A film material tension regulating device

Abstract

The embodiment of the present invention provides a film material tension adjustment device, which relates to the field of film tension detection technology. The film material tension adjustment device includes a base, a winding support, an unwinding support, a driving assembly and an adjusting roller assembly. The driving assembly is installed on the base, and is used to drive the unwinding support or the winding support to move in the left-right direction. The adjusting roller assembly is installed on the unwinding support or the winding support, and the adjusting roller assembly extends in the left-right direction; the two ends of the adjusting roller assembly can move relative to each other in the up-down direction and / or the front-back direction. The driving assembly can drive the winding support or the unwinding support to move in the left-right direction, thereby driving the winding member and the unwinding member to move in the left-right direction, so that the film materials on the winding member and the unwinding member are aligned; the adjusting roller assembly can support the film material, and the two ends of the adjusting roller assembly can move relative to each other in the up-down direction and / or the front-back direction, thereby adjusting the tension of the film material relative to the two edges.

Description

Technical Field

[0001] The present invention relates to the technical field of film tension detection, and in particular to a film material tension regulating device. Background Art

[0002] In the prior art, battery membrane materials (such as copper foil, aluminum foil, and separator) usually need to undergo strict unwinding inspection before use to ensure that their quality meets the requirements of the production process. This process mainly includes inspections of surface defects and thickness uniformity of the membrane materials. In order to complete these inspections, the membrane material must be reeled and unreeled so that its characteristics over the entire length can be observed. However, in actual operation, the rewound membrane material often encounters problems such as inconsistent sizes at both ends and failure to fully align the edges. These problems not only increase the difficulty of subsequent processing, but may also cause interlayer separation and folding of the membrane material during use, which seriously affects the safety and performance of the battery. In addition, this inconsistency will also lead to reduced production efficiency, increased production costs, and thus affect the overall market competitiveness of the product.

[0003] Therefore, how to effectively solve the problem of inconsistent sizes at both ends and edge alignment after the film is rolled up has become an important issue that needs to be urgently addressed in the battery manufacturing industry. Summary of the invention

[0004] The present invention provides a film material tension regulating device, which can regulate the sizes of two ends of a film material after it is rolled up and can align the edges of the film material, thereby facilitating the subsequent use of the film material.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] An embodiment of the present invention provides a film material tension adjustment device, which includes:

[0007] Base;

[0008] A winding support;

[0009] an unwinding support, wherein at least one of the unwinding support and the winding support is slidably connected to the base;

[0010] A driving assembly, the driving assembly being mounted on the base and used for driving the unwinding support or the winding support to move in a left-right direction;

[0011] An adjusting roller assembly is installed on the unwinding support or the winding support, and the adjusting roller assembly extends in the left-right direction; both ends of the adjusting roller assembly can move relatively in the up-down direction and / or the front-back direction.

[0012] Optionally, the adjusting roller assembly includes an adjusting roller and an adjusting seat, the adjusting seat is connected to the end of the adjusting roller, the adjusting roller is used to support the film material, the adjusting seat is installed on the unwinding support or the winding support, and the adjusting seat is used to drive the adjusting roller to move relative to each other in the up and down direction and / or the front and back direction.

[0013] Optionally, there are two adjustment seats, and the two adjustment seats are respectively connected to two ends of the adjustment roller.

[0014] Optionally, the adjustment seat includes a mounting plate, a roller seat, a threaded shaft and two bearing seats, the mounting plate is mounted on the unwinding support or the winding support, the two bearing seats are mounted on the mounting plate and are spaced apart, the threaded shaft and the roller seat are both arranged between the two bearing seats, the roller seat is provided with an internal thread, the roller seat and the threaded shaft are connected by threads, the threaded shaft is used to drive the roller seat to move relative to each other in the up and down directions and / or front and back directions when rotating, the adjusting roller is arranged between the two bearing seats, and the adjusting roller is mounted on the roller seat.

[0015] Optionally, the adjustment seat further includes a second guide rail, the second guide rail is mounted on the mounting plate, and the roller seat and the second guide rail are slidably connected.

[0016] Optionally, one end of the threaded shaft extends out of the bearing seat, and a knob is provided at the end of the threaded shaft extending out of the bearing seat.

[0017] Optionally, the film material tension adjustment device further comprises a first guide rail, the first guide rail is mounted on the base, the unwinding support or the winding support is arranged on the first guide rail, and is used to move along the first guide rail under the drive of the driving assembly.

[0018] Optionally, the film material tension adjustment device also includes an offset detection sensor and a guide rod, the guide rod is installed on the unwinding support or the winding support, the offset detection sensor is movably installed on the guide rod, and the offset detection sensor is used to detect the lateral displacement change of the film material on the unwinding support or the winding support.

[0019] Optionally, the film material tension adjustment device further comprises a contour detection component, wherein the contour detection component is mounted on the unwinding support or the winding support, and the contour detection component is used to detect contour changes of the film material on the unwinding support or the winding support.

[0020] Optionally, the film material tension adjustment device also includes a tension detection member and a tension adjustment member, and both the tension detection member and the tension adjustment member are installed on the unwinding support member or the winding support member. The tension detection member is used to detect the tension of the film material, and the tension adjustment member is used to adjust the longitudinal tension of the film material.

[0021] The beneficial effects of the film material tension adjustment device of the embodiment of the present invention include, for example:

[0022] The film material tension adjustment device includes a base, a winding support, an unwinding support, a driving assembly and an adjusting roller assembly. The driving assembly is installed on the base and is used to drive the unwinding support or the winding support to move in the left-right direction. The adjusting roller assembly is installed on the unwinding support or the winding support, and the adjusting roller assembly extends in the left-right direction; the two ends of the adjusting roller assembly can move relative to each other in the up-down direction and / or the front-back direction. When in use, the unwinding support is used to support the unwinding member, and the winding support is used to support the winding member. At least one of the unwinding support and the winding support is installed on the base. During the unwinding and unwinding process, the driving component can drive the winding support or the unwinding support to move in the left and right directions, thereby driving the winding member and the unwinding member to move in the left and right directions, so that the film materials on the winding member and the unwinding member are aligned, thereby ensuring that the edges of the two sides of the film material after winding are in an aligned state; the adjusting roller assembly is installed on the unwinding support or the winding support, and the adjusting roller assembly extends in the left and right directions. The adjusting roller assembly can support the film material, and the two ends of the adjusting roller assembly can move relatively in the up-down direction and / or the front-back direction, thereby adjusting the tension of the film material relative to the two edges, so that the tension of the two edges of the film material is consistent, avoiding the phenomenon that the two ends of the film material are inconsistent in size. The subsequent use of the film material is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of the film material tension adjustment device provided in this embodiment;

[0025] Figure 2 A schematic diagram of the structure of the adjusting roller assembly provided in this embodiment;

[0026] Figure 3 A schematic diagram of the structure of the adjustment base provided in this embodiment from a first viewing angle;

[0027] Figure 4 A schematic diagram of the structure of the adjustment base provided in this embodiment from a second viewing angle;

[0028] Figure 5 A schematic diagram of the structure of the contour detection element provided in this embodiment;

[0029] Figure 6 A schematic diagram of the structure of the offset detection sensor and the guide rod provided in this embodiment;

[0030] Figure 7 This is a schematic structural diagram of the tension adjusting member provided in this embodiment.

[0031] Icons: 10-base; 20-unwinding support; 30-winding support; 40-driving assembly; 42-first guide rail; 43-offset detection sensor; 44-guide rod; 50-adjusting roller assembly; 51-adjusting roller; 52-adjusting seat; 521-mounting plate; 522-roller seat; 523-bearing seat; 524-second guide rail; 525-threaded shaft; 526-knob; 527-locking piece; 60-contour detection piece; 61-third guide rail; 62-distance sensor; 63-driver; 70-tension detection piece; 80-tension adjustment piece; 81-cylinder; 82-swing arm; 83-floating roller. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0037] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0038] In the prior art, battery membrane materials (such as copper foil, aluminum foil, and separator) usually need to undergo strict unwinding inspection before use to ensure that their quality meets the requirements of the production process. This process mainly includes inspections of surface defects and thickness uniformity of the membrane materials. In order to complete these inspections, the membrane material must be reeled and unreeled so that its characteristics over the entire length can be observed. However, in actual operation, the rewound membrane material often encounters problems such as inconsistent sizes at both ends and failure to fully align the edges. These problems not only increase the difficulty of subsequent processing, but may also cause interlayer separation and folding of the membrane material during use, which seriously affects the safety and performance of the battery. In addition, this inconsistency will also lead to reduced production efficiency, increased production costs, and thus affect the overall market competitiveness of the product.

[0039] Therefore, how to effectively solve the problem of inconsistent sizes at both ends and edge alignment after the film is rolled up has become an important issue that needs to be urgently addressed in the battery manufacturing industry.

[0040] Please refer to Figure 1-Figure 7 The present embodiment provides a film material tension adjustment device, which can effectively improve the above-mentioned technical problems, can adjust the size of the two ends of the film material after rolling up, and can align the edges of the film material, thereby facilitating the subsequent use of the film material.

[0041] The film material tension adjustment device includes a base 10, a winding support 30, an unwinding support 20, a driving assembly 40 and an adjusting roller assembly 50. At least one of the unwinding support 20 and the winding support 30 is slidably connected to the base 10. The driving assembly 40 can be slidably installed on the base 10. The driving assembly 40 is connected to the winding support 30 or the unwinding support 20. The driving assembly 40 is used to drive the unwinding support 20 and the winding support 30 to move in the left and right directions to achieve alignment of the film material on the winding support 30 with the film material on the unwinding support 20. The adjusting roller assembly 50 is installed on the unwinding support 20 or the winding support 30. The two ends of the adjusting roller assembly 50 can move relative to each other in the up and down directions and / or the front and back directions to adjust the tension of the film material relative to the two edges.

[0042] In this embodiment, the left-right direction in which the driving assembly 40 is used to drive the unwinding support 20 and the winding support 30 to move refers to a direction perpendicular to the moving direction of the film material.

[0043] In this embodiment, the unwinding support 20 is used to support the unwinding member, the winding support 30 is used to support the winding member, and the driving assembly 40 drives the unwinding support 20 to move in the left and right direction. In other embodiments, the driving assembly 40 can drive the winding support 30 to move in the left and right direction, which is not specifically limited here.

[0044] It is understandable that during the unwinding and winding process, the film material may deviate, resulting in the misalignment of the edge of the last wound film material. In order to avoid the above phenomenon, the film material tension adjustment device provided in this embodiment includes a first guide rail 42, the first guide rail 42 is installed on the base 10, the drive assembly 40 is connected to the unwinding support 20 or the winding support 30, the unwinding support 20 or the winding support 30 is arranged on the first guide rail 42, and the unwinding support 20 or the winding support 30 is used to move along the first guide rail 42 under the drive of the drive assembly 40.

[0045] Specifically, there are two first guide rails 42, and the two first guide rails 42 are arranged at intervals on the base 10. The setting direction of the first guide rails 42 is perpendicular to the moving direction of the film material. The bottom of the unwinding support 20 is installed on the two first guide rails 42. When correction is required, the driving assembly 40 drives the unwinding support 20 to move along the first guide rails 42, so that the unwinding support 20 moves in the left and right direction until the film material on the unwinding support 20 is aligned with the film material on the winding support 30.

[0046] Please refer to Figure 1 and Figure 6In order to accurately obtain the offset information of the film material, the film material tension adjustment device also includes an offset detection sensor 43 and a guide rod 44. The guide rod 44 is installed on the unwinding support 20 or the winding support 30. The offset detection sensor 43 is movably installed on the guide rod 44. The offset detection sensor 43 is used to detect the lateral displacement change of the film material on the unwinding support 20 or the winding support 30. Specifically, the guide rod 44 is installed on the unwinding support 20, and the offset detection sensor 43 detects the position change of the film material unwound by the unwinding support 20. When the offset detection sensor 43 detects the position change of the film material, it sends a correction signal to the external controller, and the external controller controls the driving component 40 to drive the unwinding support 20 to move along the first guide rail 42, so as to perform the correction work.

[0047] Furthermore, when it is necessary to perform position detection on film materials of different widths, the offset detection sensor 43 can adapt to film materials of different widths by sliding along the guide rod 44, thereby performing position detection, which is more applicable.

[0048] In this embodiment, the driving component 40 is a driving electric cylinder. In other embodiments, the driving component 40 can also be a driving cylinder or a driving screw, etc., which is not specifically limited here.

[0049] Please refer to Figure 1-Figure 4 The adjusting roller assembly 50 includes an adjusting roller 51 and an adjusting seat 52. The adjusting seat 52 is connected to the end of the adjusting roller 51. The adjusting roller 51 is used to support the film material. The adjusting seat 52 is installed on the unwinding support 20 or the winding support 30. The adjusting seat 52 is used to drive the adjusting roller 51 to move relative to each other in the up-down direction and / or the front-back direction. Specifically, the adjusting seat 52 is installed on the unwinding support 20. The adjusting seat 52 can realize multi-angle movement of the adjusting roller 51, thereby providing the most matching angle adjustment for the film material.

[0050] In this embodiment, there are two adjustment seats 52, and the two adjustment seats 52 are respectively connected to the two ends of the adjustment roller 51, one of the adjustment seats 52 drives the adjustment roller 51 to move forward and backward, and the other adjustment seat 52 drives the adjustment roller 51 to move up and down. In other embodiments, the number of adjustment seats 52 can be increased or decreased according to actual production conditions, and is not specifically limited here.

[0051] by Figure 2 The relative positions of the adjusting rollers 51 and 52 are described below. The adjusting seat 52 at the left end drives the adjusting roller 51 to move forward and backward, and the adjusting seat 52 at the right end drives the adjusting roller 51 to move up and down.

[0052] It should be noted that the adjustment seat 52 includes a mounting plate 521, a roller seat 522, a second guide rail 524, a threaded shaft 525 and two bearing seats 523. The mounting plate 521 is installed on the unwinding support 20 or the winding support 30. The two bearing seats 523 are installed on the mounting plate 521 and are arranged at intervals. The roller seat 522 and the threaded shaft 525 are both arranged between the two bearing seats 523. The roller seat 522 is provided with an internal thread. The threaded shaft 525 and the roller seat 522 are threadedly connected. The threaded shaft 525 is used to drive the roller seat 522 to move relative to each other in the up and down direction and / or the front and back direction when rotating. The adjusting roller 51 is arranged between the two bearing seats 523, and the adjusting roller 51 is installed on the roller seat 522. The threaded shaft 525 is rotated so that the roller seat 522 threadably matched with it moves relative to each other in the up and down direction and / or the front and back direction, thereby driving the adjusting roller 51 to move.

[0053] Specifically, one end of the threaded shaft 525 extends out of the bearing seat 523 , and a knob 526 is provided at the end of the threaded shaft 525 extending out of the bearing seat 523 , so as to facilitate the rotation of the threaded shaft 525 .

[0054] In this embodiment, the second guide rail 524 is installed on the mounting plate 521, the roller seat 522 and the second guide rail 524 are slidably connected, and the threaded shaft 525 passes through the two bearing seats 523 and the roller seat 522 at the same time. The threaded shaft 525 is used to drive the roller seat 522 to move along the second guide rail 524 when rotating.

[0055] It should also be noted that the adjusting roller assembly 50 further includes a locking member 527, which includes a locking seat and an adjusting rod, the locking seat is connected to any one of the bearing seats 523, the adjusting rod is rotatably disposed on the locking seat, and the locking seat is connected to the threaded shaft 525. During operation, the adjusting rod is rotated so that the locking seat locks the threaded shaft 525, thereby preventing the threaded shaft 525 from being affected by vibration and thus being displaced after the position adjustment of the roller seat 522 is completed, thereby causing the position of the roller seat 522 to change.

[0056] Furthermore, in order to facilitate viewing of the adjustment amount, a position display is provided on the adjustment seat 52 to display the adjustment amount of the roller seat 522 .

[0057] Please refer to Figure 5The film material tension adjustment device further includes a contour detection member 60, which is installed on the unwinding support 20 or the winding support 30. The contour detection member 60 is used to detect the contour change of the film material on the unwinding support 20 or the winding support 30. The contour detection member 60 includes a third guide rail 61, a distance sensor 62 and a driver 63. The distance sensor 62 is slidably arranged on the third guide rail 61. The setting direction of the third guide rail 61 is consistent with the moving direction of the film material. The driver 63 is connected to the distance sensor 62 and is used to drive the distance sensor 62 to move along the third guide rail 61. The distance sensor 62 can detect the distance between the film material and the distance sensor 62, and transmit the distance information to the external controller, which analyzes and determines the tension of the edges on both sides of the film material.

[0058] Please refer to Figure 1 and Figure 7 The film material tension adjustment device also includes a tension detection member 70 and a tension adjustment member 80. The tension detection member 70 and the tension adjustment member 80 are both installed on the unwinding support member 20 or the winding support member 30. The tension detection member 70 is used to detect the tension of the film material, and the tension adjustment member 80 is used to adjust the longitudinal tension of the film material.

[0059] Specifically, the tension detection member 70 is a tension detection roller for supporting the film material. The tension adjustment member 80 includes a cylinder 81, a swing arm 82 and a floating roller 83. The swing arm 82 is connected to the cylinder 81 and the floating roller 83 at the same time. The cylinder 81 drives the floating roller 83 to move through the swing arm 82, thereby adjusting the tension of the film material on the floating roller 83.

[0060] In summary, an embodiment of the present invention provides a film material tension adjustment device, which includes a base 10, a winding support 30, an unwinding support 20, a driving assembly 40 and an adjusting roller assembly 50. The driving assembly 40 is installed on the base 10, and is used to drive the unwinding support 20 or the winding support 30 to move in the left and right directions. The adjusting roller assembly 50 is installed on the unwinding support 20 or the winding support 30, and the adjusting roller assembly 50 extends in the left and right directions; the two ends of the adjusting roller assembly 50 can move relative to each other in the up and down directions and / or the front and back directions. When in use, the unwinding support 20 is used to support the unwinding member, and the winding support 30 is used to support the winding member. At least one of the unwinding support 20 and the winding support 30 is installed on the base 10. During the unwinding and unwinding process, the driving assembly 40 can drive the winding support 30 or the unwinding support 20 to move in the left-right direction, thereby driving the winding member and the unwinding member to move in the left-right direction, so that the film materials on the winding member and the unwinding member are aligned, thereby ensuring that the edges of both sides of the film material after winding are in an aligned state; the adjusting roller assembly 50 is installed on the unwinding support 20 or the winding support 30, and the adjusting roller assembly 50 extends in the left-right direction. The adjusting roller assembly 50 can support the film material, and the two ends of the adjusting roller assembly 50 can move relatively in the up-down direction and / or the front-back direction, thereby adjusting the tension of the film material relative to the two edges, so that the tension of the two edges of the film material is consistent, avoiding the phenomenon that the two ends of the film material are inconsistent in size. The subsequent use of the film material is convenient.

[0061] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A film material tension adjustment device, characterized in that: include: Base (10); A winding support member (30); an unwinding support (20), wherein at least one of the unwinding support (20) and the winding support (30) is slidably connected to the base (10); A driving assembly (40), the driving assembly (40) being mounted on the base (10) and used for driving the unwinding support (20) or the winding support (30) to move in a left-right direction; An adjusting roller assembly (50), wherein the adjusting roller assembly (50) is mounted on the unwinding support (20) or the winding support (30), and the adjusting roller assembly (50) extends in the left-right direction; both ends of the adjusting roller assembly (50) are capable of relative movement in the up-down direction and / or the front-back direction.

2. The film material tension adjustment device according to claim 1, characterized in that: The adjusting roller assembly (50) comprises an adjusting roller (51) and an adjusting seat (52), wherein the adjusting seat (52) is connected to the end of the adjusting roller (51), the adjusting roller (51) is used to support the film material, the adjusting seat (52) is installed on the unwinding support (20) or the winding support (30), and the adjusting seat (52) is used to drive the adjusting roller (51) to move relative to each other in the up-down direction and / or the front-back direction.

3. The film material tension adjustment device according to claim 2, characterized in that: There are two adjustment seats, and the two adjustment seats are connected to two ends of the adjustment roller respectively.

4. The film material tension adjustment device according to claim 2, characterized in that: The adjustment seat (52) comprises a mounting plate (521), a roller seat (522), a threaded shaft (525) and two bearing seats (523); the mounting plate (521) is mounted on the unwinding support (20) or the winding support (30); the two bearing seats (523) are mounted on the mounting plate (521) and are spaced apart; the threaded shaft (525) and the roller seat (522) are both arranged between the two bearing seats (523); the roller seat (522) is provided with an internal thread; the roller seat (522) and the threaded shaft are connected by threads; the threaded shaft (525) is used to drive the roller seat to move relative to each other in the up-down direction and / or the front-back direction when rotating; the adjustment roller (51) is arranged between the two bearing seats (523), and the adjustment roller (51) is mounted on the roller seat (522).

5. The film material tension adjustment device according to claim 4, characterized in that: The adjustment seat (52) further comprises a second guide rail (524), wherein the second guide rail (524) is mounted on the mounting plate (521), and the roller seat (522) and the second guide rail (524) are slidably connected.

6. The film material tension adjustment device according to claim 4, characterized in that: One end of the threaded shaft (525) extends out of the bearing seat (523), and a knob (526) is provided at the end of the threaded shaft (525) extending out of the bearing seat (523).

7. The film material tension adjustment device according to claim 1, characterized in that: The film material tension adjustment device also includes a first guide rail (42), which is installed on the base (10), and the unwinding support (20) or the winding support (30) is arranged on the first guide rail (42) for moving along the first guide rail (42) under the drive of the driving component (40).

8. The film material tension adjustment device according to claim 7, characterized in that: The film material tension adjustment device also includes an offset detection sensor (43) and a guide rod (44), wherein the guide rod (44) is mounted on the unwinding support (20) or the winding support (30), and the offset detection sensor (43) is movably mounted on the guide rod (44), and the offset detection sensor (43) is used to detect the lateral displacement change of the film material on the unwinding support (20) or the winding support (30).

9. The film material tension adjustment device according to any one of claims 1 to 8, characterized in that: The film material tension adjustment device also includes a contour detection component (60), which is installed on the unwinding support (20) or the winding support (30), and the contour detection component (60) is used to detect contour changes of the film material on the unwinding support (20) or the winding support (30).

10. The film material tension adjustment device according to any one of claims 1 to 8, characterized in that: The film material tension adjustment device also includes a tension detection member (70) and a tension adjustment member (80). The tension detection member (70) and the tension adjustment member (80) are both installed on the unwinding support member (20) or the winding support member (30). The tension detection member (70) is used to detect the tension of the film material, and the tension adjustment member (80) is used to adjust the longitudinal tension of the film material.

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