JPS6261506B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a moving handrail drive device for a passenger conveyor, and particularly to a moving handrail drive device with good drive performance.

[Conventional technology]

Generally, passenger conveyors such as escalators are
In order to transport passengers safely, there are moving handrails that operate at a synchronized speed with the moving steps. For this reason, a device for driving the moving handrail is required, and conventional moving handrail driving devices are constructed as shown in FIGS. 1 to 3.

That is, an endless moving step S is mounted on the main body frame 1 of the escalator, and an endless moving handrail 3 supported by a parapet 2 is arranged along the moving step S. The movable handrail 3 is held between a driving roller 4 and a driven roller 5 below the parapet 2. The driving roller 4 is connected to the moving handrail 3
A shaft 7 placed on top and fixed to the movable support frame 6
It is rotatably supported by. Drive roller 4
A sprocket 9 is fixed to the sprocket 9, and a chain 10 is wound around the sprocket 9.
Further, this chain 10 is wound around a double sprocket 11 that is pivotally supported on the same movable support frame 6, and is further connected to a drive motor 13 from this double sprocket 11.
A chain 12 is wound around it. On the other hand, the driven roller 5 faces the driving roller 4 and holds the moving handrail 3 from below, and the main body frame 1
It is rotatably supported by a fixed support frame 14 fixed to. The movable support frame 6 is locked to the fixed support frame 14 so that the drive roller 4 can move only in the direction in which the movable handrail 3 is pressed. That is, a pin 15A extending in the pressing direction is projected from the fixed support frame 14, and a seat 15B for slidingly supporting the pin 15A is projected and engaged with the movable support frame 6. Here, reference numeral 17 denotes an idler sprocket rotatably provided on the movable support frame 6, in order to drive the plurality of drive rollers 4, and to ensure the winding angle of the chain 10 with respect to the sprocket 9 fixed to these. It is provided. With this configuration, when the chain 12 is driven,
The driving force is transmitted to the double sprocket 11 and drives the chain 10 wound around it. As a result, driving force is transmitted to the drive roller 4 via the sprocket 9. Here, the drive roller 4 moves the handrail 3
However, in the structure described above, the tension T due to the driving force of the chain 12 acts on the movable support frame 6 as an external force, so that the movable support frame 6 can be attached to the movable support frame Since the movable handrail 3 is held between the driven roller 4 and the driven roller 5, the necessary frictional force is obtained by this pressing force. Therefore, in the conventional drive structure, the tension T of the chain 12 is set large by selecting the speed increasing ratio of the sprocket on the motor side, the double sprocket 11, and the sprocket 9 fixed to the drive roller 4, and this force is used to increase the tension T of the chain 12. This provided the frictional force that drove the moving handrail.

[Problem that the invention seeks to solve]

In such a conventional structure, the chain tension T described above does not require an excessively large value in a general escalator where the running resistance of the moving handrail is relatively small. This value could be obtained relatively easily, and the chain 12 did not need to have a large capacity. However, if the escalator has a high lifting height of, for example, around 20 m, the running resistance of the moving handrail 3 will be 3 to 4 times greater than that of a general escalator, so in the conventional structure,
The speed increasing ratio of the sprocket must be excessively high, and the tooth ratio of the sprocket will be extremely unbalanced.At the same time, as a result of the above, the tension T will increase, so the chain 12 must have a large capacity. The problem is that the sprocket 9 or the twin sprocket 11 on which it is wound has to be large in size, making it uneconomical.

The present invention has been made in view of these points, and its purpose is to economically provide a drive device with high drive capacity.

[Means for Solving the Problems] In the present invention, the chain wound around the sprocket of a drive roller is wound again around the sprocket of another drive roller via an idler sprocket supported on the fixed side. It is.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings of one embodiment. FIG. 4 shows a fifth embodiment of the present invention.
The figure shows the - cross section of FIG. 4. Here, reference numeral 18 denotes a frame body fixed to the fixed support frame 14, and a shaft 19 is attached to this frame, and an idler sprocket 17 is rotatably provided on this shaft.
In this structure, the chain 10 between the sprocket 9 fixed to the drive roller 4 and the idler sprocket 17 has a pin 15A that guides the movable support frame 6.
are placed almost parallel to.

Here, the idler sprocket 17 is provided on the fixed support frame 14, that is, on the fixed side. As a result, sprocket 9 and idler sprocket 17
The tension force T' acting on each chain between the two presses the sprocket 9, that is, the drive roller 4, downward with the force T'. In addition, two reciprocating chains 10 are wound between the idler sprocket 17 and the sprocket 9, and the tension is the same.
Because of T', the drive roller 4 is pushed down by a force of 2T'.

In this structure, the tension acting on the chain 10
T' is no different from the conventional structure, so the strength of the chain can be the same as before, and the tension of chain 10 for one idler sprocket is
A pressing force twice that of T' can be obtained. Also chain 1
2 and the chain 10 are almost the same, so in the conventional structure, the pushing force was only due to the tension T of the chain 12, but by providing one idler sprocket 17 of the present invention, the pushing force is about three times as much. You can easily get pressure. As a result, the driving capacity can be increased in proportion.

In this embodiment, one idler sprocket 17 on the fixed side has been described, but it is of course possible to provide a plurality of idler sprockets 17 to further increase the driving capacity.

〔Effect of the invention〕

According to the present invention, the tension of the chain 10 remains the same and the strength of the idler sprocket 17 can be made exactly the same as before, so it is possible to obtain a moving handrail drive device having an economically large driving capacity.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the overall structure of a passenger conveyor, Fig. 2 is a front view showing a conventional moving handrail drive device, Fig. 3 is a sectional view taken from Fig. 2, and Fig. 4 is an embodiment of the present invention. FIG. 5 is a front view showing an example of a moving handrail drive device, and FIG. 5 is a cross-sectional view taken from FIG. 4. 1... Frame body frame, 3... Movable handrail, 4...
... Drive roller, 5 ... Driven roller, 6 ... Movable support frame, 10 ... Chain, 12 ... Chain, 1
7...Idler sprocket.

Claims (1)

[Claims] 1 A plurality of driven rollers that hold one side of the movable handrail and are pivotally supported by a fixed member, a plurality of drive rollers located on the other side of the movable handrail that opposes this driven roller, and a plurality of drive rollers that are A movable support supported so as to be movable in the thickness direction of the movable handrail, a plurality of sprockets provided coaxially with each of the drive rollers, and a drive sprocket pivotally supported by the movable support; In the movable handrail drive device comprising an endless chain sequentially wound between the drive roller, a coaxial sprocket, and the drive sprocket, a movable support plate is provided on the opposite side of the drive roller and the movable handrail. The idler sprocket is pivotally supported on a fixed member,
A moving handrail drive device for a passenger conveyor, characterized in that an endless chain is wound around a sprocket coaxial with the drive roller, and is again wound around a sprocket coaxial with another drive roller via the idler sprocket.