Conveyor apparatus

Abstract

To provide a conveyor apparatus in which a speed difference between conveyor rollers is reduced.SOLUTION: In a conveyor apparatus 1 which comprises plural conveyor rollers 5, and in which the respective conveyor rollers 5 are power-transmitted by belts 20, 30 to rotate the group of conveyor rollers 5, the conveyor rollers are power-transmitted by the different kinds of belts 20, 30. One kind of belt 20 is suspended over the one or more conveyor rollers, and the other kind of belt 30 is suspended over the adjacent conveyor roller.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a conveyor device, and more particularly to a conveyor device having a plurality of conveying rollers. [Background technology]

[0002] A conveyor device called a roller conveyor is known. A typical roller conveyor has a pair of left and right side frames arranged parallel to each other, and a plurality of conveying rollers for conveying an object are supported between the pair of side frames at predetermined intervals in the conveying direction. In roller conveyors, several conveying rollers are often rotated by power to move the conveyed object. In the roller conveyor disclosed in Patent Document 1, one of the transport rollers is a motorized roller that incorporates a drive motor, and the other transport rollers are idling rollers. In the roller conveyor disclosed in Patent Document 1, a belt is suspended between adjacent conveying rollers, and a rotational force is transmitted between the adjacent conveying rollers. In Patent Document 1, all of the conveying rollers are engaged with a belt, and the rotational force of one motorized roller is transmitted to all of the conveying rollers, causing all of the conveying rollers to rotate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-210100 [Patent Document 2] Japanese Patent Application Publication No. 2019-31346 Summary of the Invention [Problem to be solved by the invention]

[0004] As mentioned above, conventional conveyor devices have a power transmission belt (hereinafter simply referred to as the belt) suspended between adjacent conveyor rollers to transmit torque between the adjacent conveyor rollers. The belt is a frictional transmission, and there is slippage. Therefore, a speed difference occurs between the rotation of the driving roller and the rotation of the driven roller between a pair of conveyor rollers.

[0005] In the conventional conveyor device, one conveying roller serves as a driving source, and power is transmitted between adjacent conveying rollers one after another. For simplicity, let us assume that the belt has a power transmission efficiency of 90 percent, i.e., that there is a 10 percent loss due to belt slippage. The driving source (the motorized roller in the previous example) is defined as the first conveying roller, the roller that receives power transmission from the first conveying roller is defined as the second roller, and the rollers are defined as the third roller, fourth roller, fifth roller, and sixth roller in that order. If we assume that the rotation speed of the first transport roller, which is the drive source, is 100 rotations per minute, then the rotation speed of the second roller will be 90 rotations, the third roller 81 rotations, the fourth roller 73 rotations, and the final sixth roller 73 rotations. The rotation speed of the sixth roller drops to 59 rotations. In other words, because the conveyor device of the prior art is structured so that adjacent rollers are connected by a belt and the rotational force is transmitted sequentially, the loss of conductivity accumulates.

[0006] There are many different types of power transmission belts, broadly divided into those with core wires and those without core wires. For example, flat belts and round belts do not have a core wire, while toothed belts, V-belts, and V-ribbed belts do. While toothed belts are primarily designed to mesh with toothed pulleys for power transmission, some people in the art use toothed belts instead of flat belts for frictional power transmission.

[0007] Belts with core wires have little elongation and can be suspended with high tension, resulting in high power transmission efficiency. In contrast, belts without core wires, such as round belts, must be suspended with low tension, resulting in low power transmission efficiency. Therefore, if a belt having a core wire is suspended between adjacent rollers, the speed difference between the drive roller and the end roller is reduced. On the other hand, belts with cores are less likely to stretch and are therefore difficult to suspend between rollers with short distances between their axes. On the other hand, belts without cores are easier to suspend even when the distance between their axes is short. For this reason, round belts and other types of belts must be used in conveyor systems with short distances between adjacent rollers, which results in accumulated losses in transmission efficiency and a large difference in speed between the driving roller and the end roller. SUMMARY OF THE INVENTION The present invention focuses on the above-mentioned problems of the prior art, and has as its object to provide a conveyor device in which the speed difference between the conveying rollers is small. [Means for solving the problem]

[0008] One mode for solving the above-mentioned problems is a conveyor device having a plurality of conveying rollers, in which the conveying rollers are powered by a belt to rotate a group of conveying rollers, and the power is transmitted by different types of belts, with one type of belt being suspended across one or more conveying rollers and another type of belt being suspended across adjacent conveying rollers.

[0009] In the conveyor device of this embodiment, a plurality of types of belts are used, that is, belts with high transmission efficiency and belts with low transmission efficiency are used in combination. In this conveyor system, a single belt is suspended across one or more conveyor rollers, and the conveyor rollers on which the belt is suspended have a long center distance, allowing the use of a belt with high power transmission efficiency. On the other hand, other types of belts are suspended between adjacent conveying rollers, which have a short distance between their axes, but can be suspended by belts with low transmission efficiency. In this conveyor system, a belt with high power transmission efficiency is suspended across one or more conveyor rollers, so the difference in rotational speed between the rollers on which the belt is suspended is small. Although the rotational speed of the driven side of the conveyor rollers on which other types of conveyor rollers are suspended is slightly reduced, overall, the rotational speed of each conveyor roller is uniform.

[0010] In the above-described aspect, it is desirable that the different types of belts have different elongation rates, and that the belt with a low elongation rate is suspended across one or more conveying rollers, and the belt with a high elongation rate is suspended across an adjacent conveying roller.

[0011] A belt with low elongation can be suspended with high tension, resulting in high power transmission efficiency. In addition, a belt with low elongation can be suspended across one or more conveying rollers, allowing it to be suspended over a long center distance. On the other hand, a belt with a high elongation rate can be suspended even if the center distance is short.

[0012] In each of the above-described aspects, the different types of belts are a belt with a core wire and a belt without a core wire, and it is desirable that the belt with a core wire is suspended across one or more conveying rollers and the belt without a core wire is suspended across an adjacent conveying roller.

[0013] A belt with a core wire can be suspended under high tension, resulting in high power transmission efficiency. In addition, a belt with a core wire can be suspended across one or more conveying rollers, allowing it to be suspended over a long distance between the axes. On the other hand, a belt without a core can be suspended even if the distance between axes is short.

[0014] In each of the above-described embodiments, the combination of different types of belts is preferably a combination of any one of the belts described in Group 1 and any one of the belts described in Group 2, in which any one of the belts described in Group 1 is suspended across one or more conveying rollers, and any one of the belts described in Group 2 is suspended across an adjacent conveying roller. Group 1 (1) Toothed belt (2) V-ribbed belt (3) V-belt 2nd group (1) Round belt (2) Hexagonal belt (3) Rope belt

[0015] The first group of belts can be suspended with high tension, resulting in high power transmission efficiency. In addition, the first group of belts can be suspended across one or more conveying rollers, allowing for a long center distance. On the other hand, the second group of belts can be suspended even with a short center distance.

[0016] In each of the above aspects, the conveying roller has a pulley around which a belt is suspended, and it is desirable that one conveying roller is provided with two types of pulley grooves.

[0017] In the conveyor of this aspect, two types of pulley grooves are provided on one conveying roller, so that different types of belts can be wound around one conveying roller. [Effects of the Invention]

[0018] The conveyor device of the present invention has a plurality of transport rollers, and the speed difference between the transport rollers is small. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a plan view of a conveyor device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of the conveyor device of FIG. [Figure 3] 2A and 2B are enlarged views of the pulley area of ​​the conveyor device of FIG. 1, where (a) shows a state in which no belt is suspended, and (b) shows a state in which only the V-ribbed belt is suspended between the drive rollers. [Figure 4]2 is an enlarged view of the pulley area of ​​the conveyor device of FIG. 1, where (a) shows a state in which only a round belt is suspended between the drive rollers, and (b) shows a state in which both a V-ribbed belt and a round belt are suspended between the drive rollers. [Figure 5] 2A and 2B are explanatory diagrams illustrating the belt suspension path of the conveyor device of FIG. 1, where (a) shows a state in which the belt is not suspended, and (b) shows a state in which the V-ribbed belt is suspended only between the geared motor and the first conveying roller (drive roller). [Figure 6] 2A and 2B are explanatory diagrams illustrating the belt suspension path of the conveyor device of FIG. 1, where (a) shows a state in which only a V-ribbed belt is suspended between the drive rollers, and (b) shows a state in which only a round belt is suspended between the drive rollers. [Figure 7] FIG. 2 is an explanatory diagram illustrating the belt suspension paths of the conveyor device of FIG. 1, showing a state in which all belts are suspended. [Figure 8] FIG. 2 is a conceptual diagram showing a state in which a belt is suspended on a conveying roller. [Figure 9] FIG. 2 is a perspective view of a conveying roller of the conveyor device of FIG. 1. [Figure 10] FIG. 2 is an enlarged view of the conveying area of ​​the conveyor device of FIG. 1. [Figure 11] FIG. 10 is a plan view of a conveyor device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described. The conveyor device 1 of this embodiment is a short roller conveyor called a zone conveyor, and has a plurality of transport rollers 5 journaled at predetermined intervals between a pair of left and right side frames 2, 2 arranged in parallel. All of the conveying rollers 5 rotate freely. The conveying roller 5 has a conveying region 11 in which a plurality of roller members 50 are arranged in series, and a power transmission region 15 in which a pulley 12 is provided. In this embodiment, four pulleys 12 are used. That is, the pulleys 12 have four rows of grooves for winding a belt.

[0021] 2 and 5, a geared motor 16 is installed below the conveying roller 5, and a drive power transmission belt 17 (hereinafter simply referred to as drive belt 17) is wound around a pulley 18 installed on the geared motor 16 and a pulley 12 of the conveying roller 5 to drive the conveying roller 5a. In this embodiment, the pulley 18 installed on one geared motor 16 is a double pulley, and two conveying rollers 5a are rotated by one geared motor 16. Hereinafter, the conveying roller 5 that receives power transmission from the geared motor 16 via the drive belt 17 will be referred to as the first conveying roller 5a or drive roller. The other conveying rollers 5b to 5i are rotated by power transmitted directly or indirectly from the driving roller (first conveying roller) 5a. The conveying rollers 5b to 5i that are rotated by power transmission directly or indirectly from the driving roller (first conveying roller) 5a are called driven rollers, and are numbered starting from the driving roller (first conveying roller) 5a.

[0022] The conveyor device 1 of this embodiment has 18 transport rollers 5 arranged in parallel, with the two central transport rollers being the first transport rollers (drive rollers) 5a. That is, the conveyor system of the conveyor device 1 of this embodiment is divided into two roller groups from the center, with the first transport rollers 5a (drive rollers) in the right region and the first transport rollers 5a (drive rollers) in the left region. Focusing on the right region, the right first conveyor roller 5a (drive roller) through the right ninth conveyor roller 5i are present in this order. Focusing on the left region, the left first conveyor roller 5a (drive roller) through the left ninth conveyor roller 5i are present in this order.

[0023] In the conveyor device of this embodiment, the rotational force of the first conveying roller (drive roller) 5a belonging to each conveying system is transmitted to the driven rollers (the second conveying roller 5b to the ninth conveying roller 5i) via an interlocking power transmission belt (hereinafter simply referred to as the interlocking belt), causing all of the conveying rollers 5 to rotate.

[0024] The power transmission mechanism between the conveying rollers 5 will be described below. In the conveyor device 1 of this embodiment, two types of belts are used for power transmission between the conveying rollers 5. One type of belt is a V-ribbed belt 20 as shown in FIG. 8, and the other type of belt is a round belt 30. The V-ribbed belt 20 is a power transmission belt having multiple ribs that are connected in the circumferential direction. The V-ribbed belt 20 is made of rubber or resin and has a core 25 made of rope or wire built in. The V-ribbed belt 20 has a core 25 that has a small elongation rate and can withstand high tension. In other words, the V-ribbed belt 20 does not easily elongate even when subjected to a tensile force. The V-ribbed belt 20 can be suspended under high tension, resulting in high power transmission efficiency. On the other hand, it is not easy to suspend the V-ribbed belt 20 on pulleys with a short center distance.

[0025] The round belt 30 is made by extrusion molding of resin or the like and has a circular cross section. The round belt 30 is made entirely of resin and has no core wire. Since the round belt 30 does not have a core wire, it is made by extrusion molding of resin or the like. Therefore, it has a high elongation rate and cannot withstand high tension. In other words, the round belt 30 stretches when subjected to a pulling force. Since the round belt 30 cannot be suspended under high tension, its power transmission efficiency is low. On the other hand, the round belt 30 can be easily suspended over pulleys with a short center distance.

[0026] In the conveyor device 1 of this embodiment, the V-ribbed belt 20 is suspended on the conveyor rollers 5 arranged so as to straddle one of the conveyor rollers 5. That is, in this embodiment, four V-ribbed belts 20 and four round belts 30 are used in each of the left and right conveying systems. That is, the left and right conveying systems respectively use a first V-ribbed belt 20a, a second V-ribbed belt 20b, a third V-ribbed belt 20c, and a fourth V-ribbed belt 20d, and the left and right conveying systems respectively use a first round belt 30a, a second round belt 30b, a third round belt 30c, and a fourth round belt 30d.

[0027] As shown in FIGS. 3(b) and 6(a), the V-ribbed belt 20a is suspended across one conveyor roller. For example, the first V-ribbed belt 20a is suspended across the first conveyor roller 5a and the third conveyor roller 5c, and is suspended across the second conveyor roller 5b sandwiched between them. The second V-ribbed belt 20b is suspended across the third conveyor roller 5c and the fifth conveyor roller 5e, and is suspended across the fourth conveyor roller 5d sandwiched between them. The third V-ribbed belt 20c is suspended across the fifth conveyor roller 5e and the seventh conveyor roller 5g, and is suspended across the sixth conveyor roller 5f sandwiched between them. The fourth V-ribbed belt 20d is suspended across the seventh conveyor roller 5g and the ninth conveyor roller 5i, and is suspended across the eighth conveyor roller 5h sandwiched between them. Each V-ribbed belt 20 is suspended between opposing pulleys with a conveying roller 5 sandwiched therebetween, so the distance between the axes of the suspended pulleys is long. Therefore, although the V-ribbed belt 20 is not easily stretched, it can be suspended between two pulleys and can transmit power efficiently.

[0028] As shown in Figures 4(a) and 6(b), the round belt 30a is suspended on the pulleys of the adjacent conveying rollers 5. More specifically, the round belt 30a is suspended between the conveying rollers 5a, 5c, 5e, and 5g on which the V-ribbed belt 20 is suspended and the conveying rollers 5b, 5d, 5f, and 5h which are one number higher. Specifically, a first round belt 30a is suspended between the first conveyor roller 5a and the second conveyor roller 5b. A second round belt 30b is suspended between the third conveyor roller 5c and the fourth conveyor roller 5d. A third round belt 30c is suspended between the fifth conveyor roller 5e and the sixth conveyor roller 5f. A fourth round belt 30d is suspended between the seventh conveyor roller 5g and the eighth conveyor roller 5h. Although the distance between the axes of the pulleys of the adjacent conveying rollers 5 is short, the round belt 30 is easily stretchable and can be easily suspended.

[0029] In this way, the V-ribbed belt 20, which is difficult to stretch, is engaged with every other conveying roller 5, and can be suspended because the center distance between the pulleys is long. The pulleys with which the round belt 30 engages have a short center distance, but the round belt 30 allows stretching, so it can be wound around.

[0030] In the conveyor device 1 of this embodiment, as shown in Figure 7, power is transmitted from the first conveyor roller 5a, which serves as a drive roller, to the third conveyor roller 5c via the first V-ribbed belt 20a, and then from the third conveyor roller 5c to the fifth conveyor roller 5e via the second V-ribbed belt 20b, and from the fifth conveyor roller 5e to the seventh conveyor roller 5g via the third V-ribbed belt 20c, and from the seventh conveyor roller 5g to the ninth conveyor roller 5i via the fourth V-ribbed belt 20d.

[0031] Therefore, the odd-numbered driven rollers, the third conveyor roller 5c, the fifth conveyor roller 5e, the seventh conveyor roller 5g, and the ninth conveyor roller 5i, receive power directly or indirectly from the first conveyor roller 5a, the drive roller, only via the low-slip V-ribbed belt 20. Therefore, the odd-numbered conveyor rollers, the first conveyor roller 5a, the third conveyor roller 5c, the fifth conveyor roller 5e, the seventh conveyor roller 5g, and the ninth conveyor roller 5i, rotate at approximately the same speed with little decrease in rotational speed. In other words, the third conveyor roller 5c, the fifth conveyor roller 5e, the seventh conveyor roller 5g, and the ninth conveyor roller 5i, the driven rollers, rotate at approximately the same speed as the first conveyor roller 5a, the drive roller.

[0032] The even-numbered conveying rollers, the second conveying roller 5b, the fourth conveying roller 5d, the sixth conveying roller 5f, and the eighth conveying roller 5h, are driven by the round belt 30, which has a large amount of slippage, but because they receive power directly from the odd-numbered conveying rollers 5a, 5c, 5e, and 5g, which have a small decrease in rotational speed, there is no cumulative deceleration rate and no significant change in rotational speed.As a result, the second conveying roller 5b, the fourth conveying roller 5d, the sixth conveying roller 5f, and the eighth conveying roller 5h, which are driven rollers, rotate at approximately the same speed as the first conveying roller 5a, which is the drive roller.

[0033] In the embodiment described above, the V-ribbed belt 20 is used as a belt having a core wire 25 and little stretch, and the round belt 30 is used as a belt having no core wire and great stretch. Other belts with a core and little stretch include toothed belts and V-belts, while other belts without a core and with a lot of stretch include hexagonal belts and rope belts, in addition to round belts.

[0034] The pulley groove has a preferred cross-sectional shape and width depending on the type of belt. Therefore, it is possible to shape the cross-sectional shape and groove width of the pulley to match the belt that engages with it. For example, in the above-described embodiment, the conveying roller is equipped with a pulley, and the pulley is four in number, with four rows of grooves. The pulley has a groove that engages with the V-ribbed belt 20 and a groove that engages with the round belt 30. Therefore, it is desirable to mold the groove that engages with the V-ribbed belt 20 into a groove shape that matches the V-ribbed belt 20, and to mold the groove that engages with the round belt 30 into a groove shape that matches the round belt 30.

[0035] In the embodiment described above, the belt having a core wire and having little stretch is suspended across one conveying roller, but it may also be suspended across two or more conveying rollers.

[0036] Next, the conveying roller 5 and other components employed in this embodiment will be described. As shown in FIG. 9, the transport roller 5 used in the conveyor device 1 of this embodiment has holding members 52 at both ends, a pulley member 53 inside the holding member 52 at one end, and a transport section 55 in the middle.

[0037] As shown in Figure 9, the conveying section 55 is configured by connecting a plurality of roller members 50 and spacing members 56, 57, and 58 in series, with a rotation core (shaft member) 65 inserted through these members. The aforementioned pulley member 53 and the plurality of roller members 50 and spacing members 56, 57, and 58 that make up the conveying section 55 are engaged with each other at adjacent members, and rotate integrally. The rotation core (shaft member) 65 is also engaged with the aforementioned members and the pulley member 53, and are integrated in the rotation direction. Therefore, when the pulley member 53 rotates, the rotation core (shaft member) 65, the plurality of roller members 50, and spacing members 56, 57, and 58 rotate integrally.

[0038] In the conveyor device 1 of this embodiment, the conveying rollers 5 have a large diameter portion where the roller members 50 are located and a small diameter portion formed by the intermediate spacing member 57, and the large diameter portion of a specific conveying roller 5 is located at a position corresponding to the small diameter portion of an adjacent conveying roller 5, and the small diameter portion of a specific conveying roller 5 is located at a position corresponding to the large diameter portion of an adjacent conveying roller 5, and the axis-to-axis distance between adjacent conveying rollers 5 is shorter than the diameter of the large diameter portion.

[0039] Therefore, in the conveyor device 1 of this embodiment, the transport rollers 5 are arranged closely, and there are many opportunities for the transported objects to come into contact with the transport rollers 5, making the transported objects less likely to rattle. Therefore, the shock to the transported objects is small.

[0040] As shown in FIG. 10, the external appearance of the conveying roller 5 is such that large diameter portions 121 and small diameter portions 122 are alternately provided around the central shaft. The large diameter portions 121 have a hollow structure. Because the conveying roller 5 has a cavity inside, the roller members easily deform when an object collides with them, cushioning the impact of the collision. Therefore, even if an object collides with it, noise is unlikely to be generated. In addition, the conveying portion is unlikely to be damaged. In the conveyor device 1 of this embodiment, both ends of a conveying roller 5 are rotatably supported by the side frames 2 facing each other. In the conveyor device 1, the conveying rollers 5 are arranged closely together, and the large diameter portion 121 of one of the adjacent conveying rollers 5 is positioned in the position of the small diameter portion 122 of the other conveying roller 5. 10, the conveyor device 1 has a short inter-axial distance L between adjacent transport rollers 5. As shown in FIG. 10, when the diameter of the large diameter portion 121 is D, the inter-axial distance L is smaller than the diameter D of the large diameter portion 121. If the diameter of the small diameter portion 122 is d, then (D+d) / 2 is slightly smaller than the center distance L. That is, (D+d) / 2 is 70 percent or more of the center distance L, and more preferably 80 percent or more.

[0041] Therefore, the gap Sa between the small diameter portion 122 and the large diameter portion 121 of adjacent conveying rollers 5 is extremely small, and the gap Sa is 15% or less of the diameter D of the large diameter portion 121, and more preferably 10% or less.

[0042] Furthermore, when the length of large diameter portion 121 is A and the length of small diameter portion 122 is B, length A of large diameter portion 121 is slightly smaller than length B of small diameter portion 122. That is, the length A of the large diameter portion 121 is 70 percent or more of the length of the small diameter portion 122, and more preferably 80 percent or more. Therefore, the gap Sb in the axial direction between the large diameter portions 121 of the adjacent conveying rollers 5 is extremely small. Therefore, the conveyor device 1 has few gaps overall and is in a dense state.

[0043] Although not limited thereto, the diameter D of the large diameter portion 121 is about 25 mm to 80 mm, and preferably about 30 mm to 60 mm. The gap Sa between the small diameter portion 122 and the large diameter portion 121 of the adjacent conveying rollers 5 is 10 mm or less, and preferably 3 mm or less.

[0044] In the conveyor device 1 of this embodiment, the transport rollers 5 are arranged closely, which increases the chances of the transported object coming into contact with the transport rollers 5 and makes the transported object less likely to rattle. In addition, since the conveyor device 1 of this embodiment has small gaps, even when transporting an object with a small outer shape, the object is less likely to fall between the transport rollers 5.

[0045] The transmission mechanism employed in the conveyor device of the present invention is suitable for conveyor devices with narrow spacing between the conveying rollers 5 and short center distances between the pulleys, but it can also be used in conveyor devices that use ordinary cylindrical rollers. Furthermore, the present invention is not limited to linear conveyors, but can also be applied to curved conveyor devices.

[0046] In the embodiment described above, four pulleys 12 are provided on one end of the conveying roller 5 as shown in FIG. 1, but pulleys 12 may be provided on both ends of the conveying roller 5 as shown in FIG. The number of grooves in the pulley does not have to be four. For example, a pulley with three grooves may be used. Also, if a cylindrical roller is used, the belt may be wound directly around the roller body. [Explanation of symbols]

[0047] 1 Conveyor equipment 5 Conveyor roller 12 pulleys 17 Power transmission belt for driving 20 V-ribbed belt 30 round belt

Claims

1. A conveyor device having a plurality of conveying rollers, the conveying rollers being power-transmitted to one another by a belt to rotate a group of conveying rollers, A conveyor device in which power is transmitted by different types of belts, one type of belt being suspended across one or more conveying rollers, and another type of belt being suspended across adjacent conveying rollers.

2. 2. The conveyor device according to claim 1, wherein the different types of belts have different elongation rates, and a belt with a low elongation rate is suspended across one or more conveyor rollers, and a belt with a high elongation rate is suspended across an adjacent conveyor roller.

3. 2. The conveyor device according to claim 1, wherein the different types of belts are a belt with a core and a belt without a core, the belt with a core being suspended across one or more conveying rollers, and the belt without a core being suspended across an adjacent conveying roller.

4. 4. The conveyor device according to claim 1, wherein the combination of different types of belts is a combination of any one of the belts in the first group and any one of the belts in the second group, wherein any one of the belts in the first group is suspended across one or more conveying rollers, and any one of the belts in the second group is suspended across an adjacent conveying roller. 1st group (1) Toothed belt (2) V-ribbed belt (3) V-belt 2nd group (1) Round belt (2) Hexagonal belt (3) Rope belt

5. 4. The conveyor device according to claim 1, wherein the conveying roller has a pulley around which a belt is suspended, and two types of pulley grooves are provided on one conveying roller.

Images