JPH06210726A - Simultaneous biaxial stretching machine for sheet like article - Google Patents

Abstract

(57) [Summary] [Object] The present invention eliminates the phenomenon that a chain link reversely bends due to aged wear of parts and accumulation of relative dimensional differences when a link device starts MD contraction, and other parts around it. The purpose is to prevent the problem of interference. [Structure] A guide plate 8 having one point supported by a pin 9 is installed on the front side of an MD contraction assisting device 7, and a portion in contact with the link device 2 which reciprocates repeatedly in tandem with the MD contracting assist device 7 is installed. Before the chain link passes through the MD contraction assisting device 7, the guide plate 8 surely pushes the pin connecting portion of the chain link into the inside of the link device 2, and in that state (a state in which the pitch is slightly contracted), the link device 2 Since it passes through the MD contraction assisting device 7, it is a mechanism in which reverse bending cannot occur during MD contraction.

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 simultaneously stretching a sheet material such as a thermoplastic flat film in the machine direction and the transverse direction.

[0002]

2. Description of the Related Art A conventional device is a device for assisting MD shrinkage (in a simultaneous biaxial stretching machine, the link device shrinks in the same direction as the traveling direction), as described in Japanese Patent Laid-Open No. 9582/1990. Although a means for assisting the MD contraction by the guide rail that is installed and forms the traveling path of the link device has been proposed, a device that assists the initial breakage of the link device is surely ensured without the reverse breakage of the link device. There is no suggestion of a method of passing the vehicle in a normal state.

[0003]

In the prior art, since the chain link of the link device has a connecting structure with pins, the link device starts MD contraction and the chain link due to pulsation of the link device during traveling. Due to the coincidence of the timing of the vibrations generated in itself, the chain link may be bent both inside (film side) and outside (anti-film side) at the moment when MD contraction starts, and it is certain that the chain link is normal. Since there is no regulation to bend in the direction (inside), if the chain link bends to the outside (opposite the film side), it interferes with peripheral parts, and there was a problem that the entire device will stop operating and serious damage will occur. .

An object of the present invention is to forcibly orient the bending direction of the chain link in the regular direction (inward) when MD contraction is started.

[0005]

[Means for Solving the Problems] The above object is a device for completing MD contraction by pushing a pin connecting portion of a chain link in a state where MD contraction is very slight (hereinafter referred to as MD contraction assisting device). It is achieved by installing a guide plate that repeats reciprocating motion that gives an external force that folds the fully extended chain link inward (the film side) in conjunction with this MD contraction assist device on the front side of It

[0006]

The guide plate installed according to the present invention has a structure in which one end is fixed by an external force to one end to rotate the guide plate by an arbitrary angle and the other end also rotates by the same angle. When this guide plate is interlocked with the MD contraction assisting device and the pins are sandwiched, the MD contraction assisting device rotates to displace the arbitrary positions on both sides continuously by the same angle. The contacting part repeats reciprocating motion.

Therefore, at the same time when the chain link passes through the position immediately before the MD contraction is started due to the traveling speed of the link device and the angular velocity of the MD contraction assisting device, the guide plate begins to hit the pin portion of the chain link and pushes inwardly, so that it is arbitrary. It will start to return to the original position after moving for a distance of, and will return to the position where it does not interfere when the link shaft part passes, so the chain link itself vibrates while running while it is running. Due to
There is no malfunction of bending outward when MD contraction starts.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view showing a schematic structure of a simultaneous biaxial stretching machine. Both edges of the sheet 1 are gripped by the clip of the lever 3 at the tip of the link device 2, and the link device 2 is simultaneously driven by the drive sprockets 4, 5 and 6 in this state to move. It is stretched.
The link device 2 is MD contracted by the MD contraction assisting device 7 at an arbitrary position in the middle of the drive sprockets 4, 5, and 6.

Details of the MD contraction assisting device 7 are shown in FIGS. 2 and 3, the guide plate 8 according to the present invention is shown.
Explain.

FIG. 2 shows a state when MD contraction is started. The guide plate 8 rotatably supported by the pin 9 is
The pin connecting portion of the chain link of the link device 2 is pushed inward in conjunction with the contraction assisting device 7, whereby the link device 2 passes through the MD contracting assisting device 7 with the link chain folded inside. Will be
MD contraction is performed by moving along a normal trajectory without reverse bending.

FIG. 3 shows a state in which the link device 2 has moved by a half pitch from the state shown in FIG. By rotating the MD contraction assisting device 7 from the state shown in FIG. 2, the MD contraction assisting device 7 pushes an arbitrary point on the side opposite to the contact point with the guide plate 8 in FIG. 8 moves away from the link device 2 and returns to a position where it does not interfere with the running of the link device 2.

As the MD contraction assisting device 7 rotates, the guide plate 8 repeats the reciprocating motion at the positions shown in FIGS.

According to the present embodiment, the chain link of the link device 2 can be surely folded inward before passing through the MD contraction assisting device 7, thus causing problems such as reverse bending. It has the effect of ensuring that the MD contraction is started without any.

[0014]

According to the present invention, damage to parts due to reverse bending of the chain link of the link device that may occur when starting MD contraction, operation stop due to it, and timing deviation between the MD contraction assisting device and the link device. This has the effect of surely eliminating the occurrence of malfunctions that could not be prevented in the past, such as the generation of abnormal noise and damage to parts due to interference, and the resulting operation stoppage.

[Brief description of drawings]

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

FIG. 2 is an enlarged plan view around the link device and the MD contraction assisting device when MD contraction is started.

FIG. 3 is an enlarged plan view showing a state where the link device has moved by a half pitch from the state of FIG.

[Explanation of symbols]

1 ... Sheet-like material, 2 ... Link device, 3 ... Lever, 4,
5, 6, drive sprocket, 7 ... MD contraction assisting device,
8 ... Guide plate, 9 ... Pin.

Front page continuation (72) Inventor Shozo Ishikura 55-533 Ujiinzan, Uji City, Kyoto Prefecture (72) Inventor Yoshiyuki Takamura 794 Azuma Higashitoyoi, Shimomatsu City, Yamaguchi Prefecture Hitachi Ltd., Kasado Plant (72) Inventor Masahiro Fujisaki 794 Azuma Higashi-Toyoi, Kudamatsu City, Yamaguchi Prefecture Hitachi Techno Engineering Co., Ltd. Kasado Plant

Claims (1)

[Claims] 1. A simultaneous biaxial stretching machine for simultaneously stretching a thermoplastic resin sheet material in the longitudinal and transverse directions, which is installed symmetrically and endlessly with respect to the traveling direction of the sheet material, and hinged in a pantograph shape. A seat characterized in that a guide plate that reciprocates so as to push the pin connecting portion of the chain link into the inside of the link device in conjunction with the MD contraction assist device is installed on the running path of the link device composed of long links. Biaxial stretching machine for materials.