JP2009233981A - Printing machine and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prolong a service life by suppressing deformation of rubber rollers and improving durability in a printing machine and its control method. <P>SOLUTION: On an ink supply route for feeding ink from ink jars 22, 42 as the supply source to plate cylinders 35, 55, and on a dampening water supply route for feeding dampening water from spray dampeners 81, 91 as the supply source to the plate cylinders 35, 55, there are installed: nip pressure automatic regulators 37, 38, 57, 58, 82, 92 that freely rotatably support rubber rollers and metallic rollers in an abutting state and that are capable of varying the abutting state of the rubber rollers and the metallic rollers; and a controller 61 that controls the nip pressure automatic regulators 37, 38, 57, 58, 82, 92 to separate the rubber rollers and the metallic rollers during the non-printing time. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a printing machine in which a part of rollers can change a contact state with an adjacent roller, and a control method of the printing machine.

  For example, a web offset press for newspapers is composed of a plurality of paper feeding devices, a plurality of printing units, a turn bar device, and a folding machine, and when a web is supplied from each paper feeding device to the printing unit. After each web is printed, the turn route device changes the travel route of the plurality of webs, and after the webs are overlapped in a predetermined order, the webs are vertically folded by a folding machine to a predetermined length. Then, the sheet is cut horizontally and folded to form a signature, and the sheet is discharged.

  A printing unit in such a web offset press for newspaper includes a large number of rollers for supplying ink to the plate cylinder in addition to a blanket cylinder and a plate cylinder on both the left and right sides of the vertically conveyed web. Each roller group is arranged. That is, an ink fountain, an ink fountain roller, a delivery roller, a kneading roller, a reciprocating roller, and an ink application roller are arranged in series in contact with each other. A group of rollers for supplying the fountain solution is also arranged, and the fountain solution supply device, the reciprocating roller, the kneading roller, and the swimsuit roller are arranged in series in contact with each other. A plate is mounted on the surface of the plate cylinder, and an ink application roller and a swim roller are in contact with the plate cylinder, and the plate cylinder is in contact with the blanket cylinder.

  Therefore, when the ink fountain roller is rotated, the ink whose supply amount is adjusted by the ink fountain roller is supplied from the ink fountain to the delivery roller, kneaded by the kneading roller, spread in the axial direction by the reciprocating roller, and then the ink is applied. Passed to Laura. At the same time, the dampening water whose supply amount is adjusted by the dampening water supply device is spread in the axial direction by the reciprocating roller, kneaded by the kneading roller, and then delivered to the swimsuit roller. Then, the ink and dampening water formed on the thin film from the ink application roller and the swim roller are supplied to the plate surface of the plate cylinder, the ink adhering to the plate surface is transferred to the blanket cylinder, and the web between the opposite blanket cylinder is transferred to the web. Is sandwiched, a predetermined printing pressure is applied to the web, and the ink of each blanket cylinder is transferred to both sides of the web as a pattern.

  As described above, the ink is transferred from the ink fountain to the ink fountain roller, delivery roller, kneading roller, reciprocating roller, ink application roller, plate cylinder, and blanket cylinder, and transferred from the blanket cylinder to the web. At the same time, the dampening water is transferred from the dampening water supply device to the reciprocating roller, the kneading roller, the swimsuit roller, the plate cylinder, and the blanket cylinder. In this case, when the ink or the fountain solution is transferred between the rollers, it is generally preferable that about half of the ink or the fountain solution formed on the surface of the roller is transferred to the contacting roller. For this reason, it is necessary to appropriately adjust the nip pressure between the rollers in contact with each other. That is, in order to improve the quality of printing by adjusting the supply amount of ink and dampening water, it is necessary to optimize the nip pressure between adjacent rollers. An adjustment mechanism is provided.

  As a conventional nip pressure adjusting mechanism, there is one described in Patent Document 1 below. The nip pressure adjusting mechanism described in Patent Document 1 expands or contracts the pressure hose by supplying and discharging air, thereby moving the roller in the radial direction via the roller support, and the nip between the roller and the contacting roller. The pressure is adjusted.

Japanese Patent No. 3853739

  As described above, in the conventional nip pressure adjusting mechanism, the rubber roller (kneading roller, ink application roller, swimsuit roller) is replaced with the metal roller (delivery roller, reciprocating roller, Press the cylinder). For this reason, the rubber roller is pressed against the metal roller even when each roller is not rotating, such as after printing is finished or when the plate is replaced. In this case, since a part of the rubber roller is pressed against the metal roller, the rubber roller is left for a predetermined time with the pressed portion deformed. Then, the rubber roller is likely to deteriorate, and when each roller rotates when printing is started again, the rubber roller cannot be properly pressed against the metal roller, and there is a possibility that an appropriate nip pressure cannot be secured.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object thereof is to provide a printing machine and a control method thereof that can extend the life by suppressing deformation of a rubber roller and improving durability.

  In order to achieve the above object, a printing press according to claim 1 is a printing press in which a rubber roller and a metal roller are rotatably supported in a contact state, and the contact state between the rubber roller and the metal roller is changed. It is possible to provide a possible roller moving means and a control means for separating the rubber roller and the metal roller by the roller moving means during non-printing.

  According to a second aspect of the present invention, the control means separates the rubber roller and the metal roller by the roller moving means after completion of printing.

  According to a third aspect of the present invention, the control means separates the rubber roller and the metal roller by the roller moving means when not in use.

  According to a fourth aspect of the present invention, the roller moving means is a nip pressure automatic adjusting device that automatically adjusts the nip pressure between the rollers in contact with each other.

  In the printing machine of the invention of claim 5, an ink supply device for supplying ink, a delivery roller for delivering ink supplied by the ink supply device, a kneading roller for kneading ink delivered from the delivery roller, A reciprocating roller that spreads the ink kneaded by the kneading roller in the width direction, an ink forming roller that supplies ink transferred from the ink of the reciprocating roller, and a plate on which the ink of the ink forming roller is transferred to the image line portion A cylinder and a blanket cylinder for transferring the ink transferred to the plate cylinder to the sheet, and are rotatably supported in series with each other, and the kneading roller and the ink application roller are configured as the rubber roller, The delivery roller, the reciprocating roller, and the plate cylinder are configured as the metal roller, and the control unit is configured to move the kneading roller and the roller by the roller moving unit during non-printing. It is characterized in that disengaging from the roller adjacent the Nki form roller.

  According to a sixth aspect of the present invention, there is provided a printing press control method in which a rubber roller and a metal roller are rotatably supported in contact with each other on an ink supply path for supplying ink from its supply source to a plate cylinder. The rubber roller and the metal roller are separated from each other during non-printing.

  The control method of the printing machine according to claim 7 is characterized in that the rubber roller is moved away from the metal roller during non-printing.

  According to the first aspect of the printing machine, the rubber roller and the metal roller are rotatably supported in the contact state, the roller moving means capable of changing the contact state between the rubber roller and the metal roller, and the roller movement when not printing. Control means for separating the rubber roller and the metal roller by the means is provided. Accordingly, when printing is not performed, the rubber roller and the metal roller are separated from each other, and the local deformation of the rubber roller is eliminated, and the life can be extended by suppressing the deformation of the rubber roller and improving the durability. can do.

  According to the printing machine of the second aspect of the present invention, since the control means separates the rubber roller and the metal roller by the roller moving means after completion of printing, the rubber roller and the metal roller can be separated at an optimal timing.

  According to the printing machine of the invention of claim 3, since the control means separates the rubber roller and the metal roller by the roller moving means when not in use, the rubber roller and the metal in the unused unit among the plurality of printing units. By separating the roller, early deterioration of the rubber roller that is not necessary for printing can be suppressed.

  According to the printing machine of the fourth aspect of the present invention, since the automatic nip pressure adjusting device for automatically adjusting the nip pressure between the contacting rollers is provided as the roller moving means, the roller is detached using the automatic nip pressure adjusting device. Thus, there is no need to provide a separate roller moving means, and the increase in size and cost of the apparatus can be suppressed.

  According to the printing machine of the fifth aspect of the present invention, the ink supply device, the delivery roller, the kneading roller, the reciprocating roller, the ink application roller, the plate cylinder, and the blanket cylinder are in series contact with each other and rotatably supported. While the application roller is configured as a rubber roller, the delivery roller, the reciprocating roller, and the plate cylinder are configured as a metal roller, and the control unit separates the kneading roller and the ink application roller from the adjacent rollers by the roller moving unit during non-printing. When printing is not being performed, the kneading roller and the ink application roller are separated from other rollers, and local deformation of the kneading roller and the ink application roller can be prevented.

  Further, according to the control method of the printing machine of the invention of claim 6, the rubber roller and the metal roller are rotatably supported in contact with each other on the ink supply path for supplying ink from the supply source to the plate cylinder. The rubber roller and the metal roller are separated from each other during printing. Accordingly, when printing is not performed, the rubber roller and the metal roller are separated from each other, and the local deformation of the rubber roller is eliminated, and the life can be extended by suppressing the deformation of the rubber roller and improving the durability. can do.

  According to the control method of the printing press of the seventh aspect, since the rubber roller is moved away from the metal roller during non-printing, the support structure of the metal roller can be simplified by moving only the rubber roller.

  Exemplary embodiments of a printing press and a control method thereof 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 a schematic configuration diagram of a printing unit in a newspaper offset rotary printing press according to an embodiment of the present invention, FIG. 2 is a sectional view of a nip pressure automatic adjusting device, and FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a schematic diagram showing the contact state between the kneading roller and the reciprocating roller during printing, FIG. 5 is a schematic diagram showing the separated state between the kneading roller and the reciprocating roller during non-printing, and FIG. It is the schematic showing the web offset press for newspapers of a present Example.

  In the present embodiment, as shown in FIG. 6, the newspaper offset rotary printing press applied as an offset rotary printing press includes a paper feeding device 11, a printing device 12, a turn bar device 13, and a folding machine 14. Has been. The paper feeding device 11 is provided with a plurality of holding arms 15 for holding three webs R each of which a web (sheet) W is wound in a roll shape, and by rotating each holding arm 15, The web R can be rotated to the paper feed position. Further, the 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. The web R in the standby position can be spliced.

  Further, the printing apparatus 12 is provided with a multicolor printing unit 16 that performs double-sided four-color printing, and a two-color printing unit 17 that performs double-sided two-color printing. The multi-color printing unit 16 and the two-color printing unit 17 can perform predetermined printing on the web W supplied from the paper feeding device 11. In the present embodiment, the printing apparatus 12 includes 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 multi-color printing unit that performs 4-color or 2-color printing on one side.

  Further, the turn bar device 13 is provided with a plurality of turn bars (not shown), and the travel route of each web W sent from each printing unit 16, 17 can be changed and superposed in a predetermined order. The folding machine 14 vertically folds the web W conveyed from the turn bar device 13, cuts the web W by a predetermined length, further folds it horizontally to form a desired fold, and then discharges the paper.

  Therefore, first, when the web W is supplied from the paper feeding device 11 to the multicolor printing unit 16 or the two-color printing unit 17 constituting the printing device 12, the printing units 16 and 17 each print four colors on the web W. And two-color printing. Next, the plurality 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. The plurality of webs W overlapped are conveyed to the folding machine 14, where they are vertically folded, then laterally cut, and further folded laterally to form a desired crease, which is then placed on the paper discharge conveyor by the impeller. The paper is ejected.

  Here, the printing units 16 and 17 in the printing apparatus 12 described above will be described. Since the roller arrangements of the printing units 16 and 17 are substantially the same, only the multicolor printing unit and 16 will be described in detail. The printing unit 16 can perform four-color printing, and the roller arrangement of each color is substantially the same. Therefore, only one roller arrangement will be described in detail.

  In the printing unit 16, as shown in FIG. 1, rollers are arranged symmetrically with respect to the conveyance path of the web W along the vertical direction, and the left side performs surface printing with respect to the conveyance path of the web W. The front surface printing unit 21 performs printing, and the right side is a back surface printing unit 41 that performs back surface printing.

  The front surface printing unit 21 includes an ink fountain (ink supply device) 22, an ink source roller 23, a delivery roller 24, three kneading rollers 25, 26, 27, three reciprocating rollers 28, 29, 30, 3 The two ink forming rollers 31, 32, 33, the plate cylinder 35, and the blanket cylinder 36 are configured so as to be rotatably supported in contact with each other in series. Further, the front surface printing unit 21 is provided with a dampening water supply device that supplies dampening water. That is, a swimsuit roller 34 is rotatably supported by contacting the plate cylinder 35, and a reciprocating roller 30 is rotatably supported by contacting the swimsuit roller 34. A gate 81 is provided. The spray dampener 81 is configured by arranging a plurality of spray nozzles along the axial direction of the reciprocating roller 30, and sprays dampening water into a fan shape and applies it to the reciprocating roller 30.

  That is, the ink fountain 22 stores ink of a predetermined viscosity set in advance, and an ink base roller 23 is provided adjacent to the ink fountain 22. The ink fountain roller 23 kneads ink metered by an ink key (not shown) of the ink fountain 22, has a surface formed of metal, and is rotatably supported by a frame (not shown). The ink base roller 23 can be driven to rotate in the direction of the arrow by a driving device (not shown).

  The delivery roller 24 delivers ink from the ink source roller 23, has a surface formed of metal or resin, and is rotatably supported by the frame so as to contact the ink source roller 23. The kneading roller 25 kneads the ink delivered from the delivery roller 24, has a surface formed of rubber, and is rotatably supported by the frame so as to contact the delivery roller 24. The reciprocating roller 28 spreads the ink kneaded by the kneading roller 25 in the width direction, has a surface formed of metal, is rotatably supported by the frame so as to contact the kneading roller 25, and is axially Can be moved back and forth. The other kneading roller 26 kneads ink transferred between adjacent rollers, and the kneading roller 27 kneads dampening water transferred between adjacent rollers, and has a rubber surface. And is rotatably supported by the frame so as to be in contact with adjacent rollers. The other reciprocating roller 29 expands the ink transferred between adjacent rollers in the width direction, and the reciprocating roller 30 expands the ink transferred between adjacent rollers in the width direction. Is made of metal, is rotatably supported by the frame so as to be in contact with adjacent rollers, and is reciprocally movable in the axial direction.

  The ink application rollers 31, 32, 33 and the swim application roller 34 receive and supply ink spread by the reciprocating rollers 28, 29 or dampening water expanded by the reciprocating roller 30, and have a rubber surface. And is rotatably supported by the frame so as to be in contact with the reciprocating rollers 28, 29, and 30. The delivery roller 24, the kneading rollers 25, 26, and 27, the reciprocating rollers 28, 29, and 30, the ink deposition rollers 31, 32, and 33, and the swimsuit roller 34 are coupled and driven in synchronization by a gear (not shown). The device can be driven to rotate in the direction of the arrow.

  The plate cylinder 35 is a metal roller around which a printing plate (not shown) is wound, and the ink application rollers 31, 32, 33 and the ink of the swimsuit roller 34 are transferred to the image line portion of the printing plate, The ink adhering rollers 31, 32, 33 and the swimsuit roller 34 are rotatably supported by the frame so as to be in contact with each other. The blanket cylinder 36 is a rubber roller around which a blanket (rubber) (not shown) is wound. The blanket cylinder 36 transfers ink transferred from the plate cylinder 35 to the web W, and is attached to the frame so as to come into contact with the plate cylinder 35. It is supported rotatably. The plate cylinder 35 and the blanket cylinder 36 are coupled so as to be synchronously driven by a gear (not shown), and can be driven to rotate in the direction of the arrow by a driving device.

  In this case, the printing plate mounted on the plate cylinder 35 is formed with an area with a pattern (image area) and an area without an image (non-image area), and the image area is oleophilic and non-image area. The part is hydrophilic. Therefore, when ink is supplied from the ink application rollers 31, 32, 33 to the printing plate mounted on the plate cylinder 35 and dampening water is supplied from the swim roller 34, the ink is applied only to the image line portion. Is transferred, and dampening water is transferred to the non-image area. When the blanket cylinder 36 comes into contact with the plate cylinder 35 and rotates synchronously, the ink in the image line portion is transferred from the plate cylinder 35 to the blanket cylinder 36.

  On the other hand, the back surface printing unit 41 has the same configuration, and an ink fountain (ink supply device) 42, an ink source roller 43, a delivery roller 44, three kneading rollers 45, 46 and 47, and three reciprocations. The rollers 48, 49, and 50, the three ink deposition rollers 51, 52, and 53, the plate cylinder 55, and the blanket cylinder 56 are configured so as to be rotatably supported in contact with each other in series. Further, the front surface printing unit 41 is provided with a dampening water supply device that supplies dampening water. That is, a swimsuit roller 54 is rotatably supported in contact with the plate cylinder 55, and a reciprocating roller 50 is rotatably supported in contact with the swimsuit roller 54. A gate 91 is provided. The spray dampener 91 is configured by arranging a plurality of spray nozzles along the axial direction of the reciprocating roller 50, and sprays dampening water into a fan shape and applies it to the reciprocating roller 50.

  That is, the ink fountain 42 stores ink of a predetermined viscosity set in advance, and an ink base roller 43 is provided adjacent to the ink fountain 42. The ink fountain roller 43 kneads ink metered by an ink key (not shown) of the ink fountain 42, has a surface formed of metal, and is rotatably supported by a frame (not shown). The ink base roller 43 can be driven to rotate in the direction of the arrow by a driving device (not shown).

  The delivery roller 44 delivers ink from the ink source roller 43, has a surface formed of metal or resin, and is rotatably supported by the frame so as to contact the ink source roller 43. The kneading roller 45 kneads the ink delivered from the delivery roller 44, has a surface formed of rubber, and is rotatably supported by the frame so as to contact the delivery roller 44. The reciprocating roller 48 spreads the ink kneaded by the kneading roller 45 in the width direction, has a surface formed of metal, is rotatably supported by the frame so as to be in contact with the kneading roller 45, and is axially Can be moved back and forth. The other kneading roller 46 kneads ink passed between adjacent rollers, and the kneading roller 47 kneads dampening water passed between adjacent rollers, and the surface is formed of rubber. And is rotatably supported by the frame so as to be in contact with adjacent rollers. The other reciprocating roller 49 expands the ink transferred between adjacent rollers in the width direction, and the reciprocating roller 50 expands the ink transferred between adjacent rollers in the width direction. Is made of metal, is rotatably supported by the frame so as to be in contact with adjacent rollers, and is reciprocally movable in the axial direction.

  The ink applying rollers 51, 52 and 53 and the swim roller 54 receive and supply ink spread by the reciprocating rollers 48 and 49 or dampening water spread by the reciprocating roller 50, and have a rubber surface. And is rotatably supported by the frame so as to be in contact with the reciprocating rollers 48, 49, and 50. The delivery roller 44, the kneading rollers 45, 46, 47, the reciprocating rollers 48, 49, 50, the ink application rollers 51, 52, 53, and the swimsuit roller 54 are connected and driven in synchronization by a gear (not shown). The device can be driven to rotate in the direction of the arrow.

  The plate cylinder 55 is a metal roller on which a printing plate (not shown) is wound on the surface, and the ink application rollers 51, 52, 53 and the ink of the bathing roller 54 are transferred to the image line portion of the printing plate, It is rotatably supported by the frame so as to be in contact with the ink deposition rollers 51, 52, 53 and the swimsuit roller 54. The blanket cylinder 56 is a rubber roller around which a blanket (rubber) (not shown) is wound. The blanket cylinder 56 transfers ink transferred from the plate cylinder 55 to the web W, and is attached to the frame so as to come into contact with the plate cylinder 55. It is supported rotatably. The plate cylinder 55 and the blanket cylinder 56 are coupled so as to be synchronously driven by a gear (not shown), and can be driven to rotate in the direction of the arrow by a driving device.

  Accordingly, the ink metered by the ink source roller 23 in the surface printing unit 21 is supplied from the ink fountain 22 to the delivery roller 24 through the ink source roller 23. The ink supplied to the delivery roller 24 is delivered to the reciprocating roller 28 through the kneading roller 25, and the reciprocating roller 28 is reciprocated in the axial direction to be spread in the width direction. Further, the ink spread in the width direction by the reciprocating roller 28 is transferred to the reciprocating roller 29 through the kneading roller 26, and the reciprocating roller 29 is reciprocated in the axial direction to be further expanded in the width direction.

  The ink spread in the width direction by the reciprocating rollers 28 and 29 is supplied to the ink forming rollers 31, 32, and 33, and the ink forming rollers 31, 32, and 33 are rotated. , 32, 33 are transferred to the plate surface of the plate cylinder 35. At this time, the ink on the ink application rollers 31, 32, 33 is applied only to the image line portion of the printing plate mounted on the plate cylinder 35. Transcribed. On the other hand, the spray dampener 81 applies dampening water atomized in a fan shape to the reciprocating roller 30, and is transferred to only the non-image portion of the printing plate mounted on the plate cylinder 35 through the swimsuit roller 34. Then, when the plate cylinder 35 rotates, the ink in the image line portion of the printing plate is transferred to the blanket cylinder 36.

  On the other hand, the ink metered by the ink source roller 43 in the back surface printing unit 41 is supplied from the ink fountain 42 to the delivery roller 44 through the ink source roller 43. The ink supplied to the delivery roller 44 is delivered to the reciprocating roller 48 through the kneading roller 45, and the reciprocating roller 48 is reciprocated in the axial direction to be spread in the width direction. Further, the ink spread in the width direction by the reciprocating roller 48 is transferred to the reciprocating roller 49 through the kneading roller 46, and the reciprocating roller 49 reciprocates in the axial direction to further spread in the width direction.

  The ink spread in the width direction by the reciprocating rollers 48 and 49 is supplied to the ink forming rollers 51, 52 and 53, and the ink forming rollers 51, 52 and 53 are rotated to rotate the ink forming rollers 51. , 52, 53 are transferred to the plate surface of the plate cylinder 55. At this time, the ink on the ink application rollers 51, 52, 53 is applied only to the image line portion of the printing plate mounted on the plate cylinder 55. Transcribed. On the other hand, the spray dampener 91 applies dampening water atomized in a fan shape to the reciprocating roller 50, and is transferred to only the non-image area of the printing plate mounted on the plate cylinder 55 through the swimsuit roller 54. Then, when the plate cylinder 55 rotates, the ink in the image line portion of the printing plate is transferred to the blanket cylinder 56.

  Thereafter, when the web W passes between the blanket cylinders 36 and 56, the ink (picture) transferred to the blanket cylinders 36 and 56 by the printing pressure is transferred to the front and back of the web W. That is, the ink on the blanket cylinder 36 is transferred to the front surface of the web W, and the ink on the blanket cylinder 56 is transferred to the back surface of the web W, whereby double-sided printing on the web W is performed.

  Thereafter, when the web W passes between the blanket cylinders 36 and 56, the ink (picture) transferred to the blanket cylinders 36 and 56 by the printing pressure is transferred to the front and back of the web W. That is, the ink on the blanket cylinder 36 is transferred to the front surface of the web W, and the ink on the blanket cylinder 56 is transferred to the back surface of the web W, whereby double-sided printing on the web W is performed.

  In the printing unit 16 configured as described above, in this embodiment, in the front surface printing unit 21, the kneading rollers 25, 26, and 27, the ink applying rollers 31, 32, and 33, the swimsuit roller 34, and the adjacent rollers. As the roller moving means capable of changing the contact state with the nip pressure automatic adjusting device 37, 38, 82 is provided. Further, in the back surface printing unit 41, as a roller moving means capable of changing the contact state between the kneading rollers 45, 46, 47 and the ink applying rollers 51, 52, 53, the swimsuit roller 54, and each adjacent roller, a nip Automatic pressure adjusting devices 57, 58 and 92 are provided. Then, at the end of printing, the nip pressure automatic adjusting devices 37, 38, 57, 58, 82, 92 cause the kneading rollers 25, 26, 27, 45, 46, 47 and the ink application rollers 31, 32, 33, 51, 52, 53. And a control device 61 for moving the swimsuit rollers 34 and 54 and separating them from the adjacent rollers.

  In other words, the nip pressure automatic adjusting devices 37, 38, 57, 58, 82, 92 include the kneading rollers 25, 26, 27, 45, 46, 47 and the ink applying rollers 31, 32, 33, 51, 52, 53 and the swimsuits. The nip pressure between the rollers 34 and 54 and the respective rollers in contact with the rollers 34 and 54 is automatically adjusted.

  In this case, in FIG. 1, the front surface printing unit 21 has one nip pressure automatic adjusting device 37 for the three kneading rollers 25, 26, and 27, and one for the three ink forming rollers 31, 32, and 33. Although only one nip pressure automatic adjustment device 82 is shown for the nip pressure automatic adjustment device 38 and the swimsuit roller 34, all the kneading rollers 25, 26, 27, the ink application rollers 31, 32, 33, and the swimsuit roller A separate automatic nip pressure adjusting device is provided for 34. Similarly, in the back surface printing unit 41, one nip pressure automatic adjusting device 57 for the three kneading rollers 45, 46, 47, and one nip pressure for the three ink forming rollers 51, 52, 53. Although only one nip pressure automatic adjustment device 92 is shown for the automatic adjustment device 58 and the swimsuit roller 34, all the kneading rollers 45, 46, 47, the ink application rollers 51, 52, 53, and the swimsuit roller 54 are shown. On the other hand, a separate automatic nip pressure adjusting device is provided. Further, the control device 61 can drive and control all the automatic nip pressure adjusting devices 37, 38, 57, 58, 82 and 83.

  Here, the nip pressure automatic adjusting devices 37, 38, 57, 58, 82, and 92 will be described. The nip pressure automatic adjusting devices 37, 38, 57, 58, 82, and 92 have substantially the same configuration. Therefore, only the nip pressure automatic adjusting device 37 will be described. Further, the nip pressure automatic adjusting device 37 is provided at both axial end portions of the kneading roller 26 in the axial direction, and both have the same configuration, so only one of them will be described.

  In the nip pressure automatic adjusting device 37, as shown in FIGS. 2 and 3, a case 72 having a cylindrical shape is fixed to the frame 71. The case 72 has an outer cylinder 72a and an inner cylinder 72b. . Like the case 72, the support 73 has a cylindrical shape and is loosely fitted between the outer cylinder 72a and the inner cylinder 72b of the case 72. The end of the kneading roller 26 is connected to the support 73.

  The case 72 has a ring-shaped friction plate 74 fixed to the outer peripheral surface of the inner cylinder 72b, while the support 73 has a ring-shaped friction plate 75 fixed to the inner peripheral surface thereof. The plates 74 and 75 are arranged alternately. Further, the case 72 has a driving rod 76 that is supported inside the inner cylinder 72b so as to be movable in the axial direction, and a pressing portion 76a that presses and contacts the friction plates 74 and 75 is formed at one end. Yes. The drive rod 76 has a support plate 76b at the other end, and a compression spring 77 is interposed between the inner cylinder 72b of the case 72 and the support plate 76b.

  A pressure chamber 78 for pressing the support plate 76 b of the drive rod 76 is formed between the frame 71 and the case 72, and an air supply hole 71 a communicating with the pressure chamber 78 is formed in the frame 71. The air supply hole 71a is connected to an air supply device (not shown).

  Furthermore, in the space between the outer cylinder 72a of the case 72 and the support body 73, tubes 79 divided into four in the circumferential direction are interposed, and air is supplied to and discharged from each tube 79 individually. be able to.

  Therefore, in a state where air is not supplied to the pressure chamber 78, the drive rod 76 is urged and supported to the left in FIG. 2 by the urging force of the compression spring 77, and the pressing portion 76a is supported by the friction plates 74 and 75. By pressing and contacting, the support 73, that is, the kneading roller 26 can be fixed at this position with respect to the case 72 by the frictional force. On the other hand, when air is supplied to the pressure chamber 78 from the air supply hole 71a, the support plate 76b receives pressure and moves to the right in FIG. 2 against the urging force of the compression spring 77. Then, the pressing portion 76a releases the pressing of the friction plates 74 and 75 and separates them, so that the support 73, that is, the kneading roller 26 becomes free from the case 72. Here, by supplying and discharging air to / from one of the four tubes 79, each tube 79 expands and contracts to move the support 73, that is, the kneading roller 26, and the nip pressure with the adjacent roller is increased. Can be adjusted.

  In the printing unit 16 of this embodiment, the ink source rollers 23 and 43, the delivery rollers 24 and 44, the kneading rollers 25, 26, 27, 45, 46, 47, the reciprocating rollers 28, 29, 30, 48, 49, 50, ink deposition rollers 31, 32, 33, 51, 52, 53, swimsuit rollers 34, 54, plate cylinders 35, 55, and blanket cylinders 36, 56 are substantially rotatably supported in series, and are kneaded. The rollers 25, 26, 27, 45, 46, 47, the ink deposition rollers 31, 32, 33, 51, 52, 53 and the swim rollers 34, 54 are configured as rubber rollers, while the delivery rollers 24, 44 and the reciprocating rollers 28 are configured. , 29, 30, 48, 49, 50 and plate cylinders 36, 56 are configured as metal rollers.

  That is, a rubber roller and a metal roller are rotatably supported in contact with each other on an ink supply path for supplying ink from ink fountains 22 and 42 as supply sources to blanket cylinders 36 and 56 through plate cylinders 35 and 55. Has been. The rubber roller and the metal roller are in contact with each other on the dampening water supply path for supplying the dampening water from the spray dampeners 81 and 91 serving as the supply source to the blanket cylinders 36 and 56 through the plate cylinders 35 and 55. It is supported so that it can rotate freely. With this configuration, the control device 61 causes the rubber roller and the metal roller to be separated by the automatic nip pressure adjusting devices 37, 38, 57, 58, 82, and 92 during non-printing. Specifically, after the printing is completed, the control device 61 applies the kneading rollers 25, 26, 27 to the printing units that are not used by the automatic nip pressure adjusting devices 37, 38, 57, 58, 82, 92. , 45, 46, 47, the ink application rollers 31, 32, 33, 51, 52, 53 and the swimsuit rollers 34, 54 are separated from the adjacent rollers.

  Here, the kneading rollers 25, 26, 27, 45, 46, 47 using the nip pressure automatic adjusting devices 37, 38, 57, 58, 82, 92 by the control device 61 and the ink forming rollers 31, 32, 33, 51 are used. , 52, 53, and the separation control of the swimsuit rollers 34, 54 will be specifically described. Here, the case where the kneading roller 26 is separated from the reciprocating roller 29 by the automatic nip pressure adjusting device 37 will be described as described above.

  As shown in FIG. 4, the control device 61 makes the kneading roller 26 and the reciprocating roller 29 contact each other by bringing the kneading roller 26 into contact with the adjacent reciprocating roller 29 with a predetermined pressure by the automatic nip pressure adjusting device 37 in advance. The nip pressure between them is adjusted to the optimum value. Therefore, when the printing operation by the printing unit 16 is executed, an appropriate amount of ink supplied to the kneading roller 26 is transferred from the kneading roller 26 to the reciprocating roller 29. When the printing operation by the printing unit 16 is finished, the rotation of the kneading roller 26 and the reciprocating roller 29 is stopped, so that a part of the outer peripheral portion of the kneading roller 26 is pressed by the reciprocating roller 29, thereby forming a recess 26a. It will be.

  Therefore, in this embodiment, as shown in FIG. 5, the control device 61 reduces the printing speed when the printing operation by the printing unit 16 is completed. 26 is separated from the adjacent reciprocating roller 29, and a predetermined gap S is secured between the kneading roller 26 and the reciprocating roller 26.

  That is, as shown in FIG. 1, in the surface printing unit 21, the kneading roller 25 is separated from the delivery roller 24 and the reciprocating roller 28 by the automatic nip pressure adjusting device 37, and the kneading roller 26 is separated from the reciprocating rollers 28 and 29. The kneading roller 27 is separated from the reciprocating roller 30. Further, by the automatic nip pressure adjusting device 38, the ink forming roller 31 is separated from the reciprocating roller 28 and the plate cylinder 35, the ink forming roller 32 is separated from the reciprocating roller 29 and the plate cylinder 35, and the ink forming roller 33 is reciprocated. And separated from the plate cylinder 35. Further, the swimsuit roller 34 is separated from the reciprocating roller 30 and the plate cylinder 35 by the automatic nip pressure adjusting device 82.

  In the back surface printing unit 41, the kneading roller 45 is separated from the delivery roller 44 and the reciprocating roller 48 by the automatic nip pressure adjusting device 57, the kneading roller 46 is separated from the reciprocating rollers 48 and 49, and the kneading roller 47 is reciprocated. Separated from the roller 50. Further, by the automatic nip pressure adjusting device 58, the ink forming roller 51 is separated from the reciprocating roller 48 and the plate cylinder 55, the ink forming roller 52 is separated from the reciprocating roller 49 and the plate cylinder 55, and the ink forming roller 53 is reciprocated. And separated from the plate cylinder 55. Further, the swimsuit roller 54 is separated from the reciprocating roller 50 and the plate cylinder 55 by the automatic nip pressure adjusting device 92.

  Therefore, in each printing unit 21, 41, the kneading rollers 25, 26, 27, 45, 46, 47, the ink applying rollers 31, 32, 33, 51, 52, 53, and the swimsuit rollers 34, 54 are rotated. When it is damaged, it is detached from each adjacent roller. Therefore, the outer peripheral surfaces of the kneading rollers 25, 26, 27, 45, 46, 47 as the rubber rollers, the ink applying rollers 31, 32, 33, 51, 52, 53 and the swimsuit rollers 34, 54 are pressed from the metal rollers. It does not dent locally under pressure, and its deterioration is suppressed.

  Thus, in the newspaper offset rotary printing press and its control method according to the present embodiment, the ink is supplied on the ink supply path from the ink fountains 22 and 42 as the supply source to the plate cylinders 35 and 55, and is dampened. A rubber roller and a metal roller are rotatably supported in contact with each other in a dampening water supply path for supplying water from a spray dampener 81, 91 as a supply source to the plate cylinders 35, 55. Nip pressure automatic adjustment device 37, 38, 57, 58, 82, 92 capable of changing the contact state of the roller, and rubber roller and metal roller by the nip pressure automatic adjustment device 37, 38, 57, 58, 82, 92 when not printing And a control device 61 for separating the two.

  Accordingly, when printing is not performed, the rubber roller and the metal roller are separated from each other, and the local deformation of the rubber roller is eliminated, and the life can be extended by suppressing the deformation of the rubber roller and improving the durability. can do.

  In this case, in this embodiment, the ink base rollers 23, 43, the delivery rollers 24, 44, the kneading rollers 25, 26, 27, 45, 46, 47, the reciprocating rollers 28, 29, 30, 48, 49, 50, the ink The landing rollers 31, 32, 33, 51, 52, 53, the swim rollers 34, 54, the plate cylinders 35, 55, and the blanket cylinders 36, 56 are substantially supported in series and rotatably supported. 26, 27, 45, 46, 47, the ink deposition rollers 31, 32, 33, 51, 52, 53 and the swim roller 34, 54 are configured as rubber rollers, while the delivery rollers 24, 44 and the reciprocating rollers 28, 29, 30 are configured. , 48, 49, 50 and plate cylinders 36, 56 are configured as metal rollers. Then, the control device 61 uses the nip pressure automatic adjustment devices 37, 38, 57, 58, 82, and 92, and the kneading rollers 25, 26, 27, 45, 46, and 47 and the ink application rollers 31, 32, and 33 during non-printing. , 51, 52, 53 and the swimsuit rollers 34, 54 are separated from the adjacent rollers.

  Therefore, when printing is not being performed, the kneading rollers 25, 26, 27, 45, 46, 47, the ink applying rollers 31, 32, 33, 51, 52, 53 and the bathing rollers 34, 54 are connected to other rollers. The kneading rollers 25, 26, 27, 45, 46, 47, the ink applying rollers 31, 32, 33, 51, 52, 53 and the swimsuit rollers 34, 54 can be prevented from being locally deformed. it can.

  Further, in the newspaper offset rotary printing press of this embodiment, the control device 61 uses the nip pressure automatic adjusting devices 37, 38, 57, 58, 82, and 92 after the printing to complete the kneading rollers 25, 26, 27, 45, and 92. 46, 47, the ink deposition rollers 31, 32, 33, 51, 52, 53 and the swim roller 34, 54 are separated from the adjacent rollers. Therefore, the rubber roller and the metal roller can be separated at the optimum timing by releasing the contact between the rollers after the printing is completed.

  Further, in the newspaper offset rotary printing press of this embodiment, the control device 61 uses the nip pressure automatic adjusting devices 37, 38, 57, 58, 82, 92 when the printing unit is not used, and the kneading rollers 25, 26, 27. , 45, 46, 47 and the ink deposition rollers 31, 32, 33, 51, 52, 53 and the swimsuit rollers 34, 54 are separated from the adjacent rollers. That is, when the printing unit is a printing unit capable of printing four colors, when performing one color printing, the remaining three color printing units are not used. Therefore, at this time, the rubber roller and the metal roller are separated from each other in the printing unit that is not in use, so that early deterioration of the rubber roller that is not necessary for printing can be suppressed.

  Further, in the newspaper offset rotary printing press of this embodiment, automatic nip pressure adjusting devices 37, 38, 57, 58, 82, and 92 for automatically adjusting the nip pressure between the contacting rollers are applied as roller moving means. Yes. Therefore, the nip pressure automatic adjusting devices 37, 38, 57, 58, 82, and 92 are used to remove the rollers, and it is not necessary to provide a separate roller moving means, thereby suppressing the increase in size and cost of the device. be able to.

  Also, in the newspaper offset rotary press of this embodiment, the rubber roller is moved away from the metal roller during non-printing, and the metal roller support structure is simplified by moving only the rubber roller. can do. The metal roller may be movable.

  As a method for supplying ink, a gap transfer method (continuous ink supply method) in which a predetermined gap is provided between the ink source roller and the delivery roller to deliver ink from the ink source roller to the recess of the delivery roller and supply it. And a call transfer method (intermittent ink supply method) in which a call roller that reciprocates between the ink source roller and the reciprocating roller is provided to deliver ink from the ink source roller to the reciprocating roller via the call roller. There is. In this embodiment, the gap transfer method (continuous ink supply method) is used, but the call transfer method (intermittent ink supply method) may be used. That is, in the above-described embodiment, the ink supply device is configured by the ink fountains 22 and 42 and the ink source rollers 23 and 43. However, the present invention is not limited to this configuration, and the ink source is replaced with the delivery rollers 24 and 44. Calling rollers that reciprocate between the rollers 23 and 43 and the kneading rollers 25 and 45 may be used. Further, it may be a jet type ink supply pump.

  In the above-described embodiment, the nip pressure automatic adjusting devices 37, 38, 57, 58, 82, and 92 are configured by supplying and discharging air to and from the plurality of tubes 79, and the fixing device is configured to include a plurality of friction plates. 74, 75, but is not limited to this configuration.

  In the above-described embodiments, the printing press and the control method of the present invention are applied to a newspaper offset rotary printing press. However, the printing press and the control method thereof may be applied to other printing presses such as a commercial printing press. Also, a sheet-fed printing machine may be used, and a double-sided printing machine is used, but a single-sided printing machine may be used.

  In the above-described embodiment, the description has been made by applying the printing unit 16 having the dampening device including the spray dampeners 81 and 82, the reciprocating rollers 30 and 50, the kneading rollers 27 and 47, and the swimsuit rollers 34 and 54. However, the present invention is not limited to this configuration, and may be applied to a printing unit that does not have a dampening device such as waterless printing. Furthermore, the newspaper rotary offset printing press has been described as an example. However, any printing press having a configuration in which a rubber roller and a metal roller are rotatably supported in a contact state may be used. For example, a sheet-fed press that prints sheet-like paper. It may be.

  The printing press and the control method thereof according to the present invention can extend the life by suppressing the deformation of the rubber roller and improving the durability by separating the rubber roller and the metal roller during non-printing. It can be applied to any printing machine.

1 is a schematic configuration diagram of a printing unit in a newspaper offset rotary printing press according to an embodiment of the present invention. It is sectional drawing of a nip pressure automatic adjustment apparatus. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is the schematic showing the contact state of the kneading roller and reciprocating roller at the time of printing. It is the schematic showing the separation state of the kneading roller and reciprocating roller at the time of non-printing. It is the schematic showing the web offset press for newspapers of a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Paper feeder 12 Printing apparatus 13 Turn bar apparatus 14 Folding machine 21 Surface printing unit 22, 42 Ink fountain (ink supply apparatus)
23, 43 Ink base roller 24, 44 Delivery roller (metal roller)
25, 26, 27, 45, 46, 47 Kneading rollers (rubber rollers)
28, 29, 30, 48, 49, 50 Reciprocating roller (metal roller)
31, 32, 33, 51, 52, 53 Inking roller (rubber roller)
34,54 Swimsuit roller (rubber roller)
35,55 plate cylinder (metal roller)
36, 56 Blanket cylinder 37, 38, 57, 58, 82, 92 Automatic nip pressure adjusting device (roller moving means)
41 Back side printing unit 61 Control device (control means)
81,82 spray dampener W web

Claims (7)

In a printing machine in which a rubber roller and a metal roller are rotatably supported in a contact state,
Roller moving means capable of changing a contact state between the rubber roller and the metal roller;
Control means for separating the rubber roller and the metal roller by the roller moving means during non-printing;
A printing machine.   The printing machine according to claim 1, wherein the control unit separates the rubber roller and the metal roller by the roller moving unit after completion of printing.   2. The printing press according to claim 1, wherein the control unit separates the rubber roller and the metal roller by the roller moving unit when not in use.   4. The printing press according to claim 1, wherein the roller moving unit is a nip pressure automatic adjustment device that automatically adjusts a nip pressure between rollers in contact with each other. 5. An ink supply device for supplying ink;
A delivery roller for delivering ink supplied by the ink supply device;
A kneading roller for kneading the ink delivered from the delivery roller;
A reciprocating roller for spreading the ink kneaded by the kneading roller in the width direction;
An ink application roller for supplying ink transferred from the ink of the reciprocating roller;
A plate cylinder on which the ink of the ink applying roller is transferred to the image line portion;
A blanket cylinder for transferring the ink transferred to the plate cylinder to the sheet;
Is supported in series and rotatably.
While configuring the kneading roller and the ink application roller as the rubber roller,
The delivery roller, the reciprocating roller, and the plate cylinder are configured as the metal roller,
5. The printing machine according to claim 1, wherein the control unit causes the roller moving unit to separate the kneading roller and the ink application roller from the adjacent rollers during non-printing. In a printing machine in which a rubber roller and a metal roller are rotatably supported in contact with each other on an ink supply path for supplying ink from its supply source to a plate cylinder,
Separating the rubber roller and the metal roller during non-printing;
A control method for a printing press.   The control method for a printing press according to claim 6, wherein the rubber roller is moved away from the metal roller during non-printing.

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