Conveying device, detaching jig, and conveying roller

Abstract

To provide a carrier device capable of transferring a workpiece having an irregular shape ring-like edge on a bottom surface to an orthogonal conveyor without a displacement or a rotation of the workpiece in the course of carrying the workpiece.SOLUTION: A carrier device 10 comprises a linear conveyor 20 for linearly carrying a workpiece W having an irregular shape ring-like edge on a bottom surface, an orthogonal conveyor 30 for carrying the workpiece W in an orthogonal direction, and an orthogonal transfer device 40. The linear conveyor consists of two strips of rubber-based timing belts 22A, 22B, and the orthogonal conveyor has two strips of rubber-based orthogonal timing belts 32A, 32B in parallel and configures an orthogonal carrier surface having a lower height than a linear carrier surface. The orthogonal transfer device comprises a conveyor lifting device having four carrier rollers 42A, 42B, 44A and 44B of which rotational axis is in parallel to a carrier direction of the two strips of timing belts of the linear conveyor and an outlet side orthogonal carrier roller 45, and lifting a carrier surface of the linear conveyor.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to a conveying device that can transfer a workpiece having an irregular ring-shaped edge on its bottom surface from a linear conveying conveyor to an orthogonal conveyor without causing misalignment or twisting, a jig for attaching and detaching small rubber rings to hard rolls used in the device, and a conveying roller. [Background technology]

[0002] In factories, conveyors are often used to transport precision machinery, covers that cover the end faces of gearboxes where tool axes are concentrated, and large glass vases that are molded. These workpieces have irregularly shaped ring-shaped edges with non-circular or non-square bottom surfaces, and if there are protruding edges on or near the periphery of the bottom surface, when the bottom surface of the workpiece is transported by the conveyor, the left and right sides of the bottom surface of the workpiece come into uneven contact with the conveyor's transport surface.

[0003] Furthermore, when a workpiece moves from one conveyor belt to another, the coefficient of friction between the workpiece and the conveying surface varies, and the contact position with the conveying surface on the upstream conveyor changes from the contact position with the conveying surface on the downstream conveyor, causing the workpiece to move two-dimensionally or in a rotational direction.

[0004] On the other hand, if the irregular ring-shaped edge is placed and transported on two rubber timing belts in such a way that it partially protrudes from the timing belts, the space between the two timing belts will not come into contact with the irregular ring-shaped edge, and the left and right timing belts will operate in sync and will not slip against the rubber, so there will be no phase difference between the left and right belts and the workpiece can be transported without any problems.

[0005] However, when such a workpiece is transferred from the two rubber timing belts to the next orthogonal timing belt by changing the conveying direction at a right angle using a transfer conveyor, the contact point between the first irregular ring-shaped edge and the two rubber timing belts comes into contact with the transfer conveyor, causing the position or posture of the workpiece to change.

[0006] One possible solution to this problem is to use a robot to lift the workpiece, rotate it to the correct position, return it to its original position, and then lower it onto the conveying surface of a perpendicular conveyor.

[0007] However, this method has the drawback of taking time to change direction, increasing the cost of the robot and sensors, and increasing the risk of the line coming to a halt if a malfunction occurs in these components.

[0008] Patent Document 1 is a prior art document, but it does not disclose any conveying device that changes the direction of conveyance by two belts, such as at a right angle, during conveyance. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 169148 / 1983 Summary of the Invention [Problem to be solved by the invention]

[0010] The objective of this invention is to provide a conveying device that allows a workpiece having an irregular ring-shaped edge on its bottom surface to be transferred to two orthogonal rubber timing belts without being displaced or rotated on an orthogonal conveyor during transport, a conveying roller used in this conveying device, and a jig for attaching and removing rubber rings from this conveying roller. [Means for solving the problem]

[0011] The inventors have provided an orthogonal transfer device that includes conveying rollers that are arranged to sandwich two rubber timing belts that convey the workpieces in a linear manner and that can rotate in orthogonal directions, and the middle part of this conveying roller is made into a thin-diameter part so that it does not come into contact with the workpiece on the conveying roller within a range corresponding to the gap between the orthogonal rubber timing belts, and rubber rings with a high friction coefficient are fitted to both axial sides of this thin-diameter part, allowing the workpieces to be transported steadily.

[0012] That is, the above-mentioned problems can be solved by the following examples.

[0013] The present invention is a conveying device comprising: a linear conveyor for linearly conveying a workpiece having a non-uniform ring-shaped edge portion on its bottom surface by placing the bottom surface on a horizontal linear conveying surface; an orthogonal conveyor for conveying the workpiece in a direction perpendicular to the linear conveyor; and an orthogonal transfer device for transferring the workpiece from the linear conveyor to the orthogonal conveyor, wherein the linear conveyor is composed of two parallel rubber timing belts, and the distance between the outer ends of the two timing belts in the width direction and the distance between the two timing belts are set so that the workpiece is placed at at least two points on each of the non-uniform ring-shaped edge portions for each belt, and the orthogonal conveyor has two parallel rubber orthogonal timing belts having a configuration similar to the two parallel rubber timing belts in the linear conveyor, and the linear conveyor The line in The orthogonal transfer device forms an orthogonal conveying surface that is lower in height than the conveying surface, and the orthogonal transfer device includes at least four conveying rollers whose rotation axes are parallel to the conveying direction of the two timing belts, and a conveyor module that forms a part of the linear conveyor. straight line Conveying surface ofand a conveyor lifting device that can move up and down between a height of 100 mm and a retracted height that is lower than the orthogonal conveying surface, wherein the height of the horizontal transfer conveying surface formed by the at least four conveying rollers is the same as the orthogonal conveying surface, the conveying rollers include a total of four rollers that are positioned to sandwich at least the two timing belts from both sides in the width direction, and each roller has a narrow-diameter non-contact portion in the middle portion in the axial direction of the roller, and both sides of the non-contact portion in the axial direction of the roller are contact support portions that are larger in diameter than the non-contact portion so that they contact the bottom surface of the work to be conveyed, the contact support portions are configured to be longer than the range between the two outer width directions of the two orthogonal timing belts on the orthogonal conveyor, and are arranged so that the orthogonal conveying surface is formed in the range between the outer width directions of the two orthogonal timing belts on the orthogonal conveyor, on the extension of the conveying surface of the two orthogonal timing belts.

[0014] The present invention also provides A device for attaching and detaching a small rubber ring to the hard roll in the work transport device, The above-mentioned problem is solved by a tool for attaching and detaching small rubber rings to and from a hard roll, characterized in that the tool comprises a conveying roller having two or three small rubber rings of the same size fitted axially around the outer periphery of each axial end of a hard roll made of an iron-based metal, and a pair of separating plates that can be inserted into the adjacent surfaces between the fitted small rubber rings on the hard roll in a perpendicular plane perpendicular to the axis of the hard roll, and that can move back and forth in the axial direction of the conveying roller with the small rubber rings attached, the pair of separating plates being able to move back and forth in the axial direction of the conveying roller with the small rubber rings attached, the pair of separating plates being able to move back and forth so as to sandwich the small rubber rings in the diameter direction within a perpendicular plane perpendicular to the axis of the hard roll and passing through the adjacent surfaces, and the small rubber rings have a symmetrical U-shaped recess that opens on the side facing the small rubber rings when viewed from the axial direction of the hard roll, the width of the U-shape of the recess is large enough to fit the hard roll, and the inner diameter is smaller than the outer diameter of the small rubber rings.

[0015] The present invention also provides a conveying device for conveying a workpiece having an irregular ring-shaped edge on its bottom surface in a linear manner in a direction perpendicular to the roller axis by placing the workpiece on a horizontal linear conveying surface. An orthogonal transfer device that transfers the work from a linear conveyor including two rubber timing belts to an orthogonal conveyor including a rubber orthogonal timing belt that is orthogonal to the two rubber timing belts.A conveying roller for a conveyor, the conveying roller comprising: The timing belt is provided so as to sandwich the timing belt on one side of the width direction of the linear conveyor in parallel, and The middle part of the roller axis The irregular ring-shaped edge portion is not in contact with the The non-contact portion has a small diameter, and both sides of the non-contact portion in the roller axial direction are made to contact the bottom surface of the workpiece to be conveyed. Consists of rubber rollers The above-mentioned problems are solved by a conveying roller characterized by being a contact support portion. [Effects of the Invention]

[0016] According to the present invention, a workpiece having an irregular ring-shaped edge on its bottom surface, which is transported by a two-strand rubber timing belt, can be transferred to a perpendicular rubber timing belt without shifting in two dimensions or twisting its posture. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a plan view schematically illustrating a conveying device according to an embodiment of the present invention. [Figure 2] FIG. 10 is a perspective view showing the positional relationship between a workpiece conveyed by the conveying device and a barcode reader that reads a barcode provided on the workpiece. [Figure 3] Enlarged side view along line III-III in Figure 1 [Figure 4] FIG. 2 is an enlarged plan view of the orthogonal transfer device of FIG. [Figure 5] A plan view showing the contact points between the timing belts and the irregular ring-shaped edge, from the state immediately before being transferred onto the orthogonal conveyor, conveyed by two rubber timing belts, to the end of the transfer. [Figure 6] FIG. 1 is a perspective view showing a hard roll constituting a conveying roller in an orthogonal transfer device, a rubber ring fitted thereto, and a jig for removing the rubber ring. [Figure 7] FIG. 10 is a perspective view showing the conveying roller with a part of the jig inserted between the rubber rings. [Figure 8] FIG. 2 is a block diagram showing a control device in the transport device according to the embodiment. [Figure 9]FIG. 10 is a perspective view showing a state in which a jig for removing a rubber ring is attached to a conveying roller; [Figure 10] 1 is a perspective view showing a process of removing a rubber ring from a hard roll. [Figure 11] A plan view showing a schematic comparison of two or three rubber rings depending on the shape and size of the workpiece. DETAILED DESCRIPTION OF THE INVENTION

[0018] [Example] A conveying device 10 according to an embodiment of the present invention will be described below with reference to the drawings.

[0019] As shown in Figure 1, the conveying device 10 includes a linear conveyor 20 for linearly conveying a workpiece W having an irregular ring-shaped edge portion 2 (see Figure 2) on its bottom surface 1 by placing the bottom surface 1 on a horizontal linear conveying surface 21 (see Figure 3), an orthogonal conveyor 30 for conveying the workpiece W in a direction perpendicular to the linear conveyor 20, and an orthogonal transfer device 40 for transferring the workpiece W from the linear conveyor 20 to the orthogonal conveyor 30.

[0020] The linear conveyor 20 is provided with two parallel rubber timing belts 22A and 22B, and the distance L between the outer ends of the two timing belts 22A and 22B in the width direction is out , and the distance L between the two timing belts 22A and 22B in However, each groove is configured so that the workpiece W can be placed at at least two points on the irregular ring-shaped edge portion 2.

[0021] The orthogonal conveyor 30 has two parallel rubber-based orthogonal timing belts 32A and 32B that are configured similarly to the two parallel rubber-based timing belts 22A and 22B in the linear conveyor 20, and forms an orthogonal conveying surface 31 that is lower in height than the linear conveying surface 21.

[0022] The orthogonal transfer device 40 is configured to include four conveying rollers 42A, 42B, 44A, and 44B whose rotation axes are parallel to the conveying direction of the two timing belts 22A and 22B, an outlet orthogonal conveying roller 45, and a conveyor lifting device 26 that enables the conveying surface of one conveyor module 24C (see Figure 4) of the three conveyor modules 24A, 24B, and 24C that form part of the linear conveyor 20 to move up and down between the height of the linear conveying surface 21 and a retraction height 21A that is lower than the orthogonal conveying surface 31.

[0023] The height of the horizontal transfer conveyance surface 46 of the conveyance rollers 42A, 42B, 44A, 44B and the outlet-side orthogonal conveyance roller 45 is set to the same height as the orthogonal conveyance surface 31.

[0024] Conveying rollers 42A and 42B are disposed at positions to sandwich timing belt 22A from both sides in the width direction, and conveying rollers 44A and 44B are disposed at positions to sandwich timing belt 22B from both sides in the width direction. Exit-side orthogonal conveying roller 45 is disposed between the lowermost conveying roller 44B and orthogonal conveyor 30 in FIG. 1, and is parallel to conveying rollers 42A to 44B.

[0025] In addition, the conveying rollers 42A to 44B and the exit orthogonal conveying roller 45 each have a non-contact portion 47 with a small diameter in the middle portion in the roller axial direction, and contact support portions 48A, 48B with a larger diameter than the non-contact portion 47 so that both sides of the non-contact portion 47 in the roller axial direction come into contact with the bottom surface 1 of the workpiece W to be conveyed.

[0026] The contact support portions 48A, 48B are longer than the widthwise outer range of the two timing belts 32A, 32B on the orthogonal conveyor 30, and are arranged so as to form an orthogonal conveying surface 31 in the widthwise outer range.

[0027] Here, the distance L between the outer ends of the two timing belts 22A and 22B in the width direction is outis made larger than the minimum outer diameter of the irregular ring-shaped edge portion 2 so that when the irregular ring-shaped edge portion 2 is placed on the linear conveyor 20, it comes into contact with the timing belts 22A and 22B at at least two points (see contact points 23 in FIG. 5) within the linear conveying surface 21. Note that reference numeral 27 in FIG. 5 indicates a non-contact point.

[0028] Here, the conveying rollers 42A to 44B in the orthogonal transfer device 40 and the exit orthogonal conveying roller 45 are configured by fitting rubber rings 52, 54 to the outer periphery on both axial sides of a small-diameter non-contact portion 47 at the axial center position of a hard roll 50 made of an iron-based metal, as shown enlarged in Figures 6 and 7, and these outer peripheries form contact support portions 48A, 48B.

[0029] 8, the conveying device 10 according to this embodiment is equipped with a control device 60. This control device 60 controls the linear conveyor 20, the orthogonal conveyor 30, the orthogonal transfer device 40, the conveyor lifting device 26, and the BCR (barcode reader) 12.

[0030] In this embodiment, the conveying rollers 42A to 44B in the orthogonal transfer device 40 and the exit-side orthogonal conveying roller 45 are configured by fitting rubber rings 52, 54 to the hard roll 50 as described above, and these rubber rings 52, 54 are each made up of small rubber rings each having a length divided into two in the axial direction, and these small rubber rings 52A, 52B, 54A, 54B are each configured to be fitted to the hard roll 50 in the axial direction in sequence and to be removable in sequence. The rubber ring may also be made up of small rubber rings each having a length divided into three (described in detail later).

[0031] The above-mentioned exit orthogonal conveying roller 45 is arranged between the four conveying rollers 42A to 44B and the orthogonal conveyor 30, and is configured to smoothly transfer the work W carried out by the conveying rollers 42A to 44B onto the orthogonal conveying surface of the orthogonal conveyor 30.

[0032] The rubber rings 52, 54 or small rubber rings 52A to 54B are press-fitted from both ends of the hard roll 50 in the axial direction, so that the workpiece W can be transferred onto the orthogonal conveyor 30 without slipping.

[0033] These rubber rings 52, 54 or small rubber rings 52A to 54B are made of hard rubber material, but the surfaces are damaged or worn away by contact with the workpiece W, so they need to be replaced as needed.

[0034] Next, with reference to Figures 6, 7, 9 and 10, we will explain a removal and installation jig 70 that makes it possible to easily remove the small rubber rings 52A to 54B that are tightly pressed into the hard roll 50 made of an iron-based metal.

[0035] As shown in Figures 6 and 7, the removal and installation jig 70 includes a pair of separation plates 72A, 72B that can be inserted into the adjacent surfaces 53, 55 between the small rubber rings 52A to 54B fitted to the hard roll 50 and can move freely back and forth in the axial direction of the conveying rollers 42A to 44B, 45 with the rubber rings attached.

[0036] This pair of separating plates 72A, 72B are perpendicular to the axis of the hard roll 50 and can move freely back and forth within a vertical plane including the adjacent surfaces 53, 55, so as to sandwich the small rubber ring in the diametrical direction. When viewed from the axial direction of the hard roll 50, they have recesses 74A, 74B that open into a symmetrical U-shape on the small rubber ring side, and the width of the U in the recesses 74A, 74B is large enough to allow the hard roll 50 to fit inside, and the inner diameter is smaller than the outer diameter of the small rubber ring.

[0037] That is, when the small rubber ring is removed from the hard roll 50, as shown in FIG. 9, the U-shaped recesses 74A, 74B are pressed into contact with the surface of the hard roll 50 between the adjacent surfaces 53, 55 from the left and right in a plane perpendicular to the hard roll 50, and the two separating plates 72A, 72B surround the hard roll 50 in the axial direction at the axial positions of the adjacent surfaces 53, 55 of the hard roll 50.

[0038] Next, in the state shown in Fig. 9, as shown in Fig. 10, a detachment pipe 76 is inserted into the hard roll 50 from the axially opposite side of the separating plates 72A, 72B, and the separating plates 72A, 72B that sandwich the hard roll 50 radially are pushed up from below by the detachment pipe 76, whereby the small rubber ring 52A on the axially outer side of the small rubber ring 52B can be extracted from the hard roll 50. Here, the length of the detachment pipe 76 is longer than the hard roll 50, and the inner diameter is larger than the outer diameter of the rubber rings 52, 54 and smaller than the outer diameter of the separating plates 72A, 72B in the combined state.

[0039] Similarly, by inserting the separating plates 72A, 72B under the small rubber ring 52B and pushing up the separating plates 72A, 72B from below using the detachment pipe 76, the remaining small rubber ring 52B can also be removed.

[0040] When fitting the small rubber ring, first, the small rubber ring 52B is attached to the hard roll 50, and then a pair of separating plates 72A, 72B, which are combined as shown in Fig. 9, are pressed down from above using the detachable pipe 76, so that the small rubber ring 52B can be easily and firmly fitted into the hard roll 50. By repeating the same process, the small rubber ring 52A can be pressed down to a position adjacent to the small rubber ring 52B and fitted.

[0041] In the above embodiment, the rubber rings 52 and 54 are each composed of two (two rows) small rubber rings 52A and 52B, and small rubber rings 54A and 54B, but as shown in the right half of Figure 11, they may each be composed of three (three rows) small rubber rings 52a, 52b, 52c, and small rubber rings 54a, 54b, 54c.

[0042] In detail, depending on the difference in the irregular ring shape of the workpiece W that comes into contact with the conveying roller, there are cases where two rows of small rubber rings are sufficient, as shown in the left half of Figure 11, and cases where three rows are required, as shown in the right half of Figure 11, in order for the contact points with the workpiece W to surround the center of the workpiece. Therefore, this can be accommodated by using the same number of small rubber rings (2 or 3) of the same size. [Explanation of symbols]

[0043] 1...Bottom 2...Irregular ring-shaped edge 10...Transportation device 12...BCR (barcode reader) 12A…Field of view 14...Barcode 20...Linear conveyor 21...Straight conveying surface 21A...Retreat height 22A, 22B, 32A, 32B...Rubber timing belts 23…Contact point 24A, 24B, 24C...Conveyor modules 26...Conveyor lifting device 27…Non-contact point 30...Orthogonal conveyor 31...Orthogonal conveying surface 40...Orthogonal transfer device 42A, 42B, 44A, 44B...Transport rollers 45...Outlet orthogonal transport roller 46...Transfer surface 47...Non-contact part 48A, 48B…Contact support part 50...Hard roll 52, 54...Rubber ring 52A, 52B, 52a, 52b, 52c, 54A, 54B, 54a, 54b, 54c...Small rubber ring 53, 55...adjacent surfaces 60...Control device 70...Detachment jig 72A, 72B...Separation plates 74A, 74B...recesses 76...Detachable pipe Lin …Distance between timing belts L out …Distance between the outermost ends in the width direction W…Work

Claims

1. A conveying device comprising: a linear conveyor for linearly conveying a workpiece having an irregular ring-shaped edge portion on its bottom surface by placing the bottom surface of the workpiece on a horizontal linear conveying surface; an orthogonal conveyor for conveying the workpiece in a direction perpendicular to the linear conveyor; and an orthogonal transfer device for transferring the workpiece from the linear conveyor to the orthogonal conveyor, The linear conveyor is composed of two parallel rubber timing belts, and the distance between the outer ends of the two timing belts in the width direction and the distance between the two timing belts are set so that the workpieces can be placed at at least two points on each of the irregular ring-shaped edge portions for each belt, The orthogonal conveyor has two parallel rubber-based orthogonal timing belts having a configuration similar to that of the two parallel rubber-based timing belts in the linear conveyor, and forms an orthogonal conveying surface that is lower in height than the linear conveying surface in the linear conveyor; The orthogonal transfer device includes at least four conveying rollers whose rotation axes are parallel to the conveying direction of the two timing belts, and a conveyor lifting device that allows a conveyor module constituting a part of the linear conveyor to move up and down between the height of the linear conveying surface and a retracted height lower than the orthogonal conveying surface, and the height of the horizontal transfer conveying surface formed by the at least four conveying rollers is the same height as the orthogonal conveying surface, The conveying rollers include a total of four rollers arranged at positions sandwiching at least the two timing belts from both sides in the width direction, and each roller has a middle portion in the roller axial direction that is a non-contact portion with a small diameter, and both sides of the non-contact portion in the roller axial direction that are contact support portions with a larger diameter than the non-contact portion so as to contact the bottom surface of the workpiece to be conveyed, The contact support portion is configured to be longer than the range between the two outer width sides of the two orthogonal timing belts on the orthogonal conveyor, and is arranged so as to form the orthogonal conveying surface in the range between the two outer width sides of the two orthogonal timing belts on the orthogonal conveyor, and in the range on the extension of the conveying surface of the two orthogonal timing belts.

2. In claim 1, A workpiece transport device characterized in that the distance between both outer ends in the width direction of the two timing belts is greater than the minimum outer diameter of the irregular ring-shaped edge portion.

3. In claim 1 or 2, The workpiece transport device is characterized in that the transport roller has a hard roll made of an iron-based metal, and the contact support portion is configured by fitting a rubber ring to the outer periphery of each of the non-contact portions on both axial sides thereof.

4. In claim 3, A workpiece transport device characterized in that the rubber rings fitted onto the outer periphery of both axial sides of the non-contact portion each consist of small rubber rings whose length is divided into two or three in the axial direction, and each of the small rubber rings is fitted onto the hard roll sequentially in the axial direction and can be removed sequentially.

5. In claim 3 or 4, The orthogonal transfer device is a work transport device characterized in that an additional outlet orthogonal transport roller is provided between the transport roller facing the orthogonal conveyor on the outer side of one of the two timing belts in the linear conveyor in the conveyor width direction and the orthogonal conveyor.

6. A device for attaching and detaching small rubber rings to the hard roll in the work conveying device described in claim 4, comprising a conveying roller made of an iron-based metal, with two or three small rubber rings of the same size fitted axially on the outer periphery of each of the axial ends of the hard roll, and a pair of separating plates which can be inserted into adjacent surfaces between the fitted small rubber rings on the hard roll in a straight plane perpendicular to the axis of the hard roll, and which can be moved freely back and forth in the axial direction of the conveying roller when the small rubber rings are attached, The pair of separating plates are perpendicular to the axis of the hard roll and can freely move back and forth within a vertical plane passing through the adjacent surfaces to sandwich the small rubber ring in the diameter direction, and when viewed from the axial direction of the hard roll, the small rubber ring side has a recess that opens into a symmetrical U-shape, and the width of the U-shape in the recess is large enough to allow the hard roll to fit inside, and the inner diameter is smaller than the outer diameter of the small rubber ring.This is a jig for attaching and detaching a small rubber ring to a hard roll, characterized in that

7. In claim 6, A tool for removing and attaching a small rubber ring to a hard roll, characterized in that it has an inner diameter larger than the outer diameter of the small rubber ring and an outer diameter sized to be able to abut in the axial direction of the hard roll on the outer region of the small rubber ring on the pair of separating plates when the hard roll is sandwiched in the radial direction.

8. A conveying roller for a conveyor in an orthogonal transfer device that transfers a workpiece having an irregular ring-shaped edge on its bottom surface from a linear conveyor including two rubber timing belts for linearly conveying the workpiece in a direction perpendicular to the roller axis by placing the bottom surface of the workpiece on a horizontal linear conveying surface, to an orthogonal conveyor including a rubber orthogonal timing belt that is perpendicular to the two rubber timing belts, The conveying roller is arranged so as to sandwich the timing belt on one side of the width direction of the linear conveyor in parallel, and is characterized in that the middle part of the roller in the axial direction is a non-contact part with a small diameter so as not to contact the irregular ring-shaped edge part, and both sides of the non-contact part in the axial direction of the roller are contact support parts made of rubber rollers with a larger diameter than the non-contact part so as to contact the bottom surface of the work to be conveyed.

9. In claim 8, The conveying roller is characterized in that the contact support portion is configured by fitting a rubber ring onto the outer periphery of each of the axially opposite sides of the non-contact portion of a small-diameter hard roll made of an iron-based metal.

10. In claim 9, The rubber rings fitted to the outer periphery of both axial sides of the non-contact portion each consist of small rubber rings each having a length divided into two or three in the axial direction, and each of the small rubber rings is fitted to the hard roll in sequence in the axial direction and can be removed in sequence.

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