JPH0412957A - Link device for simultaneous two-shaft drawing device - Google Patents

Abstract

PURPOSE:To smoothly run a link device in contracted condition confined with a guide rail by fitting the inner ring of a ball bearing to a link shaft, arranging ball bearings and a ball bearing housing on the inner ring of ball bearing, and confining the ball bearing housing with a guide rail. CONSTITUTION:Simultaneous two-shaft drawing of a sheet-like object is performed by passing through a process in which both side edges of the sheet- like object of thermoplastic resin are gripped and simultaneously drawn in two directions longitudinal and transverse, and a process in which the sheet-like object is shrinked simultaneously in the longitudinal and traverse directions. at this time, ball bearings 66 and a ball bearing housing 67 are arranged on the inner ring 65 of the ball bearing fitted to a link shaft 23.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to the simultaneous and continuous stretching of a plasti-drop film or sheet in two axes: the longitudinal direction (longitudinal direction) and the width direction (transverse direction). The present invention relates to a link device for a simultaneous biaxial stretching device equipped with an endless link device.

[Conventional technology]

As a conventional two-wheel simultaneous stretching device,
As proposed in Publication No. 5, both types of sheet-like materials were gripped by a gripping device of an endless link device, and were continuously moved through a heating device to be simultaneously stretched vertically and horizontally, and then subjected to a heat treatment process to become a product. . The link device was as shown in FIGS. 3 to 6 of the same publication. Of these,
The link shaft, roller bearing shaft, and thrust bearing portion are shown in FIG. 5 of the present invention.

As shown in detail in FIG. 6, the inner ring ω of the roller bearing 61. The outer ring of the king bearing is similar to the outer ring of the ball bearing, and is attached to the link shaft.A thrust bearing is attached to the bottom of the link shaft.

Furthermore, Japanese Patent Application Laid-open No. 63-227323 aims to produce a high-performance film in which the molecular orientation of a sheet-like material is balanced in the longitudinal and lateral directions, and after simultaneous stretching in the longitudinal and lateral directions,
In order to achieve simultaneous contraction in both the longitudinal and lateral directions, it has been proposed to vary the pitch of the gripping devices of the linkage by restraining the roller bearings with guide rails.

[Problem a that the invention attempts to solve]

Among the above-mentioned conventional techniques, Japanese Utility Model Publication No. 45-6785 proposes an apparatus for simultaneously stretching a sheet-like material in two axes (vertical and horizontal directions), while JP-A-63-227323 proposes a device that stretches a sheet-like material in the longitudinal and lateral directions of the product film. In order to improve the isotropy of the material, this is a new proposal in which the material is simultaneously stretched in two axes, then subjected to a heat treatment process to be simultaneously shrunk in both the vertical and horizontal directions, and then cooled. In such a case where the two wheels are simultaneously contracted, the link device must run while being restrained by the guide rail, which reduces the strength and rigidity of the roller bearing λ'.

Problems arise with dimensional stability.

The object of the present invention is to have sufficient strength to run while being restrained by the guide rail in the above-mentioned simultaneous biaxial stretching Ml.
It is an object of the present invention to provide a link device that has rigidity and stability in two dimensions and runs smoothly.

[Means for Solving the Problems] In order to achieve the above objective, we investigated the strength, rigidity, and dimensional stability of the conventional roller bearing structure, and determined the load applied to the roller bearing and the amount of deformation of the roller bearing.

The data on the trajectories were collected and the optimal roller structure was found to improve the data.

That is, a ball bearing inner ring is fitted to the link shaft, a ball bearing and a ball bearing housing are set in the ball bearing inner ring, and the ball bearing housing is restrained by a guide rail.

[For production]

In the simultaneous biaxial stretching section, the link device gradually opens the link plates and expands the link pitch from the minimum link pitch state in which the link plates, etc. are contracted, due to the regulation and restraint of the guide rail, and increases the link pitch to the maximum link pitch, that is, the maximum link pitch. Stretching is completed in the open state. The link device is not restrained by the guide rail in the maximum link pitch state,
The stretching locus is simply regulated. Since the link device is at the maximum link pitch from the heat treatment after the heat treatment to the cooling section until it becomes the product film, it is not constrained by the guide rail, but if a simultaneous shrinkage process is provided, the guide rail will change from the maximum link pitch state to By re-binding with the rail, the pitch is reduced by a predetermined amount (from several inches to about 10%), so the restraining force becomes stronger. Therefore, the strength and rigidity of roller bearings.

By increasing the dimensional stability, the linkage device can maintain a predetermined yield and move smoothly.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, the roller bearing blade is a ball bearing inner ring S.

It consists of a ball bearing 66, a ball bearing housing nail, and is fastened to the link shaft. Since the roller bearing λ is restrained by the guide rails 4 and 5, a radial load acts on it.

Figures 11 and 3 show examples of conventional roller bearings λ'. The inner diameter of the ball bearing inner ring ω is 250. When the outer diameter of the ball bearing outer ring 0 is 620% and the outer diameter of the ball bearing housing is 761113E, the amount of deformation of the outer diameter of the ball bearing housing B with respect to the radial load P is a, and the amount of deformation perpendicular to this deformation 1a is b.

FIG. 2 shows an embodiment of the roller bearing of the present invention.

Ball bearing inner ring 6 inner diameter 25111m, ball bearing housing C
The outer diameter of the ball bearing housing is 76 mm, and the relationship between the radial load P and the deformation amounts a and b of the outer diameter of the ball bearing housing is the same as in FIG.

FIG. 4 shows data on the load and deformation amount of the roller bearing shown in FIG. 2.3. The horizontal axis shows the load P, and the vertical axis shows the amount of deformation 2.
and b, and the data for the conventional bearing (Fig. 3) is shown as a solid line. There is almost no deformation up to a load of 2 tons, but the amount of deformation increases rapidly from a load of 5 tons, and at a load of 10 tons (indicated by point A), the bearing cannot rotate. ), cracks occur in the ball bearing inner ring ω and the ball bearing outer ring 0, resulting in damage.

As shown in Figure IJ15, there is a slight space @K between the roller bearing blades' and the guide rails 4 and 5, 6 and 7, but the function as a bearing will be lost due to the increase in the amount of deformation. .

In the bearing according to one embodiment of the present invention (Fig. 2), the load is 2 tons,
At 5 tons, there is almost no deformation, and even at a load of 10 tons, which would prevent conventional roller bearings from rotating, the amount of deformation is small and healthy.At a load of 15 tons, the ball bearing housing/g 67 cracks and breaks. , the amount of deformation is less than one tenth of that of conventional bearings.

Therefore, by using the bearing roller of this embodiment, it is possible to provide a link device that can run smoothly while being restrained by the guide rail.

〔Effect of the invention〕

According to the present invention, since the amount of deformation of the roller bearing is small and smooth rotation is possible on the contact surface with the guide rail, there is an effect that the link device, which is restrained by the guide rail and in a contracted state, can run smoothly. . In addition, the load capacity until one rotation failure is large, and under the same load conditions, there is also the effect of increasing the rotation life.

[Brief explanation of the drawing]

Figure iJ1 is a longitudinal cross-sectional view of a roller bearing portion according to an embodiment of the present invention, and Figure 2 is an explanatory diagram of a roller bearing according to an embodiment of the present invention.
Fig. 3 is an explanatory diagram of a conventional roller bearing, Fig. 4 is a diagram of relationship data between load and deformation of the roller bearing, and Fig. 115 is a vertical cross-sectional view of a conventional link device. ! ! FIG. 6 is a longitudinal sectional view of a roller bearing portion of a conventional link device. 4, 5. 6. 7...Guide rail, co-
...Link shaft, holder...Roller bearing, ah...
...Thrust bearing, 6...Ball bearing inner diameter, 6
...Ball bearing, 67...Curved ball bearing 1 Figure 4 Figure 11

Claims (1)

[Claims] 1. Simultaneous production of a sheet-like material, which consists of a step of gripping both edges of the thermoplastic resin sheet-like material and stretching it simultaneously in two directions, and a shrinking step of shrinking the stretched sheet-like material simultaneously in both directions. In the link device of a biaxial stretching device, a ball bearing inner ring is fitted to the link shaft, a ball bearing and a ball bearing housing are arranged in the ball bearing inner ring, and the ball bearing housing is restrained by a guide rail. Link device of simultaneous biaxial stretching device.