JPH0442099Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a film transverse stretching device.

(B) Prior Art A conventional film lateral stretching device is disclosed in, for example, Japanese Patent Application Laid-open No. 120033/1983. The film transverse stretching device described in this document stretches the film in the width direction by gripping both edges of the continuously fed film in the width direction with clips. A rotatable roller and a pressing device for pressing the roller against the film surface are provided nearby. Some devices press rollers against the surface of the film during the stretching operation, thereby smoothing out wrinkles in the film and ensuring that the clips are engaged with the film.

(c) Problems to be solved by the invention However, although the conventional film transverse stretching device as described above can remove wrinkles from the film by applying tension in the width direction to the film using rollers, There is a problem in that it is not possible to eliminate warping that occurs at both edges of the film. That is, the film sent to the film transverse stretching device is not completely flat, and both edges thereof are warped upward or downward. This edge warpage is thought to be caused by uneven stretching in the longitudinal direction in the longitudinal stretching machine in the immediately preceding process, non-uniformity in the thickness of the film in the width direction, and the like. When warpage occurs at both edges in the width direction of the film, there may be parts where the film is not smoothly bitten by the clip, resulting in a film that is partially insufficiently stretched. When a roller is pressed against the film to remove wrinkles, as shown in the above-mentioned publication, the film is stretched in the width direction, which may promote warping of the edges in some cases. The present invention aims to solve these problems.

(d) Means for Solving the Problems The present invention solves the above problems by providing a straightening roll device for correcting the warpage of the edges of the film at a position before the film is held between the clips. That is, the film transverse stretching device according to the present invention has a straightening roll device that contacts both edges of the film at a position upstream of the clip gripping start position. This straightening roll device has a vertical adjustment mechanism that can adjust the vertical position and an inclination angle adjustment mechanism that can adjust the inclination angle about an axis parallel to the film feeding direction.

(E) Function Adjust the vertical position of the straightening roll device so that the roller contacts the edge of the film, and then adjust the inclination of the roller to correct the warpage of the edge of the film, depending on the direction of the warp. . This corrects the warpage of the edges of the film being fed, and the film is fed in a substantially flat state to the position where the film is inserted into the clip. Therefore, the clip securely grips the film and performs the stretching operation. Therefore, problems such as those caused by partially uneven stretching can be prevented.

(f) Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 6 of the accompanying drawings.

1 and 2 show the entire film transverse stretching apparatus according to the present invention. The horizontal stretching device 10 is a longitudinal stretching device 12
The film 14 is placed on the downstream side of the first
and 2 are sent from the left to the right in Figure 2. That is, the film 14 leaving the longitudinal stretching device 12 is sent to the transverse stretching device 10 via a guide roll 16 and a straightening roll device 18, where it is laterally stretched and sent out. A pair of endless clips 20a is used for horizontal stretching.
and 20b. The clips 20a and 20b have an interval approximately equal to the width of the film 14 before being laterally stretched on the inlet side of the transverse stretching device 10, and are spaced apart from each other approximately equal to the width of the film 14 before being laterally stretched on the outlet side.
The spacing has been expanded to have a width of .
Clips 20a and 20b each hold film 1.
It can grip both edges of the film 14 and run in synchronization with the feeding of the film 14, thereby pulling the film 14 in the width direction and stretching it laterally. Clips 20a and 2 of the transverse stretching device 10
3 and 4 are enlarged views of the correction roll device 18 provided slightly upstream of the gripping start position of 0b. Bracket 2 attached to stationary part
A body 26 is attached to 2 by bolts 24. A vertically movable block 28 is supported on the body 26 so as to be vertically movable. The vertical position of the vertical movement block 28 can be adjusted by a vertical adjustment mechanism 30. The vertical adjustment mechanism 30 includes a male screw 32 fixed to the vertical movement block 28, a sleeve 34 having a female screw that engages with the male screw 32, a flexible shaft 36 connected to the sleeve 34, and a rotatable handle of the flexible shaft 36. 38. A substantially semicircular gear 50 is swingably supported by a shaft 40 extending horizontally to the vertically movable block 28. A swing block 42 is integrally attached to this gear 50. A roller 48 is rotatably supported by a shaft 44 fixed to a swing block 42 via a bearing 46. Gear 50 meshes with rack 52. Rack 52
has a female thread on its inner diameter, which engages with the male thread of the shaft 54. Therefore, the rack 52 can be moved in the axial direction of the shaft 54 by rotating the shaft 54. The shaft 54 is supported by the vertically movable block 28 and is connected to a handle 56 by a flexible shaft 55. Swing block 42, gear 50, rack 52,
Shaft 54, flexible shaft 55, handle 5
6, etc., constitute an inclination angle adjustment mechanism 57 (the gear 50, the rack 52, and the shaft 54 can also be a worm gear mechanism). A pair of straightening roll devices 18 having such a configuration are used to straighten the film 14.
are provided at positions that allow contact with both edges of the

Next, the operation of this embodiment will be explained. First, the vertical position of the roller 48 is adjusted so that it lightly contacts the lower surface of the film 14. That is, when the sleeve 34 is rotated via the flexible shaft 36 by rotating the handle 38, the male screw 32 moves up and down, and the vertical movement block 28 integrated therewith also moves up and down. This allows the vertical position of the roller 48 to be adjusted. At the same time, the inclination of the roller 48 is adjusted. That is, when the shaft 54 is rotated via the flexible shaft 55 by rotating the handle 56, the rack 52, which has a female thread that meshes with the male thread on the outer periphery, moves in the axial direction, and the gear 50 that meshes with the rack 52 moves in the axial direction. It rotates around an axis 40. Therefore, the swing block 42 integral with the gear 50 and the roller 48 supported by the swing block 42 via the shaft 44 are tilted. The direction of inclination of the roller 48 is set according to the direction of warpage of the edge of the film 14. That is, the fifth
If the edge 14a of the film 14 is curved downward as shown in Figure a, the roller 48 is tilted in a direction that lifts the edge 14a. Also,
Conversely, if the edge 14a of the film 14 is oriented upward, the roller 48 is tilted in the opposite direction as shown in FIG. 6a. Since the film 14 is fed under constant tension in the longitudinal direction, as shown in FIGS. 5a and 6a, the rollers 4
8 are brought into contact with each other at an angle, the warpage of the edge 14a of the film 14 is corrected as shown in FIGS. 5b and 6b, respectively. The film 14 with the warped edges 14a corrected is immediately attached to the clips 20a and 20.
clips 20a and 20b
It is stretched laterally as the distance between the two increases. This results in a film having a predetermined width. FIG. 7 shows how the film 14 is held by the clips 20a and 20b. With the film 14 placed on the table 60 of the clip 20a,
When rotating 2 from the dashed line position to the solid line position,
The film 14 is placed between the table 60 and the show 62.
is inserted. Since the edge 14a of the film 14 is not warped, the shoe 62 reliably attaches to the film 1.
4 can be inserted. The edge 14 of the film 14 is fixed by the straightening roll device 18 as described above.
a is corrected and the film 14 is reliably gripped by the clips 20a and 20b, so that the lateral stretching is performed uniformly and the occurrence of partial stretching defects is prevented.

(g) Effects of the invention As explained above, according to the invention, a straightening roll device is provided in front of the clip to correct the warping of the film edge, so that the film can be held securely by the clip. This can prevent the occurrence of lateral stretching defects.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the entire film transverse stretching device according to the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is an enlarged front view showing the straightening roll device, and Fig. 4 is Fig. 3. , Figures 5a and 5b are views showing the corrected state when the film edge runs downward, Figures 6a and 6b are views showing the corrected state when the film edge runs upward, and Figure 7 shows the corrected state when the film edge runs upward. The figure shows the film gripping state of the clip. 10... Lateral stretching device, 14... Film, 18
... Straightening roll device, 20a, 20b... Clip.

Claims (1)

[Claims for Utility Model Registration] 1. A method in which both edges in the width direction of a continuously fed film are gripped by a pair of endless clips that run in the film feeding direction at the same speed as the film feeding speed, and In a film transverse stretching device that stretches the film in the width direction by increasing the distance between the clips, a straightening roll device that contacts both edges of the film is provided at a position upstream from the gripping start position of the clip. The straightening roll device has a vertical adjustment mechanism that can adjust the vertical position and an inclination angle adjustment mechanism that can adjust the inclination angle about an axis parallel to the film feeding direction. Device. 2. The film transverse stretching device according to claim 1, wherein the vertical adjustment mechanism and the inclination angle adjustment mechanism of the straightening roll device can be mechanically and remotely controlled by a manual handle.