TW201922454A - Biaxial stretching machine for sheet-like material capable of freely setting longitudinal and transverse stretching ratios of a sheet-like material with a simple structure - Google Patents

Abstract

The present invention provides a biaxial stretching machine for sheet-like material capable of freely setting longitudinal and transverse stretching ratios of a sheet-like material with a simple structure while fixing an outlet width of the sheet-like material to a predetermined value. The present invention is provided with a moving mechanism 30 for moving guide rails 15, 16 disposed in an inlet side area 5 in a TD direction, and the guide rails 15 and 16 disposed in an extended region 6 are configured by the slit rails. The present invention is further provided with a moving mechanism 36 for moving the guide rails 15, 16 disposed in the extended region 6 formed by the slit rails in the TD direction. The slit rails are configured in such a way that a gap between the opposite outer peripheral side rails 15 (inlet width W1) is set to be variable, a gap between the opposite outer peripheral side rails 15 at the outlet side region 7 (outlet width W2) is set to be fixed, so as to form slits in the vertical direction at intervals along the longitudinal direction.

Description

   Sheet Biaxial Extender   

The present invention relates to a stretcher for extending a sheet, such as a thermoplastic resin film, and more particularly to a biaxial stretcher for simultaneously extending a sheet in a vertical and horizontal direction.

This biaxial stretching machine is equipped with a ring link device, and returns to the inlet side along both sides of the sheet from the entrance side where the sheet is introduced through the exit side where the sheet is sent out. The closed path formed on a substantially horizontal plane is provided with outer guide rails and inner guide rails, and the guides of these outer guide rails and inner guide rails are used to make a plurality of equal-length links along the closed path. By moving, the sheet is conveyed from the inlet side to the exit side, while moving in the longitudinal direction (MD direction) along the conveyance direction of the sheet and the widthwise direction of the sheet at a right angle to the longitudinal direction (TD (Direction) simultaneously extended and sent out from the exit side, wherein the ring-shaped link device is a plurality of equal-length links formed in a folding rule shape by a gripping device having a side end portion for holding a sheet-like object. The devices are connected in a ring shape (see Patent Document 1).

In the conventional biaxial stretching machine, there are existing peripheral rails and guides for guiding a plurality of equal-length link devices in order to change the lateral stretching magnification (hereinafter referred to as "TD magnification") of the sheet. A component in which the entire inner peripheral side guide rail moves in parallel in the lateral direction. However, in this case, if the TD magnification is changed, the width of the sheet after the stretching process will change. Therefore, the inlet width of the equipment on the downstream side of the simultaneous biaxial stretcher must be changed. As the variable width mechanism is used as the downstream equipment, there is a problem that the equipment cost is increased. In addition, if the TD magnification is changed, the raw material width of the sheet before stretching is changed from the equipment on the upstream side of the simultaneous biaxial stretching machine. Therefore, it is necessary to have an outlet width variable mechanism for upstream. Therefore, there is a problem that equipment costs are incurred. TD magnification = (exit width W2) / (entrance width W1); here, entry width W1: variable or fixed; exit width W2: variable.

On the other hand, in the conventional TD ratio variable method of a horizontal stretcher or a part of a biaxial stretcher, there is a fixed entrance width of a sheet. However, in this case, if the TD magnification is increased, compared with the case where the inlet width of the sheet is variable corresponding to the width of the raw material, the width of the extended exit side of the sheet must be widened and configured. There is a problem that a large-scale variable angle mechanism having a large variable angle outside the peripheral guide rail and the inner peripheral side guide in the area where the extension is performed may cause a large manufacturing cost.

On the other hand, in the conventional biaxial stretching machine, it is proposed that the inlet width of the sheet is variable and the TD magnification of the sheet is variable (see Patent Document 2).

However, in the conventional biaxial stretching machine for a sheet-like object in Patent Document 2, although the stretching ratio of the sheet-like object in the vertical and horizontal directions can be arbitrarily set, the exit width of the sheet-like object, that is, the sheet extended in the longitudinal and horizontal directions However, the width of the object changes in accordance with the stretching ratio in the vertical and horizontal directions, hindering subsequent steps, and there is a problem that the yield of the material is low.

    [Prior technical literature]         [Patent Literature]    

[Patent Document 1] Japanese Patent No. 4379306

[Patent Document 2] Japanese Patent No. 4802919

In view of the problems with the conventional biaxial stretching machine for sheet-like objects, the present invention aims to provide a simple structure that can arbitrarily set the stretch ratio of the sheet-shaped object in the vertical and horizontal directions, and at the same time, the exit width of the sheet-like object can be set. A biaxial extension machine that fixes a sheet to a predetermined value.

In order to achieve the above object, the biaxial stretching machine of the sheet of the present invention is configured as a biaxial stretching machine having a sheet, and is configured with a ring link device, and is provided on both sides of the sheet. , Along the closed path formed on the substantially horizontal plane from the inlet side where the sheet is introduced through the outlet side where the sheet is sent out to the inlet side, an outer peripheral side guide and an inner peripheral side guide are provided and used The outer peripheral side guide and the inner peripheral side guide guide a plurality of equal-length link devices along the closed path, thereby moving the sheet from the entrance side toward the exit side, while moving toward the exit side. Those who extend from the exit side after extending simultaneously along the longitudinal direction of the conveyance direction of the sheet and the widthwise direction of the sheet at a right angle to the longitudinal direction, wherein the annular link device is provided with a holding piece The above-mentioned plurality of equal-length connecting rod devices formed in the shape of a folding rule at the side end of the object are connected in a ring shape. The biaxial extension machine of such a sheet is characterized in that: It has: entrance side area It is arranged in parallel on both sides of the sheet to face the outer peripheral side guide rail and the inner peripheral side guide rail, and a distance between the outer peripheral side rail and the inner peripheral side rail is arranged at a first distance interval; an extension area, It is connected to the entrance-side area, and the outer-side guide rail and the inner-side guide rail are arranged in a diffused manner toward the end toward the conveying direction of the sheet; and the exit-side area is connected to the extension area and is arranged in parallel. There is an outer peripheral side guide and an inner peripheral side guide facing the two sides of the sheet, and the interval between the outer peripheral side guide and the inner peripheral side guide is arranged at a second distance interval; The movement mechanism of the outer-peripheral guide and the inner-peripheral guide moving laterally along the width direction of the sheet changes the interval between the opposing outer-peripheral guides and makes the exit-side region opposite The gap between the outer peripheral side guide rails is fixed, and the slit rails forming vertical slits are spaced apart from each other along the longitudinal direction of the guide rails to constitute the outer peripheral side rails and the inner periphery. Side guide and set to make Slits formed rail moving means disposed on the outside circumference side of the extension region and the inner peripheral side guide rail toward the sheet in the width direction of the lateral movement of.

In this case, the outer rails and the inner rails arranged outside the above-mentioned extension area can be laid on a plurality of divided rail abutments, and the adjacent rail abutments can be horizontally connected to each other by a rotary joint. The inner part is swingably connected, and a moving mechanism for moving the rotary joint part in a widthwise direction along the width direction of the sheet is provided, and the interval between the opposed outer peripheral side guide rails is variable.

In addition, the outer rail and the inner rail provided in the extension region can be used as a curved rail that is curved in a horizontal plane when there is no load.

According to the biaxial stretching machine of the sheet of the present invention, since the peripheral guide rails and the inner peripheral guide rails are arranged outside the extended area, the slits in the vertical direction are formed at intervals along the longitudinal direction of the guide rail. It is composed of rails and is provided with a moving mechanism that moves the slit rail laterally along the width direction of the sheet. Therefore, the change of the stretching magnification corresponding to the longitudinal and lateral directions of the sheet is provided in the extension area. The outer guide rail and the inner guide rail formed by the slit rail are moved laterally by the moving mechanism, and their directions are changed by bending the portion where the slit is formed, so that the corresponding changes can be made. The stretching action of the sheet in the aspect ratio in the aspect ratio. In addition, since the interval (= exit width) between the outer peripheral side rails facing the exit-side area is fixed, the sheet is sent out from the exit side in a state where the sheet is fixed to a predetermined exit width. Therefore, the exit width of the sheet can be fixed to a predetermined value while the extension ratio of the sheet in the vertical and horizontal directions can be set arbitrarily with a simple structure.

In addition, the outer rails and the inner rails arranged on the outer extending area are laid on a plurality of divided rail bases, and adjacent rail bases can be swung in a horizontal plane by a rotary joint portion. It can be connected by ground, and a moving mechanism that moves the rotary joint part in the lateral direction along the width direction of the sheet is provided, and the interval between the opposed outer peripheral side guide rails can be changed, so that it can be easily constructed. In order to reduce the thickness, the installation space of the rotary joint can be suppressed.

In addition, by arranging the outer-side guide rail and the inner-side guide rail in the extension region, a curved track that is curved in the horizontal plane when no load is used can make the outer-peripheral side of the extension region through which the isometric link device passes. The shapes of the guide rail and the inner peripheral side guide rail are close to the ideal curve of the ideal extending action on the sheet.

1‧‧‧Double Axis Extension Machine

2‧‧‧ flakes

3‧‧‧ transport space

4‧‧‧ ring link device

5‧‧‧ entrance side area

6‧‧‧ extended area

7‧‧‧ exit side area

10‧‧‧ Holding device

11‧‧‧ Isometric link device

12, 13‧‧‧ sprocket

15‧‧‧ (outer peripheral side)

15a, 15A‧‧‧ outer peripheral side guide

15b‧‧‧ outer rail side joint

16‧‧‧ (inner peripheral side)

16a, 16A‧‧‧Inner peripheral side guide part

16b‧‧‧Inner peripheral side rail joint

18, 19‧‧‧ connecting rod shaft for joint

20, 21‧‧‧ connecting rod plate

22, 23‧‧‧bearing

22a, 23a‧‧‧bearing roller

24, 24a, 24b, 25, 25a, 25b ‧‧‧ flanged radial bearings

26‧‧‧chain link

27a, 27b, 28a, 28b ‧‧‧ a pair of rotating bodies (rotary motion cam mechanism)

30‧‧‧ Mobile agency

31‧‧‧ connector body

32‧‧‧ slit

33‧‧‧ Orbital abutment

35‧‧‧Swivel joint

36‧‧‧ Mobile agency

40‧‧‧ Pivot

41‧‧‧ connector base

42‧‧‧Swing plate

42a‧‧‧Inner arc-shaped peripheral surface

42b‧‧‧outer arc-shaped peripheral surface

42c‧‧‧face

43‧‧‧ plumb axis

44‧‧‧ Centerline between tracks

45‧‧‧ Bolt

46‧‧‧ round hole

46a‧‧‧round bottom

46b‧‧‧Circular wall surface

47‧‧‧ the first outer arc-shaped peripheral surface

48‧‧‧ 2nd outer arc-shaped peripheral surface

49‧‧‧arc stepped surface

50‧‧‧ flange

51‧‧‧Press plate

51a‧‧‧Concave curved surface

52‧‧‧ Stop

61‧‧‧TD Direction Slide

62‧‧‧bearing

63‧‧‧Screw shaft

64‧‧‧nut member

65‧‧‧Guide members

66‧‧‧Guide and press member

D1‧‧‧The first distance interval

D2‧‧‧The second distance interval

P1, P2‧‧‧Pitch

W1‧‧‧ entrance width

W2‧‧‧ exit width

Fig. 1 is a plan view showing an embodiment of a biaxial stretching machine for sheet-like objects according to the present invention.

FIG. 2 is a view schematically showing a main part of a guide rail of the biaxial extension machine.

Fig. 3 is a cross-sectional view of an equal-length link device of the biaxial extension machine.

Fig. 4 is an explanatory diagram showing the operation of a radial bearing of the equal-length link device of the biaxial extension machine.

Fig. 5 (a) and (b) are explanatory diagrams of a variable method of MD magnification of the biaxial stretching machine.

Fig. 6 is a plan view showing the guide rails in the extension area of the biaxial extension machine, Fig. 6 (a) is a state diagram of the guide rails before buckling, and Fig. 6 (b) is a state diagram of the guide rails' buckling states.

FIG. 7 is a structural explanatory diagram of a track joint portion of a guide rail of the biaxial extension machine.

Fig. 8 is a perspective view showing a part of the periphery of a rotary joint used in the biaxial extension machine in an exploded state.

Fig. 9 shows a rotary joint portion used in the biaxial extension machine, Fig. 9 (a) is a plan view, and Fig. 9 (b) is a sectional view taken along the line A-A of Fig. 9 (a).

FIG. 10 is a perspective view showing a moving mechanism of an extension area of the biaxial extension machine.

FIG. 11 is a plan view showing an example of a guide rail constituting an extension area of the biaxial extension machine using a curved track.

Next, an embodiment of the biaxial stretching machine of the sheet-like object of the present invention will be described with reference to the drawings.

    <Outline description of extension machine>    

The biaxial stretching machine 1 for a sheet-like object shown in FIG. 1 includes a conveying space 3 for conveying a sheet-like object 2 made of, for example, a thermoplastic resin or the like, which is an object to be stretched, so that the central part faces the front-back direction ( FIG. 1 is provided in a left-right direction) extension mode; and a pair of ring-shaped link devices 4 (omitting a part of the link in FIG. 1 and a ring-shaped link on one side) is arranged to sandwich the conveying space 3 It is arranged on both sides of the transfer space 3. In this biaxial stretching machine 1, the entrance-side area (preheating area) 5, the extension area 6, and the exit-side area (heat-fixing area) 7 are divided and set in such a manner that they are connected in order toward the conveying direction of the sheet 2. .

The ring-shaped link device 4 is formed by a plurality of equal-length link devices 11 formed in a folding rule shape and provided with a gripping device 10 that holds a side end portion of the sheet-like object 2. A plurality of equal-length link devices 11 connected in a ring shape are engaged with sprocket wheels 12 and 13 required at predetermined positions on the entrance side and the exit side of the sheet 2 arranged in the transport space 3. . In addition, a plurality of equal-length link devices 11 are arranged along a closed path formed along a substantially horizontal plane from the inlet side of the introduction sheet 2 through the outlet side of the sheet 2 to the inlet side and back to the inlet side. The outer peripheral side rail 15 and the inner peripheral side rail 16 are provided. Hereinafter, if there is no particular need to distinguish between the outer-peripheral-side guide rail 15 and the inner-peripheral-side guide rail 16 and describe them, they are simply referred to collectively as "rails 15, 16".

The annular link device 4 is driven by a sprocket 12 on the inlet side. Then, the grasping device 10 is opened and closed by opening and closing means (not shown) such as an opening and closing guide provided on the entrance side, and grasps the sheet 2 so that it is in the preheating area (the entrance side area) 5 It is heated to the temperature required for stretching. In addition, the annular link device 4 is guided by the guide rails 15 and 16 which are arranged in the traveling direction in a divergent manner in the extension area 6 so that the gripping distance is gradually expanded from P1 to P2. The longitudinal direction (MD direction) of the conveying direction of the object 2 and the transverse direction (TD direction) along the width direction of the sheet 2 at right angles to the longitudinal direction extend the sheet 2 at the same time. The fixed area (exit side area) 7 is thermally fixed at a predetermined temperature, and a cooling area (not shown) is provided for quenching if necessary, and an opening and closing means (not shown) such as an opening and closing guide provided at the exit side is provided. (Shown), the gripping device 10 is opened and closed to release the sheet 2, and the released sheet 2 is directly advanced. The ring link device 4 is configured to be driven by the exit-side sprocket 13 and return to the entrance-side sprocket 12.

In addition, as the link mechanism of the ring link device 4, reference may be made to the ring link device described in Japanese Patent Publication No. 5-4896.

As shown in FIG. 3, each of the outer-peripheral-side guide rail 15 and the inner-peripheral-side guide rail 16 is configured by a beam-shaped member having a convex shape and a substantially rectangular cross section. A link shaft 18 for a joint that connects the holding device 10 holding the sheet 2 is disposed near the outer-side guide rail 15 near the sheet 2, and an inner joint-side guide 16 is provided for a joint without the holding device 10. Link shaft 19. The link shaft 18 and the link shaft 19 are connected by a link plate 20 and a link plate 21. To the lower ends of the connecting rod shafts 18 and 19, bearing housings 22 and 23 having bearing rollers 22a and 23a as first rolling bearings are connected, and on both sides of the bearing housings 22 and 23, that is, the outer periphery of the bearing rollers 22a and 23a. The flanged radial bearings 24 [24a, 24b] and 25 [25a, 25b] are mounted as a pair of second rolling bearings. The flanged radial bearings 24 and 25 are configured to roll on both sides of the guide rails 15 and 16 that guide the movement of the isometric link device 11 and use the upper surfaces of the guide rails 15 and 16 and the flanged radial direction. The flanges of the bearings 24 and 25 are in contact with each other to maintain the dead weight of the isometric link device 11. Furthermore, the links 26 that limit the maximum pitch of the equal-length link device 11 are provided between adjacent link shafts 19.

As shown in FIG. 4, in the equal-length link device 11, the intersection angle (θ) between the link plate 20 and the guide rail 16 is different between θ1 and θ2 in a closed state and an open state of the link. That is, at this time, the flanged radial bearings 24 [24a, 24b], 25 [25a, 25b] supported by the bearing seats 22, 23, and the connecting rod shafts 18, 19 are also supported by the bearing rollers 22a, 23a. The function (rotation) always changes (rotates) in such a way that it is substantially perpendicular to both sides of the guide rails 15 and 16, that is, orthogonal to the long side directions of the guide rails 15 and 16. As shown in Figs. 5 (a) and (b), even if the cross angles θ5, θ61, and θ62 between the link plates 20, 21 and the guide rails 15, 16 change according to the opening and closing of the folding rule-shaped link, it has a convex shape. The radial bearings 24 [24a, 24b], 25 [25a, 25b] of the edge also rotate (rotate) by the action of the bearing rollers 22a, 23a, and always rotate in a manner perpendicular to the two sides of the guide rails 15, 16. The equal-length link device 11 can be guided by the guide rails 15 and 16 to perform high-speed movement.

Next, in the annular link device 4 configured as described above, the longitudinal extension ratio of the sheet-like object 2 in the extension region is referred to in FIGS. 5 (a) and 5 (b) (hereinafter, referred to as "MD ratio"). The variable method (fix one side of the guide rails 15 and 16 (in this case, fix the guide rail 15 on the holding device 10 side), and move the other side to make the equal-length link device 11 A moving mechanism with a variable opening angle will be described.

FIG. 5 shows the state of the extended portion when the widthwise stretching magnification (hereinafter referred to as “TD magnification”) of the sheet-like object in the stretching area is set to 1.0, and FIG. 5 (a) shows a state where the MD magnification is 1.0. 5 (b) shows a state where the MD magnification is greater than 1.

A pair of rotating bodies (rotary motion cam mechanisms) 27a, 27b, 28a, and 28b that spirally change in radius are used to sandwich both sides of the inner peripheral side guide rail 16 for movement. For example, as shown in FIG. 5 (b), The rotating bodies 27a and 27b are maintained in the initial state, and the rotating body 28a is rotated 180 degrees clockwise and the rotating body 28b is rotated 180 degrees counterclockwise, thereby moving the right side of the inner peripheral side guide 16 as shown in the figure. It moves so that it may approach the outer peripheral side guide rail 15, and the opening angle of the connecting rod of the isometric link device 11 becomes large. Thereby, the MD magnification of the sheet 2 can be increased (the gripping device is omitted in the figure).

By combining the above-mentioned stepless variable technology of MD magnification and the stepless variable technology of TD magnification (a technique in which the guide rails 15 and 16 are arranged divergently), the MD magnification can be freely set. And TD magnification.

In this embodiment, an example of a rotating body using a rotary cam mechanism as a mechanism for changing the width between the guide rails 15 and 16 has been shown, but it is not limited to these, and the guide rail 15 may be used. , 16 Machining the female thread and screwing the shaft provided with the male thread, and rotating the shaft, so as to move the guide rail.

    <Explanation of the guide rails etc. installed in the entrance side area>    

As shown in FIG. 2, in the entrance-side area 5, the outer-peripheral-side guide 15 and the inner-peripheral-side guide 16 are opposite to each other on both sides of the sheet 2, and are arranged in parallel and the outer-peripheral-side guide 15 and the inner-peripheral side The interval between the guide rails 16 is a first distance interval D1. A moving mechanism 30 is provided in the entrance-side region 5 to move the outer-side guide rail 15 and the inner-side guide rail 16 arranged in the entrance-side region 5 in the TD direction, and the moving outer mechanism 30 can change the opposite outer periphery. The interval between the side rails 15 (= entrance width W1). Here, although the detailed description of the moving mechanism 30 is omitted, for example, a screw linear motion mechanism may be mentioned, and a structure may be adopted in which it is provided with a track base which is provided to use linear motion Guided by the guide, it can move back and forth in the TD direction, and supports are arranged on the outer side guide rail 15 and the inner side guide rail 16 of the entrance-side area 5; The lower part of the abutment extends in the TD direction; the orbital abutment and the screw shaft are connected by a nut member screwed to the screw shaft, and the screw shaft is rotated forward or reverse by the action of the motor, thereby The outer-peripheral-side guide rail 15 and the inner-peripheral-side guide rail 16 arranged in the entrance-side area 5 are moved back and forth in the TD direction.

    <Explanation of the guide rail etc. installed in the extension area>    

The outer peripheral side guide rail 15 and the inner peripheral side guide rail 16 which are arranged in the extension region 6 connected to the entrance side region 5 are each composed of a slit rail. The slit rail is a linear rail extending in a straight line, and the required buckling portions are formed at intervals along the longitudinal direction of the rail (equivalent to the outer peripheral side rail joint portion 15b and the inner peripheral side rail joint portion 16b described later). In addition, as will be described later, the buckling portion is formed by forming a required slit extending in the vertical direction on the side of the rail.

6 (a), the peripheral guide rails 15 arranged outside the extended area 6 are configured to include a plurality of linear guide rail portions 15a, which are arranged intermittently. In the longitudinal direction, and the outer peripheral side rail joint portion 15b is disposed so as to connect one of the adjacent outer peripheral side rail portions 15a and the other outer peripheral side rail portion 15a. Similarly, the inner-peripheral-side guide rails 16 arranged in the extension area 6 are configured to include: a plurality of linear inner-peripheral-side guide rail portions 16 a arranged intermittently in the longitudinal direction; and The inner peripheral side rail joint portion 16b is disposed so as to connect one of the adjacent inner peripheral side rail portions 16a and the other inner peripheral side rail portion 16a.

As shown in FIG. 7, the outer peripheral side rail joint portion 15 b and the inner peripheral side rail joint portion 16 b are located on both sides of the rail-shaped joint body 31 and narrow a plurality of vertical directions at intervals along the longitudinal direction thereof. The slit 32 is provided in a zigzag shape, and is configured to be bendable and deformable in the TD direction, and to expand and contract in the moving direction of the equal-length link device 11.

As shown in FIG. 6 (a), the outer peripheral side rail joint portion 15b and the inner peripheral side rail joint portion 16b adjacent to each other along the TD direction are used as a reference, and one of the reference sides is adjacent to each other along the TD direction. Both the outer peripheral side rail portion 15a and the inner peripheral side rail portion 16a are laid on the rail base 33 on one side, and the outer peripheral side rail portion 15a and the inner peripheral side are adjacent to each other in the lateral direction on the other side of the reference. Both of the rail portions 16a are laid on the rail base 33 on the other side.

The rail abutment 33 on one side and the rail abutment 33 on the other side are connected to each other in a swingable manner in a horizontal plane by a rotary joint portion 35, and are extended as shown in FIGS. 8 and 10. The area 6 is provided with a moving mechanism 36 (see FIG. 2) that moves the rotary joint portion 35 in the TD direction.

    <Explanation of the rotary joint part>    

As shown in FIG. 8, the rotary joint portion 35 is mainly composed of a joint base 41 including a pivot shaft 40 and a pair of swing plates 42. Here, the pivot shaft 40 has a vertical axis 43 which is located between the rail abutment 33 on one side and the rail abutment 33 on the other side adjacent to each other, and passes through the outer peripheral side guide 15 It is orthogonal to the center-to-track center line 44 at the intermediate position of the inner peripheral side guide 16. In addition, the rail abutments 33 adjacent to each other are placed on a pair of swinging plates 42, respectively, and both are fastened by a required bolt 45.

As shown in FIGS. 9 (a) and 9 (b), the joint base 41 is a base supporting an abutment portion of the rail abutment 33 on one side and the rail abutment 33 on the other side. A rectangular plate-shaped member having a plate surface on the upper and lower sides. A circular bottom surface 46 a and a circumferential wall surface 46 b standing upright along the outer periphery of the circular bottom surface 46 a are formed on the side plate surface above the joint base 41. A circular hole 46 having a bottom circular shape, and a pivot shaft 40 is erected at the center of the circular bottom 46a of the circular hole 46.

The pair of swinging plates 42 are arranged to face each other with the pivot shaft 40 sandwiched in the circular hole 46 of the joint base 41 in a state in which the pair of swinging plates 42 face the plate surface in an up-and-down direction. The circular bottom surface 46a of the circular hole 46 of the joint base 41 is contacted. On the other hand, the upper side surface of each swing plate 42 is higher than the upper surface of the joint base 41 from the joint base 41. The circular hole 46 protrudes.

Each of the swinging plates 42 is composed of a plate-like member that is substantially fan-shaped (center angle less than 180 °) in plan view. The plate-like member has a center of curvature (the center of the pivot 40) on the vertical axis 43 as The inner arc-shaped peripheral surface 42a and the outer arc-shaped peripheral surface 42b, which are arranged at intervals in the radial direction, and a pair of end surfaces 42c which connect both ends of the arc-shaped peripheral surfaces 42a and 42b to each other. Surrounded by. The inner arc-shaped peripheral surface 42 a has a center of curvature on the vertical axis 43, and is formed on the center corner side of each of the swing plates 42 so as to face each other in contact with the outer peripheral surface of the pivot shaft 40. The outer arc-shaped peripheral surface 42 b includes a first outer arc-shaped peripheral surface 47 and a second outer arc-shaped peripheral surface 48. The first outer circular arc-shaped peripheral surface 47 has a center of curvature on the vertical axis 43 and is disposed at a height position protruding from the circular hole 46 of the joint base 41 so as to be higher than the inner circular arc-shaped peripheral surface 42a. A first predetermined curvature radius having a sufficiently large curvature radius is formed on the arc side of each of the swing plates 42. The second outer arc-shaped peripheral surface 48 has a center of curvature on the vertical axis 43 and is opposed to the first outer arc in a state of being in contact with the peripheral wall surface 46 b of the circular hole 46 of the joint base 41. The first predetermined radius of curvature of the perimeter surface 47 having a larger second predetermined radius of curvature is formed on the arc side of each of the swing plates 42. In this way, when each of the swinging plates 42 swings about the pivot shaft 40, the inner arc-shaped peripheral surface 42a of each swing plate 42 engages with the outer peripheral surface of the pivot shaft 40, and the second outer arc-shaped shape of each swing plate 42 The peripheral surface 48 is engaged with the peripheral wall surface 46b of the circular hole 46 of the joint base 41, and can guide the swinging motion of each swing plate 42, and the adjacent rail bases 33 can smoothly lead around the lead of the pivot 40 The vertical axis 43 rotates.

At the boundary between the first outer arc-shaped peripheral surface 47 and the second outer arc-shaped peripheral surface 48, a radius from the first outer arc-shaped peripheral surface 47 toward the second outer side with the vertical axis 43 as a reference is provided. The arc-shaped peripheral surface 48 is continuously formed by an arc-shaped stepped surface 49 formed by continuous arcs. In each of the swing plates 42, the flange portion 50 is formed by a lower side plate surface of the swing plate 42, a second outer arc-shaped peripheral surface 48, and an arc-shaped stepped surface 49.

The pair of pressing plates 51 are attached to the joint base 41 so as to face the pair of swinging plates 42 so as to face each other with the pivot shaft 40 interposed therebetween. Each pressing plate 51 has an end portion that overlaps with the flange portion 50 of each swing plate 42 in a plan view, and a predetermined predetermined distance from the first outer arc-shaped peripheral surface 47 of the swing plate 42 is formed at the front end portion. The arc-shaped concave curved surface 51a facing each other in the gap state. In this way, without interfering with the swinging motion of each swinging plate 42, when each swinging plate 42 rises, the front end portion of each pressing plate 51 abuts against the arc-shaped stepped surface 49 of the flange portion 50 of each swinging plate 42, thereby preventing When each of the swing plates 42 rises.

Among the pair of wobble plates 42, one of the pair of end faces 42 c of one side of the wobble plate 42 is near the corner portion that intersects the first outer arc-shaped peripheral surface 47 and one of the pair of end faces 42 c of the other side of the wobble plate 42. A stopper 52 is mounted near the corner portion intersecting the first outer arc-shaped peripheral surface 47 so as to face each other in a direction around the vertical axis 43. When each of the swing plates 42 is intended to surround the vertical axis 43 When the swing is more than a predetermined angle, each of the swing plates 42 is pressed against each other by the stoppers 52 facing each other in the direction around the vertical axis 43 and does not swing further. In this way, the rotation angles of the adjacent rail bases 33 about the vertical axis 43 can be limited to a predetermined range, so that the outer rail 15 and the inner rail 16 can be prevented from being damaged due to excessive bending.

    <Explanation of the moving mechanism in the extended area>    

As shown in FIGS. 8 and 10, the moving mechanism 36 that moves the rotary joint portion 35 in the TD direction includes a TD direction slide 61 provided with a joint base 41 of the rotary joint portion 35 and facing the TD. Freely move back and forth in directions; and the screw shaft 63, which extends below the TD direction slide 61 toward the TD direction, and its important parts are supported by bearings 62; and the TD direction slide 61 and the screw shaft 63 are connected with The nut member 64 screwed with the screw shaft 63 is connected, and the screw shaft 63 is rotated forward or reverse by the operation of a motor (not shown), thereby the rotary joint portion 35 can be reciprocated in the TD direction through the TD direction slide 61. mobile.

The guide member 65 extending in the MD direction is mounted on the TD direction slide 61 so as to be in sliding contact with one side edge portion of the joint base 41, and is attached to the other side edge portion formed on the joint base 41 A guide and pressing member 66 that engages with the attached portion and guides the joint base 41 in a direction of MD so as not to raise it. By the guide member 65 and the guide and pressing member 66, the joint base 41 can be stored in such a manner that the joint base 41 does not move relative to the TD direction slide 61 in the TD direction. In addition, by the guidance and pressing of the guide member 65 and the guide and pressing member 66, the joint base 41 can be relatively moved in the MD direction without being raised relative to the TD direction slide 61, so that Movement in the MD direction of the rotary joint portion 35 caused by the thermal expansion of the track base 33 or the deviation of the rotation angle of the track base 33 may be allowed.

    <Explanation of guide rails etc. arranged in the exit side area>    

As shown in FIG. 2, in the exit-side region 7, the outer-peripheral-side guide 15 and the inner-peripheral-side guide 16 are opposed to each other on both sides of the sheet 2, and are arranged in parallel with the outer-peripheral-side guide 15 and the inner-peripheral-side guide. The interval of 16 becomes the second distance interval D2. For example, the interval (= exit width W2) between the outer peripheral side rails 15 opposite to the outer peripheral side rail 15 on both sides of the sheet 2 is fixedly provided in the exit-side area 7 '. fixed.

In the biaxial stretching machine 1 described above, the outer peripheral side guide 15 and the inner peripheral side guide are constituted by the slit rails arranged in the extension area 6 in accordance with the change in the stretching ratio of the sheet 2 in the vertical and horizontal directions. 16. The moving mechanism 36 is moved in the TD direction. Thereby, as shown in FIG. 6 (b), the outer rail 15 and the inner rail 16 are bent at portions of the outer rail joint 15b and the inner rail joint 16b, respectively, so that the outer rail 15 and the inner rail The direction of the peripheral side rail 16 is changed, and the extending action of the sheet 2 corresponding to the changed magnification of the vertical and horizontal directions is performed. As shown in FIG. 2, since the interval (= exit width W2) between the outer peripheral side rails 15 facing the exit area 7 is fixed, the sheet 2 is fixed to a predetermined exit width W2. It is sent out from the exit side. Therefore, the exit width W2 of the sheet 2 can be fixed to a predetermined value while the extension ratio of the sheet 2 can be set arbitrarily in a simple configuration. TD magnification = (exit width W2) / (entrance width W1); here, entry width W1: variable; exit width W2: fixed.

As shown in FIG. 10, the outer-side guide rails 15 and the inner-side guide rails 16 arranged on the extension area 6 are laid on the divided rail bases 33, and the adjacent rail bases 33 are adjacent to each other. The rotary joint portion 35 is swingably connected in the horizontal plane, and a moving mechanism 36 is provided to move the rotary joint portion 35 in the TD direction. The interval between the opposed outer peripheral guide rails 15 is variable. Thereby, a simple structure can be achieved and thickness reduction can be achieved, and the installation space of the rotary joint part 35 can be suppressed.

As mentioned above, although the biaxial stretching machine of the sheet-like object of this invention was demonstrated based on one embodiment, this invention is not limited to the structure described in the said embodiment, It can change suitably within the range which does not deviate from the meaning. Its composition.

In the above-mentioned embodiment, the outer peripheral side rail 15 and the inner peripheral side rail 16 are disposed in a divergent manner in the extension area 6, and a linear rail extending linearly is used to separate them along the longitudinal direction of the rail. An example of a slit rail in which vertical slits are formed at intervals, but it is not limited to this. As shown in FIG. 11, a curved rail having a shape that bends in a horizontal plane when no load is applied may be used. The outer circumferential side guide rail 15A and the inner circumferential side guide rail 16A are formed by a slit track in which a slit in the vertical direction is formed at intervals in the longitudinal direction of the track. Thereby, the shape of the outer peripheral side guide rail 15A and the inner peripheral side guide rail 16A of the extension area 6 through which the equal-length link device 11 passes can be made close to the ideal curve of performing the ideal extension operation on the sheet 2.

In the embodiment described above, it has been shown that the slit rails in which vertical slits are formed at intervals along the longitudinal direction of the guide rails constitute the guide rails 15 and the inner periphery arranged on the outer peripheral side of the extension region 6. The example of the side rail 16 is not limited to this, and it may be configured by forming a slit rail with slits inclined at a predetermined acute angle with respect to the vertical direction at intervals along the longitudinal direction of the rail. In addition, the slits provided in the slit rail are arranged alternately in a zigzag manner on both sides of the rail. As a method of the zigzag arrangement, the slits in the same direction may be alternately applied in a plurality of units. Configuration.

    (Industrial availability)    

The biaxial stretching machine of the sheet of the present invention has a characteristic that the width of the sheet can be fixed to a predetermined value while the extension ratio of the sheet in the vertical and horizontal directions can be set arbitrarily with a simple structure. For example, it can be preferably used for applications in which a sheet-like material such as a thermoplastic resin film is stretched vertically and horizontally, and has large industrial applicability.

Claims (3)

    A biaxial stretching machine for a sheet is provided with a ring-shaped link device, and on both sides of the sheet, along the exit side from which the sheet is introduced from the entrance side where the sheet is introduced Then return to the closed path formed on the substantially horizontal plane of the inlet side, and arrange the outer-side guide and the inner-side guide, and use the guides of the outer-side and inner-side guides to make a plurality of equal-length links The device moves along the closed path, thereby moving the sheet from the inlet side to the outlet side, while moving the sheet in the longitudinal direction along the conveyance direction of the sheet and the sheet at a right angle to the longitudinal direction. Those who extend from the exit side after extending in the widthwise direction at the same time, wherein the ring-shaped link device is a plurality of the above-mentioned plurality of folding rulers formed by a gripping device having a side end portion holding a sheet-like object. The equal-length link device is connected in a ring shape; such a biaxial extension machine of the sheet is characterized in that it has: an entrance-side area, which is arranged in parallel on both sides of the sheet Opposite outer peripheral side guide and inner periphery The guide rails are arranged at a first distance interval between the outer guide rail and the inner guide rail; the extension area is connected to the entrance side area, and the outer guide rail and the inner guide rail are oriented toward the conveying direction of the sheet It is arranged to be diffused toward the end; and an exit-side area is connected to the extension area, and is arranged in parallel with the outer-peripheral-side guide rail and the inner-peripheral-side rail opposite to the two sides of the sheet, and the second The distance between the outer peripheral side guide rail and the inner peripheral side guide rail; the moving mechanism for moving the peripheral guide rail and the inner peripheral guide rail arranged outside the entrance side area in the widthwise direction of the sheet, The interval between the opposite outer peripheral guide rails is variable, and the interval between the opposite outer peripheral guide rails in the exit-side area is fixed so that lead is formed at intervals along the longitudinal direction of the guide rails. The slit rail of the vertical slit constitutes a peripheral rail and an inner peripheral rail disposed outside the above-mentioned extension region, and is provided with the slit rail composed of the slit rail and an outer peripheral rail and Inner peripheral side guide Sheet in the width direction of the lateral movement of the moving mechanism.         For example, the biaxial stretching machine for sheet-like objects according to claim 1, wherein the outer rails and the inner rails arranged on the outer extension area are laid on a plurality of divided rail abutments, and a rotary joint is used. The adjacent rail abutments are connected to each other in a horizontal plane in a swingable manner, and a moving mechanism for moving the rotary joint portion in a lateral direction along the width direction of the sheet is provided. The interval is set to be variable.         For example, the biaxial stretching machine for the sheet-shaped article of claim 1 or 2, wherein the outer side guide rail and the inner side guide rail are arranged outside the above-mentioned extension area, and a curved track that is curved in a horizontal plane when no load is used.