JP2013193853A - Film carrying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film carrying device for preventing generation of metallic powder by abrasion of a chain and a guide member, by reducing tensile force acting on the chain.SOLUTION: A film carrying device 10 has guide members 20 arranged along both sides of a carrying passage of a film 1 and constituted of a pair of guide rails 21 and 21, chains 30 for moving along the guide members 20, and holding plates 50 installed in the chains 30 and holding both end parts of the film 1. The holding plate 50 is installed via an arm 60 extended toward the inside the carrying passage from an outside plate 31 of the chain 30, and the arm 60 has a bending part 65 bent so as to return again in the support surface direction after being extended in any direction for crossing with a support surface F of the film 1 from the outside plate 31, and the holding plate 50 is connected to a tip part 70 of the bending part 65.

Description

  The present invention relates to a film transport apparatus that transports while holding both ends of a film transported in a band shape.

  Conventionally, when a film is conveyed, it is conveyed while holding both ends thereof. Among the films, the polyimide film used as an electric insulating film, a heat insulating film, a base film of a flexible circuit board, etc. is, for example, a self-supporting film obtained by casting a solvent solution of a polyimide precursor on a support. (Hereinafter, simply referred to as “polyimide self-supporting film”) is produced by heat treatment under predetermined conditions. At this time, since the self-supporting film shrinks by heating, the heat treatment is performed while holding both ends of the film with a tenter device.

  As a conventional tenter device of this type, the following Patent Document 1 discloses a pair of tenter rails arranged on both sides of a web conveyance path, a pair of tenter chains moving along a pair of tenter rails, and each tenter chain. What has the fixing member for web fixing provided is described. In the tenter chain, an upper roller and a lower roller are rotatably provided, and these are arranged between the inner support wall and the outer support wall of each tenter rail. An L-shaped first upper plate is connected above the tenter chain, and the fixing member is attached to the tip thereof.

  Then, the tensile force due to the contraction of the web acts on the tenter chain via the fixing member and the first upper plate and tilts obliquely, the upper roller rotates while contacting the inner support wall of the tenter rail, and the lower roller The tenter chain moves along the tenter rail by rotating while contacting the outer support wall.

  However, in the tenter device of Patent Document 1, since the tenter chain is inclined obliquely and the predetermined positions of the upper roller and the lower roller are in contact with the support walls of the tenter rail, The support wall was easily worn and metal powder was easily generated. And there existed a possibility that metal powder might adhere to a film surface and it might become inferior goods, or the operation | movement of a tenter chain might be hindered.

  As a means for solving the above problems, the following Patent Document 2 includes a pair of guide plates, a pair of tenter rails arranged on both sides of the polyimide film conveyance path, and a movement along the tenter rails. A tenter device having a pair of tenter chains provided with a film holding mechanism for gripping the edge of the film is described. A shaft member having bearings at both ends is attached to the top of each tenter chain, and the bearings at both ends of the shaft member are rotatably supported on the upper surfaces of a pair of guide plates of each tenter rail. Yes. Also, an L-shaped attachment plate is fixed to the outer plate above the outer link constituting the tenter chain, and a pin plate having a plurality of piercing pins is attached to the tip of the attachment plate. The polyimide film is held by the plate.

  In the tenter device of Patent Document 2, since the bearings at both ends of the shaft member attached to the tenter chain are supported on the upper surfaces of the pair of guide plates of the tenter rail, the tensile force due to the shrinkage of the polyimide film during the heat treatment is Even if the tenter chain acts on the tenter chain via the plate and the attach plate, the tenter chain is difficult to tilt obliquely, and the roller is prevented from contacting the inner surface of the guide plate with a large pressure.

JP 2001-146344 A International Publication No. 2011/043438 Pamphlet

  However, in the case of a structure that holds a film with an L-shaped attachment plate fixed to a tenter chain and a pin plate attached to the tip thereof, as in the tenter device of Patent Document 2, for example, the film is heat-treated. When some tension is generated, such as film shrinkage, the tensile force acts almost directly on the tenter chain, increasing the frictional force between the tenter chain roller and the inner surface of the guide plate of the tenter rail. There is a risk of increasing the generation of powder.

  Accordingly, an object of the present invention is to provide a film transport apparatus that can reduce the tensile force acting on the chain due to film shrinkage or the like and prevent the occurrence of metal powder or the like due to wear of the chain or guide member. .

  In order to achieve the above object, the present invention is a film transporting device that is transported in the form of a strip, and is arranged along both sides of the transporting path of the film, and a guide member comprising a pair of guide rails, A chain that is sandwiched between the guide rails and moves along the guide member, and a holding plate that is attached to the chain and holds both ends of the film, and the holding plate is an outer side that constitutes the chain. It is attached via an arm that extends from the plate toward the inside of the conveyance path, and the arm extends from the outer plate in any direction intersecting the support surface of the film. After that, it has a bent portion bent so as to return to the support surface again, and the holding plate is connected to the tip of the bent portion.

  According to the present invention, when a film is transported, tension is applied to the chain via the holding plate and the arm in a direction perpendicular to the traveling direction of the chain, and the chain is bent by the bending portion of the arm. This pulling force is reduced and the frictional force and unbalanced load generated between the chain and the guide member and between each member of the chain are reduced. Can be prevented. Therefore, it can prevent that metal powder etc. adhere to a film and a product defect arises, and can improve the durability of a chain.

  In the film transport apparatus according to the present invention, the film is a polyimide self-supporting film, and the film transport apparatus retains both ends when the film is heat-treated, and contracts with heating. It is preferable that it is a tenter device for suppressing the above. According to this aspect, even if a polyimide self-supporting film that easily shrinks during heat treatment is used as the film, the tensile force applied to the tenter chain can be effectively reduced.

  In the film transport device of the present invention, the support surface of the film is disposed substantially parallel to the floor surface on which the film transport device is placed, and the arm faces downward with respect to the support surface. It is preferable to have a bent portion that is bent so as to return upward again after being extended. According to this aspect, since the bent portion of the arm is formed so as to protrude downward, the center of gravity of the arm is disposed downward, and the running stability of the chain moving along the guide member is improved. Can do.

  In the film transport device of the present invention, the chain is inserted into the bush by a pair of outer plates, a pair of inner plates, a bush disposed through the ends of the inner plate, and the bush. The outer plate and the pin connecting the end portions of the inner plate, the roller mounted on the outer periphery of the bush, and the one outer plate to which the arm is connected are supported perpendicular to the longitudinal direction of the outer plate. Each of the guide members arranged along both sides of the conveyance path of the film, except for at least the outer plate to which the arm is connected. A pair of guide rails erected in parallel so that the upper rolling bearing is above the guide rail of the guide member. In contact with and movably supporting the chain, the film supporting surface of the holding plate, is preferably located above the contact surface between the guide member and the upper roller bearing.

  According to this aspect, the upward rolling bearing can reduce the frictional force between the chain and the guide member to reduce the generation of metal powder or the like due to wear, and the film support surface of the holding plate can be used for the upward rolling bearing and the guide member. Even if the distance between the holding plate and the outer plate is close, the tensile force applied to the chain is reduced by the bent part of the arm, and the metal caused by wear. Generation | occurrence | production of powder etc. can be reduced more effectively.

  In the film conveying apparatus of the present invention, the roller and a downward rolling bearing having an outer diameter larger than that of the roller are disposed on the outer periphery of the bush, and the downward rolling bearing is located above the roller. The lower rolling bearing is in contact with the inner surface of the guide rail located on the film transport path side when the chain is pulled by the contraction force of the film. Preferably it is.

  According to this aspect, when the chain is pulled by the contraction force of the film, the downward rolling bearing comes into contact with the inner surface of the guide rail located on the film conveyance path side, so that the axis of the chain pin is in contact with the guide rail. In contrast, the downward rolling bearing can reduce the frictional force between the chain and the guide member more effectively.

  In the film transport apparatus of the present invention, the bent portion of the arm is preferably bent into a U shape, a V shape, or a U shape. According to this aspect, since the bent portion of the arm is bent in a U shape, a V shape, or a U shape, the tensile force applied to the chain can be effectively reduced by the bending of the bent portion of the arm. .

  In the film transport apparatus of the present invention, the bent portion of the arm has a portion extending substantially perpendicular to the support surface of the film at the tip, and the holding plate is provided at the tip of the arm. It is preferable that it is attached to the position changeable. According to this aspect, even if the height to be supported by the holding plate is changed by the specifications of a heat treatment furnace or the like installed in the factory, an appropriate height can be adjusted by adjusting the mounting position of the holding plate to the arm. Therefore, the versatility of the chain can be improved.

  According to the present invention, even if a tension is applied to the chain during film conveyance due to film shrinkage, the tensile force applied to the chain can be reduced by the bending of the bent portion of the arm. Generation | occurrence | production of metal powder etc. can be prevented, metal powder etc. can adhere to a film, it can prevent that a product defect arises, and durability of a chain can be improved.

1 is a plan view showing an embodiment of a film transport apparatus according to the present invention. It is a principal part enlarged plan view of the conveyance apparatus of the film. It is a principal part expanded sectional view of the conveyance apparatus of the film. It is explanatory drawing which shows the other shape of the bending part of an arm in the conveyance apparatus of the film. The other embodiment of the conveyance apparatus of the film which concerns on this invention is shown, (a) The principal part expanded sectional view, (b) is explanatory drawing at the time of seeing from the E arrow line of (a).

  Hereinafter, with reference to FIGS. 1-4, one Embodiment of the conveying apparatus of the film which concerns on this invention is described.

  As shown in FIG. 1, a film transport apparatus 10 (hereinafter referred to as “transport apparatus 10”) in this embodiment includes both sides of a transport path of a film 1 that is drawn out from a roller (not shown) and transported in a belt shape. And a guide member 20 disposed along the guide member 20 and endless chains 30 and 30 that move along the guide member 20. A driving sprocket 25 that is rotatable by driving means (not shown) meshes with one end of each chain 30, and a driven sprocket 27 meshes with the other end, and the driving sprocket is driven by driving means (not shown). When 25 rotates, each chain 30 moves in the direction shown by the arrow in FIG.

  In the transport device 10 of this embodiment, a pair of guide members 20, 20 are arranged in parallel on both sides of the film 1, and a total of four guide members 20 are provided. Each guide member 20 includes a pair of guide rails 21 and 21 that extend in a rail shape and are arranged in parallel with each other at a predetermined interval. A chain 30 is sandwiched between the guide rails 21 and 21, and the movement thereof is guided. It has come to be.

  2 and 3, the endless chain 30 has a structure in which a pair of outer plates 31 and 32 parallel to each other and a pair of inner plates 33 and 34 parallel to each other are alternately connected. ing. The upper and lower ends of the bush 35 are press-fitted into both ends of the inner plates 33 and 34, respectively, so that the inner plates 33 and 34 are integrated. Further, the end portions of the outer plates 31 and 32 are arranged outside the end portions of the inner plates 33 and 34, and these end portions are connected to each other via the pins 36 inserted into the outer plates 31 and 32 and the bush 35. They are connected so as to be rotatable with respect to each other. One end of the pin 36 engages with the outer plate 32, and the other end is fastened and fixed by a nut 38 via a washer 37, and both plates are held out.

  A roller 40 is rotatably disposed on the outer periphery of the bush 35, and a downward rolling bearing 41 having an outer diameter larger than the roller 40 is rotatably disposed above the roller 40. The downward rolling bearing 41 of this embodiment is a ball bearing comprising an inner ring 41a, an outer ring 41b arranged on the outer periphery thereof, and a plurality of balls 41c arranged so as to be able to roll between them. It is not limited.

  As shown in FIGS. 2 and 3, arm fixing portions 31 a and 31 a are extended from both longitudinal ends of the upper outer plate 31 toward the conveyance path of the film 1. A support shaft 43 is fixed to the intermediate portion of the outer plate 31 so as to be orthogonal to the longitudinal direction, and upward rolling bearings 45 and 45 are rotatably attached to both ends thereof. These upward rolling bearings 45, 45 are arranged in contact with the upper surfaces 21 a, 21 a of the guide rails 21, 21 of each guide member 20 so that the chain 30 is supported so as to be movable along the longitudinal direction of the guide member 20. It has become. The upper rolling bearing 45 is composed of an inner ring 45a, an outer ring 45b arranged on the outer periphery thereof, and a plurality of balls 45c arranged so as to be able to roll between them, like the lower rolling bearing 41 described above. Although it is a ball bearing, it is not limited to this.

  A holding plate 50 that holds one end of the long side of the film 1 is attached to the outer plate 31 via an arm 60 that extends toward the conveyance path of the film 1. The holding plate 50 has a long plate shape, the surface direction of which is arranged in parallel with the installation floor surface of the conveying device 10, and a plurality of piercing pins 51 projecting from the upper surface thereof. The film 1 is pierced and held (see FIGS. 2 and 3). The number of piercing pins 51 in the width direction of the film 1 is, for example, 2 to 5.

  As shown in FIGS. 2 and 3, the arm 60 in this embodiment includes a bent portion 65 formed by bending a long plate-like plate material, and a pair formed by bending outward from an end portion of the bent portion 65. The fixing parts 63, 63 are configured. The pair of fixing portions 63, 63 are fixed to the upper surfaces of the arm fixing portions 31a, 31a of the outer plate 31 via bolts 63b, respectively, and the arm 60 is attached to the outer plate 31.

  As shown in FIG. 3, the bent portion 65 extends downward from the fixed portion 63 fixed to the outer plate 31 so as to be orthogonal to the support surface F of the film 1 arranged parallel to the floor surface. One side portion 66, an intermediate portion 67 extending substantially parallel to the support surface F of the film 1 from the lower end of the one side portion 66, and an end portion of the intermediate portion 67 orthogonal to the support surface F of the film 1 In order to return in such a direction, it has a portion that is formed in a substantially U-shape and is formed by the other side portion 68 extending upward. Further, the bent portion 65 has a distal end portion 70 that is bent outward so as to be perpendicular to the other side portion 68 and is fixed to the lower surface of the holding plate 50.

  The holding plate 50 attached to the chain 30 via the arm 60 has a film support surface 52 (see FIG. 3) that is a contact surface between the upper rolling bearing 45 and the guide rail 21 of the guide member 20. The guide rail 21 is arranged so as to be positioned above the upper surface 21 a of the guide rail 21.

  Further, the bent portion of the arm may have the shape shown in FIGS. 4A to 4C or other shapes, and after being extended in any direction intersecting the support surface F of the film 1. Any shape that is bent so as to return to the support surface direction may be used.

  The bent portion 65a shown in FIG. 4A is connected to one side portion 66a extending downward from the base end portion 63 so as to be orthogonal to the support surface F of the film 1, and to the end portion of the one side portion 66. A bent arc-shaped intermediate portion 67a and an other side portion 68a extending upward so as to return from one end of the intermediate portion 67a in a direction perpendicular to the support surface F of the film 1. It has the part which was made.

  The bent portion 65b shown in FIG. 4 (b) is formed from the one end portion 66b extending downward from the base end portion 63 so as to be orthogonal to the support surface F of the film 1, and from the lower end portion of the one end portion 66b. The other side portion 68b extending upward is formed so as to return in a direction obliquely intersecting with the support surface F, and has a substantially V-shaped bent portion.

  Similar to the bent portion 65 shown in FIG. 3, the bent portion 65 c shown in FIG. 4C includes one side portion 66 c that extends downward so as to be orthogonal to the support surface F of the film 1, and the one side portion 66 c. Bent into a substantially U-shape comprising an intermediate part 67c extending from the lower end of the film and an other side part 68c extending upward from one end of the intermediate part 67c in a direction orthogonal to the support surface F of the film 1 And a structure in which the length of the one side portion 66c and the other side portion 68c is shorter than the one side portion 66 and the other side portion 68 of the bent portion 65 shown in FIG. It has become.

  Next, the usage method and effect of the film transport apparatus 10 having the above structure will be described.

  As the film 1, for example, a thin film made of a synthetic resin, a sheet made of a fiber such as paper or cloth, or a film containing a metal foil made of metal can be used. Among these, a polyimide film that can be used as an electric insulating film, a heat insulating film, a base film of a flexible circuit board, etc. is preferable, and a polyimide precursor obtained from a tetracarboxylic dianhydride component and a diamine component. A polyimide self-supporting film obtained by casting or coating a solvent solution on a support is preferred. The film 1 used in the present invention is preferably a polyimide self-supporting film or a polyimide film in which imidization has proceeded by heat-treating a polyimide self-supporting film.

  Moreover, the conveyance apparatus 10 in this embodiment uses the above-mentioned polyimide self-supporting film as the film 1, and suppresses shrinkage due to heating by holding both ends of the film in the curing process. Therefore, it is used as a so-called tenter device.

  And the both ends of the long side of the film 1 are arranged between the holding plates 50 and 50 attached to the respective chains 30 via the arms 60, and the piercing pins 51 are pierced into the film 1, Both ends of the film 1 are held by holding plates 50 and 50.

  When the drive sprocket 25 is rotated by a driving means (not shown) in this state, the upper surfaces 21a and 21a of the guide rails 21 and 21 are guided while the respective chains 30 are guided by the guide member 20 including the pair of guide rails 21 and 21. While being supported by the moving upward rolling bearings 45, 45, it rotates in the direction of the arrow in FIG. 1, and with the rotation of the chain 30, the holding plates 50, 50 move both ends of the film 1 through the arms 60. The film 1 moves while being held so that the film 1 travels in the direction indicated by the arrow A in FIGS.

  At this time, the bent portion 65 of the arm 60 in this embodiment has one side portion 66 extending downward with respect to the support surface F of the film 1, and then the other side portion 68 via the intermediate portion 67. Since it has a structure that is bent so as to return upward, the center of gravity of the arm 60 is disposed below, and the chain moves between the pair of guide rails 21 and 21 and moves along the guide member 20. The running stability of 30 can be improved.

  When the film 1 is shrunk during conveyance as in the curing process of the polyimide self-supporting film, the chain 30 is moved through the holding plate 50 and the arm 60 in the direction perpendicular to the traveling direction of the film 1 (see FIG. 3). Tension acts on the arrow B).

  At this time, since the holding plate 50 that supports the film 1 is indirectly attached via the arm 60 having the bent portion 65, when the tension due to the contraction of the film 1 acts, the bent portion 65 of the arm 60 is bent. Thus, the tensile force applied to the chain 30 can be reduced. For this reason, it is possible to suppress the roller 40 of the chain 30 and the downward rolling bearing 41 from coming into contact with the inner surface of the guide rail 21 on the film transport path side of the guide member 20 with a strong pressure or biased, and It is possible to reduce the frictional force and unbalanced load generated between the chain 30 and the guide member 20 and between the members of the chain 30, and to prevent the generation of metal powder or the like due to wear of the chain 30 or the guide member 20. Can do. Therefore, it is possible to prevent the metal powder or the like from adhering to the film 1 to cause a product defect, and to improve the durability of the chain 30.

  Further, in this embodiment, the upper rolling bearings 45 and 45 attached to the chain 30 are movably contacted with the upper surfaces 21a and 21a of the guide rails 21 and 21 of the guide member 20, so that the chain 30 rolls upward. Since it is supported by the bearings 45 and 45 (see FIG. 3), the chain 30 is inclined and an unbalanced load is generated, or a part of the chain 30 is in contact with the guide rail 21 locally, so that wear easily proceeds. Can be prevented.

  Further, as shown in FIG. 3, the film support surface 52 of the holding plate 50 that supports the film 1 is more than the contact surface between the upper rolling bearing 45 and the guide rail 21 of the guide member 20 (the upper surface 21 a of the guide rail 21). Even when the distance between the holding plate 50 and the outer plate 31 of the chain 30 is close, the tensile force applied to the chain 30 by the bent portion 65 of the arm 60 can be reduced. Generation | occurrence | production of the metal powder etc. by abrasion can be reduced effectively.

  Further, in this embodiment, a downward rolling bearing 41 having an outer diameter larger than that of the roller 40 is disposed above the roller 40 of the chain 30. When the chain 30 is pulled by contraction of the film 1, the downward rolling bearing 41 is Since it abuts against the inner surface of the guide rail 21 on the film transport path side, the axis C (see FIG. 3) of the pin 36 of the chain 30 is further less inclined with respect to the guide rail 21, and the chain 30 and the guide member 20 The frictional force can be reduced more effectively.

  FIG. 5 shows another embodiment of the film transport apparatus according to the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The film transport apparatus 10a (hereinafter referred to as “transport apparatus 10a”) in this embodiment has a structure in which the height of the holding plate 50 can be adjusted.

  As shown in FIG. 5 (a), the distal end portion 70 of the bent portion 65 constituting the arm 60 in the transport apparatus 10a is a holding plate that supports the holding plate 50 that is arranged so as to be parallel to the floor surface. 71 and a mounting plate 72 extending from the end of the holding plate 71 substantially perpendicular to the support surface F of the film 1 and having a pair of upper and lower bolts 75 and 75 inserted therethrough. Further, as shown in FIG. 5B, slit grooves 73 and 73 are formed along the vertical direction on both sides in the width direction of the other side portion 68 of the bent portion 65 constituting the arm 60.

  Then, the bolt 75 inserted through the mounting plate 72 is inserted into the slit groove 73 and tightened with the nut 76, so that the distal end of the bent portion 65 with respect to the other side portion 68 as shown in FIG. The portion 70 is fixed, and the holding plate 50 is attached at a predetermined height. When it is desired to change the height of the holding plate 50, the nut 76 is loosened from the bolt 75, the bolt 75 is moved up and down in the slit groove 73, and tightened with the nut 76 again at a predetermined position. As indicated by the imaginary line in a), the height of the holding plate 50 can be changed.

  According to this embodiment, by adjusting the attachment position of the holding plate 50 to the arm 60, it can be adjusted to an appropriate height, so that the versatility of the chain 30 can be enhanced.

  Note that the above-described height adjustment structure of the holding plate 50 is an example, and other structures can be appropriately employed.

1 Film F Support surface 10, 10a Film transport device (transport device)
20 Guide member 21 Guide rail 21a Upper surface 25 Drive sprocket 27 Driven sprocket 30 Chain 31, 32 Outer plate 31a, 31a Arm fixing part 33, 34 Inner plate 35 Bush 36 Pin 37 Washer 38 Nut 40 Roller 41 Downward rolling bearing 41a Inner ring 41b Outer ring 41c Ball 43 Spindle 45 Upper rolling bearing 45a Inner ring 45b Outer ring 45c Ball 50 Holding plate 51 Piercing pin 52 Film support surface 60 Arm 63 Fixing part 63b Bolts 65, 65a, 65b, 65c Bending part 66, 66a, 66b, 66c One side Portions 67, 67a, 67c Intermediate portion 68, 68a, 68b, 68c Other side portion 70 Tip portion 71 Holding plate 72 Mounting plate 73 Slit groove 75 Bolt 76 Nut

Claims (7)

A film transport device transported in a band shape,
A guide member comprising a pair of guide rails disposed along both sides of the film conveyance path, a chain that is sandwiched between the pair of guide rails and moves along the guide member, and the chain attached to the chain, A holding plate for holding both ends of the film,
The holding plate is attached via an arm extending from the outer plate constituting the chain toward the conveyance path,
The arm has a bent portion that extends from the outer plate in any direction intersecting the support surface of the film and then bent so as to return to the support surface direction again. The film transport apparatus is characterized in that the holding plate is connected to the tip of the part.   The film is a polyimide self-supporting film, and the film transport device is a tenter device for holding the both ends of the film and suppressing shrinkage due to heating when the film is heat-treated. Item 2. A film conveying apparatus according to Item 1.   The support surface of the film is disposed substantially in parallel with the floor surface on which the film transport device is placed, and the arm extends downward with respect to the support surface, and then upwards again. The film conveying apparatus according to claim 1, further comprising a bent portion bent so as to be directed back. The chain includes a pair of outer plates, a pair of inner plates, a bush disposed through end portions of the inner plate, and an end of the outer plate and the inner plate inserted into the bush. A pin for connecting the parts, a roller mounted on the outer periphery of the bush, and one outer plate connected to the arm are rotatably mounted via a support shaft orthogonal to the longitudinal direction of the outer plate. An upward rolling bearing,
Each guide member disposed along both sides of the film conveyance path has a pair of guide rails erected in parallel so as to receive at least a portion excluding the outer plate to which the arm is connected,
The upper rolling bearing is in contact with the upper part of the guide rail of the guide member and movably supports the chain, and the film support surface of the holding plate is in contact with the upper rolling bearing and the guide member. The film transport apparatus according to claim 1, which is located above the surface.   On the outer periphery of the bush, the roller and a downward rolling bearing having an outer diameter larger than that of the roller are disposed, and the downward rolling bearing has at least one disposed above the roller, 5. The film transport device according to claim 4, wherein when the chain is pulled by a contraction force of the film, the lower rolling bearing is configured to contact an inner surface of the guide rail positioned on the film transport path side. .   The film conveying apparatus according to claim 1, wherein the bent portion of the arm is bent in a U shape, a V shape, or a U shape.   The bent portion of the arm has a portion extending substantially perpendicular to the support surface of the film at a tip portion thereof, and the holding plate is attached to the tip portion of the arm so that the position thereof can be changed. Item 7. The film transport apparatus according to any one of Items 1 to 6.