JPH0881026A - Friction plate structure of accumulating roller conveyor - Google Patents

Abstract

PURPOSE: To enable stable conveyance with a required minimum of frictional force. CONSTITUTION: In an accumulating roller conveyor 1 constituted in such a way as to press the end face of a carrier roller 3 to the end face of a driving side sprocket 11 so as to transmit conveying force to the carrier roller 3 through frictional force between both of them, a first friction plate 16 is mounted on the end face of the carrier roller 3, and a second friction plate 18 is mounted on the end face of the sprocket 11. One friction plate 18 is formed of a resin plate with slidableness and flexibility in the plate thickness direction, while the other friction plate 16 is formed of a metal plate, and the back faces of both friction plates 18, 16 are received by spacers 17, 15 respectively having elasticity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generates the frictional force in an accumulating roller conveyor capable of rotating a conveying roller by utilizing a frictional force and stopping a conveyed object at a predetermined position. For the structure of the friction plate for.

[0002]

2. Description of the Related Art Generally, the above-mentioned accumulating roller conveyor (hereinafter, simply referred to as "conveyor") is rotated by a frictional force with respect to each of a large number of conveying rollers arranged at a constant interval on a conveying surface. Torque (conveyance force) is applied, the conveyance roller is rotated with a specified frictional force to convey the conveyance object, and when the conveyance object is stopped by operating a stopper etc., rotation resistance acts on the conveyance roller to cause friction. It is configured to cause slippage on the surface to block the transmission of rotational torque to the conveyor roller.Usually, the above frictional force presses the end surface of the conveyor roller against the end surface of the sprocket on the chain drive side by the spring force. It is designed to be generated by.

In such a conveyor, since the combination of the friction surface between the sprocket and the end surface of the carrying roller is conventionally hard resin and metal or hard resin, the flatness of the friction plate as a component or the friction after assembly is required. There is a problem in that the conveyance force to be transmitted varies due to the inclination between the plates and the change (decrease) in the effective radius of the friction plates due to uneven wear. In order to solve this problem, conventionally, in order to give a transporting force above a certain level to all the transporting rollers, the pressing force of the transporting roller against the sprocket, that is, the above spring force is preliminarily estimated in consideration of the variation in the transporting force of each transporting roller. It was set strongly.

[0004]

However, if a strong setting is made in advance as described above, when the conveyed product is stopped by the stopper, the conveyed product is pressed against the stopper with an unnecessarily strong force. For example, if the object is a cardboard box or the like that has no rigidity, the object is deformed, or if the object is an object having an unstable shape, a stopper is run up.

The present invention has been made in view of the above conventional problems, and provides a friction plate structure of an accumulating roller conveyor which can transmit a uniform and stable conveying force by setting a spring force to a necessary minimum. The purpose is to do.

[0006]

Therefore, according to the first aspect of the invention, the end surface of the conveying roller is pressed against the end surface of the sprocket on the driving side, and the conveying force is transmitted to the conveying roller via the frictional force between the two. In the accumulation rate roller conveyor, a structure of a first friction plate mounted on an end surface of the conveying roller and a second friction plate mounted on an end surface of the sprocket, wherein at least one friction plate is arranged in a plate thickness direction. It is characterized in that the resin plate has flexibility.

According to a second aspect of the present invention, there is provided an accumulation rate roller conveyor, wherein the end surface of the conveying roller is pressed against the end surface of the sprocket on the driving side, and the conveying force is transmitted to the conveying roller via a frictional force between them. A structure of a first friction plate mounted on the end surface of the transport roller and a second friction plate mounted on the end surface of the sprocket, one friction plate being a resin having slidability and flexibility in the plate thickness direction. The second friction plate is a metal plate, and the back faces of both friction plates are received by elastic spacers.

According to a third aspect of the invention, the first friction plate mounted on the end surface of the conveying roller is made of a stainless steel plate,
While the back surface of the first friction plate is received by a felt as a spacer, the second friction plate mounted on the end face of the sprocket uses a sliding bearing material containing tetrafluoroethylene resin as a main component. It is characterized in that the back surface is received by elastic rubber as a spacer.

[0009]

According to the structure of claim 1, the conveying roller is
It rotates due to the friction generated between the first friction plate and the second friction plate. At least one of the first friction plate and the second friction plate has flexibility in the plate thickness direction. Therefore, when pressed by the other friction plate, it deforms following the other friction plate. From this, for example, when the axis of the one friction plate and the axis of the other friction plate do not match or are not parallel, that is, both friction plates are inclined with respect to each other due to processing error or assembly error. Even when the friction plates are pressed against each other, one of the friction plates is deformed by being pressed against each other and comes into contact with the other friction plate (centering function). Since both friction plates are in contact with each other, the pressing force acts evenly on the friction surface, and therefore both friction plates generate the friction force almost as set. From this, it is not necessary to press the friction plate with excessive force in anticipation of the shortage because the friction force as set can not be obtained as in the past, and the minimum pressing force is sufficient. Trouble that damages things does not occur.

Further, since both friction plates come into contact with each other, uneven wear does not occur. Therefore, the effective radius of the friction plates, that is, the range of the portions abutting against each other does not decrease with long-term use, and the long wear does not occur. A stable friction force and thus a conveying force are maintained over a period of time.

According to the second aspect of the present invention, since the back surfaces of the first friction plate and the second friction plate are respectively received by the elastic spacers, the aligning function is further enhanced.

According to the third aspect of the present invention, the conveying roller is rotated by the friction between the stainless steel plate as the first friction plate and the sliding bearing member as the second friction plate. Is received by a felt as a spacer, and the back surface of the plain bearing material is received by an elastic rubber as a spacer. Also with this configuration, the mutual inclination of the first friction plate and the second friction plate is absorbed, so that both friction plates come into contact with each other, and therefore a stable conveying force is obtained without depending on the processing accuracy or assembly accuracy. Can communicate. Further, since the stainless steel plate as the first friction plate is received by the felt material, it is possible to prevent the oil content adhering to the first friction plate and the like from being absorbed by the felt material and the oil content adhering to the friction surface.

[0013]

According to the first aspect of the present invention, the first friction plate and the second friction plate are pressed against each other in a face-to-face contact with each other even if the processing precision or the mounting precision of the friction plates varies. The pressing force does not have to be set to be strong in advance as in the conventional case, but can be set to the minimum necessary, and therefore, there is no trouble such as damage to the conveyed object at the time of the accumulation rate unlike the conventional case. .

Further, since the first and second friction plates contact each other, it is possible to maintain a stable carrying force for a long period of time between the carrying rollers or between the conveyors without variations.

According to the second aspect of the present invention, the aligning function can be further enhanced and a reliable surface contact state can be realized.

According to the third aspect of the invention, in addition to the above effects, it is possible to prevent the oil content from adhering to the friction surface.

[0017]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows an accumulating roller conveyor 1 to which the friction plate structure of this example is applied. The conveyor 1 includes two frames 2 and 2 arranged in parallel with each other on the left and right sides in the figure with a constant interval, and both frames 2 and 2
It is mainly composed of a large number of conveying rollers 3 to 3 which are supported by being spanned at appropriate intervals in the conveying direction.

That is, a support shaft 5 is suspended and supported between the brackets 2a, 2a respectively provided on both the frames 2, 2, and the transport roller 3 having a substantially cylindrical shape is supported via the support shaft 5. It is supported between both frames 2 and 2. The support shaft 5 is supported by both brackets 2a, 2a so as to be movable in the axial direction. However, since a retaining ring 5b is attached to the left end portion of the support shaft 5 and is urged to the right in the figure by a compression coil spring 10 described later, the support shaft 5 is always between the frames 2 and 2. Is supported so as to be immovable in the axial direction. The set holes 5d for fitting the retaining ring 5b are formed at three positions at appropriate intervals in the axial direction.
By selecting one of d-5d and changing the position of the retaining ring 5b, the position of the support shaft 5 in the axial direction is changed, and by extension, the biasing force of the compression coil spring 10 is changed to change the conveying roller. It is possible to adjust the conveyance force that 3 can exhibit. This will be further described later.

Bearing cases 8 and 9 are fitted and fixed on the inner peripheral sides of both ends of the conveying roller 3, and bearings 6 and 7 are mounted on the inner peripheral sides of both bearing cases 8 and 9, respectively. The conveyance roller 3 is supported by the support shaft 5 via 6 and 7 so as to be rotatable and axially movable.

A ring 5a is attached to a substantially axial center of the support shaft 5 by a snap ring 5c so as to be immovable axially rightward. The ring 5a and the bearing 6 on the left side in the drawing are compressed as described above. The coil spring 10 is interposed in a compressed state. As described above, this compression coil spring 1
Although the support shaft 5 is urged to the right in the figure by 0, the retaining ring 5b is provided at the left end of the support shaft 5.
Is attached to the support shaft 5 so that the support shaft 5 cannot move to the right in the figure, and as a result, the bearing 6, that is, the transport roller 3 is urged to the left in the figure. By biasing the transport roller 3 to the left in the figure in this manner, the left end surface of the transport roller 3, that is, the left end surface of the bearing case 8 is pressed against the sprocket 11.

The sprocket 11 is rotatably supported via a bearing 12 on the left side of the conveying roller 3 in the figure and near the left end of the support shaft 5. Since the collar 13 is interposed between the bearing 12 and the bracket, the sprocket 11 is fixed immovably in the axial direction. However, the support shaft 5 is movable in the axial direction with respect to the sprocket 11.
As a result, when the carrying force is adjusted as described above, only the support shaft 5 is moved in the axial direction without moving the sprocket 11.

A drive mechanism for positively rotating the carrying roller 3 is interposed between the frame 2 on the left side of the drawing and the carrying roller 3. That is, an endless chain 4 is rotatably stretched over the frame 2 along its longitudinal direction (direction orthogonal to the drawing), and the sprocket 11 is meshed with the chain 4. Then, when a drive motor (not shown) is activated, the chain 4 rotates, which causes the sprocket 11 to rotate.

The rotation of the sprocket 11 is transmitted to the conveying roller 3 by the frictional force between the sprocket 11 and the bearing case 8. That is, as shown in FIG. 2, the left end surface of the bearing case 8 is
While the first friction plate 16 is attached with the spacer 15 interposed therebetween, the second friction plate 18 is attached to the right end surface of the sprocket 11 with the spacer 17 interposed therebetween, and the conveyance roller 3 is attached by the compression coil spring 10. By being biased to the left in the figure, the first friction plate 1 is attached to the second friction plate 18.
6 is pressed.

The spacer 15 on the side of the conveying roller 3 is formed of felt as a ring and has an appropriate elasticity in the plate thickness direction (the pressing direction of the first friction plate 16). The spacer 15 is bonded to the left end surface of the bearing case 8. The first friction plate 16 is formed by forming a stainless steel plate into a ring shape having the same size as the spacer 15, and is adhered to the spacer 15 and fixed in an overlapping shape.

On the other hand, the spacer 17 on the sprocket 11 side
Is a ring-shaped rubber plate having an appropriate elasticity. The surface of the spacer 17 (right side in the drawing)
A sliding bearing material serving as the second friction plate 18 is attached to this by vulcanization adhesion. This sliding bearing material is a commercially available sliding bearing material containing tetrafluoroethylene resin (PTFE) as a main component and formed into a thin ring shape, and has an appropriate friction coefficient and wear resistance. are doing. Moreover,
Since the second friction plate 18 is thin and the back side is received by the elastic rubber (spacer 17), it has flexibility in the plate thickness direction. The second friction plate 18 is fixed in a state of facing the first friction plate 16 by attaching the spacer 17 to the right end surface of the sprocket 11.

According to the friction plate structure of the present embodiment configured as described above, the conveying roller 3 is biased toward the sprocket 11 side by the compression coil spring 10 and the first friction plate 16 becomes the second friction plate on the sprocket 11 side. It is pressed against 18, and by the frictional force between both friction plates 16 and 18 due to this pressing force,
When the sprocket 11 on the drive side rotates, the conveyor roller 3 rotates, thereby conveying the conveyed object.

When a stopper or the like acts on the conveyed object to prevent the conveyance, the conveying roller 3 receives rotational resistance, and therefore the first friction plate 16 having a smaller frictional force than that between the conveyed object and the conveying roller 3. Sliding occurs with the second friction plate 18. Then, the sprocket 11 idles and the carrying force is cut off,
The conveyor 1 is in the accumulation rate state. When the movement-prevented state of the conveyed object is released, the rotation resistance of the conveying roller 3 is removed, so that the conveyed roller 3 rotates again together with the sprocket 11, and the conveyed object is conveyed.

Here, since the first friction plate 16 is pressed against the second friction plate 18 by the urging force of the compression coil spring 10, the urging force of the compression coil spring 10 is changed so that the first friction plate 16 and the second friction plate 18 contact each other. Friction force can be adjusted. This is done by changing the position of the retaining ring 5b and moving the support shaft 5 in the axial direction. In the illustrated state, the retaining ring 5b is fitted in the leftmost set hole 5d, so that the support shaft 5 is in the rightmost position. Therefore, the biasing force of the compression coil spring 10 and thus the first
The frictional force between the friction plate 16 and the second friction plate 18 is the smallest, so that the accumulation rate state is achieved with a relatively low rotational resistance. On the other hand, when the support shaft 5 is moved to the left side in the drawing and the retaining ring 5b is fitted into the rightmost set hole 5d, the urging force of the compression coil spring 10, and thus the first friction plate 16 and the second friction plate 18, The frictional force between the first friction plate 16 and the
There is no slippage between the second friction plate 18 and the second friction plate 18, and therefore the rotational force of the sprocket 11 is transmitted to the conveying roller 3 without being interrupted.

Since the conveying roller 3 is rotated by the frictional force as described above, if the frictional force is not stable,
This causes variation in the branch point between the transport state and the accumulation rate state, which in turn causes variation in the transport force. Specifically, even if the same transported object is stopped by a stopper, the transport roller will continue to rotate, or if relatively heavy objects are transported, the rotation of the transport roller will stop even though it is not in the accumulation position. It causes a problem such as doing. In this regard, conventionally, the friction plate on the conveying roller side and the friction plate on the sprocket side are usually a combination of a hard resin plate and a metal plate or a hard resin plate in order to ensure wear resistance therebetween. Therefore, both friction plates are often mounted in a mutually inclined state due to variations in the machining accuracy or assembly accuracy of the friction plates.In this case, the friction plates contact each other at points or lines instead of contacting the entire surface. Therefore, a sufficient frictional force that should be originally obtained cannot be obtained, and the frictional force in each conveying roller varies, which in turn causes the conveying force to vary. Also, since it is a point or line hit, it causes a decrease in the frictional force due to a decrease in the effective diameter of the friction plate due to uneven wear, which in turn leads to a change in the conveying force over time, and stable performance can be exhibited over a long period of time. could not.

However, according to the friction plate structure of this embodiment, the second friction plate 18 is made of a thin sliding bearing material containing tetrafluoroethylene resin as a main component, and the back surface side is made of the spacer 17 having elasticity. Because it has been received, this second
The friction plate 18 has both characteristics of abrasion resistance and appropriate flexibility.

Moreover, since the first friction plate 16 is also received by the spacer 15 (felt) having elasticity, for example, when the axes of both friction plates 16 and 18 are not aligned or parallel to each other, that is, one of Friction plate 16 (18)
Even when the first friction plate 16 is pressed against the second friction plate 18 by the compression coil spring 10, the mutual inclination is absorbed (alignment). Function), both friction plates 16 and 18 contact each other. In addition, even if there is some variation in the plane accuracy of the friction surfaces of the two friction plates 16 and 18, the second friction plate 1
Since 8 has elasticity, this variation is absorbed,
Therefore, also in this case, the two friction plates 16 and 18 contact each other.

As described above, when the friction plates 16 and 18 are inclined with respect to each other due to variations in processing accuracy or assembly accuracy, or the plane accuracy of the friction surfaces of the friction plates 16 and 18 varies. Even in such a case, the first friction plate 16 is moved to the second friction plate 1 by the urging force of the compression coil spring 10.
In the state of being pressed against 8, these variations are absorbed, so that the first friction plate 16 and the second friction plate 18 are in good contact with each other. Since both friction plates 16 and 18 come into contact with each other, it is possible to obtain a friction force almost as set, and therefore, it is not necessary to set the conveying force in advance in consideration of variations as in the conventional case, and it is possible to obtain the minimum necessary amount. It is enough to set the carrying capacity of. From this, it is possible to solve the conventional troubles such as the damage of the conveyed product in the accumulation state or the conveyed product getting over the stopper as described above.

Further, since both friction plates 16 and 18 come into contact with each other, the urging force of the compression coil spring 10 is applied to both friction plates 16 and 18.
The frictional surface is evenly acted on, so that uneven wear as in the case of hitting a point or a line does not occur, so that a uniform and stable conveying force can be maintained for a long period of time.

Further, since the first friction plate 16 is received by the felt material as the spacer 15, the felt material can absorb the oil component, and the both friction plates 1
It is possible to prevent oil from adhering to the friction surfaces 6 and 18.

In the above example, the second friction plate 18 is 4
Although the sliding bearing material containing the fluorinated ethylene resin as the main component is used, the sliding bearing material containing the other fluorine resin as the main component such as a fluororesin elastomer is not limited to this, and further, The soft resin may be used as a material. Further, even when the second friction plate 18 is made of a hard resin, a good centering function can be provided by reducing the plate thickness and receiving it by the spacer having the elastic body.

Further, the first friction plate 15 is not limited to a stainless steel plate, but may be another metal plate, and the first friction plate on the side of the conveying roller 3 or both friction plates are flexible in the plate thickness direction. It is also possible that at least one of the friction plates has appropriate flexibility in the plate thickness direction, so that both friction plates are in contact with each other by the spring force. Good.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an accumulating roller conveyor showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a main part of the present invention.

[Explanation of symbols]

 1 ... Accumulation roller conveyor 3 ... Conveying roller 4 ... Chain 5 ... Support shaft 10 ... Compression coil spring 11 ... Sprocket 15 ... Spacer (felt) 16 ... First friction plate (stainless steel plate) 17 ... Spacer (rubber) 18 ... 2 friction plates (tetrafluoroethylene resin)

Claims (3)

[Claims] 1. An accumulating roller conveyor which presses an end surface of a conveying roller against an end surface of a sprocket on a driving side and transmits the conveying force to the conveying roller through a frictional force between the two, which is attached to an end surface of the conveying roller. And a second friction plate mounted on the end face of the sprocket, wherein at least one of the friction plates is a resin plate having flexibility in the plate thickness direction. The friction plate structure of the roller conveyor for accumulation. 2. An accumulating roller conveyor which presses an end surface of a conveying roller against an end surface of a sprocket on a driving side and transmits the conveying force to the conveying roller through a frictional force between the two. And a second friction plate mounted on the end face of the sprocket, wherein one friction plate is a resin plate having slidability and flexibility in the plate thickness direction, and the other friction plate is The friction plate structure of the roller conveyor for accumulation is characterized in that the plates are metal plates, and the back surfaces of both friction plates are received by elastic spacers. 3. The first friction plate mounted on the end surface of the conveying roller is made of a stainless steel plate, and the back surface of the first friction plate is received by felt as a spacer while the second friction plate mounted on the end surface of the sprocket. 3. The accumulating roller according to claim 2, wherein the plate is made of a sliding bearing material containing tetrafluoroethylene resin as a main component, and the back surface of the second friction plate is received by an elastic rubber as a spacer. Conveyor friction plate structure.