate with the rebound light. The effect of can be obtained.

[0016]

As described above, the safety device for the entrance of an elevator according to the present invention does not malfunction the light emitting element and the light receiving element disposed at the lower part by the bounce light, so that the bounce light reflected from the surface of the car sill is reflected. Erroneous operation can be prevented, an obstacle can be reliably detected, and reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a safety device for an elevator entrance according to an embodiment of the present invention.

FIG. 2 is a front view of a car door of a conventional safety device for an entrance of an elevator.

FIG. 3 is a cross-sectional view of the safety device for the elevator entrance shown in FIG. 2;

FIG. 4 is a longitudinal sectional view of the safety device for an elevator entrance shown in FIG. 3;

FIG. 5 is a cross-sectional view of the elevator entrance shown in FIG.

FIG. 6 is a side view of the elevator entrance showing a state in which the bogie has passed.

FIG. 7 is a longitudinal sectional view of the elevator entrance shown in FIG.

[Explanation of symbols]

 2,2a car door 4,4a landing door 5 light transmitter 6 light receiver 8 case 11,11a-11z light emitter 17 light receiver 20 car sill

Claims (3)

[Claims] 1. An elevator doorway safety device having a plurality of pairs of light emitters and light receivers arranged in a height direction near an upper portion of a car threshold to detect an obstacle at the elevator doorway. In the apparatus, the light emitting body and the light receiving body disposed below the light emitting body and the light receiving body are set so as not to malfunction due to bounce light at the car sill, and a safety device for an elevator entrance and exit. . 2. The light-emitting device according to claim 1, wherein said light-emitting member and said light-receiving member disposed at a lower portion have lower detection sensitivity than said light-emitting member and said light-receiving member disposed at an upper portion. Safety devices for elevator entrances. 3. The safety device according to claim 1, wherein the luminous body disposed at a lower portion has a lower output than the luminous member disposed at an upper portion.