JPH101277A - Moving handrail speed abnormality detecting device of passenger conveyer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect positional shifting from a step accumulated caused by lowering of speed of a light moving handrail and also prevent misunderstanding of synchronized lowering of speed. SOLUTION: In a detecting part 7, the output of rotary generators 4a, 4b for detecting the speed of a moving handrail is converted to a speed signal by converting circuits 8a, 8b, the output of a rotary generator for detecting the speed of steps 5 is converted to a speed signal by a converting circuit 9, and the relative speed is calculated by arithmetic circuits 10a, 10b. The amount of time when the current relative speed continues is measured by timers 11a, 11b reset every time the relative speed between the moving handrail and the step changes. The relative speed and the duration are compared with preset values of a detection table 12 by a comparing circuit 13, and if the result agrees with the detection range of the detecting table 12, an output relay 14 is released to stop the operation of the passenger conveyer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a safety device for a passenger conveyor.

[0002]

2. Description of the Related Art In the prior art, as disclosed in Japanese Patent Laid-Open No. 4-191289, the speed of a moving handrail is detected, and the passenger conveyor is stopped when the relative speed between the right and left sides exceeds a specified value.

In the prior art, the abnormality is detected at a single point, and no consideration is given to the case where the speed reduction that does not reach the abnormality detection value continues for a long time, and a slight speed reduction occurs for a long time. There has been a problem that it is not possible to detect that the positions of the moving handrail and the steps are displaced enough to give the passenger a risk of falling.

Further, as disclosed in Japanese Patent Application Laid-Open No. 3-98990, the speed of a moving handrail is detected, an alarm is issued based on the signal, and the passenger conveyor is stopped.

In the prior art, only the speed of the moving handrail is detected, so that no consideration is given to the case where the speed of the moving handrail decreases in synchronization with the steps. Could stop and increase the chances of falling passengers.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to detect an abnormality before a passenger falls over due to a significant shift in the position between the moving handrail and the step when the speed of the moving handrail is slightly reduced for a long time. In addition, there is a need to stop the passenger conveyor, and to prevent a speed abnormality from being erroneously detected when the speed of the moving handrail and the step is reduced in synchronization.

[0007]

In order to achieve the first object of the present invention, the present invention provides a moving handrail speed abnormality detecting device which stores in advance a relative speed and duration of a moving handrail and a step to determine a speed abnormality in a detection value table. Set and compare the measured values of the relative speed and duration of the moving handrail and step.

[0008] In order to achieve the second object of the present invention, a speed detector is provided in a driving unit of a moving handrail and a step, and a relative speed between the moving handrail and the step is calculated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1, 2, 3 and 4. FIG. FIG. 1 is a block diagram showing the arrangement of the moving handrail speed abnormality detecting device.

The tachometer generators 4a and 4b are mounted inside the left and right moving handrails 1 on the return side, and the tachometer generator 5 is mounted on the shaft of the step driving gear 2.

A control unit 6 is installed in the machine room of the passenger conveyor, and the moving speed of the moving handrail 1 and the speed of the steps 3 are taken into the control unit 6.

FIG. 2 shows a block diagram of the moving handrail speed abnormality detecting device. The control unit 6 of the moving handrail speed abnormality detecting device incorporates the detection unit 7, the output relay 14, and its a contact 14a, and the output relay 14 is configured to be activated when power is supplied to the control unit 6.

The detecting section 7 uses conversion circuits 8a and 8b to convert the outputs of the tachometer generators 4a and 4b for detecting the speed of the moving handrail 1 and the output of the tachometer generator 5 for detecting the speed of the steps 3 using a conversion circuit 9. The signal is converted into a speed signal, and the arithmetic circuits 10a and 10b calculate the relative speed between the moving handrail 1 and the step 3. Timers 11a and 11b that reset each time the relative speed between the moving handrail 1 and the steps 3 change measure the time during which the current relative speed continues. The relative speed and duration are compared with the values of the detection value table 12 set in advance by the comparison circuit 13, and when the relative speed and duration match the detection range of the detection value table 12, the output relay 14 is released.

FIG. 3 shows the configuration of the detection value table 12.
v indicates the relative speed, and t indicates the duration of the relative speed. t1 is the relative speed continuation time of the erroneous detection prevention, v1 is the relative speed at which the abnormality is unconditionally detected after the lapse of the erroneous detection prevention time, and v2 is the relative speed at the lower limit of the detection range.

FIG. 4 shows a control circuit of the passenger conveyor. Start switch UP for ascending operation when the passenger conveyor is normal
Or, when the start switch DN for lowering operation is operated,
Since the relative speed between the moving handrail 1 and the step 3 is smaller than the relative speed v2 at the lower limit of the detection range, the a contact 14a is closed. For this reason, the ascending operation relay 16 is activated during the ascending operation, and the descending operation relay 17 is activated during the descending operation.
Or, it is held at 17a. When the speed of the moving handrail 1 decreases without being synchronized with the speed of the steps 3, the relative speed between the moving handrail 1 and the steps 3 increases.

When this state continues for a certain time and coincides with the detection range set in the detection value table 12, the contact a is released, the ascending operation relay 16 or the descending operation relay 17 is released, and the passenger conveyor stops operating.

[0017]

According to the present invention, when a slight decrease in the speed of the moving handrail occurs for a long time, an abnormality is detected before the position of the moving handrail and the step greatly deviates and the passenger falls, and the moving is performed. When the speed of the handrail and the steps are reduced in synchronization with each other, the speed abnormality is not erroneously detected, so that an accurate and highly safe moving handrail speed abnormality detection device can be provided.

[Brief description of the drawings]

FIG. 1 is a side view of a moving handrail speed abnormality detecting device.

FIG. 2 is a block diagram of a moving handrail speed abnormality detecting device.

FIG. 3 is an explanatory diagram of a detection value table.

FIG. 4 is a control circuit diagram of a passenger conveyor.

[Explanation of symbols]

4a, 4b, 5 ... tachometer generator, 6 ... control unit, 7 ... detection unit, 8a, 8b, 9 ... conversion circuit, 10a, 10b ... operation circuit, 11a, 11b ... timer, 12 ... detection value table, 13 ... comparison circuit, 14 ... output relay, 14a ... a contact.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takatoshi Nemoto 1070 Ma, Hitachinaka City, Ibaraki Prefecture Inside Mito Plant, Hitachi, Ltd. (72) Inventor Tadashi Takahashi 832 Horiguchi 832 Horiguchi, Hitachinaka City, Ibaraki Prefecture Inside the corporation

Claims (2)

[Claims] 1. A moving speed of left and right moving handrails on a passenger conveyor including a step that is connected endlessly and moves, a moving handrail that moves in synchronization with the step, and a balustrade that supports the moving handrail. Equipped with a moving handrail speed detecting device for detecting the moving speed of the step, and a stepping speed detecting device for detecting the moving speed of the step, detecting the detected value of the left and right moving handrail speed detecting device and detecting the moving speed of the step. Comparing the detected values of the apparatus, and stopping the passenger conveyor when a state in which a difference between the detected value of the moving handrail speed and the detected value of the step moving speed is equal to or more than a predetermined value continues for a predetermined time or more. Conveyor moving handrail speed abnormality detection device. 2. The apparatus according to claim 1, further comprising a plurality of speed abnormality detection values and a set value of the speed abnormality continuation time, wherein a difference between the detection value of the moving handrail speed and the detection value of the step moving speed and the continuation time thereof. A moving handrail speed detecting apparatus for a passenger conveyor, which stops the passenger conveyor when any of the detected speed abnormalities of the moving handrail speed detecting apparatus matches one of the set values of the speed abnormal duration.