Cap detaching device

Abstract

The application relates to a cover body dismounting device which comprises an assembling part, a rotating part and a positioning part, the assembling part is used for assembling with a carrier roller; the rotating part is provided with a first holding part, a rotating part and a connecting part, the first holding part, the rotating part and the connecting part are sequentially arranged along the first direction of the rotating part, and the rotating part is rotatably connected with the assembling part; and the positioning part is arranged on the connecting part and is used for assembling with the cover body. Compared with the traditional technology, the cover body dismounting device can save labor and simplify the dismounting process when workers dismount the cover body, so that the dismounting efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of cigarette equipment maintenance, and in particular to a cover removal device. Background Technology

[0002] In the cigarette production process, conveyor belts are usually used in cigarette equipment to transport cigarettes or raw materials used to manufacture cigarettes. The conveyor belt includes idlers and belts. The idlers and belts come into frictional contact and rotate to support the belts.

[0003] Bearings are usually installed inside the idler roller to improve its stability during rotation. To prevent cigarette ash from entering the idler roller during the cigarette production process and hindering the normal movement of the bearing, a cover is usually installed on the end face of the idler roller. When maintenance personnel need to replace the bearing inside the idler roller, the cover needs to be removed. However, the process of removing the cover is cumbersome, which leads to a decrease in the efficiency of bearing replacement. Utility Model Content

[0004] Therefore, it is necessary to provide a cover disassembly device to address the problem that the disassembly and assembly process of the cover in traditional technology is cumbersome, resulting in low efficiency in replacing the bearings inside the idler roller.

[0005] The technical solution is as follows:

[0006] One embodiment provides a cover removal device, comprising:

[0007] An assembly for assembling with an idler roller;

[0008] A rotating component, comprising a first gripping portion, a rotating portion, and a connecting portion, wherein the first gripping portion, the rotating portion, and the connecting portion are sequentially arranged along a first direction of the rotating component, and the rotating portion is rotatably connected to the assembly; and

[0009] A positioning element is provided on the connecting portion and is used for assembly with the cover.

[0010] In use of the aforementioned cover removal device, the assembly parts are first assembled with the roller, and then the positioning part is positioned on the roller. Subsequently, the operator holds the first gripping part and controls the rotating part to rotate around the rotating part, so that the positioning part located at the connecting part can drive the cover to move and gradually move away from the roller, thereby removing the cover from the roller. Compared with traditional technology, the operator can remove the cover more effort and simplify the disassembly process when using the aforementioned cover removal device, thereby improving disassembly efficiency.

[0011] In one embodiment, the positioning member includes a plug portion for engaging with a plug hole in the cover.

[0012] In one embodiment, the plug portion is rotatably disposed on the connecting portion, the plug portion having a limiting groove, the bottom wall of the limiting groove being used to abut against the wall of the plug hole.

[0013] In one embodiment, the positioning element further includes a torsion spring, one end of which is connected to the connecting portion and the other end of which is connected to the insertion portion. The torsion spring is used to apply an elastic force to the insertion portion to move the bottom wall of the limiting groove toward the wall of the insertion hole.

[0014] In one embodiment, the positioning member further includes a mounting shaft, the insertion portion includes a mounting ring and a insertion rod, the mounting shaft passes through the mounting ring and is connected to the connecting portion, the insertion rod is connected to the mounting ring, and the limiting groove is formed on the outer side wall of the insertion rod.

[0015] In one embodiment, at least two plug-in portions are provided, and all the plug-in portions are spaced apart from each other along the circumference of the cover in the connecting portion.

[0016] In one embodiment, the connecting portion includes a connecting ring, and all the plug portions are spaced apart circumferentially on the inner or outer ring surface of the connecting ring.

[0017] In one embodiment, the rotating member includes a rotating rod, and the first gripping part, the rotating part, and the connecting part are sequentially disposed on the rotating rod along the first direction of the rotating rod. The assembly part includes an assembly rod, and the assembly rod is sequentially disposed with a second gripping part, a rotating mating part, and an assembly part along its own second direction. The rotating mating part is rotatably connected to the rotating part, and the assembly part is used for assembly with the idler roller.

[0018] In one embodiment, the assembly includes an assembly ring for assembling with the outer side wall of the idler roller.

[0019] In one embodiment, the assembly ring is provided with an assembly step, the assembly step having a first step surface and a second step surface arranged adjacent to each other, the first step surface being used to abut against the outer side wall of the idler roller, and the second step surface being used to abut against the end face of the idler roller. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the cover removal device removing the cover in one embodiment of this application.

[0022] Figure 2 This is a schematic diagram of the overall structure of the cover removal device in one embodiment of this application.

[0023] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0024] Figure 4 This is a schematic diagram of the assembly of the roller and the cover in one embodiment of this application.

[0025] Figure 5 This is a schematic diagram of the cover being removed from the roller in one embodiment of this application.

[0026] Attached image annotations:

[0027] 100. Assembly part; 110. Second gripping part; 120. Rotating mating part; 130. Assembly part; 131. Assembly ring; 140. Assembly step; 141. First step surface; 142. Second step surface; 200. Rotating part; 210. First gripping part; 220. Rotating part; 230. Connecting part; 231. Connecting ring; 300. Positioning part; 310. Insertion part; 311. Mounting ring; 312. Insertion rod; 320. Limiting groove; 330. Mounting shaft; 10. Idler roller; 20. Cover; 21. Insertion hole. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] Please see Figures 1 to 2One embodiment of this application provides a cover removal device, including an assembly 100, a rotating member 200, and a positioning member 300. The assembly 100 is used to assemble with a roller 10. The rotating member 200 is provided with a first gripping part 210, a rotating part 220, and a connecting part 230. The first gripping part 210, the rotating part 220, and the connecting part 230 are arranged sequentially along a first direction of the rotating member 200. The rotating part 220 is rotatably connected to the assembly 100. The positioning member 300 is provided on the connecting part 230 and is used to assemble with the cover 20.

[0035] When using the above-mentioned cover removal device, first assemble the assembly 100 with the roller 10, then position the positioning part 300 with the cover 20 on the roller 10. Subsequently, the operator holds the first gripping part 210 and controls the rotating part 200 to rotate around the rotating part 220, so that the positioning part 300 located on the connecting part 230 can drive the cover 20 to move and gradually move away from the roller 10, thereby removing the cover 20 from the roller 10. Compared with traditional technology, the operator can remove the cover 20 more easily and simplify the removal process when using the above-mentioned cover removal device, thereby improving the removal efficiency.

[0036] Understandably, the assembly 100 can be assembled or disassembled with the idler roller 10, and the positioning component 300 can also be assembled or disassembled with the idler roller 10.

[0037] For explanation purposes, the rotating member 200 can be rod-shaped, and the first direction is the length direction of the rod-shaped rotating member 200, that is... Figure 2 The direction B in the diagram will not be elaborated upon here.

[0038] In addition, the end of the idler roller 10 is provided with an installation port, and the cover 20 can be placed on the installation port to prevent cigarette ash from entering the interior of the idler roller 10 during the cigarette production process and hindering the normal movement of the bearing; the cover 20 can be removed from the installation port at the end of the idler roller 10 by the cover removal device in this embodiment, so as to facilitate the maintenance and replacement of the bearing inside the idler roller 10.

[0039] Furthermore, the first gripping part 210, the rotating part 220, and the connecting part 230 are arranged sequentially along the first direction of the rotating member 200, that is, the rotating part 220 is located between the first gripping part 210 and the connecting part 230. In this way, when the worker grips the first gripping part 210, the rotating part 220 can be used as the fulcrum of the rotating member 200, thereby using the lever principle to drive the cover 20 away from the idler roller 10, and then remove the cover 20 from the idler roller 10, making the disassembly process less strenuous.

[0040] Furthermore, the distance between the first gripping part 210 and the rotating part 220 is greater than the distance between the connecting part 230 and the rotating part 220, so that when the rotating member 200 rotates, the power arm can be greater than the resistance arm, thereby achieving the effect of saving effort.

[0041] Optionally, the positioning component 300 can be attached to one side of the cover 20 by a suction cup to remove the cover 20 from the roller 10. The positioning component 300 can also be positioned with the cover 20 by other means such as bonding or insertion, which is not specifically limited here.

[0042] Alternatively, the assembly 100 can also be assembled with the idler roller 10 by means of bonding, plugging or snapping, etc., without specific limitations here.

[0043] Please see Figure 1 , Figure 2 , Figure 4 and Figure 5 In one embodiment, the positioning member 300 includes a plug-in portion 310 for engaging with the plug-in hole 21 of the cover 20.

[0044] The insertion part 310 can be inserted into the insertion hole 21 on the cover 20. Thus, when the rotating part 200 rotates, the insertion part 310 can drive the cover 20 to move and remove the cover 20 from the roller 10. Assembly is achieved by the insertion part 310 and the insertion hole 21 on the cover 20. After the cover 20 is removed from the roller 10, the insertion part 310 can be easily pulled out from the insertion hole 21. The operation process is simple.

[0045] In one embodiment, the insertion part 310 can generate friction with the wall of the insertion hole 21 to prevent the insertion part 310 from falling out of the insertion hole 21, thereby enabling the insertion part 310 to drive the cover 20 to move.

[0046] Please see Figures 1 to 3 In one embodiment, the insertion part 310 is rotatably disposed on the connecting part 230, and the insertion part 310 has a limiting groove 320, the bottom wall of the limiting groove 320 being used to abut against the hole wall of the insertion hole 21.

[0047] The insertion part 310 is rotatably provided on the connecting part 230. Thus, the angle of the insertion part 310 can be adjusted by rotating the insertion part 310 so that the insertion part 310 can smoothly enter the insertion hole 21 of the cover 20. Then, by rotating the insertion part 310 again, the bottom wall of the limiting groove 320 on the insertion part 310 abuts against the hole wall of the insertion hole 21, thereby locking the outer edge of the limiting hole into the limiting groove 320. Thus, when the rotating member 200 drives the insertion part 310 to move, the limiting groove 320 can achieve a certain limiting effect on the outer edge of the insertion hole 21 to prevent the cover 20 from moving relative to the insertion part 310, thereby removing the cover 20 from the roller 10.

[0048] Furthermore, the sidewall of the limiting groove 320 can abut against the outer edge of the insertion hole 21 to prevent the outer edge of the insertion hole 21 from falling off the limiting groove 320, thereby preventing the cover 20 from falling off the insertion part 310 and improving the stability when disassembling the cover 20.

[0049] Please see Figure 2 In one embodiment, the positioning member 300 further includes a torsion spring (not shown in the figure), one end of which is connected to the connecting portion 230 and the other end of which is connected to the insertion portion 310. The torsion spring is used to apply an elastic force to the insertion portion 310 to move the bottom wall of the limiting groove 320 toward the wall of the insertion hole 21.

[0050] Under the action of the torsion spring, the insertion part 310 tends to rotate in one direction, so that the bottom wall of the limiting groove 320 on the insertion part 310 tends to move towards the hole wall of the insertion hole 21. This ensures that when the rotating part 200 rotates, the bottom wall of the limiting groove 320 can always abut against the hole wall of the insertion hole 21, preventing the hole wall of the insertion hole 21 from falling out of the limiting groove 320 and improving the reliability of the cover disassembly device.

[0051] Furthermore, the torsion spring is used to apply an elastic force to the insertion part 310 to rotate the insertion part 310 in the direction in which the groove of the limiting groove 320 is facing.

[0052] Please see Figure 3 In one embodiment, the positioning member 300 further includes a mounting shaft 330, the insertion part 310 includes a mounting ring 311 and an insertion rod 312, the mounting shaft 330 passes through the mounting ring 311 and is connected to the connecting part 230, the insertion rod 312 is connected to the mounting ring 311, and the limiting groove 320 is formed on the outer side wall of the insertion rod 312.

[0053] The mounting ring 311 can rotate around the mounting shaft 330, thereby driving the insertion rod 312 to rotate.

[0054] Furthermore, one end of the torsion spring is connected to the connecting part 230, and the other end of the torsion spring is connected to the mounting ring 311. The axial direction of the torsion spring is collinear with the axial direction of the mounting ring 311, so that the elastic force of the torsion spring can drive the mounting ring 311 to rotate along its own axial direction.

[0055] Please see Figure 2 and Figure 3 In one embodiment, at least two plug-in portions 310 are provided, and all plug-in portions 310 are spaced apart along the circumferential direction of the cover 20 at the connecting portion 230.

[0056] By providing at least two insertion parts 310, different insertion parts 310 can be inserted into different insertion holes 21 on the cover 20 respectively, so as to ensure the assembly reliability between the positioning member 300 and the cover 20.

[0057] Furthermore, the cover 20 is provided with at least two insertion holes 21, and the number of insertion parts 310 corresponds one-to-one with the number of insertion holes 21.

[0058] Please see Figure 3 In one embodiment, the connecting portion 230 includes a connecting ring 231, and all the plug portions 310 are spaced apart along the circumference of the cover 20 on the inner or outer ring surface of the connecting ring 231.

[0059] The insertion holes 21 on the cover 20 are usually spaced around the outer periphery of the cover 20. The shape of the connecting ring 231 can roughly match the shape of the cover 20 so that the insertion part 310 corresponding to the insertion hole 21 can be provided on the connecting ring 231.

[0060] exist Figure 3 In the embodiment shown, the plug portion 310 is provided on the inner ring surface of the connecting ring 231, thereby protecting the plug portion 310 through the connecting ring 231.

[0061] Optionally, the connecting ring 231 can be a complete ring, or a half ring or a quarter ring, as long as there is enough space for the insertion part 310, and no specific limitation is made here.

[0062] Furthermore, in Figure 3 In the embodiment shown, the connecting ring 231 has a semi-circular structure, and the insertion part 310 has two parts that are arranged opposite to each other at the two ends of the semi-circular connecting ring 231. In this way, the assembly reliability between the positioning part 300 and the cover 20 can be improved, while the overall weight of the cover disassembly device can be reduced.

[0063] Please see Figure 1 and Figure 2In one embodiment, the rotating member 200 includes a rotating rod, a first gripping part 210, a rotating part 220 and a connecting part 230 are sequentially disposed on the rotating rod along a first direction, and the assembly part 100 includes an assembly rod, and the assembly rod is sequentially disposed along its second direction with a second gripping part 110, a rotating mating part 120 and an assembly part 130, the rotating mating part 120 and the rotating part 220 being rotatably connected, and the assembly part 130 being used for assembly with the idler roller 10.

[0064] With this configuration, the operator can hold the first grip 210 and the second grip 110 to control the rotation of the rotating rod relative to the assembly rod, which is labor-saving and easy to operate.

[0065] Furthermore, the first direction of the rotating rod is the axial direction of the rotating rod (i.e., Figure 2 The second direction of the assembly rod is the axial direction of the assembly rod (i.e., direction B in the equation). Figure 2 (in the C direction), which will not be elaborated here.

[0066] Please see Figure 1 and Figure 2 In one embodiment, a first gripping part 210 is disposed at one end of the rotating rod, a connecting part 230 is disposed at the other end of the rotating rod, and a rotating part 220 is disposed between the connecting part 230 and the first gripping part 210 and is disposed close to the connecting part 230; a second gripping part 110 is disposed at one end of the assembly rod, an assembly part 130 is disposed at the other end of the assembly rod, and a rotating mating part 120 is disposed between the assembly part 130 and the second gripping part 110 and is disposed close to the assembly part 130, so that the power arm of the lever formed by the rotating rod and the assembly rod is greater than the resistance arm, thereby achieving the effect of saving effort.

[0067] Furthermore, the first grip 210 can be part of the rotating rod itself, and the second grip 110 can be part of the mounting rod itself.

[0068] Please see Figure 3 In one embodiment, the rotating part 220 has a first through hole, the rotating mating part 120 has a second through hole, and the cover disassembly device further includes a connecting component that can pass through the first through hole and the second through hole to realize the rotational mating between the rotating part 220 and the rotating mating part 120.

[0069] Please see Figure 1 and Figure 3 In one embodiment, the assembly portion 130 includes an assembly ring 131 for assembling with the outer side wall of the idler roller 10.

[0070] The shape of the assembly ring 131 can match the shape of the outer wall of the idler roller 10 to improve the assembly effect between the assembly ring 131 and the idler roller 10.

[0071] Optionally, the assembly ring 131 can be a complete ring, or a half ring or a quarter ring, as long as it can be solidly assembled with the idler roller 10. No specific limitation is made here.

[0072] Furthermore, in Figure 3 In the embodiment shown, the assembly ring 131 is a semi-circular structure with an opening, so that the idler roller 10 can be assembled with the assembly ring 131 through the opening.

[0073] Please see Figure 3 In one embodiment, the assembly ring 131 is provided with an assembly step 140, the assembly step 140 having a first step surface 141 and a second step surface 142 arranged adjacent to each other, the first step surface 141 being used to abut against the outer side wall of the idler roller 10, and the second step surface 142 being used to abut against the end face of the idler roller 10.

[0074] The first step surface 141 and the second step surface 142 of the assembly step 140 are respectively used to abut against the outer side wall and end face of the roller 10 to improve the assembly stability between the assembly ring 131 and the roller 10 and prevent displacement between the assembly ring 131 and the roller 10 from affecting the disassembly process of the cover 20.

[0075] Furthermore, the first step surface 141 and the second step surface 142 of the mounting step 140 are perpendicular to each other to match the outer wall and end face of the idler roller 10.

[0076] Furthermore, the first step surface 141 is disposed facing the outer side wall of the idler roller 10, and the second step surface 142 is disposed facing the cross section of the idler roller 10, so as to realize the assembly between the idler roller 10 and the idler roller 10.

[0077] For illustrative purposes, the idler roller 10 is a cylindrical component. In the above embodiment, the end face of the idler roller 10 is an annular surface at one end of the cylindrical component. Correspondingly, the second step surface 142 is also an annular surface to match the end face of the idler roller 10.

[0078] Furthermore, the cover 20 is installed at one end of the cylindrical roller 10 and located inside the annular surface. In this way, by setting the second step surface 142 as an annular surface that matches the end face, it is possible to avoid the second step surface 142 abutting against the cover 20 and thus preventing it from hindering the disassembly process of the cover 20.

[0079] Please see Figure 3In one embodiment, the first step surface 141 faces the side away from the positioning member 300. Thus, when the operator controls the rotating member 200 to rotate and disassemble the cover 20, the first step surface 141 can abut against the end face of the roller 10. When the cover 20 moves away from the first step surface 141 under the drive of the positioning member 300, the end face of the roller 10 generates a reaction force on the first step surface 141, thereby supporting the rotating member 200 and improving the ease of disassembling the cover 20.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A cover disassembly device, characterized in that, include: An assembly for assembling with an idler roller; A rotating component, comprising a first gripping portion, a rotating portion, and a connecting portion, wherein the first gripping portion, the rotating portion, and the connecting portion are sequentially arranged along a first direction of the rotating component, and the rotating portion is rotatably connected to the assembly; and A positioning element is provided on the connecting portion and is used for assembly with the cover.

2. The cover disassembly device according to claim 1, characterized in that, The positioning element includes a plug-in portion for engaging with the plug-in hole of the cover.

3. The cover disassembly device according to claim 2, characterized in that, The plug portion is rotatably disposed on the connecting portion, and the plug portion has a limiting groove, the bottom wall of the limiting groove being used to abut against the wall of the plug hole.

4. The cover disassembly device according to claim 3, characterized in that, The positioning component also includes a torsion spring, one end of which is connected to the connecting portion and the other end of which is connected to the insertion portion. The torsion spring is used to apply an elastic force to the insertion portion to move the bottom wall of the limiting groove toward the wall of the insertion hole.

5. The cover disassembly device according to claim 3, characterized in that, The positioning component further includes a mounting shaft, the insertion part includes a mounting ring and an insertion rod, the mounting shaft passes through the mounting ring and is connected to the connecting part, the insertion rod is connected to the mounting ring, and the limiting groove is formed on the outer side wall of the insertion rod.

6. The cover disassembly device according to claim 2, characterized in that, The plug-in portion is provided in at least two parts, and all the plug-in portions are arranged at intervals along the circumference of the cover in the connecting portion.

7. The cover disassembly device according to claim 6, characterized in that, The connecting part includes a connecting ring, and all the plug-in parts are spaced apart along the circumference of the cover on the inner or outer ring surface of the connecting ring.

8. The cover disassembly device according to claim 1, characterized in that, The rotating component includes a rotating rod, and the first gripping part, the rotating part, and the connecting part are sequentially arranged on the rotating rod along the first direction of the rotating rod. The assembly part includes an assembly rod, and the assembly rod is sequentially arranged with a second gripping part, a rotating mating part, and an assembly part along its own second direction. The rotating mating part is rotatably connected to the rotating part, and the assembly part is used for assembly with the idler roller.

9. The cover disassembly device according to claim 8, characterized in that, The assembly part includes an assembly ring for assembling with the outer side wall of the idler roller.

10. The cover disassembly device according to claim 9, characterized in that, The assembly ring is provided with an assembly step, the assembly step having a first step surface and a second step surface arranged adjacent to each other, the first step surface being used to abut against the outer side wall of the idler roller, and the second step surface being used to abut against the end face of the idler roller.

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