JPH10337773A - Device for stretching film laterally and tenter clip running guide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To retain the flexed configuration of a steel plate rail close to an arc configuration by disposing a curve deformable rail connecting body between a first rigid portion and a second rigid portion, and connecting this connecting body in a fixed state at one end and slidable in a direction in which the steel rail extends at the other end thereof. SOLUTION: A curve deformable steel rail connecting body 53 is disposed between a first rigid body portion 50 and a second rigid body portion 51. When a first receiving table 45 is rotated around a rotating shaft 48 relative to a second receiving table 46, the rail connecting body 53 between the first ridig body 50 and the second rigid body 51 is curved along a sectorial arc configuration in conjunction with the rotating movement of the first receiving table 45. When this occurs, the rail connecting body 53 slides in a running direction relative to the first rigid portion 50 while it is being curved in the arc-like configuration. This results in the stable high-speed running of a tenter clip and smooth expanding movement of the steel plate rail.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film stretching machine for stretching a film such as a plastic film in the transverse direction (perpendicular to the film feeding direction), and a tenter clip traveling guide device.

[0002]

2. Description of the Related Art In general, as a transverse stretching machine for a film, for example, a tenter clip system disclosed in Japanese Utility Model Laid-Open No. 59-107219 is known. The transverse stretching machine includes a plurality of pairs of left and right tenter clips that respectively grip both sides of the film, a pair of left and right guide rails that guide the traveling of each tenter clip, and a driving drive for each tenter clip along the guide rail. And a chain drive type clip driving device.

Here, the left and right guide rails are disposed between an entrance side guide portion and an exit side guide portion of the film traveling path, and the distance between the two guide rails is gradually increased along the film traveling direction. A laterally extending guide portion that expands and a return guide portion for returning the tenter clip from the exit side guide portion to the entrance side guide portion are provided.

[0004] The clip drive device is provided with left and right drive units respectively corresponding to the left and right guide rails. In addition, each drive unit has an inlet sprocket arranged on the entrance side of the film traveling path, an exit sprocket arranged on the exit side, and an endless chain bridged between both the entrance and exit sprockets. A certain roller chain is provided.

[0005] The clip body of each tenter clip is mounted with bearings that roll along guide rails and roller chain components such as rollers and link plates.

[0006] When the film stretching machine is driven, the tenter clips are driven by the left and right drive units of the clip drive device, and are circulated along the left and right guide rails. At this time, with each tenter clip gripping and clamping both sides of the film by each tenter clip at the entrance side of the film traveling path, the film is moved in the horizontal direction as each tenter clip travels on the horizontal stretching guide portion of the guide rail. It is designed to be stretched.

A long guide rail is generally formed by connecting a plurality of rail members in series along the running direction of a film. Here, the laterally extending guide portions of the left and right guide rails are disposed so as to be bent at a predetermined set angle with respect to the extending direction of the linear portion of the entrance side guide portion.

The bent portion between the linear portion of the entrance side guide portion of each of the left and right guide rails and the laterally extending guide portion is configured as follows. That is, the portion of the lateral extension guide portion of the guide rail is fixed on the first cradle,
The linear portion of the entrance-side guide is fixed on the second cradle. Further, the first receiving stand and the second receiving stand are connected so as to be rotatable around a rotation axis.

The main portion of the laterally extending guide portion on the first cradle and the main portion of the linear portion of the entrance-side guide portion on the second cradle are each formed of a highly rigid, for example, cast rail. I have.

[0010] Further, between the edge of the main portion in the laterally extending guide portion on the first cradle and the edge of the main portion in the linear portion of the entrance side guide portion on the second cradle. Are isolated for a predetermined time. The two edge portions are relatively easily bent and are connected to each other by, for example, a steel plate rail which can be bent and deformed. In this case, one end of either the front end or the rear end of the steel plate rail is fixed to the casting rail, and the other end is slidably connected to the casting rail.

By rotating the first receiving base with respect to the second receiving base about the rotation axis, the bending of the laterally extending guide portion with respect to the extending direction of the linear portion of the entrance-side guide portion. The angle is set to a predetermined angle. At this time, the steel plate rail between the edge portion of the laterally extending guide portion and the edge portion of the linear portion of the entrance side guide portion is curved and deformed into a substantially circular arc shape, and the entrance side guide portion and the laterally extending guide portion are curved. Each of the linear portions is continuously and smoothly connected via an arc-shaped steel plate rail.

[0012]

In the above-mentioned conventional construction, the curved shape of the steel plate rail, which is curved and deformed into a substantially arc shape when the laterally extending guide portion is bent at a predetermined set angle, is exceptional. The fact is that it is not regulated. Therefore, in particular, when the bending angle of the lateral stretching guide portion is large and high bending, the arc becomes a large angle arc, and when the film is stretched in the horizontal direction with the traveling of each tenter clip traveling on this guide rail, When a film stretching force is applied to the steel plate rail from the tenter clip, there is a problem that the steel plate rail is deformed. As a result, the traveling of each tenter clip traveling on the guide rail becomes unstable, and the traveling of each tenter clip may not be performed smoothly, and thus there is a problem in increasing the speed of the horizontal stretching operation of the film. .

Further, when the horizontal stretching guide portion bent to a high bending angle is restored, the frictional force increases, and the steel plate rail of the horizontal stretching guide portion may not be smoothly contracted. In this case, in an extreme case, there is a possibility that the steel sheet rail of the horizontal stretching guide portion may be damaged at the time of returning the horizontal stretching guide portion bent to a high bending angle to the original state.

[0014] By temporarily supporting the central portion of the steel plate rail of the transverse stretching guide in some way, the deformation of the steel plate rail due to the film stretching force acting on the steel plate rail from each tenter clip is reduced, and the bending of the steel plate rail is reduced. It can be imagined that the steel plate rail can be expanded and contracted smoothly when adjusting the angle. However, since the mounting position of the steel plate rail of the horizontal stretching guide portion to the casting rail changes according to the change in the bending angle of the steel plate rail, the center portion of the steel plate rail is simply supported by the casting rail of the horizontal stretching guide portion. It is difficult to do that.

The present invention has been made in view of the above circumstances, and an object of the present invention is to maintain a bent shape of a steel plate rail near an ideal arc shape in a state in which a transverse stretching guide portion is bent at a high stretching angle. A horizontal stretching machine for film and its tenter clip running, which is hard to be deformed by stretching force, and can stabilize and speed up the running of the tenter clip and smoothen the expansion and contraction of the steel rail when the bending angle of the steel rail changes. To provide a guidance device.

[0016]

According to the first aspect of the present invention, there are provided a plurality of left and right pairs of clips for gripping both sides of the film, and a pair of right and left guide rails for guiding the running of the clips. A roller that rolls along the guide rails is mounted on the main body, and an expanding portion that gradually expands the interval between the two guide rails along the running direction of the film is formed on the guide rails,
In a state in which both sides of the film are gripped by the clips, the film is stretched in the horizontal direction with the running of the clips running on the expanding portion of the guide rail. A rotation shaft is centered between a first cradle for receiving the portion of the expanded portion of the guide rail and a second cradle for receiving a portion on the upstream side in the running direction of the film with respect to the expanded portion. A substantially linear first rigid body portion constituting a main portion of the expanding portion fixed on the first receiving base; and a second receiving portion. A gap portion for adjusting a bending angle is provided between the main portion of the upstream portion fixed to the table and a substantially linear second rigid body portion that constitutes a main portion of the upstream portion,
A rail connection body that can be bent and deformed is disposed between the first rigid portion and the second rigid portion, one end of the rail connection body is fixed, and the other end is the direction in which the guide rail extends. And the center portion of the curved portion in the rail connection body is always held near a stable ideal position when the first receiving base is bent with respect to the second receiving base. A horizontal stretching machine for a film, comprising rail holding means.

According to the first aspect of the present invention, the first cradle is rotated about the rotation axis with respect to the second cradle, and the bending angle of the expanded portion of the first cradle changes. In this case, the center portion of the curved portion of the rail coupling body is always held near a stable ideal position where deformation is small by the rail holding means.

According to a second aspect of the present invention, the rail holding means comprises:
A projecting portion projecting toward the inward direction of a bent portion between the first cradle and the second cradle on the first cradle and the second cradle, respectively; An intermediate arm having an outer end connected to a center portion of the curved portion in the rail connection body, a rotation fulcrum provided at an inner end of the intermediate arm, and disposed near the shaft support, One end is rotatably connected to each protruding portion of the second receiving stand,
2. The film according to claim 1, wherein the other end is formed by a link mechanism having first and second link arms rotatably connected to the rotation fulcrum. It is a horizontal stretching machine. According to the second aspect of the present invention, when the first cradle is rotated about the rotation axis with respect to the second cradle, and the bending angle of the expanding portion of the first cradle changes. By holding the central portion of the curved portion of the rail coupling body by the outer end of the intermediate arm of the link mechanism, the arc shape of the curved portion of the rail coupling body is maintained substantially near the ideal shape.

According to a third aspect of the present invention, in the film stretching apparatus according to the first aspect of the present invention, the rail connection member is formed by a metal plate overlapping portion in which a plurality of metal plates are stacked. It is. According to the third aspect of the present invention, by providing the rail connecting member composed of the metal plate overlapping portion, the rail connecting member is easily bent and deformed when the first receiving stand and the second receiving stand are bent. The curved shape of the body is made smooth.

According to a fourth aspect of the present invention, there is provided a pair of left and right guide rails for guiding the running of a plurality of pairs of right and left clips respectively gripping both sides of the film, and the distance between the two guide rails is set along the running direction of the film. An expanding portion that gradually expands is formed on the guide rail, and the clip moves on the expanding portion of the guide rail in a state where both sides of the film are gripped by the clip. In a tenter clip traveling guide device for a transverse stretching machine for stretching a film in a transverse direction, a first receiving stand for receiving a portion of the expanding portion of the guide rail, A shaft support portion is provided for rotatably supporting a portion on the upstream side in the traveling direction and a second support that is rotatable about a rotation shaft, and is provided on the first support. A substantially linear first rigid portion constituting a main portion of the enlarged portion to be defined, and a substantially linear first rigid portion constituting a main portion of the upstream portion fixed on the second cradle. A gap portion for adjusting a bending angle is provided between the first rigid portion and the second rigid portion, and a rail joint that can be bent and deformed is disposed between the first rigid portion and the second rigid portion; When the one end side of the body is connected in a fixed state, the other end side is slidably connected in the extending direction of the guide rail, and the first receiving base is bent with respect to the second receiving base. A tenter clip travel guide device for a film horizontal stretching device, comprising a rail holding means for always holding a center portion of a curved portion in a rail joint near a stable ideal position. According to the fourth aspect of the present invention, when the first cradle is rotated about the rotation axis with respect to the second cradle, and the bending angle of the expanding portion of the first cradle changes. The center holding portion of the curved portion in the rail connecting member is always held near a stable ideal position where deformation is small with rail holding means.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration of an entire film manufacturing apparatus 1 for biaxially stretching a plastic film. The film manufacturing apparatus 1 is provided with various devices such as a T-die 2, a cast roll 3, a vertical stretching machine 4, a horizontal stretching machine 5, a take-up unit 6, and a winding machine 7.
Then, the molten resin discharged from the T-die 2 is formed into a sheet by the cast roll 3 to form an original sheet,
Further, after the raw sheet is longitudinally stretched by the longitudinal stretching machine 4,
The film is transversely stretched by the transverse stretching machine 5, passed through the take-up unit 6, and wound up by the winder 7.

The film stretching machine 5 of the present embodiment has a tenter clip 8 shown in FIGS. 2A and 2B which grips both sides of the film and stretches the film in the lateral direction.
A guide rail 9 in two rows on the left and right shown in FIG. 3 for guiding the traveling of the tenter clip 8 is provided.

Further, the tenter clip 8 is provided with a clip body 10 for holding a film and a drive chain 11. Here, as shown in FIG. 2A, a pair of left and right lever supports 13 is protruded from the clip main body 10 above the clip table 12.

A support shaft 14 is provided between the pair of lever supports 13. A clip lever 15 is rotatably supported on the support shaft 14. Then, the clip lever 15 clips the film at the clip position shown in FIG. 2B, and releases the clip of the film while being rotated clockwise in FIG. Has become.

A chain box 16 of the drive chain 11 is provided below the clip table 12. Connecting pins 1 are provided on both upper and lower walls of the chain box 16.
Upper and lower ends of 7 are respectively fixed.

Further, a roller 18 and link plates 19 above and below the roller 18 are provided in the chain box 16.
And are arranged. The two link plates 19 are connected by a cylindrical bush 20. This bush 20 is inserted into the roller 18. Further, a connecting pin 17 is inserted into the bush 20. Thereby, the chain box 16 and the link plate 19
Are connected via a connecting pin 17 to form an endless chain.

The clip body 10 is provided with a plurality of bearings 21 to 26. Further, a bearing support 27 extends from the clip table 12 on the side opposite to the clip lever 15 as shown in FIG. The upper ends of the support shafts 28 and 29 of the two bearings 23 and 24 are fixed to the bearing support 27. The bearing 23 is rotatably supported at the lower end of one support shaft 28, and the bearing 24 is rotatably supported at the lower end of the other support shaft 29.

Further, as shown in FIG. 2 (B), the other two bearings 2
5, 26 support shafts 30 are attached. An upper bearing 25 is rotatably supported at the upper end of the support shaft 30, and a lower bearing 26 is rotatably supported at the lower end.

The support shaft 31 of the bearing 21 is fixed on the bearing support 27. The bearing 21 is rotatably supported at one end of the support shaft 31.

As shown in FIG. 3, a film receiving section 33 for receiving the film 32 longitudinally stretched by the longitudinal stretching machine 4 is provided in the film transport path R in the horizontal stretching machine 5.
Stretching section 34 for transverse stretching the film 3 and the transversely stretched film 3
And a film outlet 35 for feeding the sheet 2 to the take-off unit 6 side.

Further, a pair of left and right tenter clip traveling paths 36 are provided on both sides of the film transport path R, respectively. The idler sprocket 3 of the drive chain 11 of the tenter clip 8 is provided on each tenter clip traveling path 36.
7 and a drive sprocket 38 are provided respectively. Here, the idler sprocket 37 and the drive sprocket 38 of the drive chain 11 are disposed at the film receiving portion 33 and the film outlet portion 35 in the horizontal stretching machine 5, respectively.

The long left and right guide rails 9 of each tenter clip 8 in the horizontal stretching machine 5 are formed by connecting a plurality of rail members in series along the running direction of the film. That is, each of the left and right guide rails 9 has an inlet-side linear guide portion 39 connecting the idler sprocket 37 of the film receiving portion 33 and the laterally extending portion 34, and a laterally extending guide portion 40 provided in the laterally extending portion 34. And the horizontal stretching section 34
An outlet-side linear guide portion 41 connecting between the film outlet portion 35 and the idler sprocket 37;
5 idler sprocket 37 and drive sprocket 38
Between the drive sprocket 38 of the film outlet 35, the drive sprocket 38 of the film receiving unit 33, and the idler sprocket 37. A return guide section 43 is provided. Here, as shown in FIG. 3, the horizontal stretching guide portion 40 has an expanding portion 44 having a stretching angle θ that gradually increases the interval between the left and right guide rails 9 along the running direction of the film 32. I have.

Further, the left and right guide rails 9 of the present embodiment have a first receiving stand 45 for receiving the expanded portion 44 of the guide rail 9 of each laterally extending portion 34 as shown in FIGS. And the film 32 is wider than the expanded portion 44 of the horizontal stretching portion 34.
, A second receiving stand 46 for receiving the inlet-side linear guide portion 39 is provided.

A shaft support 47 is provided between the first receiving base 45 and the second receiving base 46. here,
In the first receiving stand 45, a thin portion 45a having a cutout on the lower surface side in FIG. 4 is formed at the end of the connecting portion side with the second receiving stand 46 in FIG. Further, the second receiving base 46 is formed with a thin-walled portion 46a whose upper surface is cut off in FIG. 4 at an end on the side of the connecting portion with the first receiving base 45.

The thin portion 45a of the first receiving tray 45 and the thin portion 46a of the second receiving tray 46 are overlapped. A rotation shaft 48 is mounted on this overlapping portion.
The lower end of the rotating shaft 48 is fixed on a base frame 49 of the horizontal stretching machine 5. Further, the end of the second receiving table 46 on the thin portion 46 a side is also fixed on the base frame 49. And the first receiving stand 45 is the second receiving stand 4
6 is rotatably supported about a rotation shaft 48.

On the first receiving stand 45, an expanding portion 44 is provided.
A substantially linear first rigid portion 50 constituting a main portion of the first fixed portion is fixed. Further, on the second receiving base 46, a substantially linear second rigid portion 51 constituting a main portion of the entrance side linear guide portion 39 which is an upstream portion of the expanding portion 44 is fixed. Here, the first rigid portion 50 on the first cradle 45 and the second rigid portion 51 on the second cradle 46 are each formed by, for example, a casting rail.

A gap 52 of an appropriate size for adjusting the bending angle is provided between the first rigid portion 50 and the second rigid portion 51. Furthermore, the first rigid part 50
A rail connecting body 53 that can be bent and deformed is disposed between the second rigid body portion 51 and the second rigid body portion 51. As shown in FIGS. 6 and 7, in the present embodiment, the rail connecting body 53 is formed by a metal plate overlapping portion in which four metal plates 54 such as steel plates are stacked.

FIG. 4 shows one end of the rail connector 53.
A plurality of screw insertion holes 55 are formed as shown in FIG.
Then, one end side of the rail connection body 53 is the same as FIG.
As shown in FIG. 3B, in a state of being sandwiched between the holding plate 56 and the second rigid portion 51, it is fixed to the second rigid portion 51 by fixing screws 57 inserted into the screw insertion holes 55. I have.

Further, at the other end of the rail connection member 53, two elongated guide holes 58 are provided extending along the running direction of the film 32 as shown in FIG. As shown in FIGS. 5, 7 and 8A and 8B, a plurality of screw members 60 inserted through the holding plate 59 are provided in these guide holes 58.
Is inserted. The distal ends of these screw members 60 are screwed to the first rigid portion 50. As a result, the other end of the rail connector 53 is connected to the holding plate 59 and the first rigid portion 5.
0. And the rail connection body 53
Is connected to the first rigid portion 50 slidably along the running direction of the film 32 in a state where the screw member 60 is guided along each guide hole 58.

Further, the left and right guide rails 9 of the present embodiment have the rail connecting member 53 when the space between the first receiving base 45 and the second receiving base 46 is bent as shown in FIG. A rail holding means 61 is provided for always holding the center of the curved portion near a stable ideal position where deformation is small.

The rail holding means 61 is provided with a link mechanism 65 having one intermediate arm 62 and two link arms (first and second link arms) 63 and 64. Here, one elongated hole-shaped guide hole 66 extends along the running direction of the film 32 at a substantially central portion (a central portion of the curved portion) of the rail connector 53. The outer end of the intermediate arm 62 of the link mechanism 65 is connected to the guide hole 66 of the rail connector 53.

Further, at the inner end of the intermediate arm 62, there is provided a rotation fulcrum 67 arranged near the shaft support 47. Inner ends of the first and second link arms 63 and 64 are rotatably connected to the rotation fulcrum 67, respectively.

Further, the first receiving base 45 and the second receiving base 46 are provided with projecting portions 68, which protrude inward from the bent portions between the first receiving base 45 and the second receiving base 46. 69 are provided respectively. Here, the outer end of the first link arm 63 is connected to the protruding portion 68 on the first receiving base 45 side so as to be rotatable about a support shaft 70. Further, the outer end of the second link arm 64 is connected to the protruding portion 69 on the second receiving base 46 side so as to be rotatable about the support shaft 71.

The front end of the rail connector 53 has a linear rail structure 72 constituting the entrance-side linear guide portion 39,
The rear end of the rail connector 53 is connected to a linear rail component 73 that constitutes a linear portion of the expanded portion 44 of the horizontal extension guide 40.

Next, the operation of the film transverse stretching machine 5 of the present embodiment having the above configuration will be described. During operation of the horizontal stretching machine 5 of the present embodiment, the drive sprocket 38 of the drive chain 11 of the tenter clip 8 is driven. Each of the tenter clips 8 on each of the tenter clip traveling paths 36 is moved along the guide rail 9 in the horizontal stretching machine 5 by the driving of the driving sprocket 38 so that the entrance side linear guide portion 3 is formed.
9, the circulation drive is sequentially performed between the horizontal extension guide section 40, the exit side linear guide section 41, the expansion / contraction section 42 and the return guide section 43. At this time, the clip lever 15 is moved to the clip position shown in FIG. 2B by the film receiving portion 33 to clip the film 32, and the tenter clips 8 are transferred to the horizontal stretching portion 34 while holding the film 32. Be guided.

Further, in the laterally extending portion 34, each tenter clip 8 is connected to the expanding portion 4 of the laterally extending guide portion 40 of the guide rail 9.
4, the distance between the two tenter clips 8 on both sides of the film 32 gradually increases with the operation of traveling along
As a result, the film 32 is stretched in the horizontal direction.

Further, each tenter clip 8 of the horizontal stretching section 34 is guided to the film exit section 35 along the exit side linear guide section 41 with the laterally stretched film 32 still being clipped. And the film outlet 35
Then, the clip lever 15 of each tenter clip 8 is rotated to the clip release position by a clip release device (not shown), and the clip of the film 32 is released. Therefore, the laterally stretched film 32 is guided to the take-off unit 6 side in the next step, and each of the tenter clips 8 unclipped of the film 32 continues to extend and contract.
And is guided to the return guide 43 side.

Further, in the film horizontal stretching machine 5 of the present embodiment, the first receiving base 45 is rotated about the rotation shaft 48 with respect to the second receiving base 46 so that the horizontal stretching section 34 is rotated.
The expansion angle of the expansion portion 44 is set arbitrarily. here,
As shown in FIG. 8A, from the state where the rotation angle of the first receiving stand 45 is 0 °, the first receiving stand 45 is moved relative to the second receiving stand 46 as shown in FIG. When the rotation is made about the rotation shaft 48, the rail connection body 53 between the first rigid part 50 and the second rigid part 51 is substantially fan-shaped with the rotation of the first receiving stand 45. Curved along the arc shape of.
At this time, in a state where the screw member 60 is guided along each guide hole 58 with the operation of bending the rail connecting body 53 into an arc shape, the rail connecting body 53 is connected to the first rigid portion 5.
It slides along the running direction of the film 32 with respect to 0. As a result, the rail connecting body 53 is curved into a substantially fan-shaped arc shape that smoothly connects the rigid portions 50 and 51 of the first and second receiving stands 45 and 46.

In the present embodiment, the first receiving stand 45
Is rotated about the rotation shaft 48 with respect to the second receiving base 46, and when the space between the first receiving base 45 and the second receiving base 46 is bent, the middle of the link mechanism 65. By the outer end of the arm 62, the central portion of the curved portion in the rail connector 53 is always held near a stable ideal position where deformation is small. Thereby, the position of the center portion of the curved portion at the time of bending deformation of the rail connector 53 is regulated, so that the rail connector 5
The arc shape of the curved portion of No. 3 can be held substantially near the ideal shape.

Therefore, the above configuration has the following effects. In other words, the left and right guide rails 9 of the present embodiment have rail connection members 53 when the space between the first receiving base 45 and the second receiving base 46 is bent as shown in FIG.
Since the link mechanism 65 constituting the rail holding means 61 for always holding the center portion of the curved portion in the vicinity of a stable ideal position with little deformation is provided, the first receiving base 45 and the second
Of the link mechanism 6 when the space between the
5 by means of the outer end of the intermediate arm 62.
The center portion of the curved portion can always be held near a stable ideal position where deformation is small. As a result, the position of the central portion of the curved portion at the time of bending deformation of the rail connector 53 is regulated, so that the arc shape of the curved portion of the rail connector 53 can be maintained substantially near the ideal shape.

Further, at the time of driving in the horizontal stretching machine 5, a stretching force acts on the rail connecting body 53 from each tenter clip 8 with the operation of each tenter clip 8 running on the expanding portion 44 of the horizontal stretching guide portion 40. At this time, since the entire link mechanism 65 can receive the stretching force acting on the rail connector 53 from each tenter clip 8 via the intermediate arm 62, the mechanical strength of the rail connector 53 can be increased. For this reason, even when an extension force acts on the rail connector 53 from each tenter clip 8, it is possible to prevent the rail connector 53 from being significantly deformed, so that the running of the tenter clip 8 is stabilized and the speed is increased. be able to. Further, the expansion / contraction operation when the bending angle of the rail connector 53 as a steel plate rail changes can be made smooth. It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various other modifications can be made without departing from the spirit of the present invention.

[0052]

According to the first and fourth aspects of the present invention, the bending force of the steel sheet rail in a state where the horizontal stretching guide portion is bent at a high stretching angle is maintained close to an ideal arc shape. In addition, the tenter clips can be easily deformed, and the running of the tenter clip can be stabilized, the speed can be increased, and the expansion and contraction operation of the steel plate rail when the bending angle of the steel plate rail changes can be made smooth.

According to the second aspect of the present invention, the first cradle is rotated about the rotation axis with respect to the second cradle, and the bending angle of the expanded portion of the first cradle is changed. In this case, the outer end of the intermediate arm of the link mechanism holds the central portion of the curved portion of the rail coupling body, so that the arc shape of the curved portion of the rail coupling body can be maintained near the ideal shape. is there.

According to the third aspect of the present invention, since the rail connected body of the first aspect is formed by a metal plate overlapping portion in which a plurality of metal plates are overlapped, the first and second pedestals can be separated. There is an effect that the rail coupling body can be easily bent and deformed at the time of bending, so that the curved shape of the rail coupling body can be made smooth.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an entire film manufacturing apparatus in which a horizontal stretching machine for a film according to a first embodiment of the present invention is incorporated.

FIGS. 2A and 2B show a tenter clip used in the horizontal stretching machine of the first embodiment, wherein FIG. 2A is a front view and FIG.

FIG. 3 is a schematic configuration diagram of a guide rail of the horizontal stretching machine according to the first embodiment.

FIG. 4 is a vertical cross-sectional view showing the shaft support portions of the first and second receiving stands of the guide rail of the horizontal stretching machine of the first embodiment.

FIG. 5 is a cross-sectional view showing a link mechanism of rail holding means of the guide rail in the horizontal stretching machine of the first embodiment.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a sectional view taken along line BB of FIG. 5;

FIG. 8A is a cross-sectional view of a main part showing a mounting state of a rail connector of a guide rail of the horizontal stretching machine according to the first embodiment, and FIG. 8B is a side view of a mounting portion of the rail connector. .

[Explanation of symbols]

 Reference Signs List 8 tenter clip 9 guide rail 32 film 39 entrance side linear guide part 40 lateral extension guide part 44 expanding part 45 first receiving base 46 second receiving base 47 shaft support part 48 rotating shaft 50 first rigid body part 51 first 2 Rigid body part 52 Gap part 53 Rail connecting body 54 Metal plate 61 Rail holding means

Claims (4)

[Claims] A plurality of pairs of left and right clips for gripping both sides of the film, and a pair of left and right guide rails for guiding the running of the clips, wherein the main body of the clip is rolled along the guide rails. A moving roller is mounted, and an expanding portion is formed on the guide rail so as to gradually increase the distance between the two guide rails along the running direction of the film, and the clips hold both sides of the film. In a horizontal stretching machine for stretching the film in the horizontal direction with the travel of each of the clips traveling on the widening portion of the guide rail in a state in which the widening portion of the guide rail is received, A rotation is made about a rotation axis between a first receiving stand and a second receiving stand that receives a portion of the film on the upstream side in the running direction of the film from the expanded portion. A shaft support portion for supporting the shaft as much as possible, a substantially linear first rigid body portion constituting a main portion of the expanding portion fixed on the first cradle, and on the second cradle; A gap portion for adjusting a bending angle is provided between a substantially linear second rigid body portion forming a main portion of the upstream portion to be fixed, and a gap between the first rigid body portion and the second rigid body portion. A rail connecting body that can be bent and deformed is disposed between the rail connecting body, one end of the rail connecting body is fixed, and the other end is slidably connected in the extending direction of the guide rail; A film holding means for holding a center portion of a curved portion in the rail connection body near a stable ideal position when the receiving base is bent with respect to the second receiving base; Horizontal stretching machine. 2. The rail holding means according to claim 1, wherein said first and second receiving pedestals are directed inwardly of a bent portion between said first and second receiving pedestals. An intermediate arm having an outer end connected to a center portion of a curved portion of the rail connection body; an intermediate arm provided at an inner end of the intermediate arm, and disposed near the pivot support. One end is rotatably connected to each of the projecting portions of the first and second receiving stands, and the other end is rotatably connected to the turning fulcrum. 2. The film stretching machine according to claim 1, wherein the film is formed by a link mechanism having a first link arm and a second link arm. 3. The horizontal stretching machine for a film according to claim 1, wherein the rail connection body is formed by a metal plate overlapping portion in which a plurality of metal plates are stacked. 4. A pair of left and right guide rails for guiding the running of a plurality of pairs of left and right clips respectively gripping both sides of the film, and the distance between the two guide rails is gradually enlarged along the running direction of the film. An expanded portion to be formed is formed on the guide rail, and in a state where both sides of the film are gripped by the clip, the film moves sideways as the clips run on the expanded portion of the guide rail. In a tenter clip traveling guide device for a transverse stretching machine for a film to be stretched in a direction, a first cradle for receiving a portion of the expanding portion of the guide rail, and an upstream of the expanding portion in a running direction of the film. A supporting portion rotatably supported about a rotation shaft between a second receiving base for receiving the side portion and the second receiving base, and fixed on the first receiving base. A substantially linear first rigid body portion that forms a main portion of the expanding portion, and a substantially linear second rigid body portion that forms a main portion of the upstream portion fixed on the second cradle. A gap portion for adjusting the bending angle is provided between the first rigid portion and the second rigid portion, and a rail connector that can be bent and deformed is disposed between the first rigid portion and the second rigid portion. In a fixed state, the other end side is slidably connected in the extending direction of the guide rail, and when the first receiving base is bent with respect to the second receiving base, A tenter clip traveling guide device for a transverse stretching device for a film, comprising a rail holding means for always holding a center portion of a curved portion near a stable ideal position.