JPH0460425B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is directed to a simultaneous biaxial stretching machine that simultaneously stretches a sheet material, such as a thermoplastic resin film, in the longitudinal and transverse directions. This invention relates to an adjustment device for an endless link device that allows gripping and stretching.

[Conventional technology]

In the conventional device, as described in Japanese Patent Publication No. 50-20590, the positions of the left and right gripping devices (link grips) in the film advancing direction are required to be the same due to the characteristics of the film. , adjustment of the number of links on the film side due to elongation of the link device used for a long time, wear of the guide groove, and adjustment when setting the initial number of links. As shown in the figure, finely adjustable clutch plates 21 and 22 are attached to the drive sprocket 12a.
By disengaging the clutch and turning the sprocket to an arbitrary position, the number of links can be adjusted regardless of the other drive systems. However, since this link adjustment method uses a clutch mechanism, the amount of adjustment is determined by the combination of the number of teeth, so stepless adjustment has not been considered.

[Problem that the invention seeks to solve]

In the above-mentioned prior art, the amount of adjustment is determined by the combination of the number of teeth of the clutch, so it is not possible to adjust an arbitrary amount. Furthermore, in order to make the adjustable amount infinitely small, it is necessary to increase the number of teeth in the clutch, which posed a problem in that the clutch must be made larger.

An object of the present invention is to provide a link adjustment device that can adjust any amount steplessly without increasing the size of the device.

[Means for solving problems]

In general, a link device of a simultaneous biaxial stretching machine using an endless link and a guide groove is pushed by a front film side sprocket, then pulled by a rear sprocket, and travels while being regulated by the guide groove to stretch the film. Furthermore, the link on the opposite film side is pulled by the front anti-film side sprocket and is fed toward the film side sprocket.

In this device, a total of six sprockets, front and rear, left and right, are driven simultaneously. Driving the left and right sprockets at the same time is essential because misalignment of the left and right gripping positions of the film poses a problem in terms of film characteristics. However, the present invention allows adjustment of the left and right gripping positions, and , which focused on the fact that if the link strength is sufficient, it is not necessary to drive all the link sprockets, and the above purpose is to use the left and right front sprockets as driving sprockets, and the rear sprocket to advance the film as a driven sprocket. This is achieved by installing the device movably in the direction.

[Effect]

By moving the driven sprocket in the front-rear direction, the distance between the front and rear sprockets can be changed, and the number of links in the film-side guide groove can be adjusted as desired. In addition, the link is pushed by the front film side drive sprocket,
Thereafter, the link on the opposite side to the film side is also pulled by the drive sprocket on the opposite side to the film side.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. The film 1 is stretched continuously in the direction of the arrow A and simultaneously in two directions, the longitudinal direction and the lateral direction, while its both sides are held by the grippers 2. The gripper 2 is attached to a link device 3 connected in a ladder shape, grips both edges of the film 1 by means of a film gripping guide 4, and simultaneously stretches the film 1 in a shape that widens toward the end, thereby pulling the film on the exit side. Both side edges of the film 1 are separated by a removal guide 5. The movement of the link device 3 is restricted by guide rails 6, 7 and 8, 9, and is driven endlessly by film entrance side sprockets, ie, drive sprockets 10, 11. As shown in FIG. 2, the drive system of the drive sprockets 10 and 11 is transmitted by an electric motor 13 via a chain 14 to a reducer 15 and a line shaft 16 provided in the width direction, and then to a chain 17 and a line shaft 16 provided in the width direction.
The link device 3, which is engaged with the drive sprocket 10 or 11 via the link 8, is driven. The film outlet side sprocket, that is, the driven sprocket 12 is installed on a mounting seat 20 that freely slides in the front-rear direction (film flow direction) on a bed 19, which is a running path for the link device 3, and is hinged to the mounting seat 20. By operating the handle 23 of the threaded rod 24, the distance between the centers of the drive sprockets 10, 11 and the driven sprocket 12 can be changed, and the tension of the link device 3 engaged with the drive sprocket 11 allows the driven sprocket to rotate freely. It has become a method. That is,
It is not driven by the power of the electric motor 13.

In such a mechanism, when adjusting the deviation between the left and right gripping positions, by turning the handle 23 and moving either the left or right driven sprocket 12 to the front or rear, the gripping position can be adjusted to the front or rear by that amount. It is now possible to move the camera and adjust the deviation. Furthermore, if the amount of left and right deviation is known quantitatively in advance, it is only necessary to move the driven sprocket 12 by this amount, so if a scale is attached to the sliding mounting seat 20, adjustment will be made even easier. .

〔Effect of the invention〕

According to the present invention, the gripping position can be adjusted steplessly and even by a small amount. Furthermore, the drive parts such as the clutch can be freely adjusted by a desired amount without disassembling them.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the simultaneous biaxial stretching device according to the present invention, Fig. 2 is an explanatory diagram of the driving device, Fig. 3 is a longitudinal side view of the rear sprocket, and Fig. 4 is a link adjustment device according to the prior art. FIG. DESCRIPTION OF SYMBOLS 1...Film, 2...Gripper, 3...Link device, 4...Film gripping guide, 5...Film removal guide, 6-9...Guide rail,
10, 11... Drive sprocket, 12... Driven sprocket, 13... Electric motor, 14, 17...
Chain, 15, 18...Reducer, 16...Line shaft, 19...Bed, 20...Mounting seat,
21, 22...clutch plate, 23...handle,
24...Threaded rod.

Claims (1)

[Claims] 1. A plurality of gripping devices for gripping both edges of a thermoplastic synthetic resin film are provided on endless movable links, and the links are composed of links of equal length hinged in a ladder shape, and the gripping devices are configured to grip both edges of a thermoplastic synthetic resin film. In a simultaneous biaxial stretching device that uses a link mechanism that is guided in a widening manner on a pair of guide rails whose spacing gradually decreases along the direction and moves while gradually increasing speed, a sprocket on the entrance side of the film that engages with the link is A link adjustment device for a simultaneous biaxial stretching apparatus, characterized in that the drive sprocket and the film exit side sprocket are driven sprockets, and the film exit side sprocket is installed so as to be movable in the film traveling direction.