Via roller and die-cutting machine

Abstract

The utility model provides a passing roller and a die-cutting machine, and belongs to the technical field of battery processing. The passing roller comprises a shaft body, a first connecting roller, a second connecting roller and a first limiting piece; the first connecting roller sleeves the shaft body and is rotationally connected with the shaft body; the second connecting roller is arranged on the first connecting roller in a sleeving manner, so that a first avoiding part is defined at the end part of the second connecting roller and one side, deviating from the shaft body, of the first connecting roller; first limiting pieces are arranged at the two ends of the second connecting roller in the axis direction, the first limiting pieces are connected with the second connecting roller and abut against the first avoiding parts, and second avoiding parts are defined by the sides, away from the first connecting roller, of the first limiting pieces and the ends of the second connecting roller. According to the passing roller provided by the invention, the second avoiding part is defined by one side, deviating from the first connecting roller, of the first limiting piece and the end part of the second connecting roller, so that a height difference is formed at the two ends of the second connecting roller, and the tab can be avoided.

Description

Technical Field

[0001] The present application relates to the field of battery processing technology, and in particular to a roller and die-cutting machine. Background Art

[0002] In the production process of lithium batteries, laser die-cutting is a key process in battery forming. The die-cutting machine cuts the pole roll into the shape of pole ears and pole pieces according to the cell process requirements. The roller is an indispensable auxiliary device of the die-cutting machine. The pole piece must be reeled after passing through the roller.

[0003] The length of the roller of a traditional laser die-cutting machine is generally greater than the width of the electrode piece and cannot be moved. Due to the particularity of the negative electrode material, the pole ear sags due to its own weight and collides with the roller surface when passing through the roller, resulting in quality abnormalities such as bending and folding of the pole ear. Conventional rollers cannot avoid the pole ear from being empty. Utility Model Content

[0004] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and provide a roller and die-cutting machine.

[0005] In a first aspect, the present application provides a roller having an axial direction, comprising:

[0006] Axis body;

[0007] A first connecting roller, sleeved on the shaft body and rotatably connected to the shaft body;

[0008] a second connecting roller, sleeved on the first connecting roller, an end of the second connecting roller and a side of the first connecting roller away from the shaft body defining a first avoidance portion, and the second connecting roller is used to convey the pole piece;

[0009] The first limit member is arranged near the end of the second connecting roller along its axial direction and is located in the first avoidance portion. The first limit member is connected to the first avoidance portion. The side of the first limit member facing away from the first connecting roller and the end of the second connecting roller define a second avoidance portion. The second avoidance portion is used to avoid the pole ear.

[0010] In some embodiments, along the axial direction, the roller further includes a bearing, the bearing is sleeved on the shaft body, and the first connecting roller is rotatably connected to the shaft body through the bearing.

[0011] In some embodiments, the roller further includes two second stoppers, and the number of the bearings is two, which are respectively located at two ends of the first connecting roller along the axis;

[0012] The two second position-limiting members are respectively arranged corresponding to the two bearings, and the two second position-limiting members are both fixedly connected to the shaft body.

[0013] In some embodiments, along a direction perpendicular to the axis, the distance from the side of the second limiting member facing away from the shaft body to the shaft body is less than the distance from the side of the bearing facing away from the shaft body to the shaft body.

[0014] In some embodiments, third limiting portions are respectively provided at both ends of the first connecting roller, and the third limiting portion has a first wall surface and a second wall surface connected to each other;

[0015] The first wall surface abuts against the side of the outer ring of the bearing facing away from the shaft body, and the second wall surface abuts against the side of the outer ring of the bearing facing away from the second limiting member.

[0016] In some embodiments, the distance from the side of the first limiting member facing away from the first connecting roller to the first connecting roller is less than the distance from the side of the second connecting roller facing away from the first connecting roller to the first connecting roller.

[0017] In some embodiments, the over-roller includes a bolt;

[0018] A plurality of threaded holes are provided at the end of the second connecting roller, and the plurality of threaded holes are evenly spaced along the circumferential direction of the second connecting roller. The threaded end of the bolt passes through the first limiting member and is threadedly connected to the threaded hole.

[0019] In some embodiments, a through hole is vertically penetratingly provided on the first limiting member, and the over-roller includes a connecting member. The end of the connecting member passes through the through hole and is connected to the first connecting roller.

[0020] In some embodiments, the number of the through holes is multiple, and the multiple through holes are evenly spaced along the circumferential direction of the first limiting member.

[0021] In a second aspect, the present application provides a die-cutting machine including the above-mentioned over-roller.

[0022] The embodiments of the present application have the following advantages: The second connecting roller is connected to the first connecting roller through the first limiting member, and the first limiting member abuts against the first avoiding portion, so as to form a limiting effect on the second connecting roller through the first limiting member, which can not only improve the connection stability between the second connecting roller and the first connecting roller, but also define a second avoiding portion between the side of the first limiting member facing away from the first connecting roller and the end of the second connecting roller, so as to form a height difference at both ends of the second connecting roller, thereby avoiding the tab; in addition, by disassembling and assembling the second connecting roller from the first connecting roller, the conversion between the avoiding function and the over-roller function is realized, thereby reducing the production cost and improving the production efficiency.

[0023] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. Description of the Drawings

[0024] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0025] Figure 1 Fig. 6 shows a schematic structural view of a perspective of a roll in some embodiments of the present application;

[0026] Figure 2 Fig. 10 shows a schematic structural view of another perspective of a roll in some embodiments of the present application;

[0027] Figure 3 shows Figure 2 a cross-sectional view of the A-A portion in

[0028] Figure 4 Fig. 20 shows an exploded view of a roll in some embodiments of the present application;

[0029] Figure 5 Fig. 24 shows a schematic structural view of a perspective of the connection between the first connecting roll and the second connecting roll in a roll in some embodiments of the present application;

[0030] Figure 6 shows Figure 5 a cross-sectional view of the B-B portion in

[0031] Main element symbol description:

[0032] 100 - shaft body; 200 - first connecting roll; 300 - second connecting roll; 310 - threaded hole; 400 - first avoidance portion; 500 - first limiting member; 510 - bolt; 520 - through hole; 600 - second avoidance portion; 700 - bearing; 800 - second limiting member; 900 - third limiting portion; 910 - first wall surface; 920 - second wall surface; 1000 - pole piece; 2000 - tab. Detailed implementation manners

[0033] The following will describe in detail the embodiments of the present application. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application.

[0034] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0035] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more, unless otherwise clearly and specifically defined.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this template herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] As Figure 1 and Figure 5 shown, some embodiments of this application provide a roller with an axial direction, which can quickly switch between a clearance avoidance function and a roller function to reduce the use cost and improve the production efficiency.

[0039] The roller includes a shaft body 100, a first connecting roller 200, a second connecting roller 300 and a first limiting member 500.

[0040] The first connecting roller 200 is sleeved on the shaft body 100, and the first connecting roller 200 is rotatably connected to the shaft body 100. It should be noted that the axis of the first connecting roller 200 coincides with the axis of the shaft body 100.

[0041] In this embodiment, there is a gap between the first connecting roller 200 and the shaft body 100 to avoid friction loss during the rotation of the first connecting roller 200 relative to the shaft body 100, thereby ensuring the smooth rotation and service life between the first connecting roller 200 and the shaft body 100.

[0042] The second connecting roller 300 is sleeved on the first connecting roller 200, and the axis of the second connecting roller 300 coincides with the axis of the first connecting roller 200. Among them, the connection method between the second connecting roller 300 and the first connecting roller 200 includes any one of snap connection, bonding, threaded connection, bolt connection, and frictional abutment, which can be specifically set according to the actual situation.

[0043] It can be understood that in this embodiment, the second connecting roller 300 and the first connecting roller 200 are detachably connected to facilitate the installation or disassembly between the second connecting roller 300 and the first connecting roller 200, thereby realizing the rapid switching between the clearance function and the over-roller function, improving production efficiency, and reducing production costs.

[0044] It can be understood that by connecting the second connecting roller 300 and the first connecting roller 200, when the first connecting roller 200 rotates relative to the shaft body 100, the second connecting roller 300 can be driven to rotate synchronously through the first connecting roller 200.

[0045] Along the axis direction of the first connecting roller 200, the end of the second connecting roller 300 and the side of the first connecting roller 200 facing away from the shaft body 100 define a first avoidance portion 400.

[0046] It should be noted that in this embodiment, along the axis direction of the first connecting roller 200, the length of the first connecting roller 200 is greater than the length of the second connecting roller 300, that is, the second connecting roller 300 has two ends, and the two ends respectively define two spaced-apart first avoidance portions 400 with the side of the first connecting roller 200 facing away from the shaft body 100. It can be understood that the two first avoidance portions 400 are respectively arranged at both ends of the second connecting roller 300.

[0047] In this embodiment, the second connecting roller 300 is used to convey the electrode sheet 1000.

[0048] In addition, the first limiting member 500 is arranged close to the end of the second connecting roller 300 along its axis direction and is located within the first avoidance portion 400. It can be understood that there are two first limiting members 500, and one first limiting member 500 is correspondingly arranged within one first avoidance portion 400.

[0049] By connecting the first limiting member 500 with the first avoidance portion 400, a limiting effect on the second connecting roller 300 is formed by the two first limiting members 500.

[0050] Further, along the direction perpendicular to the axis of the first connecting roller 200, a height difference is formed between the side of the first limiting member 500 facing away from the first connecting roller 200 and the side of the second connecting roller 300 facing away from the first connecting roller 200, so that a second avoiding portion 600 is defined between the side of the first limiting member 500 facing away from the first connecting roller 200 and the end of the second connecting roller 300, and the second avoiding portion 600 is used to avoid the tab 2000.

[0051] By connecting the second connecting roller 300 to the first connecting roller 200 in a detachable manner, the installation or disassembly efficiency between the second connecting roller 300 and the first connecting roller 200 is improved, so as to realize the switching between the function of passing the roller for conveying the pole piece 1000 and the function of avoiding the tab 2000, realizing versatility, which can not only improve the production efficiency, but also reduce the production cost.

[0052] It should be noted that, along the axis direction, the tab 2000 is arranged at the edge of the pole piece 1000, and there is a gap between the tab 2000 and the first limiting member 500, and this gap is the second avoiding portion 600, so as to form an avoidance between the tab 2000 and the first limiting member 500 through the second avoiding portion 600, thereby ensuring the stability of the second connecting roller 300 during the process of conveying the pole piece 1000.

[0053] Such as Figure 3 and Figure 4 As shown, in some embodiments of the present application, along the axis direction, the passing roller further includes a bearing 700, the bearing 700 is sleeved on the shaft body 100, and the inner wall of the bearing 700 abuts against the outer wall of the shaft body 100 to prevent the bearing 700 from shaking on the shaft body 100, thereby ensuring the stability of the connection between the bearing 700 and the shaft body 100.

[0054] Wherein, the connection manner between the bearing 700 and the shaft body 100 includes any one of bonding, screw connection, bolt connection, and snap connection, which can be specifically set according to the actual situation.

[0055] In addition, the side of the bearing 700 facing the shaft body 100 is connected to the shaft body 100, and the side of the bearing 700 facing away from the shaft body 100 is connected to the first connecting roller 200. It can be understood that the bearing 700 includes an inner ring and an outer ring connected in a rotating manner, that is, the inner ring of the bearing 700 is fixedly connected to the shaft body 100, and the outer ring of the bearing 700 is fixedly connected to the first connecting roller 200, so as to rotatably connect the first connecting roller 200 to the shaft body 100 through the bearing 700.

[0056] It is understandable that the number of the bearings 700 can be one, two, or any number above two, and can be set according to actual conditions.

[0057] like Figure 3 and Figure 4 As shown, in some embodiments of the present application, the roller further includes two second stoppers 800, and the number of the bearings 700 is two, and the two bearings 700 are respectively arranged at both ends of the axis direction of the first connecting roller 200 to improve the stability and smoothness of the first connecting roller 200 during the rotation relative to the shaft body 100. It can be understood that the bearing 700 is coaxially arranged with the first connecting roller 200.

[0058] Specifically, the two second limit members 800 are respectively arranged corresponding to the two bearings 700, and the second limit member 800 is arranged on the side of the bearing 700 away from the second connecting roller 300, that is, one second limit member 800 is arranged corresponding to one bearing 700, and the other second limit member 800 is arranged corresponding to the other bearing 700.

[0059] Along the axial direction, a second limit member 800 corresponds to abutting against a bearing 700, and the two second limit members 800 are fixedly connected to the shaft body 100 to ensure the stability of the second limit member 800 on the shaft body 100. At the same time, the second limit member 800 provides a limiting effect on the bearing 700 in the axial direction to prevent the bearing 700 from slipping off the shaft body 100, thereby ensuring the stability of the bearing 700 on the shaft body 100.

[0060] In this embodiment, the second limiting member 800 is a limiting ring, and the second limiting member 800 is sleeved on the shaft body 100 .

[0061] The connection method between the second limit member 800 and the shaft body 100 includes any one of bonding, clamping, threaded connection, and bolt connection, which can be specifically set according to actual conditions.

[0062] like Figure 2 and Figure 3 As shown, in some embodiments of the present application, along a direction perpendicular to the axis, the distance from the side of the second limit member 800 away from the shaft body 100 to the shaft body 100 is smaller than the distance from the side of the bearing 700 away from the shaft body 100 to the shaft body 100, so as to avoid friction between the bearing 700 and the second limit member 800 during the rotation of the first connecting roller 200 relative to the shaft body 100, so as to ensure smoothness during the rotation process.

[0063] In some embodiments, the outer diameter of the second limit member 800 is smaller than the inner diameter of the outer ring of the bearing 700 to ensure that during the relative rotation between the outer ring and the inner ring of the bearing 700, no friction is generated between the second limit member 800 and the outer ring of the bearing 700, thereby ensuring the smoothness and stability of the rotation of the first connecting roller 200 relative to the shaft body 100.

[0064] like Figure 6 As shown, in some embodiments of the present application, third limiting portions 900 are respectively provided at both ends of the first connecting roller 200 , and the third limiting portion 900 has a first wall surface 910 and a second wall surface 920 that are connected.

[0065] The first wall surface 910 is an annular surface, the axis of which coincides with the axis of the first connecting roller 200, and the first wall surface 910 faces the shaft body 100, and the distances from two different positions on the first wall surface 910 to the shaft body 100 are equal. The second wall surface 920 faces the axis direction of the first connecting roller 200, and the second wall surface 920 is also an annular surface, and the side of the second wall surface 920 close to the first wall surface 910 is connected to the first wall surface 910, so that the third limiting portion 900 is formed by connecting the first wall surface 910 and the second wall surface 920.

[0066] Specifically, the first wall surface 910 abuts against the side of the outer ring of the bearing 700 away from the shaft body 100, so as to form a limit on the bearing 700 in a direction perpendicular to the axis through the first wall surface 910, and the second wall surface 920 abuts against the side of the outer ring of the bearing 700 away from the second limiting member 800, so as to form a limit on the bearing 700 in the axis direction through the second wall surface 920.

[0067] It can be understood that, along the axial direction, one side of the bearing 700 abuts against the second wall 920, and the other side of the bearing 700 abuts against the second limit member 800, so that the bearing 700 is limited in the axial direction by the second limit member 800 and the second wall 920, thereby ensuring the stability of the bearing 700 on the shaft body 100.

[0068] like Figure 2 and Figure 3 As shown, in some embodiments of the present application, the distance from the side of the first limiting member 500 away from the first connecting roller 200 to the first connecting roller 200 is smaller than the distance from the side of the second connecting roller 300 away from the first connecting roller 200 to the first connecting roller 200, so as to form an annular step between the side of the first limiting member 500 away from the first connecting roller 200 and the end of the second connecting roller 300, and the annular space formed by the annular step is the second avoidance portion 600, so as to avoid the pole ear 2000 through the second avoidance portion 600.

[0069] likeFigure 2 As shown, in some embodiments of the present application, the over-roller includes a bolt 510.

[0070] Wherein, a plurality of threaded holes 310 are provided at the end of the second connecting roller 300, and the plurality of threaded holes 310 are evenly distributed at intervals along the circumferential direction of the second connecting roller 300.

[0071] Along the axial direction, the threaded end of the bolt 510 penetrates through the first limiting member 500 and is threadedly connected to the threaded hole 310.

[0072] It can be understood that, in this embodiment, the number of bolts 510 is equal to the number of threaded holes 310, and one bolt 510 corresponds to one threaded hole 310 for connection, so as to connect the first limiting member 500 and the second connecting roller 300 through the bolt 510, thereby improving the connection stability between the first limiting member 500 and the second connecting roller 300, and at the same time, it is easy to disassemble the first limiting member 500 from the second connecting roller 300, so as to facilitate removing the first limiting member 500 and the second connecting roller 300 from the first connecting roller 200, thus enabling the over-roller to switch between the over-roller structure and the clearance roller structure, improving the utilization rate of the over-roller and reducing the production cost.

[0073] Such as Figure 1 and Figure 4 As shown, in some embodiments of the present application, a through hole 520 is provided through the first limiting member 500 in the vertical direction, the over-roller includes a connecting member (not shown in the figure), and the end of the connecting member penetrates through the through hole 520 and is connected to the first connecting roller 200, so as to connect the first limiting member 500 and the first connecting roller 200 through the connecting member, thereby ensuring the connection stability between the first limiting member 500 and the first connecting roller 200.

[0074] It can be understood that, since in the axial direction, first limiting members 500 are respectively provided at both ends of the second connecting roller 300, and the first limiting member 500 is connected to the second connecting roller 300 through the bolt 510, and the first limiting member 500 is connected to the first connecting roller 200 through the connecting member, the first limiting member 500 is fixed on the first connecting roller 200, thereby fixedly connecting the second connecting roller 300 and the first connecting roller 200.

[0075] Wherein, the connecting member can be a pin or a bolt.

[0076] It should be noted that the vertical direction mentioned here refers to the direction perpendicular to the axis.

[0077] Such as Figure 1 and Figure 4As shown, in some embodiments of the present application, the number of the through holes 520 is multiple, and the multiple through holes 520 are evenly distributed at intervals along the circumferential direction of the first limiting member 500.

[0078] It can be understood that the number of the through holes 520 can be any number of two or more, and can be specifically set according to the actual situation.

[0079] It should be noted that the number of the connecting members is equal to the number of the through holes 520, and one connecting member is correspondingly inserted through one through hole 520 and connected to the first connecting roller 200, so that the first limiting member 500 is connected to the first connecting roller 200 through the connecting member.

[0080] In this embodiment, the first limiting member 500 is detachably connected to the first connecting roller 200 through the connecting member, which can not only improve the connection stability between the first limiting member 500 and the first connecting roller 200, but also be easy to disassemble, thereby improving the convenience of installation or disassembly between the first limiting member 500 and the first connecting roller 200.

[0081] Some other embodiments of the present application provide a die-cutting machine, including the through roller described in any one of the above embodiments.

[0082] The die-cutting machine has the structure of the through roller described in any one of the above embodiments and the beneficial effects brought by it, which will not be elaborated here one by one.

[0083] In all the examples shown and described here, any specific value should be construed as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0084] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0085] The above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application.

Claims

1. A roller having an axial direction, characterized in that: include: Axle body (100); A first connecting roller (200), sleeved on the shaft body (100) and rotatably connected to the shaft body (100); a second connecting roller (300) sleeved on the first connecting roller (200), wherein an end of the second connecting roller (300) and a side of the first connecting roller (200) facing away from the shaft (100) define a first avoidance portion (400), and the second connecting roller (300) is used to convey the pole piece; The first limiting member (500) is arranged near the end of the second connecting roller (300) along its axial direction and is located in the first avoiding portion (400). The first limiting member (500) is connected to the first avoiding portion (400). The side of the first limiting member (500) facing away from the first connecting roller (200) and the end of the second connecting roller (300) define a second avoiding portion (600). The second avoiding portion (600) is used to avoid the pole ear (2000).

2. The roller according to claim 1, characterized in that: Along the axial direction, the roller further comprises a bearing (700), the bearing (700) is sleeved on the shaft body (100), and the first connecting roller (200) is rotatably connected to the shaft body (100) via the bearing (700).

3. The roller according to claim 2, characterized in that: The roller further comprises two second stoppers (800), and the bearings (700) are two in number, which are respectively located at two ends of the first connecting roller (200) along the axis; The two second position-limiting members (800) are respectively arranged corresponding to the two bearings (700), and the two second position-limiting members (800) are both fixedly connected to the shaft body (100).

4. The roller according to claim 3, characterized in that: Along a direction perpendicular to the axis, a distance from a side of the second limit member (800) facing away from the shaft body (100) to the shaft body (100) is smaller than a distance from a side of the bearing (700) facing away from the shaft body (100) to the shaft body (100).

5. The roller according to claim 3, characterized in that: The first connecting roller (200) is provided with a third limiting portion (900) at both ends thereof, and the third limiting portion (900) has a first wall surface (910) and a second wall surface (920) connected to each other; The first wall surface (910) abuts against a side of the outer ring of the bearing (700) that is away from the shaft body (100), and the second wall surface (920) abuts against a side of the outer ring of the bearing (700) that is away from the second limit member (800).

6. The roller according to claim 1, characterized in that: The distance between the first connecting roller (200) and the side of the first limiting member (500) facing away from the first connecting roller (200) is smaller than the distance between the second connecting roller (300) and the side of the second connecting roller (200) facing away from the first connecting roller (200).

7. The roller according to claim 1, characterized in that: The roller includes a bolt (510); The end of the second connecting roller (300) is provided with a plurality of threaded holes (310), and the plurality of threaded holes (310) are evenly spaced along the circumference of the second connecting roller (300), and the threaded end of the bolt (510) is passed through the first limiting member (500) and is threadedly connected to the threaded hole (310).

8. The roller according to claim 1, characterized in that: A through hole (520) is provided on the first limiting member (500) in the vertical direction, and the passing roller comprises a connecting member, the end of which is passed through the through hole and connected to the first connecting roller (200).

9. The roller according to claim 8, characterized in that: There are a plurality of through holes, and the plurality of through holes (520) are evenly spaced along the circumference of the first limiting member (500).

10. A die-cutting machine, characterized in that: The invention comprises the roller according to any one of claims 1 to 9.

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