JP2005254649A - Offset printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multicolor printing machine, in which the quality of a printing plate can be kept at least a certain level by a method wherein a certain dampening water is fed at all times to the printing plate. <P>SOLUTION: A driving transmitting means is equipped with a driving gear 81 arranged at the side of a first plate cylinder, a transfer gear 82, a transfer gear 83, an intermediate gear 84, a driving gear 85 and a driving gear 86, which is arranged at the side of a form dampening roller 77 so as to engage with the driving gear 85 in order to turn the form dampening roller 77. The driving gear 86 has the number of teeth, which is larger in number than that originally necessary for turning the form dampening roller 77 and a first plate cylinder 11 at one and the same peripheral speed. As a result, under the state that the form dampening roller 77 is arranged at a position further separated from the printing plate P, the form dampening roller 77 turns at a peripheral speed slower than that of the first plate cylinder 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides a plurality of ink supply devices for supplying inks of different colors to a plurality of image areas in a printing plate held on a plate cylinder, and a dampening solution individually for each of the plurality of image areas. The present invention relates to a multi-color printing apparatus including the plurality of ink supply apparatuses and the same number of dampening water supply apparatuses.

  A plate cylinder having a plurality of printing plates mounted on the outer periphery thereof, and a plurality of ink supply devices for supplying inks of different colors to image areas in the plurality of printing plates held on the plate cylinder, Multi-color printing apparatuses that perform printing with a plurality of colors of ink using a single plate cylinder or impression cylinder are known.

  For example, Patent Document 1 discloses a plate cylinder having two printing plates mounted on the outer periphery thereof, and two ink supply devices for supplying different colors of ink to the printing plates on the plate cylinder. , Having a single dampening water supply device for supplying dampening water to each printing plate on the plate cylinder, and an impression cylinder having a half the diameter of the plate cylinder, the impression cylinder rotating twice A multicolor printing apparatus is described in which printing paper is supplied each time printing is performed, and printing is performed on the printing paper with two colors of ink.

  In the multicolor printing apparatus described in Patent Document 1, dampening water is supplied to a printing plate to be printed with different color inks by a single dampening water supply apparatus. However, in the case where such a configuration is adopted, the color of the color to be originally supplied to each image area of the printing plate is caused by, for example, ink emulsifying and adhering to a roller such as a wet roller in the dampening water supply device. There arises a problem that ink of a color different from the ink adheres and the printed matter is stained.

Therefore, in Patent Document 2, in order to solve the problem in Patent Document 1, the same number of dampening water supply devices as the plurality of ink supply devices are provided to supply dampening water to each of the plurality of image regions. ing. Each fountain solution supply device includes a swim roller that can swing between a position that contacts the surface of the printing plate to supply the fountain solution to the image area and a position that is separated from the surface of the printing plate. Is arranged. For this reason, in the apparatus described in Patent Document 2, it is possible to prevent the occurrence of dirt on the printed matter. Such a swim roller is used to supply a constant amount of dampening water to the printing plate with a constant thickness of dampening water on the surface of the swim roller, or between the swim roller and the printing plate. In order not to damage the printing plate due to slipping, it is necessary to rotate at the same peripheral speed as the peripheral speed of the plate cylinder.
JP-A-3-143634 JP-A-11-99617

  In order to keep the circumferential speed of the swim roller and the circumferential speed of the plate cylinder the same, in general, a gear disposed on the side of the swim roller and a gear disposed on the side of the plate cylinder The structure which connects these directly or via an intermediate gear is employ | adopted. However, when such a configuration is employed, the peripheral speed of the swim roller may slightly change with respect to the peripheral speed of the plate cylinder due to the gear processing accuracy and the like. In such a case, the amount of dampening water supplied to the printing plate changes, and printing unevenness called “gear eyes” occurs.

  In addition, a plurality of ink supply devices for supplying inks of different colors to a plurality of image areas on the printing plate held on the plate cylinder, and dampening water is individually supplied to each of the plurality of image areas. In a multi-color printing apparatus including a plurality of ink supply apparatuses and the same number of dampening water supply apparatuses, it is necessary to bring the swimsuit roller into contact with only a necessary image area. It is necessary to reciprocate between the supply position of the dampening water that can come into contact with the water and the retracted position. In such a printing apparatus, there is a problem that gear eyes are likely to occur when the swim roller contacts the printing plate.

  The present invention has been made in order to solve such problems, and by constantly supplying a constant dampening solution to the printing plate, the quality of the printing plate can be maintained at a certain level or higher. An object is to provide a color printing apparatus.

  The invention according to claim 1 is a plurality of ink supply devices for supplying inks of different colors to a plurality of image regions in a printing plate mounted on an outer peripheral portion of a plate cylinder, and the plurality of image regions. In the multicolor printing apparatus comprising the same number of dampening water supply devices and the same number of dampening water supply devices for supplying dampening water to each of the plurality of ink supply devices, the dampening water supply device corresponds to the printing plate. A swim roller that is movable between a contact position and a position separated from the printing plate, and transmitting the drive of the plate cylinder to the swim roller, thereby separating the swim roller from the printing plate. In this position, a drive transmission means for rotating at a peripheral speed slower than the peripheral speed of the plate cylinder is disposed, and the drive transmission means freely moves the swim roller in a direction opposite to the rotation direction of the plate cylinder. While making it rotatable Characterized in that it comprises a clutch.

  The invention according to claim 2 is the multicolor printing apparatus according to claim 1, wherein a speed difference between a circumferential speed of the swim roller at a position separated from the printing plate and a circumferential speed of the plate cylinder is: It is 3% or less of the peripheral speed of the plate cylinder.

  According to a third aspect of the present invention, in the multicolor printing apparatus according to the first or second aspect, the drive transmission means includes a gear disposed on a side of the plate cylinder, and the swim roller. A one-way clutch comprising: a gear disposed on a side; an intermediate gear coupling a gear disposed on a side of the plate cylinder and a gear disposed on a side of the swim roller; Is disposed between a gear disposed on a side of the swim roller and the swim roller.

  According to a fourth aspect of the present invention, in the multi-color printing apparatus according to the first or second aspect, the drive transmission means includes a gear disposed on a side of the plate cylinder, and the swim roller. A gear disposed on a side, an intermediate gear coupling a gear disposed on a side of the plate cylinder and a gear disposed on a side of the swim roller, and the swim roller The gear disposed on the side of the roller has a larger number of teeth than the gear for rotating the swim roller and the plate cylinder at the same peripheral speed.

  A fifth aspect of the present invention is the multicolor printing apparatus according to any one of the first to fourth aspects, further comprising a rider roller for leveling the dampening water transferred onto the swim roller. The landing roller and the rider roller rotate at the same peripheral speed via a drive transmission means different from the drive transmission means.

  According to the first aspect of the present invention, the drive transmission means is arranged to rotate the swim roller at a peripheral speed slower than the peripheral speed of the plate cylinder at a position separated from the printing plate. Since the one-way clutch that allows the swim roller to freely rotate in the direction opposite to the rotation direction of the plate cylinder is provided, even if the swim roller is at a position separated from the printing plate, a constant humidity is maintained on the swim roller. When the swim roller contacts the printing plate, the swim roller rotates at the same peripheral speed as the peripheral speed of the plate cylinder by the frictional force between the swim roller and the printing plate. Will do. Thereby, a constant dampening water can be always supplied to the printing plate, and the quality of the printing plate can be maintained above a certain level.

  According to the second aspect of the present invention, the difference between the circumferential speed of the swim roller and the circumferential speed of the plate cylinder at a position separated from the printing plate is 3% or less of the circumferential speed of the plate cylinder. Further, the dampening water transferred onto the swim roller can be held almost constant regardless of the position of the swim roller. Thereby, a constant dampening water can always be supplied to the printing plate.

  According to the third aspect of the present invention, the drive transmission means is arranged on the side of the plate cylinder, on the side of the plate cylinder, on the side of the swim roller, and on the side of the plate cylinder. An intermediate gear that connects the installed gear and the gear disposed on the side of the swim roller, and the one-way clutch is formed by the gear disposed on the side of the swim roller and the swim roller. Since it is disposed between them, the peripheral speed of the intermediate gear or the like is not changed even when the swim roller contacts the printing plate. For this reason, when the swim roller contacts the printing plate, the inertial force due to the intermediate gear or the like can be eliminated, and the influence of the inertial force on the rotational speed of the plate cylinder can be minimized.

  According to the fourth aspect of the present invention, the gear disposed on the side of the swim roller has more teeth than the gear for rotating the swim roller and the plate cylinder at the same peripheral speed. Therefore, it is possible to set the swim roller at a necessary peripheral speed when the swim roller is separated from the printing plate while having a simple configuration.

  According to the invention described in claim 5, since the rider roller is further provided, the dampening water can be made more uniform.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view of a multicolor printing apparatus according to the present invention.

  In this multicolor printing apparatus, an image is recorded on a printing plate on which two images respectively held on the first and second plate cylinders 11 and 12 are not recorded, and then supplied to the printing plate. The ink is transferred onto the printing paper held by the impression cylinder 15 via the first and second blanket cylinders 13 and 14 for printing.

  The multicolor printing apparatus includes a first plate cylinder 11, a second plate cylinder 12, a first blanket cylinder 13 provided so as to be in contact with the first plate cylinder 11, and a second plate cylinder. 12, a second blanket cylinder 14 provided so as to be able to contact the first blanket cylinder 12, a first pressure cylinder 15 provided so as to be able to contact the first blanket cylinder 13, and a second blanket cylinder 14. The second impression cylinder 16 provided so as to be able to contact, the feed cylinder 17 for passing the printing paper supplied from the paper feeding unit 31 to the impression cylinder 15, and the printed matter received from the first impression cylinder 15 A transfer cylinder 18 for transferring to the second impression cylinder and a paper discharge cylinder 19 disposed adjacent to the second impression cylinder 16 are provided.

  The impression cylinder 15 provided so as to be in contact with the first blanket cylinder 13 has a diameter that is ½ of the diameter of the first plate cylinder 11 and the first blanket cylinder 13. The impression cylinder 16 provided so as to be in contact with the second blanket cylinder 14 has a diameter that is ½ of the diameter of the second plate cylinder 12 and the second blanket cylinder 14. The first and second impression cylinders 15 and 16 have grippers (not shown) for holding and conveying the leading edge of the printing paper.

  The paper feed cylinder 17 disposed adjacent to the first impression cylinder 15 has the same diameter as the first impression cylinder 15. The paper feed cylinder 17 holds and conveys the leading end of the printing paper supplied one by one from the paper feed unit 31 with a gripper (not shown). The leading end of the printing paper held by the gripper is held by the gripper of the first pressure drum 15 when the printing paper is transferred from the paper feeding drum 17 to the first pressure drum 15.

  A transfer cylinder 18 disposed between the first impression cylinder 15 and the second impression cylinder 16 includes first and second plate cylinders 11 and 12 and first and second blanket cylinders 13 and 14. It has the same diameter as the diameter. This transfer cylinder 18 holds and conveys the leading end of the printed matter received from the first 15 by a gripper (not shown), and delivers the leading end of the printed matter to the gripper of the second impression cylinder 16.

  A paper discharge cylinder 19 disposed adjacent to the second impression cylinder 16 has the same diameter as that of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14. . The discharge drum 19 has a structure in which a pair of chains 23 are wound around both ends thereof, and a gripper is disposed on a connecting member (not shown) that connects the pair of chains 23. The leading end portion of the printing paper held by the gripper of the second impression cylinder 16 is held by any of the grippers of the discharge cylinder 19 when the printed material is transferred from the second impression cylinder 16 to the discharge cylinder 19. . The printed material is discharged onto the paper discharge unit 32 as the chain 23 moves.

  The first and second impression cylinders 15 and 16, the paper feed cylinder 17, the paper discharge cylinder 19, and the first and second blanket cylinders 13 and 14 are connected to each other by gears attached to the ends thereof. Further, the first blanket cylinder 13 and the first plate cylinder 11, and the second blanket cylinder 14 and the second plate cylinder 12 are respectively connected by gears attached to the end portions thereof. Accordingly, by driving the drive motor, the paper feed cylinder 17, the impression cylinder 15, the paper discharge cylinder 17, the first and second blanket cylinders 13 and 14, and the first and second plate cylinders 11 and 12 are mutually connected. Rotate synchronously.

  Around the first plate cylinder 11, an ink supply device 20a for supplying, for example, black (K) ink to one printing plate mounted on the outer periphery of the first plate cylinder 11, and Ink is supplied to the other printing plate mounted on the outer peripheral portion of one plate cylinder 11 by, for example, an ink supply device 20b for supplying magenta (M) ink and an ink supply device 20a in the printing plate. A dampening water supply device 21a for supplying dampening water to the region and a dampening water supply device 21b for supplying dampening water to the region where ink is supplied by the ink supply device 20b in the printing plate are arranged. Has been. Further, around the second plate cylinder 12, an ink supply device 20c for supplying, for example, cyan (C) ink to one printing plate mounted on the outer peripheral portion of the second plate cylinder 12; Ink is supplied to one printing plate mounted on the outer peripheral portion of the second plate cylinder 12 by, for example, an ink supply device 20d for supplying yellow (Y) ink and an ink supply device 20c in the printing plate. A dampening water supply device 21c for supplying dampening water to the area to be applied, and a dampening water supply device 21d for supplying dampening water to the area where ink is supplied by the ink supply device 20d in the printing plate; Is arranged.

  Further, around the first plate cylinder 11 or the second plate cylinder 12, a plate feeding section 33 for supplying a printing plate to the outer peripheral portion of the first plate cylinder 11, and a second plate cylinder, respectively. A plate supplying unit 34 for supplying a printing plate to the outer peripheral portion of the image forming apparatus 12, an image recording device 35 for recording an image on the printing plate mounted on the outer peripheral portion of the first plate cylinder 11, and a second plate. An image recording device 36 for recording an image on a printing plate mounted on the outer peripheral portion of the cylinder 12 is disposed.

  FIG. 2 is a schematic side view of an ink supply unit in the ink supply devices 20a, 20b, 20c, and 20d described above (collectively referred to as “ink supply device 20”), and FIG. 3 is a plan view thereof. . In addition, in FIG. 3, illustration of the ink 50 is abbreviate | omitted.

  The ink supply unit has an ink source roller 51 whose axial direction is oriented in the width direction of the printed material (a direction orthogonal to the printing direction by the printing machine), and L pieces of divided inks with respect to the width direction of the printed material. Ink keys 54 (1), 54 (2),... 54 (L) arranged in L rows corresponding to the region, each of which is configured to be able to adjust the opening degree with respect to the outer peripheral surface of the ink source roller 51. (Referred to collectively as “ink key 54”), an ink supply roller 52 for supplying ink to the printing plate on the first plate cylinder 11 or the second plate cylinder 12, the ink source roller 51 and the ink. A swing roller 53 is disposed between the ink supply roller 52 and the ink key 54. The swing roller 53 is disposed between the ink supply roller 52 and the ink key 54. Possible configurations and You have me.

  On the back side of each ink key 54, L eccentric cams for respectively pressing the ink key 54 toward the surface of the ink source roller 51 in order to change the opening degree of each ink key 54 with respect to the ink source roller 51. 55 is disposed. Each of these eccentric cams 55 is connected via an axis 56 to L pulse motors 57 for rotationally driving the eccentric cam 55. When an ink key drive pulse is applied to the pulse motor 57, the eccentric cam 55 rotates around the shaft 56 by the drive of the pulse motor 57, and the pressing force to each ink key 54 is changed. The opening degree of the ink key 54 with respect to the ink source roller 51 is changed, and the amount of ink supplied to the ink source roller 51 is changed.

  As shown in FIG. 1, the ink supply roller 52 is configured to supply ink to an ink form roller 58 described later via a plurality of ink rollers. The inking roller 58 is a roller that supplies ink to the printing plate by contacting the first plate cylinder 11 or the second plate cylinder 12.

  FIG. 4 is a schematic diagram illustrating a dampening water supply unit in dampening water supply devices 21a, 21b, 21c, and 21d (referred to collectively as “dampening water supply device 21”).

  These dampening water supply devices 21 supply dampening water to the printing plate P before the ink is supplied to the printing plate P by the ink supply device 20, and a storage tank 74 for storing dampening water; A water source roller 75 disposed so as to be partially immersed in the storage tank 74, a swim roller 77 rotating in contact with the printing plate on the first plate cylinder 11 or the second plate cylinder 12, A transfer roller 76 disposed between the water roller 75 and the water roller 77 and abutting against both rollers, and a rider roller 78 abutting against the water roller 77 are provided.

  The storage tank 74 stores dampening water circulated by a circulation means (not shown), and keeps the dampening water level constant by, for example, an overflow mechanism (not shown). A temperature adjusting mechanism (not shown) that keeps the temperature of the circulating dampening water constant is also provided.

  The water source roller 75 is a rubber roller capable of holding dampening water on its surface, and is dampened from the storage tank 74 to its surface by being rotated counterclockwise in FIG. Pump up. The rotational speed of the water source roller 75 can be changed by a control means (not shown) according to the amount of dampening water supplied.

  The swim roller 77 is in contact with the first plate cylinder 11 or the second plate cylinder 12 by a cam mechanism (not shown) while maintaining contact with the transfer roller 76, as shown by a solid line in FIG. And a separation roller indicated by a two-dot chain line are configured to be movable, and rotate in the same circumferential direction as the first plate cylinder 11 or the second plate cylinder 12. (To rotate in the same circumferential direction is the relationship indicated by reference signs A and B in FIG. 4. This is because the rotation direction A of the plate cylinder 11 and the rotation direction B of the swim roller 77 are in a reverse rotation relationship. This watering roller 77 receives the dampening water pumped up by the water source roller 75 via the transfer roller 76 and supplies it to a predetermined printing plate.

  The swim roller 77 is centered on the rotation shaft 92 (see FIG. 5) of the transfer roller 76, and as shown by the phantom line in FIG. Is movable between a position in contact with the printing plate P and a position separated from the printing plate P.

  The transfer roller 76 is a metal roller whose surface is subjected to a hydrophilic treatment, and transmits dampening water from the water source roller 75 to the swim roller 77. The transfer roller 76 is configured to swing in the axial direction of the first plate cylinder 11 or the second plate cylinder 12 by swing means (not shown).

  The rider roller 78 is a metal roller for receiving and pushing the dampening water transferred onto the swim roller 77. The rider roller 78 is also configured to swing with respect to the axial direction of the first plate cylinder 11 or the second plate cylinder 12 by swing means (not shown).

  Referring to FIG. 1 again, around the first plate cylinder 11 or the second plate cylinder 12, a plate supply unit 33 for supplying the printing plate P to the outer peripheral portion of the first plate cylinder 11, respectively. A plate supply unit 34 for supplying the printing plate to the outer peripheral portion of the second plate cylinder, and an image recording device 35 for recording an image on the printing plate mounted on the outer peripheral portion of the first plate cylinder 11. An image recording device 36 for recording an image on a printing plate mounted on the outer peripheral portion of the second plate cylinder 12, and a common plate discharging portion for the first plate cylinder 11 and the second plate cylinder 12. Has been placed.

  In the printing apparatus having such a configuration, the printing plate drawn from the supply cassette 41 in the plate supply unit 33 is cut into a predetermined size by the cutter 42. Then, the leading end portion of the cut sheet-like printing plate is guided by the guide roller and the guide member, and is held by the holding claw of the first plate cylinder 11. Then, the first plate cylinder 11 rotates and the printing plate is wound around the outer periphery of the first plate cylinder 11, and the rear end portion of the printing plate is held by the other holding claw. In this state, while rotating the first plate cylinder 11 at a low speed, the image recording device 35 irradiates the surface of the printing plate held on the outer periphery of the first plate cylinder 11 with a modulated laser beam, Record.

  Similarly, the printing plate drawn out from the supply cassette 43 in the plate supply unit 34 is cut into a predetermined size by the cutter 44. Then, the leading end of the cut sheet-like printing plate is guided by a guide roller and a guide member, and is held by a holding claw of the second plate cylinder 12. Then, the second plate cylinder 12 rotates and the printing plate is wound around the outer periphery of the second plate cylinder 12, and the rear end portion of the printing plate is held by the other holding nail. In this state, while rotating the second plate cylinder 12 at a low speed, the laser beam modulated by the image recording device 26 onto the printing effective area of the surface of the printing plate held on the outer periphery of the second plate cylinder 12 is applied. Irradiate and record image.

  When the plate making process is completed, a printing process is performed in which printing is performed on printing paper using the printing plates on the first and second plate cylinders 11 and 12. This printing process is performed as follows.

  That is, first, each fountain solution supply device 21 and each ink supply device 20 are brought into contact only with the corresponding printing plates among the printing plates held on the first and second plate cylinders 11 and 12. Accordingly, the dampening water and the ink are supplied to each printing plate from the corresponding dampening water supply device 21 and the corresponding ink supply device 20. The ink supplied to the printing plate is transferred to corresponding areas of the first and second blanket cylinders 13 and 14.

  Then, the printing paper is supplied to the paper feed cylinder 16. This printing paper is transferred from the paper feed cylinder 16 to the impression cylinder 15. When the impression cylinder 15 continues to rotate in this state, the impression cylinder 15 has a diameter that is ½ of the first and second plate cylinders 11 and 12 and the first and second blanket cylinders 13 and 14. Therefore, black and cyan inks are transferred to the printing paper held on the outer periphery of the impression cylinder 15 in the first rotation, and magenta and yellow inks are transferred in the second rotation.

  In this way, the leading end portion of the printing paper on which printing of four colors has been completed is transferred from the impression cylinder 15 to the discharge cylinder 17. Then, the printing paper on which the printing of the four colors has been completed is conveyed toward the paper discharge unit 32 and is discharged by driving the pair of chains 19.

  When the printing process is completed, the printing plate used for printing is discharged to the discharging section. Then, the first and second blanket cylinders 13 and 14 are cleaned by a blanket cylinder cleaning device (not shown), and the printing process is completed.

  FIG. 5 is an explanatory view showing the relationship between the first plate cylinder 11 and the transfer roller 76, the swim roller 77, and the rider roller 78 in an expanded manner.

  The swim roller 77 is rotatably disposed in contact with the transfer roller 76 and the rider roller 78. The drive of the first plate cylinder 11 is transmitted to the swim roller 77 by the drive transmission means. The swim roller 77 rotates at a peripheral speed slightly slower than the peripheral speed of the first plate cylinder 11 by this drive transmission means.

  This drive transmission means has a drive gear 81 disposed on the side of the first plate cylinder 11, a transmission gear 82 that meshes with the drive gear 81 and rotates, and a shaft 91 that is common to the transmission gear 82. A transmission gear 83 that rotates as the transmission gear 82 is driven, an intermediate gear 84 that rotates in mesh with the transmission gear 83, and a drive gear that is disposed on the side of the transfer roller 76 that rotates in mesh with the intermediate gear 84. 85 and a drive gear 86 disposed on the side of the swim roller 77 that rotates in mesh with the drive gear 85.

  The drive gear 86 has a number of teeth m2 that is larger than the number of teeth m1 of the gear originally required for rotating the swim roller 77 and the first plate cylinder 11 at the same peripheral speed. It should be noted that the number of teeth m2 of the drive gear 86 that is actually used, and the number of teeth m1 of the drive gear 86 that is originally required to rotate the swim roller 77 and the first plate cylinder 11 at the same peripheral speed, Is less than 3 percent of the number of teeth m1 of the drive gear 86 that is originally required. That is, when the diameter of the swim roller is d, the diameter of the first plate cylinder 11 is D, and the number of teeth of the drive gear 81 is M, the original m1 is m1 = (d / D) · M. However, this is set as (d / D) · M <m2 ≦ 1.03 [(d / D) · M].

  As described above, the circumferential speed of the swim roller 77 is slightly slower than the circumferential speed of the plate cylinder 11 because of the accuracy of the drive gears 81 and 85, the transmission gears 82 and 83, the intermediate gear 84, etc. and the backlash. This is to prevent the peripheral speed of the swim roller 77 from exceeding the peripheral speed of the plate cylinder 11.

  That is, if the circumferential speed of the swim roller 77 is higher than the circumferential speed of the plate cylinder 11, when the swim roller 77 and the plate cylinder 11 come into contact with each other, "slip" occurs, and "gear eyes". This is because of this. Of course, even when the circumferential speed of the swim roller 77 is lower than the circumferential speed of the plate cylinder 11, “slip” occurs. To prevent this, in the present invention, the one-way clutch 100 is provided on the drive side of the swim roller 77. Is provided.

  That is, the drive transmission means is on the same shaft 93 as the drive roller 86 disposed on the side of the swim roller 77 and on the side of the swim roller 77, and on the side close to the swim roller 77. A one-way clutch 100 is provided that can freely rotate 77 in the direction opposite to the rotation direction of the first plate cylinder 11. Therefore, when the swim roller 77 comes into contact with the printing plate P, the swim roller 77 receives a frictional force with the printing plate P and can rotate at the same peripheral speed as the first plate cylinder 11. It becomes possible. In addition, since the one-way clutch 100 is disposed on the side of the swim roller 77, when the swim roller 77 contacts the printing plate P, the transmission gear 82, the transmission gear 83, the intermediate gear 84, and The peripheral speed of the drive gear 85 does not change. For this reason, when the swim roller 77 comes into contact with the printing plate P, the inertia force due to the intermediate gear 84 or the like can be eliminated, and the influence of the inertia force on the rotation speed of the first plate cylinder 11 is minimized. It becomes possible to suppress.

  Even when the swim roller 77 is separated from the plate cylinder 11, unevenness occurs in the supply of the fountain solution unless it rotates at the same rate as possible at the time of contact. For this reason, it has been found that the ratio of the peripheral speed obtained experimentally by the applicant is preferably within 3%. If there is a relatively large speed difference between the contact and separation of the swim roller 77, the fountain solution may be unevenly supplied, and the swim roller 77 may contact the plate cylinder 11. There is a problem that the impact at the time of contact becomes too great.

  A drive transmission gear 87 for transmitting drive to the rider roller 78 is disposed on the side of the swim roller 77. The drive transmission gear 87 meshes with a drive gear 88 disposed on the side of the rider roller 78, and the swim roller 77 and the rider roller 78 rotate in synchronization. The drive transmission gear 87 and the swim roller 77 are configured to be removable from the shaft 93 to which the drive gear 86 is attached. Therefore, the swim roller 77 and the rider roller 78 can be attached and detached separately from the drive transmission means, and the swim roller 77 and the rider roller 78 can be easily attached and detached.

  As described above, the swim roller 77 is centered on the rotation shaft 92 of the transfer roller 76, and the printing plate P mounted on the outer peripheral portion of the first plate cylinder 11 as indicated by a virtual line in FIG. Is movable between a position in contact with the printing plate P and a position separated from the printing plate P.

  When the swim roller 77 having the above configuration is disposed at a position separated from the printing plate P, the swim roller 77 rotates at a peripheral speed slower than the peripheral speed of the first plate cylinder 11. The difference between the number of teeth of the drive gear 86 disposed on the side of the swim roller 77 and the number of teeth of the drive gear 81 disposed on the side of the first plate cylinder 11 is the number of teeth of the drive gear 81. Therefore, the speed difference between the circumferential speed of the swim roller 77 and the circumferential speed of the first plate cylinder 11 at this time is 3% or less of the circumferential speed of the first plate cylinder 11. .

  On the other hand, when the swim roller 77 is disposed at a position in contact with the printing plate P, the swim roller 77 has the same peripheral speed as the first plate cylinder 11 due to the frictional force generated between the swim roller 77 and the printing plate P. Rotates at a peripheral speed of. For this reason, there is no difference in peripheral speed between the first plate cylinder 11 and the swim roller 77, and no gear is generated.

  As described above, since the difference between the circumferential speed of the swim roller 77 at the position in contact with the printing plate P and the circumferential speed of the swim roller 77 at a position separated from the printing plate P is small, the swim roller 77 performs printing. When the plate P is in contact with the plate P, it is possible to keep the dampening water transferred on the swim roller 77 almost constant regardless of the position at which the plate P is separated. Thereby, it becomes possible to always supply a constant dampening solution to the printing plate P mounted on the outer peripheral portion of the first plate cylinder 11.

  In the above description, only the relationship between the first plate cylinder 11 and the swim roller 77 disposed around the first plate cylinder 11 has been described. The relationship between the first and second printing cylinders 11 and 77 is similar to the relationship between the first printing cylinder 11 and the first and second printing rollers 77.

  In the above-described embodiment, the one-way clutch 100 is disposed on the side of the swim roller 77, but may be disposed on another shaft that constitutes the drive transmission means.

  Furthermore, in the above-described embodiment, the first plate cylinder 11 and the second plate cylinder 12 each hold two printing plates P. Each of the plate cylinders 11 and 12 includes a plurality of printing plates P. A single printing plate on which an image area is formed may be held.

1 is a schematic side view of a printing press according to the present invention. 3 is a schematic side view of an ink supply unit in the ink supply apparatus 20. FIG. 3 is a plan view of an ink supply unit in the ink supply apparatus 20. FIG. FIG. 3 is a schematic view showing a dampening water supply unit in the dampening water supply device 21. FIG. 3 is an explanatory view showing, in a developed manner, the relationship between the first plate cylinder 11, a transfer roller 76, a swim roller 77, and a rider roller 78.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 1st printing cylinder 12 2nd printing cylinder 13 1st blanket cylinder 14 2nd blanket cylinder 15 1st impression cylinder 16 2nd impression cylinder 17 Paper feed cylinder 18 Transfer cylinder 19 Paper discharge cylinder 20 Ink supply Device 21 Dampening water supply device 23 Chain 31 Paper feed unit 32 Paper discharge unit 33 Plate feed unit 34 Plate feed unit 35 Image recording device 36 Image recording device 50 Ink 51 Ink source roller 52 Ink supply roller 53 Swing roller 54 Ink key 55 Eccentric cam 56 shaft 57 pulse motor 58 ink form roller 74 storage tank 75 water source roller 76 transfer roller 77 water application roller 78 rider roller 81 drive gear 82 transmission gear 83 transmission gear 84 intermediate gear 85 drive gear 86 drive gear 87 drive transmission Gear 88 Drive gear 91 Axis 92 Axis 93 Axis 94 Axis 100 One-way clutch P Printing Edition

Claims (5)

A plurality of ink supply devices for supplying inks of different colors to a plurality of image areas in a printing plate mounted on the outer periphery of the plate cylinder, and a dampening solution individually for each of the plurality of image areas In a multicolor printing apparatus comprising the same number of dampening water supply devices as the plurality of ink supply devices for supplying,
The dampening water supply device includes a swim roller that is movable between a position in contact with the printing plate and a position separated from the printing plate,
Drive transmission means for transmitting the drive of the plate cylinder to the swim roller to rotate the swim roller at a peripheral speed slower than the peripheral speed of the plate cylinder at a position spaced from the printing plate. And
The multi-color printing apparatus, wherein the drive transmission means includes a one-way clutch that freely rotates the swim roller in a direction opposite to a rotation direction of the plate cylinder. The multicolor printing apparatus according to claim 1,
The multicolor printing apparatus, wherein a speed difference between a circumferential speed of the swim roller and a circumferential speed of the plate cylinder at a position separated from the printing plate is 3% or less of the circumferential speed of the plate cylinder. The multicolor printing apparatus according to claim 1 or 2,
The drive transmission means includes a gear disposed on a side of the plate cylinder, a gear disposed on a side of the swim roller, a gear disposed on a side of the plate cylinder, and the water. An intermediate gear that connects the gear disposed on the side of the form roller,
The one-way clutch is a multicolor printing apparatus disposed between a gear disposed on a side of the swim roller and the swim roller. The multicolor printing apparatus according to claim 1 or 2,
The drive transmission means includes a gear disposed on a side of the plate cylinder, a gear disposed on a side of the swim roller, a gear disposed on a side of the plate cylinder, and the water. An intermediate gear that connects the gear disposed on the side of the form roller,
A multi-color printing apparatus in which a gear disposed on a side of the swim roller has a larger number of teeth than a gear for rotating the swim roller and the plate cylinder at the same peripheral speed. The multicolor printing apparatus according to any one of claims 1 to 4,
Further equipped with a rider roller for leveling the dampening water transferred onto the swim roller,
The multi-color printing apparatus in which the swim roller and the rider roller are rotated at the same peripheral speed via a drive transmission unit different from the drive transmission unit.

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