JP4786596B2 - Folding roller, folding roller body and folding roller manufacturing method - Google Patents

Description

  The present invention relates to a pair of folding rollers that folds printing paper extruded by a chopper blade at a nip portion to form a folding book, a folding roller body for manufacturing the folding roller, and a method for manufacturing the folding roller. It is.

  In general, an offset rotary printing press includes a paper feeding device, an infeed device, a printing device, a drying device, a cooling device, a web pass device, a folding device, and a paper discharge device. The paper feeding device has a reel stand on which two winding bodies (web rolls) are mounted, and a web that is drawn out of one winding body and is running is used as the web of the other winding body. By connecting, it has a printing machine that can continuously supply the web. The in-feed device supplies a web drawn from a winding body of a paper feeding device to a printing device at a predetermined speed. In the printing apparatus, generally, four sets of printing units corresponding to four colors of black, cyan, red, and yellow are arranged in parallel along the web traveling direction. The drying device is for drying ink on the web printed by the printing device, and the cooling device is for cooling the web that stores excess heat after drying in the drying device to an appropriate temperature. It is. The web pass device conveys the dried and cooled web, and the folding device cuts the web after being vertically folded and folds it to a predetermined size to form a folded book. The paper device is to carry out the folded or folded book outside the apparatus.

  Therefore, a roll-shaped web is pulled out from the winding body by the paper feeding device, the web is supplied to the printing device at a predetermined speed by the infeed device, and multicolor printing is performed by each printing unit in the printing device, The printed web is dried with an ink by a drying device, cooled with a cooling device, a signature is created by a folding device conveyed through a web pass device, and is carried out by a paper discharge device.

  In such an offset rotary printing press, the folding device is provided with a chopper folding device for further folding the folded signature by cutting the web. This chopper folding device is provided in the middle of a conveyance conveyor that conveys a folded book (cut sheet) folded into four by a folding cylinder and a saddle cylinder, and the folding SG on this conveyance conveyor is parallel to the conveyance direction. Fold in a fold.

  That is, this chopper device nips a chopper table having a slit continuously on the conveyor, a chopper blade that contacts the center of the folding book abutting against the stopper and pushes it into the slit, and the folding book lowered from the slit. It is composed of a pair of folding rollers that are sandwiched and bent by pressure. Therefore, at the same time when the folded paper conveyed by the conveyor is stopped at the reference position on the chopper table, the chopper blade descends and pushes the central part of the folded paper into the slit of the chopper table, and a pair of folding rollers holds this folded paper. This folded book is chopper-folded by passing while folding.

  An example of such a chopper device is described in Patent Document 1 below.

Japanese Patent No. 2786617

  By the way, in the above-described chopper device, when the folded book is pushed into the slit of the chopper table by the descending chopper blade and passes while being folded by the folding roller, the folded chopper is smoothly transferred from the folding roller to the paper discharge device. A pair of paper guides are provided on the pair of folding rollers. That is, the folding roller is formed with a groove portion on the outer peripheral surface along the circumferential direction, and the upper end portion of the paper guide is disposed in the groove portion.

  However, the folding roller rotates and conveys the folding book downward, but the paper guide is fixed to the surrounding frame, so the paper guide and the folding book are damaged by contact. In order to prevent the occurrence of this, the paper guide is located in the groove portion, but its surface is in a position retracted from the outer peripheral surface of the folding roller. Therefore, when the folded paper is conveyed while being sandwiched between the folding rollers, it is guided by the paper guide so that the conveyance is smooth, but a part of the folded paper falls into the groove of the folding roller and curves, May come into contact with the corners of the outer peripheral surface of the folding roller and the groove, and scratches may occur here.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a folding roller, a folding roller main body, and a method for manufacturing the folding roller that improve the printing quality by suppressing the occurrence of scratches on the printing paper. .

  In order to achieve the above object, the folding roller according to the first aspect of the present invention is a pair of folding rollers that folds the printing paper extruded by the chopper blade at the nip portion to form a folded book, along the circumferential direction on the outer circumferential surface. A curved surface is provided between the outer peripheral surface and the groove portion, and the surface roughness of the curved surface is set to be smaller than the surface roughness of the outer peripheral surface. To do.

  In the folding roller according to the second aspect of the invention, the surface roughness of the predetermined length region including the curved surface from the end surface of the groove toward the outer peripheral surface is set smaller than the surface roughness of the other outer peripheral surface. It is characterized by that.

  The folding roller according to the invention of claim 3 is characterized in that a wear-resistant coating layer is provided on the outer peripheral surface and the curved surface.

  In the folding roller according to a fourth aspect of the present invention, the frictional resistance of the curved surface is set smaller than the frictional resistance of the outer peripheral surface.

  According to a fifth aspect of the present invention, the folding roller body includes a pair of folding rollers that folds the printing paper extruded by the chopper blade at the nip portion to form a folded book, and a paper guide is arranged on the outer peripheral surface along the circumferential direction. A large-diameter portion is provided between an outer peripheral surface and the groove portion, and a curved surface continuous to the groove portion is provided in the large-diameter portion.

  According to a sixth aspect of the present invention, there is provided a folding roller manufacturing method comprising: a pair of folding rollers that folds printing paper extruded by a chopper blade at a nip portion to form a folded book; A groove portion in which the paper guide is disposed is formed along with a large-diameter portion between the outer peripheral surface of the folding roller body and the groove portion, and a curved surface continuous to the groove portion is formed in the large-diameter portion. Then, an abrasion-resistant coating layer having substantially the same thickness is formed on the outer circumferential surface of the folding roller body, the outer circumferential surface of the large-diameter portion, and the curved surface, and at least the abrasion-resistant coating layer of the large-diameter portion is polished. Thus, the diameter of the outer peripheral surface of the folding roller main body and the diameter of the large diameter portion are made uniform.

  In the manufacturing method of the folding roller of the invention of claim 7, when polishing the wear-resistant coating layer of the large-diameter portion, polishing is performed so that the groove side of the coating layer of the curved surface is gradually thinned. .

  In the folding roller manufacturing method of the invention of claim 8, an abrasion-resistant coating layer having substantially the same thickness is formed on the outer circumferential surface of the folding roller body, the outer circumferential surface of the large-diameter portion, and the curved surface, and the folding roller When polishing the wear-resistant coating layer of the main body and the large diameter portion, the diameter of the outer peripheral surface of the folding roller main body and the diameter of the large diameter portion are made uniform by different polishing amounts. .

  According to the folding roller of the first aspect of the present invention, the groove portion in which the paper guide is disposed along the circumferential direction is provided on the outer peripheral surface, and the curved surface is provided between the outer peripheral surface and the groove portion. Since the thickness is set smaller than the surface roughness of the outer peripheral surface, when the folded paper is formed by sandwiching the printing paper pushed out by the chopper blade while the pair of folding rollers rotate, the printing paper has a groove portion of the folding roller. However, since the surface roughness of the curved surface is set small, the occurrence of scratches is suppressed even when the surface contacts the curved surface, and the printing quality can be improved.

  According to the folding roller of the invention of claim 2, the surface roughness of the predetermined length region including the curved surface from the end surface of the groove portion toward the outer peripheral surface is set smaller than the surface roughness of the other outer peripheral surface. Therefore, by expanding the region where the surface roughness is set small from the curved surface to the outer peripheral surface, it is possible to effectively suppress the occurrence of scratches on the printing paper due to the contact between the printing paper and the folding roller.

  According to the folding roller of the invention of claim 3, since the wear-resistant coating layer is provided on the outer peripheral surface and the curved surface, the occurrence of scratches due to surface abrasion in the folding roller is prevented, so that the printing paper and the folding roller Generation of scratches on the printing paper due to contact can be suppressed.

  According to the folding roller of the invention of claim 4, since the frictional resistance of the curved surface is set smaller than the frictional resistance of the outer peripheral surface, even if the surface of the printing paper contacts the curved surface, the frictional resistance is small, so Generation | occurrence | production will be suppressed and print quality can be improved.

  According to the folding roller body of the invention of claim 5, the groove portion in which the paper guide is disposed along the circumferential direction is provided on the outer peripheral surface, and the large-diameter portion is provided between the outer peripheral surface and the groove portion. Since a curved surface continuous to the groove portion is provided in the diameter portion, when the wear-resistant coating layer is provided on the outer peripheral surface, the surface roughness and frictional resistance between the outer peripheral surface and the large diameter portion can be easily made different.

  According to the folding roller manufacturing method of the present invention, the groove portion in which the paper guide is disposed along the circumferential direction is formed on the outer peripheral surface of the folding roller main body, and the outer peripheral surface and the groove portion of the folding roller main body. A large-diameter portion is formed in between, and a curved surface continuous to the groove portion is formed in the large-diameter portion, and the outer peripheral surface of the folding roller body, the outer peripheral surface of the large-diameter portion, and the curved surface have substantially the same thickness. By forming a coating layer and polishing the wear-resistant coating layer of at least the large diameter part, the diameter of the outer peripheral surface of the folding roller body and the diameter of the large diameter part are made uniform. A wear-resistant coating layer is formed on the outer peripheral surface and the curved surface of the portion, and at least the wear-resistant coating layer of the large-diameter portion is polished to make the surface roughness of the large-diameter portion and the curved surface smaller than the surface roughness of the outer peripheral surface Can be set, simplifying the manufacturing process and manufacturing cost It is possible to allow a reduction, it is possible to improve print quality.

  According to the manufacturing method of the folding roller of the invention of claim 7, when polishing the wear-resistant coating layer of the large diameter portion, the groove side of the curved coating layer is polished so that the groove side gradually becomes thin. By smoothing, it is possible to suppress the occurrence of scratches on the printing paper due to the contact between the printing paper and the folding roller.

  According to the folding roller manufacturing method of the present invention, the wear-resistant coating layer having substantially the same thickness is formed on the outer peripheral surface of the folding roller main body, the outer peripheral surface of the large-diameter portion, and the curved surface. When polishing the wear-resistant coating layer of the large diameter part, the diameter of the outer peripheral surface of the folding roller main body and the diameter of the large diameter part are made uniform by making the amount of polishing different, so the surface of the large diameter part and the curved surface By reducing the difference between the roughness and the surface roughness of the outer peripheral surface, it is possible to suppress the occurrence of scratches on the printing paper due to the contact between the printing paper and the folding roller.

  Exemplary embodiments of a folding roller, a folding roller main body, and a folding roller manufacturing method 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.

  FIG. 1 is an enlarged view of a main part of a folding roller according to an embodiment of the present invention, FIG. 2 is a front view of the folding roller of the present embodiment, and FIGS. 3-1 to 3-3 are folding of this embodiment. FIG. 4 is a schematic diagram illustrating a method for manufacturing a roller, FIG. 4 is a schematic diagram for explaining the surface roughness of the wear-resistant coating layer of the folding roller of this embodiment, and FIG. 5 is a folding roller of this embodiment. FIG. 6 is a schematic diagram showing a chopper folding device having a folding roller of this embodiment, and FIG. 7 is a sectional view taken along the line VII-VII in FIG. It is.

  The printing press of this embodiment is an offset rotary printing press, and as shown in FIG. 5, a paper feeding device 11, an infeed device 12, a printing device 13, a drying device 14, a cooling device 15, The web pass device 16, the folding device 17, and the paper discharge device 18 are configured.

  The paper feeding device 11 has a reel stand on which two winding bodies (web rolls) are mounted, and a web drawn out from one winding body and traveling is used as a web of the other winding body. By connecting to the web, the web can be continuously supplied. The infeed device 12 supplies the web of the paper feeding device 11 to the printing device 13 side. The printing device 13 has four printing units 21, 22, 23, and 24 for each of four ink colors Cyan, Magenta, yellow, and black along the web running direction. Are arranged side by side. The drying device 14 is for drying the ink on the web that has been printed by the printing device 13, and the cooling device 15 is a suitable temperature for the web that stores excess heat after drying in the drying device 14. It is to cool down. The web pass device 16 conveys a dried and cooled web, and the folding device 17 cuts the web after being vertically folded and folds it to a predetermined size to form a folded book. The paper discharge device 18 carries out the folded or folded book outside the apparatus.

  Accordingly, the roll-shaped web W is pulled out from the winding body by the paper feeding device 11 and is supplied to the printing device 13 by the infeed device 12, and in this printing device 13, by each printing unit 21, 22, 23, 24. The multi-color printing is performed, and the printed web W is dried by the drying device 14, cooled by the cooling device 15, and a folded book is created by the folding device 17 conveyed through the web pass device 16. It is carried out by the paper device 18.

  Further, in the folding device 17 in the offset rotary printing press of the present embodiment, as shown in FIG. 6, a former (triangular plate) 31 that vertically folds the web W is provided at the top, and below the former 31. A pair of lead-in rollers 32 and a pair of nipping rollers 33 are provided. Below the pair of nipping rollers 33, a saw cylinder 34, a folding cylinder 35, and a saddle cylinder 36 are arranged in contact with each other in this order.

  The saw body 34 is provided with a saw blade (not shown) on its peripheral surface, and can cut the vertically folded web W to a predetermined length. The folding cylinder 35 is provided with a needle device (not shown) on its peripheral surface, and this needle device operates in conjunction with the rotation of the folding cylinder 35 and cuts the needle by protruding outward at a predetermined position. While holding the leading end in the running direction of the web W, the holding of the leading end of the web W can be released by returning the needle at a predetermined position. Further, the folding cylinder 35 is provided with an insertion blade (not shown) on the peripheral surface thereof, and the cutting web W is laterally folded at the center in the conveying direction by protruding the insertion blade outward at a predetermined position. can do. The saddle drum 36 is provided with a gripping device (not shown) on its peripheral surface, and this gripping device is operated in conjunction with the rotation of the saddle drum 36 and is protruded from the peripheral surface of the folding drum 35 by the insertion blade. The center portion of the web W can be held and folded horizontally by this holding mechanism.

  Accordingly, the web W is vertically folded by the former 31 and then guided and conveyed by the lead-in roller 32 and the nipping roller 33. When the web W enters between the saw cylinder 34 and the folding cylinder 35, the web W is in a predetermined position. The needle device is actuated to project the needle outward, whereby the tip of the web W is pierced and held. When the folding cylinder 35 continues to rotate in this state, the web W moves while being held on the peripheral surface of the folding cylinder 35. Then, the web W is cut horizontally by a saw blade at a predetermined position. Subsequently, the needle device is actuated to return the needle, thereby releasing the holding of the tip of the web W, and the insertion blade projecting outward from the circumferential surface of the folding cylinder 35, so that the web W is folded. 35 is peeled off from the circumferential surface. Then, the web W protruding from the peripheral surface of the folding drum 35 is gripped by the gripping mechanism of the collar drum 36, thereby forming a signature.

  A chopper folding device 37 is provided adjacent to the rod body 36. In the chopper folding device 37, as shown in FIGS. 6 and 7, a chopper table 38 is disposed horizontally, and an upper transport conveyor 39 is disposed above the chopper table 38, while a lower transport conveyor 40 is disposed below. Is arranged. Each of the conveyors 39 and 40 includes an endless conveyor belt, a plurality of guide rollers, and a drive motor, and can convey the folded book S released by the rod cylinder 36 to a predetermined position on the chopper table 38. .

  The chopper table 38 is provided with a slit 41 at a predetermined position and a stopper 42 adjacent to the slit 41. Above the slit 41, a chopper blade 43 that comes into contact with the central portion of the signature that is in contact with the stopper 42 and is pushed into the slit 41 is provided so as to be movable up and down, and can be moved up and down by a driving device. Yes. Further, below the chopper table 38, a pair of folding rollers 44 are provided rotatably so as to bend the folding book S descending from the slit 41 by nip pressure. The folding roller 44 has a groove 45 formed on the outer peripheral surface along the circumferential direction, and the upper ends of the pair of paper guides 46 are disposed in the groove 45.

  Accordingly, the folded book S which is folded into four by the folding cylinder 35 and the rod cylinder 36 is conveyed on the chopper table 38 by the upper and lower conveying conveyors 39 and 40 and stops at a position where the tip end abuts against the stopper 42. . Then, the chopper blade 43 descends with respect to the signature S that stops at the reference position on the chopper table 38, the central portion of the signature S is pushed into the slit 41 of the chopper table 38, and the pair of folding rollers 44 By sandwiching the folded book S and passing it while folding, the folded book S is folded in eight.

  As shown in FIGS. 1 and 2, the folding roller 44 in the chopper folding device 37 configured as described above is provided with a paper folding portion 44a at a substantially intermediate portion in the axial direction, and both sides in the axial direction of the paper folding portion 44a. A support portion 44b that is rotatably supported via a bearing is provided on a frame (not shown), and a drive portion 44c to which a drive gear (not shown) is fixed is provided adjacent to one support portion 44b. As described above, two groove portions 45 in which the paper guides 46 are disposed along the circumferential direction are formed on the paper folding portion 44a of the folding roller 44 at a predetermined distance in the axial direction. Has been.

  In the folding roller 44 of the present embodiment, a curved surface 51 is provided between the outer peripheral surface of the paper folding portion 44a and the groove 45, and the surface roughness of the curved surface 51 is greater than the surface roughness of the outer peripheral surface of the paper folding portion 44a. As a result, the frictional resistance of the curved surface 51 is set smaller than the frictional resistance of the outer peripheral surface of the paper folding portion 44a.

  Specifically, the folding roller 44 is provided with a wear-resistant coating layer on the outer peripheral surface of the paper folding portion 44a and the curved surface 51, and the surface roughness of the wear-resistant coating layer is the same as that of the curved surface 51 and the paper folding. It differs from the outer peripheral surface of the part 44a.

  Here, the manufacturing method of the folding roller 44 mentioned above is demonstrated in detail.

  As shown in FIG. 3A, the folding roller main body 61 constituting the folding roller 44 has a groove 63 formed in the outer circumferential surface 62 along the circumferential direction, and a large diameter between the outer circumferential surface 62 and the groove 63. A portion 64 is provided, and a curved surface 65 that is continuous with the end surface 63a of the groove 63 is formed in the large diameter portion.

  When the folding roller main body 61 is formed in this way, as shown in FIG. 3B, the wear-resistant coating layer 66 having substantially the same thickness is formed on the outer peripheral surface 62, the outer peripheral surface of the large-diameter portion 64, and the curved surface 65. Form. In this case, for example, tungsten carbide is formed on the outer peripheral surface 62, the outer peripheral surface of the large diameter portion 64, and the curved surface 65 by thermal spraying. And as shown to FIGS. 3-3, the diameter of the outer peripheral surface 62 of the folding roller main body 61 and the diameter of the large diameter part 64 are made uniform by grind | polishing the abrasion-resistant coating layer 66 of the large diameter part 64 at least. .

  Preferably, the thickness of the wear-resistant coating layer formed on the outer peripheral surface 62 of the folding roller main body 61 and the thickness of the wear-resistant coating layer formed on the large-diameter portion 64 are substantially the same. When the abrasion-resistant coating layer 66 is polished, the outer peripheral surface 62 of the folding roller main body 61 and the outer peripheral surface of the large-diameter portion 64 are made to have different polishing amounts. That is, the polishing amount of the wear resistant coating layer 66 on the outer peripheral surface 62 of the folding roller main body 61 is reduced (thinned), and the polishing amount of the wear resistant coating layer 66 on the outer peripheral surface of the large diameter portion 64 is increased (thickened). Thus, even if the outer diameter of the outer peripheral surface 62 of the roller main body 61 and the outer diameter of the large diameter portion 63, that is, the outer diameter of the abrasion-resistant coating layer 66a after polishing is made the same, the outer peripheral surface is made uniform.

  When the abrasion-resistant coating layer 66 on the outer peripheral surface 62 of the folding roller main body 61 and the outer peripheral surface of the large-diameter portion 63 is polished, the curved surface 65 is polished so that the groove 63 side in the wear-resistant coating layer 66 becomes gradually thinner. It is preferable to do.

  Then, in the folding roller 44, the surface roughness of the predetermined length region A including the curved surface 51 from the end surface of the groove 45 toward the outer peripheral surface side of the paper folding portion 44a is the region of the other outer peripheral surface of the paper folding portion 44a. The surface roughness of B is set to be smaller.

  That is, as shown in FIG. 4, when the wear-resistant coating layer 66 having substantially the same thickness is formed on the outer peripheral surface 62 of the folding roller main body 61, the outer peripheral surface of the large-diameter portion 64, and the curved surface 65, the outer peripheral surface 62 and the outer peripheral surface 62 become large. Since the outer diameter of the outer peripheral surface of the diameter portion 64 is different, the outer diameter including the wear resistant coating layer 66 is different even if the thickness of the wear resistant coating layer 66 is the same. On the other hand, the outer peripheral surface 62 of the folding roller main body 61, the outer peripheral surface of the large-diameter portion 64, and the curved surface 65 have the same surface roughness because the thickness of the wear-resistant coating layer 66 is substantially the same. In FIG. 4, the surface roughness of the wear-resistant coating layer 66 is represented by the unevenness. When the wear-resistant coating layer 66 on the outer peripheral surface 62 of the folding roller main body 61, the outer peripheral surface of the large-diameter portion 64, and the curved surface 65 is polished to the position of the alternate long and short dash line shown in FIG. In the predetermined length region A of the large-diameter portion 64 and the curved surface 65 toward the surface 61 side, the convex portion of the wear-resistant coating layer 66 is deleted, but in the region B of the other outer peripheral surface of the paper folding portion 44a. The convex portions of the wear-resistant coating layer 66 are hardly deleted, and the surface roughness of the area A of the large-diameter portion 64 and the curved surface 65 is smaller than the surface roughness of the area B of the other outer peripheral surface of the paper folding portion 44a. Will be set. That is, as shown in FIG. 1, the surface roughness of the predetermined length region A including the curved surface 51 from the end surface of the groove 45 toward the outer peripheral surface side of the paper folding portion 44a is the other outer peripheral surface of the paper folding portion 44a. A folding roller that is set to be smaller than the surface roughness of the region B is manufactured.

  Accordingly, as shown in FIGS. 6 and 7, when the chopper blade 43 is lowered and the central portion of the signature S is pushed into the slit 41 in a state where the signature S is stopped at the reference position in contact with the stopper 42. The pair of folding rollers 44 are folded in eight by sandwiching and folding the folding book S, guided by the paper guide 46 and conveyed to the paper discharge device 18. At this time, although the signature S falls into the groove portion 45 of the folding roller 44, the surface roughness of the curved surface 51 is set to be small, so that the occurrence of scratches is suppressed even when the surface contacts the curved surface 51. As a result, the print quality can be improved.

  As described above, the folding roller according to the present embodiment is a pair of folding rollers 44 that folds the folded book S pushed out by the chopper blade 43 at the nip portion, and is along the outer circumferential surface of the paper folding portion 44a along the circumferential direction. A groove 45 in which the paper guide 46 is disposed is provided, a curved surface 51 is provided between the outer peripheral surface of the paper folding portion 44a and the groove 45, and the surface roughness of the curved surface 51 is equal to that of the outer peripheral surface of the paper folding portion 44a. It is set smaller than the surface roughness.

  Therefore, when the folding book S pushed out by the chopper blade 43 is folded by being pinched while the pair of folding rollers 44 rotate, the folding book S falls into the groove 45 of the folding roller 44, but the surface of the curved surface 51. Since the roughness is set small, the generation of scratches is suppressed even when the surface contacts the curved surface 61, and the print quality can be improved.

  Further, in the folding roller 44 of the present embodiment, the surface roughness of the predetermined predetermined area A including the curved surface 51 from the end surface of the groove 45 toward the outer peripheral surface side of the paper folding portion 44a is set to other paper folding. It is set smaller than the surface roughness of the region B on the outer peripheral surface of the portion 44a. Accordingly, by expanding the region A in which the surface roughness is set small from the curved surface 51 to the outer peripheral surface of the paper folding portion 44 a, it is possible to effectively generate the scratches on the folding S due to the contact between the folding book S and the folding roller 44. Can be suppressed.

  Further, in the folding roller 44 of the present embodiment, the wear-resistant coating layer 66a is provided on the outer peripheral surface of the paper folding portion 44a and the curved surface 51, thereby preventing scratches due to surface abrasion in the folding roller 44. Further, it is possible to suppress the occurrence of scratches on the folding S due to the contact between the folding S and the folding roller 44.

  Further, in the folding roller 44 of the present embodiment, the frictional resistance of the curved surface 51 is set smaller than the frictional resistance of the outer peripheral surface of the paper folding portion 44a. Therefore, even if the surface of the fold S is in contact with the curved surface, since the frictional resistance is small, the generation of scratches is suppressed, and the print quality can be improved.

  In the folding roller main body 61 of the present embodiment, a groove portion 63 in which the paper guide 46 is disposed along the circumferential direction is provided on the outer peripheral surface 62, and a large diameter is provided between the outer peripheral surface 62 and the groove portion 63. A portion 64 is provided, and the large diameter portion 64 is provided with a curved surface 65 continuing to the groove portion 63. Therefore, when the wear resistant coating layer 66a is provided on the outer peripheral surface 62, the surface roughness and frictional resistance of the outer peripheral surface 62 and the large diameter portion 64 can be easily made different.

  In the folding roller manufacturing method of the present embodiment, the groove portion 63 in which the paper guide 46 is disposed along the circumferential direction is formed on the outer peripheral surface 62 of the folding roller main body 61, and A large-diameter portion 64 is formed between the outer peripheral surface 62 and the groove portion 63, a curved surface 65 continuous to the groove portion 63 is formed in the large-diameter portion 64, and the outer peripheral surface 62 of the folding roller main body 61 and the outer periphery of the large-diameter portion 64 are formed. A wear-resistant coating layer 66 having substantially the same thickness is formed on the surface and the curved surface 65, and at least the wear-resistant coating layer 66 of the large-diameter portion 64 is polished, so that the diameter of the outer peripheral surface 62 of the folding roller main body 61 is increased. The diameter of the large diameter part 64 is made uniform. Accordingly, the wear-resistant coating layer 66 is formed on the outer peripheral surface 62 of the folding roller main body 61, the outer peripheral surface of the large-diameter portion 64, and the curved surface 65, and at least the abrasion-resistant coating layer 66 of the large-diameter portion 64 is polished. The surface roughness of the large-diameter portion 64 and the curved surface 65 can be set to be smaller than the surface roughness of the outer peripheral surface 62, and the manufacturing process can be simplified and the manufacturing cost can be reduced, and the printing quality can be improved. can do.

  Moreover, according to the manufacturing method of the folding roller of the present embodiment, when polishing the wear-resistant coating layer of the large-diameter portion 64, polishing is performed so that the groove portion 63 side of the coating layer of the curved surface 65 is gradually thinned, By making the curvature of the curved surface 65 smooth, it is possible to suppress the occurrence of scratches on the folding S due to the contact between the folding S and the folding roller 44.

  Further, according to the folding roller manufacturing method of the present embodiment, the wear-resistant coating layer having substantially the same thickness is formed on the outer circumferential surface 62 of the folding roller main body 61, the outer circumferential surface of the large-diameter portion 64, and the curved surface 65, When polishing the outer peripheral surface 62 of the folding roller main body 61 and the wear-resistant coating layer 66 of the large diameter portion 64, the diameter of the outer peripheral surface 62 of the folding roller main body 61 and the diameter of the large diameter portion 64 are different by different polishing amounts. Is uniform. Therefore, by reducing the difference between the surface roughness of the outer peripheral surface of the large-diameter portion 64 and the curved surface 65 and the surface roughness of the outer peripheral surface 61, the scratches on the folding S due to the contact between the folding S and the folding roller 44 are generated. Can be suppressed.

  The folding roller, the folding roller main body, and the folding roller manufacturing method according to the present invention suppress the occurrence of scratches on the printing paper by setting the surface roughness of the curved surface to be smaller than the surface roughness of the outer peripheral surface. It is intended to improve and can be applied to any printing machine.

It is a principal part enlarged view of the folding roller which concerns on one Example of this invention. It is a front view of the folding roller of a present Example. It is the schematic showing the manufacturing method of the folding roller of a present Example. It is the schematic showing the manufacturing method of the folding roller of a present Example. It is the schematic showing the manufacturing method of the folding roller of a present Example. It is the schematic for demonstrating the surface roughness of the abrasion-resistant coating layer of the folding roller of a present Example of a present Example. It is the schematic showing the offset rotary printing press to which the chopper folding apparatus which has a folding roller of a present Example was applied. It is the schematic showing the chopper folding apparatus which has a folding roller of a present Example. It is VII-VII sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Paper feeder 12 Infeed apparatus 13 Printing apparatus 14 Drying apparatus 15 Cooling apparatus 16 Web pass apparatus 17 Folding apparatus 18 Paper discharge apparatus 34 Saw cylinder 35 Folding cylinder 36 Claw cylinder 37 Chopper folding apparatus 38 Chopper table 41 Slit 43 Chopper blade 44 Folding roller 45 Groove 46 Paper guide 51 Curved surface 61 Folding roller body 62 Outer peripheral surface 63 Groove 64 Large diameter portion 65 Curved surface 66, 66a Wear-resistant coating layer W Web S Folding

Claims (8)

  In the pair of folding rollers that fold the printing paper extruded by the chopper blade at the nip portion to form a folding book, the outer circumferential surface has a groove portion in which a paper guide is disposed along the circumferential direction, and the outer circumferential surface and the groove portion. And a curved surface is provided, and the surface roughness of the curved surface is set to be smaller than the surface roughness of the outer peripheral surface.   2. The folding roller according to claim 1, wherein the surface roughness of a predetermined length region including the curved surface from the end surface of the groove toward the outer peripheral surface is set smaller than the surface roughness of the other outer peripheral surface. A folding roller characterized by that.   The folding roller according to claim 1 or 2, wherein a wear-resistant coating layer is provided on an outer peripheral surface and the curved surface.   The folding roller according to any one of claims 1 to 3, wherein a frictional resistance of the curved surface is set smaller than a frictional resistance of an outer peripheral surface.   In the pair of folding rollers that fold the printing paper extruded by the chopper blade at the nip portion to form a folding book, the outer circumferential surface has a groove portion in which a paper guide is disposed along the circumferential direction, and the outer circumferential surface and the groove portion. A folding roller main body characterized in that a large-diameter portion is provided between and a curved surface continuous to the groove portion is provided in the large-diameter portion.   In the pair of folding rollers that fold the printing paper pushed out by the chopper blade at the nip portion to form a folding book, a groove portion in which a paper guide is disposed along the circumferential direction is formed on the outer circumferential surface of the folding roller body, and A large diameter portion is formed between the outer peripheral surface of the folding roller main body and the groove portion, a curved surface continuous to the groove portion is formed in the large diameter portion, and the outer peripheral surface of the folding roller main body and the large diameter portion A wear-resistant coating layer having substantially the same thickness is formed on the outer peripheral surface and the curved surface, and at least the wear-resistant coating layer of the large-diameter portion is polished, so that the diameter of the outer peripheral surface of the folding roller body and the large A method for manufacturing a folding roller, characterized in that the diameter of the diameter portion is uniform.   In the manufacturing method of the folding roller of Claim 6, when grind | polishing the abrasion-resistant coating layer of the said large diameter part, it grind | polishes so that the said groove part side of the coating layer of the said curved surface may become thin gradually. A manufacturing method of a folding roller.   The manufacturing method of a folding roller according to claim 6 or 7, wherein an abrasion-resistant coating layer having substantially the same thickness is formed on the outer circumferential surface of the folding roller body, the outer circumferential surface of the large-diameter portion, and the curved surface, When polishing the folding roller main body and the wear resistant coating layer of the large diameter portion, the diameter of the outer peripheral surface of the folding roller main body and the diameter of the large diameter portion are made uniform by different polishing amounts. A manufacturing method of a folding roller.

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