JP2001139277A - Chain tension adjusting device for handrail drive mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chain tension adjusting device for a handrail drive mechanism, capable of easily and accurately adjusting the tension of a tension chain. SOLUTION: This chain tension adjusting device 12 comprises a bracket 13 fixed to a base 4; an engaging piece 14 movably held to the bracket 13 and engaged with a double sprocket 6; and a towable jack bolt 15 thread- fastened to the engaging piece 14. The chain tension adjusting device 12 is mounted to the handrail drive mechanism when adjusting the tension of a tension chain 9, and the tension of the tension chain 9 is adjusted by towing the double sprocket 6 in the loosened state of a fixing bolt 6a through the engaging piece 14 while rotating the jack bolt 15. Since the tension of the tension chain 9 can be adjusted without inclining the double sprocket 6, workability in adjustment is considerably improved, and accuracy in adjustment is easily heightened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain tension adjusting device for a handrail drive mechanism of a passenger conveyor such as an escalator, and more particularly to a tension adjusting device for a tension chain wound around a double sprocket. The present invention relates to a simple chain tension adjusting device.

[0002]

2. Description of the Related Art In a handrail drive mechanism such as an escalator, a tension chain is wound endlessly between an intermediate sprocket rotatably driven by a main chain and a double sprocket driving a drive chain. Then, when adjusting the tension of the tension chain, with the fixing bolt attaching the double sprocket to the base loosened, and after moving the double sprocket to a position where the tension of the tension chain is appropriate, Generally, a method of fastening a fixing bolt is used.

[0003] Further, as a device used for tension adjustment work of a drive chain or the like, conventionally, a device disclosed in Japanese Utility Model Laid-Open Publication No.
As described in JP-A-79-79, JP-A-61-200881, JP-A-62-47591, etc., a drive roller for directly driving a handrail is forcibly rotated to form a drive chain or the like. Tools capable of causing sagging have been proposed. When the drive roller is rotated with this kind of tool, the drive chain can be slackened around the idle sprocket, so the sprocket support that is movably fixed to the base and rotatably supports the idle sprocket is fixed. The idle sprocket can be moved to a position where the slack is eliminated by loosening the bolt. Therefore, if the idle sprocket is moved to a position where the tension of the drive chain is appropriate, and then the sprocket support is fixed to the base, the tension of the drive chain can be adjusted.

[0004]

As described above, when adjusting the tension of the chain of the handrail driving mechanism, the sprocket around which the chain is wound is moved after the fixing bolts are loosened. After the chain is adjusted to an appropriate tension, the fixing bolt is fastened again. However, if you loosen the nut of the fixing bolt, the sprocket will be in a slightly inclined state,
Even if the tension of the chain is set to an appropriate value in this state, if the inclination of the sprocket is eliminated by tightening the nut, the tension of the chain will change. In particular, since the double sprocket around which the tension chain is wound tends to tilt when the fixing bolt is loosened, conventionally, when adjusting the tension of the tension chain, it is necessary to loosen the fixing bolt and move the double sprocket. The work had to be repeated many times. Therefore, there is a problem that a considerably complicated operation is required to adjust the tension of the tension chain with high accuracy.

The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a chain tension adjusting device for a handrail drive mechanism that can easily and accurately adjust the tension of a tension chain. It is in.

[0006]

In order to achieve the above-mentioned object, the present invention provides a driving roller and a driven roller for sandwiching a handrail from front and back, a base as a mounting plate, and a movable member fixed to the base. An idle sprocket rotatably supported by the sprocket support, a double sprocket rotatably supported by the base via fixing bolts, and a main chain wound around the sprocket of the terminal gear; An intermediate sprocket that is rotationally driven by the main chain, a tension chain that is wound around the intermediate sprocket and the double sprocket endlessly, and a sprocket of the drive roller, the idle sprocket, and the double sprocket endlessly. With a wound drive chain Transmitting a driving force of the main chain to the double sprocket via the intermediate sprocket and the tension chain, thereby driving the handrail via the drive chain and the driving roller. In the handrail drive mechanism, a device mounted when adjusting the tension of the tension chain includes a bracket fixed to the base, an engagement piece movably held by the bracket and capable of engaging with the double sprocket, Engaging piece moving means for moving the engaging piece with respect to the bracket, the engaging piece moving means moving the double sprocket in a state where the fixing bolt is loosened through the engaging piece in the radial direction. Was moved along.

When the apparatus including the bracket, the engagement piece, and the engagement piece moving means is mounted on the handrail drive mechanism at the time of adjusting the tension of the tension chain, the apparatus is mounted on the double sprocket via the engagement piece. Since a force against the tension of the tension chain can be applied, even if the fixing bolt is loosened, the double sprocket hardly tilts. Also, if the engagement piece is appropriately moved with respect to the bracket by the engagement piece moving means,
The double sprocket can be moved to a position where the tension of the tension chain becomes appropriate. Therefore,
If you use this device to loosen the fixing bolt of the double sprocket and adjust the tension of the tension chain,
Even if the fixing bolts are tightened after the adjustment is completed, the tension of the tension chain hardly changes, so that the tension of the tension chain can be adjusted accurately with one operation.

Further, as an engaging piece moving means, a jack bolt which can be pulled by being screwed to the engaging piece is used. The jack bolt is connected to the outer side in the radial direction on the opposite side to the intermediate sprocket side with respect to the double sprocket. In this case, the double sprocket can be pulled straight through the engagement piece, so that the inclination of the double sprocket during the pulling can be prevented, and the tension can be adjusted with higher precision.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a front view showing a state in which a chain tension adjusting device according to the present invention is mounted on a handrail drive mechanism, FIG. 2 is an explanatory view of a main part of FIG. 1 viewed from the side, and FIG. FIG. 3 is an overall configuration diagram of a handrail drive mechanism shown in FIG.

First, a schematic configuration of a handrail driving mechanism of a passenger conveyor according to the embodiment is shown in FIG.
This will be described with reference to FIG. The handrail drive mechanism includes a plurality of sets of drive rollers 2 and driven rollers 3 for sandwiching the handrail 1 from the front and back, a base 4 as a mounting plate, and a sprocket support 5a movably fixed to the base 4. The idle sprocket 5 is rotatably supported on the base 4, the double sprocket 6 is rotatably supported on the base 4 via fixing bolts 6a (see FIG. 2), and the sprocket 10 of the terminal gear. Main chain 11 and this main chain 11
The intermediate sprocket 8 is driven to rotate, the tension chain 9 is wound around the intermediate sprocket 8 and the double sprocket 6 endlessly, and the sprocket 2a, the idle sprocket 5 and the double sprocket 6 of each drive roller 2 are endless. And a drive chain 7 wound around the drive chain 7. When the main chain 11 is driven by rotating the sprocket 10 of the terminal gear, the driving force is transmitted to the double sprocket 6 via the intermediate sprocket 8 and the tension chain 9, so that the drive driven by the double sprocket 6 The chain 7 drives each drive roller 2, so that the handrail 1 sandwiched between the drive roller 2 and the driven roller 3 is driven to travel.

In such a handrail driving mechanism, when it becomes necessary to adjust the tension of the tension chain 9, in this embodiment, a chain tension adjusting device 12 as shown in FIGS. The chain tension adjusting device 12 includes a bracket 13 fixed to the base 4 by a bolt 13a and a temporary fixing device 14 such as a bolt and a nut.
a engagement piece 14 movably attached to the bracket 13 by a, and a jack bolt 15 which can be screwed to one end of the engagement piece 14 and pulled therefrom. The end portion is provided with an engaging portion 14b that can be engaged with the shaft portion of the double sprocket 6. When the chain tension adjusting device 12 is mounted on the handrail drive mechanism, the bracket 13 is fixed to the base 4 and the engaging piece 1
4 is engaged with the shaft of the double sprocket 6, and the jack bolt 15 is
Is located radially outward on the opposite side to the intermediate sprocket 8 side. Therefore, the chain tension adjusting device 12
If the fixing bolt 6a of the double sprocket 6 is loosened after mounting, and the jack piece 15 is rotated to pull the engagement piece 14, the double sprocket 6 will be pulled through the engagement piece 14, so that The tension of the tension chain 9 increases.

That is, such a chain tension adjusting device 1
When the tension of the tension chain 9 is adjusted by using the hook 2, first, the engaging portion 14 b of the engaging piece 14 is engaged with the shaft portion of the double sprocket 6 through the space between the tension chains 9, and in this state, the bracket 13 is moved. It is fixed to the base 4 by bolts 13a. Next, after the fixing bolt 6a of the double sprocket 6 is loosened, the jack bolt 15 is rotated to pull the engagement piece 14. As a result, the engagement piece 14 moves upward in the drawing with respect to the bracket 13, so that the double sprocket 6 also moves in the same direction via the engagement piece 14, and thus is wound around the double sprocket 6. The tension of the tension chain 9 is gradually increased. Therefore, when the worker has moved the double sprocket 6 to a position where the tension of the tension chain 9 is appropriate, the towing work by the jack bolt 15 is stopped and the loosened fixing bolt 6a is tightened. After confirming the tension of the tension chain 9 again, the chain tension adjusting device 12
To complete the tension adjustment work.

When the chain tension adjusting device 12 is used as described above, a force against the tension of the tension chain 9 can be applied to the double sprocket 6 via the engagement piece 14, so that the fixing bolt 6a is loosened. Also, the double sprocket 6 does not tilt. Further, by rotating the jack bolt 15 and appropriately moving the engagement piece 14 with respect to the bracket 13, the double sprocket 6 can be moved to a position where the tension of the tension chain 9 becomes appropriate. Moreover, since the jack bolt 15 is disposed radially outward of the double sprocket 6 on the side opposite to the intermediate sprocket 8, the double sprocket 6 can be pulled straight. 6 can also be prevented.
Therefore, after attaching the chain tension adjusting device 12,
If the tension adjusting operation of the tension chain 9 is performed as described above with the fixing bolt 6a loosened, there is no danger that the double sprocket 6 will tilt during the operation. The tension of the tension chain 9 hardly changes, so that the tension of the tension chain 9 can be accurately adjusted by one operation.

[0014]

The present invention is embodied in the form described above and has the following effects.

A chain tension adjusting device comprising a bracket, an engagement piece and an engagement piece moving means is mounted on a handrail drive mechanism when adjusting the tension of the tension chain, so that the fixing bolt is loosened. Since the inclination of the double sprocket is less likely to occur, if the tension of the tension chain is adjusted by appropriately moving the double sprocket via the engagement piece, a change in the tension which may be caused when the fixing bolt is fastened can be avoided. Therefore, it is possible to precisely adjust the tension of the tension chain by one operation.

If the jack bolt as the engagement piece moving means is disposed radially outward of the double sprocket on the side opposite to the intermediate sprocket side, the double sprocket is pulled straight through the engagement piece. As a result, it is possible to prevent the tilting of the double sprocket during towing, thereby enabling more accurate tension adjustment.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which a chain tension adjusting device according to the present invention is mounted on a handrail drive mechanism.

FIG. 2 is an explanatory diagram of a main part of FIG. 1 as viewed from a side.

FIG. 3 is an overall configuration diagram of the handrail drive mechanism shown in FIGS.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hand rail 2 Drive roller 3 Follower roller 4 Base 5 Idle sprocket 5a Sprocket support 6 Double sprocket 6a Fixing bolt 7 Drive chain 8 Intermediate sprocket 9 Tension chain 10 Terminal gear sprocket 11 Main chain 12 Chain tension adjuster 13 Bracket 14 Engagement Piece 14a Temporary fastener 14b Engaging part 15 Jack bolt (engaging piece moving means)

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F16H 7/14 F16H 7/14 A

Claims (2)

[Claims] 1. A drive roller and a driven roller for sandwiching a handrail from front and back, a base as a mounting plate, and an idle sprocket rotatably supported by a sprocket support movably fixed to the base. A double sprocket rotatably supported by the base via fixing bolts, a main chain wound around the sprocket of the terminal gear, an intermediate sprocket rotatably driven by the main chain, and the intermediate sprocket. A drive chain wound endlessly around the sprocket of the drive roller, the idle sprocket, and the double sprocket, and a tension chain wound endlessly around the double sprocket. Apply force to the intermediate sprocket And a handrail drive mechanism for a passenger conveyor configured to drive the handrail via the drive chain and the drive roller by transmitting the handrail to the double sprocket via the tension chain. A device attached at the time of adjustment, comprising a bracket fixed to the base, an engagement piece movably held by the bracket and capable of engaging with the double sprocket, and attaching the engagement piece to the bracket. Engaging piece moving means for moving the double sprocket in a state where the fixing bolt is loosened along the radial direction, via the engaging piece. A chain tension adjusting device for a handrail driving mechanism. 2. As the engagement piece moving means, a jack bolt that can be screwed and pulled to the engagement piece is used.
The chain tension adjusting device for a handrail drive mechanism according to claim 1, wherein the jack bolt is disposed radially outward of the double sprocket on a side opposite to the intermediate sprocket.