JP3173917B2 - Chain tension adjustment tool for handrail drive mechanism - Google Patents

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 tool used for adjusting a drive chain to an appropriate tension in a handrail driving mechanism of a passenger conveyor such as an escalator.

[0002]

2. Description of the Related Art Conventionally, devices used for adjusting the tension of a drive chain of a handrail drive mechanism have been disclosed in Japanese Utility Model Laid-Open Publication No. 62-150479 and Japanese Utility Model Laid-Open Publication No.
As described in JP-A-81-81, JP-A-62-47591, etc., a tool for applying a rotational force to a drive roller that directly drives a handrail is known. If the drive chain slacks around the idle sprocket by rotating,
To eliminate the slack, loosen the fixing bolt of the sprocket support movably fixed to the base to change the mounting position of the idle sprocket, and finally, to a position where the drive chain can be maintained at the appropriate tension. Tension was adjusted by moving the idle sprocket and fixing the sprocket support to the base.

[0003]

However, the above-mentioned tension adjusting operation involves several operations of changing the mounting position of the idle sprocket while rotating the drive roller to cause slack in the handrail drive chain. If not repeated, the drive chain cannot be set to an appropriate tension, and there is a problem that the adjustment operation cannot be performed quickly. In other words, when the drive roller is rotated to slack the drive chain around the idle sprocket, the drive chain loses tension even between the sprocket of the drive roller and the idle sprocket and loosens there. Even if the slack around the idle sprocket is eliminated by moving, the above-mentioned slack is not eliminated, and when the application of the rotational force to the drive roller is stopped, the slack is dispersed throughout the drive chain to lower the tension. Therefore, in order to set the drive chain to an appropriate tension over the entire length, the operation of changing the mounting position of the idle sprocket while continuously applying the rotational force to the drive roller must be repeated several times. In addition, in order to drive the drive chain to slack around the idle sprocket, a considerably large rotational force must be applied to the drive roller. Therefore, a large amount of labor is required for adjustment work, and improvement thereof has been desired.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the prior art described above, and has as its object to provide a chain of a handrail drive mechanism capable of easily and quickly adjusting the tension of a drive chain for a handrail of a passenger conveyor. It is to provide a tension adjusting tool.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a plurality of sets of drive and driven rollers for sandwiching a handrail from the front and back, a base as a mounting plate, and movably fixed to the base. Idle sprocket rotatably supported by the sprocket support, a double sprocket rotatably supported by the base and transmitting the driving force of the main chain, a sprocket of the plurality of drive rollers, and the idle sprocket And a drive chain wound around the double sprocket endlessly, wherein the plurality of drive rollers driven by the drive chain drive the handrail. engaging portion for engagement, in order to face the outer wall surface of the base Walls, and the base of the back
Traction bracket attachable to the base has a folded portion for facing the side, are screwed to the vertical wall portion of the towing bracket and a depressible jack bolt the base of the outer wall surface, the jacking bolt the direction of reaction force received from said base, said sprocket support is achieved by setting the orientation you away from the drive roller.

[0006]

[Action] chain tension adjusting tool with the above-described traction bracket and the jack bolt, upon tensioning of the drive chain for the handrail to engage the sprocket support idle sprocket engaging portion of the traction bracket, the folding
Since the return portion is arranged on the back surface side of the base and the jack bolt screwed to the upright wall portion is in contact with the outer wall surface of the base, the traction fitting can be attached to the base,
After loosening the fixing bolt of the sprocket support, if the jack bolt is screwed in and the outer wall of the base is pressed, the sprocket support can be moved away from the drive roller by the reaction force received from this outer wall, Therefore, the idle sprocket can be moved in a direction in which the tension of the drive chain increases without causing local slack in the drive chain. Then, when the idle sprocket is moved to a position where the drive chain can be maintained at an appropriate tension, if the sprocket support is fixed to the base by tightening the fixing bolt, the drive chain can be removed from the base even if the adjusting tool is removed from the base. Since the tension does not change, it is possible to set an appropriate tension by one adjustment operation.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One 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 tool as an embodiment is mounted on a base of a handrail driving mechanism, FIG. 2 is a side view of the adjusting tool shown in FIG. 1, and FIG. It is explanatory drawing which shows a schematic structure.

[0008] The handrail drive mechanism of the passenger conveyor includes:
As shown in FIG. 3, a plurality of sets of a driving roller 2 and a driven roller 3 that sandwich the handrail 1 from the front and back directions, a base 4 as a mounting plate, and a sprocket support 5a movably fixed to the base 4 are provided. An idle sprocket 5 rotatably supported, a double sprocket 6 rotatably supported on the base 4, and an endless loop around the sprocket 2a, the idle sprocket 5, and the double sprocket 6 of each drive roller 2. Drive chain 7, an intermediate sprocket 8, a tension chain 9 wound around the intermediate sprocket 8 and the double sprocket 6 endlessly, and a sprocket 10 of a terminal gear supporting a step running chain (not shown).
And an intermediate sprocket 8 and an endless main chain 11 and the like. Since the driving force of the main chain 11 driven by the sprocket 10 of the terminal gear is transmitted to the double sprocket 6 via the tension chain 9, the drive chain 7 driven by the double sprocket 6 , So that the handrail 1 sandwiched between the driving roller 2 and the driven roller 3 is driven to travel. Each drive roller 2 is supported so as to be movable in a direction perpendicular to the traveling direction of the handrail 1.

A chain tension adjusting tool 12 for adjusting the tension of the drive chain 7 in such a handrail driving mechanism is provided with an engaging portion for engaging with the sprocket support 5a, as is apparent from FIGS. A tow fitting 13 having a standing wall portion 13b which is opposed to the outer wall surface 4a of the base 4 and which can be attached to the base 4, and an outer portion of the base 4 which is screwed to the standing wall portion 13b of the towing metal member 13 and A jack bolt 14 capable of pressing the wall surface 4a, a nut 15 for fixing the jack bolt 14, a plate 16 for filling a gap between the folded portion 13c of the traction fitting 13 and the base 4, and a portion facing the plate 16. And a guide bolt 17 screwed to the traction fitting 13. That is, the adjustment tool 12 is
a is engaged with the sprocket support 5a, and
Is opposed to the outer wall surface 4a of the base 4, and the tip of the jack bolt 14 is brought into contact with the outer wall surface 4a.
3 can be mounted on the base 4, and when the jack bolt 14 is screwed in this state, the traction fitting 13 receives a downward reaction force from the base 4 in FIGS.

Therefore, when the tension of the drive chain 7 is adjusted, the adjusting tool 12 is moved to the base 4 as described above.
After setting the distance between the surface of the plate 16 and the tip of the guide bolt 17 equal to the thickness of the base 4,
The sprocket support 5a can be moved by loosening the fixing bolt 18 that fixes the sprocket support 5a to the base 4, and in this state, the jack bolt 14 is turned to press the outer wall surface 4a of the base 4, and the sprocket support 5a is moved outward. By the reaction force received from the wall surface 4a, the sprocket support 5a locked to the engaging portion 13a of the traction fitting 13 can be moved downward in FIGS. 1 and 2, that is, in a direction away from the drive roller 2 group. Therefore, the idle sprocket 5 supported by the sprocket support 5a can be moved to the drive chain 7 without causing local slack in the drive chain 7.
When the tension of the drive chain 7 becomes appropriate, the fixing bolt 18 is tightened to fix the sprocket support 5a to the base 4 again. Complete.

When the adjusting tool 12 is to be removed from the base 4, the jack bolt 14 is loosened and the towing metal fitting 1 is removed.
Although the drive chain 7 is pulled out from the base 4 even during the tension adjustment, the tension of the chain 7 does not change even if the adjustment tool 12 is removed after the tension adjustment. Therefore, the drive chain 7 can be set to an appropriate tension by one adjustment operation.

As described above, when the adjustment tool 12 is used, 1
Since the drive chain 7 can be set to an appropriate tension over the entire length by a single adjustment operation, the operation time can be greatly reduced. In addition, since the adjustment work performed by using the adjustment tool 12 is to screw the jack bolt 14 while checking the tension of the drive chain 7, the tension adjustment work is performed while rotating the drive roller 2 with a tool. Labor can be significantly reduced compared to technology.

[0013]

As described above, in the chain tension adjusting tool according to the present invention, the engaging portion of the traction fitting mounted on the base of the drive mechanism for the handrail is engaged with the sprocket support of the idle sprocket, and the folded portion is formed. Behind the base
The sprocket support can be moved in the direction away from the drive roller by the reaction force received from the outer wall surface by pressing the outer wall surface of the base with the jack bolt by disposing the sprocket support on the outer side of the base. The idle sprocket can be moved in a direction in which the tension of the chain increases without causing excessive slack, so that even if the adjusting tool is removed from the base after the tension adjusting operation is completed, the drive chain does not change its tension. In addition, the chain can be set to an appropriate tension with a single adjustment operation, and since the jack bolts are simply screwed in toward the outer wall of the base, the work of adjusting the tension can be reduced. It has an excellent effect that it can be performed easily and quickly.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which a chain tension adjusting tool according to an embodiment is mounted on a base of a handrail driving mechanism.

FIG. 2 is a side view of the adjustment tool shown in FIG.

FIG. 3 is an explanatory diagram illustrating a schematic configuration of a handrail drive mechanism.

[Description of Signs] 1 Handrail 2 Drive roller 3 Follower roller 4 Base 4a Outer wall surface 5 Idle sprocket 5a Sprocket support 6 Double sprocket 7 Drive chain 8 Intermediate sprocket 9 Tension chain 11 Main chain 12 Chain tension adjustment tool 13 Tow fitting 13a Joint 13b Standing wall 14 Jack bolt

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-132092 (JP, A) JP-A-5-124786 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B66B 21/00-31/02

Claims (2)

(57) [Claims] 1. A plurality of sets of drive and driven rollers for sandwiching a handrail from the front and back, a base as an attachment plate, and a sprocket support movably fixed to the base for pivotal support. An idle sprocket; a double sprocket rotatably supported by the base to transmit the driving force of the main chain; and a sprocket of the plurality of drive rollers, the idle sprocket, and the endlessly wound around the double sprocket. A drive chain, wherein the plurality of drive rollers driven by the drive chain drive the handrail, wherein an engaging portion for engaging with the sprocket support, an outer portion of the base. upright wall portion for facing the wall surface, and the base
Graphics and towing bracket attachable to the folded portion the base <br/> over scan has to be opposed to the back side of, can press the outer wall surface of the screwed to the vertical wall portion of the towing bracket and the base a a jack bolt, the orientation of the reaction force which the jack bolt receives from the base, chain tension of the handrail drive mechanism which the sprocket support is characterized in that it is set in the direction you away from the drive roller Adjustment tool. 2. The traction device according to claim 1, wherein
Attached to the folded part, the folded part and the base
Plate to fill the gap with
Screw to the traction fitting part facing the plate on the surface side
And a guide bolt provided with
Chain tension adjustment tool for the trail drive mechanism.