JP2003103629A - Simultaneously and biaxially stretching machine for sheetlike article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that high speed running is impossible because a running system is a slide system in the conventional technique of a simultaneously and biaxially stretching machine and staining due to scattering of lubricant is generated because it is necessary to forcibly supply the lubricant to a slide part. SOLUTION: The inner ring of a radial bearing supporting the stretching force of a sheetlike article is divided into two upper and lower parts and the upper part is fitted to a link shaft while the lower part is formed as a freely rotatable structure and the radial bearing is attached to the lower inner ring at the position eccentric from the center not only to enable the free following in the running direction of a link device but also to enable smooth high speed running. The forcible supply of the lubricant from the outside is dispensed with by employing the radial bearing due to a grease sealing system and the scattering of the lubricant can be prevented. Further, smooth high speed running also becomes possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simultaneous biaxial stretching machine for a sheet-like material, such as a thermoplastic resin film, which is continuously stretched in both longitudinal and lateral directions simultaneously.

[0002]

2. Description of the Related Art A conventional ball bearing for a link device of a simultaneous biaxial stretching machine comprises a thrust bearing which receives its own weight and a ball bearing which rolls in a guide groove, as proposed in Japanese Unexamined Patent Publication No. 8-267570. ing.

[0003]

The link device of the type in which the thrust receiver is provided to support its own weight has a large resistance during running and cannot run at high speed. Furthermore, a large amount of lubricating oil is required for the sliding part. Therefore, there is a problem that the lubricating oil scatters on the film and causes stains.
Further, when a radial bearing is attached to the link shaft instead of the thrust receiver, the relative angle between the moving direction of the link device and the link shaft changes at the same time when extending in the vertical and horizontal directions, so the radial bearing mounting shaft is attached to the link shaft. If fixed, it cannot follow the change in the relative angle, so that there is a problem that an excessive load in the axial direction acts on the radial bearing during traveling and the life is shortened. An object of the present invention is to provide a simultaneous biaxial stretching machine for sheet-like materials, which is capable of stable running at high speed and preventing stains due to oil scattering.

[0004]

[Means for Solving the Problems] Considering the strength, rigidity, etc. of the ball bearing from the load acting on the ball bearing, the inner ring is divided into upper and lower parts, and only the upper inner ring is fitted to the link shaft. A ball bearing housing made of an integral body is brought into contact with both inner surfaces of the guide rails via balls (rolling elements) and rotated with respect to the inner ring.
On the other hand, the lower inner ring has a structure capable of freely rotating with respect to the ball bearing housing via balls (rolling elements).
The above object is achieved by fixing the shaft at a position eccentrically in the radial direction from the center position of the lower inner ring and mounting a radial bearing whose outer surface is hardened on the shaft.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. First, the basic configuration of the simultaneous biaxial stretching machine will be described with reference to FIG.

In FIG. 1, 1 is a sheet-like material, and 2 is a clip of an endless link device for holding the sheet-like material and guiding it from the inlet to the outlet. The sheet-like object 1 is gripped at both ends by the link device 3 driven by the sprockets 7, 8 and 9 at the inlet of the preheating portion (A) and is stretched after preheating (B).
After being simultaneously stretched in two directions in the vertical and horizontal directions, predetermined heat treatment is performed in the heat treatment section (C), and the link device 3 is detached in the detachment section (D).

FIG. 2 is a vertical sectional view in which the thrust receiver 11 of the conventional sliding type link device is fitted to the link shaft 10. Since the thrust receiver 11 has no directivity in the sliding direction, even if the relative angle between the running direction of the link device and the link shaft changes arbitrarily, there is no problem in being fixed to the link shaft 10.

FIG. 3 shows an example of mounting a radial bearing for a rolling traveling type link device according to the present invention below the link shaft 10. FIG. 4 shows a sectional view taken along the line AA of FIG. Link axis 1
The upper inner ring 15 is fitted to 0, and the ball bearing housing 14 is brought into contact with the guide rails 4 and 5 via the ball 13 and rotated. On the other hand, the ball bearing housing 14 is provided with a lower inner ring 16 which is freely rotatable by cutting the edges of the upper inner ring 15 and the link shaft 10 through the balls 13. From the center of this lower inner ring 16 to the position of the eccentricity Le in the radial direction, the shaft 17
By mounting a radial bearing 18 having a hardened layer on the outer surface of the link shaft by mounting a radial bearing 18 on the outer surface of the shaft, the radial bearing 18 can be easily attached to the link shaft 10 even if the traveling direction of the link device changes. In addition, it is possible to prevent the problem that an excessive load in the axial direction is applied when the vehicle travels reliably. A minute gap K is provided between the ball bearing housing 14 and the inner surfaces of the guide rails 4 and 5 in consideration of the difference in thermal expansion during operation and ensuring smooth running.

From the above, the ball bearing unit 13 of this embodiment,
By using the radial bearings 14, 15, 16 and the radial bearing 18, it is possible to provide a link device that can travel smoothly at high speed while being restrained by the guide rails.

[0010]

According to the present invention, since the resistance during running is only rolling frictional resistance, running resistance is reduced, and high-speed running beyond the conventional sliding type link device becomes possible. Further, by adopting grease-filled type bearings for the ball bearings and radial bearings used in the running part, it is not necessary to forcibly supply oil from the outside to operate, and the problem of oil scattering is solved.

[Brief description of drawings]

FIG. 1 is a plan view of the entire assembly showing an embodiment of a simultaneous biaxial stretching machine according to the present invention.

FIG. 2 is a longitudinal sectional view of a link shaft portion of a conventional sliding type link device for a simultaneous biaxial stretching machine.

FIG. 3 is a cross-sectional view showing an example of a bearing portion for a rolling type link device, which is a ball bearing in which an inner ring is vertically divided into two parts.

4 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

1 ... Sheet-like material, 2 ... Clip, 3 ... Link device, 4,
5, 6 ... Guide rail, 7, 8, 9 ... Link device driving sprocket, 10 ... Link shaft, 11 ... Thrust receiver,
12 ... Ball bearing inner ring, 13 ... Ball (rolling element), 14 ... Ball bearing housing, 15 ... Upper inner ring, 16 ... Lower inner ring, 17 ...
Shaft, 18 ... Radial bearing.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tetsuya Kono             Yamaguchi Prefecture Kudamatsu City Oita Toyoi 794 Stock Association             Inside Hitachi Kasado Works F-term (reference) 4F210 AG01 QC07 QG01 QG18 QL01                       QL04 QL06

Claims (6)

[Claims] 1. An endless link device in which a plurality of gripping devices for gripping both side ends of a thermoplastic resin sheet-like object are arranged at both side ends of the sheet-like object, and the endless linking device is formed in a folded shape. It is composed of a plurality of equal-length link devices, driven by the sprocket on the inlet side of the sheet-like material, and guided by guide rails arranged in a divergent shape in the direction of movement to gradually increase the gripping pitch, and In the simultaneous biaxial stretching machine of the sheet-like material configured to remove the sheet-like material after being simultaneously stretched in two directions, and driven by the outlet side sprocket to return to the inlet-side sprocket, The inner ring of the ball bearing attached to the lowermost end of the joint link shaft of the link plate is divided into upper and lower parts and the upper inner ring is fitted to the link shaft. A ball bearing housing comprising a body thereof is rotated in contact with the guide rail side, further simultaneous biaxial stretching machine of the sheet, characterized in that the free rotation of the lower inner ring against both. 2. The simultaneous biaxial stretching machine for a sheet-like material according to claim 1, wherein the rolling element of the ball bearing is replaced with a ball and is any one of a cylindrical roller, a tapered roller and a spherical roller. 3. A radial bearing for supporting the weight of the link device is attached to a lower inner ring divided into two parts of the ball bearing so that the direction of the radial bearing can easily and reliably follow the running direction of the link device. By arranging the center of rotation of the radial bearing at a position eccentric in the radial direction from the center of the inner ring of the ball bearing, the running resistance between the link device and the running path becomes only rolling friction resistance, and the conventional sliding type link device The simultaneous biaxial stretching machine for a sheet-like material according to claim 1 or 2, wherein the traveling speed can be made higher than the traveling speed. 4. The sheet-like machine according to claim 1, wherein the ball bearing housing has an outer dimension slightly smaller than the distance between the inner surfaces of the two guide rails. Simultaneous biaxial stretching machine for objects. 5. The simultaneous biaxial stretching machine according to claim 1, wherein the outer surface of the outer ring of the radial bearing that bears the vertical load of the link device is hardened to increase wear resistance. Simultaneous biaxial stretching machine for sheet materials, which has extended bearing life. 6. A grease-filled bearing is used for both the radial bearing for supporting the vertical load of the link device and the ball bearing for supporting the horizontal load of the sheet-like material, thereby eliminating oil supply. Simultaneous biaxial stretching machine for the sheet material described above.