JP3728034B2 - Printer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is, for example, a printing machine that is most suitable for application to an electronic gravure printing system, and particularly belongs to a technical field for preventing dust from accumulating between a plate material and a doctor blade.
[0002]
[Prior art]
The applicant of the present invention has already filed a high-quality electronic gravure printing system that is optimal for various kinds of color printing, for example, according to Japanese Patent Application No. 5-258854. This electronic gravure printing system obtains image data by electronically editing digital information captured from multimedia such as photographs, scanners, and digital VTRs with an image processing computer. In the system, the image data is directly made on a plastic plate by a laser beam using a plate making machine, and a color printed matter such as a color photograph is printed using the plate made.
[0003]
Therefore, the prior application example of this electronic gravure printing system includes a printing machine 1 as shown in FIGS. 8 and 9, and this printing machine 1 is capable of printing four colors such as cyan, magenta, yellow, and black. By repeating the two-color printing twice, a color print such as a color photograph in which the four colors are overcoated can be obtained, and a small amount of color printing can be performed. Accordingly, the printing machine 1 includes two upper and lower two-stage printing units 4 each having a plate cylinder 2 and an impression cylinder 3 for performing two-color printing, and each plate cylinder 2 of the upper and lower two-stage printing unit 4. An upper and lower two-stage supply / discharge plate device 6 for supplying / discharging the material 5, an ink section 9 having four ink tanks 8 each containing four colors of ink 7 such as cyan, magenta, yellow, black, etc. An upper and lower two-stage ink supply device 14 in which a total of four ink units 13 each having an ink pan 10, an ink roller 11 and a doctor blade 12 are arranged on the upper and lower two-stage plate cylinders 2 respectively, and the four inks in total. An ink circulation device 15 for selectively circulating the four color inks 7 in the four ink tanks 8 with respect to the unit 13 is provided. The doctor blade 12 is made of a metal plate such as stainless steel.
[0004]
As shown in FIG. 9, the ink circulation device 15 includes an ink supply path 19 including a pump 18 that sucks up the ink 7 in each ink tank 8 through a filter 17 and supplies the ink 7 into each ink pan 10, and each ink pan 10. Two ink pans which are provided at the lower part of the upper and lower plate cylinders 2 as will be described later during the printing operation. The ink 7 for two colors is automatically circulated between the two ink tanks 8 in 10. Further, as shown in FIG. 8, the printing machine 1 stacks a paper feed tray 23 in which printing papers 22 before printing, which have been cut to a size such as A3 wide, are stacked and printed printing papers 22 are stacked. A printing paper circulating device 29 including a paper feeding conveyor 25, a paper feeding cylinder 26, a transfer cylinder 27, a paper discharging conveyor 28 and the like for sequentially circulating to the two printing units 4 between the paper discharge tray 24 to be accommodated. It has.
[0005]
At the time of color printing, first, as shown in FIG. 9, image data 5a for each of four colors such as cyan, magenta, yellow, and black in a color photograph is preliminarily surfaced by unevenness on the order of submicrons. Four plate materials 5 made of plastic that have been made (engraved) are prepared in advance. Then, two of the four plate members 5 are supplied to the two printing units 4 by the two supply / discharge plate devices 6 shown in FIG. 8 and are automatically wound around the outer periphery of the two plate cylinders 2. Next, as shown in FIGS. 8 and 9, the ink units 13 for two colors in the upper and lower two-stage ink supply devices 14 are respectively set at the lower part of the upper and lower two-stage plate cylinders 2, and these ink rolls 11. Is brought close to the plate material 5 on the outer periphery of the plate cylinder 2, and the doctor blade 12 is pressed against the surface of the plate material 5. The plate cylinder 2 and the impression cylinder 3 in the upper and lower two-stage printing units 4 are rotated at high speeds in the directions of arrows a and b, respectively, and two ink rolls 11 of the ink unit 13 for two colors set as described above. Is rotated at high speed in the direction of arrow c in synchronization with each plate cylinder 2. Then, the ink circulation device 15 automatically circulates the two colors of ink 7 in the ink tank 8 for two colors in the ink section 9 to the two ink pans 10 in the ink unit 13 for two colors set as described above. To do.
[0006]
Then, the printing paper 22 stacked and set in the paper feeding tray 23 by the paper feeding conveyor 25 in the printing paper circulation device 29 is sequentially taken out from the top, and the first color arranged at the lower stage from the paper feeding cylinder 26 is taken out. Paper is fed to the impression cylinder 3 in the printing unit 4 and the first color is printed on the surface of the printing paper 22. Then, the printing paper 22 after the printing of the first color is continuously fed to the impression cylinder 3 in the printing unit 4 of the second color arranged in the upper stage by the transfer cylinder 27, and the second color is printed on the surface of the printing paper 22. The printing paper 22 for which the second color has been printed is discharged into the discharge tray 24 by the discharge conveyor 28 and stacked. It is to be noted that while supplying the printing paper 22 from the impression cylinder 3 of the first color printing unit 4 to the impression cylinder 3 of the second color printing unit 4 by the transfer cylinder 27, a drying means (see FIG. The printing ink on the surface of the printing paper 22 is quickly dried.
[0007]
In each printing section 4 for two colors, as shown in FIG. 9, the plate cylinder 2 and the impression cylinder 3 are rotated at high speed in the directions of arrows a and b, and the ink 7 supplied into each ink pan 10 is contained in the ink 7. In the state where almost the lower half of each ink roll 11 is immersed, each ink roll 11 is rotated at a high speed in the direction of arrow c in synchronization with the plate cylinder 2, whereby the ink 7 in each ink pan 10 is removed from each plate 5. It is applied on the image data 5a on the surface. Then, a certain amount of ink 7 is applied onto the image data 5a by scraping off the excess ink 7 on the image data 5a by each doctor blade 12. Then, the image data 5a of each plate 5 is transferred to the surface of the printing paper 22 by high-speed transfer in the direction of the arrow d while pressing the printing paper 22 against the surface of each plate 5 by each impression cylinder 3. Thus, two-color printing is performed in which the color-specific color print 5b is applied twice on the surface of the printing paper 22.
[0008]
Then, after two-color printing is performed on a predetermined number of sheets of printing paper 22 in this way, two printed plates 5 on the outer periphery of the two plate cylinders 2 of the upper and lower two-stage printing unit 4 are arranged in two upper and lower stages. The two supply plates 5 are automatically replaced with two new plate materials 5 and the printed two-color ink units 13 of the two upper and lower ink supply devices 14 are replaced with new two-color ink units 13. Then set it again at the bottom of the upper and lower plate cylinders 2. Then, the predetermined number of printing papers 22 after the two-color printing is set again in the paper feed tray 23, and the two colors of ink 7 in the ink tank 8 for two new colors of the ink section 9 are applied by the ink circulation device 15. While automatically circulating the two ink pans 10 of the new two-color ink unit 13, the printing paper 22 in the paper feed tray 23 is circulated again to the two printing units 4 by the printing paper circulation device 29 and the same as described above. By performing the two-color printing again, a color print 5b such as a color photograph in which four colors of ink 7 such as cyan, magenta, yellow and black are overcoated is obtained. Therefore, according to this printing machine 1, by exchanging the plate material 5 with respect to the plate cylinder 2, various kinds of color printing can be efficiently performed.
[0009]
[Problems to be solved by the invention]
By the way, as shown in FIG. 9, various kinds of dust D such as a coating material and paper powder peeled off from the surface of the printing paper 22 are attached to the surface of the printing paper 22 supplied to the printing unit 4. The dust D is transferred to the surface of the plate 5 as it is. Further, when transferring the image data 5 a of the plate material 5 to the printing paper 22, various dusts D such as a coating material and paper dust on the surface of the printing paper 22 are peeled off from the printing paper 22 on the surface of the printing material 5. Transcribed. Accordingly, various kinds of dust D such as coating material and paper dust adhere to the surface of the plate material 5, and this dust D is scraped together with the ink 7 by the doctor blade 12 to obtain the plate material 5, the doctor blade 12, and the like. It is gradually accumulated during the period. The dust D mixes with the ink 7, and eventually hardens to become a lump of dust D. The lump of dust D bites between the plastic plate material 5 and the metal doctor blade 12, and the doctor D As a result of being strongly pressed against the surface of the plate material 5 by the pressing force of the blade 12, streaky scratches are generated on the surface of the soft plate material 5 made of plastic, and the printing durability of the plate material 5 is significantly reduced. There is a problem in that streaky stains are generated on the printed matter 5b, and the quality of the color printed matter 5b is significantly deteriorated.
[0010]
  The present invention has been made to solve the above problems,Adhered to the surface of printing paperVarious garbage such as coating materials and paper dustCan be removedThe purpose is to provide a printing press.
[0011]
[Means for Solving the Problems]
  In order to achieve the above object, a printing machine according to the present invention comprises a plate material wound around the outer periphery of a plate cylinder, an ink pan, an ink roll, and a doctor blade for applying a certain amount of ink to the surface of the plate material. An ink unitServingPrinting paper fedA pressure cylinder that presses the outer periphery of the plate material, and the outer periphery of the impression cylinder is pressed against the surface of the printing paper to be supplied by the outer peripheral adhesive layer and driven to rotate, and is attached to the surface of the printing paper. A first dust removing roller that removes dust from the surface of the printing paper by the adhesive layer, and an outer peripheral adhesive layer set to an adhesive force larger than the adhesive force of the adhesive layer of the first dust removing roller. A second dust removal roller that is pressed and rotated by the pressure-sensitive adhesive layer of the first dust removal roller, and transfers the dust from the pressure-sensitive adhesive layer of the first dust removal roller to the pressure-sensitive adhesive layer having a large adhesive force; A cleaning bowl containing a cleaning liquid in which a part of the adhesive layer of the second dust removing roller is immersed, and the cleaning bowl installed in the cleaning bowl to remove the dust from the adhesive layer of the second dust removing roller. Scrape off from the surface into the cleaning bowl And a blade for Mi removalIs.
[0012]
  The printing press according to the present invention configured as described above is configured such that dust adhered to the surface of the printing paper in the process of feeding the printing paper to the plate cylinder.Is peeled off from the printing paper by the adhesive layer on the outer periphery of the first dust removing roller that is pressed by the adhesive layer on the outer surface of the impression cylinder and is driven to rotate, and then the second It is an adhesive layer on the outer periphery of the dust removal roller, which is transferred to an adhesive layer set to have a larger adhesive force than the adhesive layer on the outer periphery of the first dust removal roller and immersed in the cleaning liquid in the cleaning tank. The dust is scraped off from the adhesive layer on the outer periphery of the second dust removing roller into the cleaning layer by a dust removing blade.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a printer of an electronic gravure printing system will be described with reference to FIGS. Note that the same reference numerals are given to the same structural portions as those in FIGS. 8 and 9 to omit redundant description.
[0014]
“First Embodiment”
First, with reference to FIG. 1, a first embodiment of a dust removing device 31 that is dust removing means in the printing press 1 of the present invention will be described. The dust removing device 31 is installed in the process of supplying the printing paper 22 to the lower printing unit 4 to which the printing paper 22 is first supplied in the upper and lower two printing units 4 shown in FIG. The dust removing device 31 uses first and second dust removing rollers 32 and 33 which are dust removing members, and the outer periphery of the first and second dust removing rollers is adhesive. Adhesive layers 32a and 33a for removing dust (transferring dust) by force are formed. The adhesive force of the adhesive layer 33a of the second dust removal roller 33 is set larger than the adhesive force of the adhesive layer 32a of the first dust removal roller 32. Then, the first dust removing roller 32 arranged at the upper part is brought close to the lower part of the impression cylinder 3 with a gap slightly smaller than the thickness of the printing paper 22, and the second dust removing roller arranged at the lower part. A roller 33 is pressure-bonded to the lower part of the first dust removing roller 32 from below. The substantially lower half of the second dust removing roller 33 is immersed in the cleaning liquid 35 in the cleaning tank 34 as a cleaning means, and the tip of the dust removing blade 36 attached to the cleaning tank 34 is The second dust removal roller 33 is in contact with the outer periphery.
[0015]
According to the dust removing device 31, the impression cylinder 3 rotates in the direction of arrow b during the printing operation, and the printing paper 22 is supplied between the plate cylinder 2 and the impression cylinder 3 in the printing unit 4 from the direction of arrow d. At this time, the rotational force of the impression cylinder 3 is sequentially transmitted to the first and second dust removing rollers 32 and 33 via the printing paper 22, and the first and second dust removing rollers 32 and 33 are connected to each other. Each is rotated following the directions of arrows e and f. Then, the printing paper 22 passes between the impression cylinder 3 and the first dust removal roller 32 and is supplied to the printing unit 4, and the coating material / paper adhered to the surface of the printing paper 22. The various dusts D such as powder are adhered to the adhesive layer 32a of the first dust removing roller 32, and the dust D is peeled off from the surface of the printing paper 22, and the first dust removing roller. 32. Then, the dust D adhered to the adhesive layer 32a of the first dust removing roller 32 is transferred to the adhesive layer 33a of the second dust removing roller 33, which has a higher adhesive force, and washed. It is moved through the cleaning liquid 35 in the tank 34. Then, when the dust D is washed by the cleaning liquid 35 and the dust D is easily separated from the adhesive layer 33a of the second dust removing roller 33, the dust D is removed by the dust removing blade 36. The adhesive layer 32a, 33a is wetted by the cleaning liquid 35 and recovered from the adhesive force while being scraped off from the dust removing roller 33 and collected in the cleaning tank 34.
[0016]
Therefore, according to the dust removing device 31, various dusts D attached to the surface of the printing paper 22 can be removed in the course of supplying the printing paper 22 to the printing unit 4. It is possible to prevent D from being supplied to the printing unit 4 and attached to the surface of the plate 5 and accumulating between the plate 5 and the doctor blade 12. In the dust removing device 31, the cleaning liquid 35 mixed with the dust D in the cleaning tank 34 is collected in the cleaning liquid tank 39 by the cleaning liquid discharge path 38, and then the cleaning liquid 35 in the cleaning liquid tank 39 is supplied to the cleaning liquid supply path 40. A clean washing liquid 35 from which dust D has been removed by the filter 42 is sucked through the filter 42 by the pump 41 therein, and is supplied into the washing tank 34. In the first embodiment, a brush roller having brushes radially arranged on the outer periphery is used as a dust removing member, and the brush roller is driven by a driving source such as a motor in the direction of supply of the printing paper 22 (arrow d direction). The dust D adhering to the surface of the printing paper 22 can also be removed by rotating in the reverse direction.
[0017]
“Second Embodiment”
Next, a second embodiment of the dust removing device 51 as dust removing means in the printing press 1 of the present invention will be described with reference to FIGS. The dust removing device 51 is configured such that, in the upper and lower two-stage printing units 4 shown in FIG. 8, the plate cylinder 2 on the side opposite to the impression cylinder 3 in the lower printing unit 4 to which the printing paper 22 is first supplied. Installed in the department. The dust removing device 51 uses a dust removing roller 52 that is a dust removing member, and a sponge for adsorbing and removing dust on the outer periphery of the dust removing roller 52 by a wiping method, A wiping layer 52a formed of an elastic means having an appropriate cushioning property and adsorbing property such as a nonwoven fabric, felt, or cloth is formed. The dust removing roller 52 is horizontally and rotatably mounted on a roller slider 53 by a roller shaft 52b, and a pair of slide rails in which the roller slider 53 is fixed horizontally at a fixed position. 54 is slidably mounted horizontally on 54. The tip of the cylinder rod 55a of the air cylinder 55 that is horizontally fixed at a fixed position is connected to the center in the length direction of the roller slider 53. The roller slider 53 is moved on the slide rail 48 by the air cylinder 55 by the arrow g. 2 and FIG. 3, by sliding driving in the h direction, the operation position where the dust removing roller 51 is lightly pressed against the surface of the plate 5, as shown by solid lines in FIG. 2 and FIG. As indicated by a chain line, the dust removing roller 52 is configured to be slidable between a retracted position completely separated from the surface of the plate 5. A stepping motor 56 serving as intermittent feeding means is attached to one end side of the roller slider 53 via a gear box 57, and one end of the roller shaft 52 b is connected to an output shaft 57 a of the gear box 57 via a coupling 58. Directly connected.
[0018]
A method of driving the dust removing device 51 will be described with reference to the control circuit shown in FIG. First, at the time of plate feeding in which the plate material 5 is wound around the outer periphery of the plate cylinder 2, a plate feeding signal S is sent to a CPU (microcomputer) 61 of the dust removing device 51.₁ The CPU 61 switches the air switching valve 62 and pulls the cylinder rod 55a of the air cylinder 55 in the direction of the arrow h, and the roller slider 53 is slid on the slide rail 54 in the direction of the arrow h, so that the dust removal roller 52 is driven. Is slid in the direction of the arrow h to the retracted position indicated by the one-dot chain line in FIGS. Then, at the start of printing after the end of the winding operation of the plate material 5 around the outer periphery of the plate cylinder 2, the doctor blade 12 of the ink unit 13 is raised to a position where it contacts the plate material 5, and at the same time the doctor UP signal S₂ Enters the CPU 61, the CPU 61 switches the air switching valve 62, pushes the rod 55 a of the air cylinder 55 in the direction of arrow g, and the roller slider 53 is slid in the direction of arrow g on the slide rail 48 to remove dust removal rollers. 2 and 3 are slid in the direction of the arrow g to the operation position indicated by the solid line in FIGS. 2 and 3, and the wiping layer 52 a on the outer periphery is lightly pressed against the surface of the plate material 5. At this time, the pressure of the air cylinder 55 is controlled to be a value determined by an air pressure sensor (not shown).
[0019]
During the printing operation, while the rotation of the dust removing roller 52 lightly pressed against the surface of the plate material 5 is stopped by the stepping motor 56 and the gear box 57, the plate material 5 is moved in the direction of arrow a by the plate cylinder 2. Rotating drive. Then, various kinds of dust D such as a coating material and paper dust attached to the surface of the plate material 5 are wiped (wiped off) by the wiping layer 52a of the dust removing roller 52, and the dust D is wiped off. The dust D is adsorbed by 52a, and the dust D is removed (trapped) from the surface of the plate 5 in front of the ink roll 11 by the dust removing roller 52 portion. Accordingly, the dust D adhering to the surface of the plate material 5 does not reach the ink roll 11 or the doctor blade 12 portion of the ink unit 13, and this dust D is accumulated between the plate material 5 and the doctor blade 12. Can be prevented in advance. Since the wiping layer 52a of the dust removal roller 52 has an appropriate cushioning property, even if the wiping layer 52a rubs the surface of the plate material 5, the image data 5a on the surface of the plate material 5 is damaged. There is no worry at all.
[0020]
During the printing operation, the number of printed sheets is counted by the number of printed sheets counter 63. When a certain number of sheets (for example, 1000 sheets) is printed, a signal is sent to the CPU 61, and the CPU 61 sends a drive signal to the stepping motor driver 64. Then, the stepping motor 56 is rotationally driven by a predetermined pitch that is a predetermined angle, and the dust removing roller 52 is fixed in the direction of the arrow i through the gear box 57, the output shaft 57a, the coupling 58, and the roller shaft 52b. Is only intermittently driven (sent). As a result, the portion of the wiping layer 52a that is soiled with the dust D is removed from the surface of the plate material 5 in the direction of arrow i by printing a certain number of sheets, and the clean and brand-new portion of the wiping layer 52a is in the direction of arrow i. It is sent out and brought into contact with the surface of the plate 5. That is, when the dust D on the surface of the printing plate 5 is removed by the dust removing roller 52, if the dust D is adsorbed to the dust removing roller 52 by a certain amount or more, the dust removing roller 52, on the contrary, There is a possibility that dust D will be transferred to the surface of the plate 5. Accordingly, it is desirable that the dust removal roller 52 is intermittently sent out in the direction of the arrow i at a constant pitch every time a certain number of sheets are printed.
[0021]
At the end of printing, the doctor blade 12 of the ink unit 13 is lowered to the position where the doctor blade 12 is removed from the plate material 5 and at the same time, the doctor DOWN signal S_Three Enters the CPU 61, and the CPU 61 switches the air switching valve 62 and pulls the cylinder rod 55a of the air cylinder 55 in the direction of the arrow h, so that the dust removal roller 52 is once again shown in FIGS. It is slid in the direction of the arrow h to the retracted position indicated by the chain line and pulled away from the plate cylinder 2. At the same time, the CPU 61 sends a drive signal to the stepping motor driver 64 and drives the stepping motor 56 to rotate at a predetermined angle, so that the dust removal roller 52 is again constant in the direction of the arrow i as described above. It is driven to rotate intermittently by the pitch. Then, since the brand new portion of the wiping layer 52a of the dust removing roller 52 is sent to a position facing the surface of the plate material 5, the dust removing roller 52 is next pressed against the surface of the plate material 5. It is possible to prevent the surface of the plate material 5 from being soiled by the soiled portion of the wiping layer 52a.
[0022]
At the time of discharging the plate material 5 to remove the plate material 5 from the outer periphery of the plate cylinder 2, the discharged plate signal S_Four Is sent to the CPU 61, the air switching valve 62 is switched, and the cylinder rod 55a of the air cylinder 55 is pulled in the direction of arrow h. It should be noted that the cylinder rod 55a of the air cylinder 55 should be pulled in the direction of the arrow h in both cases of feeding and discharging, but for the sake of safety, the cylinder rod 55a is pulled in the direction of the arrow h. Do. The above operation is a normal automatic control operation. In the event of an emergency, the manual switch 65 also allows the dust removal roller 52 to be attached to and removed from the surface of the plate 5 in the direction indicated by the arrows g and h and dust removal. It is desirable that the roller 52 can be rotated at a constant pitch in the direction of arrow i. Further, at the time of printing, the dust removal roller 52a is fixed by the stepping motor 56 via the gear box 57. If there is a possibility that the dust removal roller 52 may be driven to rotate by the rotational force of the plate cylinder 2, It is desirable to add a one-way clutch or the like. When the entire circumference of the wiping layer 52a of the dust removal roller 52 is contaminated by dust D, the CPU 61 displays a warning by a warning display means 66 such as a buzzer or light emission, and the operator makes the dust removal roller 52 new. Perform replacement work. At this time, the cleaning tank 34 and the dust removing doctor blade 36 which are the cleaning means shown in FIG. 1 are used, and the dust D adsorbed on the surface of the dust removing roller 52 is scraped off while being cleaned with the cleaning liquid 34. Further, the dust removal roller 52 can be continuously used while being cleaned without replacing the dust removal roller 52.
[0023]
“Third Embodiment”
Next, a third embodiment of the dust removing device 71 which is dust removing means in the printing press 1 of the present invention will be described with reference to FIGS. The dust removing device 44 is arranged in the upper and lower two-stage printing unit 4 shown in FIG. 8 on the side opposite to the impression cylinder 3 of the plate cylinder 2 in the lower printing unit 4 to which the printing paper 22 is first supplied. It is arranged in the part. The dust removing device 71 uses a dust removing belt 72 that is a dust removing member. The dust removing belt 72 adsorbs and removes dust by a wiping method, a nonwoven fabric, a felt. Or a member having absorptive property such as sponge on the surface of the belt-like base and a member also serving as an elastic means. A supply roller 73 and a take-up roller 74 are horizontally and rotatably attached to a pair of upper and lower roller mounting bases 75 and 76, which are horizontally fixed at fixed positions, by these roller shafts 73a and 74a. Thus, the dust removing belt 72 is intermittently supplied (fed out) sequentially from the outer periphery of the supply roller 73 in the direction of arrow j, and is intermittently wound around the outer periphery of the winding roller 74 in the direction of arrow j. It is configured. The vertical positions of the supply roller 73 and the take-up roller 74 may be reversed. Stepping motors 77 and 78 serving as intermittent feeding means are attached to one end sides of a pair of upper and lower roller mounting bases 75 and 76 via gear boxes 79 and 80, respectively. One ends of the shafts 73a and 74a are directly connected to the output shafts 79a and 80a of the gear boxes 79 and 80 via couplings 81 and 82, respectively.
[0024]
An elastic roller 84 having an elastic layer 83a, which is an elastic means having sufficient elasticity, such as sponge or rubber on the outer periphery, is located between the supply roller 73 and the take-up roller 74 at an intermediate position above and below the dust removing belt 72. The elastic roller 83 is disposed on the opposite side of the plate cylinder 2 in parallel therewith, and the elastic roller 83 is attached to the roller slider 84 in parallel and rotatably by a roller shaft 83b. The roller slider 84 is slidably mounted horizontally on a pair of slide rails 85 fixed horizontally at a fixed position, and the cylinder rod 86a of the air cylinder 86 fixed horizontally at the fixed position. The front end of the roller slider 84 is coupled to the center of the roller slider 84 in the longitudinal direction, and is slidably driven by the air cylinder 86 in the directions of the roller slider 84 and the arrows k and m.
[0025]
According to the dust removing device 71, first, when feeding the plate material 52 around the outer periphery of the plate cylinder 2, the cylinder rod 86a of the air cylinder 86 is shown in FIG. Is pulled in the direction of the arrow m, the roller slider 84 is slid in the direction of the arrow m on the slide rail 85, and the elastic roller 83 is slid in the direction of the arrow m to the retracted position to be separated from the plate cylinder 2 and for dust removal. The belt 72 is tensioned between the supply roller 73 and the take-up roller 74 as shown by a one-dot chain line in FIG. 5, and the dust removing belt 72 is pulled away from the plate cylinder 2.
[0026]
Next, at the start of printing, as shown by solid lines in FIGS. 5 and 6, the supply roller 73 is fixed in the direction of arrow n via the stepping motor 77, the gear box 79, the output shaft 79a, the coupling 81, and the roller shaft 73a. The cylinder rod 86a of the air cylinder 86 is pushed out in the direction of the arrow k while the dust removal belt 72 is supplied (feeded out) by a fixed amount in the direction of the arrow i from the supply roller 73. The elastic roller 83 is slid in the direction of the arrow k on the slide rail 85 to slide the elastic roller 83 to the operating position in the direction of the arrow k. Hit it. Then, during the printing operation, when the plate material 5 is rotationally driven by the plate cylinder 2 in the direction of the arrow a, various kinds of dust D such as coating material and paper dust attached to the surface of the plate material 5 are collected. The surface of the removal belt 72 is wiped (swept away), and the dust D is adsorbed on the surface of the dust removal belt 72 and removed (trapped) from the surface of the plate material 5. Accordingly, the dust D adhering to the surface of the plate material 5 does not reach the ink roller 11 or the doctor blade 12 portion of the ink unit 13, and this dust D is accumulated between the plate material 5 and the doctor blade 12. Can be prevented in advance. The dust removal belt 72 is elastically pressed against the surface of the plate material 5 against the elastic layer 83a on the outer periphery of the elastic roller 83, so that even if the dust removal belt 72 rubs the surface of the plate material 5, There is no fear of damaging the image data 5a on the surface of the plate 5.
[0027]
During the printing operation, the number of printed sheets is counted, and when a certain number of sheets (for example, 1000 sheets) is printed, the cylinder rod of the air cylinder 86 is shown in FIG. 86a is pulled in the direction of the arrow m, the elastic roller 83 is pulled away from the surface of the plate 5 in the direction of the arrow k, and the supply roller 73 and the winding roller 74 are simultaneously driven by the stepping motors 77, 78 by the gear boxes 79, 80, the output shaft. 79a, 80a, couplings 81, 82 and output shafts 79a, 80a are rotated by a predetermined angle in the directions of arrows n, o to move the dust removal belt 72 from the supply roller 73 to the take-up roller 74. Wind a certain amount in the direction of arrow i. As a result, the portion of the dust removal belt 72 that is contaminated with the dust D located at the front surface of the elastic roller 83 is wound on the take-up roller 74 side, and the brand-new portion that is not dirty is fed out to the front surface of the elastic roller 83. In preparation for the next printing operation. Therefore, during the next printing operation, the dust D on the surface of the plate 5 can be adsorbed and removed by the wiping method at the brand new portion of the dust removing belt 72 in the same manner as described above. When all of the dust removal belt 72 supplied from the supply roller 73 is used up by repeating this operation, the dust removal belt 72 is replaced with a new one. At this time, the dust removing belt 72 is wound endlessly between the supply roller 73 and the take-up roller 74, and passes between the elastic roller 83 and the plate cylinder 2 from the supply roller 73 to the take-up roller 74. When the path from the supply roller 73 to the supply roller 74 through the opposite side of the plate cylinder 2 of the elastic roller 83 is a double path, a cleaning means is provided in the middle of the double path. The portion of the dust removal belt 72 that is contaminated with dust can be washed sequentially, and the dust removal belt 72 can be continuously used while washing without being replaced.
[0028]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made based on the technical idea of the present invention. For example, the present invention is not limited to a printer of an electronic gravure printing system, but can be widely applied to a printer of a so-called intaglio printing system.
[0029]
  The printing press of the present invention configured as described above,In the process of supplying the printing paper to the plate cylinder, the dust adhered to the surface of the printing paper is pressed by the adhesive layer on the surface of the supplied printing paper on the outer periphery of the impression cylinder to be driven and rotated first. The adhesive layer on the outer periphery of the second dust removing roller is peeled off from the printing paper by the adhesive layer on the outer periphery of the dust removing roller, and has a larger adhesive force than the adhesive layer on the outer periphery of the first dust removing roller. It is transferred to the set adhesive layer and immersed in the cleaning liquid in the cleaning tank. Finally, the dust is scraped off from the adhesive layer on the outer periphery of the second dust removing roller into the cleaning layer by the dust removing blade. Since the cleaning liquid in the cleaning tank is transferred to the first and second dust removing rollers, the adhesive strength of the outer peripheral adhesive layer is always recovered, and the dust scraping action by the doctor blade Combined to ensure the removal of dust It can be carried out in. Accordingly, the dust accumulated between the plate material and the doctor blade is mixed with the ink and hardened to become a lump of dust, and the lump of dust bites between the plate material and the doctor blade, and the plate material It is possible to prevent the occurrence of streak on the surface of the paper, and the printing durability of the plate material can be remarkably improved, and the streak of color prints is not generated. High quality color prints can be printed. Incidentally, by applying the present invention, the printing durability of the plate material could be improved 40 to 50 times from about 100 sheets to about 4,000 to 5,000 sheets.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view illustrating a first embodiment in which the present invention is applied to a printing press of an electronic gravure printing system.
FIG. 2 is a partially cutaway side view illustrating a second embodiment in which the present invention is applied to a printing press of an electronic gravure printing system.
FIG. 3 is a partial plan view of FIG. 2;
FIG. 4 is a block diagram for explaining a dust removal roller control circuit according to the second embodiment;
FIG. 5 is a partially cutaway plan view illustrating a third embodiment in which the present invention is applied to a printing press of an electronic gravure printing system.
6 is a partial plan view when the dust removing belt of FIG. 5 is pressed against the plane of the plate material. FIG.
7 is a partial plan view when the dust removing belt of FIG. 5 is pulled away from the surface of the printing plate.
FIG. 8 is a schematic side view showing the entire printing machine.
FIG. 9 is a partially cutaway side view showing a printing unit and an ink unit in a printing press.
[Explanation of symbols]
1 is a printing machine, 2 is a printing cylinder, 3 is an impression cylinder, 4 is a printing unit, 5 is a printing plate, 7 is ink, 10 is an ink pan, 11 is an ink roll, 12 is a doctor blade, 13 is an ink unit, 22 is Printing paper 31, 31 and 71 are dust removing devices as dust removing means, 32 is a dust removing roller as dust removing member having adhesive force, 34 is a washing tank as washing means, 36 is a dust removing blade, 52 is a dust removing roller which is a dust removing member for removing dust by a wiping method, 52a is a wiping layer, 55 is an air cylinder which is a contact and separation means, 56 is a stepping motor which is an intermittent feeding means, and 72 is a wiping method. A dust removing belt for removing dust, 77 and 78 are stepping motors as intermittent feeding means, and 83 is an elastic roller as elastic means.

Claims (1)

A plate material wound around the outer periphery of the plate cylinder;
An ink unit comprising an ink pan, an ink roll and a doctor blade for applying a certain amount of ink to the surface of the plate material;
The printing paper which is subjected sheet and an impression cylinder which presses the outer periphery of the plate material,
At the outer periphery of the impression cylinder, the surface of the printing paper to be supplied is pressed by the outer peripheral adhesive layer and driven to rotate, and the dust adhering to the surface of the printing paper is removed from the surface of the printing paper by the adhesive layer. A first dust removal roller to be removed;
The pressure-sensitive adhesive layer of the first dust removal roller is pressed against the pressure-sensitive adhesive layer of the first dust-removing roller by the pressure-sensitive adhesive layer on the outer periphery set to be larger than the pressure-sensitive adhesive force of the pressure-sensitive adhesive layer of the first dust-removing roller. A second dust removing roller for transferring from the adhesive layer of the one dust removing roller to the adhesive layer having a large adhesive force;
A cleaning bowl containing a cleaning liquid into which a part of the adhesive layer of the second dust removing roller is immersed;
A printing apparatus, comprising: a dust removal blade installed in the cleaning tub and scraping the trash from the surface of the adhesive layer of the second dust removal roller into the cleaning tub. Machine.

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