JPH03216483A - Safety device for elevator door - Google Patents

Abstract

PURPOSE:To contrive improvement of operation efficiency of an elevator by discriminating floor arrival of a cage for that by a cage call and a riding spot call and validating/invalidating a sensor output, for detecting each human body, by contents of these calls. CONSTITUTION:In the case of floor arrival of a cage 20 by cage call registration, when the floor arrival of the cage by its call is judged, in a call condition indicating circuit 13, the first sensor 10a is validated through a sensitivity adjusting circuit 11 by turning a sensitivity select command circuit 12 to a side (a), and a detection signal of the second sensor 10b is invalidated till a passenger 23 gets off from the cage 20 to go out of a detection range of the second sensor 10b, that is, to the time set by a timer 14. In the case of riding in the cage from a riding spot 25 with the cage arriving at a floor by a riding spot call, when an output of the call condition indicating circuit 13 is turned off, the first and second sensors 10a, 10b are validated for the time set by the timer 14 by turning the sensitivity select command circuit 12 to a side (b), and the sensitivity of the first sensor 10a is reduced by the sensitivity adjusting circuit 11 for the fixed time during which the passengers ride in.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a safety device for an elevator door that detects an elevator user using a sensor and restricts the opening and closing of the elevator door.

[Conventional technology]

Conventionally, this type of device was disclosed in Japanese Patent Application Laid-Open No. 58-20727.
There is No. 9 "Elevator door control method". This control method uses a load detection device that detects the presence of passengers in the elevator car, a non-contact human body detector that detects passengers entering and exiting the elevator car, and a transmitter at the top of the car that emits light to the bottom of the car. A detector is installed to detect the entry and exit of a passenger based on whether or not the reflected energy wave is received by a receiving device also installed at the top of the car, and based on the detection results of these two detection devices, it is determined whether the passenger gets off or gets on the car. and closes the elevator door.

(Problem to be solved by the invention) Although the non-contact type human body detector used in the conventional method has a wide detection sensitivity range and is convenient, it has the disadvantage that it detects unnecessary passengers because the detection range cannot be precisely limited. . for example,
As shown in Figure 2, after a passenger gets into the car and closes the car door, if the passenger stands near the car door because the car is full,
The passenger may be detected by a human body detector, and the car door may be reversed and opened. Furthermore, after a passenger exits the elevator or closes the door, the elevator may detect the exiting passenger, reverse the door, and reopen the door, resulting in a reduction in the operating efficiency of the elevator.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a safety device for an elevator door that can reliably open and close the door in response to passengers getting off and getting on the elevator.

[Means to solve the problem]

The elevator door safety device according to the present invention includes an elevator door that automatically closes after a certain period of time after the elevator door is opened, and a first sensor having human body detection sensitivity centered around the threshold of the car, and a first sensor centered around the landing area. a second sensor having a human body detection sensitivity; a door drive control section that controls the opening of the car door and the landing door based on the outputs of these sensors; and a call discrimination means for restricting the operation of each sensor according to the discrimination result, the first sensor output is enabled when the car call is discriminated, the second sensor output is disabled, and the second sensor output is disabled when the hall call is discriminated. After the first and second sensor outputs are enabled and the car door is closed,
The detection sensitivity of the first sensor is limited after a certain period of time has elapsed.

[Effect]

According to this invention, when the car lands on the floor and the door opens during car call registration, only the first sensor for detecting a passenger getting off the car is enabled, and the human body detection by the second sensor is disabled. By doing so, the door opening operation is reliably performed until the passenger gets off the train, and even if the passenger arrives at the landing, the closed door will not be reversed due to human body detection by the second sensor. In addition, if the car lands on the floor and opens the door at the landing call registration, the human body detection results of the first and second sensors will be valid, so human body detection will be performed until the passenger gets into the car from the landing. Elevator doors are kept open. Furthermore, since the first sensor output is limited after getting into the car, the car door will not be opened again when a passenger standing near the car door is detected.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a configuration diagram of the elevator door safety device in this embodiment. In the figure, (20a) is the first sensor installed near the threshold of the car, (20b) is the second sensor installed at the center of the landing, and (11) is the sensitivity adjustment circuit that adjusts the sensitivity of the first sensor (20a). , (12) is a sensitivity switching command circuit that commands sensitivity switching, (l3) is a call status indicating circuit that indicates that the car landing is the result of a car call, (24)
A timer (15) counts the elapsed time of landing of the elevator car and the elapsed operation time of the sensor. A door drive control circuit (15) controls the drive of the car door or the landing door in accordance with the output of each sensor.

Figure 2 shows the first sensor (loa) and the second sensor (10b)
It is a figure showing the human body detection sensitivity range of. In the figure, (2
0) is the elevator, (21) is the car door, (22) is the car threshold, (23) is the passenger in the car, (24) is the detection range of the first sensor (10a), (25) is the landing, ( 26)
is the landing door, (27) is the landing area, and (28) is the detection range of the second sensor (lob).

Next, the operation of this embodiment will be explained according to the above configuration. First, when the car (20) lands due to car call registration, the passenger (23) is the only person who exits the car, so in order to ensure the safety of the passenger alighting, the car door (2
1) In order to reliably open the door while exiting the vehicle and to improve driving efficiency when the door is left open after exiting the vehicle, it is necessary to detect a passenger who has exited the vehicle using a sensor and prevent the door from opening again. Therefore, when the call status indicating circuit (13) determines that the car has landed on the floor due to a call, it moves the sensitivity switching command circuit (12) to the a side and sends the signal to the first sensor (10a) via the sensitivity adjustment circuit (l1).
) is valid, and the detection signal of the second sensor (10b) is detected when the passenger (23) gets off the foot (20) and the second sensor (10b)
b) until it goes out of the detection range, that is, the timer (14)
Invalid until the time set in . As a result, passengers (23
) is within the detection range (24) of the first sensor (10a), it is detected by the first sensor (lOa), and based on the detection signal, the door drive control circuit (15) keeps the door (2l) open. do.

Furthermore, the passenger leaves the detection range (24) and the first sensor (1
0a) is out of detection and the car door (21) closes.
Even if the sensor detects a passenger (23), the detection signal is invalid, so the closed electric elevator door will not be opened again.

Next, the car lands at the landing call, and the car (
20), it is necessary to protect passengers from the landing door (20) and the car door (2l). Therefore, when the output of the call status indication circuit (13) turns OFF, the sensitivity switching command circuit (12) is turned to side b, and the first sensor (10a) and 2 sensors (
10b) is valid and a certain period of time during which the passenger boarded the vehicle,
The sensitivity of the first sensor + (10a) is reduced by the sensitivity adjustment circuit (11). As a result, both sensors (10a) and (10b
) detection range (28). While there are passengers in (24), the car door (22) and landing door (26) are kept open, and after a certain period of time has elapsed since the passenger gets into car (20), the closed doors become within a certain distance. When the first sensor (10a)
Even if the car is full and there are passengers standing near the car door, the sensitivity of the first sensor (10
a) detects the passenger and does not send a signal to the door drive control circuit (l5) to reverse the car door. Alternatively, the door may be closed at a low speed without reversing the door.

〔Effect of the invention〕

As described above, according to the present invention, the landing of the car is distinguished between the car landing by the car call and the landing call, and the sensor output for each human body detection is enabled or disabled depending on the content of these calls. Therefore, the passenger detection by the sensor prevents the car door or the landing door from being opened unnecessarily, which has the effect of improving the operating efficiency of the elevator.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an elevator door safety device according to an embodiment of the present invention, and FIG. 2 is a diagram showing the human body detection sensitivity range of each sensor. In the figure, (10a) and (Job) are the first and second sensors, (11) is the sensitivity adjustment circuit, (l2) is the sensitivity switching command generation circuit, (l3) is the call status indication circuit, (
14) is a timer, (15) is a drive control circuit, (20) is an elevator car, (2l) is a car door, (22) is a car sill, (23) is a passenger in the car, (25) is a landing, ( 26
) is the landing door, and (27) is the landing threshold.

Claims (1)

[Claims] The elevator door is equipped with an elevator door that automatically closes after a certain period of time after the elevator door is opened, and includes a first sensor having human body detection sensitivity centered around the threshold of the car, and a second sensor having human body detection sensitivity centered around the landing area. Based on these sensor outputs, there is a door drive control unit that controls the opening of car doors and landing doors, and a door drive control unit that determines whether the car has landed in response to a car call or a landing call, and operates each sensor according to the determination result. the first sensor output is enabled and the second sensor output is disabled when a car call is discriminated, and the first and second sensor outputs are enabled when a hall call is discriminated; A safety device for an elevator door, characterized in that the detection sensitivity of the first sensor is limited after a certain period of time has elapsed after the door is closed.