JPH04260594A - Handrail driving device for escalator - Google Patents

Abstract

PURPOSE:To improve safety by making a lever installed at a inserting pressure roll operate a limit switch with slipping of a handrail to open a driving circuit through a time relay by its contact output. CONSTITUTION:If foreign matter is inserted in the inlet part of a handrail 2 and so forth and the handrail 2 stops completely, a lever 12 turns off a limit switch 14 with vibration of a driving roller frame body 11. After a prescribed time passes, an off-delay timer is off and the holding circuit of an escalator is shut down to stop the escalator. It is thus possible to prevent a passenger who holds the handrail from tumbling by preceding steps to stop the handrail 2.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for an escalator handrail.

0003

2. Description of the Related Art A conventional escalator will be outlined with reference to FIG.

[0004] An escalator has steps 1 connected in an endless manner.
The handrail rotates from the lower floor to the upper floor to transport passengers, and in order for the passengers to grab onto it, handrails 2 are installed above the handrails on both sides of the steps 1, which rotate in synchronization with the steps 1. It's moving.

These steps and handrails are driven and run as follows.

[0006] A small sprocket 4, a chain 5, and a large sprocket 6 are rotated by the drive of the drive unit 3 in the machine room on the upper floor of the escalator, and a step sprocket 7 provided on the same axis is rotated.
The step 1 is rotated by a step chain 8 wrapped around the step. On the return trip, the handrail 2 is pinched by an upper handrail drive roller 9 and a lower pinching roller 10, and is driven by the frictional force between the canvas of the handrail 2 and the drive wheel.

[0007]

[Problem to be Solved by the Invention] Since the handrail of an escalator is driven by frictional force due to the pinching pressure between the handrail drive roller and the pinching roller, the frictional force is applied to the handrail in a direction opposite to the direction of movement of the handrail. The handrail will stop if an abnormal external force exceeding .

[0008] In such a situation, there is a risk that a passenger who was riding the escalator while holding on to the handrail may lose his or her body balance due to the stopped handrail and the preceding step and fall, causing an accident.

Furthermore, if the handrail remains stopped, the handrail drive roller continues to spin idly, causing damage to the handrail due to frictional heat.

The object of the present invention is to provide a mechanism for stopping an escalator in the event of an abnormality, in order to prevent the above-mentioned accidents.

[Configuration of the invention]

0012

[Means for Solving the Problems] In order to achieve the above object, the present invention fixes a lever to a drive roller frame that holds a pinch roller, and places a handrail slip detection device at a position where the tip of the lever presses. A limit switch shall be provided.

The circuit configuration is such that the lever attached to the drive roller frame continues to press the limit switch to form a closed circuit that continues the operation of the escalator, and the movement of the handrail is stopped and the drive roller frame is closed. vibrates, and the vibration spreads to the lever and disengages from the limit switch, which opens the limit switch and establishes an open circuit, forming a circuit that stops the escalator. Further, the limit switch is connected to a self-holding circuit and is configured to prevent the lever from swinging due to vibration of the drive roller frame when the escalator is started and to be removed from the limit switch.

[0014]

[Operation] With the above configuration, when a foreign object is caught in the escalator handrail and the escalator stops, the lever that presses the handrail slip detection limit switch suppresses the vibration of the drive roller frame. receive,
When the limit switch is disconnected from the limit switch, the limit switch turns off and the elevator stops.

[0015] In case of a momentary stoppage due to a passenger's malfunction or mischief, such as when the handrail is pulled backwards, an off-delay timer is interposed, and if the stoppage condition is resolved by the end of the time limit, the elevator will stop. You don't have to.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained based on the embodiments shown in FIGS. 1 to 3.

On the return trip side, the handrail 2 is clamped by an upper handrail drive roller 9 and a lower clamping pressure roller 10, and is driven by the frictional force between the canvas of the handrail 2 and the drive wheel.

During operation in the UP direction, the handrail 2 is moved by the handrail drive roller 9 and the pinch roller 10 in the ascending direction A on the outbound side and in the descending direction B on the return trip. A lever 12 is fixed to a drive roller frame 11, and its position is determined so that the tip of the lever 12 presses a limit switch 14.

A control circuit using the limit switch described above is constructed as shown in FIG.

That is, an escalator driving motor M, a command contactor U for its UP direction, and a command contactor D for its DN (DOWN) direction are provided, and when an abnormality is detected, the operating circuit is cut off and the escalator is immediately stopped. A safety confirmation circuit F for the escalator is provided.

The contact 14b of the limit switch 14 for detecting the slip of the handrail 2 is connected to the off-delay timer T.
is excited, and contact Ta of the off-delay timer is connected to a self-holding circuit. The escalator start switch SS is a three-point spring return type switch, and after the self-holding circuit is established, it returns to the neutral point to complete the operation.

With this control circuit configuration, when starting the escalator in the upward direction, when the start switch SS is turned in the UP direction, the motor M rotates in the UP direction and the step 1 moves in the direction of the arrow A shown in FIG. It rotates in synchronization with the handrail 2 in the upward direction. As shown in FIG.
operates the limit switch 14, and after a self-holding circuit is formed through the a contact Ta of the off-delay timer T, the switch SS is returned to the neutral point to complete the start-up and enter the normal running mode.

During normal running, if the handrail 2 comes to a complete stop due to some reason, for example, a foreign object gets caught in the inlet of the handrail 2, the vibration of the drive roller frame 11 causes the lever 12 to turn off the limit switch 14. ,
After a predetermined period of time has elapsed, the off-delay timer T is turned off, the self-holding circuit of the escalator is cut off, and the escalator stops. This prevents an accident in which the handrail 2 stops before the step 1 precedes the passenger, causing the passenger holding onto the handrail 2 to fall.

Furthermore, by operating the off-delay timer T by the limit switch 14, the off-delay timer T can be used to prevent the handrail from slipping due to a momentary stop due to mischief, malfunction, etc., rather than a long-term stop. If the slip is resolved and the escalator returns to normal by the end of the time limit, the escalator will not be stopped.

[0025]

As explained above, according to the present invention, only the handrail can be prevented from stopping during escalator operation, and damage to the handrail due to frictional heat caused by the stopped state can also be prevented. Furthermore, safety is improved by configuring the control circuit to avoid instantaneous stoppage of the handrail due to reverse pulling or the like caused by mischief by passengers.

[Brief explanation of the drawing]

FIG. 1: Schematic diagram of an escalator according to the invention,

[Figure 2]
Detailed view of part of FIG. 1,

FIG. 3 is a control circuit diagram of the device of the present invention.

[Explanation of symbols]

1...Steps
2...Handrail 9...Handrail drive roller
10...Pinch roller 11...Drive roller frame
12...Lever 14...Limit switch 20...Off delay timer (limited timer)

Claims (1)

[Claims] 1. A handrail drive device for an escalator that drives a handrail rail sandwiched between a drive roller that rotates in synchronization with moving steps and a pressure roller attached to a corresponding pressure roller frame. , an escalator handrail drive device characterized in that when the handrail slips, a limit switch is operated by a lever attached to the pinching roller frame, and the contact output thereof opens an escalator drive circuit via a time-limited relay. .