Angle-adjustable copper material straightening device

Abstract

The invention discloses an angle-adjustable copper material straightening device, and belongs to the technical field of straightening machines, the angle-adjustable copper material straightening device comprises a machine shell, a plurality of bearing rollers are arranged in the machine shell, V-shaped ring grooves are formed in the middles of the bearing rollers, arc-shaped grooves are formed in the bearing rollers, the arc-shaped grooves and the bearing rollers are coaxial, and the V-shaped ring grooves are arranged in the bearing rollers. An arc-shaped base plate capable of being pushed into the V-shaped ring groove is arranged in the arc-shaped groove; a machine frame is fixedly connected to the upper portion of the machine shell, a lifting connecting piece is arranged on the machine frame, a pressing roller is rotationally connected to the lifting connecting piece, a lantern ring is arranged on the edge of the pressing roller, a first clamping block is fixedly connected to the inner ring of the lantern ring, a first clamping groove is formed in the edge of the pressing roller, and the first clamping block is connected to the first clamping groove in a clamped mode. The device can be suitable for two types of copper materials, the first copper material is V-shaped, and the lower part of the first copper material is a tip; and the second copper material is provided with a plane at the tip of the V shape.

Description

Technical Field

[0001] This invention belongs to the field of straightening machine technology, and particularly relates to an adjustable angle copper straightening device. Background Technology

[0002] Copper, due to its excellent electrical conductivity and ductility, is widely used in various industries such as electrical, construction, and electronics. In actual production, to ensure the quality of subsequent processing, copper materials often need to be straightened, especially copper profiles that have undergone extrusion or drawing, which often exhibit varying degrees of bending, twisting, or irregular deformation. Therefore, developing efficient, stable, and adaptable copper straightening equipment has become a key step in improving the quality and production efficiency of copper processing.

[0003] Existing copper straightening devices are primarily designed for straightening copper profiles with a single cross-sectional shape. Their structures typically consist of a fixed combination of support rollers and pressure rollers, applying pressure to the copper profile through the upper and lower rollers to achieve straightening. However, with the increasing variety of products, copper profiles are becoming more diverse in cross-sectional shape. For example, common No. 1 copper profiles have a V-shaped cross-section, while No. 2 copper profiles may be irregularly shaped with a flat bottom. Traditional equipment often struggles to accommodate multiple cross-sectional shapes simultaneously. Straightening different specifications of copper profiles usually requires replacing the entire support roller or pressure roller structure, resulting in cumbersome operation, low efficiency, and significant human error. Furthermore, existing equipment often relies on external clamps or temporary shims when adjusting the pressure roller height or adapting components, making it difficult to guarantee stability and straightening accuracy, and easily leading to problems such as surface damage or uneven straightening of the copper profile. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides an adjustable angle copper straightening device, which has the advantage of being applicable to two types of copper materials, thus solving the problems of the prior art.

[0005] The present invention is implemented as follows: an adjustable-angle copper straightening device includes a housing, in which a plurality of bearing rollers are provided. The bearing rollers have a V-shaped annular groove in the middle and an arc-shaped groove in the center. The arc-shaped groove and the bearing roller are coaxial. An arc-shaped pad that can be pushed into the V-shaped annular groove is provided in the arc-shaped groove. A frame is fixedly connected to the top of the housing. A lifting connector is provided on the frame. A pressure roller is rotatably connected to the lifting connector. A collar is provided on the edge of the pressure roller. A first locking block is fixedly connected to the inner ring of the collar. A first locking groove is provided on the edge of the pressure roller. The first locking block is engaged with the first locking groove.

[0006] In a preferred embodiment of the present invention, the collar is configured as several concentric sub-layers, with the innermost layer connected to the pressure roller via a first locking block and a first locking groove, and the other sub-layers outside the innermost layer being interlocked with each other via protrusions and recesses; the arc-shaped pad is configured as several coaxial layers.

[0007] As a preferred embodiment of the present invention, the bearing roller includes: a bearing seat, a first roller shaft, and a roller body; the bearing seat is fixedly connected to the housing; the first roller shaft is rotatably connected to the bearing seat, and a first rotation drive component is provided at one end of the first roller shaft; the roller body is sleeved on the first roller shaft and is coaxial with the first roller shaft, and the arc groove and the V-shaped annular groove are both located on the roller body.

[0008] In a preferred embodiment of the present invention, the frame is provided with a vertically arranged slide rail; the lifting connector includes a slider, a bearing rod, an upper fastening ring, and a lower fastening ring; the slider is slidably connected to the slide rail; the bearing rod is provided with an external thread, the bearing rod is connected to the frame through the external thread, and the lower end of the bearing rod is rotatably connected to the slider through a bearing; the upper fastening ring and the lower fastening ring are both connected to the external thread and respectively fit against the upper and lower sides of the frame.

[0009] In a preferred embodiment of the present invention, the pressure roller includes a second roller shaft and a roller disc; the second roller shaft is rotatably connected to the slider via a bearing, and a second rotation drive member is connected to the end of the second roller shaft; the roller disc is sleeved on the second roller shaft, and the collar is connected to the outer edge of the roller disc.

[0010] As a preferred embodiment of the present invention, the roller disc includes two opposing half discs, the inner ring surface of the half discs is provided with a second groove, and the second roller shaft has a retaining strip that engages with the second groove.

[0011] As a preferred embodiment of the present invention, the second roller shaft is a stepped shaft; both ends of the half disc are provided with threaded grooves, and studs are rotatably connected to the threaded grooves by threads, and a stop block is fixedly connected to the end of the stud, and the stop block is in contact with the step of the second roller shaft.

[0012] In a preferred embodiment of the present invention, the roller body includes a first half roller and a second half roller; the arc-shaped groove includes two sub-grooves arranged symmetrically, one sub-grooves being disposed on the first half roller and the other sub-grooves being disposed on the second half roller; a third slot is provided on the lower side of each of the two sub-grooves, and a second locking block is fixedly connected to the arc-shaped pad, the second locking block being engaged with the third slot.

[0013] In a preferred embodiment of the present invention, the first roller shaft is provided with a slot, and the first half roller and / or the second half roller are provided with insertion holes, the insertion holes and the slot are aligned; an insertion rod is slidably connected in the insertion hole, the end of the insertion rod away from the slot is provided with a beveled surface, a spring is provided in the insertion hole, and the spring is connected to the insertion rod; one end of the insertion rod is inserted into the slot, and the other end of the insertion rod is attached to the arc-shaped pad.

[0014] As a preferred embodiment of the present invention, a connecting rod is fixedly connected to the outer side of the arc-shaped pad, and a fixing ring is fixedly connected to the end of the connecting rod; an annular groove is provided on the first roller shaft, the annular groove is located at the edge of the roller body, and when the collar is disengaged from the pressure roller, the collar can extend into the interior of the annular groove, and the side of the collar is attached to the outer side of the fixing ring.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention supports copper materials using a carrier roller within the casing and stabilizes them using a V-shaped groove. For different types of copper materials, straightening is achieved by adjusting whether the arc-shaped pad extends into the V-shaped groove and the combination of the collar and pressure roller. Specifically, for copper material No. 1, the arc-shaped pad does not extend into the V-shaped groove, and the collar and pressure roller work together for straightening; for copper material No. 2, the arc-shaped pad extends into the V-shaped groove, and the sides and edges of the pressure roller squeeze the interior of the copper material to conform to its bottom plane. This straightening device possesses high flexibility and adaptability, enabling rapid switching between straightening modes to accommodate different types of copper materials without replacing or disassembling the entire device, thus saving time and labor costs and improving equipment utilization and production efficiency. Simultaneously, precise component design and a reliable snap-fit ​​structure ensure the stability and high precision of the straightening process, effectively improving the processing quality of the copper materials. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the adjustable-angle copper straightening device provided in an embodiment of the present invention; Figure 2 This is provided by the embodiments of the present invention. Figure 1 A magnified structural diagram of part A in the middle; Figure 3 This is provided by the embodiments of the present invention. Figure 2 A magnified structural diagram of section C; Figure 4 This is provided by the embodiments of the present invention. Figure 1 A magnified structural diagram of part B in the middle section; Figure 5 This is provided by the embodiments of the present invention. Figure 4 A magnified structural diagram of section D in the middle; Figure 6 This is a front view structural schematic diagram of the adjustable-angle copper straightening device provided in an embodiment of the present invention; Figure 7 This is provided by the embodiments of the present invention. Figure 6 A cross-sectional view of the EE section; Figure 8 This is provided by the embodiments of the present invention. Figure 7 A magnified structural diagram of section F in the middle; Figure 9This is a front view structural diagram of the frame and lifting connector provided in an embodiment of the present invention.

[0017] In the diagram: 1. Machine housing; 2. Bearing roller; 3. V-shaped annular groove; 4. Arc groove; 5. Arc pad; 6. Frame; 7. Pressure roller; 8. Collar; 9. First locking block; 10. First locking groove; 11. Slider; 12. Bearing rod; 13. Upper fastening ring; 14. Lower fastening ring; 15. Second locking groove; 16. Locking strip; 17. Threaded groove; 18. Stud; 19. Stop block; 20. Third locking groove; 21. Second locking block; 22. Slot; 23. Insertion hole; 24. Insert rod; 25. Beveled surface; 26. Spring; 27. Connecting rod; 28. Fixing ring; 29. ​​Annular groove; 201. Bearing seat; 202. First roller shaft; 203. Roller body; 2031. First half roller; 2032. Second half roller; 701. Second roller shaft; 702. Roller disc. Detailed Implementation

[0018] To further understand the invention's content, features, and effects, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0019] The structure of the present invention will now be described in detail with reference to the accompanying drawings.

[0020] like Figures 1 to 9 As shown in the figure, an adjustable-angle copper straightening device provided in this embodiment of the invention includes a housing 1, a plurality of bearing rollers 2 are provided in the housing 1, a V-shaped annular groove 3 is provided in the middle of the bearing roller 2, an arc-shaped groove 4 is provided in the bearing roller 2, the arc-shaped groove 4 and the bearing roller 2 are coaxial, and an arc-shaped pad 5 that can be pushed into the V-shaped annular groove 3 is provided in the arc-shaped groove 4; a frame 6 is fixedly connected above the housing 1, a lifting connector is provided on the frame 6, a pressure roller 7 is rotatably connected to the lifting connector, a collar 8 is provided on the edge of the pressure roller 7, a first locking block 9 is fixedly connected to the inner ring of the collar 8, a first locking groove 10 is provided on the edge of the pressure roller 7, and the first locking block 9 is engaged with the first locking groove 10.

[0021] In operation, the bearing roller 2, located within the housing 1, has a V-shaped groove 3 on it to support the V-shaped copper material, ensuring its stability during straightening. For straightening the first type of copper material, the arc-shaped pad 5 does not extend into the V-shaped groove 3, while the collar 8 is fitted onto the edge of the pressure roller 7. The collar 8 and the pressure roller 7 work together to straighten the V-shaped copper material. When processing the second type of copper material, the collar 8 is removed, and the arc-shaped pad 5 is pushed into the V-shaped groove 3. The side and edge surfaces of the pressure roller 7 press against the interior of the second type of copper material, thus adapting to its bottom plane and enabling the straightening of both types of copper materials.

[0022] The advantage of this straightening device lies in its high flexibility and adaptability. It eliminates the need to replace or disassemble the entire machine; switching between straightening modes for copper material #1 and #2 can be achieved simply through component adjustments. This not only saves time and labor costs but also improves equipment utilization and production efficiency. Furthermore, precise component design and a reliable snap-fit ​​structure ensure stability and high precision during the straightening process, effectively enhancing the processing quality of the copper material.

[0023] Furthermore, the collar 8 is composed of several concentric sub-layers, with the innermost layer connected to the pressure roller 7 via a first locking block 9 and a first locking groove 10. The other sub-layers outside the innermost layer are interlocked by protrusions and recesses. The arc-shaped pad 5 is composed of several coaxial layers. This configuration, with the collar 8 consisting of several concentric sub-layers and the innermost layer connected to the pressure roller 7 via the first locking block 9 and the first locking groove 10, ensures the stability and precise control of the pressure roller 7. The other sub-layers outside the innermost layer are interlocked by protrusions and recesses. This design allows the operator to adjust the thickness of the collar 8 as needed to accommodate the bottom plane of copper material of different widths. The arc-shaped pad 5 is also designed as several coaxial layers, allowing the pad to be adjusted according to the width and shape of the copper material. By selecting appropriate arc-shaped pad 5 layers, suitable support can be provided for copper material of different sizes, ensuring stability and accuracy during the straightening process. The design of this multi-layered collar 8 and arc-shaped pad 5 enhances the adaptability of the straightening device, enabling it to flexibly meet the straightening needs of different specifications of No. 2 copper material. Operators can quickly switch between devices without changing or disassembling them, simply by adjusting components, thereby improving production efficiency and equipment utilization.

[0024] Specifically, the bearing roller 2 includes: a bearing seat 201, a first roller shaft 202, and a roller body 203; the bearing seat 201 is fixedly connected to the housing 1; the first roller shaft 202 is rotatably connected to the bearing seat 201, and a first rotation drive component is provided at one end of the first roller shaft 202; the roller body 203 is sleeved on the first roller shaft 202 and is coaxial with the first roller shaft 202, and the arc groove 4 and the V-shaped annular groove 3 are both located on the roller body 203.

[0025] Specifically, the frame 6 is provided with a vertically arranged slide rail; the lifting connector includes a slider 11, a support rod 12, an upper fastening ring 13, and a lower fastening ring 14; the slider 11 is slidably connected to the slide rail; the support rod 12 is provided with an external thread, and the support rod 12 is connected to the frame 6 through the external thread, and the lower end of the support rod 12 is rotatably connected to the slider 11 through a bearing; the upper fastening ring 13 and the lower fastening ring 14 are both connected to the external thread and respectively fit against the upper and lower sides of the frame 6.

[0026] The height of the support rod 12 can be adjusted by rotating it, which in turn adjusts the height of the pressure roller 7. This setting is suitable for copper materials of different thicknesses, such as No. 1 and No. 2 copper materials. For example, for thicker No. 1 or No. 2 copper materials, the height of the pressure roller 7 can be increased.

[0027] Specifically, the pressure roller 7 includes a second roller shaft 701 and a roller disc 702; the second roller shaft 701 is rotatably connected to the slider 11 via a bearing, and a second rotation drive component is connected to the end of the second roller shaft 701; the roller disc 702 is sleeved on the second roller shaft 701, and the collar 8 is connected to the outer edge of the roller disc 702. Both the first and second rotation drive components can be configured as a combination of a motor, a sprocket, and a chain, respectively used to drive the first roller shaft 702 and the second roller shaft 701 to rotate.

[0028] Specifically, the roller disc 702 includes two opposing half-discs. A second groove 15 is formed on the inner surface of each half-disc, and a retaining strip 16 on the second roller shaft 701 engages with the second groove 15. This design allows the two half-discs to be moved axially when replacement is needed, disengaging the retaining strip 16 and the second groove 15 for removal. This design also facilitates the replacement of different roller discs 702, making them suitable for copper materials with different angles.

[0029] Furthermore, the second roller shaft 701 is a stepped shaft; both ends of the half-disc are provided with threaded grooves 17, and studs 18 are rotatably connected to the threaded grooves 17 by threads. A stop block 19 is fixedly connected to the end of the stud 18, and the stop block 19 fits against the step of the second roller shaft 701. With this arrangement, the studs 18 can fix the two half-discs and prevent them from moving axially.

[0030] Preferably, the threaded groove 17 is composed of two aligned semi-threaded grooves 17, which are respectively located on the two half-discs. With this arrangement, the positions of the two half-discs can be defined by two coaxially arranged studs 18.

[0031] Furthermore, the roller body 203 includes a first half-roller 2031 and a second half-roller 2032; the arc-shaped groove 4 includes two symmetrically arranged sub-grooves, one of which is located in the first half-roller 2031 and the other in the second half-roller 2032; a third locking groove 20 is provided on the lower side of each of the two sub-grooves, and a second locking block 21 is fixedly connected to the arc-shaped pad 5, the second locking block 21 engaging with the third locking groove 20. With this arrangement, both the first half-roller 2031 and the second half-roller 2032 can be disassembled, facilitating the replacement of the roller body 203 and making it suitable for copper materials with different angles. The arc-shaped pad 5 can not only be pushed into the V-shaped annular groove 3 for use with No. 2 copper material, but also the first half-roller 2031 and the second half-roller 2032 can be fixed by the second locking block 21.

[0032] Furthermore, the first roller 202 is provided with a slot 22, and the first half roller 2031 and / or the second half roller 2032 are provided with insertion holes 23, the insertion holes 23 and the slot 22 are aligned; an insertion rod 24 is slidably connected in the insertion hole 23, the end of the insertion rod 24 away from the slot 22 is provided with a chamfered surface 25, a spring 26 is provided in the insertion hole 23, the spring 26 is connected to the insertion rod 24; one end of the insertion rod 24 is inserted into the slot 22, and the other end of the insertion rod 24 is attached to the arc-shaped pad 5.

[0033] This setup provides the following benefits: First, because the insert rod 24 is inserted into the slot 22, the first half-roller 2031 and the second half-roller 2032 can rotate synchronously with the first roller shaft 202; and the positions of the first half-roller 2031 and the second half-roller 2032 can be fixed to prevent axial movement. Second, by inserting the arc-shaped pad 5, the insert rod 24 can be inserted into the slot 22, and the arc-shaped pad 5 can abut against the insert rod 24 regardless of whether it extends into the V-shaped groove 3. If it is necessary to disassemble the first half-roller 2031 and the second half-roller 2032, simply remove the arc-shaped pad 5.

[0034] Furthermore, a connecting rod 27 is fixedly connected to the outer side of the arc-shaped pad 5, and a fixing ring 28 is fixedly connected to the end of the connecting rod 27; an annular groove 29 is provided on the first roller shaft 202, and the annular groove 29 is located at the edge of the roller body 203. When the collar 8 is disengaged from the pressure roller 7, the collar 8 can extend into the interior of the annular groove 29, and the side of the collar 8 is attached to the outer side of the fixing ring 28. Through this arrangement, the collar 8 can extend into the interior of the annular groove 29, which on the one hand can support the collar 8 and prevent the collar 8 from moving axially, and on the other hand, the collar 8 limits the arc-shaped pad 5 through the fixing ring 28 (at this time, a part of the arc-shaped pad 5 is inserted into the V-shaped annular groove 3, which can prevent it from disengaging from the V-shaped annular groove 3).

[0035] Working principle of the invention: In practical applications, if a copper processing plant simultaneously produces both No. 1 and No. 2 copper profiles, and the straightening requirements for these two profiles frequently alternate, traditional straightening equipment might require frequent changes or adjustments to accommodate different profiles. However, with this device, operators only need to adjust the positions of the collar 8 and the arc-shaped pad 5 according to the current type of copper profile. For example, when producing No. 1 copper profile, the arc-shaped pad 5 remains in place, and the pressure roller 7 is engaged by the collar 8 to straighten the copper profile. When switching to No. 2 copper profile, the collar 8 is removed, and the arc-shaped pad 5 is pushed into the V-shaped groove 3, forming a support structure suitable for No. 2 copper profile, thus easily achieving the switching of straightening modes. This efficient switching method allows the production line to quickly respond to market demands, improving production efficiency and flexibility.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable-angle copper straightening device, comprising a housing (1), characterized in that: The housing (1) is provided with a plurality of bearing rollers (2), the bearing rollers (2) are provided with a V-shaped annular groove (3) in the middle, the bearing rollers (2) are provided with an arc groove (4), the arc groove (4) and the bearing rollers (2) are coaxial, and the arc groove (4) is provided with an arc pad (5) that can be pushed into the V-shaped annular groove (3). A frame (6) is fixedly connected above the housing (1). A lifting connector is provided on the frame (6). A pressure roller (7) is rotatably connected to the lifting connector. A collar (8) is provided on the edge of the pressure roller (7). A first locking block (9) is fixedly connected to the inner ring of the collar (8). A first locking groove (10) is provided on the edge of the pressure roller (7). The first locking block (9) is engaged with the first locking groove (10).

2. The adjustable-angle copper straightening device as described in claim 1, characterized in that: The collar (8) is set as several concentric sub-layers, and the innermost layer is connected to the pressure roller (7) through the first locking block (9) and the first locking groove (10), and the other sub-layers outside the innermost layer are interlocked with each other through protrusions and recesses; The arc-shaped pad (5) is configured as several coaxial layers.

3. The adjustable-angle copper straightening device as described in claim 1, characterized in that: The bearing roller (2) includes: bearing housing (201), first roller shaft (202), and roller body (203); The bearing housing (201) is fixedly connected to the housing (1); The first roller shaft (202) is rotatably connected to the bearing seat (201), and a first rotation drive component is provided at one end of the first roller shaft (202); The roller body (203) is sleeved on the first roller shaft (202) and is coaxial with the first roller shaft (202), and the arc groove (4) and the V-shaped ring groove (3) are both located on the roller body (203).

4. The adjustable-angle copper straightening device as described in claim 3, characterized in that: The frame (6) is provided with vertically arranged slide rails; The lifting connector includes a slider (11), a bearing rod (12), an upper fastening ring (13), and a lower fastening ring (14). The slider (11) is slidably connected to the slide rail; The support rod (12) is provided with an external thread, and the support rod (12) is connected to the frame (6) through the external thread. The lower end of the support rod (12) is rotatably connected to the slider (11) through a bearing. The upper fastening ring (13) and the lower fastening ring (14) are both connected to the external thread and are respectively attached to the upper and lower sides of the frame (6).

5. The adjustable-angle copper straightening device as described in claim 4, characterized in that: The pressure roller (7) includes a second roller shaft (701) and a roller disc (702); The second roller shaft (701) is rotatably connected to the slider (11) via a bearing, and a second rotation drive is connected to the end of the second roller shaft (701); The roller disc (702) is sleeved on the second roller shaft (701), and the collar (8) is connected to the outer edge of the roller disc (702).

6. The adjustable-angle copper straightening device as described in claim 5, characterized in that: The roller disc (702) includes two opposing half discs. The inner surface of the half disc is provided with a second slot (15). The second roller shaft (701) has a retaining strip (16) which is engaged in the second slot (15).

7. The adjustable-angle copper straightening device as described in claim 6, characterized in that: The second roller shaft (701) is a stepped shaft; both ends of the half disc are provided with threaded grooves (17), and a stud (18) is rotatably connected in the threaded groove (17) by thread, and a stop (19) is fixedly connected to the end of the stud (18), and the stop (19) fits against the step of the second roller shaft (701).

8. The adjustable-angle copper straightening device as described in claim 3, characterized in that: The roller body (203) includes a first half roller (2031) and a second half roller (2032); the arc groove (4) includes two sub-grooves arranged symmetrically, one sub-grooves being disposed in the first half roller (2031) and the other sub-grooves being disposed in the second half roller (2032). The two sub-slots are respectively provided with a third slot (20) on their lower sides. A second card block (21) is fixedly connected to the arc-shaped pad (5), and the second card block (21) is engaged with the third slot (20).

9. The adjustable-angle copper straightening device as described in claim 8, characterized in that: The first roller (202) is provided with a slot (22), and the first half roller (2031) and / or the second half roller (2032) are provided with a insertion hole (23), the insertion hole (23) and the slot (22) are aligned; a insertion rod (24) is slidably connected in the insertion hole (23), the end of the insertion rod (24) away from the slot (22) is provided with a chamfer (25), and a spring (26) is provided in the insertion hole (23), the spring (26) is connected to the insertion rod (24); One end of the insert (24) is inserted into the slot (22), and the other end of the insert (24) is attached to the arc-shaped pad (5).

10. The adjustable-angle copper straightening device as described in claim 3, characterized in that: A connecting rod (27) is fixedly connected to the outer side of the arc-shaped pad (5), and a fixing ring (28) is fixedly connected to the end of the connecting rod (27). The first roller shaft (202) is provided with an annular groove (29), which is located at the edge of the roller body (203). When the collar (8) is disengaged from the pressure roller (7), the collar (8) can extend into the interior of the annular groove (29), and the side of the collar (8) is attached to the outside of the fixed ring (28).

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