JP4052638B2 - Method of forming a coating film on a cylindrical object to be coated by an ink jet printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coated film forming method which is applicable to gravure plate, flexographic plate, endless offset plate and rotary screen plate as cylindrical bodies to be coated having variously different diameters and is capable of printing excellent all surface coating, negative mask or positive mask without causing pinholes by the use of raster scanning method. <P>SOLUTION: The cylindrical bodies to be coated are chucked at both ends by means of a cylindrical body-chuck rotation means, a diameter D of the body to be coated is inputted into the computer and the output pulse number N of a rotary encoder assigned for subjecting the body to be coated to one intermittent rotation is calculated by the computer. A printer head having a number of ink jet nozzles which are arranged with a prescribed pitch in the circumferential direction of the body to be coated is arranged closely to one end of the body to be coated and is scanned in the axial direction. At the same time, the injection of coated film forming ink from respective ink jet nozzles or the stopping of the injection is repeated necessary number of times and, thereby, the all surface coating, the negative mask or the positive mask is printed on the body to be coated by means of the raster scanning method. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Technical field to which the invention belongs]
  The present invention can be applied to the production of gravure plates, flexographic plates, endless offset plates, and rotary screen plates, which are cylindrical coating film forming bodies having various diameters, and the raster scan method is excellent in that pinholes do not occur. The present invention relates to a method of forming a coating film on a cylindrical coating film forming body by an ink jet printer, which can print a whole surface coating film, a negative mask or a positive mask.
[0002]
[Prior art]
  A conventional photolithographic gravure plate-making method involves coating and forming a photosensitive film on a plate-making roll, forming a latent image by laser exposure, developing to form a negative resist mask, and exposing the exposed surface of the thick copper sulfate plating. Etching forms cells, removes the resist image, and finally chrome plating.
[0003]
  In the conventional flexographic plate making method, an ultraviolet-sensitive flexo agent is formed endlessly on the outer periphery of the roll, black-coated, a negative mask is formed by laser ablation, the entire surface is irradiated with ultraviolet rays, and developed to engrave the non-image area. Or a heat-sublimable flexographic agent is formed endlessly on the outer periphery of the roll and engraved by irradiating a laser to form a negative image.
[0004]
  In conventional offset printing, a hydrophilic film formed on an aluminum thin plate is irradiated with a laser so as to form a positive image, and the laser irradiated portion is made oil-sensitive so that oil-based ink can be attached thereto.
[0005]
  In conventional rotary screen plate making, a stainless steel roll is coated with a photosensitive film that is not eroded by a plating solution, baked and developed to leave a positive resist, and then a thick nickel plating is applied, and pressure is applied to the stainless steel roll. The nickel sleeve is peeled from the roll and the sleeve holding material is fixed to both ends.
[0006]
[Problems to be solved by the invention]
  Photolithographic methodByThe major problem when manufacturing gravure plates, flexographic plates, on-demand offset plates, and rotary screen plates is how to avoid the occurrence of pinholes when applying photosensitive films, etc. It has become.
[0007]
  On the other hand, there is a need for computer tow plates.
  As for the method of forming a coating film on a cylindrical coating film forming body by an ink jet printer, unit coating lines of a certain width are formed in a chain when arrayed in a line at a predetermined pitch and sprayed with coating film forming ink from each. A printer head having a large number of inkjet nozzles has been put to practical use in a raster scan method for textile printing, and is prepared for gravure plates, flexographic plates, endless offset plates, and rotary screen plates using this printer head. Therefore, there is a demand for a technique for printing a full-surface coating film, a negative mask, or a positive mask by a raster scan method on cylindrical coating film forming bodies having various diameters.
[0008]
  The present invention can be applied to the production of gravure plates, flexographic plates, endless offset plates, and rotary screen plates, which are cylindrical coating film forming bodies having various diameters, and the raster scan method is excellent in that pinholes do not occur. It is an object of the present invention to provide a method of forming a coating film on a cylindrical coating film forming body by an ink jet printer, which can print a whole surface coating film, a negative mask or a positive mask.
[0009]
[Means for Solving the Problems]
  The method for forming a coating film of a cylindrical coating film by an ink jet printer according to the present invention includes a cylindrical chuck coating rotating means having a rotary encoder on a spindle and chucking the cylindrical coating film forming body on both ends.And the process,
  A tape of a wiping cloth that is not self-dusting is unwound from an original reel and is slidably contacted with one end of the film-forming body that is rotated to wind up and adhere to the film-forming body with the tape. A wiping head for wiping away dirt and oil that has been removed is provided on the lower side of the coating film forming body, and is raised corresponding to one end of the lower surface of the rotated coating film forming body so as to slide on the tape. The process of moving to the other end and wiping off dirt and oil that adheres to the coating film forming body with the tape,
  On the computerSaidThe number N of output pulses of the rotary encoder assigned to input the diameter D of the film formation body and rotate the film formation body intermittently by a computer (N= A × B × P / πD)Process,
(In the above equation, A is the total number of output pulses per rotation of the rotary encoder, and B isInkjet nozzleNumber of nozzles, P is the arrangement pitch of inkjet nozzlesIt is.)
  A printer head having a large number of inkjet nozzles that are arranged at a predetermined pitch in the circumferential direction of the coating film forming body and that form a unit coating line with a constant width by overlapping the film forming ink in a chained manner in the circumferential direction.SaidProximity to one end of the film formation body,SaidPrinter headSaidThe inkjet nozzle that scans in the axial direction of the coating film forming bodyEach ofThe coating film forming ink is ejected based on the digital data signal assigned to each unit coating line segment of the entire surface coating film, the negative mask or the positive mask image data, or the ejection is stopped.Process and,
Including
  Every time a raster scan is printed,SaidThe output pulse of the rotary encoderin frontAs described above, the motor rotates intermittently so that only N is counted.SaidInkjet nozzleEach ofRepeating the necessary number of times to shoot or stop spraying the film-forming ink from
  Therefore, the entire surface coating film, negative mask or positive mask is printed on the coating film forming body by a raster scanning method.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
  A method of forming a coating film of a cylindrical coating film forming body by the ink jet printer of the present invention.,A description will be given with reference to an ink-jet printer apparatus for plate making.
  FIG. 1 is a front view of an ink jet printer apparatus for plate making according to the present invention.
  FIG. 2 is an enlarged side view of a main part before starting the operation of the wiping head.
  FIG. 3 is an enlarged side view of the main part during the operation of the wiping head.
[0011]
  The coating film forming method of the cylindrical coating film forming body by the inkjet printer of this embodiment is
  The coated film forming body R is chucked at both ends by the roll chuck rotating means 3 and the diameter D and the length L are input.
[0012]
  The number of rotations appropriate for wiping is calculated, the coating film forming body R is rotated, and the coating film forming body R rotated by the wiping head is wiped from one end to the other end. The rotation of the formed body R is stopped, the film forming ink is ejected from the ink jet nozzle 22a while scanning the printer head 22 in the axial direction, and after that, when intermittently rotated, printing is repeated to form a coating film. On the body R, the entire surface coating film, negative mask or positive mask is printed.
[0013]
  When both ends of the coated film forming body R are chucked by the roll chuck rotating means 3 and the diameter D and the length L are input to the computer, the computer performs a calculation for calculating the rotation speed suitable for wiping. In this calculation, the rotational speed is determined so that the peripheral speed is constant even if the diameter of the coating film forming body R is large or small.
[0014]
  Wiping is performed by winding a tape T of a wiping cloth that is not self-dusting from the original reel 13 while sliding it against one end of a coating film forming body R that is rotated and winding it. A wiping head for wiping off dirt and oils adhering to the film forming body R is provided on the lower side of the film forming body R, and the tape T is lifted corresponding to one end of the lower surface of the film forming body R. It slides and moves to the other end, and the tape T cleans the dirt and oils adhering to the coating film forming body R.
[0015]
  After wiping, the rotation of the coating film forming body R is stopped in order to perform printing by the raster scan method with the printer head 22 having a large number of inkjet nozzles 22a.
[0016]
  A printer head 22 having a large number of ink jet nozzles 22a is brought close to one end of the coating film forming body R, and raster scanning is performed once on the coating film forming body R, and image data of the entire coating film, negative mask or positive mask. Based on the digital data signal assigned to each unit coating line segment, the ink for forming the coating film is ejected from each inkjet nozzle 22a with the width of the unit coating line or is stopped, and printing is performed in a straight line.
[0017]
  After printing by one raster scan, the coating film forming body R is intermittently rotated. In this case, even if the diameter of the coating film forming body is large or small, the overlap between the unit coating lines formed by the raster scan of the printer head 22 with the intermittent rotational feed is the overlap between the nozzles forming the unit coating line. It is necessary to match the lap with high precision.
[0018]
  Therefore, the output pulse of the rotary encoder 30 provided in the drive spindle of the cylindrical chuck rotating means 3 is set as a control amount for intermittently feeding the coating film forming body R.
[0019]
  The diameter D of the coating film forming body is inputted to the computer, and the computer calculates the number N of output pulses assigned to rotate the coating film forming body of the rotary encoder for one intermittent rotation, thereby intermittently forming the coating film forming body R. Rotational feed is controlled with high precision.
[0020]
  And every time the printing of one raster scan is finished, the coating film forming body R is intermittently rotated and the output pulse of the rotary encoder is counted by N to stop the intermittent rotation of the coating film forming body R, In the same manner as described above, the coating film forming ink is ejected from each inkjet nozzle or the ejection is stopped as many times as necessary, and the entire surface coating film, negative mask or positive mask is printed on the coating film forming body by the raster scan method. Details will be described below.
[0021]
  First, the structure portion that rotates by chucking both ends of the coating film forming body R will be described.
[0022]
  In FIG. 1, a casing 1 is provided with a roll door 1 at the upper part of the front surface and a roll door 2 that rises and closes the roll door 1 a.
[0023]
  A cylindrical chuck rotating means 3 is provided in the casing 1. The cylindrical chuck rotating means 3 includes a drive side chuck 3a that is rotationally driven by a motor (not shown), and a movable table 3b that moves according to the length of the roll, and moves to correspond to the roll length. By inputting the diameter of the coating film forming body R, a rotation speed suitable for the first wiping process, for example, a rotation speed of 0.5 m / s is calculated and rotated at the rotation speed. Thus, the next printing process by the ink jet printer is intermittently rotated by another calculation formula.
[0024]
  The coated film forming body R according to this embodiment is a sleeve-type printing roll for gravure printing having a size of 100 φmm × 800 mm to 300 φmm × 2000 mm.
[0025]
  The movable table 3b is moved in such a manner that the movable table 3b is guided by a lateral linear guide 3d provided on the rear wall of the casing 1 and a ball screw 3e provided between the linear guides 3d. A ball nut 3f to be screwed is provided on the movable table 3b, and the ball screw 3e is rotated by a servo motor 3g so that the ball nut 3f becomes a runner.
[0026]
  Then, the apparatus part which wipes the to-be-coated-film formation body R is demonstrated.
  Below the coating film forming body R chucked by the cylindrical chuck rotating means 3, a moving table 5 placed on the rail 4 reciprocates along the coating film forming body R by driving a ball screw. A movable bracket 7 is provided on the elevating table 6 mounted on the movable table 5, and the movable bracket 7 is equipped with a wiping head.
[0027]
  The configuration for raising and lowering the elevating table 6 is such that the elevating table 6 is guided by a vertical linear motion guide 8 provided on the movable table 5, and a ball screw (not shown) becomes the vertical axis on the movable table 5. And a ball nut (not shown) that is screwed to the ball screw is provided on the lifting table 6, and the ball nut is rotated by a servo motor (not shown) so that the ball nut becomes a runner.
[0028]
  The movable bracket 7 is configured to further move up and down with respect to the lifting table 6 that moves up and down. The movable bracket 7 is moved up and down by guiding a male guide 10 provided on the movable bracket 7 to a female guide 9 provided on the lift table 6, and the lift table 6 and the movable bracket 7 are connected by a cylinder device 11. The movable bracket 7 is moved up and down with respect to the lifting table 6 by the expansion and contraction of the cylinder device 11.
[0029]
  The movable bracket 7 is lifted before the lifting table 6 by the extension operation of the cylinder device 11, and is then chucked by the cylindrical chuck rotating means 3 when the lifting table 6 is lifted and lowered. It has the bay part 7a which receives the to-be-coated-film formation body R.
[0030]
  A proximity sensor 12 is attached to the movable bracket 7 so as to correspond to the central portion of the bay portion 7a. The proximity sensor 12 outputs a detection signal when the gap with the lower surface of the coating film forming body R received in the bay portion 7a becomes, for example, 3 mm. Based on this detection signal, the lifting table 6 Ascends and stops.
[0031]
  Therefore, the movable bracket 7 is configured to greatly increase the stroke of the movable bracket 7 by extension of the cylinder device 11, and then to put the coating film forming body R into the bay portion 7a of the movable bracket 7 regardless of the diameter. A stroke corresponding to the diameter of the coating film forming body R is shared by the lifting table 6 to shorten the operation time and the positioning stroke.
[0032]
  The moving speed of the movable table 5 is changed according to the number of rotations of the coating film forming body R so that the coating film forming body R moves, for example, 8 to 10 mm when the coating film forming body R rotates once.
[0033]
  The wiping head is provided with a pair of guide rolls 14 provided at opposing portions that feed out a tape T of a wiping cloth that is not self-dusting from an original reel 13 attached to the movable bracket 7 and sandwiches the bay 7a of the movable bracket 7. 15 is wound around a take-up bobbin 17 that is rotationally driven by a first torque motor 16 and a braking free roll 21 to which a nip pressure is applied to a guide roll 14 by a cylinder device 20 The tape T is pressed to press the tape T, and the rotation of the guide roll 14 is braked to apply the braking to the feeding of the tape T from the raw fabric reel 13.
[0034]
  The braking free roll 21 has play in the shaft portion and the bearing so as to be separated from the guide roll 14 by 0.5 mm, for example, and the braking free roll 21 is urged by the cylinder device 20 by the extension operation. 21 applies a nip pressure to the guide roll 14.
[0035]
  The cylindrical chuck rotating means 3 rotates the coating film forming body R in the direction opposite to the running direction of the tape T fed out from the original fabric reel 13 so that a load is applied to the first torque motor 16. ing.
[0036]
  The rewinder shaft 18 can be connected to and disconnected from the output shaft of the second torque motor 19 and can be pulled out and removed in the axial direction. The second torque motor 19 is provided so as to rotate in a direction in which the torque is smaller than that of the first torque motor 16 and braking is applied to the feeding of the tape T from the original fabric reel 13.
[0037]
  Since the first torque motor 16 unwinds the tape T from the raw fabric reel 13, the second torque motor 19 creeps in the direction opposite to the direction in which the drive is applied, thereby rotating the tape T. Brake can be given to the feeding.
[0038]
  Therefore, applying the braking to the feeding of the tape T is performed by pressing the guide roll 14 with the braking free roll 21 to which the nip pressure is applied by the cylinder device 20 and the joint action of the second torque motor 19.
[0039]
  The wiping cloth is a cloth made of polyester or polyester and nylon of ultrafine fibers and having no self-dusting property. As a suitable wiping cloth, there is Savina Minimax (registered trademark) of wiping cloth of Kanebo Co., Ltd., which is an ultra-fine fiber of 0.1 denier (thickness of 1 to 5 μm) and is a long fiber. Made of polyester and nylon, the cross section of the yarn is wedge-shaped, dust is taken in, and there is no self-dusting property. In addition, the wiping cloth of Toray Industries, Inc. is a cloth made of ultra-fine filament polyester and has no self-dusting property and is applicable.
[0040]
  The original reel 13 is obtained by winding a wiping cloth tape T around a bobbin, and can be purchased from Kanebo Co., Ltd. or Toray Industries, Inc.
[0041]
  The effect | action by a wiping head is explained in full detail.
  The original fabric reel 13 is attached, and the tape T of the wiping cloth is wound around the free roll 21 for braking and wound around the guide rolls 14 and 15, and the tape feeding end is wound around the take-up bobbin 17.
[0042]
  The cylindrical chuck rotating means 3 chucks the coating film forming body R. Next, the moving table 5 moves to a position corresponding to one end of the coating film forming body R.
[0043]
  The cylinder device 11 is extended to raise the movable bracket 7 with respect to the lift table 6, and then the lift table 6 is lifted, and the coating film forming body R relatively enters the bay portion 7 a of the movable bracket 7. When the gap with the lower surface of the coating film forming body R becomes 3 mm, for example, the proximity sensor 12 outputs a detection signal, and the lifting table 6 is raised and stopped.
[0044]
  The first torque motor 16 and the second torque motor 19 are driven almost simultaneously with the raising of the lifting table 6, the cylinder device 20 is extended, tension is applied to the tape T of the wiping cloth, and tape running starts.
[0045]
  When the elevating table 6 is raised, the coating film forming body R comes into contact with the tape T stretched around the guide rolls 14 and 15 and enters the bay portion 7a of the movable bracket 7 relatively, and the tape T is coated. Runs in sliding contact with the peripheral surface of the film forming body R. The rotation of the coating film forming body R is opposite to the running direction of the tape T. Accordingly, the tape T runs in sliding contact with the rotating coating film forming body R without loosening the tension, and starts wiping off dirt and oils adhering to the coating film forming body R.
[0046]
  The raising / lowering table 6 stops ascending, and after several seconds, the moving table 5 moves from a position corresponding to one end of the coating film forming body R to a position corresponding to the other end. Accordingly, wiping with the tape T of the wiping cloth is performed from one end to the other end of the coating film forming body R.
[0047]
  Next, after the lifting table 6 is lowered and returned, the cylinder device 11 is reduced, the movable bracket 7 is lowered with respect to the lifting table 6, and the tape T stretched around the guide rolls 14 and 15 is coated with the coating film forming body R. The first torque motor 16 and the second torque motor 19 stop driving when they return to the horizontally stretched state, the cylinder device 20 is reduced, the tape travel stops, and the movable platform 5 Return to the original position.
[0048]
  Next, the printer portion that prints the entire surface coating film, negative mask, or positive mask by ejecting the coating film forming ink from each inkjet nozzle to the coating film forming body R or stopping the ejection will be described.
[0049]
  On the upper side of the coating film forming body R chucked by the cylindrical chuck rotating means 3, a printer head 22 having an inkjet nozzle 22a facing the coating film forming body R is provided.
[0050]
  The lifting drive means is configured such that a ball screw provided on the carriage 23 and a ball nut fixed to the lifting table 24 are screwed together, and when the ball screw is driven by the servo motor 29, the ball nut becomes a runner. Is done.
[0051]
  The reciprocating movement of the printer head 22 along the coating film forming body R is performed by the reciprocating table 23 being reciprocated by the reciprocating driving means.
[0052]
  The reciprocating driving means includes a ball screw 27 that is engaged and guided by a linear guide 26 mounted on the rear wall of the casing 1 and a ball screw 27 that is pivotally supported on the rear wall of the casing 1 and a ball that is fixed to the lifting table 24. When the ball screw 27 is driven by the servo motor 28 while the nut is screwed, the ball nut becomes a runner.
[0053]
  The printer head 22 has a large number of inkjet nozzles 22 a arranged at a predetermined pitch in the circumferential direction of the coating film forming body R. The ink jet nozzle 22a moves close to one end of the rotated film-forming body R and ejects ink that is insoluble in the etching solution.
[0054]
  The approach / separation movement of the printer head 22 with respect to the coating film forming body R is performed by raising / lowering the elevation table 24 supporting the printer head 22 via the bracket 25 by the elevation drive means provided in the carriage 23. Done.
[0055]
  When the ink jet nozzle 22a is in close proximity to the coating film forming body R and ejects the coating film forming ink from each of them, a related pitch that can form a unit coating line with a constant width overlapping in the circumferential direction of the coating film forming body R. It is arranged. These ink jet nozzles 22a perform ink ejection based on a digital data signal assigned to each unit line of image data of an entire color coating film or negative mask or positive mask designed and color-coded on the computer screen. It has become.
[0056]
  As a specific example, 64 nozzles capable of performing circular coating with a diameter of 120 μm from one nozzle are arranged at a pitch of 100 μm in a direction perpendicular to the axial direction of the coating film forming body R, and the unit coating line is 6.42 mm. A printer head can be used.
[0057]
  The printer head 22 is close to one end of the rotated film-forming body R, scans the printer head in the axial direction of the film-forming object, and prints the entire coating film, negative mask, or positive mask image data from each inkjet nozzle. Based on the digital data signal assigned to each unit line segment, the film forming ink is ejected or ejection is stopped.
[0058]
  As described above, every time a raster scan print is completed, the output pulse of the rotary encoder 30 is intermittently rotated so as to count by N, and a coating film is formed from each inkjet nozzle in the same manner as described above. Repeat the required number of times to eject ink or stop ejecting.
[0059]
  When the overlap of the one raster scan print and the next one raster scan print matches the one-pitch dimension of the nozzle, the overlap portion is also uniform.PrintIs done. For this purpose, a rotary encoder 30 attached to a drive spindle that rotates integrally with the coating film forming body R as a control amount for intermittently rotating the coating film forming body R is provided, and the output of the rotary encoder 30 is provided. Count pulses by N (= A × B × P / πD).
[0060]
  Specifically, when the coating film forming body R is chucked, the diameter D of the coating film forming body is input to a computer (not shown), and assigned to rotate the coating film forming body R one intermittently by the computer. The number N of output pulses of the rotary encoder 30 is calculated.
(In the above formula, A is the total number of output pulses per rotation of the rotary encoder attached to the drive spindle that rotates integrally with the coating film forming body R, B is the number of nozzles, and P is the arrangement pitch of the inkjet nozzles. is there)
[0061]
  The above formula is (number of output pulses N of the rotary encoder corresponding to the center angle occupied by the unit coating line): (total number of output pulses A per rotation of the rotary encoder A) = (unit coating line = number of nozzles × nozzle arrangement) Pitch = B × P): Derived from the expression of the ratio of the circumferential length πD) of the coating film forming body R.
[0062]
  For example, if a rotary encoder capable of outputting 1000 pulses per angle and 360,000 pulses at 360 degrees is employed, A becomes 360,000 and is stored as a fixed value in the computer. 64 nozzles capable of circular application with a diameter of 120 μm from one nozzle are arranged in a direction perpendicular to the axial direction of the coating film forming body R, the arrangement pitch is 100 μm, and the unit coating line is 6.42 mm. When B is 64, B is 64 and P is 100, which are stored as fixed values in the computer.
[0063]
  Then, when the diameter of the coating film forming body R is 100 mm, D is input and stored in the computer as 100000 in order to match the unit in the above formula. When the diameter is 200 mm, D is input to the computer as 200000 and stored. N is rounded off to the first decimal place.
[0064]
  Therefore, N = 734 pulses when the diameter of the coating film forming body R is 100 mm, and N = 367 pulses when the diameter is 200 mm.
[0065]
  Each time a raster scan print is completed, the output pulse of the rotary encoder is counted by N, and the coating film forming body R is intermittently rotated and stopped. The ejection of the film-forming ink or the stop of the ejection is repeated as many times as necessary. In this case, the carriage 23 is moved by driving the servo motor 28, the printer head 22 is moved from the position corresponding to one end of the coating film forming body R to the other end and stopped, and the coating film forming body R is intermittently rotated. When the output pulse of the rotary encoder 30 is counted by N and the coating film forming body R stops intermittent rotation, the carriage 23 is moved in the opposite direction by the drive of the servo motor 28, and the printer head 22 performs the next printing. .
[0066]
  Thus, the entire surface coating film, negative mask or positive mask can be printed on the coating film forming body by the raster scanning method.
[0067]
  When performing endless printing, the overlap of ink in the first raster scan print and the last raster scan print is an odd number because the number of intermittent rotation feed pulses is smaller than that in standard feed. Is adjusted to be slightly less, and endless processing is performed.
[0068]
  It should be noted that printing in both forward and backward movements of the printer head 22 and printing only in the forward movement are merely differences in software. Printing in both forward and backward movements is preferable because time can be shortened.
[0069]
  When printing of the entire surface coating film, negative mask, or positive mask is completed, the lifting table 24 is raised and returned by driving the servo motor 29, and the ink jet nozzle 22a is separated from the coating film forming body R. Next, the carriage 23 is moved back by driving the servo motor 28, the printer head 22 is returned to the standby position, and the carriage 23 is stopped.
[0070]
  In this embodiment, since wiping with a wiping cloth is performed, ink is ejected to draw plate information, so no pinholes are generated.
[0071]
  When the printer device is applied to gravure plate making, the plate-making roll for gravure printing is chucked at both ends by the cylindrical chuck rotating means 3, and ink having corrosion resistance against the corrosive liquid corroding the thick copper sulfate plating is obtained. The ink tank of the stored cartridge is set, and a negative mask is drawn on the plate-making roll by the ink jet nozzle 22a.
[0072]
  Gravure plate making is completed by performing etching on a plate making roll on which a negative mask is depicted, removing the resist, and performing chrome plating.
  When applied to the photosensitive film coating, the entire surface is applied.
[0073]
  When the printer device is applied to flexographic plate making, a sleeve or roll whose outer layer portion is made of an ultraviolet photosensitive flexo material is chucked on both ends of the cylindrical chuck rotating means 3, and ink having ultraviolet light shielding properties is obtained. The ink tank of the stored cartridge is set, and the negative mask is drawn by the ink jet nozzle 22a on the flexographic surface.
[0074]
  The flexographic plate making is completed by irradiating the flexo surface on which the negative mask is drawn with ultraviolet rays, then developing and removing the negative mask, and further engraving the portion covered by the negative mask.
[0075]
  On the other hand, the present invention is also applied to a system in which a positive mask is drawn with a water-based ink containing carbon black and the entire surface is irradiated with infrared rays to thermally insolubilize the flexo material in the positive mask portion and then developed.
[0076]
  It is also applicable to a method in which the entire surface is coated with a water-based ink containing carbon black, laser ablated with infrared rays, the negative mask is left, and the entire surface is irradiated with ultraviolet rays and then developed.
[0077]
  When the printer device is applied to endless offset plate-making, the cylindrical chuck rotating means 3 has a sleeve or roll having a hydrophilic surface chucked at both ends, and a cartridge in which ink having lipophilicity or oil sensitivity is stored. An ink tank is set, and positive information on the oil having lipophilicity or oil-sensitivity is drawn on the flexographic surface by the ink jet nozzle 22a to be used as an ink application portion. The endless offset plate is set in an offset printing machine, dampening water is adhered to the hydrophilic surface, and printing is performed with ink adhering to an ink-applied portion made of oleophilic or oil-sensitive ink.
[0078]
  When the printer device is applied to rotary screen plate making, the cylindrical tank rotating means 3 is set with an ink tank of a cartridge in which stainless steel rolls are chucked at both ends and ink having resistance to a nickel plating bath is stored. A positive mask is drawn on the roll surface by the ink jet nozzle 22a.
[0079]
  In rotary screen plate making, a stainless steel roll with a positive mask is immersed in a nickel plating bath in a nickel plating tank and rotated to apply a very thick nickel plating to the stainless steel roll. Then, the nickel sleeve is peeled off as a nickel sleeve from the stainless steel roll, and the nickel sleeve with a positive plate information hole is immersed in a chrome plating bath in the tank of the chrome plating machine, rotated and chrome plated, and the sleeve holding material is fixed to both ends. Complete.
[0080]
  Even if the diameter of the coated film forming body R is variously different, the peripheral speed of the coated film forming body R chucked by the cylindrical chuck rotating means 3 at both the line formation speed of the ink jetted from the ink jet nozzle 22a. Adjust. Further, in response to the different rotation speeds due to the different diameters of the coating film forming body R, the moving speed of the ink jet nozzle 22a along the coating film forming body R is varied to form the coating film. Even if the diameter of the body R is different, the overlap of the pixels is the same.
[0081]
【The invention's effect】
  BookAccording to the invention, a coating film-forming ink is printed on a cylindrical film-forming body from an inkjet nozzle of a printer head, and a full-surface coating film, a negative mask, or a positive mask is printed by a raster scan method. The output of the rotary encoder attached to the drive spindle that rotates integrally with the coating film forming body that is assigned to the computer to input the diameter D of the coating film forming body to the computer and rotate the coating film forming body intermittently by the computer. The number of pulses N is calculated and calculated based on the required formula, and even if the diameter of the coating film forming body is large or small, the intermittent rotation feed is controlled with high precision and the unit coating lines of a certain width overlap each other. Can be precisely matched to the overlap between the nozzles, and the whole surface coating, negative mask or positive mask can be printed well Applying photosensitive film coating, gravure printing, flexographic printing, on-demand offset printing, and rotary screen printing to production, it can be formed quickly and easily, ensuring high reliability for plate making, while This eliminates steps such as the photosensitive film coating and development steps, leading to a significant reduction in plate making time and a significant reduction in plate making line space.
[0082]
  In addition, bookAccording to the invention, the dirt and oils adhering to the coating film forming body are wiped with a wiping cloth against the cylindrical coating film forming body, and then the cylindrical coating film forming body is cleaned. Since the coating film forming ink is printed from the inkjet nozzle of the printer head and the entire surface coating film, negative mask or positive mask is printed by the raster scan method, the coating film forming ink can be reliably applied to the coating film forming body. It is possible to avoid the occurrence of pinholes, that is, points where the ink is not applied to the portion where the ink is to be applied with a very high probability, and it is possible to form good pixels on the coating film forming body, and the diameters are variously different. Applying photosensitive film coating, gravure plate, flexographic plate, on-demand offset plate, and rotary screen plate to the production of the coated film, The mask or ink application part can be formed very well quickly and easily, ensuring high reliability for plate making, and on the other hand, steps such as the conventional photosensitive film coating and development steps can be omitted, so the plate making time is greatly increased. This leads to shortening and a significant reduction in the plate making line space.
[Brief description of the drawings]
FIG. 1 is a front view of an ink jet printer apparatus for plate making according to the present invention.
FIG. 2 is an enlarged side view of a main part before starting the operation of the wiping head.
FIG. 3 is an enlarged side view of a main part during the operation of the wiping head.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Casing, 1a ... Roll-in / out opening, 1b ... Roll-in / out opening, 2 ... Roll-in / out door, 3 ... Cylindrical chuck rotation means, 3a ... Drive side chuck 3b ... movable table, 3c ... tail chuck, R ... coated film forming body, 3d ... linear motion guide, 3e ... ball screw, 3f ... ball nut, 3g ...・ Movable table, 4 ... rail, 5 ... moving table, 6 ... elevating table, 7 ... movable bracket, 7a ... bay, 8 ... linear motion guide, 9 ... Female guide, 10 ... Male guide, 11 ... Cylinder device, 12 ... Proximity sensor, 13 ... Original fabric reel, T ... Tape for wiping cloth, 14, 15 ... Guide roll, 16 ... first torque motor, 17 ... winding Bobbin, 18 ... rewinder shaft, 19 ... second torque motor, 20 ... cylinder device, 21 ... free roll for braking, 22 ... printer head, 22a ... inkjet nozzle, 23・ ・ ・ A carriage, 24 ・ ・ ・ Elevating table, 25 ・ ・ ・ Bracket, 26 ・ ・ ・ Linear guide, 27 ・ ・ ・ Ball screw, 28 ・ ・ ・ Servo motor, 29 ・ ・ ・ Servo motor, 30 ・..Rotary encoder.

Claims (1)

A step of chucking both ends of a cylindrical coating film forming body by a cylindrical chuck rotating means having a rotary encoder on a spindle;
A tape of a wiping cloth that is not self-dusting is unwound from an original reel and is slidably contacted with one end of the film-forming body that is rotated to wind up and adhere to the film-forming body with the tape. A wiping head for wiping away dirt and oil that has been removed is provided on the lower side of the coating film forming body, and is raised corresponding to one end of the lower surface of the rotated coating film forming body so as to slide on the tape. The process of moving to the other end and wiping off dirt and oil that adheres to the coating film forming body with the tape,
The output pulse number N of the rotary encoder assigned in order to one intermittently rotating the target film-forming material to enter the diameter D of the Hinurimaku forming body to the computer with a computer (N = A × B × P / πD) A step of calculating from the formula of
(In the above equation, A is the total number of output pulses per rotation of the rotary encoder, B is the number of inkjet nozzles, and P is the arrangement pitch of inkjet nozzles . )
A printer head having a large number of inkjet nozzles that are arranged at a predetermined pitch in the circumferential direction of the coating film forming body and that form a unit coating line with a constant width by overlapping the film forming ink in a chained manner in the circumferential direction. the close proximity to one end of Hinurimaku forming body, each unit coating line of the image data of the entire coating film or a negative mask or positive mask from each of the ink jet nozzle while scanning the print head in the axial direction of the Hinurimaku forming body a step of resting the injection or injection a coating film forming ink on the basis of the digital data signals allocated to the minute,
Including
Each time a single raster scan of printing ends, the intermittently rotated to count only before Symbol N output pulses of the rotary encoder is stopped, the film-forming ink from each of the ink jet nozzles in the same manner as described above Repeat as many times as necessary to stop or stop spraying,
Thus, a method for forming a coating film on a cylindrical coating film by an ink jet printer, comprising printing an entire coating film, a negative mask, or a positive mask on the coating film forming body by a raster scanning method.

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