JPH11227042A - Simultaneously biaxially orienting machine for sheet-like material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably feed at a high speed and to prolong a lifetime by installing bearings made of a single steel ball or a plurality of steel balls circumferentially disposed at the lowermost part of a link shaft for a joint of a link plate, and forming a groove at a bed side for guiding the balls. SOLUTION: A link plate 11 is coupled to other link plate via a ink shaft 13 or a link pin 14 to form an endless loop. In this ball bearing structure, a steel ball race 12 having a hole for mounting a steel ball 10 is provided at a lowermost part of the shaft 13. And the ball 10 is mounted in a hole of the race 12. Meanwhile, a bed 15 to become a feeding passage is constituted by a wear resistant material 20, a rounded groove 19 is formed at an upper surface side of the material 20, and the ball 10 is fed on the groove 19. And, a radial bearing 16 is installed at the shaft 13 at a position of an upper part of the race 12. And the bearing 16 is restricted by a guide groove formed of guide rails 4, 5, 6 and fed.

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, for example, a sheet-like material which continuously and continuously stretches a thermoplastic resin film or the like in two vertical and horizontal directions.

[0002]

2. Description of the Related Art Conventionally, a running portion of a link device of a simultaneous biaxial stretching machine is constituted by a thrust receiver which receives its own weight and a radial bearing which rolls a guide groove as described in Japanese Patent Application Laid-Open No. 4-1957. . Further, as described in Japanese Utility Model Application Laid-Open No. 62-147520, the horizontal stretching machine is composed of a rolling bearing which runs under its own weight and a bearing which runs on a guide rail.

[0003]

In a system in which a thrust receiver is provided to support its own weight, running resistance is large due to sliding running, and as a result, high-speed running cannot be performed. Further, since a large amount of lubricating oil is required for the sliding portion, there is a problem that the lubricating oil scatters on the film and causes contamination.

On the other hand, in a manner that travels while receiving the weight with bearing rolling as transverse stretching machine is mechanically becomes complicated in order to travel while following the traveling direction of the link, practically employed difficult for just traveling The direction is fixed. For this reason, a thrust load acts on the bearing, causing a problem in the life of the bearing and a problem in abrasion of the running path.

SUMMARY OF THE INVENTION An object of the present invention is to provide a simultaneous biaxial stretching machine for a sheet-like material which achieves stable running at a high speed and a long life.

Another object of the present invention is to provide a simultaneous biaxial stretching machine for a sheet-like material in which oil scattering is suppressed.

Still another object of the present invention is to provide a simultaneous biaxial stretching machine for a sheet-like material capable of running at high speed and suppressing oil scattering.

[0008]

According to the present invention, in order to achieve the above object, the present invention provides a device that rolls while following its own weight in any direction while receiving its own weight. A bearing consisting of a single steel ball or a plurality of steel balls arranged circumferentially is installed. A single steel ball or a plurality of circumferentially arranged steel balls have a small running resistance because the steel ball itself rotates and travels on a bed serving as a travel path. Since the running of such a bearing is based on the rotation of the steel ball itself, the bearing can run in all directions on a plane, and the running direction is not limited.

On the other hand, a groove is formed on the bed side for guiding such a hard sphere, and a small amount of lubricant such as grease is supplied to the groove. The supply of the lubricant may be continuous or intermittent. Also, even if the supply is performed directly to the groove, or provided a through hole in the vertical direction to the link axis,
It may be supplied indirectly from above the through hole. As the lubricant, a lubricant that does not cause instillation (for example, a fluorine-based ultra-high temperature grease) is preferably used to prevent scattering.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a basic configuration diagram showing one embodiment of a simultaneous biaxial stretching machine according to the present invention.

In FIG. 1, reference numeral 1 denotes a sheet-like material which is simultaneously stretched in the vertical and horizontal directions, and reference numeral 2 denotes a clip for gripping the sheet-like material. A plurality of linking devices 3 are provided and form an endless linking device which is connected to each other. The orbital movement of the endless linking device causes the clip 2 to grip the sheet at the entrance and separate at the exit. The trajectory of the endless link device in its orbital movement is determined by the arrangement of the guide rails 4, 5 and 6. At the entrance of the preheating section (A), the sheet-like material 1 is gripped on both side ends at the entrance of the preheating section (A) and moved in the direction of arrow M by the link device 3 driven by the sprockets 7, 8, 9, and the preheating stretching section In (B), the film is simultaneously stretched in two directions. Thereafter, the sheet 1 is subjected to a predetermined heat treatment in the heat treatment section (C), and is separated from the link device 2 in the removal section (D).

FIG. 2 is a longitudinal sectional view showing an example of the link device 3 in which a ball bearing is formed from a single hard sphere.

The link plate 11 is connected to another link plate via a link shaft 13 or a link pin 14 to form an endless loop.

In this ball bearing structure, a steel ball bearing 12 having a hole for mounting the steel ball 10 is provided at the lowermost portion of the link shaft 13, and the steel ball 10 is mounted in the hole of the steel ball bearing 12. The steel ball receiver 12 is provided with a cover 18 so that the steel ball 10 does not fall when the link device 3 is lifted, and foreign matter does not easily enter the steel ball portion.

On the other hand, the bed 15 serving as a traveling path is made of a wear-resistant material 20, and an R groove 19 is provided on the upper surface side of the wear-resistant material 20.
Is formed, and the steel ball 10 runs on the R groove 19. Steel ball 1
0 runs while rolling on the R groove 19,
Can move in any direction on the plane along the direction, and this movement is possible with relatively small force.

A radial bearing 16 is installed on the link shaft 13 at a position above the steel ball bearing 12, and the radial bearing 16 travels while being restricted by guide grooves formed by the guide rails 4, 5, and 6. Therefore, the link shaft 13 is
The traveling of the steel ball 10 on the R groove 19 and the traveling of the radial bearing 16 in the guide groove move along the trajectories of the guide rails 4, 5, and 6.

The lubricating oil for the steel ball receiver 12
A very small amount is automatically supplied intermittently through a supply hole 31 provided in the apparatus 5 or a supply hole 33 provided in the link shaft 13 so as to penetrate the upper and lower portions thereof. Since the heat treatment for stretching the film is performed at a high temperature of several hundred degrees Celsius, it is useful to use a lubricant which does not generate a dropping point at the heat treatment temperature in order to prevent scattering. High temperature grease is suitable. As a specific product of this type of lubricant, "BARRIE" manufactured by NOK Cruiba Co., Ltd.
RTA L55 / 2 ".

When the steel ball 10 or the steel ball receiver 12 is worn out and needs to be replaced, the supply hole 3 is supplied from the upper part of the link shaft 13.
3, a steel ball 10, a steel ball receiver 12 and a cover 1 are inserted.
Push out the bearing unit consisting of 8 and replace it with a new one.
When the bed 15 is worn, the wear-resistant material 20 is replaced.

When the target film 1 is thick or the tensile strength at the time of stretching is large, the link device 3 becomes large,
Since the load acting on 0 becomes large and the service life becomes a problem from the wear surface, this is dealt with by increasing the number of steel balls 10 and reducing the surface pressure as shown in FIG. In this case, the hard sphere 10
Are preferably arranged symmetrically on the circumference as shown in FIG.

[0021]

According to the present invention, since the running method is not sliding but rolling, and there is no constraint in the running direction, stable high-speed running with low running resistance is possible. Since the running is based on the rolling of the hard sphere, a large amount of lubricating oil is not required unlike the sliding running, and high-speed operation can be performed with a small amount of lubricating oil. This also eliminates the problem of oil stains. Furthermore, since there is no restriction in the running direction, no thrust load is applied, so that the life of the bearing and the running path can be extended.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing an example of a link device using a ball bearing made of a single steel ball.

FIG. 3 is a longitudinal sectional view showing an example of a link device using a ball bearing made of a plurality of steel balls.

FIG. 4 is a cross-sectional view of a ball bearing made of a plurality of steel balls as viewed from a lower surface side.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sheet-like material, 2 ... Clip, 3 ... Link device 4, 5, 6 ... Guide rail, 7, 8, 9 ... Sprocket for link device 10 ... Steel ball, 11 ... link plate 12 ... steel ball receiver, 13 ... link shaft, 14 ...
Lower rolling roller 15 ・ ・ ・ Bed 、 16 ・ ・ ・ Radial bearing 、 17 ・
..Thrust receivers 18: cover, 19: R groove, 20: lower wear-resistant material

Claims (10)

[Claims] 1. A pair of endless link devices in which a large number of link devices each having a clip and a link shaft for gripping both end portions of a thermoplastic resin sheet are connected, and a guide for determining a movement locus of the link shaft. A rail, and a sprocket that engages with the endless link device to drive the endless link device. The guide rail includes a pair of rails having side surfaces facing each other with the link shaft interposed therebetween. An abrasion-resistant material is provided at the bottom of the formed groove, and a ball bearing having a rigid ball that supports the self-weight and rolls in contact with the abrasion-resistant material is provided at a lower portion of the link shaft, and abuts against a side surface of the pair of rails. And a radial bearing having a hard sphere that rolls and runs. 2. The simultaneous biaxial stretching machine for sheet-like articles according to claim 1, wherein the ball bearing has one hard sphere. 3. The simultaneous biaxial stretching machine for sheet-like articles according to claim 1, wherein a plurality of hard balls of said ball bearings are arranged point-symmetrically on the circumference. 4. A sheet-like article according to claim 1, wherein said link shaft is provided with a hole penetrating between upper and lower portions thereof, and lubricant is supplied to said ball bearing through said hole. Simultaneous biaxial stretching machine. 5. A pair of endless link devices in which a large number of link devices each having a clip and a link shaft gripping both end portions of a thermoplastic resin sheet are connected, and a guide for determining a movement locus of the link shaft. A rail, and a sprocket that engages with the endless link device to drive the endless link device. The guide rail includes a pair of rails having side surfaces facing each other with the link shaft interposed therebetween. An abrasion-resistant material is provided at the bottom of the formed groove, and a ball bearing having a rigid ball that supports the self-weight and rolls in contact with the abrasion-resistant material is provided at a lower portion of the link shaft, and abuts against a side surface of the pair of rails. A radial bearing having a hard sphere that rolls and runs, and a means for supplying a lubricant that does not generate a drop point with respect to the ball bearing is provided. Simultaneous biaxial stretching machine. 6. A simultaneous biaxial stretching machine for sheet-like articles according to claim 5, wherein said lubricant is a fluorine-based grease for ultra-high temperature. 7. A pair of endless link devices in which a large number of link devices each having a clip and a link shaft gripping both end portions of a thermoplastic resin sheet are connected, and a guide for determining a movement locus of the link shaft. In a simultaneous biaxial stretching method using a simultaneous biaxial stretching machine including a rail and a sprocket that engages with the endless link device and drives the endless link device, the guide rails face each other across the link shaft. A pair of rails having side surfaces to be formed, and a wear-resistant material provided at the bottom of a groove formed by the pair of rails, and the lower part of the link shaft supports its own weight and rolls in contact with the wear-resistant material. A ball bearing having a traveling hard sphere and a radial bearing having a rigid sphere rolling in contact with the side surfaces of the pair of rails are provided, and rolling of the ball of the ball bearing and the radial bearing is performed. A simultaneous biaxial stretching method for a sheet-like material, wherein the link shaft is moved by running. 8. A pair of endless link devices in which a large number of link devices each having a clip and a link shaft gripping both end portions of a thermoplastic resin sheet-like material are connected, and a guide for determining a movement locus of the link shaft. A rail, and a sprocket that engages with the endless link device to drive the endless link device. The guide rail includes a pair of rails having side surfaces facing each other with the link shaft interposed therebetween. An abrasion-resistant material is provided at the bottom of the formed groove, and a ball bearing having a rigid ball that supports the self-weight and rolls in contact with the abrasion-resistant material is provided at a lower portion of the link shaft, and abuts against a side surface of the pair of rails. When using a simultaneous biaxial stretching machine provided with a radial bearing having a hard sphere that rolls and runs, a lubricant that does not generate a drop point with respect to the ball bearing and the radial bearing is used. Using simultaneous biaxial stretching machine and supplying. 9. An endless link device in which a plurality of gripping devices for gripping both side ends of a thermoplastic resin sheet is provided at both ends of the sheet, and the endless link is formed in a foldable shape. Driven by the sheet-side entrance sprocket, and guided by guide rails arranged in a divergent shape in the direction of movement to gradually increase the gripping pitch, thereby forming a sheet-like object. After simultaneously stretching the sheet in two directions, the sheet is removed, and the sheet is driven by the outlet sprocket to return to the inlet sprocket. The self-weight is supported by bearings in which one or more steel balls or ceramic balls, and special resin balls are arranged in a circle at the bottom of the link shaft for the joint of the link plate. Further simultaneous biaxial stretching machine of the sheet, characterized in that mounted the radial bearing running in contact with the guide groove flank to the nearest top. 10. A pair of endless link devices in which a plurality of link devices each having a clip and a link shaft for gripping both side ends of a thermoplastic resin sheet-like material are connected, and a guide for determining a movement locus of the link shaft. A simultaneous biaxial stretching machine including a rail, a sprocket that engages with the endless link device and drives the endless link device, and a heating source that heats in a region where the thermoplastic resin sheet is stretched was used. In the simultaneous biaxial stretching method, a lubricant that does not cause a dropping point at the heating temperature of the heating source is supplied to all sliding points of the endless link device where sliding occurs with opening and closing of the link. And a simultaneous biaxial stretching method for a sheet material.