winding device

Abstract

An example of a winding device that allows for a smaller shaft diameter or the elimination of the shaft is disclosed. [Solution] The winding device 1 comprises a belt 3 that contacts the outermost surface of the roll material B2 and rotates the roll material B2, and a belt drive unit that rotates the belt 3. The belt 3 contacts the outermost surface of the roll material B2 and rotates the roll material B2, thereby winding the sheet material B1 to form the roll material B2. Therefore, the winding device 1 may allow for a reduction in the diameter of the shaft or the elimination of the shaft altogether.

Description

Technical Field

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[0001] The present disclosure relates to a winding device for winding a flexible sheet-like member (hereinafter referred to as a sheet material).

Background Art

[0002] For example, the winding device described in Patent Document 1 includes a lower winding roller with a fixed support shaft, an upper and lower winding roller with a support shaft that can be displaced vertically, and a shaft for winding a sheet material (in Patent Document 1, base paper).

[0003] In this winding device, with the tip of the sheet material wound and fixed to the shaft, the shaft rotates, and the base paper is wound onto the shaft. The winding and fixing are realized by spraying water onto the tip of the base paper forming the sheet material.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present disclosure discloses an example of a winding device capable of reducing the diameter of the shaft or eliminating the shaft.

Means for Solving the Problems

[0006] It is desirable for a winding device for winding a flexible sheet-like member to include at least one of the following constituent elements, for example. In other words, the constituent elements are a belt (3) that contacts the outermost surface of the roll material (B2) and rotates the roll material (B2), and a belt drive unit (5) that rotates the belt (3). Furthermore, the radius of curvature of the part of the belt (3) that contacts the roll material (B1) can be expanded in conjunction with the increase in the diameter of the roll material (B1).

[0007] Note that sheet material (B1) refers to the sheet-like component that is to be wound up. Roll material (B2) refers to sheet material (B1) that has been wound in a spiral shape so that the sheet material (B1) overlaps in the thickness direction.

[0008] As a result, in this winding device, the belt (3) contacts the outermost surface of the roll material (B2), and the belt (3) rotates the roll material (B2), causing the sheet material (B1) to be wound up and the roll material (B2) to be formed. Therefore, in this winding device, it may be possible to reduce the diameter of the shaft or even eliminate the shaft altogether.

[0009] The winding device may have, for example, the following configuration. In other words, the winding device may be equipped with a first guide roller (7) and a second guide roller (9) that guide the movement of the belt (3) such that the portion of the belt (3) that contacts the roll material (B2) forms a roughly C-shaped annular portion (3A).

[0010] Furthermore, the first guide roller (7) and the second guide roller (9) are positioned on the opening (3B) side of the annular portion (3A), and it is desirable that the first guide roller (7) is positioned on one side of a virtual line (Lo) that coincides with the opening direction of the opening (3B), and the second guide roller (9) is positioned on the other side of the virtual line (Lo).

[0011] Furthermore, the winding device may have a contact portion (13A) that contacts the belt (3), and may also be equipped with a path changing mechanism (13) that can change or adjust the movement path of the belt (3). Furthermore, it is desirable that the contact portion (13A) displaces so as the outer diameter of the annular portion (3A) increases. This makes it possible for the winding device to enlarge the inner diameter of the annular portion (3A) as the sheet material (B1) is wound up.

[0012] Furthermore, it is desirable that the winding device be equipped with a restricting part (15) that restricts the position of the annular part (3A) so that the annular part (3A) is located on one side of the virtual line (Lo). This makes it possible to reliably round and wind the leading end of the sheet material (B1) at the start of winding.

[0013] Furthermore, the winding device is equipped with a feed roller (11) that contacts the sheet material (B1) and feeds the sheet material (B1) to the annular section (3A), and it is desirable that the feed roller (11) be provided on one side and the other side of the annular section (3A) in the width direction.

[0014] As a result, the winding device may be able to feed the sheet material (B1) into the annular section (3A) without the sheet material (B1) tilting relative to the feeding direction. The width direction refers to, for example, the direction parallel to the central axis of the roll material (B2).

[0015] Furthermore, the feed roller (11) may be configured to include a first feed roller (11A, 11B) positioned on one side of the imaginary line (Lo), and a second feed roller (11C, 11D) positioned on the other side of the imaginary line (Lo).

[0016] Furthermore, it is desirable that the frictional force generated at the contact point between the first feed rollers (11A, 11B) and the sheet material (B1) be smaller than the frictional force generated at the contact point between the second feed rollers (11C, 11D) and the sheet material (B1).

[0017] As a result, in the winding device, even when the outer peripheral surface of the roll material (B2) comes into contact with the first feed rollers (11A, 11B), the rotation of the belt (3) is suppressed from being inhibited, and the sheet material (B1) can be reliably fed out.

[0018] In addition, when the widthwise dimension of the belt (3) is smaller than the widthwise dimension of the sheet material (B1), it is desirable to provide a tension generating portion (17) that sandwiches one end side and the other end side in the width direction of the sheet material (B1) and pulls the sheet material (B1) in the width direction to generate tension in the sheet material (B1).

[0019] As a result, even for a sheet material (B1) having a large widthwise dimension, the winding device can reliably wind up the sheet material (B1). Furthermore, it is desirable that the belt (3) is a toothed belt provided with irregularities on the side opposite to the surface in contact with the roll material (B2). Thereby, it can be suppressed that the belt (3) slips with respect to the belt driving portion (5).

[0020] Incidentally, the reference numerals in each of the above parentheses are an example showing the correspondence relationship with the specific configurations and the like described in the embodiments to be described later, and the present disclosure is not limited to the specific configurations and the like indicated by the reference numerals in the above parentheses.

Brief Description of the Drawings

[0021] [Figure 1] It is a diagram showing an overview of a winding device according to the first embodiment. [Figure 2] It is a diagram showing an overview of the structure of a winding device according to the first embodiment. [Figure 3] It is a diagram showing an overview of the structure of a winding device according to the first embodiment.

Modes for Carrying Out the Invention

[0022] The following "Embodiments of the Invention" show an example of an embodiment belonging to the technical scope of the present disclosure. That is, the invention-specific matters described in the claims are not limited to the specific configurations, structures, etc. shown in the following embodiments.

[0023] This embodiment is an example in which the winding device according to the present disclosure is applied to a winding device that winds up the bag body of a curtain-type airbag mounted on a vehicle such as a car. The bag body is an example of a flexible sheet-like member.

[0024] Hereinafter, the bag body is referred to as a sheet material B1 (see FIG. 3). A roll material B2 (see FIG. 3) is a material wound in a spiral so that the sheet material B1 overlaps in the thickness direction. Incidentally, the arrows, slashes, etc. indicating the directions attached to the following figures are described to facilitate understanding of the relationship between the figures and the shape of the members or parts. Therefore, the winding device is not limited to the directions attached to the figures.

[0025] The directions shown in each figure are the directions in the state where the winding device according to this embodiment is installed at the manufacturing site. The figures with slashes do not always show cross-sectional views. At least one member or part described with a reference sign is provided at least one, unless specified as "one".

[0026] That is, when there is no specification such as "one", two or more of such members may be provided. The winding device shown in the present disclosure includes at least one of the components such as the members or parts described with reference signs and the structural parts shown in the drawings.

[0027] (First Embodiment) <1. Configuration of the Winding Device> As shown in FIG. 1, the winding device 1 includes at least a belt 3, a belt drive unit 5 (see FIG. 2), a first guide roller 7, a second guide roller 9, a feed roller 11 (see FIG. 2), a path changing mechanism 13, a regulating unit 15, and a tension generating unit 17 (see FIG. 2).

[0028] <Belt> As shown in Figure 3, belt 3 is a track that contacts the outermost surface of the roll material B2 and rotates the roll material B2. In this embodiment, belt 3 is a toothed belt with irregularities on the side opposite to the surface that contacts the roll material B2.

[0029] As shown in Figure 1, the belt 3 is stretched across the first guide roller 7, the second guide roller 9, and the intermediate roller 13A of the path changing mechanism 13. The first guide roller 7, the second guide roller 9, and the intermediate roller 13A are examples of path guide members that guide the movement path of the belt 3.

[0030] Incidentally, in this embodiment, as shown in Figure 2, the widthwise dimension Wb of the belt 3 is smaller than the widthwise dimension Ws of the sheet material B1. The widthwise direction refers to the direction parallel to the central axis of the roll material B2, or to the shaft portions 7A and 9A of the first guide roller 7 and the second guide roller 9, respectively.

[0031] <Guidance roller> The first guide roller 7 and the second guide roller 9 guide the movement of the belt 3 so that an annular portion 3A is formed by the belt 3, as shown in Figure 3. The annular portion 3A is the part of the belt 3 that comes into contact with the roll material B2, and is the part that is "partially open annular," that is, the "approximately C-shaped" part.

[0032] Specifically, as shown in Figure 1, the first guide roller 7 and the second guide roller 9 are positioned on the side of the opening 3B of the annular portion 3A, that is, on the opposite side of the intermediate roller 13A with the annular portion 3A in between.

[0033] The first guide roller 7 is positioned on one side of the virtual line Lo (above the virtual line Lo in Figure 1). The second guide roller 9 is positioned on the other side of the virtual line Lo (below the virtual line Lo in Figure 1).

[0034] The virtual line Lo is a virtual line (a line indicating a virtual plane) that coincides with the opening direction of the opening 3B. The opening direction of the opening 3B is the direction parallel to both the virtual tangent line that is tangent to the outer circumference of the first guide roller 7 and the virtual tangent line that is tangent to the outer circumference of the second guide roller 9.

[0035] In this embodiment, the virtual line Lo is a virtual tangent line that is tangent to the outer circumference of the second guide roller 9, and is parallel to the virtual tangent line that is tangent to the outer circumference of the first guide roller 7. Specifically, the virtual line Lo is a horizontal line that is tangent to the outer circumference of the second guide roller 9.

[0036] Incidentally, the horizontal line that touches the outer circumference of the second guide roller 9 overlaps with the solid line indicated by belt 3. For this reason, in Figure 1, the virtual line Lo is drawn in a position where it does not overlap with the solid line indicated by belt 3, so that the difference between the virtual line Lo and belt 3 is clear.

[0037] In this embodiment, the shaft portion 9A of the second guide roller 9 (see Figure 2) is supported by the frame 19. The shaft portion 9A is immovable relative to the frame 19. The shaft portion 7A of the first guide roller 7 (see Figure 2) is supported by the swing arm 21.

[0038] The swing arm 21 is an arm-shaped frame that is swingably connected to the frame 19. The pivot center of the swing arm 21 is set to a position offset from the shaft portions 9A and 7A towards the intermediate roller 13A.

[0039] As shown in Figure 1, the first guide roller 7 and the second guide roller 9 are spaced apart from each other to form an opening 3B. The sheet material B1 is in contact with the belt 3 located on the side of the second guide roller 9, i.e., the lower belt 3.

[0040] <Route change mechanism> The path changing mechanism 13 is a mechanism that allows the movement path of the belt 3 to be changed and adjusted. The path changing mechanism 13 has at least an intermediate roller 13A and a roller support part 13B, etc. The intermediate roller 13A is an example of a contact part that contacts the belt 3.

[0041] In other words, the intermediate roller 13A contacts the belt 3 and rotates at a position shifted toward the annular portion 3A side (left side in Figure 1) relative to the first guide roller 7 and the second guide roller 9, thereby restricting the movement path of the belt 3.

[0042] The shaft portion (not shown) of the intermediate roller 13A is displaceable in a direction parallel to the imaginary line Lo. This shaft portion is displaceably supported by the frame 19. The roller support portion 13B works in cooperation with the frame 19 to displaceably support the intermediate roller 13A.

[0043] In this embodiment, the roller support portion 13B is made of, for example, a spring. The frame 19 is provided with an elongated hole (not shown) into which the shaft portion is inserted. The major axis direction of the elongated hole is parallel to the imaginary line Lo.

[0044] Therefore, the intermediate roller 13A is displaced to approach the annular portion 3A as the outer diameter of the annular portion 3A increases. As a result, the radius of curvature of the portion of the belt 3 that contacts the roll material B1, i.e., the annular portion 3A, expands in conjunction with the increase in the diameter of the roll material B1 as the winding of the sheet material B1 progresses and the diameter of the roll material B1 increases.

[0045] <Regulatory Department> The regulating section 15 functions to restrict the position of the annular section 3A so that it is located on one side of the imaginary line Lo (the upper side in Figure 1). The regulating section 15 in this embodiment is composed of a roller that rotates in contact with the outer circumferential surface of the annular section 3A. The roller is displaceable to follow changes in the outer diameter of the annular section 3A.

[0046] <feed roller> The feed roller 11 is a feeding mechanism that contacts the sheet material B1 and feeds the sheet material B1 toward the annular portion 3A. As shown in Figure 2, the feed roller 11 according to this embodiment is configured to have at least four rollers 11A to 11D.

[0047] Specifically, the feed roller 11 includes a first feed roller and a second feed roller, etc. The first feed roller is composed of two rollers 11A and 11B. These two rollers 11A and 11B are positioned on one side (the upper side in Figure 1) of the imaginary line Lo (sheet material B1 in Figure 1).

[0048] The second feed roller consists of two rollers 11C and 11D. These two rollers 11C and 11D are positioned on the other side (the lower side in Figure 1) of the imaginary line Lo (sheet material B1 in Figure 1).

[0049] Of the two rollers 11A and 11B that make up the first feed roller, one roller is positioned on one side in the width direction with respect to the annular portion 3A, that is, the belt 3, while the other roller is positioned on the other side in the width direction with respect to the belt 3.

[0050] Similarly, of the two rollers 11C and 11D that make up the second feed roller, one roller is positioned on one side of the belt 3, i.e., the annular portion 3A, and the other roller is positioned on the other side of the belt 3.

[0051] Furthermore, the system is configured such that the frictional force generated at the contact points between the first feed rollers 11A and 11B and the sheet material B1 is smaller than the frictional force generated at the contact points between the second feed rollers 11C and 11D and the sheet material B1.

[0052] Specifically, the first feed rollers 11A and 11B and the second feed rollers 11C and 11D are made of different materials, and the surface roughness of the outer surfaces of the first feed rollers 11A and 11B is lower than that of the second feed rollers 11C and 11D.

[0053] Incidentally, in this embodiment, the hardness of the outer surfaces of the second feed rollers 11C and 11D is less than the hardness of the outer surfaces of the first feed rollers 11A and 11B. Therefore, the outer surfaces of the second feed rollers 11C and 11D contact the sheet material B1 while elastically deforming to adhere closely to the sheet material B1.

[0054] The first feed rollers 11A and 11B are pressed towards the second feed rollers 11C and 11D via the swing arm 21. In this embodiment, the first feed rollers 11A and 11B are pressed towards the second feed rollers 11C and 11D by a gravity-based pressing device (not shown), such as a weight.

[0055] <Belt drive unit> The belt drive unit 5 is a drive source that rotates the belt 3. In this embodiment, as shown in Figure 2, the belt drive unit 5 rotates the belt 3 by rotating the second guide roller 9.

[0056] The belt drive unit 5 drives at least one of the first feed rollers 11A, 11B and the second feed rollers 11C, 11D (in this embodiment, the second feed rollers 11C, 11D) simultaneously with the second guide roller 9.

[0057] <Tension generating section> The tension generating unit 17, as shown in Figure 2, is a mechanism that generates tension in the sheet material B1 by pulling it in the width direction (left-right direction in the plane of the paper in Figure 2). Specifically, the tension generating unit 17 has at least two clamping parts 17A and two pulling parts 17B, etc.

[0058] Each clamping portion 17A is a pinch designed to grip and hold one end and the other end of the sheet material B1 in the width direction. Each tensioning portion 17B applies a force to the corresponding clamping portion 17A that separates the two clamping portions 17A from each other.

[0059] Each clamping section 17A is capable of rotating in conjunction with or in response to the rotation of the feed roller 11 or the roll material B2. As a result, the tension generating section 17 generates tension in the sheet material B1 in a direction parallel to the width direction, even when the roll material B2 is rotating.

[0060] <3. Features of the winding device according to this embodiment> In the winding device 1 according to this embodiment, the belt 3 contacts the outermost surface of the roll material B2, and the belt 3 rotates the roll material B2, thereby winding up the sheet material B1 to form the roll material B2. Therefore, in this winding device 1, it may be possible to reduce the diameter of the shaft or eliminate the shaft altogether.

[0061] In other words, in this embodiment, when the belt 3 is driven, the belt 3 constituting the annular portion 3A moves in a circular motion as it rotates. At this time, the leading edge of the sheet material B1 that has been fed into the annular portion 3A from the opening 3B comes into contact with the inner wall of the annular portion 3A, and so the leading edge moves in a circular motion together with the belt 3 constituting the annular portion 3A.

[0062] Therefore, the leading end of the sheet material B1 is curved in a rounded shape along the inner wall of the annular portion 3A (see Figure 1), forming the initial roll material B2, that is, the sheet material B1 that has been wound once. At this time, the belt 3 rotates in contact with the outermost surface of the initial roll material B2, so the sheet material B1 is wound up in a spiral pattern (see Figure 3).

[0063] Therefore, as the winding of the sheet material B1 progresses continuously, the outer diameter of the roll material B2 gradually increases. At this time, since the annular portion 3A is configured in a roughly C shape, the belt 3 is in contact with the outer surface of the roll material B2 so as to cover almost the entire outer surface of the roll material B2.

[0064] As a result, the winding device 1 can reliably rotate the roll material B2, making it possible to reliably wind up the sheet material B1. In other words, if slippage occurs at the contact point between the annular section 3A (belt 3) and the roll material B2, the sheet material B1 cannot be wound up efficiently.

[0065] In contrast, since the annular portion 3A is configured in a roughly C-shape, the belt 3 contacts the outer surface of the roll material B2 over almost the entire outer surface. Therefore, slippage is less likely to occur at the contact point between the belt 3 and the roll material B2, allowing the sheet material B1 to be wound up efficiently.

[0066] The winding device 1 is equipped with a path changing mechanism 13 that can change and adjust the movement path of the belt 3, and the intermediate roller 13A of the path changing mechanism 13 is displaced to move closer to the annular portion 3A as the outer diameter of the annular portion 3A increases.

[0067] This makes it possible to enlarge the inner diameter of the annular section 3A as the sheet material B1 is wound up. In other words, as the sheet material B1 is wound up, the outer diameter of the roll material B2 enlarges accordingly.

[0068] Therefore, in order to continuously wind the sheet material B1, it is necessary to enlarge the inner diameter of the annular section 3A in accordance with the enlargement of the outer diameter of the roll material B2. In contrast, the intermediate roller 13A can be displaced to approach the annular portion 3A in accordance with the expansion of the outer diameter of the annular portion 3A, that is, the outer diameter of the roll material B2. Therefore, it is possible to expand the inner diameter of the annular portion 3A as the sheet material B1 is wound up.

[0069] The winding device 1 has a restricting unit 15 that restricts the position of the annular portion 3A so that the annular portion 3A is located on one side of the virtual line Lo. This makes it possible to reliably wind the sheet material B1 into a round shape.

[0070] In other words, if the center of the annular portion 3A is located on the imaginary line Lo, then at the start of winding the sheet material B1, the leading edge of the sheet material B1 will abut against the inner wall of the annular portion 3A at a right angle.

[0071] In this state, the leading edge of the sheet material B1 is in an unstable state where it is unclear which direction it will curve. This is because it is in a state similar to when each link constituting the link mechanism is at a dead point (also called a "dead point").

[0072] In this case, if the leading edge of the sheet material B1 were to curve in the opposite direction to the intended direction, it may become impossible to properly wind up the sheet material B1 thereafter. However, in this embodiment, the annular portion 3A is configured to be located on one side of the virtual line Lo.

[0073] Therefore, the leading edge of the sheet material B1 curves stably toward the aforementioned one side, making it possible to reliably curve the sheet material B1 to conform to the inner wall of the annular portion 3A. Consequently, it becomes possible to reliably wind up the sheet material B1 into a round shape.

[0074] Incidentally, the winding device 1 can accommodate both cases when the leading end of the sheet material B1 is inserted into the annular section 3A: when the leading end of the sheet material B1 is folded in half before being inserted into the annular section 3A, and when the leading end is inserted into the annular section 3A without being folded in half.

[0075] The feed rollers 11 of the winding device 1 are provided on one side and the other side of the annular portion 3A in the width direction. This makes it possible to feed the sheet material B1 into the annular portion 3A without the sheet material B1 tilting with respect to the feeding direction.

[0076] In the winding device 1, the frictional force generated at the contact point between the first feed rollers 11A and 11B and the sheet material B1 is configured to be smaller than the frictional force generated at the contact point between the second feed rollers 11C and 11D and the sheet material B1.

[0077] As a result, even if the outer surface of the roll material B2 comes into contact with the first feed rollers 11A and 11B, the winding of the sheet material B1 is prevented from being hindered, and the sheet material B1 can be reliably fed out.

[0078] In other words, because the annular portion 3A is close to the first feed rollers 11A and 11B, if the outer diameter of the roll material B2 increases, the roll material B2 may come into contact with the first feed rollers 11A and 11B, potentially hindering the winding of the sheet material B1 and the feeding operation of the sheet material B1.

[0079] However, in the winding device 1, the frictional force generated at the contact point between the first feed rollers 11A and 11B and the sheet material B1 is configured to be smaller than the frictional force generated at the contact point between the second feed rollers 11C and 11D and the sheet material B1, so the occurrence of the above-mentioned obstruction can be suppressed.

[0080] The winding device 1 includes a tension generating unit 17 that pulls the sheet material B1 in the width direction to generate tension in the sheet material B1. As a result, even if the sheet material B1 has a large width dimension, the winding device 1 can reliably wind up the sheet material B1.

[0081] The belt 3 in the winding device 1 is a toothed belt with grooves on the side opposite to the surface that contacts the roll material B2. This helps to prevent the belt 3 from slipping against the belt drive unit 5.

[0082] (Other embodiments) In the above-described embodiment, the portion of the belt 3 that contacts the roll material B1 constituted an annular portion 3A that was substantially C-shaped. However, the present disclosure is not limited to this. That is, the portion of the belt 3 that contacts the roll material B1 may be, for example, an arc shape with a circumferential angle of about 5 to 30 degrees.

[0083] The belt 3 in the embodiment described above was a toothed belt. However, this disclosure is not limited thereto. That is, the disclosure may also describe a belt 3 made of, for example, a flat belt without any irregularities.

[0084] The path changing mechanism 13 according to the above embodiment was configured to have an intermediate roller 13A and a roller support portion 13B composed of a spring. However, the disclosure is not limited thereto. That is, the disclosure may, for example, have a roller support portion 13B composed of an electrically controlled actuator, and a contact portion composed of a member that slides in contact with the belt 3, such as a shoe.

[0085] In the embodiment described above, a route changing mechanism 13 was provided. However, this disclosure is not limited thereto. That is, the disclosure may also include a configuration in which the route changing mechanism 13 is omitted, for example, when the belt 3 is made of rubber and the belt 3 is elastically stretchable.

[0086] The regulating portion 15 in the above-described embodiment was composed of a roller. However, this disclosure is not limited thereto. That is, the disclosure may also describe a regulating portion 15 composed of a member that slides in contact with the belt 3, such as a shoe.

[0087] In the embodiment described above, a restricting section 15 was provided. However, this disclosure is not limited thereto. That is, in the disclosure, for example, if the direction of rotation of the belt 3 is opposite to the direction of rotation shown in Figure 1, gravity acts on the roll material B2 and the annular section 3A such that the annular section 3A is positioned below the imaginary line Lo, so the restricting section 15 may be eliminated.

[0088] In the above-described embodiment, the feed rollers 11 were provided on one side and the other side of the annular portion 3A. However, the disclosure is not limited thereto. That is, the disclosure may also include a configuration in which the feed rollers 11 are provided only on one side of the annular portion 3A.

[0089] In the above-described embodiment, the frictional force generated at the contact point between the first feed rollers 11A and 11B and the sheet material B1 was configured to be smaller than the frictional force generated at the contact point between the second feed rollers 11C and 11D and the sheet material B1. However, the present disclosure is not limited thereto.

[0090] In other words, the disclosure is such that, for example, if the annular portion 3A is set at a position sufficiently far from the feed roller 11, the frictional force generated at the first feed roller and the frictional force generated at the second feed roller may be the same.

[0091] The pressing device according to the above embodiment utilized gravity. However, this disclosure is not limited thereto. That is, the disclosure may also include a configuration in which a spring presses the first feed roller toward the second feed roller.

[0092] In the embodiments described above, an airbag was exemplified as the sheet material B1. However, the application of the invention disclosed herein is not limited to this. That is, the disclosure is applicable to other sheet materials B1, for example.

[0093] Furthermore, this disclosure is not limited to the embodiments described above, but is sufficient to be consistent with the intent of the disclosures described in the embodiments described above. Therefore, it may be a configuration in which at least two of the embodiments described above are combined, or a configuration in which any of the illustrated components or components described with reference numerals in the embodiments described above are omitted. [Explanation of Symbols]

[0094] 1… Winding device 3… Belt 3A… Ring section 3B…Aperture 5… Belt drive unit 7… First guide, Laura 9… Second guide, Laura 11… Feed roller 13… Route change mechanism 13A… Intermediate roller 13B… Roller support section 15… Regulatory Department 17… Tension generating section

Claims

1. In a winding device for winding a flexible sheet-like member, when the member is called a sheet material, and the sheet material wound so that it overlaps in the thickness direction is called a roll material, A belt that contacts the outermost surface of the roll material and rotates the roll material, The system includes a belt drive unit that rotates the aforementioned belt, A winding device configured such that the radius of curvature of the portion of the belt that contacts the roll material expands in conjunction with the expansion of the roll material's diameter.

2. The belt is equipped with a first guide roller and a second guide roller that guide the movement of the belt such that the portion of the belt that contacts the roll material forms a roughly C-shaped annular portion. The first guide roller and the second guide roller are positioned on the opening side of the annular portion with respect to the annular portion. Furthermore, the winding device according to claim 1, wherein the first guide roller is positioned on one side of a virtual line that coincides with the opening direction of the opening, and the second guide roller is positioned on the other side of the virtual line.

3. The device has a contact portion that contacts the belt, and is equipped with a path changing mechanism that can change and adjust the movement path of the belt. The winding device according to claim 2, wherein the contact portion is displaced to approach the annular portion as the outer diameter of the annular portion increases.

4. The winding device according to claim 3, further comprising a regulating part for regulating the position of the annular part such that the annular part is located on one side of the virtual line.

5. It is equipped with a feed roller that contacts the sheet material and feeds the sheet material to the annular portion, When the direction parallel to the central axis of the roll material is defined as the width direction, The winding device according to claim 4, wherein the feed rollers are provided on one side and the other side of the annular portion in the width direction.

6. The feed roller is configured to include a first feed roller positioned on one side of the imaginary line and a second feed roller positioned on the other side of the imaginary line. Furthermore, the winding device according to claim 5 is configured such that the frictional force generated at the contact point between the first feed roller and the sheet material is smaller than the frictional force generated at the contact point between the second feed roller and the sheet material.

7. The winding device according to claim 6, comprising a tension generating unit that grips one end and the other end of a sheet material in the width direction and pulls the sheet material in the width direction to generate tension in the sheet material.

8. The winding device according to claim 7, wherein the belt is a toothed belt with irregularities on the side opposite to the surface that contacts the roll material.

9. In a winding device that winds up the bag material that constitutes an airbag, if the bag material is called a sheet material, and the sheet material wound so that it overlaps in the thickness direction is called a roll material, A belt that contacts the outermost surface of the roll material and rotates the roll material, The system includes a belt drive unit that rotates the aforementioned belt, A winding device configured such that the radius of curvature of the portion of the belt that contacts the roll material expands in conjunction with the expansion of the roll material's diameter.

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