A high efficiency collecting machine
By changing the contact position between the steel wire and the take-up reel using the drive assembly and the wire guide assembly, and adjusting the bending stress of the steel wire using the straightening assembly, the problem of uneven winding of the steel wire is solved, thereby improving the service life of the steel wire and the applicability of the take-up machine.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGYIN CITY JIUAN BICYCLE IND CO LTD
- Filing Date
- 2025-07-09
- Publication Date
- 2026-06-12
AI Technical Summary
In existing wire winding machines, during the winding process, the wire tends to accumulate in the same position on the feed wheel, resulting in uneven winding, stress concentration, and shortened wire life.
By employing a drive assembly and a wire guide assembly, and through the cooperation of the guide wheel and the reciprocating screw, the axial position of the contact between the steel wire and the take-up wheel is changed. Combined with the straightening assembly, the bending stress of the steel wire is released, and the spacing between the straightening wheels is adjusted to accommodate steel wires of different diameters.
This achieves uniform winding of the steel wire, reduces local accumulation, and improves the service life of the steel wire and the applicability of the winding machine.
Smart Images
Figure CN224350118U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of steel wire processing technology, and in particular to a high-efficiency wire winding machine. Background Technology
[0002] When steel wire raw materials leave the factory, they are usually tightly wrapped in plastic belts. Due to the lack of order and regularity during the packaging process, the steel wires inside the belts are in a disordered entangled state. This not only increases the difficulty of subsequent processing but may also cause wear or knots on the surface of the steel wires. To meet the requirements of standardized processing, a coiling machine is needed to rewind and reorganize the steel wire raw materials.
[0003] Existing wire reel machines mainly consist of a feed reel and a take-up reel, with the take-up reel being driven by a motor to rotate and take up the wire.
[0004] However, as the winding process continues, the steel wires tend to accumulate in the same spot on the pay-off reel, creating an uneven winding layer. This uneven winding causes the locally accumulated wires to experience greater compressive stress. Under this stress concentration, the wires are prone to deformation or even damage, significantly shortening the service life of the wire rope and presenting a clear drawback. Utility Model Content
[0005] To improve the uniformity of the steel wire on the take-up reel and extend the service life of the steel wire, this application provides a high-efficiency take-up machine.
[0006] The high-efficiency closing machine provided in this application adopts the following technical solution:
[0007] A high-efficiency winding machine includes a frame, with a wire feeding reel at one end and a wire take-up reel at the other end. A wire guiding assembly is disposed between the wire feeding reel and the wire take-up reel. A sliding groove is formed on the frame, parallel to the axis of the wire take-up reel. The wire guiding assembly includes a wire guiding frame slidably connected in the sliding groove, with a guide wheel for guiding the wire on the wire guiding frame. A reciprocating screw is rotatably connected to the frame, and the wire guiding frame is threaded onto the reciprocating screw. A drive assembly is disposed on the frame to drive the wire take-up reel and the reciprocating screw to rotate synchronously.
[0008] By adopting the above technical solution, during take-up, the steel wire is passed through the guide wheel and wound around the take-up wheel. Then, the drive assembly is activated, which drives the take-up wheel and the reciprocating screw to rotate synchronously. Under the guidance of the sliding groove, the reciprocating screw drives the guide wheel on the wire guide frame to reciprocate along the axis of the take-up wheel. During the movement, the guide wheel continuously changes the axial position of the steel wire in contact with the take-up wheel, thereby making the steel wire evenly wound on the take-up wheel, improving the uniformity of the steel wire winding, reducing the occurrence of local accumulation and entanglement of the steel wire, and improving the service life of the steel wire.
[0009] Optionally, the drive assembly includes a drive motor, the output shaft of the drive motor is coaxially provided with a mounting shaft, the take-up reel is mounted on the mounting shaft by fasteners, and the ends of the mounting shaft and the reciprocating lead screw are coaxially provided with synchronous pulleys, and the outer surfaces of the two synchronous pulleys are jointly fitted with a synchronous belt.
[0010] By adopting the above technical solution, during the winding process, the drive motor starts and drives the mounting shaft to rotate. With the fasteners in place, the mounting shaft drives the take-up wheel to rotate. The rotation of the take-up wheel causes the steel wire to wind onto the take-up wheel. At the same time, under the transmission action of the synchronous pulley and synchronous belt, the reciprocating screw is driven to rotate, thereby guiding the wire laying frame to arrange the steel wire. In this way, the winding and laying operations are synchronized.
[0011] Optionally, the take-up reel is slidably sleeved on the mounting shaft, the mounting shaft is provided with a guide bar along the axial direction, the take-up reel is provided with a guide groove that slidably engages with the guide bar, the fastener is a stop block threadedly connected to the end of the mounting shaft, a limit plate is provided at the end of the mounting shaft away from the stop block, and the take-up reel is disposed between the stop block and the limit plate.
[0012] By adopting the above technical solution, after a roll of steel wire is wound up, the worker unscrews the stop block and then slides the take-up reel off the mounting shaft. When installing a new take-up reel, the guide groove is aligned with the guide strip, and then the take-up reel is pushed to fit onto the mounting shaft. When the take-up reel abuts against the limiting plate, the stop block is threaded onto the end of the mounting shaft, thus clamping the take-up reel between the stop block and the limiting plate. This setup enables quick installation and removal of the take-up reel on the mounting shaft, facilitating worker replacement of the take-up reel and improving the convenience of worker operation.
[0013] Optionally, a straightening assembly is provided between the wire feeding reel and the wire laying assembly. The straightening assembly includes a straightening plate mounted on the frame. The straightening plate has a through groove for the steel wire to pass through. The straightening plate has a plurality of moving grooves evenly distributed around its circumference. A moving frame is slidably connected in each moving groove. A straightening wheel is rotatably connected on each moving frame. A retaining spring is provided in each moving groove. The elastic force of the retaining spring drives the straightening wheel to abut against the outer surface of the steel wire.
[0014] By adopting the above technical solution, after the steel wire is released, it is threaded into the through groove. At this time, the elastic force of the clamping spring pushes multiple straightening wheels to abut against the outer surface of the steel wire. When the steel wire passes through the through groove, the straightening wheels apply pressure to the steel wire in the direction of the steel wire axis, thereby effectively releasing the bending stress and torsional deformation generated by the steel wire in the original winding state, realizing the straightening of the steel wire, effectively reducing the possibility of winding chaos caused by the bending of the steel wire, and thus further improving the uniformity of the steel wire on the pay-off wheel.
[0015] Optionally, the straightening plate is provided with an adjustment assembly, which includes a pull rope disposed on the movable frame. A take-up roller corresponding to each of the pull ropes is rotatably connected to the straightening plate. The end of the pull rope away from the movable frame is wound around the take-up roller. A driven gear is coaxially disposed at the end of each take-up roller. A gear ring meshing with the driven gears is rotatably connected to the end face of the straightening plate away from the straightening wheel. A rotating assembly for driving the gear ring to rotate is provided on the straightening plate.
[0016] By adopting the above technical solution, when it is necessary to adjust the spacing between the straightening rollers, the rotating component drives the gear ring to rotate, which in turn drives multiple meshing driven gears to rotate, thereby driving multiple take-up rollers to rotate synchronously. During the rotation of the take-up rollers, the pull rope is wound or released. The movement of the pull rope, in conjunction with the elastic force of the clamping spring, drives the moving frame to slide in the moving groove. When the straightening rollers come into contact with the outer surface of the steel wire, the adjustment stops. The setting of the adjustment component realizes the adjustment of the spacing between multiple straightening rollers, thereby making the straightening component applicable to steel wires of different diameters and improving the applicability of the take-up machine.
[0017] Optionally, the rotating assembly includes a rotating motor mounted on the straightening plate. The rotating motor is a forward and reverse rotating brake motor. A drive gear is coaxially mounted on the output shaft of the rotating motor, and the drive gear meshes with the gear ring.
[0018] By adopting the above technical solution, when it is necessary to adjust the pressure of the straightening wheel on the steel wire, the rotating motor is started to drive the drive gear to rotate, the drive gear drives the gear ring to rotate, and the gear ring drives multiple take-up rollers on the driven gear to rotate, thereby achieving adjustment. In addition, the use of a forward and reverse brake motor can prevent the slack of the pull rope or the displacement of the straightening wheel position caused by the free rotation of the gear ring when the equipment suddenly loses power or stops in an emergency, thus ensuring the straightening function of the straightening component.
[0019] Optionally, a guide sleeve is provided on the frame, and the guide sleeve is disposed between the wire feeding wheel and the straightening assembly.
[0020] By adopting the above technical solution, the guide sleeve initially guides the trajectory of the steel wire, ensuring that the steel wire smoothly transitions to the straightening component.
[0021] Optionally, the outer surface of the take-up reel is coated with an anti-scratch coating.
[0022] By adopting the above technical solution, the anti-scratch coating can reduce the risk of the wire reel surface being scratched by the wire and improve the service life of the wire reel.
[0023] In summary, this application includes at least one of the following beneficial technical effects:
[0024] This application improves the uniformity of wire winding by setting up a drive assembly and a wire laying assembly, and changes the axial position of the contact between the wire and the take-up reel by the wire laying assembly, thereby making the wire evenly wound on the take-up reel, improving the uniformity of wire winding, reducing the occurrence of local accumulation and winding of wire, and improving the service life of the wire.
[0025] This application straightens the steel wire by setting a straightening component, which releases the bending stress and torsional deformation generated in the original winding state of the steel wire, thereby effectively reducing the possibility of winding disorder caused by the bending of the steel wire and further improving the uniformity of the steel wire on the pay-off wheel.
[0026] This application improves the applicability of the winding machine by setting an adjustment component to adjust the spacing between multiple straightening rollers, thereby enabling the straightening component to be applicable to steel wires of different diameters. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the structure of this application.
[0028] Figure 2 This is a schematic diagram of the straightening component in an embodiment of this application.
[0029] Figure 3 This is a schematic diagram of the structure of the ribbon cable assembly and the driving assembly in the embodiments of this application.
[0030] Figure 4 This is an exploded view of the mounting shaft, take-up reel, and fasteners in an embodiment of this application.
[0031] Explanation of reference numerals in the attached drawings: 1. Frame; 101. Feeding reel; 102. Guide sleeve; 103. Sliding groove; 2. Straightening assembly; 21. Straightening plate; 211. Through groove; 212. Moving groove; 22. Moving frame; 23. Straightening wheel; 24. Holding spring; 3. Cable laying assembly; 31. Cable laying frame; 32. Reciprocating screw; 33. Guide wheel; 4. Take-up reel; 41. Guide groove; 5. Adjusting assembly; 51. Pull rope; 52. Take-up roller; 53. Driven gear; 54. Gear ring; 6. Rotating assembly; 61. Rotating motor; 62. Drive gear; 7. Drive assembly; 71. Drive motor; 72. Mounting shaft; 721. Guide bar; 722. Limiting plate; 73. Synchronous pulley; 74. Synchronous belt; 8. Fastener; 81. Stop block. Detailed Implementation
[0032] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.
[0033] This application discloses a high-efficiency closing machine.
[0034] Reference Figure 1A high-efficiency winding machine includes a frame 1. The frame 1 is equipped with a wire feeding wheel 101, a guide sleeve 102, a straightening assembly 2, a wire laying assembly 3, and a winding wheel 4 in sequence along the direction of the wire. The outer surface of the winding wheel 4 is coated with an anti-scratch coating to reduce the possibility of the winding wheel 4 being scratched by the wire.
[0035] When taking the wire back, the worker places the wire coil on the pay-off reel 101, then pulls one end of the wire to pass through the guide sleeve 102. The guide sleeve 102 guides the wire to the straightening assembly 2, and the straightened wire is then wound onto the take-up reel 4 via the wire laying assembly 3.
[0036] Reference Figure 1 and Figure 2 The straightening assembly 2 includes a straightening plate 21 fixedly installed on the frame 1. The straightening plate 21 has a through groove 211 for the steel wire to pass through. The axis of the through groove 211 and the axis of the guide sleeve 102 are on the same straight line.
[0037] Reference Figure 1 and Figure 2 The straightening plate 21 has multiple moving grooves 212 evenly distributed circumferentially on the end face of the cable assembly 3. In this embodiment, there are four moving grooves 212. The cross-section of the moving grooves 212 is T-shaped. Each moving groove 212 is parallel to the radial direction of the guide sleeve 102. A moving frame 22 is slidably connected in each moving groove 212. A straightening wheel 23 is rotatably connected on each moving frame 22. The straightening wheels 23 are evenly distributed circumferentially on the outer periphery of the steel wire.
[0038] Reference Figure 1 and Figure 2 Each moving groove 212 is equipped with a retaining spring 24. One end of the retaining spring 24 is fixedly connected to the inner side wall of the moving groove 212 away from the through groove 211, and the other end is fixedly connected to the moving frame 22. The elastic force of the retaining spring 24 drives the straightening wheel 23 to abut against the outer surface of the steel wire.
[0039] After the steel wire passes through the guide sleeve 102 and enters the through groove 211, the elastic force of the clamping spring 24 pushes the four straightening wheels 23 to simultaneously abut against the outer surface of the steel wire. When the take-up wheel 4 pulls the steel wire through the through groove 211, the straightening wheels 23 apply pressure to the steel wire in the direction of the steel wire axis, thereby effectively releasing the bending stress and torsional deformation generated by the steel wire in the original winding state, realizing the straightening of the steel wire, effectively reducing the possibility of winding chaos caused by the bending of the steel wire, thereby improving the uniformity of the steel wire on the pay-off wheel 101.
[0040] Reference Figure 1 and Figure 2In order to make the straightening assembly 2 suitable for steel wires of different diameters, the straightening plate 21 is provided with an adjustment assembly 5. The adjustment assembly 5 includes a pull rope 51 fixedly connected to the moving frame 22. A take-up roller 52 corresponding to a plurality of pull ropes 51 is rotatably connected to the straightening plate 21. The take-up roller 52 is located at the end of the moving groove 212 away from the through groove 211.
[0041] Reference Figure 1 and Figure 2 One end of the pull rope 51 away from the moving frame 22 extends out of the moving groove 212 and is wound around the take-up roller 52. The tightening and releasing of the pull is achieved by the rotation of the take-up roller 52. The end of each take-up roller 52 passes through the straightening plate 21 and is coaxially fixedly connected to the driven gear 53. The end face of the straightening plate 21 away from the straightening wheel 23 is rotatably connected to the gear ring 54 that meshes with the four driven gears 53.
[0042] Reference Figure 1 and Figure 2 A rotating assembly 6 is provided on the straightening plate 21. The rotating assembly 6 includes a rotating motor 61 fixedly installed on the straightening plate 21. The rotating motor 61 is a forward and reverse brake motor. The brake device inside the forward and reverse brake motor can prevent the gear ring 54 from rotating freely when the equipment is suddenly powered off. The output shaft of the rotating motor 61 is coaxially fixedly connected to a drive gear 62, which meshes with the gear ring 54.
[0043] When the diameter of the steel wire changes, the rotating motor 61 is started to drive the drive gear 62 to rotate, the drive gear 62 drives the gear ring 54 to rotate, the gear ring 54 drives the meshing driven gears 53 to rotate, which in turn drives the multiple take-up rollers 52 to rotate synchronously. During the rotation of the take-up rollers 52, the pull rope 51 will be wound or released. The movement of the pull rope 51, in conjunction with the elastic force of the clamping spring 24, drives the moving frame 22 to slide in the moving groove 212. When the straightening wheel 23 comes into contact with the outer surface of the steel wire, the adjustment stops.
[0044] Specifically, when the diameter of the steel wire increases, the take-up roller 52 tightens the pull rope 51. The pull rope 51 overcomes the elastic force of the clamping spring 24, causing the moving frame 22 to move away from the steel wire, thereby increasing the distance between the multiple straightening rollers 23 to accommodate large-diameter steel wires. Conversely, when the diameter of the steel wire decreases, the take-up roller 52 releases the pull rope 51. At this time, the elastic force of the clamping spring 24 pushes the moving frame 22 to move closer to the steel wire, thereby allowing the straightening assembly 2 to accommodate small-diameter steel wires. The setting of the adjusting assembly 5 realizes the adjustment of the distance between the multiple straightening rollers 23, thereby enabling the straightening assembly 2 to be applicable to steel wires of different diameters and improving the applicability of the take-up machine.
[0045] Reference Figure 1 and Figure 3The frame 1 has a sliding groove 103 located between the straightening plate 21 and the take-up reel 4. The sliding groove 103 is parallel to the axis of the take-up reel 4. The wire laying assembly 3 includes a wire laying frame 31 slidably connected in the sliding groove 103. A guide wheel 33 for guiding the steel wire is installed on the wire laying frame 31. A reciprocating screw 32 is rotatably connected to the frame 1. The reciprocating screw 32 is located above the sliding groove 103. The wire laying frame 31 is threadedly connected to the reciprocating screw 32. The lengths of the reciprocating screw 32 and the sliding groove 103 are the same as the length of the take-up reel 4.
[0046] Reference Figure 1 and Figure 3 A drive assembly 7 is provided on the frame 1. The drive assembly 7 includes a drive motor 71 fixedly mounted on the frame 1. The output shaft of the drive motor 71 is coaxially fixedly connected to a mounting shaft 72. The take-up reel 4 is detachably mounted on the mounting shaft 72 by fasteners 8. The ends of the mounting shaft 72 and the reciprocating lead screw 32 are coaxially fixedly connected to synchronous pulleys 73. The outer surfaces of the two synchronous pulleys 73 are covered with a synchronous belt 74.
[0047] After passing through the through groove 211, the steel wire passes through the guide wheel 33 and is wound onto the take-up wheel 4. During the take-up process, the drive motor 71 starts and drives the mounting shaft 72 to rotate. With the fastener 8 in place, the mounting shaft 72 drives the take-up wheel 4 to rotate. The rotation of the take-up wheel 4 causes the steel wire to be wound onto the take-up wheel 4. At the same time, under the transmission action of the synchronous pulley 73 and the synchronous belt 74, the reciprocating screw 32 is driven to rotate. Under the guidance of the sliding groove 103, the reciprocating screw 32 drives the guide wheel 33 on the wire guide frame 31 to reciprocate along the axis of the take-up wheel 4. During the movement, the guide wheel 33 continuously changes the axial position of the steel wire in contact with the take-up wheel 4, thereby making the steel wire evenly wound on the take-up wheel 4, improving the uniformity of the steel wire winding, reducing the occurrence of local accumulation and winding of the steel wire, and improving the service life of the steel wire.
[0048] Reference Figure 3 and Figure 4 The take-up reel 4 is slidably sleeved on the mounting shaft 72. The mounting shaft 72 is fixedly connected to the guide bar 721 along the axial direction. The take-up reel 4 is provided with a guide groove 41 that slides with the guide bar 721. The fastener 8 is a stop 81 threadedly connected to the end of the mounting shaft 72. The end of the mounting shaft 72 away from the stop 81 is coaxially fixedly connected to the limit plate 722. The two opposite end faces of the take-up reel 4 abut against the stop 81 and the limit plate 722 respectively.
[0049] After a roll of wire is wound up, the worker unscrews the stop block 81 and then slides the take-up reel 4 off the mounting shaft 72. After disassembly, the worker aligns the guide groove 41 on the unloaded take-up reel 4 with the guide bar 721 and inserts it. Then, the worker pushes the take-up reel 4 to fit onto the mounting shaft 72. When the take-up reel 4 abuts against the limit plate 722, the stop block 81 is threaded onto the end of the mounting shaft 72, and finally, a new round of take-up operation begins.
[0050] The implementation principle of a high-efficiency winding machine in this application embodiment is as follows: the worker places the wire coil on the feed reel 101, then pulls one end of the wire to make it pass through the guide sleeve 102, the through groove 211 and the guide wheel 33 in sequence, and initially winds one end of the wire onto the take-up reel 4;
[0051] After the steel wire is laid out, the drive motor 71 is started to drive the mounting shaft 72 to rotate. With the fastener 8 in place, the mounting shaft 72 drives the take-up reel 4 to rotate. The rotation of the take-up reel 4 causes the steel wire to wind around it. At the same time, under the transmission action of the synchronous pulley 73 and the synchronous belt 74, the reciprocating screw 32 is driven to rotate. Guided by the sliding groove 103, the reciprocating screw 32 drives the guide wheel 33 on the wire guide frame 31 to reciprocate along the axis of the take-up reel 4. During the movement, the guide wheel 33 continuously changes the axial position of the steel wire in contact with the take-up reel 4, so that the steel wire is evenly wound on the take-up reel 4, improving the uniformity of the steel wire winding, reducing the occurrence of local accumulation and winding of the steel wire, and improving the service life of the steel wire.
[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A high-efficiency winding machine, comprising a frame (1), wherein one end of the frame (1) is provided with a feed reel (101) and the other end is provided with a take-up reel (4), characterized in that, A wire laying assembly (3) is provided between the wire feeding reel (101) and the wire taking reel (4). A sliding groove (103) is provided on the frame (1). The sliding groove (103) is parallel to the axis of the wire taking reel (4). The wire laying assembly (3) includes a wire laying frame (31) slidably connected in the sliding groove (103). A guide wheel (33) for guiding the wire is provided on the wire laying frame (31). A reciprocating screw (32) is rotatably connected to the frame (1). The wire laying frame (31) is threadedly connected to the reciprocating screw (32). A drive assembly (7) is provided on the frame (1) to drive the wire taking reel (4) and the reciprocating screw (32) to rotate synchronously.
2. The high-efficiency closing machine according to claim 1, characterized in that, The drive assembly (7) includes a drive motor (71), and the output shaft of the drive motor (71) is coaxially provided with a mounting shaft (72). The take-up reel (4) is mounted on the mounting shaft (72) by fasteners (8). The ends of the mounting shaft (72) and the reciprocating lead screw (32) are coaxially provided with synchronous pulleys (73), and the outer surfaces of the two synchronous pulleys (73) are jointly fitted with a synchronous belt (74).
3. The high-efficiency closing machine according to claim 2, characterized in that, The take-up reel (4) is slidably sleeved on the mounting shaft (72). The mounting shaft (72) is provided with a guide bar (721) along the axial direction. The take-up reel (4) is provided with a guide groove (41) that slides with the guide bar (721). The fastener (8) is a stop (81) threadedly connected to the end of the mounting shaft (72). A limit plate (722) is provided at the end of the mounting shaft (72) away from the stop (81). The take-up reel (4) is located between the stop (81) and the limit plate (722).
4. The high-efficiency closing machine according to claim 1, characterized in that, A straightening assembly (2) is provided between the wire feeding reel (101) and the wire laying assembly (3). The straightening assembly (2) includes a straightening plate (21) provided on the frame (1). The straightening plate (21) has a through groove (211) for the steel wire to pass through. The straightening plate (21) has a plurality of moving grooves (212) evenly provided in the circumferential direction. A moving frame (22) is slidably connected in each moving groove (212). A straightening wheel (23) is rotatably connected in each moving frame (22). A clamping spring (24) is provided in the moving groove (212). The elastic force of the clamping spring (24) drives the straightening wheel (23) to abut against the outer surface of the steel wire.
5. A high-efficiency closing machine according to claim 4, characterized in that, The straightening plate (21) is provided with an adjustment component (5), which includes a pull rope (51) provided on the movable frame (22). The straightening plate (21) is rotatably connected with a take-up roller (52) corresponding to the pull rope (51) one by one. The end of the pull rope (51) away from the movable frame (22) is wound around the take-up roller (52). Each take-up roller (52) is coaxially provided with a driven gear (53) at its end. The straightening plate (21) is rotatably connected with a gear ring (54) that meshes with the driven gear (53) on its end face away from the straightening wheel (23). The straightening plate (21) is provided with a rotating component (6) that drives the gear ring (54) to rotate.
6. A high-efficiency closing machine according to claim 5, characterized in that, The rotating assembly (6) includes a rotating motor (61) mounted on the straightening plate (21). The rotating motor (61) is a forward and reverse rotating brake motor. The output shaft of the rotating motor (61) is coaxially mounted with a drive gear (62), which meshes with the gear ring (54).
7. A high-efficiency closing machine according to claim 4, characterized in that, A guide sleeve (102) is provided on the frame (1), and the guide sleeve (102) is disposed between the wire feeding wheel (101) and the straightening assembly (2).
8. A high-efficiency closing machine according to claim 1, characterized in that, The outer surface of the take-up reel (4) is coated with an anti-scratch coating.