JP2012082032A - Tenter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tenter device achieving reduction in sliding friction resistance of tenter chains even in a high-temperature environment and reducing generation of metal powder due to wear by providing a structure which is hard to tilt.SOLUTION: The tenter device includes: guide plates 41 arranged on both sides of a carrying passage of a film F; and the pair of tenter chains 5 moved along the guide plates 41. Each of the tenter chains 5 includes: a film holding mechanism holding an edge of the film F; a shaft member 60 fixed to a member to which the film holding mechanism is fixed; and a first bearing 61 supported by the shaft member 60. The tenter chain 5 is movably supported by the first bearing 61. The tenter chain further includes an inner link and an outer link, and the inner link includes inner plates 51a, 51b, a bush 52 interconnecting the inner plates 51a, 51b and a second bearing 73 supported by the outer periphery of the bush 52.

Description

  The present invention relates to a tenter device used for transporting a film in a film manufacturing process.

  In the film manufacturing process, a tenter device is used to convey the film in the longitudinal direction while gripping the film so as to have a predetermined width when the film being manufactured is heat-treated. The tenter device includes a pair of left and right tenter rails and a pair of left and right tenter chains that move along the tenter rails and that have film holding members at predetermined intervals.

  An example of this type of tenter device is disclosed in Patent Document 1. Hereinafter, the tenter device disclosed in Patent Document 1 will be described with reference to FIG. 11 which is a cross-sectional view of a tenter rail and a tenter chain on one side thereof. As shown in FIG. 11, the tenter rail 140 includes support walls 141 that are spaced apart from each other, and a chain support roller 142 that is rotatably supported between the support walls 141. 150 is disposed between the support walls 141 and supported on the chain support roller 142.

  The tenter chain 150 is configured by alternately connecting inner links having a pair of inner plates 151a and 151b and outer links having a pair of outer plates 154a and 154b by connecting pins 155. The inner link further includes rollers 153a and 153b through which the connecting pin 155 is inserted through a bush (not shown). These rollers 153a and 153b are arranged in the axial direction of the connecting pin 155, and can rotate independently of the connecting pin 155, respectively.

  The tenter chain 150 is used in a posture in which the opposing direction of the outer plates 154a and 154b is in the vertical direction. Therefore, the lower outer plate 154b is supported on the chain support roller 142 in use.

  The outer plate 154a located on the upper side in use is bent in the shape of a crank and extends in the lateral direction, and a pin plate 164 having a plurality of piercing pins 165 is attached to the tip thereof. The edge of the film F is pierced and held by a piercing pin 165, and the film F is conveyed by moving the tenter chain 150 in this state.

  When the film F is heat-treated, volume shrinkage occurs. In addition, the film F may be stretched or shrunk (stress relaxation) in the width direction during the heat treatment using the expansion / contraction function of the tenter rail. As a result, a tension in the lateral direction (in the direction of arrow A in the figure) acts on the tenter chain 150, and the tenter chain 150 moves in the film F conveying direction in an inclined state. When the tenter chain 150 is tilted, the upper roller 153 a comes into contact with the inner support wall 141, and the lower roller 153 b comes into contact with the outer support wall 141. When the tenter chain 150 moves in this state, the rollers 153a and 153b can rotate in opposite directions, so that the rotation of the rollers is not hindered even if the tenter chain 150 is tilted.

JP 2001-146344 A

  In the tenter device described above, the tenter chain has two upper and lower rollers. However, even if the rollers have two upper and lower rollers, the tenter chain is still tilted by the tension of the film to be gripped. When the tenter chain is tilted, the roller locally contacts the support wall, so a high contact pressure acts on the roller, and an offset load acts between the roller and the shaft that supports it, making it difficult for the roller to rotate. . Therefore, when the roller rotates, the roller and the member supporting the roller slide in a state where a large force is applied locally. As a result, the roller and the member supporting the roller are gradually worn by sliding of the roller, and metal powder is generated due to this wear. Furthermore, since the tenter chain also tilts on the contact surface between the support roller and the tenter chain, a high contact pressure locally acts on the support roller, so that metal powder is generated due to wear. When the tenter chain is kept operating for a long period of time, the metal powder accumulates between the components constituting the tenter chain, and may hinder the rotational capability of the roller and the operation of the tenter chain. Moreover, when metal powder adheres to the film in process, the quality of the film is lowered, which is not preferable.

  It is conceivable to use lubricating oil in order to reduce the friction between the parts constituting the tenter chain. However, for example, in the heat treatment step of the polyimide film, the maximum temperature may reach 200 to 600 ° C. In such a high temperature environment, the lubricating oil evaporates, and the evaporated lubricating oil is transferred to the polyimide film. Lubricating oil is difficult to use because it may adhere and cause quality degradation of the polyimide film.

  An object of the present invention is to provide a tenter device that has a structure in which the tenter chain is not easily tilted and does not generate an unbalanced load and that functions as a roller to reduce sliding friction resistance and hardly generate metal powder due to wear. Another object of the present invention is to provide a tenter device that can be operated without using lubricating oil and is suitable for use in a high temperature environment.

In order to achieve the above object, a tenter device of the present invention is a tenter device having a guide member disposed on both sides of a film conveyance path, and a pair of tenter chains that move along the guide member,
The tenter chain
A plurality of inner links and a plurality of outer links which are alternately connected;
A film holding mechanism for gripping the edge of the film;
A shaft member which extends in a direction parallel to the film transport surface and perpendicular to the longitudinal direction of the guide member, and is directly or indirectly fixed to the same member as the member to which the film holding mechanism is fixed;
A rotating body rotatably supported around a shaft member for supporting the tenter chain movably;
A second bearing rotatably supported adjacent to the guide member in the width direction of the film;
Have

  In the tenter device of the present invention, the tenter chain may have a plurality of second bearings, in which case at least one of the plurality of second bearings may be a rolling bearing, or at least one of them may be a sliding bearing. Also good. In order to make the tenter device particularly suitable for use at high temperatures, the second bearing is preferably lubricated with a solid lubricant. By using the second bearing lubricated with the solid lubricant, the tenter device can be operated without using lubricating oil, and a tenter device suitable for use in a high temperature environment can be provided.

  According to the present invention, the tenter chain has a rotating body for movably supporting the tenter chain, and the member that supports the shaft member that supports the rotating body is the same as the member that supports the film holding mechanism. With a certain configuration, even if the tension of the film held by the film holding mechanism acts on the tenter chain, the tenter chain can be made difficult to tilt. Further, the second bearing serves as a roller between the tenter chain and the guide member, and can prevent the components constituting the tenter chain from rubbing against the guide member during the movement of the tenter chain.

  As a result, the synergistic effect of the posture stabilization function of the tenter chain by the rotating body and the roller function of the rotating body and the second bearing greatly increases the operation of each component of the tenter chain and the sliding friction of the tenter chain. The movement in the longitudinal direction itself becomes smooth. As a result, the wear of each component is reduced, so that the generation of metal powder and the generation of frictional noise can be reduced, and the use period of the tenter chain and the guide member can be extended. Furthermore, generation | occurrence | production of the defective product by adhesion of the metal powder to a film can be suppressed by generation | occurrence | production of metal powder being reduced.

It is a top view of the tenter device by one embodiment of the present invention. It is the figure which expanded the II part of the roller chain shown in FIG. It is the side view which looked at the roller chain shown in FIG. 2 from the pin plate side, and has shown some outer plates in the cross section. It is the IV-IV sectional view taken on the line of the roller chain shown in FIG. It is the VV sectional view taken on the line of the roller chain shown in FIG. It is sectional drawing which cut | disconnected the tenter apparatus by other embodiment of this invention between the outer plates adjacent to the longitudinal direction of a tenter chain. It is sectional drawing similar to FIG. 4 of the tenter apparatus by further another form of this invention. FIG. 8 is a cross-sectional view similar to FIG. 4, showing a modification of the tenter device shown in FIG. 7. It is the top view which expanded a part of tenter chain of the tenter apparatus by further another form of this invention. It is a figure which shows the shaft member reduced in weight of the tenter apparatus by further another form of this invention. It is sectional drawing in the surface perpendicular | vertical to the moving direction of a tenter chain of the tenter rail and the tenter chain of the conventional tenter apparatus.

  Next, embodiments of the present invention will be described with reference to the drawings.

  Referring to FIG. 1, a tenter according to an embodiment of the present invention that is used in a manufacturing process of a film F and transports the film F with its edges (both ends in the width direction) gripped particularly in the heat treatment of the film F. A device 1 is shown.

  The tenter device 1 has a pair of tenter chains 5 disposed on both sides of the film F conveyance path, and a pair of tenter rails 4 that guide the movement of each tenter chain 5. Each tenter chain 5 is configured to be endless and meshes with the drive sprocket 2 and the driven sprocket 3. The tenter rail 4 has a pair of guide plates 41 that extend along the transport direction of the film F and are arranged in parallel to each other, and the tenter chain 5 can pass between the guide plates 41.

  As will be described in detail later, each tenter chain 5 has a plurality of film holding mechanisms, and both edges of the film F are gripped by the film holding mechanisms provided in each tenter chain 5. When the drive sprocket 2 is driven in a state where both edges of the film F are gripped, the tenter chain 5 moves along the tenter rail 4, whereby the film F is conveyed.

  In the tenter device 1 shown in FIG. 1, a pair of tenter rails 4 are arranged in parallel so as to convey the film F with a constant width. However, the tenter rails 4 can be arranged so that the distance between the tenter rails 4 becomes wider or narrower toward the downstream side in the film F conveyance direction. By widening the distance between the tenter rails 4 toward the downstream of the transport direction of the film F, the film F can be stretched in the lateral direction, and conversely, by gradually reducing the distance between the tenter rails 4, the film The stress relaxation of F can be dealt with. Further, the pair of tenter rails 4 can be arranged by appropriately combining two or more of a portion having a constant interval, a gradually widening portion, and a gradually narrowing portion.

  Next, the tenter chain 5 will be described in detail with reference to FIGS.

  The tenter chain 5 is an endless roller chain in which a plurality of inner links and a plurality of outer links are alternately connected. The inner link includes a pair of opposed inner plates 51a and 51b, two bushes 52 connecting them, and two second bearings 73 fixed to the outer periphery of each bush 52 between the inner plates 51a and 51b. And have. A washer may be inserted between the second bearing 73 and the inner plate. The inner plates 51a and 51b are members formed so as to have a longitudinal direction, and the two bushings 52 are arranged at intervals in the longitudinal direction. The diameter of the second bearing 73 is such that the second bearing 73 is positioned adjacent to the guide plate 41 between the pair of guide plates 41 in the width direction of the film F and can contact the guide plate 41. Is smaller than the interval between the pair of guide plates 41 and larger than the width of the inner plates 51a and / or 51b.

  The outer link includes a pair of outer plates 54a and 54b arranged opposite to the outer side of the inner link, and two connecting pins that penetrate the inner plates 51a and 51b and the bushing 52 to connect the outer plates 54a and 54b to the inner link. 55. The outer plates 54a and 54b are members formed so as to have a longitudinal direction, and have a length capable of connecting two adjacent inner links. In this embodiment, the connecting pin 55 is a threaded pin, and the connecting pin 55 is held by a washer 56 and a nut 57 so as not to come off from the outer plates 54a and 54b.

  An attachment plate 63 is fixed to one outer plate 54a located on the upper side of the pair of outer plates 54a, 54b. The attach plate 63 is attached to one side of the outer plate 54a so as to extend to one side of the tenter chain 5 in the width direction perpendicular to the longitudinal direction of the outer plate 54a. A pin plate 64 on which a plurality of piercing pins 65 for holding the film F is projected is fixed to the tip of the attach plate 63. The pin plate 63 and the pin 64 constitute a film holding mechanism in the present invention. The attach plate 63 and the pin plate 64 may be integrated.

  The attachment plate 63 can have any shape as long as the pin plate 64 can be positioned on one side in the width direction of the outer plate 54a. In this embodiment, as shown in FIG. 4, the attachment plate 63 has a tip end portion to which the pin plate 64 is attached positioned between the outer plates 54 a and 54 b and extending in parallel with the outer plates 54 a and 54 b. It has a crank-like cross-sectional shape.

  In the outer plate 54a to which the attach plate 63 is fixed, the shaft member 60 is oriented so that its axial direction is parallel to the width direction of the outer plate 54a, in other words, parallel to the transport surface of the film F and the tenter rail 4 It is fixed in a direction extending in a direction perpendicular to the longitudinal direction. The shaft member 60 is a stepped member whose both end portions are smaller in diameter than other parts, and a first bearing 61 that receives a radial load of the shaft member 60 as a rotating body is provided on the small diameter part. The member 60 is disposed so as to be rotatable around the center. Moreover, as shown in FIG. 10, for example, the shaft member 61 is preferably partially removed by cutting or the like to be reduced in weight.

  The first bearings 61 attached to both end portions of the shaft member 60 have a distance between the two first bearings 61 so that they can be supported on the upper surfaces of the pair of guide plates 41. Is designed to be almost equal. The position of the first bearing 61 in the axial direction with respect to the shaft member 60 is fixed by, for example, a C washer 62.

  As the first bearing 61 and the second bearing 73, any bearing such as a rolling bearing and a sliding bearing can be used as long as it receives a radial load. In this embodiment, as shown in FIGS. 4 and 5, a rolling bearing is used. The rolling bearing has an outer ring, an inner ring, a plurality of rolling elements (balls) disposed between the outer ring and the inner ring, and a spacer that separates the rolling elements in the circumferential direction.

  In the first bearing 61, the inner ring is fixed to the shaft member 60 and the outer ring rotates with respect to the shaft member 60. Accordingly, the tenter chain 5 is supported on the tenter rail 4 by the first bearing 61 so as to be movable in the longitudinal direction of the tenter chain 5. On the other hand, in the second bearing 73, the inner ring is fixed to the bushing 52 and the outer ring rotates with respect to the bushing 52. Thus, as will be described later, when the tenter chain 5 is pulled inward by the film F during the movement of the tenter chain 5 and comes into contact with the side surface of the guide plate 41, the second bearing 73 is placed between the guide plate 41 and the second bearing 73. It is configured so as to move while smoothly rotating in the longitudinal direction.

  Each component constituting the tenter chain 5 described above can be made of stainless steel or the like, as in a normal tenter chain.

  The tenter chain 5 is used in such a posture that the axial direction of the connecting pin 55 is oriented in the vertical direction and the outer plate 54a to which the attachment plate 63 is fixed is the upper side. Each tenter chain 5 is endless so that the pin plate 64 faces outward, and meshes with the drive sprocket 2 and the driven sprocket 3. Each tenter chain 5 is supported on the upper surface of the guide plate 41 by the first bearing 61 in the region where the tenter rail 4 is installed, and the second bearing 73 is positioned between the guide plates 41.

  By installing the pair of tenter chains 5 as described above, the pin plates 64 face each other in the regions of the pair of tenter chains 5 facing each other. If the distance between the tenter chains 5 is appropriately set according to the width of the film F, both edges of the film F can be gripped by piercing the film F with the piercing pins 65 of the opposing pin plate 64.

  When the drive sprocket 2 is driven in a state where both edges of the film F are gripped, the tenter chain 5 is moved, whereby the film F is conveyed. Further, the height of the grip surface of the film F can be controlled by adjusting the length and bending angle of the attach plate 63.

  The tenter chain 5 moves as the first bearing 61 rotates on the guide plate 41. The inner link and the outer link are located between the guide plates 41, thereby restricting the lateral position of the tenter chain 5, so that the tenter chain 5 moves along the tenter rail 4. The upper surface of the guide plate 41 only needs to have a structure that is in contact with the first bearing 61 and does not hinder the rotation of the first bearing 61. For this purpose, the upper surface of the guide plate 41 is preferably flat or smooth. Further, the upper surface of the guide plate 41 may be subjected to surface processing for reducing friction with the first bearing 61.

  The tenter device 1 can be used for the stretching process of the film F by using the expansion / contraction function of the tenter rail 4. Thus, when the tenter apparatus 1 is used for the process of applying tension in the width direction of the film F, the pin plate 64 that holds the film F is pulled in the direction indicated by the arrow A in FIG. Due to the tensile force of the film F, a moment that tilts the tenter chain 5 toward the other tenter chain 5 side acting on the tenter chain 5 acts.

  Hereinafter, the moment acting on the tenter chain 5 will be described in comparison with the conventional tenter chain shown in FIG. However, in the following description, in order to eliminate the influence due to the difference in structure and shape from the connecting portion of the outer link and the inner link to the pin plate, the upper outer plate is a flat plate, and the film F is applied to the flat outer plate. It is considered that the tensile force of

  In this case, the magnitude of the moment generated in the tenter chain by pulling the film F depends on the distance from the surface supported by the tenter rail of the tenter chain to the upper outer plate in the vertical direction. The moment increases. In other words, the greater the distance, the more the tenter chain tilts with less force.

  In the tenter chain 150 shown in FIG. 11, the contact surface between the lower outer plate 154 b and the chain support roller 142 becomes the support surface BS <b> 1 for the tenter rail 140. The support surface BS1 coincides with the lower surface of the lower outer plate 154b that sandwiches the inner link having the pair of inner plates 151a and 151b together with the upper outer plate 154a, and the distance from the support surface BS1 to the upper outer plate 154a. D1 is larger than the distance between the outer plates 154a and 154b.

  On the other hand, as shown in FIG. 4, in the tenter chain 5 of this embodiment, the contact surface between the first bearing 61 and the guide plate 41 becomes the support surface BS <b> 2 for the tenter rail 40. The support surface BS2 is a surface in contact with the outer peripheral surface of the first bearing 61 supported by the shaft member 60 fixed to the upper outer plate 54a, and the distance D2 from the support surface BS2 to the upper outer plate 54a is Although it depends on the outer diameter of the face shaft member 60 and the outer diameter of the first bearing 61, it can be much smaller than the distance D1 shown in FIG.

  Therefore, according to the tenter chain 5 of this embodiment, the moment due to the tensile force of the film F can be made extremely small as compared with the conventional case, and as a result, the inclination of the tenter chain 5 due to the tension of the film F can be suppressed. it can. Suppressing the tilt of the tenter chain 5 allows the parts constituting the tenter chain 5 to operate smoothly without excessive force acting locally, so that metal powder and friction noise are generated due to the friction of each part. Since it becomes difficult to prevent the metal powder from adhering to the film, the film F having a stable quality can be manufactured. Further, since the tenter chain 5 uses a rotating body, the sliding frictional resistance is small, and energy required for operation is small, so that energy saving can be achieved. Since the rotating body is lubricated with a solid lubricant, the tenter device 1 can be operated without using lubricating oil.

  As described above, in the present embodiment, the two first bearings 61 are arranged in each outer link with a gap in the width direction of the outer plate 54a. The arrangement of the first bearing 61 is an arrangement that can effectively counter the inclination of the tenter chain 5 due to the tension of the film F, whereby the attitude of the tenter chain 5 can be further stabilized. Further, since each outer link has the two first bearings 61, the existing tenter rail 40 equipment can be used as it is, so that the tenter device shown in FIG. 11 is replaced with the tenter device of this embodiment. Equipment change costs can be reduced.

  The first bearing 61 is attached to a shaft member 60 fixed to the outer plate 54a, whereby the center of gravity of the tenter chain 5 is located below the support surface BS2. This also contributes to the stabilization of the posture of the tenter chain 5.

  On the other hand, the second bearing 73 contacts the side surface of the guide plate 41 when the tenter chain 5 is tilted or pulled in the width direction of the film F during the movement of the tenter chain 5. Reduces friction. As a result, metal powder and friction noise due to friction are further suppressed, and energy required for movement of the tenter chain 5 can be further reduced.

  In particular, in this embodiment, rolling bearings are used as the first bearing 61 and the second bearing 73, whereby the tenter chain 5 can be moved more smoothly with a smaller driving force.

  As described above, the tenter chain 5 is less likely to generate metal powder due to friction by using the first bearing 61 and the second bearing 73, but it does not occur at all. Even if a rolling bearing is used, some metal powder is generated by long-term operation of the tenter device 1. If this metal powder enters the gap between the outer and inner rings of the rolling bearing and accumulates during long-term operation, it may interfere with the operation of the rolling bearing. Furthermore, it is necessary to prevent the solid lubricant generated in the gap between the outer ring and the inner ring of the bearing from being scattered to the outside due to long-term operation. Therefore, a rolling bearing has a lid (shield) that covers the gap so that metal powder does not easily enter the gap between the outer ring and the inner ring, or the solid lubricant generated in the gap does not scatter to the outside. ). Further, when the rolling bearing has a lid, the rolling bearing preferably has a labyrinth structure that prevents the space outside the lid from communicating linearly with the gap between the inner ring and the outer ring. Further, when attaching the rolling bearing to the shaft member 60, another washer or the like may be newly used between the outside of the shield and the C washer 62.

  Further, in the present embodiment, unlike the prior art, the pin plate 64 is not directly attached to the outer plate 54a, but is attached to the outer plate 54a via the attach plate 63. Each plate 51a, 51b, 54a, 54b constituting the outer link and the inner link is designed to have sufficient mechanical strength to withstand a large tensile load received from the drive sprocket 2 during operation of the tenter chain 5. As a result, the plate thickness also increases to some extent. On the other hand, the tension of the film F is very small as compared with the tensile load received from the drive sprocket 2.

  Therefore, by attaching the pin plate 64 to the outer plate 54a via the attachment plate 63, which is a separate member from the outer plate 54a, the outer plate 54a can secure sufficient mechanical strength while the attachment plate 63 is used as the outer plate. It can be formed with a plate thickness thinner than 54a. Thereby, the weight reduction of the tenter chain 5 is achieved, which contributes to operating the tenter chain 5 with a smaller driving force.

  As described above, it is preferable to attach the pin plate 64 to the outer plate 54a through the attachment plate 63 in order to reduce the weight of the tenter chain 5. However, this is not essential in the present invention. 54a may have a shape (for example, a crank shape) suitable for fixing the pin plate 64, and the pin plate 64 may be directly fixed to the tip portion thereof.

  Although the tenter device according to the present invention can be used for the production of various films, a polyimide film is particularly preferable among the types of films. In the heat treatment such as imidization treatment in the production process of the polyimide film, the tenter device is used in a high-temperature environment such as 200 to 600 ° C. As described above, the tenter device 1 of this embodiment has a structure in which the tenter chain 5 supported on the tenter rail by the rotating body is extremely difficult to tilt, so that it can operate smoothly without using lubricating oil. Suitable for use in high temperature environments where oil cannot be used.

  As described above, the tenter device 1 is suitable for use in a high temperature environment, but the first bearing 61 and the second bearing 73 are particularly important when the tenter device 1 is used in a high temperature environment. In this embodiment, rolling bearings are used as the first bearing 61 and the second bearing 73, but a general rolling bearing is lubricated with a lubricant such as lubricating oil or grease. Since the lubricant evaporates under a high temperature environment, it is difficult to use such a lubricant.

  Therefore, it is desirable that the rolling bearing be structured to be lubricated with a solid lubricant. The solid lubricant can be contained, for example, in at least a part of the rolling element and / or the spacer for circumferentially separating the plurality of rolling elements in the gap between the outer ring and the inner ring. As the solid lubricant, known solid lubricants such as natural or artificial graphite materials, boron nitride, tungsten disulfide and molybdenum disulfide can be used alone or in combination of two or more. Thus, by using a solid lubricant, a rolling bearing can be suitably used over a long period of time even in a high temperature environment.

  As the 1st bearing 61 and the 2nd bearing 73, a sliding bearing can also be used instead of a rolling bearing. Alternatively, by using a rolling bearing and a sliding bearing in combination, at least a part of the first bearing 61 and / or the second bearing 73 can be a rolling bearing or at least a part can be a sliding bearing. However, when sliding bearings are used for the first bearing 61 and the second bearing 73 of the tenter chain 5 used in a high temperature environment, the sliding bearing has a multilayer structure of two or more layers, and the innermost layer contains a solid lubricant. It is preferable to comprise by the layer which carries out.

  Furthermore, although the example which used the 1st bearing 61 as a rotary body was shown in the form mentioned above, the rotary body may be a roller. Even when a roller is used as the rotating body, in consideration of use in a high-temperature environment, it is preferable that the roller has a multilayer structure, and the innermost layer is formed of a layer containing a solid lubricant. Moreover, the roller may be directly supported by the shaft member 60, or may be supported via an appropriate bearing.

  In the above-described embodiment, the configuration is shown in which the pin plate 64 is attached to the upper outer plate 54 a via the attach plate 63 and the first bearing 61 is supported via the shaft member 60. However, as shown in FIG. 6, the attachment plate 63 that supports the pin plate 64 and the shaft member 60 that supports the first bearing 61 that is a rotating body may be fixed to the outer plate 54 b located on the lower side. . The support of the tenter chain is not limited to the guide plate 41 but can be a flat plate. Further, an appropriate guide plate 43 is disposed on the side of the second bearing 73 so that the tenter chain does not come off the predetermined conveyance path, or the guide plate 41 that supports the first bearing 61 below the shaft member 60. Between these, the second bearing 73 can be rotatably arranged, or these can be combined. FIG. 6 shows an example in which all these configurations are combined. However, the tenter chain may be configured not to include the second bearing 73 between the lower guide plates 41, in which case The tenter chain can be supported on a flat plate instead of the guide plate 41 constituting the tenter rail. In FIG. 6, when the tenter chain is guided only by the lower guide plate 41 without arranging the upper guide plate 43, the second bearing 73 between the inner links is a roller as in a normal tenter chain. (Not shown).

  Further, in the above-described embodiment, the tenter chain 5 has the inner link different from the normal roller chain, and has the second bearing 73. However, the inner link has the second bearing 73 as shown in FIG. It is preferable that a roller 53 is provided. The second bearing 73 and the roller 53 are disposed in the axial direction of the bushing 52 that connects the inner plates 51a and 51b, and the inner ring of the second bearing 73 is fixed to the outer periphery of the bushing 52 so that each can operate individually. The roller 53 is rotatably supported on the outer periphery of the bushing 52.

  As described above, the tenter chain 5 is engaged with the drive sprocket 2 and the driven sprocket 3 (see FIG. 1), and operates when the drive sprocket 2 is rotationally driven. The tenter chain 5 is driven during the operation. A large thrust load is repeatedly applied from the sprocket 2. Therefore, when the second bearing 73 having a length substantially equal to the distance between the inner plates 51 a and 51 b is used as shown in FIG. 4, the second bearing 73 meshes with the drive sprocket 2. Depending on the magnitude of the thrust load repeatedly received from the drive sprocket 2, the service life of the second bearing 73 may be shorter than usual.

  Therefore, as shown in FIG. 7, by providing the roller 53 and the second bearing 73, the second bearing 73 has only a function of contacting and rotating with the guide plate 41 as a receiver of the guide plate 41. The drive sprocket 2 and the driven sprocket 3 can be engaged with each other. This allows the tenter chain to be sufficiently durable for long-term use while achieving operation with less driving force, reduced metal wear, and reduced noise during operation. become.

  When the roller 53 is provided in addition to the second bearing 73, the diameter of the roller 53 is preferably smaller than the diameter of the second bearing 73 in order to ensure that the second bearing 73 functions as a receiver for the guide plate 41. By doing so, it is possible to prevent the roller 53 from contacting the guide plate 41 when the tenter chain is pulled in a direction approaching the guide plate 41.

  The mutual positional relationship between the second bearing 73 and the roller 53 is arbitrary. As shown in FIG. 7, the second bearing 73 may be disposed above the roller 53, and vice versa. It may be arranged below 53. However, from the viewpoint that the force received by the second bearing 73 from the guide plate 41 when the second bearing 73 comes into contact with the guide plate 41, the second bearing 73 is located above the roller 53 as shown in FIG. It is preferable to arrange | position. In addition, as shown in FIG. 8, two second bearings 73 can be arranged at intervals in the vertical direction, and a roller 53 can be arranged between the two second bearings 73.

  In the preferred form of the tenter device, multiple bearings may be used. In particular, the longer the distance that the tenter device transports while gripping the film F, the longer the length of the tenter chain. As a result, a huge number of bearings are used. The use of a huge number of bearings leads to complicated maintenance work. Further, in this embodiment, each outer link has a shaft member 60, and each shaft member 60 is provided with two bearings 61. However, the tenter chain 5 is supported in a balanced manner, and there is no hindrance to the transport of the film F. If there is no problem in the production of the film F, it is not necessary that all the outer links have the shaft members 60, and there may be a case where only one bearing 61 is provided for each shaft member 60.

  Thus, for example, as shown in FIG. 10, a configuration in which one bearing 61 for moving the tenter chain is provided for each shaft member 60 can be employed. It is arbitrary which end of the shaft member 60 the bearings 61 are arranged. All the bearings 61 are arranged on the pin plate 64 side, all the bearings 61 are arranged on the side opposite to the pin plate 64, It is possible to arrange the bearings 61 of the part on the pin plate 64 side and the rest on the opposite side so that they are arranged in an appropriate order. Considering the force acting on the tenter chain during the operation of the tenter chain, for stable operation of the tenter chain, as shown in FIG. 10, the plurality of bearings 61 are provided with a pin plate 64 in the moving direction of the tenter chain. It is preferable to arrange alternately on the side and the opposite side.

  Or although not shown in a figure, the shaft member 60 provided with the two bearings 61 and the shaft member 60 provided with only one bearing 61 are combined by arrangement | positioning suitably, or some outer links among some outer links It is also possible to attach the shaft member 60 only to the above. Even when the shaft members 60 are attached to some of the outer links, each shaft member 60 is provided with one or two bearings 61 in any arrangement, and to which inner link the shaft member 60 is attached. It is optional whether it is attached.

  As described above, the arrangement of the shaft member 60 and the bearing 61 in the entire tenter chain 5 is such that the tenter chain 5 is supported in a well-balanced manner and does not interfere with the transport of the film F and does not cause a problem in the production of the film F. It is optional if it exists.

  In addition, the second bearing 73 can be attached to only some of the bushes 52 instead of all the bushes 52. In this case, it is arbitrary which bush 52 is attached to the second bearing 73 among the numerous bushes 52 as the entire tenter chain. Moreover, only the roller 53 is attached to the bush 52 to which the second bearing 73 is not attached.

  The maintenance work of the tenter chain can be reduced by reducing the number of bearings used as described above. Moreover, since the weight of the tenter chain can be reduced by reducing the number of bearings used, the tenter device can be driven with a smaller driving force, and the tenter chain can be provided at a low cost.

  Moreover, although the piercing pin type holding mechanism is shown as the film F holding mechanism in the above-described form, a clip type or chuck type holding mechanism that holds the film F by gripping the edge of the film F is used instead. You can also.

DESCRIPTION OF SYMBOLS 1 Tenter device 2 Drive sprocket 3 Driven sprocket 4 Tenter rail 5 Tenter chain 51a, 51b Inner plate 52 Bush 53 Roller 54a, 54b Outer plate 55 Connecting pin 60 Shaft member 61 First bearing 63 Attached plate 64 Pin plate 65 Piercing pin 73 First 2 bearings

Claims (12)

A tenter device having a guide member disposed on both sides of a film conveyance path, and a pair of tenter chains that move along the guide member,
The tenter chain is
A plurality of inner links and a plurality of outer links which are alternately connected;
A film holding mechanism for gripping the edge of the film;
A shaft member extending in a direction parallel to the film transport surface and perpendicular to the longitudinal direction of the guide member, and directly or indirectly fixed to the same member as the member to which the film holding mechanism is fixed;
A rotating body rotatably supported around the shaft member for supporting the tenter chain movably;
A second bearing rotatably supported adjacent to the guide member in the width direction of the film;
A tenter device having.   2. The inner link according to claim 1, wherein the inner link includes a pair of opposed inner plates and a bush connecting the pair of inner plates, and the second bearing is supported on an outer periphery of the bush. Tenter device.   The tenter device according to claim 1 or 2, wherein the tenter chain includes a plurality of second bearings, and the plurality of second bearings are rolling bearings, sliding bearings, or a combination thereof.   The tenter device according to claim 3, wherein the second bearing is a bearing lubricated by a solid lubricant.   5. The tenter device according to claim 1, comprising a plurality of the rotating bodies, wherein at least one of the plurality of rotating bodies is a first bearing.   The tenter device according to claim 5, comprising a plurality of the first bearings, wherein the plurality of first bearings is a rolling bearing, a sliding bearing, or a combination thereof.   The tenter device according to claim 5 or 6, wherein the first bearing is a bearing lubricated by a solid lubricant.   The tenter device according to any one of claims 1 to 4, wherein the rotating body is a roller.   The tenter device according to any one of claims 1 to 8, wherein the shaft member and the film holding mechanism are fixed to an outer plate that is one of components constituting the outer link.   The tenter device according to claim 9, wherein the film holding mechanism is attached to the outer plate via an attachment plate.   The tenter device according to claim 10, wherein a thickness of the attachment plate is thinner than a thickness of the outer plate.   The film holding mechanism includes a pin plate and a plurality of piercing pins provided on the pin plate, and the film is gripped by piercing the film with the plurality of piercing pins. The tenter device according to item.

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