JP2012016855A - Relaxation processing mechanism of film, and laterally stretching machine of film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film relax processing mechanism which is a film biaxial relaxation processing mechanism capable of relaxing a film in a carrying direction and can be formed with smaller number of parts with a simpler structure.SOLUTION: The film relaxation processing mechanism includes: a truck 3 which moves holding an end part of the film 1; a guide rail 18 which has a first surface 21 and a second surface 23 being located at an opposite side to the first surface 21 and guides the truck 3 while the first surface 21 and the truck 3 being carried out slide contact; and a chain 2 bendably provided to connect a plurality of trucks 3 separated with spacing in the advance direction of the track 3. The film relaxation processing mechanism further includes: a first roller 24 which is provided on the truck 3 and revolves while contacting the first surface 21 of the guide rail 18; and a first roller 22 which is provided in the chain 2 without being fixed to the truck 3 and revolves while contacting to the second surface 23 of the guide rail 18, wherein the guide rail 18 has parts different in spacing from the first surface 21 and the second surface 23.

Description

  The present invention relates to a film relaxation treatment mechanism for relaxing a film in two orthogonal axes, and a transverse stretching machine including the relaxation treatment mechanism. In particular, the present invention relates to a film relaxation processing mechanism that relaxes the film while gripping and transporting the belt-shaped film.

  A film-like material made of a synthetic resin (hereinafter simply referred to as a film) has an increased film strength and transparency by orienting the molecules of the synthetic resin. Therefore, in a state where heat is applied to the film, the film is often stretched in a first direction and a second direction (also referred to as a longitudinal direction and a transverse direction, respectively) parallel to the film surface and perpendicular to each other.

  As a method of stretching the film in the first and second directions, a sequential stretching method is known in which the film is stretched in the first direction and then stretched in the second direction while being transported in the first direction. .

  In the method of stretching the film in the first direction in the sequential stretching method, an apparatus called a longitudinal stretching machine is used. In the longitudinal stretching machine, at least two transport rolls for transporting the film in the first direction are arranged at an interval in the first direction.

  In the longitudinal stretching machine, in order to stretch the film in the first direction, a part of the film is wound around each of the transport rolls, and the roll at the front in the transport direction is faster than the transport roll at the rear in the transport direction. Rotate toward the transport direction. As a result, simultaneously with the movement of the film in the transport direction, tension in the first direction is applied to the film, and the film is stretched in the first direction.

  In the method of stretching the film in the second direction in the sequential stretching method, an apparatus called a transverse stretching machine is used. In the transverse stretching machine, the carriage that holds the end of the film is disposed so as to face the second direction. Further, the transverse stretching machine is provided with a carriage moving mechanism for moving the carriage in the first direction and the second direction.

  The horizontal stretching machine grips both ends of the film in the second direction using a pair of carts in order to stretch the film in the second direction. Thereafter, the film is stretched in the second direction by moving each or one of the pair of carts in the second direction so as to widen the distance between the pair of carts. At this time, by moving the pair of carts in the first direction, the film can be stretched in the second direction while transporting the film.

  Each of the pair of carriages is configured to move along a predetermined circulation path, and a plurality of carriages are continuously arranged in each circulation path to form a film that is long in the first direction. The film can be continuously stretched in the second direction. That is, in the sequential stretching method, a long film can be continuously stretched in two directions in the first direction using a longitudinal stretching machine and a lateral stretching machine, and the productivity of the film is improved.

  On the other hand, when the film is stretched in two directions, the internal stress and thermal contraction rate of the film increase. As a result, when the film is cooled in a stretched state, sink marks and warpage are likely to occur in the film, and the shape accuracy of the film may be lowered. As the shape accuracy of the film decreases, optical performance such as refractive index varies. In an optical use film used as a component of a liquid crystal screen, since an image is displayed through the film, a uniform optical performance is required for the film. Therefore, improvement of the shape accuracy of the film has been a problem. .

  Therefore, in the sequential stretching method, a film relaxation treatment mechanism that reduces the internal stress and heat shrinkage rate of the film by simultaneously relaxing the film in the first and second directions after stretching the film in the second direction is proposed. (See Patent Documents 1-3). By cooling the film in a relaxed state, the film is cured in a state where the internal stress and thermal shrinkage rate of the film are reduced, and the shape accuracy of the film is improved.

Japanese Examined Patent Publication No. 7-64022 JP-A-6-211397 JP-A 64-85736

  Patent Document 1 discloses a film relaxation processing mechanism in which a film is simultaneously relaxed in a first and second directions by using a carriage moving mechanism of a horizontal stretching machine to cool and cure the film.

  The configuration and problems of the transverse stretching machine and the relaxation processing mechanism disclosed in Patent Document 1 will be described.

  FIG. 13 is a plan view showing an outline of a transverse stretching machine in Patent Document 1. FIG. As shown in FIG. 13, in the transverse stretching machine, the film 1 stretched in the first direction X by a longitudinal stretching machine (not shown) is conveyed along the first direction X. In the transverse stretching machine, a pair of chains 2 are arranged on both sides in the second direction Y of the film 1 so as to circulate in an endless belt shape.

  FIG. 14 is an enlarged plan view of a carriage connected to one chain 2 of a pair of chains 2 facing in the second direction Y of the transverse stretching machine shown in FIG. 13 and its peripheral mechanism. The carriage 3 runs along a guide rail (not shown) laid on the lateral stretching machine. As shown in FIG. 14, the cart 3 is provided with a clamp 4 that holds an end of the film 1 in the second direction Y. A plurality of carriages 3 are connected to each other in the first direction X with a chain 2 at intervals.

  The chain 2 is formed by connecting a plurality of chain links 5 in series via hinges. Each chain link 5 is rotatable about a hinge as a rotation axis. The hinge includes a fixed hinge 6 a that is fixed to each carriage 3 and a moving hinge 6 b that is not fixed to the carriage 3. By moving the moving hinge 6b in the second direction Y, the chain 2 is bent, and the distance between the carts 3 adjacent to each other in the first direction X can be changed.

  The film relaxation processing mechanism disclosed in Patent Document 1 further includes a member (not shown) provided so as to protrude from the moving hinge 6b and an adjustment rail 7 provided so as to contact the member. ing. The adjustment rail 7 is laid so that the moving hinge 6b can move as the carriage 3 moves. That is, as the carriage 3 moves, the adjustment hinge 7 moves the moving hinge 6b in the second direction Y, whereby the chain 2 is bent and the interval between the adjacent carriages 3 is reduced.

  As shown in FIG. 13, as the film 1 is conveyed, the film 1 is stretched in the second direction Y by widening the distance between the chains 2 facing each other in the second direction Y, and the distance is reduced. As a result, the film 1 is relaxed in the second direction Y. When the film 1 is relaxed in the second direction Y, the film 1 is also relaxed in the first direction X by reducing the distance between the carts 3 (FIG. 14) adjacent in the first direction X. .

  Also in Patent Document 2 and Patent Document 3, as in Patent Document 1, there is a film relaxation processing mechanism that moves the moving hinge 6b in the second direction Y and changes the distance between the carts 3 adjacent to each other in the first direction X. It is disclosed. In the film relaxation processing mechanism disclosed in Patent Document 2 and Patent Document 3, adjustment provided to project from one of the two chain links 5 connected via the moving hinge 6b. A lever is further provided. By using the adjustment rail 7 and moving the adjustment lever along with the movement of the carriage 3, the chain link 5 can rotate about the fixed hinge 6a as the rotation axis, and the moving hinge 6b can be moved.

  Thus, in the film relaxation processing mechanism disclosed in Patent Document 1, Patent Document 2 and Patent Document 3, in addition to the guide rail for guiding the carriage 3, the adjustment rail 7 for bending the chain 2 is provided. Since it is necessary, the structure of the relaxation processing mechanism may be complicated. Moreover, since the adjustment rail 7 is provided, there is a possibility that the cost of the relaxation processing mechanism is increased.

  Therefore, the present invention provides a biaxial relaxation processing mechanism for a film that can relax the film in the transport direction, and a film relaxation processing mechanism that is formed with a simpler structure with a smaller number of parts. With the goal.

  In order to achieve the above object, one aspect of the present invention includes a carriage that grips and moves an end of a film, and a first surface and a second surface that is located on the opposite side of the first surface. A guide rail that guides the carriage while the first surface and the moving carriage are in sliding contact with each other, and a plurality of carriages are connected at intervals in the traveling direction of the carriage, and are provided so as to be bent. And a film relaxation processing mechanism for relaxing the film gripped by the carriage in the traveling direction of the carriage by bending the chain. In this aspect, the present invention provides a first roller that is provided on the carriage and rotates while contacting the first surface of the guide rail, and the carriage is provided on the chain without being fixed. And a second roller that rotates while abutting against the surface, wherein the guide rail has a portion where the distance between the first surface and the second surface is different.

  According to the present invention, the biaxial relaxation processing mechanism of a film that can relax the film in the transport direction can be made a simpler structure with a smaller number of parts.

It is a top view which shows the outline of the transverse drawing machine which can apply embodiment of this invention. It is sectional drawing when the trolley | bogie which comprises the 1st Embodiment of this invention, and its periphery mechanism is seen from upper direction (BB sectional drawing shown in FIG. 3). It is sectional drawing when the trolley | bogie shown in FIG. 2 and its peripheral mechanism are cut | disconnected by the surface (AA surface shown in FIG. 2) which cross | intersects perpendicular | vertical to a trolley | bogie advancing direction. It is a top view for demonstrating the structure of the guide rail which makes 1st Embodiment. It is a top view for demonstrating the other structure of the guide rail which makes 1st Embodiment. It is sectional drawing when the guide rail shown in FIG. 5 is cut | disconnected by the surface (DD surface shown in FIG. 5) which cross | intersects perpendicularly with a trolley | bogie advancing direction. FIG. 9 is a cross-sectional view (GG cross-section shown in FIG. 8) of the carriage and its peripheral mechanism at a position where the guide rail thickness is thicker than that shown in FIG. It is sectional drawing when the trolley | bogie shown in FIG. 7 and its peripheral mechanism are cut | disconnected by the surface (EE surface shown in FIG. 7) which cross | intersects perpendicularly | vertically with a trolley | bogie advancing direction. It is the schematic which shows the change of the guide rail thickness in the two-way relaxation zone shown in FIG. It is sectional drawing when the trolley | bogie which comprises the 2nd Embodiment of this invention, and its periphery mechanism are seen from upper direction. FIG. 11 is a diagram in which an external / external link is applied to the second embodiment shown in FIG. 10, and the cart and its peripheral mechanism shown in FIG. It is a figure equivalent to sectional drawing at the time of doing. It is sectional drawing when the trolley | bogie which comprises the 3rd Embodiment of this invention, and its periphery mechanism are seen from upper direction. It is a top view which shows the outline of the transverse drawing machine currently disclosed by patent document 1. FIG. It is the top view to which the trolley | bogie connected to one chain of a pair of chains facing in the 2nd direction of the horizontal stretcher shown in FIG. 13, and its periphery mechanism were expanded.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view schematically showing a transverse stretching machine to which an embodiment of the present invention can be applied. In order to reduce the influence of gravity when the film 1 is stretched or relaxed, the transverse stretcher is provided so that the second direction Y is horizontal.

  As shown in FIG. 1, the transverse stretching machine includes an inlet 8 for taking in the film 1 and an outlet 9 for discharging the film 1 to the outside. In the transverse stretching machine, between the inlet 8 and the outlet 9, a preheating zone 10 for applying heat to the film 1, a stretching zone 11 for stretching the film 1 in the second direction Y, and the film 1 are maintained at a predetermined temperature. A heat treatment zone 12, a relaxation zone 13 for relaxing the film 1 in the first and second directions X and Y, and a cooling and curing zone 14 for cooling and curing the film 1 are provided in this order.

  The film 1 sent to the inlet 8 is stretched in the first direction X by a longitudinal stretching machine (not shown). Therefore, an internal stress parallel to the first and second directions X and Y is generated in the film 1 stretched in the second direction Y by the transverse stretching machine. By relaxing and cooling the film 1 in the first and second directions X and Y in the relaxation zone 13, the internal stress generated when the film 1 is stretched is reduced, and the thermal contraction rate of the film 1 is reduced. Can do.

  The transverse stretching machine is provided with a carriage moving mechanism 15 for conveying the film 1 from the inlet 8 to the outlet 9. The carriage moving mechanism 15 includes a carriage 3 that moves while gripping the end of the film 1 in the second direction Y, and a plurality of carriages 3 are connected to each other with a chain 2 at intervals. By moving the chain 2, the plurality of carriages 3 move simultaneously.

  A drive sprocket 16 for moving the chain 2 is provided at the outlet 9, and a return sprocket 17 for reversing the traveling direction of the chain 2 is provided at the inlet 8. The chain 2 is provided so as to circulate between the drive sprocket 16 and the return sprocket 17 in an endless belt shape. The chain 2 is moved by driving the drive sprocket 16 using a drive device (not shown), and the plurality of carriages 3 circulate as the chain 2 moves.

  The carriage moving mechanism 15 is disposed so as to face the second direction, and the carriage 1 is stretched while transporting the film 1 by gripping both ends of the film 1 in the second direction using the carriage 3. Can do.

  The film 1 is gripped by the carriage 3 at both ends in the second direction at the entrance 8. While the carriage 3 is moving from the entrance 8 toward the exit 9, the carriage 3 continues to grip the end of the film 1. When the carriage 3 reaches the outlet 9, the grip of the film 1 is released, and the film 1 is discharged from the outlet 9. Thereafter, the carriage 3 moves from the outlet 9 toward the inlet 8 without holding the film 1.

  While moving from the inlet 8 toward the outlet 9, the distance P1 between the carriages 3 facing the second direction Y changes. Specifically, in the preheating zone 10, the interval P <b> 1 at the inlet 8 is maintained, and in the stretching zone 11, the interval P <b> 1 increases as it proceeds toward the outlet 9. In the heat treatment zone 12, the interval P1 on the outlet 9 side of the stretching zone 11 is maintained, and in the relaxation zone 13, the interval P1 becomes smaller as it proceeds in the direction of the outlet 9. In the cooling hardening zone 14, the interval P1 on the outlet 9 side of the relaxation zone 13 is maintained.

  By changing the distance P1 between the carts 3 facing in the second direction Y, the film 1 is stretched and relaxed. In the relaxation zone 13, the film 1 is relaxed in two directions by moving the carriage 3 while reducing the interval between the neighboring carriages 3.

  Here, the relaxation processing mechanism for relaxing the film 1 in two directions will be described in detail.

Example 1
FIG. 2 is a cross-sectional view of one of the pair of carriages 3 facing the second direction Y of the transverse stretching machine shown in FIG. FIG. 3 is a cross-sectional view of the cart 3 and its peripheral mechanism shown in FIG. 2 is a cross-sectional view taken along the plane BB shown in FIG.
The state shown in FIGS. 2 and 3 is when the interval between the carts 3 adjacent to each other in the traveling direction has the maximum cart interval P2.

  In the description of this document, the traveling direction of the carriage 3 is referred to as a carriage traveling direction Q, and the direction parallel to the surface of the film 1 (FIG. 1) and perpendicular to the carriage traveling direction Q is referred to as a thickness direction R.

  As shown in FIGS. 2 and 3, a guide rail 18 that guides the carriage 3 along the chain 2 is laid. The carriage 3 includes a clamp 4 for gripping the film 1 and a support roller 20 that abuts on an upper surface 19 located on the upper side in the vertical direction of the surface of the guide rail 18. The support roller 20 supports the weight of the carriage 3.

  The carriage 3 moves while slidingly contacting the first surface 21 located on the opposite side to the film 1 among the side surfaces of the guide rail 18 facing the thickness direction R.

  A chain 2 is provided on the side of the carriage 3 closer to the film 1 than the guide rail 18. The chain 2 is formed by connecting a plurality of chain links (outer link 5a, inner link 5b) in series via hinges (fixed hinge 6a, moving hinge 6b). Each chain link is rotatable about a hinge as a rotation axis. That is, the chain can be bent at each hinge.

  The chain link includes an outer link 5a connected to both axial ends of the hinge, and an inner link 5b connected to the hinge on the inner side of the hinge in the axial direction than the outer link 5a. The outer link 5a and the inner link 5b are alternately connected to form a chain 2.

  The hinge includes a fixed hinge 6 a fixed to each carriage 3 and a moving hinge 6 b not fixed to the carriage 3. In the present embodiment, one fixed hinge 6 a is provided for one carriage 3, and the fixed hinge 6 a and the moving hinge 6 b are alternately arranged on the chain 2. By moving the moving hinge 6b in the thickness direction R, the chain 2 is bent, and the distance between adjacent carts 3 along the cart traveling direction Q varies.

  The moving hinge 6b is provided with a second roller (hereinafter referred to as an adjusting roller 22) for adjusting the position of the moving hinge 6b so as to be rotatable around its central axis. In the present embodiment, the rotation shaft of the adjustment roller 22 is a moving hinge 6 b, and the adjustment roller 22 is provided so as to be movable with respect to the carriage 3. The adjustment roller 22 is provided so as to abut on the second surface 23 of the guide rail 18 opposite to the first surface 21.

  The carriage 3 is provided with a first roller (hereinafter referred to as a guide roller 24) that contacts the first surface 21. The guide roller 24 is provided so as to be rotatable around its central axis, and the carriage 3 can move smoothly along the first surface 21 of the guide rail 18 even when the carriage 3 is pulled toward the film 1.

  Further, the guide rail 18 includes portions where the distance between the first surface 21 and the second surface 23 (hereinafter referred to as guide rail thickness t) is different. 2 and 3 are a plan view and a cross-sectional view of the carriage 3 and its peripheral mechanism at a position where the guide rail thickness t is the smallest guide rail thickness t1. The outer diameter of the adjusting roller 22 is designed to be equal to the distance C in the thickness direction R between the center of the fixed hinge 6a and the second surface 23 at the position where the guide rail 18 has the guide rail thickness t1. ing.

  The guide rail 18 is formed by laminating a plurality of plate-shaped base rails 25 in the thickness direction R. As shown in FIG. 1, in the transverse stretching machine, the carriage 3 moves so as to draw a curve between the inlet 8 and the outlet 9. That is, the guide rail 18 shown in FIGS. 2 and 3 is also bent along the path of the carriage 3. By laminating a plurality of base rails 25 to form the guide rail 18 having the rail thickness t1, the processing of the guide rail 18 can be performed more than when the guide rail 18 having the rail thickness t1 is formed by the single base rail 25. Sexuality is enhanced. As a result, the guide rail 18 can be easily laid along the desired route of the carriage 3.

  In the case where the distance from the inlet 8 to the outlet 9 shown in FIG. 1 is long and the inlet 8 and the outlet 9 cannot be laid by one guide rail 18, a plurality of guide rails using joint members (not shown) are used. 18 may be connected to the cart traveling direction Q.

  Further, as shown in FIG. 4, a part of the guide rail 18 in the carriage traveling direction Q has a place where a laminated body 27 in which a plurality of plate members 26 are laminated between the base rails 25 is inserted. 4A is a plan view of the guide rail 18 at a position where the laminated body 27 is inserted between the base rails 25, and FIG. 4B is one plate member of the laminated body 27 shown in FIG. 4A. It is the figure which expanded and showed the characteristic part of 26. In the present embodiment, the guide rail thickness t is changed at the position in the cart traveling direction Q by inserting the laminated body 27 between the base rails 25.

  In the example shown in FIG. 4, the guide rail thickness t is gradually changed from the guide rail thickness t1 when the laminated body 27 is not inserted to the guide rail thickness t2 when the laminated body 27 is inserted. . This is realized by gradually increasing the thickness of the stacked body 27 in the carriage traveling direction Q. You may change the thickness of the laminated body 27 by increasing the number of the board members 26 in steps. By providing the taper 28 on the end surface of the plate member 26 in the carriage traveling direction Q, the guide rail thickness t can be changed more smoothly (FIG. 4B).

  FIG. 5 is a plan view showing another embodiment of the guide rail 18. As shown in FIG. 5, the guide rail thickness t is changed by providing a laminated body 27 in which the plate member 26 is laminated on one surface of the surfaces of the base rail 25 facing the thickness direction R. . In the structure of the guide rail 18 shown in FIG. 5, the base rail 25 can be used as a single layer.

  When the laminated body 27 is provided on the base rail 25, as shown in FIG. 6, the laminated body 27 may be provided only in a region where the adjustment roller 22 abuts. FIG. 6 is a cross-sectional view of the guide rail 18 provided with the laminated body 27 taken along a plane perpendicular to the carriage traveling direction Q (DD plane shown in FIG. 5). By providing the laminated body 27 only in the region where the adjustment roller 22 abuts, the material cost of the guide rail 18 can be reduced.

  Further, by providing the laminated body 27 only on the second surface 23 (FIG. 2 or 3), the route of the carriage 3 is set by the base rail 25, and the guide rail thickness t is adjusted by the laminated body 27. Can do.

  The guide rail 18 is not limited to the example shown in FIG. 4 or FIG. 5, and the first surface 21 and the second surface 23 may be configured so that the guide rail thickness t is different. Specifically, the first surface 21 is configured as a flat surface as a reference surface on which the carriage 3 travels, and the second surface 23 is inclined with respect to the first surface 21 or is a curved surface. It only has to be configured. Of course, the guide rail may be comprised from one member.

  Next, operation | movement of the trolley | bogie movement mechanism 15 in this embodiment is demonstrated.

  As shown in FIG. 2, when the drive sprocket 16 (FIG. 1) is operated, tension F is generated in each chain link, and the carriage 3 moves. At the position of the guide rail 18 having the guide rail thickness t1, the line connecting the hinges is parallel to the guide rail 18, and the distance between the adjacent carts 3 along the guide rail 18 is the maximum cart distance P2. The sum of the lengths of the outer link 5a and the inner link 5b is the maximum carriage interval P2.

  Thereafter, the carriage 3 moves to the position of the guide rail 18 having the guide rail thickness t2. FIG. 7 is a cross-sectional view of the carriage 3 and its peripheral mechanism at the position where the guide rail thickness t is t2, as viewed from above. FIG. 8 is a cross-sectional view of the cart 3 and its peripheral mechanism when the cart 3 and its peripheral mechanism shown in FIG. 7 are cut along a plane (EE plane shown in FIG. 7) perpendicular to the cart traveling direction Q. . 7 is a cross-sectional view taken along the GG plane shown in FIG.

  Since the fixed hinge 6a is fixed to the carriage 3, as shown in FIG. 7, the distance C in the thickness direction R between the center of the fixed hinge 6a and the second surface 23 is the guide rail from the state shown in FIG. The thickness is decreased by the increase in thickness t, that is, by t2-t1. The distance in the thickness direction R between the center of the moving hinge 6b and the second surface 23 does not change from the state shown in FIG. 2 because the adjustment roller 22 is in contact with the second surface 23.

  Therefore, the outer link 5a and the inner link 5b rotate in a direction away from the second surface 23 around the fixed hinge 6a. When the lengths of the outer link 5a and the inner link 5b are the same, the outer link 5a and the inner link 5b are inclined by an angle α from the state of the outer link 5a and the inner link 5b shown in FIG. The angle α is determined from the length L of the outer link 5a and the inner link 5b.

Represented as:

  The distance in the cart traveling direction Q between the adjacent fixed hinge 6a and moving hinge 6b is shortened to cos α times from the state shown in FIG. As a result, the interval between adjacent carts 3 becomes the minimum cart interval P3, and the relaxation length PP to be shortened is

It is expressed.

  For example, if the maximum carriage interval P2 is 127 mm and the guide rail thicknesses t1 and t2 are 8 mm and 27.8 mm, the angle α is about 18.2 degrees and the relaxation length PP is about 6.3 mm. The relaxation rate obtained by dividing the relaxation length PP by the maximum carriage interval P2 is about 5%.

  The rail thickness t2 for obtaining a desired relaxation rate can also be calculated using the equations shown in Equations 1 and 2. Of course, even when the lengths of the outer link 5a and the inner link 5b are different, the rail thickness t2 for obtaining a desired relaxation rate can be calculated by the same calculation.

  The distance C decreases as the guide rail thickness t increases. In order to avoid contact between the second surface 23 and the chain 2, the fixed hinge 6 a is provided on the carriage 3 in advance away from the second surface 23. What is necessary is just to design the outer diameter of the adjustment roller 22 according to the position of the fixed hinge 6a.

  FIG. 9 is a schematic view showing a change in the guide rail thickness t in the relaxation zone 13 (FIG. 1). FIG. 9A shows an example in which the guide rail thickness t is increased in proportion to the travel distance of the carriage 3 when the guide rail thickness t is changed from t1 to t2. FIG. 9B shows an example in which the guide rail thickness t is changed in two steps from t1 to t1 ′ and t2, and the relaxation rate changes in steps in the same manner.

  FIG. 9C shows a change in the guide rail thickness t for changing the relaxation rate in proportion to the travel distance of the carriage 3. Since the relaxation rate is proportional to the cosine of the angle α (FIG. 7), the change in the relaxation rate is small in the region where the angle α is small. Therefore, the change in the guide rail thickness t is increased at the initial stage of increasing the guide rail thickness t, and the change in the guide rail thickness t is gradually reduced.

  In the present embodiment, the guide rail thickness t can be easily changed, that is, the relaxation pattern can be easily changed. As shown in FIGS. 3 and 8, the guide rail 18 is fixed to the rail frame 30 using bolts 29. Therefore, the guide rail thickness t can be changed by removing the bolts 29 and changing the number of the plate members 26 or changing the thickness of the laminated body 27.

  The same can be done for the guide rail 18 shown in FIG. That is, the laminated body 27 is attached to the base rail 25 using the Sarah bolt 31. When changing the guide rail thickness t, the bolts 31 may be removed to increase or decrease the number of plate members 26.

  There is an advantage that the guide rail thickness t can be changed without removing the bolt 29 for fixing the base rail 25 to the rail frame 30. Further, by using the laminated body 27 divided only at the position where the adjusting roller 22 abuts, the size and weight of the laminated body 27 are reduced, and the laminated body 27 can be easily handled.

  The bolts 29 for fixing the guide rails 18 shown in FIGS. 3 and 6 protrude from the surface of the guide rails 18 but are fixed so as not to protrude from the surface of the guide rails 18 using Sarah bolts or thin head bolts. It is good as a method. Since the bolt 29 does not protrude from the surface of the guide rail 18, the contact between the chain 2 and the bolt 29 can be prevented.

  The plate member 26 may be a length that is easy to handle, for example, about 1 m. Moreover, when connecting the guide rail 18 with a joint member, it is better to change the guide rail thickness t within a range where the joint member is avoided.

  Next, the load applied to the adjustment roller 22 will be described.

  As shown in FIG. 7, when the guide rail thickness t increases, the outer link 5a and the inner link 5b rotate around the fixed hinge 6a. As a result, the tension F1 of the outer link 5a and the inner link 5b increases as the angle α increases,

become. In the moving hinge 6b, the tension F1 is divided into a force F parallel to the carriage traveling direction Q and a force F2 parallel to the thickness direction R. As a result, the force F2 is tan α times the basic chain tension F.

  Since one outer hinge 5a and one inner link 5b are connected to each moving hinge 6b, a force twice as large as the force F2 is generated in each moving hinge 6b. As shown in FIG. 8, when two adjustment rollers 22 are provided for one moving hinge 6b, the same load as the force F2 is generated in one adjustment roller 22.

  When the chain tension F is 1000 kg and the angle α is 18.2 degrees, the load received by each adjusting roller 22 is about 329 kg.

  As shown in FIG. 7, two guide rollers 24 are provided on one carriage 3 along the guide rail 18, and the distance P4 between the centers of adjacent guide rollers 24 along the guide rail 18 is the maximum. It is designed to be larger than half of the carriage interval P2. Thereby, the force applied from the guide roller 24 to the guide rail 18 can be easily canceled by the force applied from the adjustment roller 22 to the guide rail 18, and the guide rail 18 can be prevented from bending.

  The carriage 3 may be provided with a plurality of guide rollers 24. As the guide roller 24, a roller having a strength corresponding to the force F2 is used.

  In the present embodiment, the outer diameter of the adjustment roller 22 is larger than the outer diameter of the guide roller 24. Since the number of the guide rollers 24 is twice that of the adjustment rollers 22, the load applied to the guide rollers 24 is half that of the adjustment rollers 22. Increasing the size of the adjusting roller 22 increases the load capacity, which can contribute to extending the life of the adjusting roller 22.

  The load applied to each adjustment roller 22 may be reduced by providing two or more adjustment rollers 22 on one moving hinge 6b.

  Further, in the relaxation zone 13 and the cooling and hardening zone 14 shown in FIG. 1, the cart 3 is hardly pulled by the film 1, but the adjustment roller 22 pulls the cart 3 toward the film 1 when the chain 2 is pulled. Force is generated. Naturally, the carriage 3 can move along the guide rail 18 by the guide roller 24 and the adjustment roller 22.

  According to the present embodiment, the adjustment roller 22 can be moved in the thickness direction R by changing the guide rail thickness t. As a result, it is not necessary to separately provide a rail for adjusting the position of the adjustment roller 22, and it can be formed with a simple structure with a small number of components.

(Example 2)
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a cross-sectional view of the cart 3 and its peripheral mechanism in the second embodiment when viewed from above.

  As shown in FIG. 10, in this embodiment, two moving hinges 6b are provided between adjacent fixed hinges 6a, and an adjustment roller 22 is provided on each moving hinge 6b. That is, the two adjustment rollers 22 are provided between the adjacent fixed hinges 6a. By increasing the number of adjusting rollers 22, the force applied to each adjusting roller 22 can be reduced.

  The chain link connecting the moving hinge 6b and the moving hinge 6b is constituted by an outer link type or inner link type parallel link 5c. The positions of the outer links 5a and the inner links 5b of the outer links 5a and the inner links 5b that are rotatably provided on the fixed hinges 6a of the respective carts 3 are changed for each of the adjacent carts 3. Correspondingly, the outer link type parallel link 5c and the inner link type parallel link 5c of the chain link for connecting the moving hinge 6b and the moving hinge 6b are interchanged for each carriage 3.

  When the maximum carriage interval P2, the guide rail thicknesses t1 and t2 are the same as in the first embodiment, and the lengths of the chain links are equal, the angle α at which the relaxation rate is 5% is It will be 22.4 degrees.

  Assuming that the tension F of the chain 2 is 1000 kg, the force F2 parallel to the thickness direction R at each moving hinge 6b is 412 kg. In other words, the adjustment roller 22 per unit is 206 kg. Therefore, compared with the force 329 kg of the adjustment roller 22 per one in the first embodiment, the load on the adjustment roller 22 in the present embodiment is reduced, and the life of the adjustment roller 22 can be extended.

  Moreover, in the parallel link 5c shown in FIG. 10, the arrangement may be a link (referred to as an outer / outer link) provided outside the outer link 5a in the hinge axis direction.

  FIG. 11 is a diagram when the parallel link 5c is applied as an outer / outer link, and the carriage shown in FIG. 10 and its peripheral mechanism are cut along a plane perpendicular to the thickness direction R (HH plane shown in FIG. 10). It corresponds to a cross-sectional view at that time. As shown in FIG. 11, as a link arrangement, the parallel link 5c (outer / outer link) + moving hinge 6b + outer link 5a + fixed hinge 6a + inner link 5b + moving hinge 6b + parallel link 5c (outer / outer link) +. It becomes. According to this arrangement, since one set of carriages can be configured with the same link arrangement, the length of the chain 2 can be easily changed for each set of carriages.

  In the example shown in FIG. 10, the parallel link 5c may be formed as an offset link in which one end is arranged like the inner link 5b and the other end is arranged like the outer link 5a. Can be configured with the same link arrangement.

(Example 3)
Next, a third embodiment will be described with reference to FIG. FIG. 12 is a cross-sectional view of the cart 3 and its peripheral mechanism in the third embodiment when viewed from above.

  As shown in FIG. 12, in the third embodiment, two moving hinges 6b are provided between adjacent fixed hinges 6a, as in the second embodiment. A protrusion 32 is provided from the moving hinge 6b toward the guide rail 18, and an adjustment roller 22 is provided at the end of the protrusion 32 on the guide rail 18 side.

  The adjustment roller 22 is provided on the protruding portion 32 via a shaft 33. That is, the adjustment roller 22 can rotate around the shaft 33. The protrusion 32 is integrally formed with one of the two chain links (the outer link 5a and the inner link 5b) connected to the moving hinge 6b, and may be formed in an L shape, for example.

  By providing the adjustment roller 22 at the end of the protruding portion 32, it is possible to ensure the distance C between the center of the fixed hinge 6 a and the second surface 23 of the guide rail 18 even if the outer diameter of the adjustment roller 22 is small. It becomes. By making the protrusion 32 longer, contact between the chain 2 and the guide rail 18 can be prevented even if the change in the guide rail thickness t is further increased.

  Further, by making the chain link L-shaped, when the chain link is tilted, the distance P5 between the fixed hinge 6a and the shaft 33 in the traveling direction of the carriage 3 is the distance between the fixed hinge 6a and the base of the protruding portion 32. It becomes larger than the distance P6.

  If the relaxation rate is 5% in the third embodiment, the angle α = 22.4 degrees under the condition that the lengths of the chain links are equal. Further, since the distance P5 and the distance P6 are about 50 mm and 39 mm, the force F2 parallel to the thickness direction R applied to the adjustment roller 22 when the tension F of the chain 2 is 1000 kg is 1 of the adjustment roller 22 in this embodiment. It will be about 160kg per piece. That is, it is possible to make the load smaller than 206 kg per adjustment roller 22 in the second embodiment.

  In the configuration of the present embodiment, the same effects as in FIGS. 2 and 3 can be obtained, the load applied to the adjustment roller 22 is small, and the life of the adjustment roller 22 can be extended.

  In addition, the angle α of the chain link in the present invention is preferably 0 to 30 degrees. This is because the relaxation rate of the film relaxation processing mechanism is generally 5%, and the purpose can be satisfied if the angle α is 30 degrees. On the other hand, when the angle α exceeds 30 degrees, the load on the adjusting roller and the guide roller is increased and the life is shortened. However, in the case of a thin film, since the load applied to the adjusting roller and the guide roller is small, it can be used even if the angle α is 30 degrees or more.

DESCRIPTION OF SYMBOLS 1 Film 2 Chain 3 Cart 5a Outer link 5b Inner link 6a Fixed hinge 6b Moving hinge 13 Relaxation zone 18 Guide rail 21 First surface 22 Adjustment roller 23 Second surface 24 Guide roller

Claims (13)

A carriage that grips and moves the edge of the film;
A guide rail that has a first surface and a second surface located on the opposite side of the first surface, and guides the cart while the first surface and the moving cart are in sliding contact with each other. When,
A plurality of the carts connected to each other at intervals in the traveling direction of the cart, and a chain provided to be able to bend;
In the film relaxation processing mechanism for relaxing the film held by the carriage in the traveling direction of the carriage by bending the chain,
A first roller provided on the carriage and rotating while abutting against the first surface of the guide rail;
A second roller that is provided on the chain without being fixed to the carriage and that rotates while contacting the second surface of the guide rail;
The film relaxation processing mechanism, wherein the guide rail has a portion in which the distance between the first surface and the second surface is different. The guide rail includes a pair of opposing base rails that respectively form the first surface and the second surface, and a laminate in which a plurality of plate members are stacked between the pair of base rails. ,
The film relaxation processing mechanism according to claim 1, wherein the thickness of the laminated body changes stepwise along the traveling direction of the carriage.   The end face of the plate member in the traveling direction of the carriage has a taper, and the distance between the first surface and the second surface changes smoothly. 2. A relaxation treatment mechanism for a film according to 1.   The first surface is a flat surface as a reference surface on which the carriage travels, and the second surface is inclined with respect to the first surface or a curved surface. The film relaxation processing mechanism according to claim 1, wherein the interval is different depending on the type.   The guide rail is a base rail having the first surface and a stacked body in which a plurality of plate members are stacked, and the stacked body is fixed to the base rail so as to form the second surface; The film relaxation processing mechanism according to claim 1, wherein the thickness of the laminated body changes along the traveling direction of the carriage.   6. The film relaxation processing mechanism according to claim 5, wherein the laminated body is provided only in a region of the second surface where the second roller contacts.   Each of the carriages includes a plurality of the first rollers along the traveling direction of the carriage, and the distance between the centers of the first guide rollers adjacent to each other in the traveling direction of the carriage is adjacent to the carriage. The film relaxation processing mechanism according to any one of claims 1 to 6, wherein the film relaxation processing mechanism is larger than half of the interval.   The film relaxation processing mechanism according to claim 7, wherein an outer diameter of the second roller is larger than an outer diameter of the first roller.   9. The film relaxation process according to claim 1, wherein a plurality of the second rollers are arranged between adjacent carts along a traveling direction of the cart. 9. mechanism The chain is formed by connecting a plurality of chain links in series via a hinge,
The chain link includes an outer link connected to both axial ends of the hinge, an inner link connected to the hinge inside the hinge in an axial direction from the outer link, and the hinge from the outer link. The film relaxation processing mechanism according to claim 1, further comprising an outer / outer link connected to the hinge on an outer side in an axial direction.   11. The film according to claim 1, wherein the second roller is provided in a protrusion provided to protrude from the chain toward the guide rail. Relaxation processing mechanism. Provided with a fixed hinge for fixing the chain to the carriage,
The distance between the fixed hinge and the center of the second roller in the traveling direction of the carriage is longer than the distance between the fixed hinge and the base of the protrusion in the traveling direction of the carriage. The film relaxation processing mechanism according to claim 11. A pair of the film relaxation processing mechanisms according to any one of claims 1 to 12, and the pair of guide rails are provided so as to face each other in a direction intersecting a traveling direction of the carriage,
As the carriage moves in the traveling direction, the distance between the first surfaces of the opposing guide rails is reduced and the distance between the first surface and the second surface of each of the guide rails is increased. A transverse stretching machine having a relaxation zone.

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