JP2008019090A - Web folding device and rotary press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrict end-bending by stabilizing the behavior of a section over the whole range in the width direction, in regard to a web folding device and a rotary press. <P>SOLUTION: A saw drum 24 for cutting a web W and a pair of folding rollers 39a and 39b for forming a section S by pinching the web W are provided in relation to a rotatable folding drum 23. The peripheral surface of the folding drum 23 is provided with a first guide surface 51 recessed from the peripheral surface and having a predetermined length along the axial direction from a folded side to a free side, and a second guide surface 52 formed into an even arc shape along the circumferential direction on the free side of the section S is continuously provided to the first guide surface 51 in the axial direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a web folding apparatus that forms a folded book by sandwiching a cut web between a pair of folding rollers, and a rotary printing press to which the web folding apparatus is applied.

  A general web offset press for newspaper includes a plurality of paper feeding devices, a plurality of printing units, a turn bar device, and a folding machine, and a web is supplied from each paper feeding device to the printing unit. And printing is performed on each web W, and after a plurality of web traveling routes are changed by the turn bar device, the webs are overlapped in a predetermined order, and then the web is vertically folded by a folding machine. The paper is cut horizontally and then folded to form a folded book, which is discharged.

  A folding machine in such a newspaper offset rotary printing press is provided with a saw cylinder and a folding cylinder facing each other below a triangular plate for longitudinal folding, and a pair of folding rollers provided below the folding cylinder, An impeller for discharging the folded book is provided below the folding roller. The saw cylinder is provided with a saw blade on the outer peripheral portion, while the folding cylinder is provided with a saw blade receiver for receiving the saw blade on the outer peripheral portion. Further, the folding cylinder is provided with a needle device and a folding blade at an outer peripheral portion at a predetermined interval in the circumferential direction.

  Therefore, when a plurality of webs stacked in a predetermined order are vertically folded by a triangular plate and then sent to the folding cylinder by various rollers, first, the tip portions are held by the needle device at a predetermined position. In this state, when the folding cylinder rotates by a predetermined angle, the saw blade and the saw blade support coincide with each other, and the web W is cut by a predetermined length by the saw blade and the web is held by the needle device. Canceled. Subsequently, the folding blade of the folding cylinder rotates so that the tip portion protrudes from the circumferential surface of the folding cylinder, and the web is peeled off from the circumferential surface of the folding cylinder. At this time, when the folding blade rotates in the opposite direction with respect to the rotation of the folding cylinder, the blade body protrudes outward from the circumferential surface of the folding cylinder, and the tip part is abutted against the intermediate part in the web feed direction and pushed out. The web can be peeled off from the circumferential surface of the folding cylinder. Then, a pair of folding rollers sandwich the web peeled off from the peripheral surface of the folding cylinder to form a folded book, which is sequentially received by the impeller and discharged.

  By the way, the tip portion of the web held by the needle device is released from the needle device after passing over the folding roller, but is pushed back by the folding blade from the center, and is therefore pulled back to the folding roller side. In addition, there is a possibility that fluttering may occur at the tip which becomes the free end. In this case, the pair of folding rollers winds and holds the fold in a folded state or a state with a crease, and discharges it as a folded book with an end fold or a crease. Further, since the rear end portion of the web held by the needle device moves in the same direction as the rotation of the folding cylinder, the inertia of the web particularly before the rear end portion serving as the free end passes through the pair of folding rollers. The web is easily influenced by the air flow caused by the rotation of the folding cylinder and the folding roller, and is caused to flow to the right side of the front end of the web. Therefore, end breakage is likely to occur by passing between the pair of folding rollers in a state in which the rear end portion of the web is folded.

  As what solves such a problem, there exists a thing described in the following patent document 1, for example. In the web folding device described in Patent Document 1, a recess is formed in the axial direction of the folding cylinder on the upstream side in the folding cylinder rotation direction of the folding blade on the peripheral surface of the folding cylinder, and the folding roller of the folding roller is formed by this recess. The space around the upper part is widened to suppress air turbulence, and the rear end of the web enters the recess to stabilize the behavior of the rear end of the web, and the rear end of the web immediately before passing between the folding rollers. It prevents fluttering and prevents edge breakage.

JP 2005-289550 A

  By the way, a folded book formed by a rotary machine of a rotary printing press is formed in a state where a plurality of webs are overlapped, and a large number of sheets passed from a folding machine to a pair of folding rollers are vertically folded. The web has a bag shape in which one side portion in the transfer direction is folded, and the other side portion has a peller shape. Therefore, as in the conventional web folding device described above, when a recess is formed in the circumferential surface of the folding cylinder over the axial direction, the rear end of the web is guided in the recess by the recess of the folding cylinder on the bag side of the web. Although it can be passed smoothly to the folding roller, on the web peller side, the space around the upper part of the folding roller is wide, so the behavior of the rear end of the web is increased, flapping is promoted, and end folding occurs. May occur.

  This invention solves the subject mentioned above, and it aims at providing the web folding apparatus and rotary printing machine which can suppress edge folding by stabilizing a behavior over the whole area of the width direction in a folding book.

  In order to achieve the above object, a web folding apparatus according to the invention of claim 1 is provided with a rotatable folding cylinder, a saw cylinder for cutting the web in cooperation with the folding cylinder, and a downstream side of the folding cylinder. In the web folding device comprising a pair of folding rollers that sandwich the web and form a folding book, the folding cylinder has a predetermined length along the axial direction from the bag side of the folding book toward the peller side A first guide surface is provided that is recessed from the outer peripheral surface.

  In the web folding apparatus according to the second aspect of the present invention, a second guide surface having a uniform arc shape along the circumferential direction is continuous with the first guide surface in the axial direction on the peller side of the folding book in the folding cylinder. It is characterized by being provided.

  In the web folding apparatus according to the invention of claim 3, the third guide surface protruding from the outer peripheral surface is provided continuously on the first guide surface in the axial direction on the peller side of the folding book in the folding cylinder. It is characterized by.

  In the web folding apparatus according to the invention of claim 4, the first guide surface and the second guide surface, or the first guide surface and the third guide surface are smoothly continuous along the axial direction. It is said.

  In the web folding apparatus according to the invention of claim 5, the distance between the outer peripheral surface of the folding cylinder is increased on the outer peripheral surfaces of the pair of folding rollers at both axial ends, and the rear end portion of the folding book is fluttered. And a fourth guide surface for reducing the distance from the outer peripheral surface of the folding cylinder is provided at the notch portion of the folding roller located on the side of the folding book. It is said.

  In the web folding device according to the sixth aspect of the present invention, a groove is formed in the folding cylinder along the axial direction, and the first block body having the first guide surface is fixed from the bag side of the folded book to the center of the groove. On the other hand, the second block body having the second guide surface or the third block body having the third guide surface is fixed to the peg side of the signature in the groove portion.

  According to a seventh aspect of the present invention, there is provided a rotary printing machine comprising: a plurality of paper feeding devices that supply a web from a web; a plurality of printing units that perform printing on the web fed from the paper feeding device; and printing by the plurality of printing units. In a rotary printing press provided with a folding machine that forms a folded book by cutting and bending a plurality of webs that have been applied, the folding machine includes a rotatable folding cylinder, and the folding cylinder. A saw cylinder that works to cut the web, and a pair of folding rollers that are provided downstream of the folding cylinder and sandwich the web to form a folding book, and the folding cylinder has a folding bag side A first guide surface that is recessed from the outer peripheral surface having a predetermined length along the axial direction from the side toward the peller side is provided.

  According to the web folding device of the first aspect of the present invention, a rotatable folding cylinder, a saw cylinder that cuts the web, and a pair of folding rollers that sandwich the web to form a folded book are provided. Since the first guide surface that is recessed from the outer peripheral surface having a predetermined length along the axial direction from the bag side of the folding book toward the peller side is provided, the web is transferred from the folding cylinder to the pair of folding rollers. When the folded sheet is formed, the bag side at the rear end portion of the web is restrained from air turbulence because the space above the folding roller is widened by the first guide surface. The behavior is stable because it is guided by entering the first guide surface in which the rear end is recessed. On the other hand, the upper side of the folding roller is not widened on the peller side at the rear end of the folding book. If the rear end of the book is securely guided by the outer peripheral surface of the folding cylinder Sticks is prevented, thereby preventing the Hashore of the rear end of the signature.

  According to the web folding device of the invention of claim 2, the second guide surface having a uniform arc shape along the circumferential direction is continuously provided in the axial direction on the first guide surface on the peller side of the folding book in the folding cylinder. Since the web is transferred from the folding cylinder to the pair of folding rollers to form the folded book, the second guide having a uniform circular arc shape in the circumferential direction is formed at the rear end of the folded book. By being reliably guided by the surface, flapping of the rear end portion of the folding book can be prevented, and end folding of the rear end portion of the folding book can be reliably prevented.

  According to the web folding device of the invention of claim 3, since the third guide surface protruding from the outer peripheral surface is provided continuously on the first guide surface in the axial direction on the peller side of the folding book in the folding cylinder, the web Is transferred from the folding cylinder to the pair of folding rollers to form a folded book, because the upper space of the folding roller is narrowed by the third guide surface on the peller side at the rear end portion of the folded book The back end of the folded book is properly supported to prevent flapping, and the end folding of the rear end of the folded book can be reliably prevented.

  According to the web folding device of the invention of claim 4, since the first guide surface and the second guide surface or the first guide surface and the third guide surface are smoothly continuous along the axial direction, the outer periphery of the folding cylinder There is no step on the surface along the axial direction, and the signature can be stably supported.

  According to the web folding device of the fifth aspect of the present invention, the distance between the outer peripheral surface of the folding cylinder is increased on the outer peripheral surfaces of the pair of folding rollers at both axial ends, and the rear end portion of the folding book is fluttered. And a fourth guide surface for reducing the distance from the outer peripheral surface of the folding cylinder is provided at the notch portion of the folding roller located on the peller side of the folding book. When the folded book is formed by being transferred to the folding roller, the notch portions formed in the pair of folding rollers can suppress fluttering of the rear end portion of the folded book, and the folding roller can be formed by the fourth guide surface. The upper space can be optimized, and the rear end of the folding book is properly supported to prevent fluttering, and the folding of the rear end of the folding book can be reliably prevented.

  According to the web folding apparatus of the sixth aspect of the present invention, a groove is formed in the folding cylinder along the axial direction, and the first block body having the first guide surface is fixed from the bag side of the folded book to the center of the groove. On the other hand, since the second block body having the second guide surface or the third block body having the third guide surface is fixed to the peller side of the folded book in the groove portion, a groove portion is formed in the folding cylinder, and a plurality of the groove portions are formed in the groove portion. By fixing the block body, the first guide surface, the second guide surface or the third guide surface can be easily formed on the outer peripheral surface of the folding cylinder, and the manufacturability can be improved.

  According to the rotary printing press of the invention of claim 7, it is constituted by a paper feeding device, a plurality of printing units and a folding machine, and this folding machine is constituted by a folding cylinder, a saw cylinder and a folding roller, and is folded into the folding cylinder. Since the first guide surface that is recessed from the outer peripheral surface having a predetermined length along the axial direction from the bag side of the book toward the peller side is provided, the web is transferred from the folding cylinder to the pair of folding rollers. When the folded book is formed, the bag side at the rear end of the folded book is restrained by air turbulence because the space above the folding roller is widened by the first guide surface, and the back of the folded book The behavior is stable because it is guided by entering the first guide surface in which the end is recessed. On the other hand, since the space above the folding roller is not wide on the peller side at the rear end of the folding book, the folding book The back end of the back is securely guided by the outer peripheral surface of the folding cylinder to prevent fluttering. The Hashore end can be prevented reliably, thereby improving the print quality.

  Exemplary embodiments of a web folding device and a rotary printing press according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example.

  1 is a schematic diagram showing the relationship between a folding cylinder and a folding roll in a web folding apparatus according to a first embodiment of the present invention, FIG. 2 is a schematic perspective view of a folding cylinder in the web folding apparatus according to the first embodiment, and FIG. 2 is a sectional view taken along the line III-III in FIG. 2, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2, FIG. 5 is a schematic perspective view of a folding roll in the web folding apparatus according to the first embodiment, and FIG. Schematic for explaining the distance between the folding cylinder and the folding roll in the web folding device, FIGS. 7-1 and 7-2 represent the behavior of the bag bag side rear end portion in the web folding device of the first embodiment. Schematic diagrams, FIGS. 8-1 and 8-2 are schematic diagrams showing the behavior of the rear end portion of the web on the side of the web in the web folding apparatus according to the first embodiment, and FIG. 9 shows the web folding apparatus according to the first embodiment. FIG. 10 is a schematic diagram showing an offset rotary press for newspapers. FIG. 11 is a schematic diagram illustrating a main part of the web folding apparatus according to the first embodiment, and FIG. 11 is a schematic diagram illustrating a main part of the web folding apparatus according to the first embodiment.

  In the first embodiment, as shown in FIG. 9, a newspaper offset rotary printing press 10 applied as a rotary printing press includes a plurality of paper feeding devices 11, a plurality of printing units 12, a turn bar device 13, and a folding machine. (Web folding device) 14. Each paper feeding device 11 is provided with a holding arm 15 for holding three webs R each having a web W wound in a roll shape. By rotating the holding arm 15, the webs R are fed. Can be rotated to a position. Each paper feeding device 11 is provided with a paper splicing device (not shown), and when the web R fed out at the paper feeding position becomes small, the paper splicing device causes the paper web R at the paper feeding position to be removed. Thus, the web R in the standby position can be spliced.

  In addition, the printing unit 12 is provided with a multi-color printing unit 16 for performing double-sided four-color printing, and a two-color printing unit 17 for performing double-sided two-color printing. The multi-color printing unit and the 16-color printing unit and the two-color printing unit can perform predetermined printing on the web W supplied from each paper feeding device 11. In this embodiment, the printing unit 12 is composed of the multi-color printing unit 16 and the two-color printing unit 17, but the present invention is not limited to this configuration. For example, various units may be used in combination as appropriate according to the printed matter, such as a double-sided single-color printing unit that performs single-sided printing on both sides and a multicolor printing unit that performs four-color or two-color printing on one side.

  In addition, the turn bar device 13 is provided with a number of turn bars (not shown), and the travel route of each web W sent from each printing unit and 16 and 17 can be changed and overlapped in a predetermined order. The folding machine 14 overlaps and vertically folds a plurality of webs W fed from the turn bar device 13, cuts horizontally by a predetermined length, further folds horizontally to form a desired folding book, and then discharges the paper. is there.

  The folding machine 14 will be described in detail. As shown in FIG. 10, a drag roller 21 is provided at the top to carry the web W stacked in a predetermined order by the turn bar device 13 described above downward. A triangular plate 22 for folding is provided. Below, a folding cylinder 23 and a saw cylinder 24 for transversely cutting the vertically folded web W are arranged to face each other. A pair of lead-in rollers 25, a pair of nipping rollers 26, a guide roller 27, and a pair of nipping rollers 28 are provided between the triangular plate 22 and the folding cylinder 23 and the saw cylinder 24.

  As shown in FIG. 11, the folding cylinder 23 is provided with a needle device 29 so as to face the circumferential surface thereof by 180 degrees. Each needle device 29 has the same configuration, a needle shaft 30 provided along the axial direction of the folding cylinder 23, a needle arm 31 having a proximal end fixed to the needle shaft 30, and the needle arm 31. And a needle 32 fixed to the distal end portion. The needle device 26 is operated in conjunction with the rotation of the folding cylinder 23, and protrudes outwardly through the needle arm 31 at a predetermined position, whereby the tip in the running direction of the web W is obtained. Can be held, and the holding of the tip of the web W can be released by returning the needle 32 via the needle arm 31 at a predetermined position.

  Further, the folding cylinder 23 is provided with a saw blade receiver 33 at substantially the same position as the needle device 29 so as to face the peripheral surface thereof by 180 degrees, and this saw blade receiver 33 is generally constituted by an elastic body such as rubber. Has been. On the other hand, the saw body 24 is provided with a saw blade 34 supported by a saw base 35 so as to face the peripheral surface thereof by 180 degrees. In this case, the folding cylinder 23 and the saw cylinder 24 are synchronously rotated at the same peripheral speed, so that the rotation phases thereof coincide with each other so that the saw blade 34 and the saw blade receiver 33 face each other at a constant period. Therefore, when the folding cylinder 23 and the saw cylinder 24 rotate synchronously and the saw blade 34 and the saw blade receiver 33 face each other and coincide with each other, the web W can be cut horizontally by the saw blade 34.

  Further, the folding cylinder 23 is provided with a folding blade 36 supported by a folding shaft 37 so as to face the circumferential surface thereof by 180 degrees, and the folding blade 36 is positioned approximately 90 degrees out of phase with the needle device 29. ing. As will be described later, the folding blade 36 is configured by integrally forming a large number of blade main bodies in the width direction so as to form a comb shape, and the tip of each blade main body can protrude outward from the guide plate 38. It has become. The folding blade 36 can be rotated in the reverse direction in synchronism with the folding cylinder 23 by the folding shaft 37, and the front end of the folding blade 36 from the circumferential surface of the folding cylinder 23 (guide plate 38) at a predetermined position. By projecting outward, the web W cut by the saw blade 34 can be peeled off from the peripheral surface of the folding cylinder 23.

  A pair of folding rollers 39a and 39b are provided below the folding cylinder 23 so as to be able to rotate synchronously with the folding cylinder 23. A pair of paper guides are provided below the folding cylinder 23 on both sides of each folding roller 39a and 39b. 40 is provided. The pair of folding rollers 39a and 39b can form the folded book S by sandwiching the web W protruding from the peripheral surface of the folding cylinder 23 by the folding blade 36. At this time, the pair of paper guides 40 are , Guide so that the rear end portion of the folding book S (web W) does not unravel.

  An impeller 41 is provided below the folding rollers 39 a and 39 b, and a discharge conveyor 42 is provided below the impeller 41. The impeller 41 has a plurality of blades 43 in the circumferential direction, and rotates in synchronization with the folding rollers 39a and 39b, so that the folding book S formed by the pair of folding rollers 39a and 39b is moved to each blade. 43 can be sequentially received and delivered onto the paper discharge conveyor 42.

  Therefore, in the newspaper offset rotary printing press 10 of this embodiment configured as described above, first, as shown in FIGS. When the web W is supplied to the two-color printing unit 17, the four-color printing or the two-color printing is performed on each web W in each printing unit 16, 17. Next, a large number of webs W printed by the printing units 16 and 17 are overlapped in a predetermined order while the travel route is changed by the turn bar device 13. In the folding machine 14, the web W guided by the drag roller 21 is vertically folded by the triangular plate 22, and then sent to the folding cylinder 23 by the lead-in roller 25, the nipping roller 26, the guide roller 27, and the nipping roller 28. .

  When the vertically folded web W reaches the folding cylinder 23, the needle device 29 is operated at a predetermined position to project the needle 32 outward, whereby the leading end of the web W is pierced and held. In this state, when the folding cylinder 23 continues to rotate, the web W moves while being held on the peripheral surface of the folding cylinder 23. When the saw blade 34 and the saw blade receiver 33 face each other and coincide with each other at a predetermined position, the web W is cut horizontally by the saw blade 34. Subsequently, the needle device 29 is operated to return the needle 32, thereby releasing the holding of the leading end of the web W, and the folding blade 36 is rotated so that the leading end is outward from the circumferential surface of the folding cylinder 23. The web W is peeled off from the peripheral surface of the folding cylinder 23 by protruding.

  Then, the web W protruding from the peripheral surface of the folding cylinder 23 is sandwiched between the pair of folding rollers 39a and 39b, whereby the folded book S is formed. Then, the booklet S formed by the folding rollers 39a and 39b is sequentially received by the blades 43 of the impeller 41 and delivered onto the paper discharge conveyor 42.

  By the way, in such a folding machine 14, when the web W is delivered from the folding cylinder 23 to the folding rollers 39a and 39b, an intermediate portion of the web W is sandwiched between the pair of folding rollers 39a and 39b. The leading end portion of the web W from which the holding of the needle device 29 is released and the rear end portion of the web W cut by the saw cylinder 24 become free ends, and thus fluttering occurs. For this reason, the web W may pass between the pair of folding rollers 39a and 39b in a state in which each end of the web W is folded. In this case, the folded book S is folded or wrinkled. In addition, the folded book S is formed in a state where a plurality of webs W are overlapped, and the web W which is stacked and vertically folded is formed in a bag shape on one side in the transfer direction. The side has a peller shape. Therefore, since the form and thickness of the web W are different between the bag side and the peller shape, the behavior when passing between the pair of folding rollers 39a and 39b is different.

  Therefore, in the present embodiment, as shown in FIG. 1, the folding cylinder 23 has a first recess recessed from the outer peripheral surface having a predetermined length along the axial direction from the bag side of the book S to the peller side. A guide surface 51 is provided, and a second guide surface 52 having a uniform arc shape along the circumferential direction is provided continuously on the first guide surface 51 in the axial direction on the peller side of the signature S.

  Here, the first guide surface 51 and the second guide surface 52 and the folding rollers 39a and 39b in the folding cylinder 23 will be described in detail.

  In the folding cylinder 23, a first guide surface 51 and a second guide surface 52 are formed between the needle device 29 and the saw blade receiver 33 and the folding blade 36 in the circumferential direction. The second guide surface 52 is provided adjacent to the saw blade receiver 33. That is, the needle device 29, the saw blade receiver 33, the first guide surface 51, the second guide surface 52, and the folding blade 36 are located side by side from the upstream side in the rotation direction of the folding cylinder 23. In this case, the first guide surface 51 has a concave shape recessed with respect to the outer peripheral surface of the folding cylinder 23, and the second guide surface 52 has an arc shape continuous with the outer peripheral surface of the folding cylinder. The length of the second guide surface 52 is preferably about 1/3 to 1/5 of the axial length of the folding cylinder 23. If the length of the second guide surface 52 is too short, If the signature S cannot be guided to the end, and if it is too long, the guide by the first guide surface 51 becomes insufficient.

  As shown in FIG. 1 to FIG. 4, the first guide surface 51 and the second guide surface 52 have a groove 53 formed in the outer peripheral surface of the folding cylinder 23 along the axial direction. The first block body 54 formed with the first guide surface 51 corresponding to the region extending from the bag side of the signature S to the central portion is fitted to 53 and fixed by a plurality of fastening bolts 55. A second block body 56 having a second guide surface 52 formed in the groove 53 corresponding to the area on the peller side of the signature S is fitted and fixed by a plurality of fastening bolts 57. Through holes 54a and 56a are formed in the block bodies 54 and 56, and the fastening bolts 55 and 57 pass through the through holes 54a and 56a in a state where the block bodies 54 and 56 are fitted in the groove 51. Then, the block bodies 54 and 56 are fixed to the folding cylinder 23 by being screwed to the bottom of the groove 51. In this case, each block body 54 and 56 is fixed to the folding cylinder 23 in a state where the opposing end surfaces are in close contact with each other, so that the first guide surface 51 and the second guide surface 52 are in the axial direction of the folding cylinder 23. It will be formed continuously.

  On the other hand, in the folding rollers 39a and 39b, as shown in FIGS. 1 and 5, the outer peripheral surface on one end side in the axial direction is increased in distance from the outer peripheral surface of the folding cylinder 23 to transfer the folding book S. First notches 61a and 61b that suppress flapping at the rear end in the direction are formed, and second notches 62a and 62b are formed on the outer peripheral surface on the other end side. Each notch 61a, 61b, 62a, 62b has a shape in which a part of the outer peripheral surface is removed to form a flat surface. And in the 1st notch part 61a, 61b located in the bag side of the folding book S in folding roller 39a, 39b, it is located in the center side rather than the outer peripheral surface of folding roller 39a, 39b, and the 1st curved part 63a curved outside. , 63b are formed, and the second notches 62a, 62b located on the peller side of the folding book S in the folding rollers 39a, 39b are curved outward from the outer peripheral surfaces of the folding rollers 39a, 39b. Second curved portions 64a and 64b are formed.

  In addition, fourth guide surfaces 65a and 65b having a uniform arc shape with the outer peripheral surfaces of the folding rollers 39a and 39b are provided in the second notches 62a and 62b located on the side of the folding book S in the folding rollers 39a and 39b. It has been. The fourth guide surfaces 65a and 65b reduce the distance from the outer peripheral surface of the folding cylinder 23, and are formed at the intermediate positions in the axial direction of the folding rollers 39a and 39b in the second notches 62a and 62b. It is provided continuously to the curved portions 64a and 64b.

By forming the folding cylinder 23 and the folding rollers 39a and 39b in this manner, the distance between the outer peripheral surfaces differs in the axial direction at a predetermined rotational phase between the folding cylinder 23 and one folding roller 39a. Yes. That is, as shown in FIG. 6, when the distance between the outer peripheral surface of the folding cylinder 23 and the outer peripheral surface of the folding roller 39a is L ₀ , the first guide surface 51 of the folding cylinder 23 is The distance L ₁ with the outer peripheral surface of the folding roller 39a is greater than the distance L _{0, and} on the bag side of the folding book S, the first guide surface 51 of the folding cylinder 23 and the first curved portion 63a of the folding roller 39a The distance L ₂ is greater than the distance L ₁ . Further, on the peller side of the folding book S, the distance L ₃ between the second guide surface 52 of the folding cylinder 23 and the second curved portion 64a of the folding roller 39a is smaller than the distance L ₁ . The distance L ₄ between the second guide surface 52 and the fourth guide surface 65a of the folding roller 39a is smaller than the distance L ₀ . In this case, distance L ₂ > distance L ₃ may be satisfied, and distance L ₁ > distance L ₃ is preferable.

  Here, the operation of the folding cylinder 23 and the folding rollers 39a and 39b in the folding machine 14 of the above-described newspaper offset rotary printing press 10 of this embodiment will be described.

  As shown in FIG. 11, when the vertically folded web W reaches the folding cylinder 23, the needle 32 of the needle device 29 pierces the tip of the web W at a predetermined position, and the folding cylinder 23 holds the web. When the folding cylinder 23 rotates and reaches a predetermined position in this state, the saw blade 34 cuts the web W laterally. At this time, the tip of the folding blade 36 that rotates in the direction opposite to the rotation direction of the folding cylinder 23 after releasing the holding of the web W by returning the needle 32 of the needle device 29 holding the tip of the web W. The portion protrudes outward from the circumferential surface of the folding cylinder 23, contacts the inner surface of the web W and protrudes outward of the folding cylinder 23.

  When the folding cylinder 23 and the folding blade 36 are further rotated, the tip of the folding blade 36 protrudes the web W further outward, and the web W protruding from the peripheral surface of the folding cylinder 23 is caused by the pair of folding rollers 39a and 39b. It is pinched. When the pair of folding rollers 39a and 39b further rotate, the web W is folded sideways to form the folded book S.

  At this time, as shown in FIG. 7-1, the folded book S that is laterally folded by the pair of folding rollers 39 a and 39 b and sandwiched in the center is released from the needle device 29 while the rear end. Is cut by the saw cylinder 24 to become a free end. However, since the space above the folding roller 39a is widened by the first guide surface 51 that is recessed with respect to the outer peripheral surface of the folding cylinder 23, air turbulence is suppressed on the bag side of the folding book S, and folding is performed. Since the rear end portion of the book S enters the first guide surface 51 and is guided, the behavior is stabilized. When the folding cylinder 23 and the folding rollers 39a and 39b further rotate, as shown in FIG. 7-2, the space above the folding roller 39a is formed by the first notch 61a located inside the outer peripheral surface of the folding roller 39a. Since the rear end portion of the signature S is guided by the first curved portion 63a, the fluttering is suppressed.

  On the other hand, as shown in FIG. 8A, the space above the folding roller 39a is widened by the second guide 52 having a uniform arc shape in the circumferential direction with respect to the outer peripheral surface of the folding cylinder 23 on the peller side of the folding book S. Accordingly, the rear end portion of the signature S is reliably guided by the second guide surface 52, so that the behavior is stabilized. When the folding cylinder 23 and the folding rollers 39a and 39b further rotate, as shown in FIG. 8-2, the folding is performed by the fourth guide 65a having a uniform arc shape in the circumferential direction with respect to the outer circumferential surface of the folding roller 39a. Since the upper space of the roller 39a is not wide, the back end portion of the folding book S is guided by the fourth guide 65a, so that flapping is suppressed.

  In this way, the webs W are gathered together at a predetermined thickness on the bag side of the folding book S until the rear end of the folding book S becomes a free end and is sandwiched between the pair of folding rollers 39a and 39b. Therefore, the distance between the folding cylinder 23 and the folding roller 39a is increased to suppress air turbulence, and the concave first guide surface 51 and the first curved portion 63a (first cutout portion 61a). By properly guiding the rear end portion of the folding book S and suppressing its fluttering stably, the folding of the folding book S is prevented. On the other hand, since the webs W are in a disjoint state on the peller side of the folding book S, the distance between the folding cylinder 23 and the folding roller 39a is reduced to increase the air flow, and the outer circumferential surface and the second uniform. By appropriately guiding the rear end portion of the folding book S by the guide surface 52 and the fourth guide surface 65a, the behavior is stabilized and fluttering is suppressed, so that the folding of the folding book S is prevented.

  As shown in FIG. 11, the folding book S properly formed by the folding rollers 39a and 39b is sequentially received by the blades 43 of the impeller 41, and delivered to the paper discharge conveyor 42 for paper discharge. Is done.

  As described above, in the web folding apparatus and the rotary printing machine according to the first embodiment, the rotary folding cylinder 23 is provided with the saw cylinder 24 for cutting the web W, and the web S is sandwiched between the folding book S. A pair of folding rollers 39a, 39b are provided, and the outer peripheral surface of the folding cylinder 23 is recessed more than the outer peripheral surface having a predetermined length along the axial direction from the bag side of the folding book S toward the peller side. While providing the 1st guide surface 51, the 2nd guide surface 52 which makes a uniform circular arc shape along the circumferential direction is provided in the 1st guide surface 51 in the axial direction on the peller side of the signature S.

  Therefore, when the web W is transferred from the folding cylinder 23 to the pair of folding rollers 39 a and 39 b to form the folded book S, the bag side at the rear end of the folded book S is folded by the first guide surface 51. Since the space above the roller 39a is wide, air turbulence is suppressed, and the rear end portion of the folding book S enters the recessed first guide surface 51 and is guided, so that the behavior is stable, On the other hand, the space above the folding roller 39a is not widened by the second guide surface 52 on the peller side at the rear end portion of the folded book S, and the rear end portion of the folded book S is surely secured by the second guide surface 52. It is guided and fluttering is prevented, and end folding of the rear end portion of the folding book S can be prevented.

  Moreover, in the web folding apparatus of Example 1, the distance between the outer peripheral surface of the folding cylinder 23 is increased on the outer peripheral surface of each pair of folding rollers 39a and 39b in the axial direction, and the folding book S is moved in the transfer direction. The first and second cutout portions 61a, 61b, 62a, and 62b that suppress the flapping of the rear end portion are provided, and the second cutout portions 62a and 62b that are located on the peller side of the folding book in the folding rollers 39a and 39b are folded. Fourth guide surfaces 65 a and 65 b that reduce the distance from the outer peripheral surface of the body 23 are provided. Accordingly, when the web W is transferred from the folding cylinder 23 to the pair of folding rollers 39a, 39b to form the folded book S, the notches 61a, 61b, 62a, 62b formed in the pair of folding rollers 39a, 39b. As a result, it is possible to suppress the fluttering of the rear end portion of the folding book S, and the fourth guide surfaces 65a, 65b can optimize the space above the folding rollers 39a, 39b. The portion is properly supported and fluttering thereof is prevented, and end folding of the rear end portion of the folded sheet S web can be reliably prevented.

  In the web folding apparatus according to the first embodiment, the groove portion 53 is formed in the folding cylinder 23 along the axial direction, and the first guide surface 51 having the first guide surface 51 is formed in the groove portion 53 from the bag side of the folded book S to the center portion. While fixing the block body 54, the 2nd block body 56 which has the 2nd guide surface 52 on the peller side of the signature S in the groove part 53 is fixed. Therefore, the first guide surface 51 and the second guide surface 52 are easily formed on the outer peripheral surface of the folding cylinder 23 by forming the groove 53 in the folding cylinder 23 and fixing the block bodies 54 and 56 to the groove 53. It is possible to improve manufacturability.

  FIG. 12 is a schematic diagram illustrating a relationship between a folding cylinder and a folding roll in the web folding apparatus according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the web folding apparatus according to the second embodiment, as shown in FIG. 12, the folding cylinder 23 is recessed from the outer peripheral surface having a predetermined length along the axial direction from the bag side of the book S to the peller side. While providing the 1st guide surface 51, the 3rd guide surface 71 which protruded rather than the outer peripheral surface to the peller side of the signature S is provided in the 1st guide surface 51 in the axial direction continuously.

  That is, in the folding cylinder 23, a first guide surface 51 and a third guide surface 71 are formed between the needle device 29 and the saw blade receiver 33 and the folding blade 36 in the circumferential direction. 51 and the third guide surface 71 are provided adjacent to the saw blade receiver 33. In this case, the first guide surface 51 has a concave shape that is recessed with respect to the outer peripheral surface of the folding cylinder 23, and the third guide surface 71 has an arc shape that protrudes from the outer peripheral surface of the folding cylinder.

  In the first guide surface 51 and the third guide surface 71, the folding cylinder 23 is formed with a groove 53 along the axial direction on the outer peripheral surface thereof. A first block body 54 formed with a first guide surface 51 corresponding to a region extending from the center to the center is fitted and fixed. Further, a second block body 72 having a third guide surface 71 formed in correspondence with the area on the peller side of the signature S is fitted and fixed to the groove 53. In this case, each block body 54 and 72 is fixed to the folding cylinder 23 in a state where the opposing end surfaces are in close contact with each other, so that the first guide surface 51 and the third guide surface 81 are in the axial direction of the folding cylinder 23. It will be formed continuously.

  By forming the folding cylinder 23 and the folding rollers 39a and 39b in this manner, the distance between the outer peripheral surfaces differs in the axial direction at a predetermined rotational phase between the folding cylinder 23 and one folding roller 39a. Yes. That is, the distance between the first guide surface 51 of the folding cylinder 23 and the first curved portion 63a of the folding roller 39a is set large on the bag side of the folding sheet S, and the folding cylinder 23 is set on the peller side of the folding sheet S. The distance between the third guide surface 71 and the fourth guide surface 65a of the folding roller 39a is set small.

  Therefore, when the web W is passed from the folding cylinder 23 to the pair of folding rollers 39a and 39b and folded to form the folded book S, the webs W are gathered together on the bag side of the folded book S. However, since the space above the folding roller 39a is widened by the first guide surface 51 that is recessed with respect to the outer peripheral surface of the folding cylinder 23, air turbulence is suppressed, and folding is performed. Since the rear end portion of the book S enters the first guide surface 51 and is guided, its behavior is stabilized and fluttering is suppressed.

  On the other hand, on the peller side in the folding book S, the webs W are in a disjoint state, but the upper space of the folding roller 39a is narrowed by the third guide 71 protruding from the outer peripheral surface of the folding cylinder 23. Since the rear end portion of the folding book S is reliably guided by the third guide surface 71, the behavior is stabilized and fluttering is suppressed.

  As described above, in the web folding apparatus and the rotary printing press according to the second embodiment, the rotary cylinder 23 is provided with the saw cylinder 24 for cutting the web W, and the web S is sandwiched between the folded sheets S. A pair of folding rollers 39a, 39b are provided, and the outer peripheral surface of the folding cylinder 23 is recessed more than the outer peripheral surface having a predetermined length along the axial direction from the bag side of the folding book S toward the peller side. While providing the 1st guide surface 51, the 3rd guide surface 71 which protruded rather than the outer peripheral surface to the peller side of the signature S is provided in the 1st guide surface 51 in the axial direction continuously.

  Therefore, when the web W is transferred from the folding cylinder 23 to the pair of folding rollers 39 a and 39 b to form the folded book S, the bag side at the rear end of the folded book S is folded by the first guide surface 51. Since the space above the roller 39a is wide, air turbulence is suppressed, and the rear end portion of the folding book S enters the recessed first guide surface 51 and is guided, so that the behavior is stable, On the other hand, since the upper space of the folding roller 39a is narrowed by the third guide surface 71 on the peller side at the rear end portion of the folded book S, the rear end portion of the folded book S is appropriately secured by the third guide surface 71. It is guided and fluttering is prevented, and end folding of the rear end portion of the folding book S can be prevented.

  In each of the above-described embodiments, the first guide surface 51 and the second guide surface 52 or the third guide surface 71 are provided in the folding cylinder 23 along the axial direction, but the first guide surface 51 and the second guide surface 71 are provided. An inclined surface may be provided between the guide surface 52 or the first guide surface 51 and the third guide surface 71 so that both are smoothly continued along the axial direction. There is no step on the outer peripheral surface along the axial direction, and the signature 23 can be stably supported.

  The web folding apparatus and the rotary printing press according to the present invention suppress end folding by stabilizing the behavior over the entire width direction of the folding book, and can be applied to any rotary printing press.

It is the schematic showing the relationship between the folding cylinder and folding roll in the web folding apparatus which concerns on Example 1 of this invention. It is a schematic perspective view of the folding cylinder in the web folding apparatus of Example 1. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing of FIG. It is a schematic perspective view of the folding roll in the web folding apparatus of Example 1. FIG. It is the schematic for demonstrating the distance of the folding cylinder and folding roll in the web folding apparatus of Example 1. FIG. It is the schematic showing the behavior of the bag bag side rear end part in the web folding apparatus of Example 1. FIG. It is the schematic showing the behavior of the bag bag side rear end part in the web folding apparatus of Example 1. FIG. It is the schematic showing the behavior of the web rear end part of the web in the web folding apparatus of Example 1. FIG. It is the schematic showing the behavior of the web rear end part of the web in the web folding apparatus of Example 1. FIG. It is the schematic showing the web offset press for newspapers to which the web folding device of Example 1 was applied. It is the schematic showing the web folding apparatus of Example 1. FIG. It is the schematic showing the principal part of the web folding apparatus of Example 1. FIG. It is the schematic showing the relationship between the folding cylinder and folding roll in the web folding apparatus which concerns on Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Paper feeder 12 Printing unit 13 Turn bar apparatus 14 Folding machine (web folding apparatus)
23 Folding cylinder 24 Saw cylinder 29 Needle device 33 Saw blade receiver 34 Saw blade 36 Folding blade 37 Folding shaft 39a, 39b Folding roller 41 Impeller 51 First guide surface 52 Second guide surface 53 Groove portion 54 First block body 56 Second Block body 61a, 61b 1st notch part 62a, 62b 2nd notch part 63a, 63b 1st bending part 64a, 64b 2nd bending part 65a, 65b 4th guide surface 71 3rd guide surface 72 3rd block body W web S Origami

Claims (7)

  A rotatable folding cylinder, a saw cylinder that cuts the web in cooperation with the folding cylinder, and a pair of folding rollers provided downstream of the folding cylinder to sandwich the web and form a folded book In the web folding apparatus, the folding cylinder is provided with a first guide surface that is recessed from an outer peripheral surface having a predetermined length along the axial direction from the bag side of the folded book toward the peller side. A web folding device.   2. The web folding device according to claim 1, wherein a second guide surface having a uniform arc shape along a circumferential direction is continuous with the first guide surface in an axial direction on a peller side of the folding book in the folding cylinder. A web folding device characterized by being provided.   The web folding device according to claim 1, wherein a third guide surface protruding from the outer peripheral surface is continuously provided in the first guide surface in the axial direction on the peller side of the folding book in the folding cylinder. A web folding device.   4. The web folding apparatus according to claim 2, wherein the first guide surface and the second guide surface, or the first guide surface and the third guide surface are smoothly continuous along an axial direction. 5. A web folding device.   5. The web folding apparatus according to claim 1, wherein a distance between the outer peripheral surface of the pair of folding rollers and an outer peripheral surface of the folding cylinder is increased on the outer peripheral surfaces of both ends in the axial direction. A fourth guide surface that is provided with a notch portion that suppresses flapping at the rear end portion in the direction and that reduces the distance from the outer peripheral surface of the folding cylinder to the notch portion located on the folding book peller side of the folding roller. A web folding device characterized in that is provided.   The web folding device according to any one of claims 2 to 5, wherein a groove portion is formed along the axial direction in the folding cylinder, and the first guide surface is formed from the bag side of the folded book to the center portion of the groove portion. The first block body is fixed, while the second block body having the second guide surface or the third block body having the third guide surface is fixed to the peg side of the signature in the groove. A web folding device.   A paper feeding device that feeds the web from the web, a printing unit that performs printing on the web fed from the paper feeding device, and a plurality of webs that have been printed by the printing unit are overlapped, cut, and folded. In a rotary printing press provided with a folding machine for forming a book, the folding machine includes a rotatable folding cylinder, a saw cylinder for cutting the web in cooperation with the folding cylinder, and a downstream side of the folding cylinder. A pair of folding rollers provided to sandwich a web to form a folding book, and an outer periphery having a predetermined length along the axial direction from the bag side of the folding book toward the peller side of the folding cylinder A rotary printing press comprising a first guide surface that is recessed from the surface.

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