Roller-conveyor

Abstract

To provide an improved novel roller conveyor capable of suppressing wear of a transmission belt and easily or quickly replacing the transmission belt.MEANS FOR SOLVING THE PROBLEM: A roller conveyor according to the present invention comprises: a drive roller and at least one relay roller, each rotating around an axis extending in a first direction intersecting the vertical direction; and a plurality of transport rollers each rotating around an axis extending in the first direction and arranged in a second direction intersecting the first direction and also the vertical direction, wherein the relay roller rotates by receiving the rotation of a first main roller which is one of the driving roller and the other relay roller via a first transmission belt which is wound in an oval shape between the relay roller and the first main roller, and the transport roller conveys the article by being rotated when the rotation of a second main roller is transmitted through a second transmission belt wound in an oval shape between the drive roller and the second main roller, which is one of the driving roller and the relay roller.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a roller conveyor. [Background technology]

[0002] Conventionally, a roller conveyor has been known in which a transmission belt is wound between each of a plurality of conveying rollers that convey items and a single line shaft extending in the conveying direction, and the plurality of conveying rollers are rotated via each of the transmission belts by rotating the line shaft (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-326711 Summary of the Invention [Problem to be solved by the invention]

[0004] In the roller conveyor of Patent Document 1, the rotation axes of the multiple conveying rollers and the rotation axis of the line shaft are twisted relative to each other. As a result, the transmission belt is wound in a twisted state between the conveying rollers and the line shaft. In this case, friction occurs in the twisting direction between the transmission belt and the conveying rollers and the line shaft, which may make it easier for shavings to be produced from the transmission belt.

[0005] In addition, in the roller conveyor of Patent Document 1, all transmission belts are wound around one line shaft and arranged in series. Therefore, if a transmission belt located in the middle of the series needs to be replaced due to deterioration or the like, all other transmission belts located between the transmission belt and one end of the line shaft in the longitudinal direction must be removed, which requires time and effort for replacement and restoration.

[0006] Therefore, one object of the present invention is to provide an improved new roller conveyor that can, for example, suppress wear of the transmission belt and enable easier or faster replacement of the transmission belt. [Means for solving the problem]

[0007] The roller conveyor of the present invention comprises, for example, a drive roller that rotates around an axis extending in a first direction that intersects the up-down direction, at least one relay roller that rotates around an axis extending in the first direction, and a plurality of transport rollers located above the drive roller and the relay roller, each rotating around an axis extending in the first direction, and arranged in a second direction that intersects the first direction and the up-down direction, wherein the relay roller rotates by receiving the rotation of the first drive roller via a first transmission belt wound in an oval shape between the drive roller and a first drive roller that is one of the other relay rollers, and the transport roller rotates by receiving the rotation of the second drive roller via a second transmission belt wound in an oval shape between the drive roller and a second drive roller that is one of the relay rollers, thereby transporting articles. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an exemplary schematic plan view of a roller conveyor according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II of FIG. [Figure 3] FIG. 3 is an exemplary schematic side view of a drive roller and a transport roller included in the roller conveyor of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Exemplary embodiments of the present invention are disclosed below. The configurations of the embodiments described below, as well as the actions and results (effects) obtained from the configurations, are merely examples. The present invention can also be realized by configurations other than those disclosed in the following embodiments. Furthermore, according to the present invention, it is possible to obtain at least one of the various effects (including derivative effects) obtained by the following configurations.

[0010] In this specification, ordinal numbers may be assigned for convenience to distinguish directions, parts, positions, parts, mechanisms, members, etc. Furthermore, ordinal numbers do not indicate priority or order, nor do they specify numbers.

[0011] Arrows indicating directions are drawn in each figure. The X, Y, and Z directions intersect each other and are approximately perpendicular. The X and Y directions intersect with the up-down direction. When item A is transported approximately horizontally, the X and Y directions are approximately horizontal, and the Z direction is approximately vertically upward. However, this is just one example, and within the range in which item A can be transported, the X and Y directions may be inclined relative to the horizontal plane, and the Z direction may also be inclined relative to the vertically upward. The X direction or the direction opposite to the X direction is referred to as the transport direction, the Y direction is referred to as the width direction or axial direction, and the Z direction is referred to as the upward direction.

[0012] [Transport rollers, drive rollers, and relay rollers] FIG. 1 is a plan view of a roller conveyor 100 according to an embodiment. As shown in FIG. 1, the roller conveyor 100 includes multiple conveying rollers 10. Each of the multiple conveying rollers 10 extends in the Y direction and has a substantially cylindrical outer circumferential surface extending in the Y direction. The multiple conveying rollers 10 are parallel to one another and rotate around a rotation axis extending in the Y direction. The multiple conveying rollers 10 are also aligned in the X direction at predetermined intervals, e.g., substantially constant intervals, in the X direction. In this configuration, the multiple conveying rollers 10 rotate in the same direction around their respective rotation axes, thereby conveying an article A placed on the multiple conveying rollers 10 in the X direction or in the direction opposite the X direction. The upper ends of each of the multiple conveying rollers 10 in the width direction are covered by covers 111 and 112, each of which extends in the X direction by a predetermined width in the Y direction. The Y direction is an example of a first direction, and the X direction is an example of a second direction. The intervals between the conveying rollers 10 do not have to be constant.

[0013] In this embodiment, the plurality of conveying rollers 10 are grouped into groups of adjacent conveying rollers 10. In this embodiment, a plurality of groups G1 to G3 are set, each group including a plurality of conveying rollers 10 adjacent to each other in the X direction. The plurality of conveying rollers 10 are rotated and driven by a single drive roller 20 (see FIG. 2) serving as a drive source for each group G1 to G3. In this embodiment, the number of conveying rollers 10 included in each group G1 to G3 is seven, but this is not limited thereto, and the number of conveying rollers 10 may be any number equal to or greater than two. However, a large number of conveying rollers 10 may result in an increase in the size of the electric motor serving as the drive source, or in increased energy loss during power transmission. From this perspective, it has been found that, in reality, the number of conveying rollers 10 included in each group G1 to G3 is preferably 10 or less. The number of conveying rollers 10 included in each group G1 to G3 may be different. In this embodiment, the number of groups G1 to G3 is three, but this is not limited thereto, and the number of groups G1 to G3 may be two, four, or more. The longer the length of the roller conveyor 100, the greater the number of groups G1 to G3.

[0014] Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. Fig. 3 is a side view showing the drive roller 20 and the conveyance roller 10. As shown in Fig. 2, in addition to the plurality of conveyance rollers 10 described above, group G1 includes one drive roller 20 and a plurality of relay rollers 30. Like the conveyance roller 10, the drive roller 20 and the relay roller 30 each extend in the Y direction and have a substantially cylindrical outer circumferential surface extending in the Y direction.

[0015] 3, the conveying roller 10 rotates around a rotation axis Ax1 that is substantially aligned with the Y direction. The driving roller 20 rotates around a rotation axis Ax2 that is substantially aligned with the Y direction. Although not shown, the relay roller 30 also rotates around a rotation axis that is substantially aligned with the Y direction. Note that the following mainly describes the configuration and operation of group G1, but groups G2 and G3 have the same configuration and operate in the same way.

[0016] 2, each of the conveying rollers 10 has a fixed portion 11 and a rotating portion 12 that rotates around the fixed portion 11. Each of the relay rollers 30 has a fixed portion 31 and a rotating portion 32 that rotates around the fixed portion 31.

[0017] Each drive roller 20 has a fixed portion 21 and a rotating portion 22 that rotates around the fixed portion 21. The drive roller 20 is a roller that is rotated by a rotary drive source such as an electric motor. The drive roller 20 may be a roller that houses the electric motor inside. In this case, the rotating portion 22 is configured in a cylindrical shape with an outer circumferential surface, and the fixed portion 21 is housed within the cylindrical portion of the rotating portion 22. However, the drive roller 20 is not limited to such a roller, and the electric motor may be provided outside the drive roller 20. A reduction mechanism or the like may be provided between the electric motor and the rotating portion 22.

[0018] The single drive roller 20 and the multiple relay rollers 30 are arranged at a predetermined interval, for example, at approximately regular intervals, in the X direction. The array of the single drive roller 20 and the multiple relay rollers 30 is located below the array of the multiple transport rollers 10. The total number of drive rollers 20 and relay rollers 30 is the same as the total number of the multiple transport rollers 10, and the drive roller 20 and relay roller 30 are each located below one transport roller 10 and are arranged next to that transport roller 10 in the Z direction. The intervals between the single drive roller 20 and the array of the multiple relay rollers 30 do not have to be regular.

[0019] [Transmission belt] Each first transmission belt 40 is looped only between two adjacent rollers in the X direction. That is, the first transmission belt 40 is looped separately between a drive roller 20 and one relay roller 30 adjacent to each other in the X direction, and between two adjacent relay rollers 30 adjacent to each other in the X direction. In this configuration, rotational power is first transmitted from the drive roller 20 to the two relay rollers 30 adjacent to the drive roller 20 via separate first transmission belts 40. Then, from the relay roller 30 to which the rotational power has been transmitted, the rotational power is transmitted to the relay rollers 30 located on the opposite side of the relay roller 30 from the drive roller 20 via separate first transmission belts 40. In this way, within group G1, the rotational power of one drive roller 20 is sequentially transmitted to relay rollers 30 distant from the drive roller 20 via each first transmission belt 40, and finally transmitted to all relay rollers 30 included in group G1.

[0020] As described above, the rotation axis Ax2 of the drive roller 20 and the rotation axis of the relay roller 30 are substantially parallel to each other and are not in a twisted positional relationship. Therefore, the first transmission belt 40 is looped in an elliptical shape between the drive roller 20 or the relay roller 30 (referred to as a first drive roller) and the relay roller 30 (referred to as a first driven roller) adjacent to the first drive roller in the X direction without being twisted.

[0021] In this embodiment, the second transmission belt 50 is wound only between two rollers adjacent to each other in the Z direction. That is, the second transmission belt 50 is wound separately between each conveying roller 10 and the drive roller 20 or relay roller 30 adjacent to that conveying roller 10 in the Z direction. In this configuration, rotational power is transmitted from each of the drive roller 20 and the relay roller 30 to all of the conveying rollers 10 included in the group G1 via one second transmission belt 50.

[0022] As described above, the rotation axis Ax1 of the conveying roller 10 (see FIG. 3), the rotation axis Ax2 of the driving roller 20 (see FIG. 3), and the rotation axis of the relay roller 30 are substantially parallel to one another and are not in a twisted positional relationship. Therefore, the second transmission belt 50 is looped in an elliptical shape between the driving roller 20 or the relay roller 30 (referred to as a second driving roller) and the conveying roller 10 (referred to as a second driven roller) adjacent to the second driving roller in the Z direction without being twisted.

[0023] The first transmission belt 40 and the second transmission belt 50 are round belts made of, for example, a synthetic resin material or an elastomer, and have a circular cross section.

[0024] [Arrangement of drive rollers and relay rollers] As described above, in a configuration in which rotational power is transmitted sequentially from the drive roller 20 to each relay roller 30 via another relay roller 30 and multiple first transmission belts 40, the greater the number of intervening relay rollers 30 and first transmission belts 40, the greater the loss of rotational power due to slippage between each roller and the first transmission belts 40. Therefore, the number of first transmission belts 40 intervening between the drive roller 20 and the relay roller 30, i.e., the number of relay rollers 30 that can transmit the rotational power of the drive roller 20 without hindrance, is limited.

[0025] For this reason, if the group G1 has one drive roller 20 and an array of multiple relay rollers 30, and the drive roller 20 is located at the end of the array in the X direction or the opposite direction in the X direction, the number of relay rollers 30 that can be included in the group G1, and therefore the number of conveyance rollers 10, will be reduced. For example, if the maximum number of first transmission belts 40 that can be interposed between the drive roller 20 and the relay roller 30 is three, the multiple relay rollers 30 will be arranged on only one side of the drive roller 20 in the X direction (for example, only the front in the X direction), so the group G1 will include one drive roller 20, three relay rollers 30, and four conveyance rollers 10. In this case, the length of the group G1 in the X direction will be shorter, and the number of drive rollers 20 per unit length of the roller conveyor 100 will be increased, which may result in increased energy consumption.

[0026] In this regard, in the present embodiment, the drive roller 20 is located between two relay rollers 30, and the drive roller 20 can rotate and drive multiple relay rollers 30 arranged on both sides of the drive roller 20 in the X direction (front and rear in the X direction). In this case, the number of relay rollers 30 that can be included in the group G1, and therefore the number of conveyance rollers 10, can be increased. For example, if the maximum number of first transmission belts 40 that can be interposed between the drive roller 20 and the relay roller 30 is three, the multiple relay rollers 30 are arranged on both sides of the drive roller 20 in the X direction, so that the group G1 includes one drive roller 20, six relay rollers 30, and seven conveyance rollers 10, as shown in FIG. 1. As such, according to this embodiment, the length of the group G1 in the X direction can be increased, and the number of drive rollers 20 per unit length of the roller conveyor 100 can be reduced, thereby reducing energy consumption. In this embodiment, the drive roller 20 is located at the center in the X direction in the array of one drive roller 20 and multiple relay rollers 30, and the number of relay rollers 30 (3) spaced apart from the drive roller 20 in the X direction is the same as the number of relay rollers 30 (3) spaced apart from the drive roller 20 in the opposite direction in the X direction, but this configuration is not limited to this. When group G1 includes two or more relay rollers 30, a similar effect can be obtained if the drive roller 20 is located between two relay rollers 30.

[0027] [Support structure for base member, roller, and transmission belt] As shown in FIG. 3, the roller conveyor 100 includes base members 101 and 102 extending in the X direction at an end in the Y direction and an end in the opposite direction to the Y direction.

[0028] The conveying roller 10 is supported at both ends by two base members 101 and 102. On the other hand, the drive roller 20 is supported in a cantilevered manner by the single base member 101. Although not shown, the multiple relay rollers 30 are also supported in a cantilevered manner by the base member 101. Furthermore, all of the drive rollers 20 and relay rollers 30 included in group G1 are supported in a cantilevered manner by the same base member 101. The base members 101 and 102 may also be referred to as support members. Although not shown, the configuration of the outer surface of the relay roller 30 is substantially the same as the configuration of the outer surface of the drive roller 20.

[0029] An annular groove 12a for accommodating the second transmission belt 50 is provided on the outer peripheral surface of the rotating portion 12 of the conveying roller 10 near the end opposite the Y direction. An annular groove 22a for accommodating the second transmission belt 50 is also provided on the outer peripheral surface of the rotating portion 12 of the drive roller 20 near the end opposite the Y direction. An annular groove for accommodating the second transmission belt 50 is also provided on the outer peripheral surface of the rotating portion 12 of the relay roller 30. The configuration of the groove for accommodating the second transmission belt 50 provided on the relay roller 30 is substantially the same as the configuration of the groove 22a provided on the drive roller 20. The positions of the grooves 12a of the conveying roller 10, the grooves 22a of the drive roller 20, and the groove for accommodating the second transmission belt 50 on the relay roller 30 in the Y direction are substantially the same. In this configuration, all second transmission belts 50 are disposed closer to the base member 101 than to the base member 102, and are aligned along a plane intersecting the Y direction, as shown in FIG. 3 .

[0030] Two grooves 22b and 22c, each accommodating a first transmission belt 40, are provided on the outer peripheral surface of the drive roller 20. These grooves 22b and 22c are provided at a distance from each other in the Y direction and at positions farther from the base member 101 than groove 22a. One of the two grooves 22b and 22c accommodates the first transmission belt 40 that is stretched between the relay roller 30 adjacent in the X direction, and the other of the two grooves accommodates the first transmission belt 40 that is stretched between the relay roller 30 adjacent in the opposite direction in the X direction. Two grooves (not shown), each accommodating the first transmission belt 40, are also provided on the outer peripheral surface of the relay roller 30. The shapes and positions in the Y direction of these two grooves are the same as those of the grooves 22b and 22c provided on the drive roller 20. In this case, in the array of one drive roller 20 and multiple relay rollers 30 of group G1, the first transmission belts 40 closer to the base member 101 (rearward in the Y direction) and the first transmission belts 40 farther from the base member 101 (frontward in the Y direction) can be arranged alternately as they move toward the X direction. This configuration makes it possible to realize a more compact configuration in which one drive roller 20 drives and rotates each relay roller 30 via one or more first transmission belts 40. In this configuration, all of the first transmission belts 40 are also arranged closer to the base member 101 than to the base member 102, and are aligned along a plane intersecting the Y direction, as shown in FIG. 3 .

[0031] As described above, the first transmission belt 40 is stretched between the cantilevered drive roller 20 or relay roller 30 and another cantilevered relay roller 30. Therefore, if the first transmission belt 40 needs to be replaced due to deterioration or the like, the first transmission belt 40 can be removed from the tip side of the cantilevered drive roller 20 or relay roller 30, and a new replacement first transmission belt 40 can be attached from the tip side. In other words, this configuration makes it possible to replace the first transmission belt 40 more easily or quickly. Note that if another first transmission belt 40 is located closer to the tip side of the drive roller 20 or relay roller 30 than the first transmission belt 40 to be replaced, the other first transmission belt 40 can be removed first.

[0032] Furthermore, the first transmission belt 40 is located closer to the tip of the drive roller 20 or the relay roller 30 than the second transmission belt 50. Therefore, when replacing the first transmission belt 40 from the tip of the drive roller 20 or the relay roller 30, which are supported at one end, interference with the second transmission belt 50 can be avoided. In other words, the first transmission belt 40 can be replaced without removing the second transmission belt 50. This configuration allows the first transmission belt 40 to be replaced more easily or more quickly.

[0033] The conveying roller 10 is configured to be elastically expandable and contractible in the Y direction. When the conveying roller 10 is contracted, the fixed portion 11 located at the end opposite the Y direction can be removed from the base member 101, i.e., the base member 101 that cantilever-supports the drive roller 20 and the relay roller 30. Therefore, when replacing the second transmission belt 50, first, the conveying roller 10 is contracted and the end opposite the Y direction of the conveying roller 10 is removed from the base member 101. Next, the second transmission belt 50 is removed from the contracted conveying roller 10 and dropped onto the drive roller 20 or the relay roller 30. Then, the first transmission belt 40 stretched around the drive roller 20 or the relay roller 30 is removed. This allows the second transmission belt 50 to be removed from the tip side of the drive roller 20 or the relay roller 30. In other words, this configuration also allows the second transmission belt 50 to be replaced more easily or quickly.

[0034] To avoid damage due to contact with the article A, the second transmission belt 50 is preferably kept out of the conveying area of the article A. If the group G1 includes a second transmission belt 50 located near the end of the conveying roller 10 in the Y direction in addition to a second transmission belt 50 located near the end of the conveying roller 10 in the opposite direction in the Y direction, avoiding interference between the article A and these second transmission belts 50 would narrow the width over which the article A can be conveyed on the conveying roller 10. In this regard, in this embodiment, all of the second transmission belts 50 included in the group G1 are located closer to only the end of the conveying roller 10 in the opposite direction in the Y direction than to the center of the conveying roller 10 in the Y direction, i.e., they are located closer to only one end in the width direction. This allows a wider width over which the article A can be conveyed on the conveying roller 10.

[0035] [cover] The roller conveyor 100 is provided with a cover 111 that covers the second transmission belt 50 from above. As shown in FIG. 1, the cover 111 extends in the X direction with a predetermined width in the Y direction at the end of the roller conveyor 100 opposite the Y direction. The cover 111 is fixed to the base member 101. The cover 111 can prevent interference between the article A and the second transmission belt 50. The cover 111 can also prevent any object from entering between the base member 101 or the fixed part 11 and the rotating part 12, which could interfere with the rotation of the rotating part 12.

[0036] 3, the roller conveyor 100 is also provided with a cover 113 that covers the second transmission belt 50, the first transmission belt 40, the drive roller 20, and the multiple relay rollers 30 from below. Like the cover 111, the cover 113 also extends in the X direction with a predetermined width in the Y direction at the end of the roller conveyor 100 opposite the Y direction. The cover 113 is fixed to the base member 101. The cover 113 can prevent any object from interfering with the second transmission belt 50, the first transmission belt 40, the drive roller 20, and the multiple relay rollers 30 from below.

[0037] Furthermore, the roller conveyor 100 is provided with a cover 112 that covers the Y-direction end of the transport roller 10 from above. As shown in Fig. 1, the cover 112 extends in the X-direction at the Y-direction end of the roller conveyor 100 with a predetermined width in the Y-direction. The cover 112 is fixed to the base member 102. The cover 112 can prevent any object from entering between the base member 102 or the fixed part 11 and the rotating part 12 and interfering with the rotation of the rotating part 12.

[0038] As described above, in this embodiment, the first transmission belt 40 is wound in an elliptical shape between the drive roller 20 or the relay roller 30 (first main driving roller) and another relay roller 30 different from the first main driving roller. The second transmission belt 50 is wound in an elliptical shape between the drive roller 20 or the relay roller 30 (second main driving roller) and the conveying roller 10. With this configuration, the first transmission belt 40 and the second transmission belt 50 are wound in a substantially untwisted state, which reduces the amount of shavings on the transmission belt caused by friction between the rollers compared to when the belts are wound in a twisted state.

[0039] Furthermore, in this embodiment, unlike Patent Document 1, in which all transmission belts that transmit rotational power to the respective conveying rollers are wound around a single driving roller that extends long in the conveying direction and arranged in series, the first transmission belt 40 and the second transmission belt 50 can be replaced more easily and quickly.

[0040] In this embodiment, the drive roller 20 and the relay roller 30 are aligned in the X direction (second direction). This configuration allows the height of the roller conveyor 100 in the Y direction to be lower than in a configuration in which the drive roller 20 and the relay roller 30 are offset in the Y direction.

[0041] While the embodiments of the present invention have been described above, they are merely examples and are not intended to limit the scope of the invention. The above embodiments can be implemented in various other forms, and various omissions, substitutions, combinations, and modifications can be made without departing from the spirit of the invention. Furthermore, the specifications of each configuration, shape, and the like (structure, type, direction, model, size, length, width, thickness, height, number, arrangement, position, material, etc.) can be appropriately modified and implemented.

[0042] For example, the number and arrangement of the transport rollers, drive rollers, and relay rollers are not limited to those in the above embodiment. Furthermore, the roller conveyor may include at least one relay roller. Furthermore, the drive roller and relay roller may be supported by a base member located at the end in the Y direction. [Explanation of symbols]

[0043] 10...Transport roller 11...Fixed part 12...Rotating part 12a...Groove 20...Drive roller 21...Fixed part 22...Rotating part 22a, 22b, 22c…Groove 30...Relay roller 31...Fixed part 32...Rotating part 40...First transmission belt 50...Second transmission belt 100...Roller conveyor 101...Base member 102...Base member 111...Cover 112...Cover 113...Cover A…Goods Ax1...Rotation axis Ax2...Rotation axis G1, G2, G3...Group X…direction (first direction) Y…direction (second direction) Z…direction

Claims

1. a drive roller that rotates around an axis extending in a first direction intersecting the up-down direction; At least one relay roller that rotates around an axis extending in the first direction; a plurality of conveyance rollers positioned above the drive roller and the relay roller, each rotating around an axis extending in the first direction, and aligned in a second direction intersecting the first direction and the up-and-down direction; Equipped with the relay roller is rotated by the rotation of the first drive roller, which is one of the other relay rollers, transmitted via a first transmission belt wound in an elliptical shape between the drive roller and the first drive roller, The conveying rollers rotate and convey articles by transmitting the rotation of a second main roller, which is either one of the drive roller or the relay roller, via a second transmission belt wound in an oval shape between the conveying rollers and the second main roller.

2. The roller conveyor according to claim 1 , wherein the drive roller and the relay roller are aligned in the second direction.

3. Two or more of the relay rollers are provided, 2. The roller conveyor of claim 1, wherein the drive roller is located between two of the relay rollers.

4. 2. The roller conveyor according to claim 1, wherein the drive roller and the relay roller are cantilevered and rotatably supported in a state where they protrude in the same direction.

5. 5. The roller conveyor according to claim 4, wherein the first transmission belt is positioned closer to a tip end of the drive roller or the relay roller than the second transmission belt.

6. 6. The roller conveyor according to claim 1, wherein the second transmission belt wound around each of the plurality of conveying rollers is positioned closer to an end of the conveying roller on the same side in the axial direction than to a center of the conveying roller in the axial direction.

7. 7. The roller conveyor according to claim 6, further comprising a cover covering the second transmission belt.

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