JP4882796B2 - Sheet material drawing machine - Google Patents

Description

  The present invention relates to a sheet-like material drawing machine, and more particularly, to a sheet-like material drawing machine that draws a fold-like link device interconnecting sheet-like materials while conveying them on a predetermined path.

  In the sheet-like material drawing machine as described above, an endless link device in which a plurality of foldable link devices that are connected to each other to form a ring is rotationally driven along a specific path has been used. Yes. The substantially rectangular sheet-like material to be stretched is transported and transported to the center of a stretching machine in which endless link devices are arranged on both ends, and the center is held by each link device of the endless link device. In this state, the film is stretched in a predetermined direction that is conveyed toward the outlet side (downstream side).

  In such a sheet-like material drawing machine, each link of the endless link device is determined in advance so as to be positioned on the inlet side (upstream side) where the sheet-like material that is in the predetermined path shape and is not drawn is conveyed. After holding one end of the sheet-like object to be stretched at the spot, the distance between each link device is increased while holding the end of the sheet-like article as it is conveyed along this path, and the sheet-like article is stretched. The structure which performs is provided.

  After performing this stretching, each link device releases the held sheet-like material at a predetermined location, and then returns to the original position along the above-described path and has not been stretched. The above-mentioned lap is carried out while holding this part again. Each of the link devices has a gripping device for holding and releasing the sheet-like material on the circuit route at a position facing the end of the sheet-like material.

  For example, Japanese Patent Application Laid-Open No. 2004-322365 (Patent Document 1) and Japanese Patent Application Laid-Open Publication No. 2004-2004 disclose conventional techniques for a sheet-like material drawing device that draws a sheet-like material while rotating a link device having such a gripping device. No. 322367 (Patent Document 2).

  In the above-described prior art, the gripping device disposed at the front end of each link device on the sheet-like object side travels on the closed path of the endless link while moving the sheet-like object along the route, and the sheet-like object Then, the gripping device releases the sheet-like material at a predetermined position and returns to the original position of the endless link path. The released sheet-like material is transported to the downstream side along the direction in which it has been transported and taken out.

  This gripping device is pivotally supported at the center portion of the lever, and an urging means such as a spring is connected to the upper end side of the shaft, and upper and lower grippers for holding the sheet-like material from above and below are arranged on the lower end side. . By changing the position by applying an external force to the upper end of the lever, the upper gripper connected to the lever is rotated around the axis, the gripper is opened and closed, the interval is increased or decreased, and the sheet is moved between the upper and lower grippers. Hold or release.

JP 2004-322365 A JP 2004-322367 A

  The upper gripper that performs such an operation moves and opens and closes on a path that draws a substantially circumference around the axis in accordance with the movement of the lever that rotates around the axis. For this reason, the upper gripper moves along the surface direction of the sheet-like object immediately before the gripper holds the sheet-like object, and the upper and lower gripping surfaces contacting the sheet-like surface of the gripper are Otherwise, when the upper and lower grips are closed, there is a risk of damage such as scratching or eventually breaking the sheet-like material at the outer edge of the gripping surface.

  In order to suppress this, the upper gripper is pivotally supported at the lower end of the lever so that it can be rotated around this axis. There are known ones configured such that the gripping surfaces are parallel. On the other hand, when a gripping member that rotates at the lower end of the rotating lever is provided, it is necessary to accurately maintain the posture of the gripping member.

  That is, even when the gripping device is configured to be parallel when the gripping device is closed, the gripping surface of the upper gripper is oriented in the direction opposite to the direction approaching the sheet-like object. In some cases, it becomes impossible to form a sheet that securely sandwiches the sheet-like material, and there arises a problem that the stretching is locally insufficient or not performed at that location.

  Since the gripper swings as the lever rotates, in order to reduce the swing, the gripper is enlarged or the gripper posture is limited to a predetermined position. It is conceivable to arrange a position control device such as a stopper. When the gripper is enlarged, it is desirable to increase the range when the above-mentioned damage of the sheet-like material occurs and to make it as small as possible. On the other hand, reducing the size of the grip leads to an increase in the magnitude of the swing, and the above-described prior art has not sufficiently considered that a configuration for realizing the posture more reliably is required.

  An object of the present invention is to provide a highly reliable sheet drawing machine that suppresses damage to the sheet.

The object is to provide a sheet-like object in which endless link devices in which a plurality of connected link-like link devices run around a predetermined route are arranged relative to each other and are supplied between the endless link devices. Is held by the link device and stretched as the route travels, and then the sheet-like material stretching machine opens the sheet-like material, and is disposed at the tip of the link device on the sheet-like material side, an arm extending in the vertical direction, a rotation shaft for pivotally supporting to rotate the arm in a direction and the opposite direction thereof of the sheet, gripping onto which is arranged to be connected to the lower end of said arm and child, the sheet said in accordance with the rotation of the arm has a lower gripping element abutting on said gripping element is sandwiched between the arranged below the sheet of the arm gripping on the Between the child and the lower grabber And it held or grabbed perform opening device, a biasing member having two curved portions for holding the upper gripping element and said on gripping element surface mounted abutting said arm, disposed at a lower end portion of the arm And a shaft for pivotally supporting the upper gripper with respect to the arm. The upper gripper has two surfaces, a side surface on the side opposite to the sheet and an upper surface adjacent to the upper side of the shaft. And the two bending portions of the urging member abut against each of the two surfaces of the upper gripping element so as to maintain the posture of the upper gripping element. Is achieved.

  Furthermore, in a state where the upper gripper is in contact with the curved portion of the urging member, the lower gripper and the sheet-like object are sandwiched at an angle opened toward the center of the sheet-like object. Achieved by touching.

  Furthermore, this is achieved by the fact that the urging member is constituted by a leaf spring attached to the opposite side surface of the sheet-like material across the rotation shaft of the arm.

  Embodiments of the present invention will be described below with reference to the drawings.

  Embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a top view showing an outline of the configuration of a sheet-like material drawing machine of the present invention.

  The sheet-like material drawing machine (hereinafter referred to as drawing machine) 100 according to the present embodiment is provided with a conveyance space 102 for conveying the sheet-like material 101 from the left to the right in the drawing, and the sheet-like material 101 or the conveyance space. Endless link devices 103 and 104 that extend in a predetermined direction while holding both ends of the sheet-like material 101 are disposed on both ends in the left and right (up and down in the drawing) direction of 102.

In the figure, endless link devices 103 and 104 are a plurality of link devices connected in an annular shape, and a sprocket 105 arranged inside the ring and linked to each link device to move it around in the transport direction. , 106, 107 and 108, 109, 110 are provided. Further, although not shown, a drive motor connected to at least one of these sprockets for rotationally driving the sprocket is provided. In this embodiment, the sprockets 105 and 106 of the endless link device 103 are disposed adjacent to the upstream side of the sheet-like object 101, and the sprocket 107 is disposed at the downstream end. Similarly, the sprockets 105 and 106 of the endless link 104 are arranged adjacent to the upstream side of the sheet-like object 101, and the sprocket 107 is arranged at the downstream end.

  The path on the side facing the sheet-like object of the conveyance space 102 or the endless link devices 103 and 104 is roughly divided into three parts according to the stretched state of the sheet-like object 101. That is, the pre-heating unit 111 that carries in and holds the sheet-like material 101 that has not been stretched, and the sheet-like material that is located on the downstream side of the pre-heating unit 111 in the conveying direction of the sheet-like material 101 and is pre-heated by the pre-heating unit 111. A stretching unit 112 that extends in the width direction or the conveyance direction while holding the object 101, and a cooling unit 113 that is disposed downstream of the conveyance direction and cools the sheet 101 from the stretching unit 112 while cooling the sheet 101. .

  Further, each endless link 103, 104 faces the sheet-like object 101 and the side opposite to the side (sheet side) that holds the endless link (non-sheet side) reaches the downstream end in the transport direction. , 115 is connected to the sprockets 107, 110 and has a return path that changes its direction in the upstream direction and returns. The endless links 114 and 115 that have moved upstream in the return path are associated with the sprockets 105 and 108, and the distance between the links is adjusted, and the endless links 114 and 115 are associated with the sprockets 106 and 109 and supplied to the preheating unit 111 again. Is done.

  Thus, the endless links 114 and 115 circulate on an annular path in the endless link devices 103 and 104. Further, the circulation paths of the endless links of the endless link devices 103 and 104 are arranged so that the gripping portions of the endless links 114 and 115 are parallel in the preheating unit 111 that grips the sheet-like object 101 and starts conveyance. Has been. Further, in the extending portion 112 that extends the sheet-like material 101, the circulation path is such that each link device of the endless links 114 and 115 moves in a divergent shape, and further, the downstream cooling unit 113 moves in parallel again. Is arranged.

  Further, above the link device on the sheet side of the sprockets 106 and 109, which is the inlet side of the sheet-like material 101 of the preheating unit 111, a pusher for operating a gripping device that is provided in each link device and grips the sheet-like material. Plates 116 and 117 are arranged. Further, on the downstream end of the cooling unit 113 and above the link device on the seat side of the sprockets 107 and 110, there are provided push plates 118 and 119 for operating the gripping device to release the sheet-like object 101.

When the sheet-like material 101 to be stretched is conveyed to the entrance side of the conveyance space 102 between the endless link devices 103 and 104 around which the endless links 114 and 115 circulate, in the preheating unit 111, the pressing plates 116, It is gripped by the gripping device of each link device that is opened and closed by 117, and is transported to the exit side of the transport space 102 by the movement in the downstream direction.

  When the sheet-like material is conveyed to the extending portion 112 where the circulation path of the endless links 114 and 115 is widened toward the end, the sheet-like material is extended in the width direction of the sheet-like material. Furthermore, in the present embodiment, the distance between the gripping devices of the link devices of the endless links 114 and 115 is widened in the stretching portion 112, and the sheet-like material is stretched also in the direction of the circulation path. That is, in the extending portion 112, the sheet-like material is extended in two directions, that is, the conveyance direction and the width direction.

  FIG. 2 is a top view and a side view schematically showing the configuration of each link device of the endless link according to the embodiment shown in FIG. 2A is a top view of the link device 200, and FIG. 2B is a side view.

  In FIG. 2, the link device 200 is broadly divided into upper and lower equal-length links 201 connected in a folded scale shape and a gripping device 202 disposed on the sheet side of the equal-length links 201. The isometric link 201 is composed of two link arms 204, 205 and 204 ', 205' which are arranged to be vertically spaced apart from each other and three link shafts 206, 206 ', 207 connecting the upper and lower sides, and The chain links 203a and 203b are connected to the link shafts 206 and 206 ′ to limit the maximum pitch of the isometric links 202.

  Although not shown, the link shafts 206 and 206 ′ are connected to the equal-length link 201 of the adjacent link device 200 and are shared by both. In addition, as a link structure of the endless link apparatus 4 or 5, the endless link apparatus described in Japanese Patent Publication No. 5-4896 can be referred to.

  The link arms 204 and 205 constituting the isometric link 201 are coaxially connected on the link shaft 207, and both of them rotate around the axis so that the shape of the isometric link 201 is formed. Change. Further, the link arms 204 and 205 are connected to the link shafts 206 and 206 ′ at the end on the opposite side of the sheet, and are connected to the link arms 204 ′ and 205 at the lower part of the link shaft 207. For this reason, the upper and lower links are deformed synchronously so as to have the same shape during the deformation.

  Below each of the link shafts 206, 206 ′ and 207, the link device 200 is provided with rails 208 and 209 that constitute the above-described circulation path. For this reason, the link device 200 is arranged below the right and left sides of each of the rails 208 and 209 having a rectangular cross section so that the link device 200 is moved along the rails 208 and 209, and rotates in contact with the rails 208 and 209. Bearing rollers 213a, 213b and 214a, 214b are arranged.

  In this way, the gripping device 202 for gripping the sheet-like object 101 is connected above the rail 209 on the seat side of the rails 208 and 209 that causes the link device 200 to travel while gripping the sheet-like object 101 (outer periphery side in the circulation path). The link shaft 207 is disposed, and the link shafts 206 and 206 ′ having no gripping device 202 are disposed above the rail 206 on the side opposite to the seat (inner peripheral side).

  As described above, the grip device 202 is disposed at the sheet side end of the link device 200. The gripping device of the present embodiment includes a gripping arm 210 that is arranged as a continuous member at the sheet-side tip of the link arm 204 ′ and has two arms branched vertically, and a rotation that is connected to the gripping arm 210 and rotates. The sheet 211 is sandwiched between the arm 211 and the upper gripper 212 rotatably connected to the lower end of the rotating arm 211, and the upper gripper 212. And a lower gripper 213 held by

  At the tip of the upper arm of the gripping arm 210, a shaft 214 having an axis in the conveying direction of the sheet-like material 101 (in the drawing, a direction perpendicular to the drawing, substantially horizontal in the present embodiment) is disposed. It penetrates the central portion of the rotating arm 211 and the tip of the upper arm of the gripping arm 210, which are rod-like members extending in the direction (vertical direction of the sheet-like material, in the present embodiment, substantially vertical). A rotating arm 211 rotates around the axis of the shaft 214 so as to move the tip of the grip arm 210 or the link arms 204, 204 to the sheet side / anti-sheet side. Further, a shaft 215 having an axis in the conveying direction of the sheet-like material 101 is disposed at the lower end portion of the rotating arm 211 and penetrates the tip of the rotating arm 211 and the upper gripper 212. Around this shaft 215, the upper gripper 212 rotates to the seat side / anti-sheet side with respect to the rotating arm 211 or the link arms 204, 204 ′.

A coil spring 216 that connects the upper end of the rotating arm 211 and the portion between the shaft 214 and the upper surface of the link arm 204 is disposed so that the rotating arm 211 can rotate around the shaft 214. Is always urged to rotate its lower end toward the seat. For this reason, by applying a force for pressing the upper end of the rotating arm 211 to the seat side by the above-described push plates 116, 117, etc., the rotating arm 211 rotates and arrives at the upper gripper 212 and the lower gripper on the lower end side. When the pressing force is released, the rotating arm 211 is rotated back to the opposite side by the biasing force of the coil spring 216. As a result, the upper gripper 212 and the lower gripper 213 approach each other. Both abut.

In such a configuration, the distance between the rails 208 and 209 of the link device 200 is arranged so as to increase or decrease on the circuit route, and the isometric link 201 rotates around the link shaft 207 along with the movement along these. Move to expand and contract, link arms 204, 204 'and 205,
Increase or decrease the distance between the ends of 205 'on the side opposite the sheet. That is, when the distance between the rails 208 and 209 is reduced, the distance between the front ends of the link arms 204 and 204 ′ and 205 and 205 ′ is increased. As a result, the distance between the link devices 200 connected by the link shafts 206 and 206 ′ is increased. Increase. On the other hand, since the link arms 204, 204 and 205, 205 ′ are connected by the link shaft 207, the distance between the tips of the gripping arms 210 of the gripping device 202 disposed at the sheet-side tip of the link shaft 207 also increases.

  For this reason, in the sheet-like object 101 held by the gripping device 202, the interval between the held parts is increased, and the sheet-like object 101 having elasticity is stretched in the increasing direction. On the other hand, when the distance between the rails 208 and 209 increases, the distance between the opposite ends of the link arms 204, 204 ′ and 205, 205 ′ in the equal-length link 201 decreases, and the grip arms 210 or the sheet-like object The interval between the portions held by the gripping device 202 of 101 is also reduced.

In the drawing machine 100 of the present embodiment, on the inlet side (preheating unit 111) of the conveyance space 102, each link that has been transported in spite of sprockets 105, 108 and 106, 109 rotating around upper and lower axes (not shown). A force is applied to the upper end portion of the rotating arm 211 arranged in the gripping device 202 of the device 200 to advance it, and after opening the space between the upper gripper 212 and the lower gripper 213, the link device 200 is moved. The sheet-like material 101 conveyed in this manner is positioned between them. Thereafter, the advance of the rotating arm 211 is returned to the original position, and the distance between the upper gripper 212 and the lower gripper 213 at the lower end is approached and brought into contact, and the end of the sheet-like object 101 is gripped by the gripping device 202. Hold it.

  While maintaining the gripping of the sheet-like material 101, the link device 200 is moved along the circulation path, and the sheet-like material 101 is conveyed to the extending portion 112. In the extending portion 112, the rails 208 and 209 constituting the circulation path are bent to the opposite side of the sheet, and the rails 208 and 209 facing both ends of the sheet-like object 101 are opposite to each other in the conveying direction of the sheet-like object 101. It is arranged in a divergent shape. For this reason, the sheet-like object 101 held by the link device 200 moving on such a circulation path is stretched in the direction of both ends of the sheet-like object.

  Furthermore, in the present embodiment, the distance between the rails 208 and 209 is reduced and narrowed in the extending part 112 than the distance in the preheating part 111, and the distance between the link devices 200 is also increased. As a result, the sheet 101 is stretched in the transport direction of the rails 208 and 209 or the link device 200.

Thereafter, the link device 200 is moved to the cooling unit 113 while holding the sheet-like material 101. In the cooling unit 113, the circulation paths between the link devices 103 and 104 on both ends of the sheet-like object 101 are arranged in parallel, and the rails 208 and 209 are also arranged in parallel at intervals at the exit of the extending unit 113. Therefore, the temperature of the sheet-like object 101 held by the gripping device 202 is lowered in the cooling unit 113 while maintaining the distance between both ends and the distance between the link devices 200 or the distance between the portions held by the gripping device 202. It is done.

  At the downstream end of the cooling unit 113, similarly to the inlet portion of the preheating unit 111, a force is applied to the upper end of the rotating arm 211 to bring the rotating arm 211 forward, and the space between the upper gripper 212 and the lower gripper 213. By separating, the sheet-like object 101 and the gripping device 202 are released. The released sheet 101 continues to move in the transport direction and is unloaded from the stretching machine 100. On the other hand, the link device 200 releases the force applied to the rotating arm 211 after the sheet-like object 101 is released, and again brings the upper gripper 212 and the lower gripper 213 into contact with each other by the force from the coil spring 216. In addition to closing the gap, it is engaged by the sprockets 108 and 110 and transferred along the return path toward the upstream side of the sheet 101. In this manner, the endless links 114 and 115 of the endless link devices 103 and 104 circulate on a predetermined path, and repeat the operation of stretching and releasing while gripping and holding the sheet-like object 101.

  Next, details of the configuration of the gripping device 202 shown in FIG. 2 will be described with reference to FIG. FIG. 3 is an enlarged view for explaining the outline of the configuration of the gripping device shown in FIG. FIG. 3A is a side view, a front view, and a rear view showing the configuration of the gripping device 202 in an enlarged manner. FIG. 3B is a side view illustrating a state in which the upper gripper 212 and the lower gripper 213 are separated from each other.

  As described above, the gripping device 202 includes the turning arm 211 connected to the tip of the upper arm 210a disposed at the tip of the link arm 204 ′ at the seat side by the shaft 214. The upper arm 212 is connected to the lower end of the rotating arm 211 by a shaft 215, and the tip of a coil spring 216 is hooked on a through-hole 302 disposed above the shaft 214 to be connected thereto.

  Further, as shown in FIG. 3A, a lower gripper 213 that contacts the upper gripper 212 is disposed on the upper end of the lower arm 210b at the front end of the gripping arm 210, and the upper gripper 212 has an upper surface. In the state where the upper gripper 212 and the lower gripper 213 are in contact with each other, the end portion of the sheet-like object 101 is sandwiched in parallel between these surfaces. With the upper gripper 212 and the lower gripper 213 in contact with each other, the shaft 214 is positioned on the seat side with respect to the shaft 215 as shown in FIG. A rotational moment due to a biasing force from the coil spring 216 is applied to the rotating arm 211.

  On the other hand, since the upper gripper 212 and the lower gripper 213 are in contact with each other at the gripping surface, a pressing force is applied substantially perpendicularly to the gripping surface. 101 can be held between the upper gripper 212 and the lower gripper 213.

  In addition, a leaf spring 301 is disposed on the surface of the rotating arm 211 of the present embodiment on the side opposite to the sheet side to apply a pressing force against the surface of the upper gripper 212 on the side opposite to the sheet, The upper end portion is fastened to the opposite sheet surface of the rotating arm 211 by a bolt 306. As will be described later, the lower end portion of the leaf spring 301 is rounded toward the upper gripper 212, and the rounded curved portion comes into contact with the upper gripper 212.

FIG. 3B shows a state in which the rotating arm 211 comes into contact with the sheet-side tip of the pressing plate 116 or 117, 118, 119 and is pushed and inclined toward the sheet side as the link device 200 moves. FIG. At the upper end of the rotating arm 211, a roller 303 that contacts the tip plate 307 of the push plate 116 or 117, 118, 119 is disposed. The rotation axis of the roller 303 is arranged along the vertical direction of the rotation arm 211, and the roller 303 rotates with the movement of the link device 200, so that the pressing plate 116 or 117 pressed against the rotation plate 211 or 117,
The frictional force between the tip portions 307 of 118 and 119 is reduced, and the movement of the link device 200 is stabilized.

Further, in a state where the rotating arm 211 is tilted forward in the sheet direction, the upper gripper 212 is separated from the lower gripper 213 on the upper surface of the lower arm 210b on the side opposite to the seat, and there is a space between the two. It is formed. In this state, the upper gripper 212 is pressed by each of the two curved portions 304 and 305 at the lower end of the leaf spring 301 disposed on the surface opposite to the sheet, and these curved portions 304 are pressed. , 305 holds the posture.

  Two sides of the upper gripper 212 on the side opposite to the sheet with the shaft 215 interposed therebetween and the oblique upper surface adjacent thereto are in contact with the curved portions 304 and 305, and the corners between the two surfaces are curved. It is located so that it may enter into the recessed part between the parts 304 and 305, and it is comprised so that it may be pinched | interposed into what is called a curved part 304 and 305. The two surfaces on the side opposite to the seat with respect to the shaft 215 are urged by the curved portions 304 and 305, which are portions of the leaf spring 301, respectively, so that the centrifugal force accompanying the rotation of the rotation arm 211 and the link device 200 Even when an external force such as vibration accompanying traveling is applied, the posture of the upper gripper 212 is securely held, and when the sheet-like object 101 is sandwiched and in contact with the lower gripper 213, each gripping surface is a sheet-like shape. It realizes a state where the angle is formed so as to open to the object (the center side).

At the inlet of the preheating unit 111 and the outlet of the cooling unit 113, the gripping device 202 is
In the state of (b), the unstretched sheet-like object 101 is arranged in the space between the upper grippers 212 and 213, or the stretched sheet-like substance 101 is opened.

  Next, the gripping operation of the sheet-like object 101 of the gripping device 202 will be described in detail with reference to FIG. FIG. 4 is a schematic diagram for explaining a sheet-like object grasping operation of the grasping apparatus shown in FIG.

  FIG. 4A shows a state in which the roller 303 at the upper end of the rotating arm 211 is pushed to the sheet side by the tip 307 of the pressing plate 116 or 117 at the inlet of the preheating unit 111 and the rotating arm 211 is inclined to the sheet side. FIG. In this figure, as described above, the upper gripper 212 at the lower end of the rotating arm 211 is lifted upward on the opposite side of the seat and is brought into contact with the curved portions 304 and 305 of the leaf spring 303 so that the posture is determined. Yes.

  Thereafter, when the distal end portion 307 moves relative to the opposite side of the gripping device 202 with the movement of the link device 200, the rotating arm 211 urged by the coil spring 216 (not shown) Is rotated around the shaft 214 in the counterclockwise direction in FIG. As a result, the upper gripper 212 disposed at the lower end approaches the surface of the sheet-like object 101 disposed above the planar gripping surface of the lower gripper 213. At this time, the posture of the upper gripper 212 is held by the leaf spring 301.

  As a result of further rotation of the rotating arm 211 in the counterclockwise direction, the end of the gripping surface of the upper gripper 212 on the side opposite to the sheet comes into contact with the sheet-like object 101, and the gripping surface of the lower gripper 213. This is sandwiched (FIG. 3B). The gripping surface of the lower gripper 213 has a substantially circular shape whose diameter is larger than the gripping surface of the upper gripper 212, and when the adjacent upper gripper 212 comes into contact with the sheet-like object 101 in between. The end surface of the gripping surface, which is the surface in contact with the upper surface of the sheet-like object 101 of the upper gripper 212, is configured to come into contact with the gripping surface of the lower gripper 213.

  That is, immediately before coming into contact with the sheet-like object 101, the gripping surface of the upper gripper 212 is in a posture facing the sheet-like object center side (the link front end side of the link device 200) with respect to the sheet-like object 101, The end of the gripping surface on the sheet-like object 101 end side (the rail side of the link device 200) is in contact with the upper surface of the sheet-like object 101 so that the sheet-like object 101 is sandwiched between the gripping surface of the lower gripper 213. That posture is maintained.

  In the state of FIG. 4B, the upper gripper 212 is only in contact with the sheet-like object 101 at its end and holds it between the lower gripper 213 and the holding force is small. Moreover, since the surface pressure on the surface of the sheet-like object 101 is large, there is a high risk of damage. In this embodiment, the upper gripper 212 is further rotated counterclockwise so that the sheet-like object 101 is held between the upper gripper 212 and the lower gripper 213 in a counterclockwise direction. 212 is rotated around the shaft 215 in the clockwise direction relative to the rotating arm 211.

  In order to cause such rotation, it is important that the relative posture when the upper gripper 212 and the lower gripper 213 are in contact with each other with the sheet-like object sandwiched (begin to close) is within a predetermined range. . That is, if the angle of the gripping surface of the upper gripper 212 with respect to the gripping surface of the lower gripper 213 becomes too large, even if the rotating arm 211 further rotates after the contact, the upper gripper 212 cannot be rotated. However, there is a problem that the sheet-like object is damaged by sliding the gripping surface of the lower gripper 213.

  In this embodiment, the curved portions 304 and 305 of the leaf spring 301 abut against two adjacent surfaces of the upper gripper 212, whereby the upper gripper 212 is held and the posture is maintained, and the rotation arm 211 rotates. Accordingly, the sheet-like object 101 or the lower gripper 213 is approached on the track. In this posture, the end of the gripping surface of the upper gripper 212 is in contact with the upper surface of the gripping surface of the lower gripper 213 with the sheet-like object 101 interposed therebetween.

  Even if the tip 307 moves away from the roller 303, the rotating arm 211 biased by the coil spring 216 is applied with a moment that rotates counterclockwise around the axis of the shaft 214. The gripper 212 continues to rotate relative to the rotating arm 211 and the lower gripper 213. Then, the sheet-like object 101 is sandwiched between the planar gripping surface and the gripping surface of the lower gripper 213, and is held by surface contact (FIG. 4C). In this embodiment, at this time, the lower curved portion 305 of the leaf spring 301 is in contact with the side surface of the upper gripper 212 on the side opposite to the sheet, and a counterclockwise rotational moment is applied to the upper gripper 212. Since the clockwise rotational moment due to the urging force of the coil spring 216 is larger, the force for pressing the sheet-like object 101 in the vertical direction is maintained.

  At this time, the area of the gripping surface of the upper gripper 212 is made smaller than the area of the gripping surface of the lower gripper 213. In the state shown in FIG. 4C, the upper gripper is located above the inside of the gripping surface of the lower gripper 213. A gripping surface 212 sandwiches the sheet-like object 101. As described above, in this embodiment, the posture of the upper gripper 212 is held by the two curved portions 304 and 305 that are in contact with the upper gripper 212 and the lower gripper 213 and the sheet-like object 101 are sandwiched between them. The upper gripper 212 is prevented from unnecessarily swinging, and the sheet-like object 101 is restrained from being damaged and improperly gripped, and thus the sheet-like object is not properly stretched. The yield of stretching is improved.

It is a top view which shows the outline of a structure of the extending | stretching machine of the sheet-like material of this invention. It is the top view and side view which show the outline of a structure of each link apparatus of the endless link based on the Example shown in FIG. It is an enlarged view explaining the outline of a structure of the grasping apparatus shown in FIG. It is a schematic diagram explaining the holding | grip operation | movement of the sheet-like object of the holding apparatus shown in FIG.

Explanation of symbols

100 Stretching machine 101 Sheet-like material 102 Conveying space 103, 104 Endless link device 105, 106, 107, 108, 109, 110 Sprocket 111 Preheating section 112 Extending section 113 Cooling section 114, 115 Endless links 116, 117, 118, 119 Plate 200 Link device 201 Equal-length link 202 Grip device 203a, 203b Chain link 204, 204 ', 205, 205' Link arm 206, 206 ', 207 Link shaft 208, 209 Rail 210 Grip arm 211 Rotating arm 212 Upper gripper 213 Lower gripper 214, 215 Shaft 216 Coil spring 301 Leaf spring 302 Through hole 303 Roller 304, 305 Bending portion 306 Bolt 307 Tip

Claims (3)

Endless link devices in which a plurality of connected link-like link devices travel around a predetermined route and are circulated are arranged relative to each other, and the sheet-like material supplied between these endless link devices is used as the link device. A sheet-like material drawing machine that releases the sheet-like material after being held and stretched as the route travels,
An arm that is arranged at the front end of the link device on the sheet-like object side and extends in the vertical direction; and a rotary shaft that pivotally supports the arm so as to rotate in the direction of the sheet-like object and the opposite direction thereof. and Tsukamiko after being connected to and arranged in the lower end portion of the arm, the disposed below the arm has a lower gripping element abutting on said gripping element is sandwiched between the sheet arm A gripping device that holds and releases the sheet-like material between the upper gripper and the lower gripper as it rotates, and abuts on the surface of the upper gripper that is attached to the arm. a biasing member having two curved portions for holding the upper gripping element Te, and a shaft rotatably supported by said on gripping element is disposed at a lower end portion of the arm relative to the arm,
The upper gripper has two surfaces, a side surface on the opposite side of the sheet and the upper surface adjacent to the upper side of the shaft, and the two curved portions of the biasing member maintain the posture of the upper gripper. A sheet-like material stretching machine , wherein the sheet-shaped material is urged in contact with each of the two surfaces of the upper gripper . In a state where the upper gripper is in contact with the curved portion of the urging member, the lower gripper is in contact with the sheet-like object with an angle opened toward the center of the sheet-like object. Item 2. A sheet-like material stretching machine according to Item 1. The sheet-like material stretching machine according to claim 1 or 2, wherein the urging member is configured by a leaf spring attached to a side surface on the opposite side of the sheet-like material across the rotation shaft of the arm .

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