Clip chain

Abstract

To prevent resin sheets from being detached from a clip part, even if the resin sheets held in a thickness direction at the clip part are pulled strongly in a direction of being detached from the clip part.SOLUTION: A clip part 20 in a clip chain 1 comprises: a first holding member 21 having a first contact part 21c coming into contact with one surface in a thickness direction of a resin sheet; a second holding member 22 having a second contact part 22c coming into contact with the other surface in the thickness direction of the resin sheet; and an energization member 23 for energizing the first holding member 21 in a direction where the first contact part 21c approaches the second contact part 22c. The first contact part 21c is provided with a plurality of first protrusion parts 21e extending long in a longitudinal direction of the resin sheet, that are arranged to be mutually spaced apart at intervals in a width direction of the resin sheet. The second contact part 22c is provided with a plurality of second protrusion parts 22e extending long in the longitudinal direction of the resin sheet, that are arranged to be mutually spaced apart at intervals in the width direction of the resin sheet.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a clip chain used when transporting a resin sheet in a gripped state.

Background Art

[0002] For example, Patent Document 1 discloses a clip chain used when manufacturing a plastic film. The clip chain of Patent Document 1 includes a roller chain and a clip portion attached to the roller chain. The clip portion has a swing body swingably supported with respect to an arm attached to a link of the roller chain. When an end portion of a plastic film is inserted between a gripping claw provided at the tip end of the swing body and a receiving plate, the end portion of the plastic film is sandwiched between the gripping claw and the receiving plate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, for example, there is a molding apparatus that manufactures various products by heating a resin sheet and then molding it with a mold. In such a molding apparatus, it is necessary to transport the resin sheet from upstream to downstream. When transporting the resin sheet, it is conceivable to use a clip chain as disclosed in, for example, Patent Document 1 to sandwich both end portions in the width direction of the resin sheet.

[0005] However, when the mold presses the resin sheet in the thickness direction during molding, the resin sheet will be strongly pulled inward in the width direction, and there is a risk of detaching from between the gripping claw and the receiving plate of the clip chain.

[0006] The present disclosure is made in view of such a point, and an object thereof is to make it difficult for a resin sheet sandwiched in the thickness direction by a clip portion to be detached from the clip portion even when strongly pulled in a direction away from the clip portion.

Means for Solving the Problems

[0007] In order to achieve the above object, in one aspect of the present disclosure, a roller chain that circulates along a predetermined circulation path and a clip portion that is attached to the roller chain and sandwiches a resin sheet are provided. A clip chain for conveying the resin sheet sandwiched by the clip portion in the longitudinal direction of the resin sheet by the circulating operation of the roller chain can be premised.

[0008] The clip portion includes a first sandwiching member having a first contact portion that contacts one surface in the thickness direction of the resin sheet, a second sandwiching member having a second contact portion that contacts the other surface in the thickness direction of the resin sheet, and a biasing member that biases the first sandwiching member in a direction in which the first contact portion approaches the second contact portion. A plurality of first ridge portions that extend long in the longitudinal direction of the resin sheet are provided at intervals in the width direction of the resin sheet on the first contact portion. A plurality of second ridge portions that extend long in the longitudinal direction of the resin sheet are provided at intervals in the width direction of the resin sheet on the second contact portion.

[0009] According to this configuration, when the resin sheet is disposed between the first contact portion of the first sandwiching member and the second contact portion of the second sandwiching member, the resin sheet is sandwiched in the thickness direction by the first contact portion and the second contact portion due to the biasing force of the biasing member. At this time, since a plurality of first ridge portions that extend long in the conveying direction, which is the longitudinal direction of the resin sheet, are formed on the first contact portion, the plurality of first ridge portions bite into one surface in the thickness direction of the resin sheet. Further, since a plurality of second ridge portions that extend long in the conveying direction, which is the longitudinal direction of the resin sheet, are formed on the second contact portion, the plurality of second ridge portions bite into the other surface in the thickness direction of the resin sheet.

[0010] Further, the first protruding strip portion and the second protruding strip portion may be alternately arranged in the width direction of the resin sheet. Thereby, the first protruding strip portion and the second protruding strip portion are each likely to bite into the resin sheet. Therefore, even if the resin sheet is strongly pulled inward in the width direction, it is difficult to come out from between the first contact portion and the second contact portion.

[0011] Further, the first clamping member may have a mounting portion attached to the roller chain and an extending portion extending from the mounting portion. In this case, the first contact portion is provided at the tip of the extending portion and can be formed wider than the extending portion. Thereby, since the length of the first protruding strip portion can be increased, it becomes even more difficult for the resin sheet to come out from between the first contact portion and the second contact portion.

[0012] Further, the second clamping member may be attached to a pin of the roller chain, and the first clamping member may be supported by the second clamping member. According to this configuration, since the mounting portion of the clip portion with respect to the roller chain can be in one place, the structure becomes simple.

[0013] Further, the first contact portion may be formed so as to be farther away from one surface in the thickness direction of the resin sheet as it approaches the edge of the first contact portion. According to this configuration, when the resin sheet is inserted between the first contact portion and the second contact portion, the edge of the resin sheet is less likely to interfere with the edge of the first contact portion, so the resin sheet is easily inserted between the first contact portion and the second contact portion.

Advantages of the Invention

[0014] As described above, a plurality of first protruding strip portions and second protruding strip portions that extend long in the longitudinal direction of the resin sheet are provided in a state where the resin sheet is clamped, and the plurality of first protruding strip portions and second protruding strip portions are made to bite into the resin sheet. Therefore, even if the resin sheet clamped in the thickness direction by the clip portion is strongly pulled in the direction of separating from the clip portion, it is difficult to separate from the clip portion.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its applications, or its uses.

[0017] FIG. 1 is a plan view of a clip chain 1 according to an embodiment of the present invention. This clip chain 1 is a member used when transporting a resin sheet S while sandwiching an end portion in the width direction of the resin sheet S in the thickness direction. In this embodiment, a case where the clip chain 1 is incorporated in a molding apparatus (not shown) will be described. The molding apparatus is configured to be able to be molded by a mold after heating while transporting the resin sheet S. Therefore, a heater for heating the resin sheet S is provided on the upstream side in the transport direction, and a mold composed of an upper mold and a lower mold is provided on the downstream side of the heater. The resin sheet S is fed out from a supply roller (not shown) disposed upstream of the heater of the molding apparatus, for example. When the resin sheet S fed out from the supply roller is molded by the mold, the molded portion becomes a product and is accumulated downstream of the mold. The portion that has become a product is separated from the resin sheet S by a blade provided in the molding apparatus. The resin sheet S remaining after the product is separated is wound around a take-up roller (not shown) disposed downstream of the molding apparatus.

[0018] The resin sheet S is not particularly limited, and examples thereof include polypropylene (PP), polyethylene terephthalate (PET), and polystyrene (PS). Further, the thickness of the resin sheet S is not particularly limited, but can be, for example, in the range of 0.1 mm or more and 3.0 mm or less.

[0019] In the embodiment, a case where the resin sheet S is transported in the horizontal direction will be described. The direction along the transport direction of the resin sheet S is referred to as the longitudinal direction of the resin sheet S. Further, the direction orthogonal to the longitudinal direction of the resin sheet S in a plan view is defined as the width direction of the resin sheet S. Note that the resin sheet S may be transported in the vertical direction, and its transport direction is not particularly limited.

[0020] The clip chain 1 is respectively provided so as to be located on both sides in the width direction of the resin sheet S. In FIG. 1, the clip chain 1 provided on one side in the width direction of the resin sheet S will be described, but a similar clip chain 1 is also provided on the other side in the width direction of the resin sheet S. The clip chains 1 on both sides are adapted to circulate synchronously.

[0021] The clip chain 1 includes a roller chain 10 and clip portions 20 attached to the roller chain 10. The clip portions 20 are portions for sandwiching the resin sheet S, and a plurality of clip portions 20 are provided at intervals in the longitudinal direction of the roller chain 10. The number and pitch of the clip portions 20 are not particularly limited and may be determined according to the thickness and material of the resin sheet S, etc.

[0022] As also shown in FIGS. 2 to 5, the roller chain 10 includes a plurality of pins 11 extending in the vertical direction, a plurality of upper rollers 12 rotatably supported with respect to the upper portions of the respective pins 11, a plurality of lower rollers 13 rotatably supported with respect to the lower portions of the respective pins 11, and links 14a, 14b, 14c connecting adjacent pins 11 to each other. By connecting adjacent pins 11 to each other with the links 14a, 14b, 14c, the roller chain 10 becomes an endless member (ring-shaped member) without ends.

[0023] The link 14a is a member that rotatably connects the upper end portions of adjacent pins 11 and is an upper link. The link 14b is a member that rotatably connects the intermediate portions in the vertical direction of adjacent pins 11 and is an intermediate link. The link 14c is a member that rotatably connects the lower end portions of adjacent pins 11 and is a lower link.

[0024] The upper roller 12 is disposed between the upper link 14a and the intermediate link 14b. Also, the lower roller 13 is disposed between the intermediate link 14b and the lower link 14c. Thereby, the vertical interval between the upper roller 12 and the lower roller 13 is determined.

[0025] As shown in Fig. 1, the drive device 30 for driving the roller chain 10 includes a first sprocket 31, a second sprocket 32, a first rotating shaft 33, a second rotating shaft 34, and a drive motor (not shown). The first rotating shaft 33 and the second rotating shaft 34 extend in the vertical direction and are arranged at intervals in the conveyance direction of the resin sheet S. As shown in Fig. 3, the first sprocket 31 is fixed to the first rotating shaft 33. On the first sprocket 31, an upper tooth 31a engaging with the upper roller 12 is formed at a height corresponding to the upper roller 12, and a lower tooth 31b engaging with the lower roller 13 is formed at a height corresponding to the lower roller 13. The second sprocket 32 is fixed to the second rotating shaft 34. On the second sprocket 32, an upper tooth 32a engaging with the upper roller 12 is formed at a height corresponding to the upper roller 12, and a lower tooth 32b engaging with the lower roller 13 is formed at a height corresponding to the lower roller 13.

[0026] The drive motor rotates one of the first rotating shaft 33 and the second rotating shaft 34. In this embodiment, as shown in Fig. 1, since the conveyance direction of the resin sheet S is the left direction, the rotation direction of the drive motor is set so that the first rotating shaft 33 rotates counterclockwise in a plan view as indicated by the arrow A. One of the first sprocket 31 and the second sprocket 32 is a drive sprocket that applies a driving force to the roller chain 10, and the other is a driven sprocket. When the drive motor is rotated, the roller chain 10 circulates along a predetermined circulation track determined by the first sprocket 31 and the second sprocket 32. When the resin sheet S is held by the clip portion 20 when the roller chain 10 circulates, the resin sheet S can be conveyed in the longitudinal direction of the resin sheet S by the circulating operation of the roller chain 10. Hereinafter, the detailed structure of the clip portion 20 capable of holding the resin sheet S with a strong force will be described.

[0027] As also shown in FIG. 5, the clip portion 20 includes a first clamping member 21, a second clamping member 22, a biasing member 23, and a support shaft 24. The first clamping member 21, which is shown enlarged in FIG. 6, contacts the upper surface (one surface in the thickness direction) of the resin sheet S, and the second clamping member 22, which is shown enlarged in FIG. 7, contacts the lower surface (the other surface in the thickness direction) of the resin sheet S. In this state, by biasing the first clamping member 21 downward by the biasing member 23, the resin sheet S can be clamped in the thickness direction by the first clamping member 21 and the second clamping member 22.

[0028] That is, the second clamping member 22 has a mounting portion 22a attached to the pin 11 of the roller chain 10, an extending portion 22b extending from the mounting portion 22a, and a second contact portion 22c contacting the lower surface of the resin sheet S. The mounting portion 22a, the extending portion 22b, and the second contact portion 22c are formed of a single high-strength metal plate material. The mounting portion 22a has a shape that is long in the conveying direction. Two pin insertion holes 22d (also shown in FIG. 7) through which the intermediate portions in the vertical direction of two adjacent pins 11 of the roller chain 10 are respectively inserted are formed in the mounting portion 22a. Therefore, the mounting portion 22a also has a function of connecting the intermediate portions in the vertical direction of two adjacent pins 11. Further, the mounting portion 22a is positioned in the height direction by being sandwiched vertically by two intermediate links 14b.

[0029] A second contact portion 22c is provided at the tip of the extending portion 22b (the tip in the extending direction) so as to extend in the same direction. The width (dimension in the conveying direction) of the second contact portion 22c is set wider than the width (dimension in the same direction) of the extending portion 22b. Therefore, the second contact portion 22c has a wider shape than the extending portion 22b.

[0030] A plurality of second protrusion portions 22e extending long in the longitudinal direction of the resin sheet S are provided on the upper surface of the second contact portion 22c at intervals in the width direction of the resin sheet S. The length of the second protrusion portion 22e is set longer than the dimension in the width direction of the extending portion 22b, whereby it becomes possible to bring a wide range of the second contact portion 22c into contact with the lower surface of the resin sheet S.

[0031] The first clamping member 21 is supported by the second clamping member 22 via the support shaft 24. That is, the first clamping member 21 has a base portion 21a, an extension portion 21b extending from the base portion 21a, and a first contact portion 21c that contacts the upper surface of the resin sheet S. The base portion 21a, the extension portion 21b, and the first contact portion 21c are formed of a single high-strength metal plate material. The base portion 21a has a shape that is long in the conveyance direction. An insertion hole 21d through which the upper portion of the support shaft 24 is inserted is formed at the longitudinal center portion of the base portion 21a. The upper portion of the support shaft 24 is fixed to the base portion 21a in a state of being inserted through the insertion hole 21d.

[0032] At the tip of the extension portion 21b (the tip in the extension direction), the first contact portion 21c is provided so as to extend in the same direction. The width (dimension in the conveyance direction) of the first contact portion 21c is set wider than the width (dimension in the same direction) of the extension portion 21b. Therefore, the first contact portion 21c has a wider shape than the extension portion 21b.

[0033] As shown in FIG. 8, the lower surface of the first contact portion 21c and the upper surface of the second contact portion 22c are arranged to face each other. A plurality of first protrusion portions 21e that extend long in the longitudinal direction of the resin sheet S are provided on the lower surface of the first contact portion 21c at intervals in the width direction of the resin sheet S. The length of the first protrusion portion 21e is set longer than the dimension in the width direction of the extension portion 21b, whereby it becomes possible to bring a wide range of the first contact portion 21c into contact with the upper surface of the resin sheet S.

[0034] The lower surface of the first contact portion 21c and the upper surface of the second contact portion 22c are plated. The plating is, for example, nickel plating or the like. Further, the first contact portion 21c and the second contact portion 22c are plated on the entire surface after shot blasting. Note that plating may be applied only to the lower surface of the first contact portion 21c and the upper surface of the second contact portion 22c. By increasing the friction coefficient of the surface after shot blasting, the gripping force is improved regardless of the temperature state of the sheet S.

[0035] The first rib portion 21e and the second rib portion 22e are alternately arranged in the width direction of the resin sheet S when viewed along the thickness direction of the resin sheet S. Specifically, in a plan view, the second rib portion 22e is arranged between the first rib portions 21e adjacent to each other in the width direction of the resin sheet S, and the first rib portion 21e is arranged between the second rib portions 22e adjacent to each other in the width direction of the resin sheet S, so that the positional relationship between the first rib portion 21e and the second rib portion 22e is set. In other words, the second rib portion 22e is arranged directly below the groove (concave rib portion) formed between the first rib portions 21e adjacent to each other in the width direction of the resin sheet S, and the first rib portion 21e is arranged directly above the groove (concave rib portion) formed between the second rib portions 22e adjacent to each other in the width direction of the resin sheet S, so that the positional relationship between the first rib portion 21e and the second rib portion 22e is set.

[0036] As shown in FIG. 8, the first contact portion 21c is formed so as to be farther away from the upper surface of the resin sheet S as it approaches the edge in the width direction of the first contact portion 21c. Specifically, an inclined surface 21f is formed in the vicinity of the edge in the width direction on the lower surface of the first contact portion 21c. This inclined surface 21f is inclined so as to be positioned higher as it approaches the edge in the width direction of the first contact portion 21c. Thereby, when the resin sheet S is inserted between the first contact portion 21c and the second contact portion 22c, the edge of the resin sheet S is less likely to interfere with the edge of the first contact portion 21c, so that the resin sheet S can easily enter between the first contact portion 21c and the second contact portion 22c.

[0037] Similarly, the second contact portion 22c is also formed so as to be farther away from the lower surface of the resin sheet S as it approaches the edge in the width direction of the second contact portion 22c. Specifically, an inclined surface 22f is formed in the vicinity of the edge in the width direction on the upper surface of the second contact portion 22c. This inclined surface 22f is inclined so as to be positioned lower as it approaches the edge in the width direction of the second contact portion 22c.

[0038] As shown in FIG. 2, a pair of side plate portions 25 are provided on the first clamping member 21. The side plate portions 25 extend downward from both sides in the width direction of the base portion 21a. A support shaft 24 is positioned between the pair of side plate portions 25. Further, the extending portion 22b of the second clamping member 22 is disposed between the pair of side plate portions 25. Thereby, it becomes difficult for the first clamping member 21 and the second clamping member 22 to be displaced relative to each other in the width direction.

[0039] As shown in FIG. 5, the lower portion of the support shaft 24 is supported by a support plate 26 with respect to the roller chain 10. The support plate 26 is a member constituting a part of the clip portion 20 and is attached to the pin 11 of the roller chain 10. Specifically, the support plate 26 has a substrate portion 26a and an extending plate portion 26b extending from the substrate portion 26a. The substrate portion 26a has a shape that is long in the conveying direction. Two pin insertion holes 26c through which the lower portions of two adjacent pins 11 of the roller chain 10 are respectively inserted are formed in the substrate portion 26a. Therefore, the substrate portion 26a also has a function of connecting the intermediate portions in the vertical direction of two adjacent pins 11.

[0040] A guide hole 26d through which the lower portion of the support shaft 24 is inserted is formed in the extending plate portion 26b of the support plate 26 so as to penetrate in the vertical direction. The lower portion of the support shaft 24 is guided in the vertical direction by inserting through the guide hole 26d. The lower end portion of the support shaft 24 protrudes downward from the lower surface of the extending plate portion 26b.

[0041] The biasing member 23 is constituted by, for example, a coil spring. The intermediate portion in the vertical direction of the support shaft 24 is inserted through the biasing member 23, whereby the axis of the biasing member 23 and the axis of the support shaft 24 are substantially aligned. The upper end portion of the biasing member 23 abuts against the lower surface of the extending portion 22b of the second clamping member 22. On the other hand, a receiving portion 27 against which the lower end portion of the biasing member 23 abuts is fixed to the portion of the support shaft 24 between the extending portion 22b and the extending plate portion 26b. The receiving portion 27 is a portion for receiving the lower end portion of the biasing member 23.

[0042] The biasing member 23 is set to have an axial length such that it contracts by a predetermined amount or more between the extending portion 22b of the second clamping member 22 and the receiving portion 27 fixed to the support shaft 24. Therefore, the biasing member 23 generates an extending force between the extending portion 22b of the second clamping member 22 and the receiving portion 27 fixed to the support shaft 24. Then, the first contact portion 21c of the first clamping member 21 fixed to the support shaft 24 tries to move downward, and thereby, the biasing member 23 biases the first clamping member 21 in a direction in which the first contact portion 21c approaches the second contact portion 22c.

[0043] As shown in FIGS. 1 and 3, the drive device 30 of the present embodiment includes an upstream control member 40 and a downstream control member 50. The upstream control member 40 is formed in a disc shape, and a bearing member 42 is fitted into its central hole 41. The first rotating shaft 33 is inserted through the bearing member 42, and the upstream control member 40 can be maintained in a fixed state even when the first rotating shaft 33 rotates. The downstream control member 50 is also formed in a disc shape, and a bearing member 52 is fitted into its central hole 51. The second rotating shaft 34 is inserted through the bearing member 52, and the downstream control member 50 can be maintained in a fixed state even when the second rotating shaft 34 rotates.

[0044] An upstream control surface 43 and a downstream control surface 53 are respectively formed on the upper surface of the upstream control member 40 and the upper surface of the downstream control member 50. The upstream control surface 43 is continuously formed in the circumferential direction on the upper surface of the upstream control member 40, and the height varies depending on the position. Similarly, the downstream control surface 53 is continuously formed in the circumferential direction on the upper surface of the downstream control member 50, and the height varies depending on the position.

[0045] On the upstream control surface 43 and the downstream control surface 53, the lower end of the moving support shaft 24 is in sliding contact. In the region indicated by reference sign B in FIG. 1, the height of the upstream control surface 43 and the height of the downstream control surface 53 are set relatively low so that the support shaft 24 moves downward by the biasing force of the biasing member 23. Therefore, the clip portion 20 moving in the region indicated by reference sign B closes as shown by the solid line in FIG. 5. At this time, when the resin sheet S is disposed between the first contact portion 21c and the second contact portion 22c, the resin sheet S is sandwiched in the thickness direction by the first contact portion 21c and the second contact portion 22c. Thereby, in the region indicated by reference sign B, the resin sheet S can be held at a predetermined position during heating or molding.

[0046] On the other hand, in regions other than the region indicated by reference sign B, the height of the upstream control surface 43 and the height of the downstream control surface 53 are set relatively high so that the support shaft 24 moves upward against the biasing force of the biasing member 23. As a result, in regions other than the region indicated by reference sign B, the clip portion 20 is in a state of separating from the resin sheet S, so that the circulating drive of the roller chain 10 is not inhibited.

[0047] (Operation and Effect of Embodiment) As described above, according to the present embodiment, when the resin sheet S is disposed between the first contact portion 21c of the first sandwiching member 21 and the second contact portion 22c of the second sandwiching member 22, the resin sheet S is sandwiched in the thickness direction by the first contact portion 21c and the second contact portion 22c by the biasing force of the biasing member 23. At this time, since a plurality of first protrusion portions 21e that extend long in the conveyance direction, which is the longitudinal direction of the resin sheet S, are formed on the first contact portion 21c, the plurality of first protrusion portions 21e bite into the upper surface of the resin sheet S. Further, since a plurality of second protrusion portions 22e that extend long in the conveyance direction, which is the longitudinal direction of the resin sheet S, are formed on the second contact portion 22c, the plurality of second protrusion portions 22e bite into the lower surface of the resin sheet S.

[0048] And since the first protruding strip portions 21e and the second protruding strip portions 22e are alternately arranged in the width direction of the resin sheet S, the first protruding strip portions 21e and the second protruding strip portions 22e are more likely to bite into the resin sheet S respectively. Therefore, even if the resin sheet S is strongly pulled inward in the width direction, it is difficult to slip out between the first contact portion 21c and the second contact portion 22c.

[0049] The above-described embodiments are merely illustrative in all respects and should not be construed in a limiting sense. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

Industrial Applicability

[0050] As described above, the clip chain according to the present disclosure can be used, for example, when thermoforming while conveying a resin sheet.

Explanation of Signs

[0051] 1 Clip chain 10 Roller chain 11 Pin 20 Clip portion 21 First clamping member 21c First contact portion 21e First protruding strip portion 22 Second clamping member 22a Mounting portion 22b Extension portion 22c Second contact portion 22e Second protruding strip portion 23 Biasing member S Resin sheet

Claims

1. A clip chain including a roller chain that circulates along a predetermined circulation path and a clip portion attached to the roller chain for sandwiching a resin sheet, the clip chain being configured to convey the resin sheet sandwiched by the clip portion in the longitudinal direction of the resin sheet by the circulating operation of the roller chain, wherein the clip portion includes a first sandwiching member having a first contact portion that contacts one surface of the resin sheet in the thickness direction, a second sandwiching member having a second contact portion that contacts the other surface of the resin sheet in the thickness direction, and a biasing member that biases the first sandwiching member in a direction in which the first contact portion approaches the second contact portion, wherein a plurality of first protrusion portions extending in the longitudinal direction of the resin sheet are provided at intervals from each other in the width direction of the resin sheet on the first contact portion, and a plurality of second protrusion portions extending in the longitudinal direction of the resin sheet are provided at intervals from each other in the width direction of the resin sheet on the second contact portion.

2. The clip chain according to claim 1, wherein the first protrusion portions and the second protrusion portions are alternately arranged in the width direction of the resin sheet when viewed along the thickness direction of the resin sheet.

3. The clip chain according to claim 2, wherein the second sandwiching member has a mounting portion attached to the roller chain and an extending portion extending from the mounting portion, and the second contact portion is provided at a tip end portion of the extending portion and is formed wider than the extending portion.

4. The clip chain according to claim 3, wherein the second sandwiching member is attached to a pin of the roller chain, and the first sandwiching member is supported by the second sandwiching member.

5. The clip chain according to claim 3, wherein the first contact portion is formed such that it is farther away from one surface of the resin sheet in the thickness direction as it approaches the edge of the first contact portion.

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