JP6033713B2 - Tenter device - Google Patents

Description

  The present invention relates to a tenter device for stretching a substrate such as a film.

  Conventionally, the distance between a pair of left and right tenter rails arranged symmetrically is widened symmetrically toward the carry-out port side from the carry-in port, and the substrate is heated while the substrate is heated between them. A tenter device has been proposed in which the film is stretched laterally (see, for example, Patent Documents 1 and 2). Hereinafter, in the present specification, this tenter apparatus is referred to as “an apparatus for performing transverse stretching”.

  Also, a tenter device has been proposed that stretches the orientation axis of a base material in an oblique direction by traveling between the pair of left and right tenter rails arranged in an oblique direction while the base material is heated (Patent Document 3). reference). Hereinafter, in this specification, this tenter apparatus is referred to as “an apparatus that performs oblique stretching”.

JP 10-337773 A JP-A-10-337774 Japanese Patent Laid-Open No. 2004-9542

  Conventionally, an apparatus for performing transverse stretching and an apparatus for performing oblique stretching have been designed, manufactured, and sold as separate apparatuses. However, recently, in order to reduce the cost of the apparatus, there is a demand for a single tenter apparatus that can be used as an apparatus that performs oblique stretching and an apparatus that performs lateral stretching. That is, in one tenter device, depending on the type of base material to be manufactured, the device that performs transverse stretching is changed to the device that performs oblique stretching, or the device that performs transverse stretching is changed from the device that performs oblique stretching. This is for proper use.

  Therefore, in view of the above problems, an object of the present invention is to provide a tenter device capable of realizing both a device that performs oblique stretching and a device that performs lateral stretching.

  The present invention includes a pair of left and right tenter rails, a pair of left and right endless tenter chains arranged along the pair of left and right tenter rails, chain drive means for moving the pair of left and right tenter chains in the front-rear direction, Supporting the base material from both the left and right sides, provided to the pair of left and right tenter chains at predetermined intervals, and traveling along the pair of left and right tenter rails by moving the pair of left and right tenter chains, A pair of left and right support means for moving the base material from the front to the back, and the pair of left and right tenter rails front and back a plurality of pairs of left and right partial rails and a connecting portion of the adjacent partial rails Connecting and moving means for moving in the direction and left and right direction, and the chain driving means includes the pair of left and right tenter chains, respectively. A pair of left and right drive sprockets; a pair of left and right driven sprockets on which the pair of left and right tenter chains are respectively stretched; drive movement means for moving the pair of left and right drive sprockets in the front-rear direction; and the pair of left and right followers It is a tenter device having driven movement means for moving the sprocket in the front-rear direction and a drive motor for rotating the drive sprocket.

  According to the present invention, by tilting the partial rail at the connecting portion, it is possible to realize both an apparatus that performs oblique stretching and an apparatus that performs lateral stretching.

It is a top view of the tenter apparatus which performs transverse stretching of Embodiment 1. It is a top view of the tenter apparatus which performs diagonal extending | stretching of Embodiment 1. FIG. It is a side view of a driven stand and a drive stand at a carry-in entrance and a carry-out exit. It is a block diagram of a tenter device. It is a top view of the partial rail of a straight state. It is a top view of the partial rail of an inclined state. It is a top view of the connection part in the partial rail of a straight state. It is a top view of the connection part in the partial rail of an inclined state. It is the sectional view on the AA line in FIG. FIG. 8 is a cross-sectional view taken along the line BB in FIG. It is a disassembled perspective view of a front spring board, a back spring board, and a middle spring board. (A) is a side view of the front spring plate in a linear state, (b) is a state in which the first front spring plate and the second front spring plate are farthest apart, and (c) is a side view of the closest state. It is. (A) is a state in which the first back spring plate and the second back spring plate are closest to each other, (b) is in a state of being most distant from each other, and (c) is a side view of the back spring plate in a linear state. . It is a flowchart of the moving method of the drive stand of a tenter apparatus. It is a top view of the tenter apparatus which performs diagonal stretch of Embodiment 2.

  Hereinafter, a tenter device 10 according to an embodiment of the present invention will be described with reference to the drawings.

Embodiment 1

  A tenter device 10 according to a first embodiment will be described with reference to FIGS. The tenter device 10 in the present embodiment is a clip tenter device that grips both sides of a base material with clips.

  In this embodiment, the film F is used as a long substrate. As this film F, thermoplastic resins, such as a polymer film used for a polarizing plate, are mentioned. Examples of the polymer include polyvinyl alcohol, polycarbonate, cellulose acylate, polysulfone and the like. In addition, the film F may be polyester, polyethersulfone, polystyrene, polyolefin, polyvinyl alcohol, cellulose acetate, polyvinyl chloride, polymethyl methacrylate, polyarylate, polyamide, or the like. Further, the film F has an ultraviolet absorbing function like a film treated with an ultraviolet absorbing material such as a salicylic acid ester compound, a benzophenol compound, a benzotriazole compound, a cyanoacrylate compound, or a nickel complex compound. It may be a thing.

  Of these, polycarbonate resins, polystyrene resins, and polynorbornene resins are preferable. Polynorbornene-based resins are particularly preferable because they have a relatively small photoelastic coefficient, are flexible, and are less likely to crack or tear against bending stress or shear stress. The weight average molecular weight of the thermoplastic resin is not particularly limited, and an appropriate one can be used.

  Moreover, the film F of this embodiment shall generate a bowing phenomenon. Whether the film F causes the concave bowing phenomenon or the convex bowing phenomenon varies depending on the type of the film F. Therefore, an experiment is performed in advance to confirm.

(1) Structure of Tenter Device 10 The entire structure of the tenter device 10 will be described with reference to FIGS. The tenter device 10 according to the present embodiment can be changed from the device that performs lateral stretching to a device that performs oblique stretching, or from the device that performs oblique stretching to a device that performs lateral stretching. FIG. 1 is a plan view of an apparatus for performing transverse stretching, and FIG. 2 is a plan view of an apparatus for performing oblique stretching.

  In the following description, it is assumed that the transport path of the tenter device 10 is provided on the xy plane in the xy orthogonal coordinate system, the film F travels on the xy plane (on the horizontal plane), and the front-rear direction is the y axis. The horizontal direction is parallel to the x axis.

  The tenter device 10 includes a pair of left and right tenter rails 16 along the film F conveyance path. A driven sprocket 18 is provided on the carry-in side of the left tenter rail 16, and a drive sprocket 20 is provided on the carry-out side. An endless tenter chain 22 is stretched between the driven sprocket 18 and the drive sprocket 20. The tenter chain 22 is provided with a clip 24 that holds the left ear portion of the film F at predetermined intervals. In FIG. 1 to FIG. 3, the clip 24 is partially omitted. The right tenter rail 16 has a similar structure. The pair of left and right drive sprockets 20 are rotated by a drive motor 26.

  The left tenter rail 16 connects, for example, nine partial rails 28 at connecting portions, and the right tenter rail 16 similarly connects nine partial rails 28 at connecting portions.

  The tenter device 10 can be changed to a device that performs lateral stretching or a device that performs oblique stretching by moving the connecting portion of the partial rail 28 in the y-axis direction (left-right direction).

  As shown in FIG. 1, the lateral stretching apparatus stretches the film F laterally with respect to the sixth pair of left and right tenter rails 16, 16 as the distance from the carry-in entrance to the carry-out exit becomes wider. . The center line C of the pair of left and right partial rails 28 of the apparatus that performs lateral stretching is always parallel to the y-axis.

  As shown in FIG. 2, the apparatus for performing oblique stretching is such that the distance between the fifth and sixth pair of left and right tenter rails 16, 16 increases from the carry-in port to the carry-out port, and to the left and right with respect to the y-axis direction. The center line C of the pair of partial rails 28 is inclined by θ °, and the film F is stretched obliquely. However, 0 ° <θ ° <= 45 °.

  Hereinafter, the structure of each part will be described in detail.

(2) Structure of carry-in port and carry-out port Next, the structure of the tenter device 10 at the carry-in port and the carry-out port of the film F will be described with reference to FIG.

  At the carry-in entrance of the tenter device 10, there are an entrance stand 34 fixed to the floor as follower moving means, a follower stand 30 on the entrance stand 34, and a pair of left and right follower slide plates 31, 31 on the follower stand 30. A pair of left and right driven sprockets 18 and 18 are provided on the pair of left and right driven slide plates 31 and 31, respectively. The driven sprocket 18 rotates as the tenter chain 22 moves. The pair of left and right driven slide plates 31 are arranged on the driven table 30 so as to be independently movable in the left and right directions via the left and right rails 33. As a result, the driven slide plate 31 having the driven sprocket 18 moves independently on the left and right in the left-right direction on the driven table 30 by the driven slide motor 25. The driven table 30 is placed on the entrance table 34 so as to be movable in the front-rear direction via the front-rear rail 32. When the driven sprockets 18 and 18 and the partial rail 28 are pulled rearward, along with the front-rear rail 32 therewith. As a result, the follower 30 moves backward. However, the driven table 30 does not move beyond the front end and the rear end of the front and rear rail 32.

  At the carry-out port of the tenter device 10, there are an exit base 42 fixed to the floor as drive movement means, a drive base 38 on the exit base 42, and a pair of left and right drive slide plates 36, 36 on the drive base 38. And a pair of left and right drive slide plates 36, 36 are provided with a pair of left and right drive sprockets 20, 20, respectively. The drive sprocket 20 is rotated at a predetermined rotation speed by the drive motor 26. The pair of left and right drive slide plates 36 are arranged on the drive base 38 so as to be independently movable in the left and right directions via the left and right rails 40. As a result, the drive slide plate 36 having the drive sprocket 20 is independently moved in the left-right direction on the drive base 38 by the drive slide motor 37. The drive base 38 is disposed on the outlet base 42 so as to be movable in the front-rear direction via the linear way 44. The linear way 44 rotates the male screw rod 48 connected to the positioning motor 46, The drive base 38 is moved in the front-rear direction with respect to the exit base 42.

(3) Structure of connection part Next, the structure of the connection part of the partial rails 28 and 28 is demonstrated based on FIGS. Hereinafter, for easy understanding, one of the adjacent partial rails 28, 28 is expressed as a first partial rail 28, and the other adjacent partial rail 28 is expressed as a second partial rail 28.

  As shown in FIGS. 7 and 8, both the first partial rail 28 and the second partial rail 28 are horizontally arranged, and vertical rails 27, 27 are erected on the left and right sides of the upper surface, and between these vertical rails 27, 27. The flat upper surface of each constitutes a lateral rail 29.

  As shown in FIGS. 7 and 8, shaft holes 50 are opened at both front and rear end portions of the first partial rail 28, and shaft holes 50 are also opened vertically at both front and rear end portions of the second partial rail 28. . As shown in FIG. 7, the connecting shaft 52 vertically penetrates the shaft hole 50 of the first partial rail 28 and the shaft hole 50 of the second partial rail 28, and rotates the first partial rail 28 and the second partial rail 28. It is connected freely.

  As shown in FIGS. 9 and 10, the connecting shaft 52 is erected in a vertical direction from the connecting slide plate 54. The connecting slide plate 54 is movable in the front-rear direction with respect to the connecting table 56. Specifically, as shown in FIGS. 5 and 6, a long hole 58 is provided in the connecting table 56 in the front-rear direction, a protrusion 60 protrudes downward from the connecting slide plate 54, and the protrusion 60 extends along the long hole 58. It is free to move.

  As shown in FIGS. 9 and 10, the coupling table 56 is movable by wheels 64 on a support rail 62 fixed to the floor in the left-right direction. A screw receiving portion 66 in which a female screw portion 67 penetrates in the left-right direction is provided on the lower surface of the coupling base 56, and a male screw portion 68 provided in the left-right direction penetrates the female screw portion 67 of the screw receiving portion 66. Yes. The male screw portion 68 is rotated by a connecting motor 70 that is a connecting table moving means. As a result, the connecting table 56 moves on the support rail 62 in the left-right direction.

  As shown in FIG. 9, the upper surface of the connecting shaft 52 is a flat surface, and is configured to have the same height as the horizontal rail 29 of the partial rail 28.

  Then, when the pair of left and right partial rails 28 as shown in FIGS. 1 and 7 rotate the connecting motor 70 from the straight state, the male screw portion 68 rotates, and the connecting base 56 moves on the support rail 62 in the left-right direction. , The end portion of the first partial rail 28 rotates around the connecting shaft 52 and is inclined with respect to the second partial rail 28. The inclination angle of the partial rail 28 is proportional to the moving distance of the connecting table 56. Further, since the connection motor 70 is a servo motor, the moving distance of the connection base 56 is proportional to the rotation angle of the connection motor 70. Therefore, the inclination angle of the partial rail 28 is proportional to the rotation angle of the connecting motor 70.

(4) Structure of the gap portion between the first partial rail 28 and the second partial rail 28 Next, the structure of the gap portion between the first partial rail 28 and the second partial rail 28 will be described.

  There is a gap between the first partial rail 28 and the second partial rail 28. For this reason, a guide plate 72 that can be bent so as to allow the clip 24 to move also spans the gap portion. This guide plate will be described with reference to FIGS.

  The guide plate 72 has a three-layer structure of a front spring plate 74, a back spring plate 76, and a middle spring plate 78.

  As shown in FIG. 11, the front spring plate 74 includes a first front spring plate 74a and a second front spring plate 74b. As shown in FIG. 12, one end on the carry-in side of the first front spring plate 74a is fixed by a bolt 83, and the other end is a free end. A projecting piece 80 projects in the front-rear direction from the lower portion of the free end of the first front spring plate 74a. On the other hand, one end on the carry-out side of the second front spring plate 74b is fixed by a bolt 83, and the other end is a free end. A U-shaped concave portion 82 into which the protruding piece 80 is inserted is formed in the front-rear direction at the free end of the second front spring plate 74b. The length of the recess 82 in the front-rear direction is formed to be longer than the length of the protrusion 80 in the front-rear direction, and the difference in dimensions allows the protrusion 80 to slide so that the guide plate 72 can be bent. The upper side of the projecting piece 80 at the free end of the first front spring plate 74a and the upper side of the recess 82 of the second front spring plate 74b are pressed and fixed by a pressing plate 84. However, the projecting piece 80 is movable in the front-rear direction with respect to the pressing plate 64.

  As shown in FIG. 11, the back spring plate 76 includes a first back spring plate 76a and a second back spring plate 76b. As shown in FIG. 13, the first back spring plate 76 a has one end on the carry-out side fixed by a bolt 87 and the other end on the carry-in side is a free end. A projecting piece 86 projects in the front-rear direction from the upper part of the free end of the first back spring plate 76a. One end on the carry-out side of the second back spring plate 76b is fixed by a bolt 87, and a U-shaped recess 88 into which the protruding piece 86 is inserted is formed at the other end. As described above, the projecting piece 86 is formed on the upper portion of the first back spring plate 76a, and is formed in a step difference from the projecting piece 80 of the first front spring plate 74a (see FIG. 11). The size of the recess 88 is longer than the size of the projecting piece 86, and the difference in size allows the slide of the projecting piece 86 so that the guide plate 72 can be bent. The lower side of the protruding piece 86, which is a free end, is pressed against and fixed to the lower side of the recess 88 by a pressing plate 90. However, the projecting piece 86 is movable in the front-rear direction with respect to the pressing plate 90.

  As shown in FIG. 11, an intermediate spring plate 78 is sandwiched between the front spring plate 74 and the back spring plate 76 in order to reinforce the strength. However, the length of the middle spring plate 78 in the front-rear direction is shorter than the lengths of the front spring plate 74 and the back spring plate 76.

  Even when the guide plate 72 is in a straight line state as shown in FIG. 7 due to the difference in the dimensions of the protrusions 80 and the recesses 82 and the difference in the dimensions of the protrusions 86 and the recesses 88 as shown in FIG. As shown, even when the guide plate 72 is curved, the gap between the first partial rail 28 and the second partial rail 28 can be connected by sliding the protruding piece 86 and the recessed portion 88 and the protruding piece 80 and the recessed portion 82.

(5) Structure of Clip 24 Next, the structure of the clip 24 that is a supporting means for the film F will be described with reference to FIG.

  The clip 24 is provided with an inverted U-shaped gripping portion 94 at the upper end portion of the U-shaped clip base 92, and is gripped rotatably at the upper end portion of the inverted U-shaped gripping portion 94. A rod 96 is provided. As the grip rod 96 rotates, the film F is gripped by the grip rod 96 and the lower portion of the grip portion 94.

  The clip base 92 is provided with a tenter chain 22 inside a U-shaped recess 98. Further, below the recess 98, the first traveling wheel 100 is rotatably provided. The rotation axis of the first traveling wheel 100 is in the vertical direction.

  An extending portion 102 projects inward from the clip base 92, and a second traveling wheel 104 is rotatably provided at the lower portion of the extending portion 102. The rotation axis of the second traveling wheel 104 is in the vertical direction. Further, a third traveling wheel 106 is provided outside the extended portion 102. The rotation axis of the third traveling wheel 106 is in the horizontal direction.

  The first traveling wheel 100 of the clip base 92 travels along the vertical rail 27 of the partial rail 28 and the front spring plate 74 of the guide plate 72, and the second traveling wheel 104 includes the vertical rail 27 of the partial rail 28 and the guide plate. The third traveling wheel 106 travels along the upper surface of the lateral rail 29 of the partial rail 28 and the upper surface of the connecting shaft 52.

(6) Electrical Configuration of Tenter Device 10 Next, an electrical configuration of the tenter device 10 will be described based on the block diagram of FIG.

  The control unit 108, which is a control unit of the tenter device 10, includes a driven slide motor 25, a drive motor 26 that rotates the drive sprocket 20, a drive slide motor 37, a positioning motor 46 that moves the drive base 38 in the front-rear direction, and a coupling base 56. Are connected to each other, and an operation unit 110 for an operator to operate the tenter device 10 is also connected.

(7) Operation State of Tenter Device 10 Next, the operation state of the tenter device 10 will be described with reference to FIG.

  As shown in FIGS. 1 and 2, even when the film F is horizontally stretched or obliquely stretched, when the film F is loaded from the carry-in entrance at a constant speed, the pair of left and right clips 24, 24 are Grasping both ears and running at a running speed V. The tenter device 10 travels inside a heat treatment device (not shown), and the film F is laterally stretched or obliquely stretched by the tenter device 10 while being heated. As shown in FIGS. 7 and 8, the clip 24 holding the film F moves along the partial rail 28 of the tenter rail 16. In this case, the first traveling wheel 100 of the clip 24 travels along the surface of the vertical rail 27 of the partial rail 28 and the surface of the guide plate 72, and the second traveling wheel 104 extends from the vertical rail 27 of the partial rail 28. The third traveling wheel 106 moves along the rear surface of the partial rail 28 and the upper surface of the connecting shaft 52.

  A case where the first traveling wheel 100 moves on the surface of the guide plate 72 will be described with reference to FIG.

  The front spring plate 74 in the guide plate 72 is in a state in which the protruding piece 80 of the first front spring plate 74a and the recess 88 of the second front spring plate 74b are fitted. Therefore, as shown in FIG. 12, a gap 74c is formed between the first front spring plate 74a and the second front spring plate 74b. However, as shown in FIG. 12, the lower side of the projecting piece 80 and the lower side of the recess 82 are always continuous regardless of the gap 74c. Therefore, as shown in FIG. 12, the first traveling wheel 100 passes through the boundary between the projecting piece 80 and the recess 82 at the position of the gap 74c. In this case, the first traveling wheel 100 does not pass the positions of the pressing plate 84 and the bolt 83. Thus, the first traveling wheel 100 can pass smoothly without any step by passing through the surface of the vertical rail 27 of the partial rail 28, the first front spring plate 74 a, the boundary described above, and the second front spring plate 74 b.

  A case where the second traveling wheel 104 moves on the back surface of the guide plate 72 will be described with reference to FIG.

  The second traveling wheel 104 moves on the back surface of the vertical rail 27 of the partial rail 28, the first back spring plate 76a, and the second back spring plate 76b. In this case, a gap 76c is generated between the first back spring plate 76a and the second back spring plate 76b, and a step is generated. However, even in this case, the second traveling wheel 104 smoothly passes through the boundary between the upper side of the protruding piece 86 of the first back spring plate 76a and the upper side of the recess 88 of the second back spring plate 76b, so that there is no step. I can pass. Further, the second traveling wheel 104 does not pass through the positions of the pressing plate 90 and the bolt 87.

  The film F is laterally stretched or obliquely stretched by increasing the width of the pair of left and right tenter rails 16, and reaches the carry-out port.

(8) Change from Lateral Stretching to Diagonal Stretching Next, in the tenter device 10, a change operation from the device that performs lateral stretching shown in FIG. 1 to the device that performs oblique stretching shown in FIG. 2 will be described.

  An installation operation of the tenter device 10 as a device for performing transverse stretching will be described.

  First, an operator fixes the entrance table 34 of the driven table 30 and the exit table 42 of the drive table 38 at predetermined positions on the floor.

  Next, the operator operates the operation unit 110, and the control unit 108 stops the positioning motor 46 so that the drive base 38 does not move in the front-rear direction.

  Next, the operator operates the operation unit 110 so that the control unit 108 adjusts the distance and position between the pair of left and right drive sprockets 20 and 20 of the drive base 38 to the left and right rails 40 according to the width of the film F to be processed. The drive slide plates 36 and 36 are moved and fixed along, respectively.

  Next, the operator operates the operation unit 110 so that the control unit 108 adjusts the distance and position of the pair of left and right driven sprockets 18 and 18 of the driven table 30 to the left and right rails 33 according to the width of the film F to be processed. The driven slide plates 31 and 31 are moved and fixed along the same.

  Next, the operator operates the operation unit 110, and the control unit 108 moves the connection portion by the connection motor 70 based on the distance between the partial rails 28 of the tenter rail 16 in accordance with the lateral stretching of the film F. Let For example, in the case of FIG. 1, the first to fifth partial rails 28, 28 counted from the carry-in entrance are arranged in parallel, and the sixth partial rails 28, 28 expand the film F symmetrically. The seventh to ninth partial rails 28 and 28 are arranged in parallel. In this case, since the sixth partial rail 28 is inclined by the connecting portion, the distance L from the carry-in port to the carry-out port becomes shorter than the case where all the partial rails 28 are arranged on a straight line. It becomes. Therefore, the driven table 30 moves rearward along the front and rear rails 32 with respect to the entrance table 34 by this shortened distance. Since the driven table 30 is provided so as to be freely movable with respect to the entrance table 34, the movement is performed only by determining the position and angle of each partial rail 28. Since the driven table 30 freely moves in the front-rear direction with respect to the entrance table 34, even if the partial rail 28 or the tenter chain 22 expands or contracts due to heat, the expansion and contraction is absorbed by the movement of the driven table 30.

  Next, the case where the tenter device 10 is changed from a device that performs transverse stretching to a device that performs oblique stretching will be described.

  As shown in FIG. 2, in the apparatus that performs oblique stretching, the fourth partial rails 28 and 28 are arranged in parallel (parallel to the y-axis), and the fifth and sixth partial rails 28 and 28 are provided. The seventh to ninth partial rails 28 and 28 are arranged again in parallel again (parallel to the y axis) with an inclination of θ ° with respect to the y axis.

  In this case, since the two partial rails 28 are inclined, the distance L from the carry-in port to the carry-out port becomes shorter than that in the case of the apparatus performing lateral stretching, and L2 (however, L1> L2). Become. Since this shortened distance cannot be absorbed only by the follower base 30 moving backward through the entrance base 34, the control unit 108 moves the drive base 38 on the exit side toward the entrance with respect to the exit base 42. Move at 46. Thereby, the distance L between the carry-in port and the carry-out port can be shortened to L2. Each connecting shaft 52 at this time will be described in detail.

  First, as shown in FIGS. 2 and 7, the third partial rail 28 and the fourth partial rail 28 are in a straight line state, and the pair of left and right guide plates 72 and 72 are also in a parallel state. As shown in FIG. 5, the third connecting shaft 52 counted from the carry-in port is also located at the center of the long hole 58.

  Next, when the control unit 108 moves the fifth and sixth connecting shafts 52 to the left by the connecting motor 70, the fifth connecting shaft 52 moves the fifth connecting shaft 52 with respect to the fourth partial rail 28. The partial rail 28 bends to the left. In this case, the connecting shaft 52 moves to one end of the long hole 58. The pair of left and right guide plates 72 are also curved. The movement of the guide plate 72 will be described in more detail.

  About the right guide plate 72, it will be in the state extended rather than the linear state. Therefore, the protruding piece 80 of the first front spring plate 74a and the concave portion 82 of the second front spring plate 74b in the linear state shown in FIG. 12A slide as far as possible as shown in FIG. 12B. The gap 74c is expanded. Similarly, the back spring plate 76 is changed from the state shown in FIG. 13C to the state shown in FIG.

  With respect to the left inner guide plate 72, the projecting piece 80 of the first front spring plate 74a and the concave portion 82 of the second front spring plate 74b in a straight state as shown in FIG. As shown in the drawing, the projecting piece 80 slides relative to the recess 82 so as to be contracted, and the gap 74c disappears. Similarly, the back spring plate 76 has no gap 76c as shown in FIG.

  As described above, the tenter device 10 can be changed from a device that performs transverse stretching to a device that performs oblique stretching. The tenter device 10 can be changed from a device that performs oblique stretching to a device that performs lateral stretching by performing a change operation opposite to the above.

(9) Method of moving the drive base 38 In the above description, since the distance L from the carry-in port to the carry-out port is L1, in the apparatus that performs lateral stretching, only the driven table 30 is moved rearward to perform oblique stretching. In the apparatus to be performed, since the distance L from the carry-in port to the carry-out port is L2 (however, L1> L2), the driven table 30 is moved backward, and the drive table 38 is also moved forward.

  A first method of moving and fixing the drive base 38 forward will be described based on the flowchart of FIG.

  In step S <b> 1, the control unit 108 drives the coupling motor 70 to tilt the partial rail 28 by α °, and moves the driven base 30 backward. However, for this α °, an angle at which no mechanical breakage occurs is set in advance by an experiment or the like. In addition, since the partial rail 28 and the tenter chain 22 expand and contract due to heat, α ° is set so that the driven base 30 can always absorb the expansion and contraction. Furthermore, since the connecting motor 70 is a servo motor, the inclination angle of the partial rail 28 is proportional to the rotation angle. Therefore, the inclination angle is determined by the rotation angle of the connecting motor 70. Then, the process proceeds to step S2.

  In step S <b> 2, the control unit 108 moves the drive base 38 forward by the distance M <b> 1 by the positioning motor 46 while the driven base 30 is moved backward. Then, the process proceeds to step S3.

  In step S <b> 3, the control unit 108 further tilts the partial rail 28 by β ° by the connecting motor 70. That is, the control unit 108 tilts the total (α + β) °. However, for this β °, an angle at which no mechanical breakage occurs is set in advance by an experiment or the like. Then, the process proceeds to step S4.

  In step S4, the control unit 108 determines whether or not the tilt angle (α + β) ° has reached the target tilt angle γ °, and if so, proceeds to step S8. Proceed to step S5.

  In step S5, the control unit 108 moves the drive base 38 further forward by the positioning motor 46 by the distance M1 in a state where the driven base 30 is moved backward. Then, the process proceeds to step S6.

  In step S6, the control unit 108 further tilts the partial rail 28 by β °. Then, the process proceeds to step S4.

  In step S7, the control unit 108 determines whether or not the tilt angle has reached the target tilt angle γ °. If so, the process proceeds to step S8, and if not, returns to step S5.

  In step S <b> 8, the control unit 108 stops the positioning motor 46 in a state where the driven table 30 is moved backward, and fixes the position of the drive table 38. And it ends.

  The second method is as follows, for example. The control unit 108 sets a reference distance L0 in advance, and when the distance L from the carry-in port to the carry-out port is longer than the reference distance L0, only the driven table 30 is moved backward, and when the distance L is shorter than the reference distance L0, the driven table is set. 30 is moved backward, and the drive base 38 is moved forward. The moving distance of the drive base 38 is increased as the difference between L0 and L2 increases. However, since the partial rail 28 and the tenter chain 22 expand and contract due to heat, the reference distance L0 is set to be long so that the driven base 30 can always absorb the expansion and contraction.

  As a third method, the control unit 108 always measures the torque of the connecting motor 70 when the partial rail 28 is tilted. And even if it is going to incline the partial rail 28, the control part 1087 does not shorten the distance L, and if it does not incline any more and the measured torque exceeds a reference torque, it will move the drive base 38 ahead, and distance L will be carried out. It is shortened so that the partial rail 28 can be tilted so that the measured torque does not exceed the reference torque. The control unit 108 repeats this operation to incline the partial rail 28 at a predetermined angle.

(10) Effect According to the present embodiment, when the inclination angle of the partial rail 28 is small and the distance from the carry-in port to the carry-out port is small as in the case of an apparatus that performs lateral stretching, only the driven table 30 is provided. The tenter device 10 can be configured by moving.

  Further, in the case where the inclination angle of the partial rail 28 is large and the distance shortening from the carry-in port to the carry-out port is large as in the case of an apparatus that performs oblique stretching, the drive table 38 is also added to the movement of the driven table 30 in addition to the movement of the driven table 30 In order to move to the carry-in side, the partial rail 28 can be inclined according to a desired oblique extension angle.

  Further, since the gap portion between the adjacent partial rails 28 and 28 is rotatably connected by the connecting shaft 52, the partial rail 28 can be easily inclined.

  Further, since the gap between adjacent partial rails 28 and 28 is connected by a guide plate 72 including three layers of a front spring plate 74, a back spring plate 76, and a back spring plate 78, the partial rail 28 is inclined. However, due to the elastic force of the spring, the gap portion between the adjacent partial rails 28 and 28 is connected in a curved state, and the clip 24 can move smoothly.

Embodiment 2

  A tenter device 10 according to Embodiment 2 will be described with reference to FIG.

  The tenter device 10 according to the first embodiment has a structure in which a pair of left and right drive sprockets 20 and 20 are simultaneously moved along the y-axis toward the carry-in entrance side in parallel.

  In the tenter device 10 according to the first embodiment, when the pair of left and right partial rails 28 and 28 are inclined in order to perform oblique stretching, the movement amount of the partial rail 28 on the outer side is larger than the partial rail 28 on the inner side. Become. Therefore, even if there is a margin in the amount of movement of the long hole 58 in the connecting portion that connects the inner partial rails 28, 28, there is a margin in the amount of movement in the long hole 58 in the connecting portion that connects the outer partial rails 28, 28. In some cases, the protrusion 60 hits the end of the long hole 58, and the inclination cannot be further mechanically performed.

  Therefore, in the present embodiment, the tenter device 10 is provided in which the outer partial rail 28 can be further inclined when performing oblique stretching.

(1) Structure of Tenter Device 10 Differences between the structures of the present embodiment and the first embodiment will be described. In the present embodiment, the pair of left and right drive sprockets 20 and 20 are not moved in parallel, but the left drive sprocket 20L on the left side and the right drive sprocket 20R on the right side can be moved independently. Specifically, an exit base 42 fixed to the floor is provided at the exit of the tenter device 10 of the present embodiment, and a left drive base 38L is provided on the outlet base 42 so as to be movable in the front-rear direction. A left drive slide plate 36L is provided on the left drive base 38L so as to be movable in the left-right direction, and a left drive sprocket 20L is provided on the left drive slide plate 36L so as to be rotatable. Similarly, a right drive base 38R is provided on the outlet base 42 so as to be movable in the front-rear direction, and a right drive slide plate 36R is provided on the right drive base 38R so as to be movable in the left-right direction. A right drive sprocket 20R is rotatably provided on the slide plate 36R.

  The left drive sprocket 20L is rotated at a predetermined speed by the left drive motor 26L. Further, the right drive sprocket 20R is rotated at a predetermined speed by the right drive motor 26R.

  The left drive slide plate 36L is arranged on the left drive base 38L so as to be movable in the left-right direction via left-right rails 40L, 40L. The right drive slide plate 36R is disposed on the right drive base 38R so as to be movable in the left-right direction via the left-right rails 40R, 40R.

  The left drive base 38L is disposed on the exit base 42 so as to be movable in the front-rear direction via the left linear way. The left linear way is configured to rotate the left male screw rod connected to the left positioning motor, thereby The left drive base 38L is moved in the front-rear direction with respect to the base 42. This structure is the same as that of the first embodiment. The right drive base 38R is arranged on the outlet base 42 so as to be movable in the front-rear direction via the right linear way. The right linear way is rotated by rotating a right male screw rod connected to the right positioning motor. The right drive base 38R is moved in the front-rear direction with respect to the exit base 42. This structure is the same as that of the first embodiment.

(2) Inclination of partial rails 28 and 28 In the tenter apparatus 10 of this embodiment, the structure which inclines the left-right paired partial rails 28 and 28 is demonstrated. In addition, the structure of the connection part of the two partial rails 28 and 28 is the same as that of the first embodiment.

  As shown in FIG. 15, a pair of left and right drive sprockets 20L, R are simultaneously moved to the carry-in side as in the first embodiment, and the pair of left and right left partial rails 28 and right part 28 are inclined. When the protrusion 60 cannot move any more in the long hole 58 of the left partial rail 28 on the outside that is inclined, only the drive sprocket 20L corresponding to the left partial rail 28 on the outside is moved along the y-axis direction. Then, the left drive base 38L is used to move to the carry-in side. As a result, there is a margin in the elongated hole 58 of the inclined left partial rail 28 that has been located outside, and the left partial rail 28 can be further inclined.

  Moreover, the tenter apparatus 10 of Embodiment 1 and Embodiment 2 has extended | stretched the film F diagonally by the inclination of 2 steps | paragraphs. That is, in both embodiments, the first oblique extension is performed at the position of the fourth connecting shaft 52 and the right connecting shaft 52 (hereinafter referred to as “first stage position”) counting from the carry-in side, and from the carry-in side. The second oblique stretching is performed at the position of the sixth connecting shaft 52 and the right connecting shaft 52 (hereinafter referred to as “second stage position”).

  In the tilting method of the first embodiment, as shown in FIG. 2, the position of the left connecting shaft 52 and the right connecting shaft 52 are parallel at the first stage position, and the left connecting shaft 52 at the second stage position. 52 is located on the carry-in side of the right connecting shaft, so that when the film F is stretched obliquely, the inclination angle of the second stage position becomes larger than the inclination angle of the first stage position, which adversely affects the oblique stretching of the film F. May affect.

  On the other hand, in the tilt method of the present embodiment, as shown in FIG. 15, the position of the left connecting shaft 52L can be moved to the carry-in port side relative to the right connecting shaft 52R. The angle becomes larger than the inclination angle at the position of the second stage, and the film F is not adversely affected.

(3) Effect With the tenter device 10 of the present embodiment, the pair of left and right drive sprockets 20L and 20R can be moved independently along the y-axis direction to the carry-in entrance side. When the partial rails 28 and 28 are inclined, the inclination of the partial rails 28 located outside can be increased.

  Further, by shifting the position of the partial rail 28, the inclination angle of the film F at the first stage position can be made larger than the inclination angle at the second stage position, and the oblique stretching is not adversely affected.

(4) Modified example In the above embodiment, the outer drive sprocket 20 having a large inclination angle is moved to the carry-in side, but instead, the drive sprocket 20 corresponding to the partial rail inside is moved to the carry-out side. You may let them.

  Alternatively, the drive sprocket 20 positioned on the outside may be moved simultaneously to the carry-in side, and the drive sprocket 20 located on the outside may be moved simultaneously to the carry-out side.

Example of change

  In the above-described embodiment, the apparatus for performing transverse stretching is changed to the apparatus for performing oblique stretching. However, the present invention is not limited to this, and the apparatus for performing lateral stretching is also a lateral stretching apparatus for widening the carry-out port wider than the carry-in port. Also in this change, the configuration of the present embodiment in which the drive base 38 is also moved to the carry-in side in addition to the movement of the driven base 30 can be applied. Similarly, in an apparatus that performs oblique stretching, the configuration of the present embodiment in which the drive base 38 is also moved to the carry-in port side in addition to the movement of the driven base 30 can be applied when the inclination angle of the partial rail 28 is changed.

  Moreover, although the clip tenter device has been described in the above embodiment, the present embodiment may be applied to a pin tenter device instead.

  Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Tenter device, 16 ... Tenter rail, 18 ... Drive sprocket, 20 ... Drive sprocket, 22 ... Tenter chain, 24 ... Clip, 26 ... Drive motor, 28 ..Partial rails, 30 ... driven table, 38 ... driving table

Claims (12)

A pair of left and right tenter rails;
A pair of left and right endless tenter chains arranged along the pair of left and right tenter rails;
Chain driving means for moving the pair of left and right tenter chains in the front-rear direction;
Supporting the base material from both the left and right sides, provided to the pair of left and right tenter chains at predetermined intervals, and traveling along the pair of left and right tenter rails by moving the pair of left and right tenter chains, A plurality of left and right support means for moving the base material from front to back; and
Have
The pair of left and right tenter rails are:
A plurality of pairs of left and right partial rails;
A connecting and moving means for moving the connecting portions of the adjacent partial rails in the front-rear direction and the left-right direction;
Have
The chain driving means is
A pair of left and right drive sprockets on which the pair of left and right tenter chains are spanned,
A pair of left and right driven sprockets on which the pair of left and right tenter chains are respectively stretched;
Drive moving means for moving the pair of left and right drive sprockets in the front-rear direction;
Driven moving means for moving the pair of left and right driven sprockets in the front-rear direction;
A drive motor for rotating the drive sprocket;
A tenter device having. The pair of left and right drive sprockets and the drive movement means are provided at a carry-out port of the base material,
The pair of left and right driven sprockets and the driven moving means are provided at a carry-in port of the base material,
The tenter device according to claim 1. The drive moving means is
A drive base in which the pair of left and right drive sprockets are rotatably provided;
Positioning means for moving the drive base in the front-rear direction;
The tenter device according to claim 1, comprising: The drive moving means is
A left drive stand on which the left drive sprocket is rotatably provided;
Left positioning means for moving the left drive base in the front-rear direction;
A right drive base on which the right drive sprocket is rotatably provided;
Right positioning means for moving the right drive base in the front-rear direction;
The tenter device according to claim 1, comprising: The follower moving means is
A driven table in which the pair of left and right driven sprockets are rotatably provided;
A rail on which the follower can move freely in the front-rear direction;
The tenter device according to any one of claims 1 to 4, comprising: The connecting and moving means is
A connecting stand;
A connecting shaft that rotatably connects the ends of the adjacent partial rails;
An elongated hole provided in the front-rear direction on the connection base and engaged with the connection shaft;
Connecting table moving means for moving the connecting table in the left-right direction;
The tenter device according to any one of claims 1 to 5, comprising: A gap between adjacent partial rails is connected by a spring plate,
The support means travels on the surface of the spring plate;
The tenter device according to any one of claims 1 to 6. The gap between the pair of left and right tenter rails at the carry-out port of the base material is wider than the gap between the pair of left and right tenter rails at the carry-in port of the base material,
The tenter device according to any one of claims 1 to 7. The support means is a clip or a pin;
The tenter device according to any one of claims 1 to 8. The base material is a polynorbornene resin film,
The tenter device according to any one of claims 1 to 9. It further has control means for the tenter device,
The control means includes
In a state where the drive sprocket is fixed by the drive movement means, the partial rail is inclined, and the driven sprocket is moved by the driven movement means,
Next, the drive sprocket is moved by the drive movement means,
Next, the partial rail is inclined, and the partial rail is inclined at a predetermined inclination angle.
The tenter device according to any one of claims 1 to 10. It further has control means for the tenter device,
When the control means tilts the pair of left and right partial rails, one of the pair of left and right partial rails positions one drive base corresponding to one of the partial rails positioned on the outer side. Move to the carry-in side using means,
The tenter device according to claim 4.

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