JPH02193886A - Belt driving device for inclined type conveyor - Google Patents

Abstract

PURPOSE:To make the pressing force of a belt having different running resistances in both ways nearly constant by disposing an idler sprocket between driving rollers closer to the side pulling the belt at the time of lowering operation among driving rollers arranged in line, and winding a chain on each sprocket concentric with each driving roller through this sprocket. CONSTITUTION:An idler sprocket 17 is disposed in a position opposite to between driving rollers 12 closer to the side pulling a hand rail belt 3 at the time of lowering operation among a plurality of arranged driving rollers 12. Hence, the tension of a chain 10 acting between a sprocket 11 and the idler sprocket 17 at the time of raising operation is reduced, and the pressing force of the hand rail belt 3 having different running resistances in both ways is regularly kept nearly constant during the raising and lowering operations.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a belt drive device for an inclined conveyor, and more particularly to a belt drive device for an inclined conveyor in which a belt is driven under pressure by rollers.

[Conventional technology]

Belt drives for inclined conveyors, e.g. escalators
A handrail belt drive device for an inclined type passenger conveyor such as a motor vehicle or an electric road is constructed as shown in FIG. That is, the handrail belt drive device 1 is built into the frame 2,
It is adapted to drive an endless handrail belt 3. 4
are handrails, which are provided in pairs on the left and right to support the handrail belt 3. Further, the driving force is transmitted from the prime mover 5 to the chain gear 6, and from there to the drive device 1 via the left and right chains 7 and idler sprockets 8.

4 and 5 show a handrail belt drive device described in, for example, Japanese Unexamined Patent Publication No. 57-170373, in which the power transmitted by the chain 7 is transmitted to the chain 1o via the idler sprocket 9. A sprocket lla coaxial with the drive roller 12 in which four Nos. 10 are arranged in parallel.
By being wrapped around the lid and idler sprocket 17, each drive roller 12 is rotated.

The driving rollers 12 are provided with driven rollers 14 facing each other.
It has a structure in which the handrail belt 3 is clamped between the two and driven by friction. The driven roller 14 and the idler sprocket 17 are rotatably supported by a fixed frame 15, and the fixed frame 15 is fixedly supported by the frame 2 via a bracket 16. On the other hand, each drive roller 12 is movable in the direction of pressing one handrail belt in order to apply clamping pressure to the handrail belt 3. That is, sprockets lla~lid
Each of the drive rollers 12 coaxially mounted is rotatably attached to a movable plate 13, and the movable plate 13 is driven by a guide pin 20 passing through a boss 18 fixed to this and a boss 19 fixed to a fixed frame 15. , is configured to move only in the vertical direction. Further, the idler sprocket 9 is also rotatably attached below the movable plate 13. Furthermore, the idler sprocket 8 is rotatably attached to the frame 2.

With this configuration, the driving force transmitted to the chain 7 gives rotational force to the idler sprocket 9, and
The tension T pushes the entire movable plate 13 downward via the idler sprocket 9 6 Meanwhile, the driving force transmitted to the chain 10 also applies rotational force to the drive roller 12 , and the idler sprocket 17 is pressed against the fixed frame 15 . Since it is attached, the tension T2 of the chain 10 in this part causes the sprockets llb and 11c to
The entire movable plate 13 is pushed down with a tension of 2T2. Therefore, since the movable plate 13 is movable up and down, the sum of the tension T and the tension 2T2 acts as a force that causes the drive roller 12 to clamp the handrail belt 3 between it and the driven roller 14. . Thereby, the handrail belt 3 is frictionally driven by the drive roller 12.

[Problem to be solved by the invention]

From the above, the total clamping pressure P of the handrail belt drive device with the above configuration is P:T+2T2...(1)
becomes. Further, mechanically, Tz=1/2XTz.

Furthermore, the two sprockets 9 of the idler sprocket 9
If the pitch circle diameters of a and 9b are the same, T s ” T
Therefore, by substituting this into the equation (1) above, the total clamping pressure P becomes P=2T (2).

On the other hand, the relationship between the running resistance R of the handrail belt 3 and the tension Tl of the chain 1o is the diameter of the drive roller 12 and the sprocket 1
If the pitch circle diameter ratio of 1 is 273, then T 1 = 3
/ 2
), the relationship between the total clamping pressure P and the running resistance R of the moving handrail 3 is P=3R (3).

However, if the handrail belt drive device is installed off to one side with respect to the travel path of the handrail belt, that is, if it is installed in the upper part of the escalator as shown in Fig. The running resistance R of the handrail belt 3 differs depending on the time, and is generally 60 to 80% during descending operation as compared to ascending operation. For this reason, the total clamping pressure P was also different between the ascending operation and the descending operation.

A first object of the present invention is to provide a belt drive device for an inclined conveyor that can maintain substantially constant belt clamping pressure during ascending and descending operations.

A second object of the present invention is to provide a belt drive device for a conveyor that can maintain substantially constant clamping pressure on a belt that has different running resistance on the way to and from the belt.

[Means for Solving the Problem] The above object is to arrange an idler sprocket between at least three drive rollers arranged in parallel, the drive roller closer to the side that pulls in the belt during descending operation, and to This is accomplished by wrapping a chain around each sprocket that is coaxial with each drive roller.

[Effect]

With the above configuration, it is possible to reduce the chain tension that acts between the sprocket and the idler sprocket during ascending operation, thereby making it possible to approach the belt clamping pressure during descending operation.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 regarding an escalator handrail belt drive device.

Three pairs of driving rollers 12 and driven rollers 14 that clamp the handrail belt 3 are arranged along the longitudinal direction of the handrail belt, and the driving rollers 12 groups are provided on the movable plate 13 and the driven rollers 14 groups are provided on the fixed frame 15. There is.

Further, an idler sprocket 17 is provided below the movable plate 13 on the fixed frame 16 facing between the drive rollers 12 on the side where the handrail belt 3 is pulled in during descending operation (arrow D side), and the idler sprocket 17 , a sprocket l provided coaxially with the drive roller 14 closer to the arrow D side.
A chain 10 is wound around lb and 11c. The other configurations are the same as the conventional structure.

In such a configuration, if the tension of the chain 7 during descending operation is Ta and the tension of the chain 10 is Tit, then the tension of the chain 1o wound around the idler sprocket 17 is T.
2 is 1 mechanism, Tz = 2/3XTax, so by substituting this into the above equation (1), the total clamp pressure P4 during descending operation
is, Pn=2 XT binding...
・(4) becomes.

In addition, the relationship between the total clamping pressure P during descending operation and the running resistance R4 of the handrail belt 3 is expressed as P a = 3
...(5).

On the other hand, the tension of chain 7 during upward operation (U arrow) is Tu
, if the tension of the chain 10 is Tut, the tension Tz of the chain 10 wound around the idler sprocket 17 is mechanically Tz = 1/3 Total pressure Pu during operation
is P, = 1-X Tu
−(6).

In addition, the relationship between the total clamping pressure Pu and the running resistance Ru of the handrail belt 3 during upward operation is expressed as in the above equation (3) as follows: Pu=2−×Ru...(
7).

However, as mentioned above, the running resistance R4 of the handrail belt 3 during descending operation is generally about 60 to 80% of the running resistance Ru of the handrail belt 3 during upward operation.
Here, on average, Rd=5/7XR, -(8), and if this is substituted into the above equation (5).

becomes. Here, when comparing the above equation (7) and the above equation (9), P a ” P u .
・It can be seen that (10) is obtained.

As explained above, the driving roller 12 and the driven roller 14
There are three sets of idler sprockets 17 between the drive rollers 12 on the side where the handrail belt 3 is pulled in during descending operation.
By providing this, the clamping pressure of the handrail belt 3 during the ascending operation can be made the same as the clamping pressure of the handrail belt 3 during the descending operation.

In this way, the clamping pressure on the handrail belt 3 can be reduced, so that damage to the handrail belt 3 can be prevented. That is, the handrail belt 3 has a predetermined thickness by bonding several layers of materials with adhesive, but if the clamping pressure is large, the adhesive force between the materials will weaken. However, the embodiment of the present invention can prevent damage to the handrail belt 3 by reducing the clamping pressure.

By the way, in the above embodiment, three drive rollers 12 are arranged in parallel, but the present invention can also be applied to a handrail belt drive device having four or five drive rollers arranged in parallel. That is, when four drive rollers are arranged in parallel, an idler sprocket is placed at a position facing each other between an end drive roller and an adjacent drive roller, and a chain is wound around the idler sprocket.
In addition, when five drive rollers are arranged in parallel, an idler sprocket is installed either between the center drive roller and the drive rollers adjacent to it on both sides, or between the end drive roller and the drive rollers adjacent to it. By arranging the handrail belt and wrapping the chain around it, the clamping pressure of the handrail belt can be changed.

Furthermore, although the above embodiment is a handrail belt drive device for an inclined passenger conveyor such as an escalator or an inclined electric road, the present invention can also be applied to a belt drive device for a belt conveyor in which the running resistance of the belt changes depending on the driving direction.

(Effects of the Invention) According to the present invention, there is an effect that the clamping pressure of the belt during the downward operation and during the upward operation can be made almost equal.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of a belt drive device for an inclined conveyor according to the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is a conventional escalator. 4 is an enlarged view of the handrail driving device shown in FIG. 3, and FIG. 5 is a sectional view taken along line BB in FIG. 4. 3... Handrail belt, 7.10... Chain, 11.
... Sprocket coaxial with the drive roller, 12... Drive roller, 13... Movable plate, 14... Followed roller, 15... Fixed frame, 17... Idler sprocket, Fig.

Claims (1)

[Claims] 1. At least three drive rollers disposed on one side of the belt, driven rollers disposed on the other side of the belt at positions facing the drive rollers, and each of the drive rollers. a movable body that pivots and moves in the belt pressing direction, a fixed member that pivots each of the driven rollers, a sprocket that is coaxial with each of the drive rollers, and a fixed member that is located on the driven roller side with respect to the belt. A belt drive device for an inclined conveyor comprising an idler sprocket that is pivotally supported by the idler sprocket, and a chain that is wound around each of the sprockets and the idler sprocket to rotate the drive roller while pressing the belt, the idler sprocket comprising: A belt drive device for an inclined conveyor, characterized in that the belt drive device for an inclined conveyor is installed at a position facing between the drive rollers that are closer to the side where the belt is pulled in during descending operation among the plurality of drive rollers arranged side by side. 2. At least three driving rollers disposed on one side of the belt, driven rollers disposed on the other side of the belt at positions facing the driving rollers, and supporting each of the driving rollers and pressing the belt. a movable body movable in a direction, a fixed member that pivotally supports each of the driven rollers, a sprocket that is coaxial with each of the drive rollers, and an idler that is located on the driven roller side with respect to the belt and that is pivotally supported by the fixed member. A belt drive device for an inclined conveyor comprising a sprocket and a chain that is wound around each of the sprockets and the idler sprocket and rotates the driving roller while pressing the belt against the belt, wherein the idler sprocket is driven by the plurality of idler sprockets arranged in a row. A belt drive device for an inclined conveyor, characterized in that the belt drive device for an inclined conveyor is installed at a position facing between drive rollers closer to the side from which the belt is sent out during upward operation of the rollers. 3. In a handrail belt drive device for an inclined passenger conveyor, in which a handrail belt is held between at least three drive rollers and the same number of driven rollers as the drive rollers, and the drive rollers are rotated while being pressed against the handrail belt side. A handrail belt drive device for an inclined passenger conveyor, characterized in that the clamping pressure of the handrail belt during ascending operation and descending operation is made almost constant. 4. Three drive rollers arranged along the longitudinal direction of the handrail belt on one side of the handrail belt, driven rollers respectively arranged at positions facing the drive rollers on the other side of the handrail belt, and each of the above-mentioned driven rollers. a movable body that pivotally supports the drive roller and is movable in the handrail belt pressing direction; a fixed member that pivotally supports each of the driven rollers; a sprocket that is coaxial with each of the drive rollers; A handrail belt drive for an inclined passenger conveyor, comprising an idler sprocket positioned and pivotally supported by a fixed member, and a chain that is wound around each of the sprockets and the idler sprocket to rotate the drive roller while pressing it onto the handrail belt. A handrail belt drive for an inclined passenger conveyor, characterized in that the idler sprocket is installed at a position facing between the three drive rollers that are the ones that pull in the handrail belt during descending operation. Device. 5. The belt is held between a belt having different running resistances for going and returning, at least three driving rollers arranged along the longitudinal direction of this belt, and the same number of driven rollers as these driving rollers, and the driving An idler sprocket in which a chain is wound between the drive roller and a coaxial sprocket in order to press the drive roller toward the belt in a conveyor belt drive device that rotates the roller while pressing it toward the belt. A belt drive device for a conveyor, characterized in that: is positioned between drive rollers that are deviated toward a side that pulls in the belt during operation when the running resistance of the belt is small.