JPS6337033B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a safety device for a passenger conveyor.

[Conventional technology]

Passenger conveyors, such as escalators, are widely used and popular, but as a result, accidents involving infants and children around passenger conveyors (for example, their toes get caught between the steps and the railing skirt) tend to increase. Although the manufacturer is making efforts to prevent this, a complete safety device has not yet been realized. In this case, safety switches that detect a phenomenon and stop the operation of the passenger conveyor before a serious accident occurs have come into widespread use.

FIG. 1 is an example of a conventional safety device circuit for a passenger conveyor. When the start switch S is turned on, the coil 11x of the auxiliary relay is energized, which causes the auxiliary relay contact 11xa to close and hold itself, and at the same time, the main collector coil 11 is energized.
The main contact 11a is turned on and the electric motor M of the passenger conveyor
In other words, the passenger conveyor continues to operate. In this state, one of the safety switches in the safety device group
When the SW is activated, the auxiliary relay and the main contactor coils 11x and 11 are deenergized, and the main contact 11a is opened, so that the electric motor M, that is, the passenger conveyor, immediately enters a stopped state.

[Problem that the invention seeks to solve]

With this circuit configuration, it is clear that even if the switch SW is operated by mischief, the passenger conveyor will stop, and the current situation is such that the number of detection points that make up the switch SW is increasing in pursuit of safety. In some cases, stopping the passenger conveyor by unnecessary switch operation may lead to an increase in the frequency of stops, which can be fatal for the passenger conveyor users.

SUMMARY OF THE INVENTION An object of the present invention is to provide a safety device for a passenger conveyor that will not stop operating due to mischief or unconscious switch operation.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides, in addition to a safety switch for stopping the operation of the passenger conveyor,
An audio switch operated by an audio signal is provided, the audio switch being configured to respond only to a specific audio signal entering via the audio comparator, and activated when both the safety switch and the audio switch are activated to detect the passenger. A stop device was installed to stop the conveyor from operating.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. Note that the same reference numerals as in FIG. 1 indicate the same parts. In the embodiment of the present invention, the B contact of the relay 100 is placed in the coil energizing circuit of the auxiliary relay and the main contactor to constitute an operation stop device, and the safety device switch SW is placed in the coil energizing circuit of the relay 100. Configure a relay contact Va that becomes an audio switch in series with.

This relay contact Va transmits a signal sent from a microphone 2 provided at an appropriate position within the passenger use range of the passenger conveyor 1 to a comparator 3 and a comparator 4.
The circuit is configured such that the relay V is operated through the amplifier 5 only when the audio level exceeds a certain level, and the relay V is turned on by the operation of the relay V. Here, everything from the microphone 2 to the relay V constitutes a voice comparison device, and a well-known conversion and amplification device may be used as long as it meets the purpose of the present invention, so a detailed explanation will be omitted.

With the above configuration, even if one of the safety switches SW on the passenger conveyor is accidentally operated, the passenger conveyor will continue to operate as long as the relay contact Va is not closed. If a dangerous situation actually occurs here, some kind of sound will be emitted by the passenger or nearby passengers, so
This sound is output as a signal by the microphone 2, and the relay V is energized and the contact Va is closed.
That is, the safety switch SW and the relay contact Va in FIG. 2 are closed, the relay coil 100 is deenergized, the main contactor coil 11 is deenergized, and the operation of the passenger conveyor is stopped.

Here, it is quite conceivable that a time lag may occur between the signal from microphone 2 and the operation of the safety switch SW, but to deal with this, a time relay can be added to the circuit as needed. . However, the explanation will be omitted.

In this embodiment, for the sake of simplicity, a one-way operating circuit has been described, but it goes without saying that the same applies to a two-way reversible operating circuit.

〔Effect of the invention〕

As explained above, in the present invention, when the safety switch is activated, the passenger conveyor is stopped only when accompanied by a specific external voice, so if the safety switch is activated only due to mischief, unnecessary The operation of the passenger conveyor does not come to a halt, and the passenger conveyor's operating functions can be fully utilized.

[Brief explanation of the drawing]

Figure 1 is a safety device circuit diagram of a conventional passenger conveyor, Figure 2 is a safety device circuit diagram of the present invention, and Figure 3 is a safety device circuit diagram of a conventional passenger conveyor.
The figure is a skeleton diagram for outputting audio signals. DESCRIPTION OF SYMBOLS 1... Passenger conveyor, 2... Microphone, 3... Converter, 4... Comparison calculator, 5... Amplifier, 11... Main contactor coil, 11a... Main contactor contact, 1
1x...Auxiliary relay coil, 11xa...Auxiliary relay contact, S...Start switch, SW...Safety switch,
100...Relay coil, 100a...Relay contact,
V...Voice relay coil, Va...Voice relay contact,
M...Electric motor.

Claims (1)

[Claims] 1. In a safety device for a passenger conveyor, which is configured such that a safety switch that is operated by pressure is provided in the passenger use area of the passenger conveyor, and the operation of the passenger conveyor is stopped by the operation of the safety switch, an audio signal that is activated by an audio signal is provided. A switch is provided, and a voice comparison device is provided to select a specific voice for operating the voice switch, and a stop device is provided which is activated by the operation of both the safety switch and the voice switch to stop the operation of the passenger conveyor. A safety device for a passenger conveyor characterized by: