JP2014051369A - Winding device, and winding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding device and a winding method, which can wind a cylindrical film smoothly without applying an unnecessary force to the cylindrical film.SOLUTION: A winding device 7 is supplied with a cylindrical film 1 between a circumferential surface 5 of a winding core 3 and a flexible band 19 while a flexible band 19 is released from the circumference surface 5 of the winding core 3. Operation means 57 pushes the flexible band 19 onto the circumference surface 5 of the winding core 3 so that the cylindrical film 1 is clamped between the circumference surface 5 of the winding core 3 and the flexible band 19, and the cylindrical film 1 is warped into an arcuate shape by causing the flexible band 19 to follow the circumference surface 5. The cylindrical film 1 clamped between the circumference 5 of the winding core 3 and the flexible band 19 is wound on the circumference surface 5 of the winding core 3 in accordance with the rotation of the winding core 3 by rotation means 11 and the run of the flexible band 19 by running means 21.

Description

  The present invention relates to a winding device and a winding method for winding a cylindrical film around a core of a winding device.

  FIG. 10 shows a winding device 105 that winds the flexible film 101 around the core 103. The winding device 105 guides the film 101 supplied from above the core 103 with a guide member 107, and between the peripheral surface 109 of the core 103 and the flexible band 111 pressed against the peripheral surface 109, The film 101 is entered. The winding core 103 rotates in the direction of the arrow θ, and the flexible band 111 travels in the direction of the arrow f. The end portion 113 of the film 101 is in contact with the peripheral surface 109 of the core 103 and the flexible belt 111, and is drawn between them by the frictional force received from these. The winding of the film 101 is completed by rotating the end 113 of the film 101 around the peripheral surface 109 of the core 103 in accordance with the rotation of the core 103 and the traveling of the flexible belt 111.

  Subsequently, the winding device 105 removes the flexible band 111 from the core 103 and rotates the core 103 until the film 101 having a desired length is wound around the core 103. In addition to the above operations, the cutting of the film 101 after winding the film 101 and the unloading of the winding core 103 are disclosed in the following patent documents.

  FIGS. 11A and 11B show an example in which the tubular film 115 is wound around the core 103. The tubular film 115 is a label material that covers a body portion such as a bottle, and is supplied to the winding device 105 shown in FIG. 10 in a flat folded form. In this form, the tubular film 115 exhibits a remarkably high elasticity, so that the tubular film 115 is drawn between the peripheral surface 109 of the core 103 and the flexible belt 111 shown in FIG. I can not let you. Further, when the tubular film 115 is pushed with an unreasonable force between the peripheral surface 109 of the core 103 and the flexible band 111, an edge 117 in the width direction of the tubular film 115 shown in FIG. There is a problem that plastic deformation occurs under the compressive force in the direction of the arrow p, and the crease marks are not disappeared.

JP 2002-145494 A JP-A-10-25043

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a winding apparatus and a winding method that can smoothly wind a cylindrical film without applying unnecessary force.

  The present invention is a winding device for winding a flat cylindrical film around a circumferential surface of a winding core, the rotating means for rotating the winding core, and a plurality of guide rollers spaced apart from each other by a distance wider than the winding core. A guide arm that supports the plurality of guide rollers, a flexible band that is wound around the plurality of guide rollers and faces the core, and a traveling unit that travels the flexible band in a direction in which the core rotates. And operating means for moving the guide arm with respect to the core to press the flexible band against the peripheral surface of the core or to disengage the flexible belt from the peripheral surface of the core. In the state where the flexible band is detached from the peripheral surface of the core, a tubular film is supplied between the peripheral surface of the core and the flexible band, and the operating means is the peripheral surface of the core. By pressing a flexible band on the peripheral surface of the winding core and the A cylindrical film is sandwiched between the belt and the flexible belt is made to follow the peripheral surface and is bent into an arc shape having a length corresponding to ½ or more of the peripheral length of the peripheral surface. A cylindrical film sandwiched between a peripheral surface and the flexible band is wound around the peripheral surface of the core in accordance with the rotation of the core by the rotating unit and the traveling of the flexible band by the traveling unit. Features.

  In addition, the present invention is characterized by comprising jet means for generating an air current that presses the cylindrical film against the peripheral surface of the core.

  Further, according to the present invention, the guide arm has a first knuckle section that supports one of the plurality of guide rollers, and a second knuckle section that supports the other guide roller of the plurality of guide rollers, And a joint for pivotally connecting the first knot and the second knot to each other.

  Further, the present invention provides a flexible belt that is pressed against the circumferential surface of the core by turning the second knuckle in the direction of advancing to the circumferential surface of the core with respect to the first knuckle. It bends in the shape of an arc having a length corresponding to 2/3 or more of the peripheral length of the peripheral surface following the peripheral surface.

  In addition, the present invention is characterized by comprising proximity means for bringing a cylindrical film supplied between the peripheral surface of the core and the flexible band into proximity to the peripheral surface of the core.

  Further, the present invention is characterized in that the traveling means causes the flexible belt to travel at a speed higher than a peripheral speed at which the winding core rotates.

  Moreover, the present invention is characterized in that the flexible band has a narrower width than the cylindrical film.

  The present invention also relates to a winding method for winding a flat tubular film around a peripheral surface of a core, and includes a flexible band wound around a plurality of guide rollers separated from each other by a distance wider than the core. A step of facing the peripheral surface of the core, a step of supplying a tubular film between the peripheral surface of the core and the flexible band, and pressing the flexible band against the peripheral surface of the core A step of sandwiching a tubular film between the circumferential surface of the winding core and the flexible band, bending the flexible band in an arc shape following the circumferential surface, and rotating the winding core. A step of causing the flexible band to travel in a direction in which the winding core rotates, and a cylindrical film sandwiched between a circumferential surface of the winding core and the flexible band, and And a step of winding around the circumference of the core in accordance with the travel of the flexure.

  Moreover, this invention presses a cylindrical film on the surrounding surface of the said core in the process of winding the said cylindrical film on the surrounding surface of the said core according to rotation of the said core, and driving | running | working of the said flexible belt. It is characterized by generating an air flow.

  Further, the present invention is equivalent to 1/2 to 2/3 or more of the circumferential length of the peripheral surface by pressing the flexible band against the peripheral surface of the core to cause the flexible band to follow the peripheral surface. It is characterized in that it is bent into a circular arc shape of the length.

  Further, the present invention is characterized in that the flexible belt is caused to travel at a speed faster than a peripheral speed at which the winding core rotates.

  According to the winding device and the winding method of the present invention, the flexible belt wound around the plurality of guide rollers is pressed against the peripheral surface of the core, so that the gap between the peripheral surface of the core and the flexible band is increased. A cylindrical film can be sandwiched. For this reason, a cylindrical film does not receive the force forcedly pushed between the surrounding surface of a winding core, and a flexible belt.

  In addition, when the winding core rotates and the flexible band pressed against the circumferential surface of the winding core travels, the tubular film sandwiched between the circumferential surface of the winding core and the flexible band can be removed. It can be circulated along the circumference. For this reason, the winding apparatus and winding method of the present invention can prevent the edge of the tubular film from being plastically deformed when the tubular film is wound around the peripheral surface of the core.

  According to the winding device and the winding method of the present invention, in the step of winding the tubular film around the circumferential surface of the core in accordance with the rotation of the core by the rotating unit and the traveling of the flexible band by the traveling unit. An air flow is generated that presses the cylindrical film against the peripheral surface of the core. This air flow can suppress the tubular film from warping in the direction away from the peripheral surface of the core due to its elastic force.

  In addition, in a state where the flexible band is pressed against the peripheral surface of the core, the distance for guiding the cylindrical film sandwiched between the peripheral surface of the core and the flexible band is the circumference of the peripheral surface of the core. It is preferable to correspond to 2/3 or more of the length. This is advantageous in bending the cylindrical film along the peripheral surface of the core against the elastic force.

The side view which shows arrangement | positioning with the winding apparatus which concerns on embodiment of this invention, and a winding apparatus. The perspective view of the guide arm applied to the winding apparatus which concerns on embodiment of this invention. The side view which shows the structure which connected the drive source to the guide arm applied to the winding apparatus which concerns on embodiment of this invention. The side view which shows 1st operation | movement of the winding apparatus which concerns on embodiment of this invention. The side view which shows the 2nd operation | movement of the winding apparatus which concerns on embodiment of this invention. The side view which shows the 3rd operation | movement of the winding apparatus which concerns on embodiment of this invention. The side view which shows the 4th operation | movement of the winding apparatus which concerns on embodiment of this invention. The side view explaining the effect | action by the 4th operation | movement of the winding apparatus which concerns on embodiment of this invention. The side view explaining the effect | action of the jet means applied to the winding apparatus which concerns on embodiment of this invention. The side view which shows the outline of the winding apparatus of a prior art example. (A) is a perspective view of the cylindrical film wound up by the winding core, (b) is the arrow XX sectional drawing.

  FIG. 1 shows a main part of a winding device 7 and a winding device 9 for winding a flat tubular film 1 around a peripheral surface 5 of a core 3. The winding device 9 does not characterize the present invention. The driving source described below means an air cylinder, an electric motor, or a rotating machine. Since the drive source, the housing, and the bearing are self-explanatory, their illustration is omitted. In addition, some elements of the winding device 7 and the winding device 9 overlap in the drawing, but there are also those in which the positions are different from each other in the axial direction of the winding core 3.

  The winding device 7 includes a rotating means 11 that rotates the winding core 3 in the direction of the arrow θ, two guide rollers 13 that are separated from each other by a distance larger than the diameter of the winding core 3, and a plurality of guide rollers 13 and 15. A guide arm 17 to be supported, a flexible band 19 wound around a plurality of guide rollers 13 and 15, a traveling means 21 for causing the flexible band 19 to travel in the direction of arrow f, and a proximity means 23 are provided.

  In the process of running a flat single film, the tubular film 1 is formed by folding the film so that both edges in the width direction perpendicular to the running direction overlap each other and bonding the both edges. The cylindrical film 1 manufactured in this way is wound around a guide roller 25 and a tension roller 27 that is displaceable in the horizontal direction, and travels from the right side in the figure toward the core 3. Thereby, the cylindrical film 1 is continuously supplied to the core 3.

  The proximity means 23 is an air cylinder attached to the casing of the winding device 7 in an inclined posture, and a roller 31 is provided at the tip of the piston rod 29. When the piston rod 29 moves forward to the core 3, the roller 31 is pressed against the cylindrical film 1, and the cylindrical film 1 can be bent so as to be close to the peripheral surface 5 of the core 3. The rotating means 11 detachably holds the core 3 by chucks or the like provided at both ends 34 and 36 of the turning arm 33 of the winding device 9, and rotates the core 3 together with the chuck and the like by a drive source. .

  The flexible band 19 is omitted in FIGS. As shown in FIG. 2, the plurality of guide rollers 13 and 15 are supported on the guide arm 17 by pins 35, 37 and 39, respectively. The guide arm 17 includes a first knot portion 41 in which two substantially L-shaped steel plates are connected by a plurality of pins 39, a second knot portion 43 in which two arch-shaped steel plates are connected by a plurality of pins 37, and a joint 45. With. A pin 47 penetrating the upper end of the first knot 41 is supported by the casing of the winding device 7, and the first knot 41 of the guide arm 17 can turn around the pin 47. The joint 45 is configured such that the second knuckle 43 can pivot with respect to the first knuckle 41 around a pin 49 passing through both of them.

  As shown in FIG. 1, the traveling means 21 has a flexible belt 19 wound around a drive roller 51, a guide roller 53, and a tension roller 55 that can be displaced in the vertical direction. The flexible band 19 is an endless band having a narrower width than the tubular film 1. When the drive source rotates the drive roller 51, the flexible belt 19 travels between the two guide rollers 13 in the direction of the arrow f. Due to the tension applied to the flexible belt 19 by the tension roller 55, the flexible belt 19 is moderately tensioned between the plurality of guide rollers 13 and 15.

  Further, the winding device 7 includes an operation means 57 and a turning means 59 shown in FIG. The operating means 57 is an air cylinder supported by the casing of the winding device 7, and the piston rod 61 is connected to a crank 63 fixed to the pin 47. As the piston rod 61 advances and retreats, the first joint 41 of the guide arm 17 turns in the direction indicated by the arrows a and b. The turning means 59 is an air cylinder supported by the first knuckle section 41 and is connected to a crank 67 whose piston rod 65 is fixed to the pin 49. As the piston rod 65 advances and retreats, the second node 43 turns in the direction indicated by the arrows c and d with respect to the first node 41.

  Next, the winding method of the present invention will be described. The following English letters at the beginning of the sentence are indicators for distinguishing the operations of the winding device 7 and the winding device 9. The operation of the winding device 7 is assumed to be performed by the computer controlling the drive source described above based on a program written in a storage medium accessible by the computer.

  A: The operating means 57 shown in FIG. 3 turns the first node 41 of the guide arm 17 to the limit of the direction of the arrow b, and the turning means 59 moves the second node 43 with respect to the first node 41 by the arrow d. Turn to the limit of the direction. In this state, as shown in FIG. 1, the flexible band 19 that is tensioned between the two guide rollers 13 faces the peripheral surface 5 of the core 3, and the peripheral surface 5 of the core 3 and the flexible band 19 A gap for supplying the tubular film 1 is ensured between them. The rotating film 11 rotates the winding core 3 in the direction of the arrow θ, so that the tubular film 1 is wound around the winding core 3.

  B: As shown in FIG. 4, the winding device 9 turns the turning arm 33 by 180 ° in the direction of arrow α, the winding core 3 held by one end 34 of the turning arm 33, and the other end 36 of the turning arm 33. And replace each other. When the tubular film 1 wound on the core 3 reaches a desired length, the rotating means 11 stops the rotation of the core 3. Reference numeral 69 indicates a guide roller supported by the turning arm 33.

  The supply of the tubular film 1 is stopped. That is, the production of the tubular film 1 is not interrupted, and the tubular film 1 is retained by an accumulator or the like installed in the travel of the tubular film 1 and the traveling of the tubular film 1 is stopped. During this time, the winding device 7 and the winding device 9 perform the following steps.

  C: As shown in FIG. 5, a new winding core 3 is prepared at the other end 36 of the turning arm 33 by a robot or the like, and this winding core 3 is held by a chuck or the like provided at the other end 36 of the turning arm 33. A cutter or the like not shown in the figure cuts the tubular film 1 below the other end 36 of the swivel arm 33, and the tubular film 1 supplied between the flexible band 19 and the peripheral surface 5 of the core 3 is removed. The proximity means 23 is brought close to the peripheral surface 5 of the core 3.

  On the other hand, the rotating means 11 rotates the winding core 3 at one end 34 of the turning arm 33 again, and the end 71 of the tubular film 1 cut as described above is wound around the winding core 3. Stop rotation. Thereafter, the core 3 around which the tubular film 1 is wound is detached from the one end 34 of the turning arm 33 and carried out to another place by a robot or the like.

  D: The flexible belt 19 in which the operating means 57 shown in FIG. 3 turns the first knot 41 of the guide arm 17 in the direction of the arrow a and is tensioned between the two guide rollers 13 as shown in FIG. Is pressed against the peripheral surface 5 of the core 3. Thus, the tubular film 1 is sandwiched between the peripheral surface 5 of the winding core 3 and the flexible band 19, and the flexible band 19 is bent along the peripheral surface 5 in an arc shape.

  E: The turning means 59 shown in FIG. 3 turns the second joint 43 in the direction of the arrow c with respect to the first joint 41. As a result, as shown in FIGS. 7 and 8, the guide roller 13 supported by the second knot 43 further approaches the peripheral surface 5 of the core 3, so that the flexibility is pressed against the peripheral surface 5 of the core 3. The length of the band 19 is 2/3 or more of the circumferential length of the circumferential surface 5. This is advantageous for bending the tubular film 1 along the peripheral surface 5 of the core 3 against its elastic force.

  F: The rotating means 11 rotates the winding core 3 in the direction of the arrow θ, and the running means 21 runs the flexible belt 19 at a speed approximately 10 to 35% faster than the circumferential speed of the winding core 3. As a result, the tubular film 1 sandwiched between the peripheral surface 5 of the core 3 and the flexible band 19 is caused to follow the rotation of the core 3 and the travel of the flexible band 19, as shown in FIG. It can be made to circulate around the peripheral surface 5 of the core 3. Furthermore, the end 73 of the tubular film 1 is wound on the tubular film 1 wound around the peripheral surface 5 of the core 3. Immediately after this, the supply of the tubular film 1 is resumed, and the winding device 7 can execute the process A.

  According to the winding device 7 and the winding method described above, the flexible band 19 is pressed against the peripheral surface 5 of the core 3, so that the gap between the peripheral surface 5 of the core 3 and the flexible band 19 is reached. The tubular film 1 can be sandwiched. For this reason, the tubular film 1 does not receive a force that is forcibly pushed between the peripheral surface 5 of the core 3 and the flexible band 19.

  Further, according to the winding device 7 and the winding method, the cylindrical film 1 sandwiched between the peripheral surface 5 of the winding core 3 and the flexible band 19 is wound around the winding core 3 in the above step F. It can be circulated along the surface 5. Thereby, when winding the cylindrical film 1 around the perimeter of the peripheral surface 5 of the core 3, it can prevent that the edge part of the cylindrical film 1 deforms plastically.

  In addition, since the width of the flexible film 19 is narrower than that of the tubular film 1, the width of the tubular film 1 with the tubular film 1 sandwiched between the peripheral surface 5 of the core 3 and the flexible film 19. The flexible band 19 can be positioned inward from the edge in the direction. Thereby, it can prevent that compressive force is added to the edge of the cylindrical film 1. FIG.

  Furthermore, as shown in FIG. 9, the winding device 7 preferably includes jet means 75 that generates an airflow that presses the tubular film 1 against the peripheral surface 5 of the core 3. The jet means 75 is attached to the tip of the second knuckle section 43 with a nozzle 77 opened toward the substantial center of the core 3, and the compressed air supplied from the compressor or the like to the nozzle 77 in the step F is used as an air flow. This is sprayed onto the tubular film 1. This air flow can suppress the tubular film 1 from warping in the direction away from the peripheral surface 5 of the core 3 due to its elastic force.

  It should be noted that the present invention can be carried out in a mode in which various improvements, modifications, or variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Although the tubular film 1 is described as having both edges of a flat single film adhered, it may be seamless and endless. The proximity means 23 may be omitted, and the tubular film 1 may be hung down by its own weight in the vicinity of the core 3 in the step A. It is sufficient that the length of the flexible band 19 pressed against the peripheral surface 5 of the core 3 in the step E is ½ or more of the peripheral length of the peripheral surface 5 of the core 3. The joint 45 of the guide arm 17 may be omitted, and the relative position of the two guide rollers 13 may be fixed.

  The tubular film 1 may be provided with a color, a pattern, or a pattern. For example, when a plurality of symbols arranged in the direction in which the tubular film 1 travels are printed on the tubular film 1 by the traveling means 21 and there is a blank space between these symbols, It is desirable to cut the blank part. Therefore, a sensor or the like for detecting the design of the tubular film 1 or a blank space is installed below the other end 36 of the swivel arm 33 shown in FIG.

  A point e in FIG. 4 indicates a position where a cutter or the like cuts into the tubular film 1. Immediately after the winding device 9 finishes the turning of the turning arm 33 in the process B, the computer moves the tension roller 27 to the right side in the drawing by the drive source. Accordingly, the tubular film 1 is pulled back to the tension roller 27, and the computer stops the tension roller 27 based on the signal sent from the sensor or the like when the margin position of the tubular film 1 matches the point e. . At this time, a cutter or the like cuts the tubular film 1.

  The speed at which the rotating means 11 rotates the core 3 in the process F and the speed at which the traveling means 21 travels the flexible belt 19 are the type, material, thickness, hardness, and the core 3 of the tubular film 1. It is a design value determined by the material and the like, and each speed may be determined appropriately according to the setting conditions. The configuration of the jet means 75 is not particularly limited, and in consideration of the film type, surface roughness, winding diameter, thickness, charge amount, etc. of the tubular film 1, the direction, strength of the air flow generated by the jet means 75, or The presence or absence may be determined as appropriate.

  The present invention is not limited to a cylindrical film, and is a technique useful for winding a belt-like object made of any material around a shaft or the like.

  DESCRIPTION OF SYMBOLS 1,115 ... Cylindrical film, 3,103 ... Core, 5,109 ... Peripheral surface, 7,105 ... Winding device, 9 ... Winding device, 11 ... Rotating means, 13, 15, 25, 53, 69 ... guide roller, 17 ... guide arm, 19,111 ... flexible band, 21 ... running means, 23 ... proximity means, 27 , 55 ... tension roller, 29, 61, 65 ... piston rod, 31 ... roller, 33 ... swivel arm, 34 ... one end, 36 ... other end, 35, 37, 39 , 47, 49 ... pin, 41 ... first joint, 43 ... second joint, 45 ... joint, 51 ... drive roller, 57 ... operating means, 59 ... Rotating means, 63, 67 ... crank, 71, 73, 113 ... end, 75 ... jetting means, 77 ... nozzle, 101 ... film, 107 ... guide member, 117 ... the edge.

Claims (11)

A winding device for winding a flat tubular film around a circumferential surface of a core,
A rotating means for rotating the winding core;
A plurality of guide rollers spaced apart from each other by a distance wider than the winding core;
A guide arm that supports the plurality of guide rollers;
A flexible band wound around the plurality of guide rollers and facing the core;
Traveling means for traveling the flexible strip in the direction in which the winding core rotates;
An operation means for moving the guide arm relative to the winding core to press the flexible band against the circumferential surface of the winding core or to disengage it from the circumferential surface of the winding core;
In the state where the operating means has detached the flexible band from the peripheral surface of the core, a tubular film is supplied between the peripheral surface of the core and the flexible band,
When the operating means presses the flexible band against the circumferential surface of the core, a cylindrical film is sandwiched between the circumferential surface of the core and the flexible band, and the flexible band is copied to the circumferential surface. And bent into an arc having a length corresponding to ½ or more of the circumferential length of the circumferential surface,
A cylindrical film sandwiched between the circumferential surface of the winding core and the flexible band is caused to follow the rotation of the winding core by the rotating means and the traveling of the flexible band by the traveling means, and the circumferential surface of the winding core A winding device characterized by being wound around.   The winding device according to claim 1, further comprising jet means for generating an airflow that presses the cylindrical film against a peripheral surface of the core.   The guide arm includes a first knot that supports one of the plurality of guide rollers, a second knot that supports another guide roller of the plurality of guide rollers, the first knot, The winding device according to claim 1, further comprising a joint that pivotably connects the second knuckle portions to each other.   By swiveling the second knuckle in the direction of advancing to the circumferential surface of the core with respect to the first knuckle, the flexible band pressed against the circumferential surface of the core is made to follow the circumferential surface. The winding device according to claim 3, wherein the winding device is bent into an arc shape having a length corresponding to 2/3 or more of the circumferential length of the circumferential surface.   5. The apparatus according to claim 1, further comprising proximity means for bringing a cylindrical film supplied between the peripheral surface of the core and the flexible band into proximity to the peripheral surface of the core. Winding device.   The winding device according to any one of claims 1 to 5, wherein the traveling means causes the flexible belt to travel at a speed faster than a peripheral speed at which the winding core rotates.   The winding device according to any one of claims 1 to 6, wherein the flexible band has a narrower width than the cylindrical film. A winding method for winding a flat tubular film around a peripheral surface of a core,
A step of causing a flexible band wound around a plurality of guide rollers separated from each other by a distance wider than the winding core to face the peripheral surface of the winding core;
Supplying a tubular film between the peripheral surface of the core and the flexible band;
By pressing the flexible band against the circumferential surface of the winding core, a cylindrical film is sandwiched between the circumferential surface of the winding core and the flexible band, and the flexible band is made to follow the circumferential surface. A step of bending in an arc;
Rotating the winding core and running the flexible band in a direction in which the winding core rotates;
From the step of winding the cylindrical film sandwiched between the circumferential surface of the core and the flexible band, around the circumferential surface of the core according to the rotation of the core and the travel of the flexible band A winding method characterized by comprising:   In the step of winding the cylindrical film around the peripheral surface of the core in accordance with the rotation of the core and running of the flexible band, generating an air flow that presses the cylindrical film against the peripheral surface of the core. The winding method according to claim 8, wherein the winding method is characterized.   By pressing a flexible band on the circumferential surface of the core, the flexible band is made to follow the circumferential surface and has an arc shape with a length corresponding to 1/2 to 2/3 or more of the circumferential length of the circumferential surface The winding method according to claim 8 or 9, wherein the winding method is bent.   The winding method according to any one of 8 to 10, wherein the flexible belt is caused to travel at a speed faster than a peripheral speed of the winding core.

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