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EP0295606B1 - Automatische Farbzuführung in einer Rotationsoffsetandruckpresse - Google Patents

Automatische Farbzuführung in einer Rotationsoffsetandruckpresse Download PDF

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Publication number
EP0295606B1
EP0295606B1 EP88109377A EP88109377A EP0295606B1 EP 0295606 B1 EP0295606 B1 EP 0295606B1 EP 88109377 A EP88109377 A EP 88109377A EP 88109377 A EP88109377 A EP 88109377A EP 0295606 B1 EP0295606 B1 EP 0295606B1
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EP
European Patent Office
Prior art keywords
density
ink
feeding
printing
patches
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88109377A
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English (en)
French (fr)
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EP0295606A2 (de
EP0295606A3 (en
Inventor
Osamu C/O Dainippon Screen Mfg. Co. Ltd. Oda
Masaji C/O Dainippon Screen Mfg. Co. Ltd. Mizuta
Shuji Dainippon Screen Mfg. Co. Ltd. Tsuchimoto
Hideharu Dainippon Screen Mfg. Co. Ltd. Okuda
Masahiro Dainippon Screen Mfg. Co. Ltd. Nakajima
Kenji C/O Dainippon Screen Mfg. Co. Ltd. Sumi
Tomoyuki Dainippon Screen Mfg. Co. Ltd. Kadota
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dainippon Screen Manufacturing Co Ltd
Original Assignee
Dainippon Screen Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP12907387A external-priority patent/JPS63295429A/ja
Priority claimed from JP13212887A external-priority patent/JPS63296490A/ja
Priority claimed from JP62148373A external-priority patent/JPS63312146A/ja
Priority claimed from JP21112487A external-priority patent/JPS6453845A/ja
Priority claimed from JP12907387U external-priority patent/JPS6434235U/ja
Priority claimed from JP13212887U external-priority patent/JPS6436139U/ja
Application filed by Dainippon Screen Manufacturing Co Ltd filed Critical Dainippon Screen Manufacturing Co Ltd
Publication of EP0295606A2 publication Critical patent/EP0295606A2/de
Publication of EP0295606A3 publication Critical patent/EP0295606A3/en
Publication of EP0295606B1 publication Critical patent/EP0295606B1/de
Application granted granted Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/08—Ducts, containers, supply or metering devices with ink ejecting means, e.g. pumps, nozzles

Definitions

  • the present invention relates to an automatic ink feeding apparatus in an offset proof press machine according to the preamble part of claim 1 and to an ink feeding method in an offset proof press machine according to the preamble part of claim 9.
  • Fig. 1 schematically illustrates a generally accepted flatbed proof press machine.
  • a plate bed 4 and a printing bed 6 approximately on the central portion of a frame 2, respectively.
  • a damping unit 8 for supplying a damping water
  • an inking unit 10 At an upper surface of the frame 2, there is mounted a carriage 12 which is capable of reciprocating between the two ends of the frame 2.
  • a blanket cylinder 14 In the carriage 12, there are rotatably supported a blanket cylinder 14 having its outer peripheral surface covered with a blanket such as rubber, damping rollers 16, and inking rollers 18, respectively.
  • the inking unit 10 is assembled of a plurality of inking rollers 20 which are rotated and swung by a driving device such as a motor not illustrated, and adapted to feed ink to the rollers 18 and to knead fed ink.
  • Reference numeral 22 designates a cover for the inking rollers 18 made of a transparent material.
  • the carriage 12 reciprocatorily travels on the frame 2 after a printing plate and a printing paper are mounted on the plate bed 4 and the printing bed 6, respectively. Specifically, when the carriage 12 is positioned at the right end side of the frame 2 in fig. 1, oily ink is fed to the inking rollers 18 from the inking rollers 20 of the inking unit 10. As the carriage 12 horizontally runs toward the left side of the frame 2 in Fig.
  • the damping rollers 16 supply damping water to hydrophilic non-image formation portions of the surface of the printing plate while making rotational contact with the surface of the printing plate in the first place, and thereafter the inking rollers 18 feed ink to lipophilic image-formed portions thereof while having rotational contact with the surface of the printing plate, until the carriage 12 reaches the left end side of the frame 2 in Fig. 1. If desired, the damping rollers 16 receive damping water from the damping unit 8 at the left end side of the frame 2.
  • the inking rollers 18 further furnish the ink to the lipophilic image-formed portions while again having rotational contact with the surface of the printing plate, and thereafter the blanket cylinder 14 makes rotational contact with the surface of the printing plate so that ink thus applied solely to image-formed portions of the surface of the printing plate is transferred to the outer peripheral surface of the blanket cylinder 14.
  • the damping rollers 16 further supply damping water to the non-image-formed portions of the surface of the printing plate while having rotational contact with the surface of the printing plate once more.
  • the blanket cylinder 14 makes rotational contact with the printing paper on the printing bed 6 in order to transfer the inked image to the printing paper, thus accomplishing an offset printing.
  • the carriage 12 is restored to the right end of the frame 2 in Fig. 1, one press proofing operation is completed.
  • the aforementioned proofing is intended to check the conditions and quality of the plate-making prior to the running-on of a printing press and also to obtain a standard printing for use in the production run of the press.
  • a main factor that determines the final quality of the proof is a control of ink feeding amount to the inking rollers.
  • the operator has manually applied ink in the required amount to the inking rollers on the basis of his experience utilizing an ink knife. Specifically, the operator produces two or three sheets of printings after application of the amount of ink with the ink knife. Then, viewing the conditions of the produced printings he judges the ink amount of correction needed totally and/or locally of the inking rollers based on his trained experience, so that he manually replenishes ink in the judged amount with the ink knife to those portions of the inking rollers along the axial direction thereof which appear deficient in ink.
  • Japanese Patent Application Kokai No.58-201008 discloses a proposal that the feeding amount of ink from an ink doctor is determined on the basis of the measurement of the ratio of the image area on the plate surface of the printing plate. Specifically, according to this proposal, the feeding amount of ink is set by estimating a consuming amount thereof based on the measuring of that ratio of the image area at the outset. Then, dozens of printings are produced until the density of the produced printings and the feeding amount of ink seem to be substantially equilibrated with each other, and thereafter the density of printings is checked, so that the feeding amount is adjusted again upon consideration of the checked density. Subsequently, after dozens of printings are further made, the density of the printings is examined again, so that the feeding amount is adjusted once more. Thus, the above procedure is repeated until the feeding amount is completely equilibrated with the desired printing density.
  • Japanese Patent Application Kokai Nos.60-151051 and 60-214960 disclose a technique wherein there is provided a printing control data detection unit on the carriage of the proof press for measuring printing control scales printed on the printing paper together with the image, and the so obtained data is utilized for the quality control of the printings produced by the press proofing.
  • the document DE-A 27 28 738 discloses a device for controlling the ink printing, wherein a plurality of ink dosing elements are provided which are arranged along the width of the printing plate which are independently adjustable.
  • a control data detection unit is provided, comprising density measuring means scanning a number of control fields on the matter to be inked and a network of microcomputers as operation means.
  • This network of microcomputers is adapted to optimize the programs for calculating the position of the ink dosing elements, for controlling the density measuring means and for controlling the ink dosing elements.
  • the computer network which is required for this device is complicated in that too many components of the device have to be controlled.
  • the invention as claimed is intended to remedy the aforementioned drawbacks, and the problem underlying the invention is to enable the accurate control of the feeding amount of ink to the inking rollers to be always executed without the operator's skillfulness in the offset proof press machine which encounters with the difficulties that the number of printings required to be produced is small and that the replacement of the printing plates is frequently conducted and further great variances of printing conditions take place. Further, apparatus and method should simplify the ink printing control.
  • the advantage offered by the invention is mainly that there is attained accurate and continual control of the feeding amount of ink to the inking rollers without the operator's skillfulness in the offset proof press machine, which leads to the accomplishment of the stable and improved quality of the produced printings.
  • the main factor that determines the final quality of the proof is the control of the feeding amount of ink to the inking rollers.
  • the provision of the ink feeding apparatus that is capable of supplying ink to the inking rollers with high precision is prerequisite for that control.
  • ink feeding apparatus As a first requirement of such ink feeding apparatus, it is pointed out to invariably control of the ink feeding amount regardless of the viscosity of ink being employed.
  • the viscosity of ink differs in the type of ink being employed, and further greatly affected by the ambient temperature. Accordingly, it is neccessary to adjust the ink feeding amount every time a different type of ink is employed and the temperature varies if the ink feeding amount varies with the change of the viscosity of ink, which would otherwise lead to the excess or deficiency of the feeding amount of ink so as to disable the stable maintainance of the ink feeding amount.
  • a second requirement is to effect the accurate control of feeding ink in a fine amount.
  • each division having a length of, for example, 30-40 mm, which inking rollers are disposed along the direction intersecting at right angles with the direction in which the carriage travels, and hence the feeding amount of ink to each division will be extremely small.
  • a third requirement is a short cycle of feeding ink by the subject ink feeding apparatus. Where such axial numerous small divisions are set and the ink feeding amount is determined per division, the ink feeding operation is repeated for each division over the entire lengths of the inking rollers. Accordingly, when the ink feeding cycle of the device is long, it takes a long time to complete feeding ink to the inking rollers, and thus, the time required for one press proofing is also long. Consequently, for example, the amount of the damping water varies, thereby adversely affecting the printing quality.
  • a fourth requirement is to enable an employment of any type of ink, since different kinds of ink manufactured by a variety of makers are utilized in the offset press proofing, and further cases frequently occur in which ink in a special color is prepared by admixing ink in two different colors or more and, varnish, compounds and the like are added.
  • a fifth requirement is to accomplish the control of feeding amount of ink with the precision that is hard to be affected to bubbles mixed into ink.
  • Ink for use in press proofing is usually kneaded on a lithographic plate etc. by the ink knife to improve its fluidity after taken from an ink cam, and admixed to two or more kinds of ink if desired for the printing, and kneaded to mix thereto varnish or compounds for the purpose of altering its property such as viscosity.
  • mingling of the bubbles into ink is unavoidable.
  • the small sized ink doctor system has drawbacks that feeding ink in the minute amount is hard to control and that the feeding apparatus is complicated in construction.
  • the present invention as claimed is also intended to remedy the above drawbacks, and the problems underlying the invention is to achieve the above whole requirements.
  • the problem is solved, according to a preferred embodiment, by providing an ink feeding pump device in an offset proof press machine, said pump device comprising an ink tank part for accommodating therein ink to which pressure is always applied by pressure means, wherein a piston rod is provided which is driven to push out ink in a feeding passage by a driving part, and there is provided a valve part for closing an opening end of said feeding passage.
  • the further advantage offered by the invention is that upon the ink feeding pump device in the offset press proof machine is bestowed simple construction, small size, light weight, excellence in washability, and also in separation so as to be free of dangling.
  • ink is replenished to ink rollers upon the judgment that printing density is low as compared with the desired one by the analysis of a first sheet of produced printing
  • the printing density will not rise to a desired degree in the case of a second sheet of printing produced subsequently to the first sheet of printing.
  • the printing density will reach its maximum after two or three sheets of printings are produced following such replenishment of ink, and will thereafter decrease.
  • the reason for this phenomenon is inferred to be that supplied ink is successively transferred many times, i.e. from the ink rollers to the printing plate, from the printing plate to the blanket, and from the blanket to the printing paper in the press proofing.
  • the printing density when the printing density is lower than the target density to a large degree, the printing density will not immediately increase after ink is replenished, and, if there is accordingly repeated such replenishing ink in the amounts decided from the density of respective printings sequentially produced in the press proofing operations repeatedly conducted until the target density is reached, then the excessive quantity of ink will have been supplied to the inking rollers at the time the target density is attained. Therefore, even if the ink feeding is stopped at that time, the printing density will continue to rise up far beyond the target density, and at last begin to decline after reaching its maximum value.
  • the printing density will abruptly decrease every time one sheet of printing is produced. Even if ink is replenished at a time the printing density becomes lower than the target density, the printing density will not immediately increase but still keep decreasing. The printing density will start rising in the end after its minimum value is reached.
  • the invention as claimed is also intended to remedy the above drawbacks.
  • the problem underlying the invention is to attain the accurate control of the feeding amount of ink to the inking rollers to be always executed without the operator's skillfulness in the offset proof press which encounters with difficulties that the number of printings required to be produced is small and that the replacement of the printing plates is frequently conducted and further that great variances of printing conditions take place.
  • the still further problem is to promptly and stably approximating the printing density to the target density where there exists a large gap therebetween, at the start of proofing, or because of the environmental variances of conditions such as those of damping water and air-conditioning.
  • an automatic ink feeding apparatus wherein a memory stores data concerning density of said patches on at least a latest produced sheet of printing, and said operation means judges whether or not said density of said patches is within a preset density range and finds a density variation between said density and said stored density of said patches of a precedingly produced sheet of said patches in the case where said density is within said preset density range, so as to make a comparison of said density variation with a preset density variation, and said control means enables or disables said ink feeding means to feed required amounts of ink to said axial positions of said inking rollers corresponding to said patches, respectively, on the basis of said comparison.
  • the problems are also solved by providing an ink feeding method, wherein said density of said patches is detected after every sheet of printings is produced, and said density of said patches of at least a latest produced sheet of printing is stored, and in the case where said density is lower than said target density, feeding ink in said required amounts is exclusively disabled on condition that said density is within a preset density range and at the same time that a density increase variation between said density and said stored density of said patches on a precedingly produced sheet of printing is larger than a preset variation, whereas, in the case where said density is higher than said target density, said feeding ink in said required amounts is exclusively enabled on condition that density is within a preset density range and at the same time that a density decrease variation between said density and said stored density is larger than said preset variation.
  • the invention is further intended to remedy these drawbacks.
  • the yet further problems underlying the invention are to promptly approximate the printing density to the target density with the small number of printings consumed therefor and to effect the stable density control once the target density is approximately reached, even in the case where those portions of the plate surface which have large image areas in the direction intersecting at right angles with the printing direction temporarily render extremely low the density of the printing being produced when the initial proofing is performed or at a time the proofing is started after the repacement of the printing plates.
  • the problems are also solved by providing an ink feeding method, wherein in the case where said detected density is lower than said target density, there are made comparisons of said density with at least two different prescribed densities, and said required amounts of ink is fed to said predetermined axial positions of said inking rollers in such a staged manner as determined according to said comparisons.
  • the advantages offered by the invention are that there is accomplished prompt approximation of the printing density to the target density with the small number of printings consumed therefor and to effect the stable density control once the target density is approximately reached, even in the case where those portions of the plate surface which have large image areas in the direction intersecting at right angles with the printing direction temporarily render extremely low the density of the printing being produced when the initial proofing is performed or at a time the proofing is started after the repacement of the printing plates.
  • Figure 1 is a schematic view illustrating one of the generally accepted flatbed proof press machines described above;
  • Figure 2 is a block diagram depicting an arrangement of an automatic ink feeding apparatus according to an embodiment of the present invention;
  • Figure 3 is a plan view partially showing the flatbed offset proof press machine incorporating the feeding apparatus of the invention;
  • Figure 4 is a front view illustrating an example of a measuring head 42 of a printing density measuring unit 24 of the apparatus;
  • Figure 5 is a view explaning the fundamental arrangement of the head 42;
  • Figure 6 is a perspective view illustrating another printing density measuring unit 50;
  • Figure 7 is a perspective view depicting an example of ink feeding unit 32;
  • Figure 8 is a vertically sectional view illustrating an arrangement of an ink pump 90 of the unit 32;
  • Figures 9A through 9C are vertically sectional views explaning an operation of the ink pump 90;
  • Figure 10 is a flow chart showing an operation of the feeding apparatus of the invention;
  • Figure 11 is a vertically
  • Fig. 2 is a block diagram illustrating an arrangement of an automatic ink supplying apparatus according to a first embodiment of the invention, which is applied to, for example, the offset proof press machine as shown in Fig. 1.
  • the apparatus is generally constituted by a printing density measuring unit 24, a printing density displaying and recording unit 26, printing density judging and ink supply amount setting unit 28, a target density inputting member 30, an ink feeding unit 32, and a control circuitry 34.
  • the printing density measuring unit 24 is designed to measure the density of a plurality of density control patches that have been impressed on a blank or margin of an image on a printing paper by an offset press proofing process. Such measuring takes place, for example, every time the execution of the press proofing for one sheet of printing paper is completed.
  • the unit 24 is mounted on one edge of the carriage 12 so as to move above the frame 2 together therewith, as illustrated in Fig. 3 which is a plan view partially depicting a flat bed offset proof press machine.
  • the printing paper designated by reference numeral 36 is set on a printing bed 6.
  • the image 38 is transferred on the printing paper 36 from the printing plate and also the desity control patches 40 are transferred therefrom onto the margin or blank on the paper 36.
  • the density control patches 40 are printed in a row at regular intervals, for example, at a pitch of 40mm, in a direction 48 intersecting at a right angle with a direction in which the carriage 12 runs to perfom a pressing operation, as shown in Fig. 3.
  • Figs. 4 and 5 illustrate an example of a measuring head 42 of the printing density measuring unit 24.
  • the measuring head 42 is adapted such that a light source 44 and photodetectors 46 are disposed in a fixed positional relationship with each other, as depicted in Fig. 5.
  • the photodetectors 46 are divided into numerous units each of which consists of, for example, a cyan density measuring photodetector c, a magenta density measuring photodetector m, a black density measuring photodetector k, and a yellow density measuring photodetector y.
  • the photodetectors 46 are so provided in a large number at a pitch corresponding to that of the transferred patches 40, for example, at a pitch of 10mm, that the photodetectors 46 are capable of measuring the whole printed density of the density control patches 40.
  • the measuring head 42 is supported by the carriage 12 in a manner to be movable in the direction 48 in order that the respective photodetectors 46 exactly confront the printed positions of the density control patches 40 by adjustment.
  • the construction of the printing density measuring unit 12 is not limited to that as aforementioned and may be appropriately modified insofar as is met a requirement that there is measured the whole printing density of the density control patches 40 printed over the entire width of the printing paper 36.
  • it may be arranged that only one unit of the photodetectors is provided on the carriage and that the photodetectors successively measure the density of a plurality of the density control patches while being moved in the direction intersecting the travelling direction of the carriage, according to the technique conventionally known to the art.
  • the printing density measuring unit is not necessarily confined to the above type which is equipped with the carriage to perform the measuring of the density of the patches during the carriage is moved.
  • a printing density measuring unit 54 As the measuring unit may be applied a separate installation type of a printing density measuring unit 54 as depicted in Fig. 6, in which the printing paper 36 is released from the printing bed and placed at a predetermined position on an upper surface of a table 52 and the density control patches 40 that have been transferred on the paper 36 along with the image 38 are then scanned by a scanning head 54 to measure the printing density thereof, every time the offset proof press machine completes one offset press proofing operation.
  • reference numeral 56 denotes a data inputting member, 58 a display member, and 60 a recording member such as a printer.
  • the printing density displaying and recording unit 26 is provided for displaying and recording the measured density data obtained by the printing density measuring unit 24.
  • the printing density judging and ink feeding amount setting unit 28 is provided with an operational circuit that compares the printing density of the respective printing density control patches 40 measured by the measuring unit 24 and target density set in advance therefor and that calculates the neccessary amounts of ink to be fed to the respective predetermined axial positions on the inking rollers 18.
  • the provision of the target printing density inputting unit 30 is intended to input discrete target density data concerning respective coloring ink materials to a random access memory (RAM) of the printing density judging and ink feeding amount setting unit 28.
  • RAM random access memory
  • the kinds of the coloring ink materials to be employed are freely chosen according to the printings required. Therefore just one coloring material may be employed.
  • levels of the target density of the patches 40 to be inputted to the unit 28 are the same in regard to the same coloring material.
  • the unit 30 is, for example, a keyboard. Alternatively, such unit 30 may be omitted where the target density data are beforehand inputted to a read only memory (ROM) of the unit 28.
  • the ink feeding unit 32 fulfills the function of feeding a required amount of ink to the inking rollers 18 while reciprocating along the axial direction of the rollers 18.
  • Fig. 7 illustrates an example of the construction of the ink feeding unit 32.
  • the unit 32 is assembled of an ink feeding part 62, a supporting block 64 to which the part 62 is fixed, a screw bar 66 inserted through and screwed on the block 64 and rotatably supported at both ends thereof by a pair of a securing boards 68, a pair of guide bars 70 idlely or freely inserted through the block 64 and also held at both ends thereof by the boards 68, a motor 72 fixed on the one board 68, pulleys 74 and 76 secured on one end of the screw bar 66 and on a rotation shaft of the motor 72 respectively, and a belt 78 wound on and between the pulleys 74 and 76.
  • reference numeral 80 designates an ink replenishing roller, which is moved between the ink feeding part 62 and the inking rollers 20 by actuating a cylinder 82 to swing a swinging bar 84 linked with a piston bar of the cylinder 82, in order to relay the ink jetted from the part 62 to the rollers 20.
  • ink replenishing roller 80 may be omitted to directly feed the ink to the ink feeding rollers 20.
  • the driving of the ink feeding part 62, the motor 72, and the cylinder 82 are under control of a control circuitry 34.
  • the motor 72 is driven by a motor controlling circuitry 86 shown in Fig. 2.
  • the rotating force of the motor 72 is transmitted to the screw bar 66 through the pulley 76, the belt 78, and the pulley 74 to enable rotation of the bar 66.
  • Such rotation of the bar 66 causes the blocks 64 to be guided by the bars 70 and moved along the axes of the rollers 20.
  • the motor 72 is designed for normal and reverse rotation, and therefore the reciprocating motion of the ink feeding part 62 is effected by normally and reversely rotating the motor 72.
  • An amount of the rotation of the motor 72 is detected by a rotation transducer 73, which yields an output signal representative of the position of the part 62 in the axial direction of the rollers 20.
  • the driving of the ink part 62 is under control of an ink pump control circuitry 88 of the control circuitry 34, so that predetermined axial positions on the rollers 20 (for example positions corresponding to density detection positions of the control patches 40 are supplied with required amounts of ink, respectively.
  • the ink feeding unit may be provided on the ink rollers 18 of the carriage 12 instead of on the inking rollers 20 of the inking device 10.
  • Fig. 8 shows an example of a specific construction of an ink pump 90 which effects the feeding part 62 of the feeding unit 32.
  • secondary compression 96 is always applied to ink 94 accommodated in an ink tank 92, and ink 94 is fed from an ink feeding outlet 102 by actuating the ink pump control circuitry 88 to control an amount of air supply to a double-acting cylinder 98 in order to vertically move a piston 100 thereof.
  • a narrow pipe portion P is filled with ink 94 which has entered thereinto through a communication passage 104 by the application of the secondary compression 94 and at the same time an exit of the portion P is closed by a ball valve 108 urged by a spring 106, when the piston 100 is located at an uppermost position as illustrated in Fig. 8. Then, ink 94 so occupying the space within the portion P is pushed out of the exit of the portion P against the valve 108 and fed from the outlet 102 when the piston 100 is lowered from the uppermost position by actuating the control circuitry 88 to drive the air cylinder 98, as depicted in which the piston 100 has reached a lowermost position.
  • the control circuitry 34 controls the driving of the ink feeding unit 32 on the basis of the ink feeding data found by the printing density judging and ink feeding amount setting unit 28.
  • the plate bed 4 there is mounted a printing plate having undergone an exposure treatment wherein exposures of the image 38 and the printing density control patches 40 are made on a suitable portion of the surface of the printing plate and on a portion to be a blank or margin of the image 38 of the plate, respectively.
  • the positions of the printing density measuring unit 24 and the ink outlet 102 of the ink feeding unit 32 are so adjusted as to properly correspond to the positions of the control patches 40, respectively.
  • initial ink application to the ink feeding rollers 20 is performed by the ink feeding unit 32 which feeds ink to the predetermined individual axial positions of the inking rollers 20 in equal quantities or required quantities suitable for the the size of the image.
  • the density of the patches 40 is measured by the printing density measuring unit 24 at step (a).
  • printing density data A is obtained at step (b).
  • Such data A is displayed and recorded by the printing density displaying and recording unit 26 at step (c), and at the same time sent to the printing density judging and ink feeding amount setting unit 28.
  • the target density data B is beforehand inputted to the unit 28 by the target density value inputting unit 30 at step (d). These two data A and B are compared with each other at step (e). When the printing density is equal to or higher than the target density, a proofing operation of a second sheet of printing paper 36 follows at step (i). Where the printing density is lower than the target density, there is found based upon the comparison of the two data ink feeding data including of the neccessary amount of ink to be fed at step (f).
  • the ink feeding data obtained at step (f) is then delivered to the control circuitry 34.
  • the control circuitry 34 actuates the ink feeding unit 32 at step (g), so that ink in neccessary amounts is fed by the unit 32 to the respective positions of the ink feeding rollers 20 corresponding to the density control patches 40 at step (h).
  • Such ink replenishing of the ink feeding rollers 20 by the ink feeding unit 32 is completed before the carriage 12 returns to the home position in contact with the inking device 10 after the printing density measuring operation is terminated, or while the carriage 12 is kept stationary to stand by a succeeding proofing operation.
  • the ink replenishing may be conducted while the carriage 12 is in reciprocating motion to perform the pressing.
  • the ink kneading on the inking rollers 20 is executed for a predetermined time after the rollers 20 receive replenished ink, and thereafter a next proofing operation is performed at step (i).
  • a piston type pump device for use in printing ink feeding according to another embodiment of the invention, which is applied to, for example, the automatic ink feeding apparatus of the preceding embodiment described above, referring to Figs. 11, 12, and 13A through 13C.
  • Fig. 11 is a vertically sectional view illustrating an example of the pump device
  • Fig. 12 is a section taken along the line of II - II of Fig. 11.
  • the ink feeding pump device is assembled of an ink tank part 278, a pump body 280, and a driving part 282.
  • the ink tank part 278 is constituted by an outer receptacle 284, a lid part 286 for sealing an upper opening of the receptacle 284, and a cassette type inner receptacle 288.
  • Printing ink 94 is accommodated in the inner receptacle 288 which is releasably mounted in the outer receptacle 284.
  • ink replacement is conveniently performed after ink as accommodated in the inner receptacle 288 is extracted from the outer receptacle 284.
  • a drain mouth 292 At the bottom of the receptacle 288, there is formed a drain mouth 292, with which is communicated a liquid passage 294.
  • an air supply opening 296 In the lid part 286 there is formed an air supply opening 296 to which is communicated a compressed air supply source not shown via a pipe 298.
  • a pressure of, for example, 6 kg/cm2 By the compressed air is always applied a pressure of, for example, 6 kg/cm2 to ink 94 within the receptacles.
  • Such unbroken application of pressure to ink 94 accommodated in the ink tank part 278 renders bubbles contained in ink 94 compressed and reduced in volume.
  • reference numeral 300 designates a floating lid, 302 and 306 packings, respectively.
  • the drain mouth 292 is provided at the bottom portion of the ink tank part 278 in this embodiment, the arrangement of the mouth 292 is not limited thereto, and, for example, the mouth 292 may be provided at side portions of the ink tank part 278.
  • the pump body part 280 is assembled of an ink feeding part 308, a valve part 310, and a spouting pipe 312.
  • a feeding passage 314 In the feeding part 308 there extends a feeding passage 314, to whose central portion is communicated an end of the passage 294. From one opening end of the passage 314 is inserted a piston rod 316 into the passage 314.
  • the piston rod 316 is capable of reciprocating such that the front end thereof passes that portion 318 of the feeding passage 314 which is communicated with the passage 294 while keeping liquid-tight contact with the interior surface of the passage 314.
  • the valve part 310 has a room 320 connected with the other opening end of the feeding passage 314.
  • a valve seat 322 with which a ball valve body 324 releasably abuts.
  • a coil spring 326 for urging the ball valve body 324 toward the valve seat 322.
  • the driving part 282 is constituted by a double-acting cylinder 336, a cylinder piston rod 338, a base plate 340 and a spouting amount varying unit 342.
  • a coupling 346 By means of a coupling 346, one end of the rod 338 is detachably linked with a linkage 344 on which the rear end of the piston rod 316.
  • the cylinder piston rod 318 is reciprocated by actuating the control circuitry 88 to control an amount of air supply to the double-acting cylinder 336 in order to reciprocate the piston rod 316 via the linkage 344.
  • the spouting amount varying unit is assembled of two stroke varying plates 348 and 350 different in thickness, coupling members 352 and 354 for the respective plate 348 and 350, and a pair of solenoids 356 and 358.
  • the stroke changing plates 348 and 350 are switched to pivot by the solenoids 356 and 358 through the couplings 352 and 354 so that the plates 338 and 350 are selectively inserted between the base plate 340 and a stopper plate 360 formed at an end of the cylinder piston rod 338.
  • the motion of the cylinder piston rod 338 in the right to left direction in the drawing is controlled at a three-staged stroke by choosing among the modes in which the stopper plate 360 is caused to abut against either of the plates 348 and 350, and in which the plate 360 is rendered to directly abut on the base plate 340 without any of the plates 348 and 350 intervening therebetween.
  • staged control of the right to left motion enables the staged control of the extending positions of the front end of the piston rod 316, depending upon which extending positions is determined the amount of ink to be pushed out by the piston rod 316.
  • the spouting amount changing unit 342 may not be necessarily provided.
  • the driving part 282 thus constructed is run by a driving force sufficiently greater than the viscosity resistance of ink and at such a high speed that ensures the desired short cycle of the ink feeding.
  • the ink pushing pressure of the piston rod 316 of the ink feeding part 308 is arranged to be larger than the pushing pressure of the ball valve body 324 against the valve seat 322 of the valve part 310, i.e. than the urging force of the coil spring 326 applied to the ball valve body 324.
  • the pushing pressure of the ball valve body 324 against the valve seat 322 is designed to be larger than the pressure of feeding downward ink in the ink tank part 278, i.e. than the compressed air pressure applied to ink 94 contained in the tank 278.
  • Described hereunder is an operation of the ink feeding pump device, referring to Fig. 11 and Figs. 13A through 13C.
  • part of ink 94 is caused to occupy whole capacity of the narrow pipe portion P of the passage 314 by the application of the compressed air pressure through the passage 294, which portion P is defined by the communication portion 318 of the passage 314 and that portion of the passages 314 which adjoins the room 320 of the valve part 310.
  • the exit of the portion P is closed by the ball valve body 324 being urged by the spring 326. Then, as illustrated in Fig.
  • part of ink 94 in the fine amount so occupying the space within the portion P is pushed out of the exit of the portion P into the room 320 against the ball valve body 324 to which is applied by the spring 326 the rightward urging force lower than the ink pushing force of the piston rod 316, and spouted from the spouting pipe 312 through the room 320, when the piston rod 316 is pushed leftward, passing the communication portion 318 by actuating the ink pump control circuitry 88 to drive the double-acting air cylinder 336 in order to move leftward the piston rod 316 via the cylinder piston rod 338 and the linkage 344.
  • a prescribed amount of ink is capable of finally being spouted from the spouting pipe 312 with accuracy irrespective of the viscosity of ink employed.
  • Fig. 14 is a block diagram illustrating an arrangement of an automatic ink feeding apparatus according to the current embodiment of the invention, wherein like or corresponding parts are also designated by like reference symbles of the first embodiment.
  • the automatic ink feeding apparatus is generally constituted by the printing density measuring unit 24, a memory 426, the printing density displaying and recording unit 26, a printing density judging and ink feeding amount setting unit 28a, a density data inputting member 30a, the ink feeding unit 32, and the control circuitry 34.
  • the memory 426 is additionally provided for storing therein the density data obtained by the unit 24 concerning the individual density control patches 40 on one sheet of produced printing after sequentially deleting a preceding data for the one sheet of printing.
  • the printing density judging and ink feeding amount setting unit 28a is provided with an operation circuit that compares printing density A′n of the respective patches 40 detected by the unit 24 and the target density set beforehand therefor so as to judge whether or not each of the detected density A′n falls within a density range respectively preset, and that finds a density variation of each density A′n from a density A′n-1 of the corresponding patches 40 of the preceding printing stored in the memory 426 in the case where the density A′n is within the range so as to further judge whether or not the variation is larger than a preset value, and further that calculates the required amount of ink to be replenished to the respective axial predetermined positions of the inking rollers.
  • the density data inputting member 30a is provided to input discrete target density data Do for respective coloring materials, density difference data d, and variation data ⁇ d to a random access memory (RAM) of the printing density judging and ink feeding amount unit 28a.
  • the member 30a is a keyboard, for example, and may be omitted where these data are in advance inputted to a read only memory (ROM) of the unit 28a.
  • the plate bed 4 there is mounted a printing plate having undergone an exposure treatment wherein exposures of the image 38 and the printing density control patches 40 are made on a suitable portion of the surface of the printing plate and on a portion to be a blank or margin of the image 38 of the plate, respectively.
  • the positions of the printing density measuring unit 24 and the ink spouting outlet 102 of the ink feeding unit 32 are so adjusted as to properly correspond to the positions of the control patches 40, respectively.
  • the initial ink application to the inking rollers 20 is performed by the ink feeding unit 32 which feeds ink to the predetermined individual axial positions of the inking rollers 20 in equal quantities or required quantities suitable for the size of the image to be transferred to the printing paper 6 from the printing plate.
  • the density of the patches 40 is measured by the printing density measuring unit 24 at step (a1).
  • the printing density data A′n is obtained at step (b1).
  • Such data A′n is displayed and recorded by the printing density displaying and recording unit 26 at step (c1), and the same time delivered to the printing density judging and ink feeding amount setting unit 28a.
  • the target density data Do is beforehand inputted to the unit 28a by the density data inputting member 30a at step (d1). These two data A′n and Do are compared with each other at step (e1) to find a difference therebetween. Then, the difference is compared with the density difference data d, which has been previously inputted to the unit 28a at step (f1), in order to detect whether or not the measured density is within the predetermined density range at steps (g1) and (g′1).
  • the press proofing operation continues producing an n + 1st sheet of printing at step (o1), where the printing density data A′n is judged to be equal to or larger than the target density data Do at step (e1) and at the same time the difference of the data A′n from the data Do is judged to be equal to or larger than the density difference data d at step (g1), which means that the measured density of the patches is larger than the target density and beyond the predetermined density range.
  • the printing density data A′n is equal to or larger than the target density data Do and at the same time the difference of the data A′n from the data d is smaller than the density difference data d, which means that the detected density is within the predetermined density range, there is further found a difference between the printing density data A′n and a printing density data A′n-1 which has been obtained in connection with a preceding n - 1 st sheet of printing at step (a1) and stored in the memory 426 at step (k1) to be accessed from the memory 426 at step (l1), so that at step (i'1) the difference of the data A′n-1 from the data A′n is compared with the density variation data ⁇ d which has been inputted in the unit 28a by the member 30a at step (h1), in order to determine whether or not a density decrease amount is larger than a preset amount.
  • the proofing continues to yield the n + 1st of sheet of printing at step (o1).
  • this difference is larger than the variation data ⁇ d, which means that the density decrease amount is greater than the preset amount, the proofing does not continue for the production of the n + 1st sheet of printing even when the measured density is larger than the target density.
  • an ink replenishing data representative of the amount of ink to be replenished on the basis of the comparison of the two density values at step (j1).
  • the replenishing data is delivered to the control circuitry 34, which then drives the ink feeding unit 32 at step (m1) upon the receipt of the data, so as to respectively supply ink in the neccessary quantities to the positions of the inking rollers 20 corresponding to the density control patches 40 at step (n1).
  • Such ink replenishing to the inking rollers 20 by the unit 32 is completed before the carriage 12 returns to the home position in contact with the inking device 10 after the printing density measuring operation is terminated, or while the carriage 12 is kept stationary to stand by a succeeding printing operation.
  • the ink replenishing may be conducted while the carriage 12 is in reciprocating motion to perform the proofing.
  • the ink kneading is executed for a predetermined time after the rollers 20 receive replenished ink, and thereafter the following n + 1 sheet of printing is produced at step (o1).
  • the ink replenishing data is found on the basis of the comparison of the two density values as aforementioned at step (j1). Then, the data is transmitted to the control circuitry 34, which, upon the receipt of the data, actuates the ink feeding unit 32 at step (m1), so as to respectively supply ink in the neccessary amounts to the axial positions of the inking rollers 20 corresponding to the patches 40 at step (n1). After the ink kneading is conducted for a predetermined time, the succeeding n + 1st sheet of printing is yielded at step (o1).
  • the printing density A′n is smaller than the target density data Do and at the same time the difference of the latter from the former is smaller than the difference data d, which means that the detected density is within the predetermined density range
  • the proofing does not continue for the production of the n+1 st sheet of printing, and ink in the neccessary quantites is replenished to the inking rollers as in the above procedures at steps (j1) through (n1). Then, after the ink kneading, the n+1 sheet of printing is produced at step (o1).
  • the proofing continues to yield the n+1 st sheet of printing at step (o1) without replenishing ink even if the detected density is lower than the target density.
  • the memory 426 is renewed to store the data A′n instead of the data A′n-1 concerning the n-1 st sheet of printing at step (k1).
  • the density difference data d is equally set in the case where the detected density is higher than the target density and in the converse case in the above embodiment, the data d may be not neccessarily equally set, and may be suitably changed together with variation data ⁇ d depending on the type of the press proof machine, the characteristics of ink employed, and the like.
  • Figs. 16 and 17 depict density changes of the patches impressed on the same position of the printings sequentially produced by the aforementioned steps shown in Fig. 15.
  • Fig. 16 illustrates the case where a measured density value a1 of one patch on a first sheet of printing is extremely low as compared with the target density value Do.
  • the measurement of the printing density is sequentially conducted in connection with each sheet of printing successively produced.
  • the ink replenishment is conducted after a third sheet of printing is produced so as to obtain printing density values a1 through a3 in connection with the three sheets of printings successively produced, respectively.
  • a printing density value a4 detected in connection with a fourth sheet of printing is lower than the target density Do, but the value a4 falls within the range of the density difference value d.
  • Fig. 17 depicts the case where a measured density value b1 of one patch 40 on the first sheet of printing is extremely high as compared with the target density value Do.
  • the ink replenishment is not yet executed upon completion of the measurement of the printing density in connection with the fourth sheet of printing to obtain a density value b4 therefor.
  • a density value b5 detected in connection with the fifth sheet of printing is still above the target density value Do, ink feeding is conducted after such detection of the value b5 because of the fact that the value b5 is within the density difference range d and further that a density decrease amount which is found by subtracting the density value b5 from a density value b4 of the patch in connection with the fourth sheet of printing is larger than the predetermined variation ⁇ d.
  • the printing density varying in level from the value b5 to the value b10 as shown in a solid line of Fig. 17, is more promptly approximated to the target density value Do and more stably maintained as such, than the printing density of the case where the ink feeding is not performed even after the fifth sheet of printing is produced and a density value b5 is obtained in connection therewith so that as shown in a broken line of Fig. 17 the printing density changes in level from the value b5 to b10 via b6 to b9 which are subsequently obtained in connection with the sixth through tenth sheets of printigs.
  • Fig. 18 is a block diagram depicting an arrangement of an automatic ink feeding apparatus according to the fourth embodiment of the invention, wherein like or corresponding parts are denoted by like reference symbols of the first embodiment.
  • the automatic ink feeding apparatus is generally constituted by the printing density measuring unit 24, the printing density displaying and recording unit 26, a printing density judging and ink feeding amount setting unit 28b, a density data inputting member 30b, the ink feeding unit 32, and the control circuitry 34.
  • the printing density judging and ink feeding amount setting unit 28b is provided with an operation circuit that compares printing density (A ⁇ n) of the respective patches 40 detected by the unit 24 and the target density preset therefor, and that compares the density with one or more ink feeding amount changing density when the density is lower than the target density, so as to calculate required amounts of ink to be replenished to the respective axial predetermined positions on the inking rollers.
  • the density data inputting member 30b is provided to input discrete target density data Do, and predetermined density data D′1 and D′2, for respective coloring materials to the random access memory (RAM) of the unit 28b.
  • These data D′1 and D′2 are such as demanding that an ordinary feeding amount of ink be varied.
  • the member 30b is a keyboard, for example, and may be omitted where these data are in advance inputted to the read only memory (ROM) of the unit 28b.
  • a memory 532 may be additionally provided for storing therein ink feeding data found for individual operation processes.
  • a printing plate having undergone an exposure treatment wherein exposures of the image 38 and the printing density control patches 40 are made on a suitable portion of the surface of the printing plate and on a portion to be a blank or margin of the printing plate, respectively.
  • the positions of the printing density measuring unit 24 and the ink spouting outlet 102 of the ink feeding unit 32 are so adjusted as to properly correspond to the positions of the control patches 40, respectively.
  • the ink feeding unit 32 which feeds ink to the axial predetermined positions on the inking rollers 20 in equal quantities, or required quantities suitable for the size of the image.
  • the density of the patches 40 is measured by the unit 24 at step (a2).
  • the printing density data A ⁇ 1 is obtained at step (b2).
  • Such data A′1 is displayed and recorded by the unit 26 at step (c2), and at the same time delivered to the unit 28b.
  • the target density data D′o is beforehand inputted to the unit 28b by the inputting member 30b at step (d2).
  • the data F teaches that it is necessary to supply ink with the positions of the inking rollers corresponding to patches P1, and P4 through P11 except for P2 and P3.
  • the data F thus found is then transmitted to the control circuitry 34, which drives the ink feeding unit 32 upon receipt of the data F at step (g2), so that a fixed amount of ink is respectively fed to the positions of the inking rollers 20 corresponding to the patches P1 and P4 through P11 by the unit 32 while the ink feeding part 62 of the unit 32 is moved along the axial direction of the rollers 20 from the left to right end thereof (see Fig. 4) at step (h2).
  • step (j2) a comparison is made between the printing density data A ⁇ 1 and the density data D′1 that is in advance inputted to the unit 28b at step (i2). Where the printing density data A ⁇ 1 is equal to or larger than the data D′1 with respect to all the patches 40, the proofing operation for the second sheet of printing follows at step (s2) after ink kneading is completed.
  • the data S is then delivered to the control circuitry 34, which upon receipt of the data drives the ink feeding unit 32 at step (12), so that the amount of ink equal to that in the the preceding feeding operation is respectively supplied to the positions of the inking rollers 20 corresponding to the patches p6 through p10 by the ink feeding unit 32 at step (m2) while the feeding part 62 travels along the axial direction of the inking rollers 20, for example, from the right end to the left end thereof.
  • step (o2) a further comparison is made between the printing density data A ⁇ I and the feeding amount changing density data D′2 which is beforehand inputted to the unit 28b at step (n2).
  • the press proofing follows to produce the second sheet of printing at step (s2) after the ink kneading is completed.
  • the density data A ⁇ 1 of any of the patches 40 in the direction parallel to the axial direction of the inking rollers is lower than the density data D′2
  • an ink feeding data R for use in a third ink feeding that specifies those axial positions of the inking rollers which correspond to the ones of the patches having lower density than the density of the data D′2 at step (p2).
  • the density data A ⁇ 1 of the patch p8 is detected to be lower than the data D′2 and accordingly the data R shows that the axial positions of the inking rollers corresponding to the patch p8 are required to apply a third ink feeding thereto.
  • the data R is transmitted to the control circuitry 34, which upon the receipt of the data actuates the ink feeding unit 32 at step (q2), so that the amount of ink equal to that in the preceding first or second feeding operation is fed to the axial positions of the inking rollers corresponding to the patch p8 by the feeding part 62 of the unit 32 at step (r2) while the part 62 is moved along the axial direction of the inking rollers, for example, from the left end to the right end thereof.
  • the press proofing for the second sheet of printing follows at step (s2).
  • Such ink replenishing onto the inking rollers 20 by the feeding unit 32 is completed before the carriage 12 returns to the home position in contact with the inking device 10 after the printing density measuring operation is terminated, or while the carriage 12 is kept stationary to stand by a succeeding proofing operation.
  • the ink replenishing may be conducted while the carriage is in reciprocating motion to perform the pressing.
  • step (a′2) through (f′2) are concerned. Namely, the density measuring step through the data F obtaining step are conducted in the same manner.
  • the data F so obtained is not immediately delivered to the control circuitry 34 for the purpose of actuating the feeding unit 32 to feed ink. Instead, the data F is stored in the memory 532 at step (t), which shows, as regards the case shown in Fig. 21, for example, that the axial positions of the inking rollers corresponding to the patches p1 and p4 through p11 except for those p2 and p3 are to receive ink in the first feeding operation.
  • the data S which teaches that the second ink feeding is to be conducted with regard to the positions corresponding to the patches p6 through p10 after steps (i′2), (j′2) and (k′2) are taken in the same manner as in the preceding example of Fig. 19.
  • the data S is stored in the memory 532 at step (u).
  • the data R is obtained which shows that the third ink feeding is to be performed in regard to the position corresponding to the patch p8 by taking steps (n′2), (o′2), and (p′2).
  • the data R is likewise stored in the memory 532 at step (v).
  • the circuitry 34 actuates the feeding unit 32 at step (q′2), so that the fixed amount of ink is applied by the unit 32 once to the axial positions of the inking rollers 20 corresponding to the patches p1, p4, p5, and p11, twice to those corresponding to the patches p6, p7, p9 and p10, and thrice to those corresponding to the patch p8, respectively, at step (r′2) during, for example, the feeding part 62 of the unit 32 reciprocates along the axial direction of the inking rollers one and a half times. Then, after the ink kneading is conducted for a predetermined time, the press proofing operation for the second sheet of printing follows at step (s′2).
  • Fig. 22 illustrates an example of density changes of patches formed on the same positions of the printings successively produced by the press proofing operation adopting the staged plural times ink feeding technique as explained above.
  • Detected density z1 of the patch on a first sheet of printing which is produced immediately after the initial press proofing starts is extremely lower than the target density data D′o.
  • the density z1 is detected to be lower than the density data D′2 after the measurement of the density of the first sheet of printing, the fixed amount of ink is thrice fed to the axial positions of the inking rollers corresponding to the patch of the density z1.
  • measured density z2 of the patch corresponding to the patch of the first sheet of printing is detected to be intermediate between the data D′1 and D′2. Accordingly, the fixed amount of ink is twice fed to the axial positions of the inking rollers corresponding to the patch of the density z2. Thereafter, the printing density rises up rapidly.
  • a third sheet of printing is produced and density of the impressed patches is measured, it is detected that density z3 of the patch corresponding to the patch of the density z2 is intermediate between the target density data D′o and the feeding amount changing data D′1. Accordingly, that amount of ink is fed just one time to the axial positions of the inking rollers corresponding to the patch having density z3.
  • the axial positions of the inking rollers corresponding to the patchs P2 and P3 receive no ink, since the density thereof is above the target density D′o.
  • the density level shown in Fig. 21 is divided into three regions, i.e., a region (1) defined by the levels of the target density data D′o and the density data D′1, a region (2) between the data D′1 and D′2, and a region (3) below the data D′2.
  • the memory 532 is stored a data that the fixed amount of ink is to be fed one time to the axial positions of the inking rollers corresponding to the patches p1, p4, p5, and p11 each density of which belongs to the region (1). Also, there is stored in the memory (532) another data that the amount of ink is to be fed two times to the axial positions of the inking rollers corresponding to the patches p6, p7, p9, and p10 the density of each of which pertains to the region (2). Furthermore, there is stored in the memory 532 still another data that the amount of ink is to be applied three times to the axial positions of the inking rollers corresponding to the patch p8 the density of which belongs to the region (3). These stored data are delivered to the control circuitry 34, in order to control the feeding amount of ink.
  • the two feeding amount changing data are set and the required amount of ink is reached at two stages.
  • the mode of such staged feeding is not limited to this one whatsoever.
  • the prescribed amount of ink is fed to the inking rollers plural times by the pump while the feeding part reciprocates along the axial direction of the inking rollers at equal velocity as mentioned above.
  • the feeding part is stopped at predetermined positions while in the reciprocating motion and that the fixed amount of ink is fed plural times when the feeding part is at each predetermined position.
  • the feeding part is moved at reduced velocity at predetermined positions and that the prescribed amount of ink is fed plural times when the feeding part is at each of the predetermined postions.
  • the ink feeding may be performed by utilizing such a fixed amount feeding type ink pump as in the second embodiment shown in Figs. 11 through 13C, which is so arranged that its effective ink spouting stroke can be instantaneously changed and hence that the amount of ink to be spouted in one feeding operation can be changed.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (10)

  1. Automatische Farbzuführung in einer Rotationsoffsetandruckpresse mit automatischen Farbzufuhrmitteln (32) zum Zuführen von Farbe (94) zu Farbwalzen (18, 20), Dichtemeßmitteln (24) zum Messen einer Mehrzahl von Bereichen (40) zur Verwendung bei der Dichtesteuerung von auf ein Leerbild (38) eines Druckpapiers von der Andruckpressmaschine aufgedrückten Drucken, Betätigungsmitteln (28, 28a, 28b) zum Vergleichen der Druckdichte (A, A'n, A''n) der von den Meßmitteln (24) erfaßten Bereiche (40) mit einer vorgegebenen Solldichte (B, Do, D'o) und zum Ermitteln von Daten, die die erforderliche Menge an Farbe, die zu vorgegebenen Axialpositionen der Farbwalzen (18, 20), zuzuführen ist, beziehungsweise auf der Basis dieses Vergleichs jeweils den Bereichen (40) entspricht, betreffen, dadurch gekennzeichnet, daß die automatischen Farbzufuhrmittel (32) einen Farbzufuhrteil (62) aufweisen, der entlang der axialen Richtung der Farbwalzen (18, 20) beweglich ist, wobei der Farbzufuhrteil (62) eine Farbpumpe (90), in der ein Farbtankteil (92, 278) Farbe (92) aufnimmt, auf die durch Druckmittel ständig Druck (96) aufgebracht wird, eine Kolbenstange (100, 316), die zum Ausdrücken von Farbe (94) in eine Zufuhrpassage (104, 314) durch ein Antriebsteil (98, 282) betrieben wird, und ein Ventilteil (310), das ein offenes Ende der Zufuhrpassage (104, 314) verschließt, aufweist, und daß Steuermittel (34) zum Betätigen des Farbzufuhrmittels (32) zum Zuführen der Mengen an Farbe (94) zu den Axialpositionen der Farbwalzen (18, 20) auf der Basis dieser Daten vorgesehen sind.
  2. Automatische Farbzuführung nach Anspruch 1, wobei ein Speicher (426) Daten betreffend die Dichte (A'n-1) der Bereiche (40) wenigstens auf dem zuletzt erzeugten Druckblatt speichert und das Betriebsmittel (28a) beurteilt, ob oder ob nicht eine Differenz (A'n - Do, Do - A'n) zwischen der vorgegebenen Solldichte (Do) und der erkannten Dichte (A'n) kleiner ist als ein vorgegebener Solldichtewert (d) und eine Dichteveränderung (A'n - A'n-1, A'n-1 - A'n) zwischen der Dichte (A'n) und der gespeicherten Dichte (A'n-1) erkennt in dem Fall, in dem eine Differenz (A'n - Do, Do - A'n) zwischen der Dichte (A'n) und der Solldichte (Do) kleiner ist als der vorgegebene Dichtewert (d) ist, so daß ein Vergleich der Dichtevariation (A'n - A'n-1, A'n-1 - A'n) mit einer vorgebenen Dichtevariation (Δd) durchgeführt wird und das Regelmittel (34) das Farbzufuhrmittel (32) auf der Grundlage des Vergleichs zur Zuführung der erforderlichen Mengen an Farbe (94) zu den Axialpositionen der Farbwalzen (18, 20) den jeweiligen Bereichen (40) freigibt oder nicht freigibt.
  3. Automatische Farbzuführung nach Anspruch 1, wobei das Betätigungsmittel (28b) einen Dichtebereich ((1), (2), (3)) von wenigstens zwei unterschiedlichen Dichtebereichen ((1), (2), (3)), in die die gemessene Dichte (A''n) der Bereiche (40) fällt, in dem Fall, wo die Dichte (A''n) kleiner ist als die Solldichte (D'o) und das Steuermittel (34) das Farbzufuhrmittel (32) betätigt, um die erforderlichen Mengen an Farbe (94) zu den Axialpositionen der Farbwalzen (18, 20) entsprechend den jeweiligen Bereichen (40) derart gestuft zuführt, wie sich dies aus dem gemessenen Dichtebereich ergibt.
  4. Farbzuführung nach Anspruch 3, wobei Mittel vorgesehen sind zum Zuführen einer festen Menge an Farbe (94) zu den Farbwalzen (18, 20) mehrere Male während eines Zufuhrvorgangs in bestimmten Weisen der gestuften Form, wobei die Menge an Farbe (94), die den Farbwalzen (18, 20) zugeführt wird, während eines Zufuhrvorgangs geändert wird.
  5. Farbzuführung nach einem der vorangehenden Ansprüche, wobei das Antriebsseil (282) eine die Farbzufuhrmenge ändernde Einheit (342) aufweist, die mit einer Mehrzahl von den Hub ändernden Platten (348, 350) in unterschiedlicher Dicke versehen ist.
  6. Farbzufuhrpumpvorrichtung in einer Rotationsoffsetandruckpresse, wobei eine Kolbenstange (316) vorgesehen ist, die betrieben wird zum Ausdrücken von Farbe (94) in eine Zufuhrpassage (314) durch ein Antriebsteil (282), und ein Ventilteil (310) vorgesehen ist zum Schließen eines offenen Endes der Zufuhrpassage (314), dadurch gekennzeichnet, daß ständig Druck (96) auf die von einem Farbtankteil (278) aufgenommene Farbe (94) aufgeübt wird.
  7. Farbzufuhrpumpvorrichtung nach Anspruch 6, wobei das Ventilteil (310) einen Ventilsitz (322), der mit dem offenen Ende der Zufuhrpassage (314) verbunden ist, einen Ventilkörper (324) und eine Spiralfeder (326) zum Zwingen des Ventilkörpers (324) in Richtung auf den Ventilsitz (322) aufweist.
  8. Farbzufuhrpumpvorrichtung nach Anspruch 7, wobei der durch das Antriebsteil (282) von der Kolbenstange (316) ausgeübte Farbtreibdruck größer ist als der auf den Ventilkörper (324) von der Spiralfeder (326) in Richtung auf den Ventilsitz (326) ausgeübte Druck, und gleichzeitig der von der Spiralfeder (326) auf den Ventilkörper (324) ausgeübte Druck größer ist als der Druck, der von den Druckmitteln auf die Farbe (94) ausgeübt wird.
  9. Farbzufuhrverfahren in einer Rotationsoffsetandruckpresse, wobei eine Mehrzahl von Bereichen (40) für eine Dichtekontrolle der Drucke auf ein Leerbild (38) eines Druckpapiers durch die Andruckpreßmaschine aufdruckt werden, und daß die Dichte (A, A', A'') der Bereiche (40) detektiert und mit einer vorgegebenen Solldichte (B, Do, D'o) verglichen wird, und wobei die erforderlichen Mengen an Farbe (94), die zu vorgegebenen Axialpositionen der Farbwalzen (18, 20) entsprechend den Bereichen zuzuführen ist, ermittelt werden, dadurch gekennzeichnet, daß eine Menge an Farbe (94) zu Axialpositionen der Farbwalzen (18, 20) zugeführt wird, und daß die Dichte (A'n) der Bereiche (40) nach der Herstellung eines jeden Druckblatts erkannt wird, und die Dichte (A'n-1) der Bereiche (40) wenigstens des zuletzt hergestellten Druckblatts gespeichert wird, und in dem Fall, in dem die Dichte (A'n) kleiner ist als die Solldichte (Do) die Zuführung von Farbe in der erforderlichen Menge ausschließlich behindert wird unter der Bedingung, daß eine Differenz (Do-A'n) zwischen der Solldichte (Do) und der Dichte (A'n) kleiner ist als ein vorgegebener Dichtewert (d) und gleichzeitig eine Dichteerhöhungsänderung (A'n - A'n-1) der Dichte (A'n) von der gespeicherten Dichte (A'n-1) größer ist, als eine vorgegebene Dichteänderung (Δ d), während, in dem Fall, wo die Dichte (A'n) kleiner oder größer als die Solldichte (DO) ist, die Farbzufuhr in der erforderlichen Menge nur dann ermöglicht wird, wenn eine Differenz (A'n - DO) zwischen der vorgegebenen Solldichte (Do) und der Dichte (A'n) kleiner ist als ein vorgegebener Dichtewert (d) und gleichzeitig eine Dichteabnahmeänderung (A'n-1 - A'n) der Dichte (A'n-1) von der Dichte (A'n) größer ist als die vorgegebene Dichtevariation (Δd).
  10. Farbzufuhrverfahren nach Anspruch 9, wobei in dem Fall, daß die erkannte Dichte (A''n) geringer ist als die Solldichte (D'o) Vergleiche der Dichte (A''n) mit wenigstens zwei unterschiedlich vorgegebenen Dichten (D'1, D'2) durchgeführt wird, und daß die erforderlichen Mengen an Farbe (94) zu den vorgegebenen Axialpositionen der Farbwalzen (18, 19) durch Steuern entweder der Zufuhrzeiten oder aber der Zufuhrmenge für jeden Zufuhrvorgang zugeführt wird.
EP88109377A 1987-05-26 1988-06-13 Automatische Farbzuführung in einer Rotationsoffsetandruckpresse Expired - Lifetime EP0295606B1 (de)

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
JP12907387A JPS63295429A (ja) 1987-05-26 1987-05-26 ＬｕＧａＺｎ↓５Ｏ↓８で示される六方晶系の層状構造を有する化合物およびその製造法
JP13212887A JPS63296490A (ja) 1987-05-27 1987-05-27 通話路装置
JP148373/87 1987-06-15
JP62148373A JPS63312146A (ja) 1987-06-15 1987-06-15 校正機の自動インキ供給装置
JP12907387U JPS6434235U (de) 1987-08-25 1987-08-25
JP129073/87 1987-08-25
JP21112487A JPS6453845A (en) 1987-08-25 1987-08-25 Ink supply method and automatic ink supply apparatus of proof press
JP211124/87 1987-08-25
JP13212887U JPS6436139U (de) 1987-08-29 1987-08-29
JP132128/87 1987-08-29

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EP0295606A2 EP0295606A2 (de) 1988-12-21
EP0295606A3 EP0295606A3 (en) 1989-03-22
EP0295606B1 true EP0295606B1 (de) 1992-03-11

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Publication number Priority date Publication date Assignee Title
JP2772163B2 (ja) * 1991-05-29 1998-07-02 大日本スクリーン製造株式会社 平台校正機の自動インキ供給装置
DE4413773C2 (de) * 1994-04-20 1998-07-02 Heidelberger Druckmasch Ag Verfahren zur Kontrolle einer Bebilderung von Druckformen für eine Druckmaschine
US5816164A (en) * 1994-04-20 1998-10-06 Heidelberger Druckmaschinen Ag Method and apparatus for monitoring image formation on a printing form
DE9420159U1 (de) * 1994-12-16 1995-04-13 Bvs Beratung Verkauf Service Grafische Technik Gmbh, 86391 Stadtbergen Vorrichtung zur Versorgung eines Druckmaschinenfarbwerks mit Farbe
DE19513536A1 (de) * 1995-04-10 1996-10-17 Heidelberger Druckmasch Ag Druckmaschine mit mehreren Druckwerken
US7032988B2 (en) * 2002-04-08 2006-04-25 Kodak Graphic Communications Canada Company Certified proofing
DE102007018857A1 (de) * 2007-04-20 2008-10-23 Technotrans Ag Vorrichtung zum Auspressen von Farbkartuschen

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DE2728738A1 (de) * 1977-06-25 1979-01-11 Roland Offsetmaschf Einrichtung zur kontrolle und regelung des druckvorgangs an druckmaschinen
JPS60151051A (ja) * 1984-01-18 1985-08-08 Toppan Printing Co Ltd 平台校正印刷機
JPS60175637U (ja) * 1984-04-27 1985-11-21 株式会社サカエプロセス 校正機におけるインキ自動供給装置

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GB2065559B (en) * 1979-12-12 1984-04-18 Mccorquodale Colour Display Apparatus for applying liquid colour to a substrate
DE3238912C1 (de) * 1982-10-21 1984-03-15 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zum zonenweisen Abtasten der Einfaerbung eines Plattenzylinders einer Rotations-Offsetdruckmaschine

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DE2728738A1 (de) * 1977-06-25 1979-01-11 Roland Offsetmaschf Einrichtung zur kontrolle und regelung des druckvorgangs an druckmaschinen
JPS60151051A (ja) * 1984-01-18 1985-08-08 Toppan Printing Co Ltd 平台校正印刷機
JPS60175637U (ja) * 1984-04-27 1985-11-21 株式会社サカエプロセス 校正機におけるインキ自動供給装置

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