JP3484052B2 - Simultaneous biaxial stretching machine apparatus and method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like material simultaneous biaxial stretching machine for continuously stretching a thermoplastic resin film or the like simultaneously in the machine direction and the transverse direction.

[0002]

2. Description of the Related Art A link device of a conventional simultaneous biaxial stretching machine comprises a thrust bearing which receives its own weight and a roller bearing which rolls in a guide groove, as described in Japanese Patent Laid-Open No. 12957/1992. Further, there is an example in which the transverse stretching machine is composed of a rolling bearing that runs under its own weight and a bearing that rolls along a guide rail as described in Japanese Utility Model Laid-Open No. 62-147520.

[0003]

In the sliding traveling as seen in the above prior art, the sliding resistance on the sliding surface is large in order to support the own weight of the link device, and it is difficult to travel at high speed.

Furthermore, since lubricating oil is required for the sliding parts,
There is a problem that this lubricating oil scatters on the film and causes dirt.

Further, in a system in which a rolling bearing receives its own weight, such as a transverse stretching machine, a mechanically complicated structure is required for traveling in the traveling direction, which is practically difficult to employ. . Therefore, in this method, the traveling direction is fixed.

Therefore, a thrust load acts on the bearing, which causes a problem of the life of the bearing and a problem of wear of the traveling path.

It is an object of the present invention to provide an improved simultaneous biaxial stretching device and method.

Another object of the present invention is to provide a simultaneous biaxial stretching device and method which realizes high speed and stable running.

Yet another object of the present invention is to provide a simultaneous biaxial stretching apparatus and method in which the parts used such as bearings have a longer life.

Yet another object of the present invention is to provide a simultaneous biaxial stretching apparatus and method in which dirt due to oil scattering is reduced.

[0011]

In order to achieve the above object, in the present invention, a sheet-like material which grips both edges of a thermoplastic resin sheet-like material by running of a linking device and stretches simultaneously in two vertical and horizontal directions. In the simultaneous biaxial stretching of the above, a traveling road for traveling is provided at at least two positions of different heights, an upper traveling road and a lower traveling road, and the link device receives its own weight on the upper side and An upper bearing that travels along the lower bearing and a lower bearing that receives its own weight on the lower side and travel along the lower traveling path are provided. Further, these bearings are divided and used depending on the traveling direction or traveling region. The above allocation is
For example, when the link device is in a stretched state, it is traveled by the contact between the lower traveling path and the lower bearing, and when the link device is in a contracted state, it is traveled by the contact between the upper traveling path and the upper bearing. To be done.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the simultaneous biaxial stretching device according to the present invention will be described below with reference to the drawings.

First, the basic structure of the simultaneous biaxial stretching device will be described with reference to FIG. In FIG. 1, 1 is a sheet-like material, and 3 is an endless link device for gripping the sheet-like material and guiding it from the inlet side to the outlet portion. The sheet 1 is a clip 2 of an endless link device 3 driven by sprockets 7, 8 and 9.
Thus, both side edges are gripped and simultaneously stretched in two directions. That is, the sheet-like material 1 is continuously advanced in the direction of the arrow M while holding both side edges of the sheet-like material 1 by the clip 2 and sequentially passes through the sections A, B, C, D, E and F. The sheet 1 is heated in the sections A (preheating), B (stretching), and C (fixing heat treatment), and cooled in the section D.
In the section B, the lower guide rails 4, 5 and 6 for guiding the endless link device 3 spread toward the end, that is, the sheet-like material 1
Since it is also expanded in the width direction of the above, in this section B, it is simultaneously stretched in the vertical and horizontal directions. In the section C, the stretched sheet-like material 1 is heat-treated, and in the latter half of the section C, the sheet-like material 1 contracts to some extent and becomes stable. After passing through the section D, the sheet-like material 1 is taken up by the subsequent winding machine. The endless link device 3 contracts in the section F and is driven endlessly.

The lower guide rails 4, 5 and 6 for restricting the traveling of the endless link device 3 are provided in the entire traveling section, and the upper guide rail 10 is provided in the intermediate section of the section F to the intermediate section of the section B. The upper guide rail 10
When traveling along, the link device 3 moves toward the upper guide rail 10
The lower guide rails 4, 5 and 6 are not necessarily required in the section in which the upper guide rail 10 is arranged because they are suspended from the lower guide rails 4, 5 and 6.

FIG. 2 is a plan view of the link device 3 in the section A, and FIG. 4 is a plan view of the link device 3 in the section B and subsequent sections.

As the sheet 1 is stretched, the so-called link opening angle (the traveling direction (arrow M) and the link plate 1)
Since the angle θ formed with the core of 1 (center line 11A) changes from θ1 to θ2, the difference, that is, (θ2−θ1) changes. That is, when the traveling device is mounted on the bearing support fixed to the link plate 11, the bearing runs while slipping with the angle difference deviated. The larger the difference is, the larger the deformation force or frictional force is applied to the bearing and the guide rail, and the life is reduced. Since the difference becomes large in the section from the middle of the link contracting section F to the middle of the extending section B, the upper guide rail 10 is provided in this section, and the driving is switched to the one suitable for the contracted state of the link. In order to switch the drive state, the link plate 11 has an upper rolling roller 12 for receiving the own weight of the link device 3 on the upper side, and a lower end of the link shaft 13 for receiving the own weight of the link device 3 on the lower side. The rolling roller 14 is attached. That is, the upper rolling roller 12 is along the upper guide rail 10 in the section from the vicinity of the middle of the section F to the vicinity of the middle of the section B in the state where the link is contracted, and the lower rolling roller 14 in the sections other than this section. Is rotated along the lower guide rails 4, 5, 6, the link device 3 is in a suspended state when moving along the upper guide rail 10, and the lower guide rails 4, 5, 6
When moving along, it is placed. Therefore,
Since the link device 3 is driven by the rotation of the upper rolling roller 12 or the lower rolling roller 14 in the entire section, the traveling resistance is small and stable high speed traveling is possible. As a result, lubricating oil is not required on the traveling path. No oil stains.

The direction of the upper rolling roller 12 is set in the traveling direction when the link device 3 is contracted (FIG. 2).
In this case, the direction of the lower rolling roller 14 is largely deviated from the traveling direction, but when traveling in this state, the lower rolling roller 14
Since the rail 10 height is set so as to have a slight gap G so as not to contact with the bed 15, no friction or the like occurs between the lower rolling roller 14 and the bed 15. This state is shown in FIG. In order to stabilize the running in the suspended state, as shown in FIG.
It is preferable to provide a pair of upper guide rails 10 so as to sandwich the upper and lower guide rails 10 vertically.

From the vicinity of the center of the extension section B to the vicinity of the center of the contraction section F, the rail 10 is not installed and the bed 15 is run. The direction of the lower rolling roller 14 is set to the traveling direction when the link device 3 is in the expanded state (FIG. 4). Although the direction of the upper rotating roller 12 is largely deviated from the traveling direction, in this case, the link device 3 is driven by the lower rolling roller 14, and the upper rotating roller 12 does not contribute to the driving of the link device 3, so there is no obstacle due to this deviation. Does not happen. A radial bearing 16 is installed on the upper part of the lower rolling roller 14, and the bearing 16 is guided in the groove between the guide rails 4, 5, and 6 to perform a prescribed traveling on a road.

According to the present invention, since the running system is rolling rather than sliding, running resistance is small and stable high speed running is possible, and lubricating oil is not required on the running path, and the problem of oil stains is solved. To do. Furthermore, since the rolling rollers are oriented in the traveling direction, thrust load does not act, and therefore, the life of the bearing and the traveling path can be extended.

[Brief description of drawings]

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

FIG. 2 is a plan view of a link device during traveling in a preheating section.

FIG. 3 is a vertical cross-sectional view of a link device during traveling in a preheating section.

FIG. 4 is a plan view of the link device during traveling after the extension section.

FIG. 5 is a vertical cross-sectional view of the link device during traveling after the stretching section.

[Explanation of symbols]

1 ... Sheet-like material, 2 ... Clip, 3 ... Link device, 4,
5, 6 ... Lower guide rail, 7, 8, 9 ... Link drive sprocket, 10 ... Upper guide rail, 11 ... Link plate, 12 ... Upper rolling roller, 13 ... Link shaft, 14 ... Lower rolling roller, 15 ... bed, 16 ... radial bearing.

Front page continuation (72) Inventor Junichi Kanamoto 794 Higashitoyoi, Kudamatsu City, Yamaguchi Prefecture Inside the Kasado Works, Hitachi Techno Engineering Co., Ltd. (56) Reference JP 4-12957 (JP, A) JP JP 4-140125 (JP, A) JP-A-4-141409 (JP, A) JP-A-6-210726 (JP, A) JP-A-6-210727 (JP, A) JP-A-6-278204 (JP, A) JP-A-10-249934 (JP, A) JP-A-11-170360 (JP, A) JP-A-54-86181 (JP, A) JP-A-56-56450 (JP, A) JP-A-61 -47233 (JP, A) JP-A-63-42839 (JP, A) JP-A-63-87462 (JP, A) JP-A-63-179726 (JP, A) Actual Kaihei 4-135317 (JP, U) ) Actually open 6-34931 (JP, U) Actually open 48-107861 (JP, U) Actually open 49-42284 (JP, U) Actually open 53-177 (JP, U) Actually open 55- 151517 (JP, U) Actual opening Sho 59-126618 (JP, U) Actual opening Sho 62 147520 (JP, U) Tokuoyake Akira 44-21517 (JP, B1) (58 ) investigated the field (Int.Cl. ^7, DB name) B29C 55/00 - 55/30 B65H 20/00 - 20/40 B65H 23/00-23/34

Claims (5)

(57) [Claims] 1. A plurality of isometric link devices formed in a folding scale.
And a plurality of gripping devices for gripping both side ends of the thermoplastic resin sheet-like object are arranged at both side ends of the sheet-like object. The device is driven by a sprocket on the inlet side of the sheet-like object, and is guided by guide rails arranged in a divergent shape in the direction of movement to gradually increase the gripping pitch, so that the sheet-like object can be vertically and horizontally extended. is stretched simultaneously, the following disconnect the sheet is driven by the outlet side sprocket, in a simultaneous biaxial stretching machine configured sheet to return to the inlet side sprockets, the weight in the upper to the endless link device Two types of traveling devices, a suspension type for receiving and traveling and a bogie type for traveling by receiving its own weight on the lower side, are mounted, and the traveling device is connected to the endless link.
It is used in the traveling zone of the device, and it is a suspension type traveling
A guide rail is installed on the top of the endless link device.
This allows it to run in a floating state, while
The type travel zone is a road that receives its own weight.
A simultaneous biaxial stretching machine for sheet-like materials, which rolls on a pad and runs . 2. A simultaneous biaxial stretching device for a sheet-like material, which grips both edges of a thermoplastic resin sheet-like material and stretches simultaneously in two longitudinal and lateral directions by the running of a link device. An upper traveling path and a lower traveling path provided at the position,
Consists a bearing on traveling along the upper traveling path received in the upper the weight of the link apparatus, a lower bearing which runs along the lower running path receives the lower the weight of the link device
When the above link device is extended
The above-mentioned link device is assumed to run by contact between the road and the lower bearing.
Is contracted, the contact between the upper running path and the upper bearing is
A simultaneous biaxial stretching device characterized by running by touch . 3. The lower traveling path and the lower bearing are in a non-contact state when the link device contracts to travel by contact between the upper traveling path and the upper bearing.
2. The simultaneous biaxial stretching device described in 2 . 4. The simultaneous biaxial stretching device as claimed in claim 2, wherein the upper bearing and the lower bearing are composed of rotating rollers which are in contact with a traveling path and rotate. 5. A method for simultaneously biaxially stretching a sheet-like material, wherein both edges of a thermoplastic resin sheet-like material are gripped by running the linking equipment and stretched simultaneously in two longitudinal and lateral directions. a step of driving in a state of suspended has been, and a step of driving in a state of being placed on the linkage to lower running path, the traveling zone of the link device the two steps
Depending on the type of vehicle, you can use the
Install a guide rail on top of the link device.
Due to this, run in a state of being lifted up, while on the other hand, run down
The zone that is traveling in the process of being placed on the road is traveling under its own weight
A simultaneous biaxial stretching method characterized by rolling and running on a bed which becomes a road .