JP2018177382A - Sheet folding device and foldable body manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet folding device capable of efficient mass production of a foldable body and to provide a foldable body manufacturing method.SOLUTION: A foldable body manufacturing method 10 comprises: a discharging process 12 to discharge a flat sheet S1; a corrugated folding process 14 to fold the flat sheet S1 with corrugated creases BL1; and a parallel folding process 16 to fold the corrugated sheet S2 obtained through the corrugated folding process 14 with parallel creases BL2. The corrugated folding process 14 is made up of: a warping step 14A to warp the flat sheet S1 at predetermined locations; and a pressing step 14B to press warped portions of the flat sheet S1. The parallel folding process 16 is made up of: a bending step 16A to bend the corrugated sheet S2 at a set position of the parallel creases BL2; and a folding step 16B to fold the bent corrugated sheet S2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sheet folding apparatus and a method of manufacturing a folding body.

  Nowadays, a very large number of documents are almost one size A4. However, due to the need to describe various information, there is an increasing demand for larger-sized documents such as maps, plans, and manuals. Large-size products often need folding after output for their carrying and storage. Thus, there is an increasing demand for instruments for compacting documents.

  Among various folding structures, a folding structure called Miura fold (registered trademark) has unique properties such as expansion / retention, strength, memory of folds, etc., as compared with a normal bellows fold structure (patented) References 1-2).

JP 2008-284860 A JP, 2009-51620, A

  In order to make a folded structure called Miura fold (registered trademark), it is necessary to fold the original sheet with a wavy fold. However, even if a folding process is performed using a machine, automation is difficult because of problems such as the case where the sheet is detached from the ideal folding structure or tearing of the sheet. For this reason, the said folding structure can not be efficiently mass-produced, but there existed a limit in spreading the Miura fold with the outstanding characteristic to a market.

  In view of such circumstances, the present invention is intended to provide a sheet folding apparatus and a method of manufacturing a folding body capable of efficiently mass-producing the folding body.

  In the present invention, when a first sheet portion, a second sheet portion separated from the first sheet portion, and an intermediate sheet portion between the first sheet portion and the second sheet portion are defined among sheets. A sheet folding apparatus that folds the intermediate sheet portion with a wavy fold, and includes a bending unit that bends the intermediate sheet portion, and a folding unit that folds a curved portion of the intermediate sheet portion.

  The present invention is a sheet folding apparatus that folds a sheet at a plurality of intersection folds crossing the mountain fold and the valley fold with respect to the sheet in which the mountain fold and the valley fold are alternately arranged, based on the sheet A first pressing member pressing against the valley fold line of the cross fold from the first side, and from the second side opposite to the first side against the valley fold line of the cross fold A second pressing member to be pressed, a pressing member moving unit for performing relative movement between the first pressing member and the second pressing member, the first pressing member and the second pressing member And a folding unit for folding the sheet in a folded state, wherein the pressing member moving unit is configured to place the first pressing member in a first state positioned between the plurality of second pressing members. , A second state evacuated from the first state Characterized by freely switching between.

  In the present invention, when a first sheet portion, a second sheet portion separated from the first sheet portion, and an intermediate sheet portion between the first sheet portion and the second sheet portion are defined among sheets. A method of manufacturing a folded body in which the intermediate sheet portion is folded, comprising: a bending step of bending the intermediate sheet portion; and a folding step of bending the curved portion of the intermediate sheet portion.

  The present invention provides a method of manufacturing a folded body in which mountain folds and valley folds are alternately performed on a sheet in which mountain folds and valley folds are alternately arranged at a plurality of crossing folds crossing the mountain folds and the valley folds. And pressing the valley fold line of the crossing fold from the first side with reference to the sheet, and the valley fold of the crossing fold from the second side opposite to the first side It is characterized by comprising: a bending step of pressing the sheet against a line, and a folding step of folding the sheet in a state of being folded by the first pressing member and the second pressing member. .

  According to the present invention, the folded body can be efficiently mass-produced.

(A) is a top view which shows the outline | summary of folding structure, (B) is a top view which shows the outline | summary of a folding body. It is a flowchart which shows the outline | summary of the manufacturing method of a folding body. (A) is a top view which shows the outline | summary of a flat sheet, (B) is IIIa-IIIa 'sectional drawing which shows the outline of a flat sheet. It is a perspective view which shows the outline | summary of a corrugated sheet. It is explanatory drawing which shows the outline | summary of the manufacturing equipment of folding structure. (A) is a side view which shows a bending unit and a press unit, (B) is a top view which shows a bending unit and a press unit. (A) is a side view which shows a bending unit and a press unit, (B) is a top view which shows a bending unit and a press unit. (C) is a top view which shows the outline | summary of the flat sheet in which the press mark was formed of the press process. (A)-(I) are side views which show a bending unit and a press unit. (A)-(D) are side views which show a bending unit. (A)-(B) is a side view which shows a folding unit. (A)-(B) is a side view which shows a folding unit. It is an explanatory view showing an outline of a curving process. (A)-(D) are side views which show another embodiment of a bending unit. (A)-(C) is a sectional view showing another embodiment of a temporary accommodation unit.

  As shown in FIG. 1A, the folding structure 2 called Miura fold (registered trademark) includes a sheet S, a wavy fold BL1 formed on the sheet S, and a parallel fold BL2 formed on the sheet S. Equipped with The wavy folds BL1 extend in the longitudinal direction, and the parallel folds BL2 extend in the lateral direction. The wavy folds BL1 and the parallel folds BL2 cross each other. When the sheet S is alternately mountain-folded and valley-folded at the wavy fold BL1, and then mountain-folded and valley-folded alternately at the parallel fold BL2, the sheet can be folded in a compact manner (see FIG. 1B). The folded body 4 shown in FIG. 1B is obtained by folding the folding structure 2 at the wavy fold line BL1 or the parallel fold line BL2. Such a foldable body 4 has excellent folding and storage properties, strength, memory of folds and the like because it has a special folding structure 2 such as Miura fold (registered trademark).

  As shown in FIG. 2, the method 10 of manufacturing the folded body includes at least a delivery step 12 for delivering the flat sheet S1, a wave folding step 14 for folding the flat sheet S1 at the wavy fold line BL1, and a wave folding step 14. And a parallel folding step 16 of folding the corrugated sheet S2 obtained by the above at the parallel fold line BL2.

  The flat sheet S1 may be any of paper, plastic and metal.

  The wave folding step 14 includes a bending step 14A for bending a predetermined portion of the flat sheet S1, and a pressing step 14B for pressing the curved portion of the flat sheet S1. The corrugated sheet S2 (refer to FIG. 4) can be obtained from the flat sheet S1 (refer to FIG. 3) by the corrugated step 14. The flat sheet S1 shown in FIG. 3 has a flat sheet body S11, a plurality of wavy folds BL1 formed on the sheet body S11, and a plurality of parallel folds BL2. The wavy folds BL1 and the parallel folds BL2 are arranged at a predetermined pitch in the sheet main body S11. The wavy folds BL1 here are zigzag-shaped, but the bending angle and the distance between the bending positions are predetermined. The wavy folds BL1 and the parallel folds BL2 can be formed on the flat sheet S1 by predetermined pressing.

  The corrugated sheet S2 shown in FIG. 4 is formed by alternately folding valley folding and mountain folding at a plurality of wavy folds BL1 in the flat sheet S1.

  Returning to FIG. 2, the parallel folding step 16 includes a bending step 16A for bending the corrugated sheet S2 at the setting position of the parallel fold BL2, and a folding step 16B for folding the corrugated sheet S2 in a bent state. The setting position of the parallel fold line BL2 is set to be a predetermined pitch. In the parallel folding step 16, the folded body 4 (see FIG. 1) can be obtained from the corrugated sheet S2 (see FIG. 4).

  As shown in FIG. 5, the manufacturing facility 20 of the folding structure includes a delivery unit 30 in which the delivery step 12 is performed, a bending unit 40 in which the bending step 14A is performed, a press unit 50 in which the pressing step 14B is performed, and a bending step. 16A is performed, a folding unit 70 in which the folding step 16B is performed, an accommodation unit 80 for accommodating the folding structure 2 obtained by the folding unit 70, and individual control of each component of each unit 30 to 80 And a control unit 90.

  The delivery unit 30 includes a case 31 in which the flat sheet S1 is stored in a stacked state, a suction cup 32 movable in three directions of the feeding direction X, width direction Y and height direction Z, and exhaust port connected to the suction cup 32. A pump (not shown) and a conveyance roller 35 for feeding the flat sheet S1 to the bending unit 40 are provided.

  As shown in FIGS. 5 to 7, the bending unit 40 includes a drive roller 41, a driven roller 42, a motor (not shown) for driving the drive roller 41, and a temporary accommodation unit 44 for temporarily accommodating the corrugated sheet S2. Prepare. The control unit 90 controls the drive roller 41 via control of the motor. The drive rollers 41 are arranged at a predetermined pitch in the feed direction X. The driven roller 42 is disposed to face the driving roller 41. The paired drive roller 41 and driven roller 42 can convey the flat sheet S1 in a predetermined direction while gripping the flat sheet S1. In the manufacturing equipment 20 of the folding structure shown in the figure, three roller pairs consisting of the driving roller 41 and the driven roller 42 are arranged at a predetermined pitch. Thus, the conveyance path R1 of the flat sheet S1 is formed in the bending unit 40 by the two roller pairs. The transport path R1 extends to the temporary storage unit 44.

  Here, when it is desired to feed the flat sheet S1 in the feed direction X, the three drive rollers 41 may be rotated (normally rotated) in the same direction (see FIGS. 8A and 8I). Here, when the rotation direction of the drive roller 41 on the most downstream side among the three drive rollers 41 is reversely rotated (reversed), the flat sheet S1 is formed by the middle drive roller 41 and the drive roller 41 on the most downstream side. In the space CL2 with the lower side (see FIG. 6 and FIG. 8 (B)). On the other hand, when it is desired to feed the flat sheet S1 to the opposite side in the feed direction X (if it is desired to return it), the three drive rollers 41 may be reversed. Here, when the rotation direction of the drive roller 41 on the most upstream side among the three drive rollers 41 is rotated forward, the flat sheet S1 is in the clearance CL1 between the drive roller 41 on the most upstream side and the drive roller 41 in the middle. , Curving upward (see FIG. 8 (F)).

  As shown in FIGS. 5 to 7, the press unit 50 is disposed between the roller pair consisting of the drive roller 41 and the driven roller 42 in the feed direction X. When three roller pairs are provided, the press unit 50 is disposed at a position higher than the conveyance path R1 in the clearance CL1 on the upstream side, and at a position lower than the conveyance path R1 in the clearance CL2 on the downstream side. A press unit 50 is arranged. In this way, a gap K1 is formed so that the flat sheet S1 can be bent from each roller pair to the press unit 50 (see FIG. 6). The press unit 50 may be disposed in the gap CL1 at a position lower than the transport path R1, and the press unit 50 may be disposed in the gap CL2 at a position higher than the transport path R1.

  The press unit 50 has a press pair 51 which can be opened and closed. As shown in FIGS. 6 to 7, the press pair 51 includes a pair of press tools aligned in the feed direction X, and is aligned at a predetermined pitch in the width direction Y of the transport path R1. The pitch is preferably set so that the press surface 51F of the press pair 51 escapes from the bent portion T1 (see FIG. 1) of the wavy fold line BL1. The press surface 51F preferably corresponds to the central portion of the line segment L1 (see FIG. 1) of the wavy fold line BL1. Therefore, the press marks PK1 forming the wavy folds BL1 are arranged at a predetermined pitch in the width direction Y as shown in FIG. 7C.

  Further, the press surface 51F is oblique to the width direction Y. Furthermore, regarding the press pairs 51 adjacent in the width direction Y, the respective press surfaces 51F are directed in the alternate direction. Thereby, the wavy fold BL1 can be formed using the press pair 51. In addition, since the press surface 51F of the press pair 51 escapes from the bent portion T1 (see FIG. 1) of the wavy fold line BL1, it is possible to prevent the flat sheet S1 from being scratched, wrinkled or broken during operation of the press pair 51. Therefore, it is preferable that the number of installed press pairs 51 in the width direction Y be prepared as many as the number of line segments L1 (see FIG. 1) forming the wavy fold BL1.

  The bending unit 40 preferably further includes a restriction plate 47. The regulating plate 47 regulates the direction in which the flat sheet S1 curves, and is disposed in each of the gap CL1 and the gap CL2. The restricting plate 47 is formed in a plate shape and extends in the width direction Y. The restricting plate 47 preferably has a protruding ridge line 47T at a midway portion in the feed direction X. The protruding ridge line 47T protrudes toward the transport path R1 and extends in the width direction Y.

  The restriction plate 47 disposed in the clearance CL1 is disposed to face the press unit 50 via the conveyance path R1. Similarly, the regulating plate 47 disposed in the gap CL2 is disposed to face the press unit 50 via the conveyance path R1. The restricting plate 47 suppresses the flat sheet S1 from bending toward the restricting plate 47 with reference to the conveyance path R1. According to the restriction plate 47, when the flat sheet S1 is to be curved, the bending toward the press unit 50 can be promoted.

  As shown in FIGS. 5 and 9, the bending unit 60 transports the corrugated sheet S2 to the folding unit 70 and performs the bending step 16A, and the main support rod touches one surface of the corrugated sheet S2. 61, a main side drive unit 62 for driving the main support rod 61, a follower support 63 for touching the other surface of the corrugated sheet S2, and a follower side drive unit 64 for driving the follower support 63.

  The main support rod 61 touches the valley fold line of the parallel fold BL2. The secondary support 63 includes a left support rod and a right support rod. The left support rod is disposed so as to escape to the left side in the width direction Y as viewed from the valley fold line. The right side support rod is disposed to escape to the right side in the width direction Y as viewed from the valley fold line. The main support rod 61 is movable between the left support rod and the right support rod of the secondary support 63 by the main drive unit 62 and the secondary drive unit 64. The main support bar 61, the left support bar and the right support bar are all formed in a cylindrical shape. The shapes of the main support bar 61, the left side support bar and the right side support bar may not be cylindrical, but the portion in contact with the corrugated sheet S2 is preferably a convex curved surface. It is preferable that a pair of the main support rod 61 and the secondary support 63 be provided for each valley fold line of the parallel fold BL2.

  The main drive unit 62 allows the main support rod 61 to move in three axial directions (for example, the feed direction X, the width direction Y, and the height direction Z). Similarly, the secondary drive unit 64 makes the secondary support 63 movable in three axial directions (for example, the feed direction X, the width direction Y, and the height direction Z). With the main drive unit 62 and the secondary drive unit 64, the pair of the main support rod 61 and the secondary support 63 sandwiches the corrugated sheet S2 (see FIGS. 9A to 9C) and sandwiches it. A conveying state in which the sheet is conveyed to the mounting stage 71 (see FIG. 5) of the folding unit 70 while maintaining it, and a bending state in which the sheet is bent at the valley folding line of the parallel fold BL2 in the mounting stage 71 (FIG. 9D) It can be switched between the reference) and the retracted state separated from the corrugated sheet S2.

  It is preferable that a portion of the main support rod 61 in contact with the corrugated sheet S2 crosses a portion of the secondary support 63 in contact with the corrugated sheet S2. In particular, the distance CLx between the main support bar 61 and the secondary support 63 as it goes from the side (that is, the lower side) closer to the mounting stage 71 of the folding unit 70 (ie, the upper side). Is preferably large. As a result, when the corrugated sheet S2 is folded using the main support rod 61 and the sub-supporting tool 63, the tension due to the folding can be released upward. As a result, the wrinkles and tears of the corrugated sheet S2 are suppressed. , The folding process 16B can be performed smoothly. In FIG. 5, the portion of the main support rod 61 in contact with the corrugated sheet S2 is oblique to the height direction Z, and the portion of the sub support 63 in contact with the corrugated sheet S2 is in the height direction. It is parallel to Z. The portion of the sub-supporting tool 63 which touches the corrugated sheet S2 may be oblique to the height direction Z.

  As shown in FIGS. 5 and 10, in the folding unit 70, both of the work area for the placement stage 71 having the work area for placing the wave-folded sheet S2 and the wave-folded sheet S2 placed for the work A press block 72 for sandwiching from the outside, and a bending structure 75 for bending the corrugated sheet S2 placed in the operation.

  The press blocks 72 are arranged in pairs on the mounting stage 71. The control unit 90 allows the pair of press blocks 72 to move to predetermined positions in the width direction Y, respectively.

  The bending structure 75 is disposed at the upper portion of the press block 72 and extends in the XY plane, a pivoting arm 75A, a support rod 75B extending downward from the tip of the pivoting arm 75A, and a pressing plate disposed in the X direction. And 75D. The pivoting arm 75A is pivotable about a pivot axis AX1 extending in the height direction Z. The pressing plate 75D is movable in the feed direction X and the width direction Y. By the control unit 90, the support rod 75B pivots about the pivot axis AX1, and the pressing plate 75D is movable to a predetermined position in the feed direction X and the width direction Y.

  The housing unit 80 is for housing the folding body 4 obtained by the folding unit 70, and is an open / close door 81 formed at the opening of the work area of the mounting stage 71 and an internal space of the mounting stage 71. And a storage space 82 communicating with the external space via the open / close door 81. The open / close door 81 may be omitted.

  Next, the manufacturing method 10 of the folding body in the manufacturing facility 20 of the folding structure will be described.

(Delivery process)
As shown in FIG. 5, the delivery unit 30 places the suction cups 32 on the uppermost flat sheet S1 of the stacked flat sheets S1. In this state, when the exhaust pump is driven, the suction cup 32 sucks the flat sheet S1 at the uppermost position and conveys it to the conveying roller 35. Thereafter, by setting the air pressure of the suction cup 32 to atmospheric pressure, the suction by the suction cup 32 is released, and the flat sheet S1 is placed on the conveyance roller 35. The transport roller 35 feeds the flat sheet S1 to the bending unit 40.

(Bending process and pressing process)
In the bending unit 40, when the three drive rollers 41 are rotated in the same direction (forward rotation), the flat sheet S1 is fed in the feed direction X (see FIG. 8A). When the valley folding position of the wavy fold BL1 is positioned in the gap CL2, the two upstream drive rollers 41 are rotated forward and the downstreammost drive roller 41 is reversed (see FIG. 8B). As a result, the portion of the flat sheet S1 located in the gap CL2 is curved downward by the restriction plate 47 than the conveyance path R1. When the curved portion of the flat sheet S1 reaches the press area of the press unit 50, the press pair 51 is closed (see FIG. 8C). Thereby, the flat sheet S1 is folded at the valley fold line of the wavy fold line BL1. Thereafter, when the press pair 51 is opened and the rotation direction method of the three drive rollers 41 is changed, the flat sheet S1 is stretched back and forth in the feed direction X, and the curved state is released (FIGS. See E).

  Next, the three drive rollers 41 are rotated in a predetermined direction so that the mountain fold position of the wavy fold BL1 reaches the gap CL1. One drive roller 41 on the most upstream side is rotated forward, and two drive rollers 41 on the downstream side are rotated reversely (see FIG. 8F). As a result, the portion of the flat sheet S1 located in the gap CL1 is curved upward by the restricting plate 47 than the conveyance path R1. When the curved portion of the flat sheet S1 reaches the press area of the press unit 50, the press pair 51 is closed (see FIG. 8 (G)). In the pressing step, it is preferable that the wavy fold line BL1 be located at the curved portion. Thereby, the flat sheet S1 is folded at the mountain fold line of the wavy fold line BL1. Thereafter, when the press pair 51 is opened to change the rotational directions of the three drive rollers 41, the flat sheet S1 is stretched back and forth in the feeding direction X, and the curved state is released (FIGS. 8H to 8I). reference).

  Thus, the corrugated sheet S2 can be obtained by alternately performing the valley-folding operation and the mountain-folding operation in the bending unit 40. Although the mountain folding operation is performed after the valley folding operation here, the present invention is not limited to this, and the valley folding operation may be performed after the mountain folding operation.

  Here, when the flat sheet S1 is folded using the press unit 50, both ends of the curved portion are gripped by the drive roller 41 and the driven roller 42, and the middle portion thereof is not restricted by other members. , Curved in a free state. That is, such a curved state is deformable in the feed direction X. Since pressing is performed on the curved portion in such a state, the flat sheet S1 is unlikely to be wrinkled, wrinkled or broken. Similarly, since the press units 50 are arranged at a predetermined pitch in the width direction Y, the curved portion is deformable in the width direction Y. Since pressing is performed on the curved portion in such a state, the flat sheet S1 is unlikely to be wrinkled, wrinkled or broken.

(Bending process)
In the bending unit 60, the pair of the main support rod 61 and the sub support 63 sandwiches the corrugated sheet S2 by the main side drive unit 62 and the secondary side drive unit 64 (see FIG. 9). Here, since the press surface 51F of the press pair 51 escapes from the intersection point T1 (see FIG. 1) of the wavy folds BL1, an unpressed portion remains in the set portion of the wavy folds BL1. At this time, it is preferable that the main support rod 61 touch this unpressed portion. Thus, the bending step 16A can be smoothly performed while suppressing the wrinkles, wrinkles and tears of the corrugated sheet S2.

  It is preferable that the corrugated sheet S2 sandwiched by the pair of the main support rod 61 and the secondary support 63 be in a zigzag state that is bent at the setting position of the parallel fold line BL2. Thereby, it is possible to smoothly perform the folding step 16B by the sandwiching structure 72 while suppressing the wrinkles, wrinkles and tears of the corrugated sheet S2.

(Folding process)
Next, the pair of the main support rod 61 and the sub support 63 is conveyed to the mounting stage 71 by the main drive unit 62 and the sub drive unit 64. The pressing plate 75D is pressed from both sides in the feed direction X toward the valley fold line of the parallel fold line BL2. Thus, the corrugated sheet S2 is bent in a zigzag shape. Thereafter, bending of the valley folding line proceeds in the corrugated sheet S2 by the rotation of the rotational arm 75A and the pressing on the corrugated sheet S2 by the pressing plate 75D (see FIG. 10B). When bending at the valley folding line of the corrugated sheet S2 is sufficiently performed (see FIG. 11A), the sandwiching by the press block 72A is performed. Then, after the sandwiching of the corrugated sheet S2 by the press block 72A is started, the pressing plate 75D is separated from the corrugated sheet S2 and the pushing is released (see FIG. 11B). Thereafter, the mountain-folded and valley-folded in the parallel fold BL2 are alternately performed on the corrugated sheet S2 by the press by the press block 72A (see FIG. 11C). Thus, the folded body 4 (see FIG. 1) can be obtained.

  Thus, according to the present invention, the folded body 4 can be efficiently mass-produced. Furthermore, in the manufacturing process, creases, wrinkles, tears, and the like of the flat sheet S1 and the corrugated sheet S2 are less likely to occur.

  As shown in FIG. 5, in the pressing plate 75D, the pressing side 75H pressed against the corrugated sheet S2 is preferably oblique to the height direction Z. As shown in FIG. That is, it is preferable that the angle θ2 of the pressing side 75H with respect to the XY plane is an acute angle. As a result, the corrugated sheet S2 can be pressed gradually from the lower side to the upper side, that is, the corrugated sheet S2 can be bent gradually from the lower side to the upper side. Further, it is preferable that a guide protrusion 75G be provided above the pressing portion 75H. Due to the guide projection 75G, the corrugated sheet S2 is less likely to be lifted upward by the pressing operation by the pressing plate 75D.

  In the above embodiment, the foldable body 4 is manufactured using the flat sheet S1 having the wavy folds BL1 and the parallel folds BL2. However, the present invention is not limited thereto, and may be made from the flat sheet S1 having no wavy folds BL1. In this case, positioning in the feeding direction X or pressing may be performed with respect to the setting position of the wavy fold BL1 instead of the wavy fold BL1.

  In the above embodiment, the restriction plate 47 connected in the width direction Y is used, but the present invention is not limited to this. You may use the regulation board 47 located in a line with predetermined | prescribed pitch in the width direction Y. FIG.

  In the above embodiment, the flat sheet S1 is bent using the bending unit 40 including the driving roller 41 and the driven roller 42, but the present invention is not limited to this, and a predetermined position of the flat sheet S1 may be The flat sheet S1 may be curved using a clamp member that clamps and an LM guide that can move the clamp member in the feed direction X.

  In the above embodiment, the pressing step 14B is performed using the press unit 50 having the press pair 51 which can be opened and closed. However, the present invention is not limited to this. A vibration process may be performed instead of the pressing process 14B. In the vibration process, as shown in FIG. 12, between the weakly curved state in the curved portion W1 (see FIG. 12A) and the strongly curved state in the curved portion W1 (see FIG. 12B) , Flat sheet S1 is switched alternately. By performing this switching a predetermined number of times, the stiffness of the curved portion W1 can be removed, and it becomes easy to bend. The curved portion W1 is preferably a wavy fold line BL1.

  Although the bending unit 60 including the main support rod 61, the secondary support 63, and the secondary drive unit 64 is used in the above embodiment, the present invention is not limited to this, and the secondary support 63 and the secondary side. The drive unit 64 may be omitted. In this case, for any main support bar 61, the main support bar 61 located next to the main support bar 61 also functions as the sub support 63 (FIG. 13).

  By the way, a corrugated sheet S2 in which mountain folds and valley folds are alternately performed at the wavy folds BL1 is temporarily stored in the temporary storage unit 44. However, in the temporary accommodation unit 44, the corrugated fold BL1 on the upstream side of the corrugated sheet S2 can not be maintained in the folded state and may be opened (see FIG. 14A). In the corrugated sheet S2 in this state, conveyance by the bending unit 60 becomes difficult. Therefore, in order to create a broken state (see FIG. 14C) of the wavy fold line BL1 on the upstream side, the temporary accommodation unit 44 has a downstream end projecting portion 44T that protrudes from the downstream end of the mounting surface 44S, It is preferable to have a recess 44K formed on the mounting surface 44S on the upstream side of the end protrusion 44T, an arm 44A disposed in the recess 44K, and a pivot shaft 44X of the arm 44A. The rotation angle θA of the arm 44A may be less than 90 °, or may be 90 ° or more (eg, 120 °). The control unit 90 is in the accommodation state (FIGS. 14A and 14C) accommodated in the recess 44K and the projection state (FIG. 14B) projecting from the recess 44K by the drive of the pivot shaft 44X. The arm 44A can be switched between them. When the arm 44A switches from the accommodated state to the protruded state, the corrugated sheet S2 tends to move to the downstream side while the upstream-side wavy fold BL1 is in the valley-folded state. The downstream side of the corrugated sheet S2 is restricted in movement by the downstream end projecting portion 44T, so that the corrugated sheet S2 is sandwiched by the downstream end projecting portion 44T and the arm 44A in the accommodated state. Thus, the valley-folded state of the wavy fold BL1 on the upstream side can be created. The projecting state of the arm 44A may be maintained until conveyance by the bending unit 60 is performed. Of course, if it is possible to maintain the broken state of the wavy fold line BL1 on the upstream side by temporarily setting the arm 44 in the projecting state (FIG. 14B) (FIG. 14C), the conveyance by the bending unit 60 is Before being performed, the arm 44A may be returned from the protruded state to the accommodated state.

  The present invention is a preliminary folding device that performs preliminary folding of the sheet at a cross fold crossing the mountain fold or the valley fold with respect to the sheet in which the mountain fold and the valley fold are alternately arranged, A first support member supporting the set position of the crossing fold from the first side with reference to the second side, and a second support member supporting the sheet from the second side opposite to the first side And a supporting member moving unit for performing relative movement between the first supporting member and the second supporting member, and the second supporting member is further to the left than the first supporting member of the sheet. A left side supporting member for supporting the right side supporting member and a right side supporting member supporting the right side of the first supporting member of the sheet, the supporting member moving unit is supported by the left side supporting member and the right side supporting member The With respect to the sheet, characterized in that pressing the said first support member. In addition, it is preferable that pressing with respect to the sheet by the first support member is performed first at a crossing portion with the mountain fold or the valley fold in the setting position of the cross fold. Furthermore, it is preferable that the first support member is inclined with respect to the mounting surface on which the sheet is mounted.

  The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

2 Folding structure 4 Folding body 10 Manufacturing method of folding body 12 Delivery process 14 Wave folding process 14A Curving process 14B Press process 16 Parallel folding process 16A Bending process 16B Folding process 20 Manufacturing facility of folding structure 30 Delivery unit 31 Case 32 Suction cup 35 Roller 40 Curved unit 41 Drive roller 42 Driven roller 44 Temporary accommodation unit 47 Guide plate 47T Projected ridge 50 Press unit 51 Press pair 51 F Press surface 60 Bend unit 61 Main support bar 62 Main drive unit 63 Follower support 64 Follower drive unit 70 folding unit 71 mounting stage 72 pinching structure 80 accommodation unit 81 opening / closing door 82 accommodation space 90 control unit

According to the present invention, of the sheets, a first sheet portion, a second sheet portion separated from the first sheet portion in the sheet conveying direction, and an intermediate sheet between the first sheet portion and the second sheet portion and parts, wavy folds, and those containing both the fold lines provided on the seat and before the folding position where the fold is provided in the seat, when defining each said intermediate sheet portion in the corrugated folds In the sheet folding apparatus, the wave-like folds are a plurality of line segments connected in a zigzag shape and extend so as to cross the conveying direction and are arranged at predetermined intervals in the conveying direction. wherein the one side curved unit to the corrugated folds of the intermediate sheet portion is bent to one side, and the folding unit folding in the undulating folds curved, Bei example, said one side curved unit, the first An upstream roller pair capable of gripping and feeding a sheet portion, a downstream roller pair capable of gripping and feeding the second sheet portion, and the upstream roller pair on the other side with respect to the transport path And a control plate disposed between the downstream roller pair, and a control device for controlling each unit, the control device including an upstream drive roller forming the upstream roller pair and the downstream roller pair , And the regulation plate includes a ridge line protruding toward the transport path, and the control device includes the intermediate sheet including the wavy folds. Sending the first sheet portion to the downstream side in the transport direction by the upstream roller pair, and sending the second sheet portion to the upstream side in the transport direction by the downstream roller pair so that the portion is curved; , Do the said ridge line , Characterized in that with regulating the curvature of the intermediate sheet portion to the other side, it is intended to encourage the curvature of the intermediate sheet portion to the one side. Further, according to the present invention, among the sheets, a first sheet portion, a second sheet portion separated from the first sheet portion in the sheet conveyance direction, and the first sheet portion and the second sheet portion. an intermediate sheet portion, wavy folds, and those containing both the folding lines provided on said sheet and folding position before the fold is provided in the seat, when the defined respectively, said at the corrugated folds intermediate sheet A sheet folding device for folding a portion, wherein the wave-like folds are a plurality of line segments connected in a zigzag shape, and extend so as to cross the transport direction and are arranged at predetermined intervals in the transport direction There, the one-side curved unit for curving the corrugated folds of the intermediate sheet portion to the one side, and the folding unit folding in the undulating folds curved, Bei example, said one side curved units, Note that the upstream clamp member capable of gripping the first sheet portion, the downstream clamp member capable of gripping the second sheet portion, and the upstream clamp member on the other side with reference to the transport path A control plate for controlling each unit is provided, and the control plate is provided with a ridge line protruding toward the transport path, and the control device is provided with the wavelike shape. Movement of at least one of the upstream clamp member and the downstream clamp member so that the relative distance between the upstream clamp member and the downstream clamp member is reduced so that the intermediate sheet portion including the fold is curved. The ridge line restricts the curvature of the intermediate sheet portion to the other side and promotes the curvature of the intermediate sheet portion to the one side .

According to the present invention, of the sheets, a first sheet portion, a second sheet portion separated from the first sheet portion in the sheet conveying direction, and an intermediate sheet between the first sheet portion and the second sheet portion and parts, wavy folds, and those containing both the fold lines provided on the seat and before the folding position where the fold is provided in the seat, when defining each said intermediate sheet portion in the corrugated folds In the sheet folding apparatus, the wave-like folds are a plurality of line segments connected in a zigzag shape and extend so as to cross the conveying direction and are arranged at predetermined intervals in the conveying direction. wherein the one side curved unit to the corrugated folds of the intermediate sheet portion is bent to one side, and the folding unit folding in the undulating folds curved, Bei example, said folding unit, curved The press unit is provided with a press unit for pressing the folds, and the press unit forms the wavy folds with a first press pair disposed on both sides so as to sandwich the first line segment forming the wavy folds. And a second press pair disposed on both sides of the second line segment, the second press pair being adjacent to the first press pair with respect to the longitudinal direction of the wavy folds. The first press pair and the second press pair may be spaced apart and spaced apart to escape the inflection of the wavy fold .

According to the present invention, of the sheets, a first sheet portion, a second sheet portion separated from the first sheet portion in the sheet conveying direction, and an intermediate sheet between the first sheet portion and the second sheet portion and parts, wavy folds, the fold line provided on the sheet, when the defined respectively, said a sheet folding apparatus for folding the intermediate sheet portion in the corrugated folds, the wavy folds, a plurality of line segments One side bending unit extending in a zigzag shape and extending in such a manner as to cross the conveying direction and arranged at a predetermined interval in the conveying direction, and curving the wavy fold of the intermediate sheet portion to one side If, e Preparations and folding unit folding in the undulating folds curved, and the one side curved unit, an upstream roller pair capable of grasping and feeding of the first sheet portion, said second sheet Control a pair of downstream side roller pairs capable of gripping and feeding, a restriction plate disposed between the upstream side roller pair and the downstream side roller pair on the other side with reference to the transport path, and each unit A control device, wherein the control device can individually rotate the upstream drive roller forming the upstream roller pair and the downstream drive roller forming the downstream roller pair in forward and reverse directions; The restriction plate includes a ridge line protruding toward the conveyance path, and the control device is configured to control the first sheet portion by the upstream roller pair so that the intermediate sheet portion including the wavy fold is curved. Feeding to the downstream side in the carrying direction and feeding to the upstream side of the carrying direction of the second sheet portion by the downstream roller pair are performed, and the ridge line curves the intermediate sheet portion to the other side. In addition to regulating The folding unit is configured to promote bending of the intermediate sheet portion toward the one side, and the folding unit is configured to control the first pair of upstream side rollers and the pair of downstream side rollers by the control device. And a second bending state in which the wavy fold line is more curved than the first bending state . Further, according to the present invention, among the sheets, a first sheet portion, a second sheet portion separated from the first sheet portion in the sheet conveyance direction, and the first sheet portion and the second sheet portion. an intermediate sheet portion, wavy folds, the fold line provided on the sheet, when the defined respectively, said a sheet folding apparatus for folding the intermediate sheet portion in the corrugated folds, the wavy folds, a plurality of lines The portions extend in a zigzag shape and extend so as to cross the conveying direction and are arranged at predetermined intervals in the conveying direction, and one side which curves the wavy fold of the intermediate sheet portion to one side a curved unit, a folding unit folding in the undulating folds curved, Bei example, said one side curved units, the a first sheet portion upstream clamping member grippable is, the second Sea Control for controlling each unit, a downstream clamp member capable of holding the part, a restriction plate disposed between the upstream clamp member and the downstream clamp member on the other side with reference to the transport path, and And the control plate includes a ridge line protruding toward the transport path, and the control device causes the upstream clamp member and the upstream clamp member to bend the intermediate sheet portion including the wavy folds. At least one of the upstream clamp member and the downstream clamp member is moved so that the relative distance to the downstream clamp member is reduced, and the ridge line regulates the curve of the intermediate sheet to the other side. Simultaneously with the bending of the intermediate sheet portion to the one side, and the folding unit includes the upstream clamp member and the downstream clamp by the control device. Through the control of wood, first a curved state where the wavy folds curved, and a second bending state in which the wavy folds curved larger than the first bending state, to switch alternately between the It features.

According to the present invention, of the sheets, a first sheet portion, a second sheet portion separated from the first sheet portion in the sheet conveying direction, and a first sheet portion and a second sheet portion. an intermediate sheet portion, wavy folds, and those containing both the fold lines provided on the seat and before the folding position where the fold is provided in the seat, when defining each said sheet by said corrugated folds In the method for manufacturing a folded body, the wave-like folds are formed by connecting a plurality of line segments in a zigzag manner, and extend so as to cross the conveyance direction and are arranged at predetermined intervals in the conveyance direction. It is those comprising a one-side curved step of bending the first intermediate sheet portion to the one side, and a one-side folding step of folding in the one said corrugated folds with curved sides, the one side Gulf In the step, in a state where the first intermediate sheet portion is opposed to the other side regulation plate disposed on the other side with respect to the sheet conveyance path, the conveyance to the upstream side of the second sheet portion and the first Conveying to the downstream side of the sheet portion is performed, and the other side regulation plate includes the other side ridge line protruding toward the conveyance path, and the other side ridge line curves the intermediate sheet portion to the other side. While restricting and promoting the curving of the intermediate sheet portion to the one side, in the one side folding step, using the press unit disposed on one side with reference to the conveyance path of the sheet, the one side is used. And pressing the wavy folds of the first intermediate sheet portion that is curved . Further, according to the present invention, among the sheets, the first sheet portion, the second sheet portion separated from the first sheet portion in the sheet conveying direction, and the first sheet portion and the second sheet portion. The first intermediate sheet portion and the wavy fold are a method of manufacturing a foldable body formed by folding the sheet by the wavy fold when the fold line provided in the sheet is defined respectively, and the wavy fold is A plurality of line segments extend in a zigzag shape and extend so as to intersect the conveying direction and are arranged at a predetermined interval in the conveying direction, and curving the first intermediate sheet portion to one side on the other hand the side curved step, and a step folding one side fold in the undulating folds curved to the one side, in the one side curved step, disposed on the other side relative to the conveying path of the sheet In the state where the first intermediate sheet portion faces the other side regulation plate, the conveyance to the upstream side of the second sheet portion and the conveyance to the downstream side of the first sheet portion are performed, and the other side regulation plate A second side ridge line protruding toward the transport path, the second side ridge line restricts the bending of the intermediate sheet portion to the other side, and promotes the bending of the intermediate sheet portion to the one side In the one-side folding step, the first curved state in which the wavy folds of the first intermediate sheet portion are curved, and the second curved state in which the wavy folds are curved more than the first curved state. It is characterized by alternately switching between the state and the state .

According to the present invention, of the sheets, a first sheet portion, a second sheet portion separated from the first sheet portion in the sheet conveying direction, and an intermediate sheet between the first sheet portion and the second sheet portion And the wavy folds are defined as including the fold position before the fold is provided to the sheet and the fold line provided to the sheet, respectively, when the corrugated fold is used to define the intermediate sheet portion In the sheet folding apparatus, the wave-like folds are a plurality of line segments connected in a zigzag shape and extend so as to cross the conveying direction and are arranged at predetermined intervals in the conveying direction. And a folding unit configured to fold the wavy folds of the intermediate sheet portion toward one side, and a folding unit configured to fold the wavy folds of the intermediate sheet portion, And gripping and feed capable upstream roller pair of the sheet portion, the the gripping and feed capable downstream roller pair of the second sheet portion, the upstream roller pair a second side with respect to the conveying path and A control plate is disposed between the downstream roller pair and a control device that controls each unit, and the control device forms an upstream drive roller forming the upstream roller pair and the downstream roller pair. The control plate is capable of individually rotating in the forward and reverse directions with the downstream drive roller, the restriction plate includes a ridge line protruding toward the transport path, and the control device includes the intermediate sheet portion including the wavy fold. Sending the first sheet portion by the upstream side roller pair to the downstream side in the transport direction of the first sheet portion and feeding the second sheet portion by the downstream side roller pair to the upstream side of the transport direction so that And the ridge line is Thereby regulating the curvature of the intermediate sheet portion to the serial other side, wherein said at while those prompting the curvature of the intermediate sheet portion to the side. Further, according to the present invention, among the sheets, a first sheet portion, a second sheet portion separated from the first sheet portion in the sheet conveyance direction, and the first sheet portion and the second sheet portion. When the intermediate sheet portion and the wavy folds are defined to include both the fold position before the fold is provided to the sheet and the fold line provided to the sheet, when the corrugated fold is defined as the intermediate sheet A sheet folding device for folding a portion, wherein the wave-like folds are a plurality of line segments connected in a zigzag shape, and extend so as to cross the transport direction and are arranged at predetermined intervals in the transport direction A bending unit that bends the wavy folds of the intermediate sheet portion to one side, and a folding unit that folds the curved folds with the wavy folds; Note that the upstream clamp member capable of gripping the first sheet portion, the downstream clamp member capable of gripping the second sheet portion, and the upstream clamp member on the other side with reference to the transport path A control plate for controlling each unit is provided, and the control plate is provided with a ridge line protruding toward the transport path, and the control device is provided with the wavelike shape. Movement of at least one of the upstream clamp member and the downstream clamp member so that the relative distance between the upstream clamp member and the downstream clamp member is reduced so that the intermediate sheet portion including the fold is curved. The ridge line restricts the curvature of the intermediate sheet portion to the other side and promotes the curvature of the intermediate sheet portion to the one side.

  According to the present invention, of the sheets, a first sheet portion, a second sheet portion separated from the first sheet portion in the sheet conveying direction, and an intermediate sheet between the first sheet portion and the second sheet portion And the wavy folds are defined as including the fold position before the fold is provided to the sheet and the fold line provided to the sheet, respectively, when the corrugated fold is used to define the intermediate sheet portion In the sheet folding apparatus, the wave-like folds are a plurality of line segments connected in a zigzag shape and extend so as to cross the conveying direction and are arranged at predetermined intervals in the conveying direction. The intermediate sheet portion includes a one-side bending unit that bends the wavy folds to one side, and a folding unit that folds at the curved wavy folds, and the folding unit is curved. The press unit is provided with a press unit for pressing the folds, and the press unit forms the wavy folds with a first press pair disposed on both sides so as to sandwich the first line segment forming the wavy folds. And a second press pair disposed on both sides of the second line segment, the second press pair being adjacent to the first press pair with respect to the longitudinal direction of the wavy folds. The first press pair and the second press pair may be spaced apart and spaced apart to escape the inflection of the wavy fold.

According to the present invention, of the sheets, a first sheet portion, a second sheet portion separated from the first sheet portion in the sheet conveying direction, and an intermediate sheet between the first sheet portion and the second sheet portion A sheet folding apparatus that folds the intermediate sheet portion at the wavy fold when the section and the wavy fold are defined as the fold lines provided on the sheet, and the wavy fold has a plurality of line segments One side bending unit extending in a zigzag shape and extending in such a manner as to cross the conveying direction and arranged at a predetermined interval in the conveying direction, and curving the wavy fold of the intermediate sheet portion to one side And a folding unit configured to fold at the curved folds, wherein the one-side bending unit includes an upstream roller pair capable of gripping and feeding the first sheet portion, and the second sheet. And provided a regulating plate between the between the gripping and feed capable downstream rollers, the upstream roller pair a second side with respect to the transport path and a downstream roller pair, control for controlling the respective units And the control device is capable of individually rotating in the forward and reverse directions the upstream drive roller forming the upstream roller pair and the downstream drive roller forming the downstream roller pair. The restriction plate includes a ridge line protruding toward the conveyance path, and the control device causes the conveyance of the first sheet portion by the upstream roller pair so that the intermediate sheet portion including the wavy fold is curved. Feeding to the downstream side and feeding to the upstream side of the transport direction of the second sheet portion by the downstream roller pair are performed, and the ridge line regulates the bending of the intermediate sheet portion to the other side. And the other The folding unit is configured to promote the bending of the intermediate sheet portion, and the folding unit is configured to control the first pair of upstream side rollers and the pair of downstream side rollers by the control device to form a first curve in which the wavy fold is curved. It is characterized by alternately switching between a state and a second bending state in which the wavy fold is curved more than the first bending state. Further, according to the present invention, among the sheets, a first sheet portion, a second sheet portion separated from the first sheet portion in the sheet conveyance direction, and the first sheet portion and the second sheet portion. An intermediate sheet portion and a wavy fold are sheet folding devices that respectively fold the intermediate sheet portion at the wavy fold when the fold line provided on the sheet is defined, and the wavy fold is a plurality of lines The portions extend in a zigzag shape and extend so as to cross the conveying direction and are arranged at predetermined intervals in the conveying direction, and one side which curves the wavy fold of the intermediate sheet portion to one side A bending unit, and a folding unit that folds at the curved wavy folds, wherein the one-side bending unit includes an upstream clamp member capable of gripping the first sheet portion, and the second sheet Gripping the downstream clamp member capable of parts, a regulating plate disposed between a second side with respect to the transport path the upstream clamp member and the downstream-side clamp member, the control device that controls each unit And the control plate includes a ridge line protruding toward the transport path, and the control device controls the upstream clamp member and the downstream portion so that the intermediate sheet portion including the wavy folds is curved. At least one of the upstream clamp member and the downstream clamp member is moved such that the relative distance to the side clamp member is reduced, and the ridge line regulates the curvature of the intermediate sheet to the other side. At the same time, the folding unit is configured to urge the bending of the intermediate sheet portion to the one side, and the folding unit includes the upstream clamp member and the downstream clamp member by the control device. Switching between the first curved state in which the wavy folds are curved and the second curved state in which the wavy folds are more curved than the first curved state through control; and Do.

According to the present invention, of the sheets, a first sheet portion, a second sheet portion separated from the first sheet portion in the sheet conveying direction, and a first sheet portion and a second sheet portion. When the intermediate sheet portion and the wavy fold include both the fold position before the fold is provided on the sheet and the fold line provided on the sheet, the corrugated fold is used to define the sheet. In the method for manufacturing a folded body, the wave-like folds are formed by connecting a plurality of line segments in a zigzag manner, and extend so as to cross the conveyance direction and are arranged at predetermined intervals in the conveyance direction. The one side bending step of curving the first intermediate sheet portion to one side, and the one side folding step of folding with the wave-like crease curved to the one side; In the step, in a state where the first intermediate sheet portion is opposed to the other side regulation plate disposed on the other side with respect to the sheet conveyance path, the conveyance to the upstream side of the second sheet portion and the first The conveyance to the downstream side of the sheet portion is performed, and the other side regulation plate includes the other side ridge line protruding toward the conveyance path, and the other side ridge line is the first intermediate sheet portion to the other side. While restricting a curve, it urges a curve of the first intermediate sheet portion to the one side, and in the one side folding step, a press unit disposed on one side with respect to the conveyance path of the sheet is used. It is characterized by performing press processing with respect to the said wavelike crease of the said 1st intermediate sheet part curved using one side. Further, according to the present invention, among the sheets, the first sheet portion, the second sheet portion separated from the first sheet portion in the sheet conveying direction, and the first sheet portion and the second sheet portion. The first intermediate sheet portion and the wavy fold are a method of manufacturing a foldable body formed by folding the sheet by the wavy fold when the fold line provided in the sheet is defined respectively, and the wavy fold is A plurality of line segments extend in a zigzag shape and extend so as to intersect the conveying direction and are arranged at a predetermined interval in the conveying direction, and curving the first intermediate sheet portion to one side The one side bending step and the one side folding step which folds at the one side curved with the wavy fold line are provided, and in the one side bending step, the one side bending step is disposed on the other side with reference to the sheet conveyance path. In the state where the first intermediate sheet portion faces the other side regulation plate, the conveyance to the upstream side of the second sheet portion and the conveyance to the downstream side of the first sheet portion are performed, and the other side regulation plate comprises other side ridge protruding toward the conveyance path, the other side edge line, as well as to regulate the bending of the first intermediate sheet portion to the other side, the first intermediate sheet portion to the one side In the one-side folding step, the first curved state in which the wavy folds of the first intermediate sheet portion are curved, and the wavy folds are curved larger than the first curved state. It is characterized in that switching is alternately performed between the second bending state.

Claims (13)

When the sheet is defined as a first sheet portion, a second sheet portion separated from the first sheet portion, and an intermediate sheet portion between the first sheet portion and the second sheet portion, the wavy fold line is defined. Sheet folding apparatus for folding the intermediate sheet portion,
A bending unit that bends the intermediate sheet portion;
A sheet folding apparatus comprising: a folding unit configured to fold a curved portion of the intermediate sheet portion.   The sheet folding apparatus according to claim 1, wherein the folding unit performs press processing on the curved portion in a free state.   The folding unit may control the bending unit to alternately switch the intermediate sheet portion between a first bending state and a second bending state different from the first bending state. The sheet folding apparatus according to claim 1, characterized in that   It has a free state structure that brings the intermediate sheet portion between the portion to be pressed and the portion held by the bending unit into a free state when the bending portion is pressed. The sheet folding apparatus according to claim 2, wherein   5. The sheet folding apparatus according to claim 2, wherein the folding units are spaced apart and aligned in the direction of the wavy folds. It further comprises a regulating unit that regulates the direction in which the intermediate sheet portion curves.
The sheet folding device according to any one of claims 1 to 5, wherein the restriction unit is disposed at a position at which the bending of the intermediate sheet portion is suppressed.   The sheet folding apparatus according to any one of claims 1 to 6, wherein the bending unit and the folding unit perform valley folding of the sheet along with mountain folding of the sheet. A sheet folding apparatus that folds a sheet at a plurality of crossing folds that cross the peak fold and the valley fold with respect to a sheet in which the peak fold and the valley fold are alternately arranged,
A first pressing member pressing against the valley fold line of the cross fold from the first side with respect to the sheet;
A second pressing member pressing against the valley fold line of the crossing fold from the second side opposite to the first side;
A pressing member moving unit that performs relative movement between the first pressing member and the second pressing member;
And a folding unit configured to fold the sheet in a state of being folded by the first pressing member and the second pressing member.
The pressing member moving unit can switch the first pressing member between a first state where the first pressing member is positioned between the plurality of second pressing members and a second state where the first pressing member is retracted from the first state. Sheet folding apparatus characterized in that. The first pressing member and the second pressing member are formed in a plate shape,
The first pressing member supports the valley fold side pressing line located at the center of the sheet,
The pressing member moving unit moves the first pressing member and the second pressing member separately in the thickness direction and the plate surface direction,
The first pressing member and the second pressing member approach in the thickness direction and also approach in the plate surface direction due to relative movement by the pressing member moving unit. Sheet folding device. The folding unit is
A pair of press blocks having a press surface for pressing the sheets;
A press block moving mechanism for relatively moving the pair of press blocks;
The plurality of second pressing members are disposed between the pair of press blocks,
The press block moving mechanism brings the press block closer from both sides of the first pressing member when the first pressing member supporting the sheet is in the first state. The sheet folding device according to 8 or 9. The first pressing member and the second pressing member have contact sides touching the sheet,
The sheet folding device according to any one of claims 8 to 10, wherein the contact side is oblique to the placement surface on which the sheet is placed. When the sheet is defined as a first sheet portion, a second sheet portion separated from the first sheet portion, and an intermediate sheet portion between the first sheet portion and the second sheet portion, the intermediate sheet A method of manufacturing a folded body in which the parts are folded,
A bending step of bending the intermediate sheet portion;
And folding the curved portion of the intermediate sheet portion. A manufacturing method of a folded body in which mountain folds and valley folds are alternately performed on a sheet in which the mountain folds and the valley folds are alternately arranged at a plurality of intersection folds crossing the mountain folds and the valley folds,
The valley fold line of the intersection fold is pressed from the first side with respect to the sheet, and the valley fold line of the intersection fold is from the second side opposite to the first side. Bending process, pressing and bending the sheet,
A folding step of folding the sheet in a state of being folded by the first pressing member and the second pressing member.

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