JP4321281B2 - Sheet material drawing machine - Google Patents

Description

  The present invention relates to a stretching machine for stretching a sheet-like material such as a thermoplastic resin film.

  As a conventional gripping device for a sheet-like drawing machine, JP-A-62-44426 discloses a clip body for holding or releasing a sheet-like object and holding the state in a swingable manner on the clip body. A clip lever having a permanent magnet fixed to the top thereof, a clip closer having a magnetic pole repelling the permanent magnet, and a clip opener, wherein the swing of the clip lever is driven by a magnetic repulsive force. It is described that the sheet-like object is gripped or released.

JP 62-44426 A

  However, the gripping device described in Patent Document 1 moves the sheet-like object in the width direction of the sheet-like object at the time of grasping the sheet-like object because the grasper moves substantially parallel to the surface of the sheet-like object. There is a high probability that the center of the object will bend and temperature spots and stretch spots will occur during heating. Moreover, it is thought that it also affects the precision of a draw ratio.

  An object of the present invention is to provide a gripping device for stretching a sheet-like material that prevents the occurrence of deviation of the sheet-like material and that opens and closes without contact with the opening / closing guide to prevent the generation of wear powder and improves the yield of the product. There is to do.

  In order to achieve the above object, the present invention comprises endless link devices configured by connecting a plurality of isometric link devices formed in a fold shape on both sides of a sheet-like material, A sheet that grips an end portion of a sheet-like object with a gripping device provided at an inner end, and is extended by extending the sheet-like object by being guided by guide rails arranged so that the link shaft of the equal-length link device spreads in the direction of travel. In the gripping device, the opening and closing direction of the upper gripper with respect to the lower gripper is configured so that the opening and closing direction of the upper gripper is substantially perpendicular to the surface of the sheet-like object. Magnet means for opening the upper gripper relative to the lower gripper using magnetic force without contact with the guide, and the sheet inserted between the lower gripper and the upper gripper being closed. Spring force to grip the edge of the object Characterized in that a given unit.

  Further, the present invention is characterized in that in the gripping device, a spring is provided inside a cylindrical member attached to the support arm, a magnet is provided at the upper part, and a piston is formed by connecting an upper gripper at the lower part.

  Further, the present invention is characterized in that the cylindrical member is pivotally attached to a support arm in a state in which the cylindrical member can swing in the width direction of the sheet-like material.

  According to the present invention, when the gripping device grips the end of the sheet-like material, the sheet-like material is not displaced, and the gripping device can be opened and closed without contact with the open / close guide, thereby preventing generation of wear powder. This has the effect of improving the product yield.

  An embodiment of a gripping device in a sheet-like material drawing machine according to the present invention will be described with reference to the drawings.

  That is, the present invention aims to perform opening and closing of the gripping device in the sheet drawing machine in a non-contact manner with the opening and closing guide, without impairing the gripping force inherent to the gripping device, and when film gripping the film. Realized without moving in the width direction.

  First, an embodiment of a sheet-like material drawing machine according to the present invention will be described with reference to FIGS.

  FIG. 1 is a plan view of a simultaneous biaxial stretching machine according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of an isometric link 31. Its configuration and operation are as follows.

  An endless link device 3 having a plurality of gripping devices 2 for gripping the ends of the thermoplastic resin sheet-like material 1 on both sides of the sheet-like material 1 (a part of the links and endless links on one side are omitted in the figure) A plurality of isometric links 31 formed in a fold shape are connected to each other. Furthermore, the endless link device 3 is driven by an inlet-side sprocket 4 of a sheet-like material. The gripping device 2 is opened and closed by a spring force by the action of the magnet 101 installed in the opening / closing guide 10 provided at the entrance and the magnet 204 (details of the operation will be described later) installed in the gripping device 2. The end of the sheet-like material 1 is gripped and heated to a temperature necessary for stretching in the preheating section. After that, the endless link device 3 is guided by the guide rails 5 to 7 arranged in a divergent shape in the traveling direction so that the isometric link device 31 is opened and the gripping pitch of the gripping device 2 is gradually increased from P1 to P2. Thus, the sheet-like material 1 is simultaneously stretched in two directions, in the vertical and horizontal directions, and then heat-set at a predetermined temperature in the heat treatment section and rapidly cooled in the cooling section. Then, the sheet-like object 1 is removed by the action of the magnets 111 installed in the opening / closing guide 11 provided at the outlet and the magnets 204 (details of the operation will be described later) installed in the gripping device 2, and the removed sheet-like material is removed. Object 1 will proceed as it is. Further, the endless link device 3 is configured to be driven by the outlet side sprocket 8 and return to the inlet side sprocket 4.

  The guide rails 5 to 7 are a pair of guide grooves, and a gripping device for gripping the sheet-like object 1 in the guide groove formed by the sheet-side guide 5 and the intermediate guide 6 closer to the sheet-like object 1. 2 is held via a bearing roller 9a. A link shaft 13 (FIG. 2) having no gripping device 2 is held via a bearing roller 9b in a guide groove formed by the other anti-sheet side guide 7 and the intermediate guide 6, and the link shafts 12 and 13 are linked. Connected by plates 14 and 15. For this reason, the gripping device 2 is connected to every other folding part of the link. That is, the gripping device 2 is provided at the inner end of the link plate 15 constituting the isometric link device 31 formed in a fold shape. Note that chain links 25 a and 25 b that limit the maximum pitch of the equal-length link device 31 in the endless link device 3 are provided between the adjacent link shafts 13.

  Next, the configuration and operation of the first embodiment of the gripping device according to the present invention will be described with reference to FIG.

  The gripping device 2 is replaceably attached to the inner end of the link plate 15 that is a constituent member of the isometric link 31. The gripping device 2 includes an extension portion 151 on the extension of the link plate 15 and a support arm 152 that is integrally supported by the extension portion 151, and a cover (tubular shape) fixed to the support arm 152. A piston (which is configured to be movable in a direction substantially perpendicular to the surface of the sheet-like object 1) 205, and an upper gripper 202 is connected to the lower end of the piston 205; The sheet-like object 1 is configured to be sandwiched between the child 202 and the lower gripper 203 fixed to the extension 151. The cover 201 has a collar 205a fixed inside. The piston 205 has a magnet 204 at the top, an upper gripper 202 at the bottom, and a collar 205a fixed in the middle. 206 is an insertion spring (spring force applying means) for applying a gripping force (closing force) for gripping the end of the sheet-like object 1 between the lower gripper 203 and the upper gripper 202. It is inserted between the collar 201a of the 201 and the collar 205a of the piston 205.

  A method for attaching and detaching the sheet-like object 1 is that when the isometric link 31 passes through the opening / closing guide 10 installed on the inlet sprocket 4 side, the magnet 101 installed in the opening / closing guide 10 and a grip having a different polarity from the magnet 101. When the magnets 204 of the device 2 are opposed to each other, the two magnets attract each other, and the piston 205 moves upward while compressing the insertion spring 206. As a result, the upper gripper 202 rises in a direction substantially perpendicular to the surface of the sheet-like object 1 with respect to the lower gripper 203 to increase the interval, and after passing through the opening / closing guide 10, the spring force of the insertion spring 206 Restore to the state. During this series of operations, the sheet-like object 1 is inserted while being advanced, so that the sheet-like object 1 is held between the gripping devices 2 and held by the above-described insertion spring force. It will be stretched. On the other hand, when the opening / closing guide 11 installed on the outlet sprocket 5 side and the isometric link 31 pass, the magnet 111 installed in the opening / closing guide 11 and the magnet 204 installed in the gripping device 2 are operated similarly to the above. The piston 205 operates and the upper and lower gripper 202 is released. As a result, the sheet-like object 1 is detached, and the isometric link 31 is restored to the original state after passing through the open / close guide 11. Thus, the magnet 101 installed in the opening / closing guide 10 and the magnet 204 of the piston 205 constitute a magnet means for opening the upper gripper 202 with respect to the lower gripper 203. Further, the internal spring 206 constitutes spring force applying means for closing the upper gripper 202 with respect to the lower gripper 203 and gripping and gripping the end of the sheet-like material 1 inserted therebetween.

  According to the present embodiment, since the gripping device 2 can be opened and closed without contact, wear powder does not occur and the yield of product sheets can be improved. Further, since the upper gripper 202 moves substantially perpendicular to the surface of the sheet-like object 1, the sheet-like object 1 is not moved in the width direction of the sheet-like object when the sheet-like object is grasped.

  In addition, although a present Example is described regarding the example which opens and closes between the upper and lower gripper 202,203 when the magnets 101 and 111 installed in the opening-and-closing guides 10 and 11 and the magnet 204 of the gripping apparatus 2 attract | suck. When gripping the sheet-like material, it is possible to always apply a repulsive force with the magnet 204 between the magnet attached to the cover 201 and increase the pressing force of the sheet-like material 1. The magnets 101 and 111 that are fixedly installed on the open / close guides 10 and 11 include not only permanent magnets but also electromagnets.

  Next, a second embodiment of the gripping device according to the present invention will be described with reference to FIG.

  In the second embodiment of the present invention, the difference from the first embodiment is that the cover (tubular member) 201 is supported so as to be swingable in the width direction of the sheet-like object, as shown in FIG. The upper gripper 207 is pivotally attached to the arm 152 and connected to the lower end of the piston 205 and provided with a stopper 207a for suppressing swinging to the seat side.

  According to the second embodiment, the gripping force of the sheet-like material is enhanced by the self-tightening action of the swinging caused by the tensile force of the sheet-like material 1. In addition, although the piston 205 and the upper gripper 202 are integrated in this figure, the upper gripper can be obtained even if the angle between the central axis of the piston 205 and the surface of the sheet-like object 1 is not vertical by connecting the pins together. The pressing surface of the child 202 and the surface of the sheet-like object 1 can be made parallel. Also, it is not a structure like the upper gripper 207, but a sheet-like shape using a gripper in which the cross section of the contact portion between the upper gripper and the lower gripper is composed of two surfaces, a horizontal surface on the sheet side and an inclined surface on the anti-sheet side. The gripping force can be increased by bending and gripping an object. Further, by connecting the swinging cover 201 and the support arm 152 with a spring, it is possible to provide a boosting effect by the spring.

It is a top view of the simultaneous biaxial stretching machine which is one embodiment of the sheet-like material concerning the present invention. It is sectional drawing of the isometric link shown in FIG. It is explanatory drawing which showed the opening-and-closing method in 1st Example of the grasping apparatus which concerns on this invention. It is explanatory drawing which showed the opening / closing method in 2nd Example of the grasping apparatus which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sheet-like object, 2 ... Grab apparatus, 9a, 9b ... Bearing roller, 10 ... Entrance side opening / closing guide, 11 ... Outlet side opening / closing guide, 31 ... Equal-length link, 101 ... Entrance side opening / closing guide magnet, 111 ... Outlet Side opening / closing guide magnets, 151 ... extensions, 152 ... support arms, 201 ... covers, 202 ... upper grippers, 203 ... lower grippers, 204 ... magnets for gripping devices, 205 ... pistons, 206 ... insertion springs, 207 ... upper grabber, 207a ... stopper.

Claims (3)

An endless link device constituted by connecting a plurality of equal length link devices formed in a fold-like shape is provided on both sides of the sheet-like material, and the sheet-like material is provided by a gripping device provided at an inner end of the equal length link device. A sheet-like material drawing machine that draws the sheet-like material by being guided by guide rails arranged so that the link shaft of the equal-length link device spreads in the direction of travel.
In the gripping device, the upper gripper is opened and closed with respect to the lower gripper so that the opening and closing direction is substantially perpendicular to the surface of the sheet-like material. And a magnet means for opening the upper gripper with respect to the lower gripper, and closing the upper gripper with respect to the lower gripper and gripping and gripping the end of the sheet-like material inserted therebetween. A sheet-like material drawing machine comprising a spring force applying means. 2. The sheet-like object according to claim 1, wherein a spring is provided in a cylindrical member attached to a support arm in the gripping device, a magnet is provided in an upper part, and a piston in which the upper gripper is connected in a lower part. Stretching machine. The sheet-like material drawing machine according to claim 2, wherein the cylindrical member is pivotally attached to the support arm in a state in which the cylindrical member can swing in the width direction of the sheet-like material.

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