JPS61257888A - Controller for man conveyor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a control device for a passenger conveyor such as an escalator, and more particularly to a control device for a passenger conveyor suitable for ensuring the safety of passengers.

[Background of the invention]

Fig. 2 is a schematic diagram showing the overall structure of an escalator, including steps 2 arranged in an endless manner to carry passengers, an endless handrail 1 running in the same direction and at the same speed as the steps 2, and The handrail 1 is driven in the same direction and at the same speed as the step 2 due to the frictional force between the step gear 3 driving the step 2 and the drive pulley 4 driven via the chain 5. 6 and 7 are guide rollers that guide the handrail 1, 8 is a step rail that guides the steps 2, and 9 is a frame that supports all these members.

By the way, as mentioned above, the handrail 1 is driven by the frictional force with the drive pulley 4, so when the ambient temperature drops, such as in winter, the bending rigidity of the handrail 1, which is mainly made of rubber, increases. Running resistance increases. In particular, when starting after stopping for a long time, the long stop causes the handrail 1 to bend and the running resistance of the handrail 1 increases, and eventually the running resistance becomes larger than the frictional force between the drive pulley 4 and the handrail 1. hand.

There is a problem in that slippage occurs between the drive pulley 4 and the handrail 1, causing the operating speed of the handrail 1 to become slower than the operating speed of the steps 2, or in the worst case, to stop. In addition, for escalators installed outdoors, the drive pulley 4
Rainwater enters between the drive pulley 4 and the handrail 1.
In order to reduce the frictional force between the handrail 1 and the handrail 1, the speed of the handrail 1 may decrease or stop as described above. If a passenger gets on the escalator in such a state, the speed of the handrail 1 and the steps 2 are not synchronized, resulting in an unstable ride, which may result in a fall or other personal injury.

Therefore, as a method of detecting a decrease in the operating speed of the handrail and stopping the escalator, for example,
As shown in Publication No. 8-16768.

It is known that the operating speed of the handrail 1 is detected by a generator via a detection roller, and the escalator is stopped when the output voltage of the generator is below a certain value.

This method requires rotational torque to rotate the generator, and this torque is given by the contact pressure between the handrail 1 and the detection roller, but it requires a special device that always maintains this contact pressure above a certain level. There is.

[Purpose of the invention]

An object of the present invention is to provide a control device for a passenger conveyor that does not require a special device to detect the speed of the handrail by providing a detection device on the guide roller of the handrail.

[Summary of the invention]

The outline of the present invention is to detect the speed of the handrail by providing an impeller on a guide roller provided on the return path of the handrail, and providing a proximity switch engaged with the impeller with a certain gap. It is.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1, 3, and 4. 10 is a guide roller that guides the handrail 1 on the return path of the handrail, 11 is an impeller provided at the end of the guide roller 10 so as to rotate together with the guide roller 10, and 12 is an impeller with a certain gap between the impeller 11 and the guide roller 10. 14 is a proximity switch provided in engagement with the handrail 1;
13 is a shaft that rotatably holds the guide roller 11.

15 is a bracket that fixes the proximity switch 12, the guide 14, and the shaft 13, respectively, and is further attached to the frame 9;
Nuts 16 to 19 tighten and fix each component.

In such a configuration, the guide roller 10 is rotated by one row of the handrail 1, but since the first impeller 11 and the proximity switch 12 are engaged in a non-contact manner, the rotation for rotating the guide roller 10 is Torque is guide roller 1
It is sufficient that the rotational resistance is 0 or more, and it is very small. Therefore, in the contact between the handrail 1 and the guide roller 10, since the surface of the handrail 1 is made of rubber material and the surface of the guide roller 10 is generally made of iron, plastic, or rubber material, the friction between them is The coefficient is high;
The guide roller 10 can be sufficiently rotated by following the movement of the handrail 1 only by the pressure supporting the own weight of the handrail 1 without requiring any special equipment.

Next, the control method will be explained.

FIG. 5 is a detailed view of the proximity switch 12.

(a) is a plan view, and (b) is a side view. A permanent magnet 12-1 is housed on one side of the U-shape, and a reed switch 12-2 is housed on the other side. Now, inside the shape, it is blocked by the cross impeller 11 made of a copper plate and does not reach the reed switch 12-2, and the reed switch 12-2 is turned off by the spring return force of the reed. Next, when the blade is removed, the lines of magnetic force of the permanent magnet 12-1 act on the reed switch 12-2, the lead of the reed switch 12-2 is magnetized, and the contact is turned on. In this way, the reed switch 12- of the proximity switch 12
2 repeatedly turns ON and OFF by rotating the impeller 11.

FIG. 6 shows a circuit that detects the ON-OFF operation of the proximity switch 12 and detects that the cycle of the ON-OFF operation has become longer or that the ON-OFF operation has stopped. 12-2 on the left side is a reed switch in the proximity switch 12, R1°R2, R3, R4, and R5 are resistors, C1 and C2 are capacitors, and TR8I and TR82 are transistors.

Di and D2 are diodes, COM is a comparator, and A is a coil of a handrail slip detection relay. Each component is connected as shown in the figure. The operation of this circuit will be explained using the time chart of FIG.

Now, if the handrail is moving normally, the impeller 11 will rotate at the predetermined number of revolutions as described above, and the reed switch 1 will rotate.
2-2 repeats ON and OFF at a predetermined period, as shown in the SW section of FIG. When the reed switch 12-2 is turned on, the charge that had been charged in the capacitor C1 is discharged through the route shown in FIG. A charging current flows through the capacitor C1 according to the route shown in FIG. 12, and C1 is charged. This state is shown in item 01 in FIG. Since the charging current 12 is also the base current of the transistor TR8I, when the current 12 is flowing, the transistor TR51 is turned on. When the transistor TR81 is turned on, the charge accumulated in the capacitor C2 is discharged through the route i3.

When the transistor TR81 is turned off, a charging current flows to the capacitor C2 through the i4 route, and charges are stored in the capacitor C2. Therefore, if the handrail is operating normally, the voltage of the capacitor C2 will fluctuate below the reference level, as shown in item C2 of FIG. 7, and will not cause the comparator COM to output.

Next, when the handrail slips and the rotation of the impeller 11 stops or decelerates, the reed switch 12-2
The N or OFF time continues for a long time, and the transistor TR8
The OFF time of I becomes longer, charging of capacitor C2 continues, the voltage of C2 exceeds the reference level of comparator COM, the output of comparator COM becomes high "H", transistor TR82 turns ONL, relay A will turn on. (Slip detection accuracy can be varied by changing the setting of the reference level.) Fig. 8 shows an escalator operating circuit, and U is an electromagnetic contactor that drives the escalator upward.

D is an electromagnetic contactor for downward operation, and when either of these is turned ON by turning on the operation switch UP, S or DN, S (automatic reset type switch), it is held by the self-hold contact Ua or Da. Operate the escalator up or down. Db and Ub are interlock contacts. Contact Ab is a normally closed contact of handrail slip detection relay A shown in Fig. 6, and the contact is closed when the handrail is moving normally.

The escalator continues to operate. Now, when handrail slip occurs and relay A is turned on, contact Ab opens, turning off operation electromagnetic contactor U or D and stopping the escalator.

As explained above, according to the present invention, the operating speed of the handrail can be detected without contact.

There is no need to provide a special device to correctly detect the speed of the handrail.

〔Effect of the invention〕

According to the present invention, when the speed of the handrail of the passenger conveyor falls below a certain value relative to the speed of the steps, that speed can be detected and the operation of the escalator can be stopped, ensuring the safety of passengers. There is an effect that can be done.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the handrail speed detection device according to the present invention, FIG. 2 is a schematic diagram showing the overall structure of the niscalator, and FIG. 3 is an arrow in the direction of A--A in FIG. visual view,
Fig. 4 is a view taken along the arrow B-B in Fig. 1, Fig. 5 is a detailed view of the proximity switch, (a) is a plan view, (b) is a side view, and Fig.
The figure is a slip detection circuit diagram, Figure 7 is a time chart diagram,
FIG. 8 is an operating circuit diagram of the escalator.

Claims (1)

[Claims] 1. In a passenger conveyor equipped with steps arranged in an endless manner and an endless handrail that runs in the same direction and at the same speed as the steps, a guide roller provided on the return path of the handrail is A control device for a passenger conveyor, comprising a detection device for detecting rotation, and means for stopping the operation of the passenger conveyor when the number of rotations of the guide roller becomes less than a certain number of rotations.