EP1727676A2 - Machines a imprimer comportant au moins un element ajustable a l'aide d'un element de reglage - Google Patents

Machines a imprimer comportant au moins un element ajustable a l'aide d'un element de reglage

Info

Publication number
EP1727676A2
EP1727676A2 EP05717090A EP05717090A EP1727676A2 EP 1727676 A2 EP1727676 A2 EP 1727676A2 EP 05717090 A EP05717090 A EP 05717090A EP 05717090 A EP05717090 A EP 05717090A EP 1727676 A2 EP1727676 A2 EP 1727676A2
Authority
EP
European Patent Office
Prior art keywords
printing
machine according
printing machine
optical detection
actuator
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.)
Granted
Application number
EP05717090A
Other languages
German (de)
English (en)
Other versions
EP1727676B1 (fr
Inventor
Harald Heinz Peter Jeschonneck
Stefan Arthur Budach
Thomas TÜRKE
Harald Heinrich Willeke
Andreas Ewald Heinrich Bernard
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.)
Koenig and Bauer AG
Original Assignee
Koenig and Bauer AG
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
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Application filed by Koenig and Bauer AG filed Critical Koenig and Bauer AG
Publication of EP1727676A2 publication Critical patent/EP1727676A2/fr
Application granted granted Critical
Publication of EP1727676B1 publication Critical patent/EP1727676B1/fr
Not-in-force legal-status Critical Current
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Links

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
    • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
    • B41F31/045—Remote control of the duct keys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/20—Calculating means; Controlling methods
    • B65H2557/264—Calculating means; Controlling methods with key characteristics based on closed loop control
    • B65H2557/2644—Calculating means; Controlling methods with key characteristics based on closed loop control characterised by PID control

Definitions

  • the invention relates to printing presses with at least one adjustable with an actuator machine element according to the preamble of claim 1, 2, 3, 4 or 5.
  • a color register system for a printing press is known from EP 0 598490 A1, wherein a computer with a camera or a group of cameras determines a misalignment of colors of a printed image by comparing a current image with a stored reference image and with a pressure control a longitudinal, Transverse and rotational position of cylinders of the printing press relative to a moved by the printing press, web to be printed aligns so that they produce a multi-color image with mutually correctly arranged colors.
  • EP 0 882 588 A1 discloses an apparatus and a method for registered registration of printing cylinders of a web-fed rotary press, wherein a first cylinder printing on one side of the web is separated from a first motor and a second cylinder is printed on the same side of the web Motor are driven and the angular position of the second cylinder is tuned in register by a controller to the first cylinder, wherein from the cylinders on the train printed registration marks with a behind the last cylinder in the direction of production sensor, z.
  • a CCD camera recorded and evaluated using characteristics as a reference variable for the controller.
  • DE 19736 339 A1 discloses a printing press with printing cylinders for printing a substrate with a forme cylinder associated, an ink fountain inking unit is known, wherein at least one inking roller and preferably also the forme cylinder are each associated with temperature control, wherein the temperature control means a control or a control device in which, based on default values, temperature target values of the printing ink can be set for at least one inking unit roller, wherein the default values can be dependent on an optical density measured on the printing substrate with a photometric sensor or a density meter customary in the printing industry, and thus in particular from a print image evaluation of current production of printed copies are derivable.
  • the temperature control means a control or a control device in which, based on default values, temperature target values of the printing ink can be set for at least one inking unit roller, wherein the default values can be dependent on an optical density measured on the printing substrate with a photometric sensor or a density meter customary in the printing industry, and thus in particular from a print image evaluation of
  • a rotary printing machine with a printing unit by means of which printing ink can be brought to a printing unit passing through the printing material, wherein at least one cooperating with the ink and controllable by a tempering device component is provided by means of the tempering the harshness of the printed ink is adjustable to a certain range.
  • EP 1 512 531 A1 discloses a method and an apparatus for controlling the color in a printing machine are known, wherein a color recognition device is provided with a plurality of stationary attached to the printing press color sensors for area-wide optical detection of the entire width of the printed product, with a fast primary color measurement signal per color zone is detected, wherein integrated along the printing direction over a predeterminable color image area of the printed product, wherein the total actual area coverage is calculated for at least one ink, wherein a comparison is made with a target area coverage and wherein a color correction signal for the color zone and the printing ink is generated.
  • WO 2005/016806 A1 discloses a method for controlling the cut register of a web-fed printing press in which certain image information or measurement marks of printed webs are detected by means of sensors and fed to a control device, wherein before and / or on the common knife cylinder one for the deviation of Position of the printed image with respect to its desired position based on the location and time of the cut, ie for the cut register error, suitable image information or measurement marks at least one of the printed webs detected by means of at least one sensor, evaluated and / or converted to an actual value, for the control the cutting register error of at least one web is used, and that for correcting the cutting register error of the at least one web either the speed of at least one located in front of the knife cylinder nip and / or the position of the knife cylinder is changed so that the Thomasregcreste r the at least one path is corrected in accordance with the actual value to a predetermined setpoint.
  • each dampening unit moisturizes a arranged on a forme cylinder of the printing units printing form in several juxtaposed in the longitudinal direction of the forme cylinder zones, wherein a control device with a camera in each of the zones measures a color density of the printed ink applied to a printing substrate in the printing press, wherein the control device adjusts a dosage of the dampening solution in the zones on the basis of a correction signal derived from the measurement of the color density.
  • the invention has for its object to provide printing presses with at least one adjustable with an actuator machine element, with a quality of the pressure is adjustable and stable at the set level in the continuous printing.
  • the achievable with the present invention consist in particular in that a quality of the pressure is adjustable and can be maintained at the set level in the production pressure.
  • a disturbing variable which negatively influences the quality of the print is effectively counteracted in a coordinated manner with other disturbance variables as soon as the detecting device detects the negative effect of the disturbance on the quality of the print. This is possible because with the detection device all affecting the quality of the pressure disturbances can be detected.
  • Simultaneous detection of all disturbances both in real time and close to the location at which the quality of the print is produced, allows a fast-acting control by evaluating the output of only one detector, so in terms of pressure after a very short time a stable operating condition with a good quality is achievable.
  • the holistic detection of the quality of the pressure in conjunction with an evaluation of the correlated with her data in terms of several, preferably all the quality of the pressure affecting interference means for a press operator operating a considerable amount of work, because this is not a variety of different tax and / or monitor and / or operate controls got to.
  • FIG. 1 is a simplified view of an offset sheet printing machine in a side view
  • FIG. 2 shows a simplified illustration of an offset roller printing machine in a side view
  • Fig. 3 is a simplified block diagram of a quality of a pressure regulating control loop.
  • Fig. 1 shows a printing machine, which is exemplified as a sheet-fed press.
  • the printing machine can also be designed as a web-fed printing machine.
  • the printing machine is designed in particular as an offset printing machine.
  • the printing press prints using a waterless offset printing process.
  • the printing machine exemplified in FIG. 2 is a waterless, d. H. without the addition of a fountain solution printing press.
  • the printing press preferably has a plurality of printing units 01, each of which prints the same printing substrate with one printing ink.
  • five printing units 01 are subsequently provided in the transport direction of the printing stock in series construction. It then followed by a painting in the form of a coating tower 02 and a delivery extension 03 and at least one boom 04.
  • a sheet feeder 06 is arranged at the opposite end of the sheet printing machine.
  • the number of successive printing units 01 can be selected lower or higher as needed in the example shown. An extension to ten printing units 01 is quite possible.
  • At least one of the plurality of printing units 01 may be formed as an imprinter, so that on the printing machine a flying plate change, ie a change of printing plates on one or more cylinders 08 during ongoing production of the printing machine due to a separation of the relevant forme cylinder 08 from the current printing process is possible
  • the sheet-fed press can be provided for a perfecting, ie for a two-sided printing on the sheet-fed printing machine passing through the substrate, and to realize this function z. B. have a turning device.
  • the imprinter function can be provided for the perfecting, ie on both sides of the printing material.
  • Imprinter-capable printing units 01 can also be used for the printing of spot colors and others. Apart from an arrangement of the printing units 01 in a row construction, an arrangement in the form of a tower with a substantially vertical guidance of the printing material can also be provided.
  • the substrate is preferably one or more reel changers 21 one or more printing units 01 supplied, the printing units 01 to form a printing tower on each other stacked can be arranged.
  • the printing material is preferably fed to a web press or at least a part of their printing units 01 associated folding apparatus 22, wherein the folding apparatus 22 as a Querfalzapparat 22 and / or longitudinal folding apparatus 22 may be formed.
  • the substrate is different depending on the type of press used Material in the form of sheets or a material web, each preferably consisting of a material made from digested plant fibers and, depending on their application and their basis weight of the product type paper ( ⁇ 150 g / m 2 ), cardboard (150 to 600 g / m 2 ) or cardboard (> 600 g / m 2 ) are attributable.
  • the size of a sheet can be longitudinal to its transport direction by the printing machine z. B. more than 1,000 mm and transverse to its transport direction z. B. be more than 700 mm.
  • a web can along its transport direction through the printing press a width z. B. of more than 1,000 mm.
  • a paper consisting of printing material can be coated on one side or both sides on its surface, ie with a white, single-layer or multi-layer coating amount of pigments, binders and additives, eg. B. optical brighteners, be provided, whereby the surface of the printing material is selectively influenced in terms of their brightness, hue and / or their production-related structure or roughness.
  • the basis weight of the amount of ink is z. B. in the range between 5 and 20 g / m 2 , preferably between 5 g / m 2 and 10 g / m 2 .
  • the surface of the printing material can z. B. for use as banknote paper or document paper also have an embossed or embossed structure, which structure may be flat or formed as a relief.
  • the printing usually involves several printing inks, which after the overprinting of several color separations in an autotypical color mixing process complement one another to form a multicolored print image, each color separation printing only one of the printing inks involved in the printing onto the printing substrate.
  • the primary inks used are magenta, cyan and yellow inks, from which a variety of other shades are mixed.
  • ink in the color black is used.
  • one or more spot colors can be printed to create a custom tone or effect in print.
  • the colorimetric properties of the printing inks used in the printing in conjunction with the nature of the printing material to which the printing inks are applied in the printing press, considerably influence the color gamut reproducible in the printing process.
  • the colorimetric properties of the printing inks are u. a. also dependent on the chemical composition of their color pigments. For the most part, comparatively expensive color pigments can, for example, expand the color space reproducible with this printing ink.
  • the substrate used z. B. the reproducible with an ink color contrast. In coated papers, an optical density of about two density units can be achieved in the Ubross print of the primary inks for the full tone.
  • the multicolored print image is composed by color separations having dots in each case, wherein for all In each case, a color separation is provided on the printing inks involved and the screen dots of different color separations are applied to the substrate both free-standing side by side and one above the other.
  • the quality of the print is influenced by the type and fineness of the screening, ie the shape and arrangement of the screen dots.
  • halftone dots can typically be reliably transferred from a size of about 10 .mu.m, with screen rulings between 50 and 80 lines per cm being common in multicolor printing.
  • Fine grids for the reproduction of filigree structures have up to 150 lines per cm, because the finer the screening, the higher the resolution of the print and thus the reproducibility of fine structures.
  • the quality of the print can be further increased.
  • a suitable screen angle of color separations involved in the printing at angular intervals of z. B. each 15 ° Mo can be largely avoided.
  • Grid points can z. B. have a circular, square or elliptical shape and be arranged in an amplitude-modulated, frequency-modulated or intensity-modulated screening.
  • the individual grid points In the case of an amplitude-modulated grid, the individual grid points have a constant center point spacing and vary in their areal extent, whereas with a frequency-modulated grid, the individual grid points have a constant areal extent with varying center distances.
  • intensity-modulated screening the layer thickness of the screen dots applied to the printing substrate is varied, whereby the optical density of the screen dots is changed. Hybrid forms of screening with multidimensional modulation are possible.
  • the nature of the inks used in printing has a lasting effect on the quality of the print.
  • the nature of the ink also includes its rheological behavior, d. H. their fluidity and their adhesion to the substrate as well as on screen dots at least one previously printed color separation.
  • the fluidity of the ink is determined by its viscosity. The higher viscosity a printing ink is, the tougher it is, with the result that it runs worse and is more difficult to distribute to a homogeneous film.
  • the adhesion of the ink is specified by its speed.
  • the viscosity and tack of an ink are temperature dependent. Also, a production speed of the printing press, with which the substrate is transported through the printing press and the z. B. in a sheet-fed press 18,000 sheets / h or 16 m / s may be in a web printing press, at least indirectly on the viscosity and speed of the ink influence. In order for a subsequently printed ink to adhere to a previously printed ink during the overprinting of several printing inks, the subsequent printing ink must have a lower tack value ("trapping").
  • the printing press shown in the examples of FIGS. 1 and 2 has at least one adjustable with an actuator 07 machine element 08, wherein an adjustment of the at least one machine element 08 on the quality of the executed by the printing press as a controlled system 09, ie to be controlled Track, works, wherein a detection device 11, preferably an optical detection device 11, with a directed onto a surface of a printed substrate in the printing press sensor detects the quality of the pressure and wherein a data received from the optical detection device 11 control device 12 with the actuator
  • the at least one machine element 08 as a function of a difference between a predetermined value as the desired quality of the pressure and detected as the actual value of the optical detection means 11 quality of the pressure preferably after reaching or exceeding an allowable tolerance limit in a the difference between the setpoint and the actual value setting minimizing way.
  • a temperature control for controlling the temperature of at least part of a lateral surface of a rotary body of the printing machine, wherein the rotary body is involved in the transport of a printing ink to the printed in the printing machine with the printing material.
  • the temperature control can perform the temperature control with a gaseous and / or a liquid temperature control, ie the temperature z. B. with air or make with water, wherein the temperature control z. B. jacket surface near channels of the body of revolution flows through.
  • the tempering ensures that the u. a. on a arranged in the printing unit 01 form cylinder and then in a further transmission path to the substrate to be transferred ink their temperature z. B. in a range between 20 ° C and 40 ° C holds.
  • the tempering device acts on at least one rheological property of the printing ink, wherein the rheological property of the printing ink is preferably its viscosity or tackiness.
  • the tempering keeps the viscosity of the ink in a relation to the ambient air of the printing press temperature range of z. B. 20 ° C to 40 ° C to a preferably in the range between 1 and 150 Pa * s constant value, in particular to a range between 10 Pa * s and 100 Pa * s lying value.
  • the tack of the printing ink is maintained by the tempering device in the temperature range between 20 ° C and 40 ° C preferably to a Tackwetlim range between 6 to 9.5, in particular to a tack value in the range 7 to 8.5, and in the respective region of Tack values preferably to an approximately constant tack value.
  • the tempering device may be set such that it alternatively or in addition to their setting in the temperature range between 20 ° C and 40 ° C, the tack of the ink for a production speed of the printing press of 3 m / s to 16 m / s to a tack value in the range between 4 and 12 stops.
  • the tempering device keeps the tack of the printing ink for a production speed of the printing press of 3 m / s to 16 m / s to an approximately constant tack value.
  • the tempering When printing several printing inks on the same substrate, the tempering preferably sets the tack value of the printed inks differently.
  • the inks printed by at least two printing units on the same substrate have mutually differing tack values.
  • the tempering is preferably set such that preferably reduces the pressure of several inks on the same substrate, the tack value of the printed inks from the first to the last printed printing ink steadily.
  • each printing unit 01 has at least one tempering device for tempering at least part of the lateral surface of at least one rotational body of the printing unit 01 and that, furthermore, each tempering device is adjustable independently of another tempering device in the same or in another printing unit 01.
  • the tempered rotary body is formed as a forme cylinder 08 in a printing unit 01 or as an anilox roller in an ink on the forme cylinder 08-applying inking unit 13.
  • Another machine element 08 may be formed as a metering device of the inking unit 13 for metering the amount of ink to be transferred to the printing substrate. This metering device can in the axial direction of the forme cylinder 08 more, z. B.
  • the metering device can, for. B. controllable zone screws, wherein in the multi-color printing printing machine a total of several hundred individually controllable zone screws can be provided.
  • the metering device meters a quantity of the printing ink to be transferred to the printing substrate by adjusting its layer thickness and / or its application time.
  • the metering device can also be used as an ink supply system using at least one paint pump, e.g.
  • the inking unit can be configured as a roller inking unit consisting of many rollers or as a short inking unit. Alternatively, the inking unit can also be designed as a spray-inking unit which atomises ink, preferably printing ink, on a paint ductor and sprays it on an ink fountain roller.
  • At least one forme cylinder 08 and a cooperating with this forme cylinder 08 transfer cylinder 14 are provided, it is advantageous that the forme cylinder 08 and the transfer cylinder 14 as the actuators 07 preferably each one independently z.
  • the printing machine is therefore preferably formed undulating, the drives of the forme cylinder 08 and / or the transfer cylinder 14 are mechanically decoupled from a drive of an associated impression cylinder 16, and the drives the cylinder 08; 14; 16 Rotate while pushing.
  • the forme cylinder 08 and the transfer cylinder 14 z.
  • the controllable drives are mechanically coupled with gears and have a common controllable, position-controlled drive, but that this common drive is mechanically decoupled in any case by a drive of the impression cylinder 16.
  • the controllable drives is a phase angle or angular position between the forme cylinder 08 and / or the transfer cylinder 14 relative to the impression cylinder 16 or relative to another forme cylinder 08 of the printing press adjustable and preferably adjustable, the phase position or angular position for setting a toyssreg isters is usable. But it can also be provided for positive adjustment of the forme cylinder 08 to the impression cylinder 14, an actuator for phase adjustment.
  • the circumferential register influences the positional accuracy of a color separation relative to a reference edge or reference line of the printing material directed transversely to the transport direction of the printing material.
  • each printing unit 01 of the printing press shown by way of example in FIG. 1 in each case has an inking unit 13 and a dampening unit 17 cooperating with the forme cylinder 08, wherein the inks printed by at least two printing units 01 on the same printing substrate preferably have different color tones.
  • Another provided in the printing press actuator 07 may be an adjusting device for adjusting a contact force, wherein a roller of the inking unit 13 or a roller of a dampening solution on the forme cylinder 08 transferring dampening 17 the contact pressure on the forme cylinder 08 or on a respective other roller of the inking unit 13 or dampening unit 17 exercises.
  • This adjusting device can, for. B. be designed as a remotely operable roller lock, in which the ends of the roller of the inking unit 13 or the dampening unit 17 are mounted, wherein the roller lock by actuators arranged in it, the force exerted by a roller pressing force, the width of a roller strip or a gap width between the lateral surface of two cooperating rollers.
  • At least two rollers of the inking unit 13 or the dampening unit 17 each have an independently controllable drive, wherein a further actuator 07 of the printing machine z. B. is a control device which controls a relative speed between the independently driven rollers.
  • the control device changes the relative speed between the rollers of the dampening unit 17 for metering the amount of dampening solution transferred to the forme cylinder 08 as a function of the quantity of ink transferred from the inking unit 13 to the forme cylinder 08.
  • the printing machine has as an additional actuator 07 an actuator for setting a relative to the printing substrate inclined position of a arranged in the printing press forme cylinder 08.
  • an actuator 07 for setting a relative to the printing substrate inclined position of a arranged in the printing press forme cylinder 08.
  • the so-called "cocking" effect can be compensated if a printed image on a printing forme and / or a printing forme is arranged obliquely on a forme cylinder 08 relative to the axial direction of the forme cylinder 08.
  • at least one axial end of the forme cylinder 08 is eccentrically adjustable Bearing stored, wherein the actuator for tilting the forme cylinder 08 eccentrically adjusts its storage in the at least one eccentrically adjustable bearing relative to the bearing in which bearing the other end of the forme cylinder 08.
  • At least one bearing of the forme cylinder 08 is, for example, as an eccentric bushing If the inclination of the forme cylinder 08 does not take place by pivoting of the forme cylinder 08 about one of its bearing points, but about a pivot point arranged between the two bearing points, then the actuator adjusts to set the inclination of the Form cylinder 08 this centrally symmetrical with respect to a perpendicular standing on the surface of the printing medium axis.
  • Another actuator 07 of the printing press may be an adjusting device for the axial displacement of the forme cylinder 08. Furthermore, as an actuator 07 may also be an adjusting device for the axial displacement of at least one arranged on the forme cylinder 08 printing plate. The adjusting device for axial displacement of at least one arranged on the forme cylinder 08 printing form shifts this z. B. relative to at least one other on the same forme cylinder 08 arranged printing form. The adjusting device for the axial displacement of the forme cylinder 08 or the adjusting device for the axial displacement of at least one printing forme arranged on the forme cylinder 08 can move the printing forme arranged on the forme cylinder 08 also relative to a printing forme on another forme cylinder 08 arranged in the same printing machine.
  • the adjusting device for the axial displacement of the forme cylinder 08 or the adjusting device for the axial displacement of at least one printing forme arranged on the forme cylinder 08 can be used to adjust a side register and / or at least partially compensate for a moisture-induced transverse expansion of the printing material during its transport through the printing press, d. H. to compensate for fan-out.
  • the page register influences the positional accuracy of a color separation relative to a reference edge or reference line of the printing material directed in the transport direction of the printing material.
  • a transverse stretching of the printing material at least partially compensating image controller the image controller acting on the surface of the printing material rollers or nozzles and between two printing units 01 in the transport direction of the printing material preferably close the printing material 01 subsequently printed on the printing material is arranged.
  • an optical detection device 11 is provided with a sensor directed onto the surface of the printing material printed in the printing press.
  • the optical detection device 11 is preferably designed as an inspection system, in particular as an in-line inspection system inspecting the printing material during its transport through the printing press.
  • An inspection system extends the functionality of an optical detection device 11 to the effect that, alternatively or in particular in addition to the detection of the z. B.
  • the colorimetric, in particular spectral photometry detectable hue of color separations to each other occupied color register or the circumferential register and / or the page register of a color separation also possible disturbances in the pressure, the z. B. caused by the transport of the printing material or the printing process, detected and appropriate measures can be taken to eliminate the fault or to discharge the faulty printed product.
  • Disturbances detected by an inspection system are e.g. As scratches, kinks, paper or dirt particles, paint deposits or slugs.
  • the optical detection device 11 detects contactlessly in its basic function an assumption of at least one ink involved in the printing on the printing material printed in the printing press.
  • the optical detection device 11 detects the presence of the printing ink on at least one condition of this printing ink.
  • the nature of the printing ink can be its colorimetric hue, an optical density or a layer thickness, a shape, a position, an angle or a surface distribution of its screen dots applied to the printing substrate.
  • the optical detection device 11 can also z. B. a location of at least one grid point a printing ink involved in the printing relative to a position of at least one halftone dot of at least one other ink involved in the printing or a position of at least one halftone dot of an ink involved in the printing capture in a printed on the substrate print image, wherein the first-mentioned detection option a relative measurement and the second detection option is an absolute measurement, ie a determination of coordinates of the screen dot with respect to the print image to be printed.
  • the optical detection device 11 can capture on opposite sides of the same substrate printed images and their relative position to each other, d. H. a so-called Wenderegister. It is understood that the printed image printed on the substrate preferably consists of several color separations.
  • the optical detection device 11 detects a condition of the printing material printed in the printing press.
  • the nature of the printing material is in particular a property of its printability or its printability.
  • the nature of the printing material may be a wet expansion and / or a mechanical elongation of the surface thereof transversely and / or longitudinally in its direction of transport extending through the printing press.
  • the nature of the printing material may also be a coating amount applied to the surface thereof, in particular a coating quantity applied to the surface of the printing material having a coating weight of more than 5 g / m 2 .
  • the nature of the printing material can also affect a degree of whiteness of its surface.
  • the optical detection device 11 detects z. B. at least one mark associated with a color separation.
  • the optical detection means 11 detects two associated with a color separation, transversely to the transport direction of the printing material spaced apart marks simultaneously to z. B. to detect a disturbing influence by fan-out. It is advantageous to make the mark as a micro-mark with a width of at most 0.2 mm, that is, in an extent that is below the resolution of the human eye.
  • the optical detection device 11 can detect at least one measuring field assigned to a color separation, wherein the measuring field z. B. is a section of a color separation and contains halftone dots at least one ink.
  • the measuring field can also be designed as a measuring strip, which is preferably arranged outside of a printing area of the printed image.
  • the optical detection device 11 may, for. B. in each case a position of two a color separation associated transversely to the transport direction of the printing material not congruent measuring fields simultaneously detect to each other by the position of the measuring fields z. B. to detect a disturbing influence by fan-out.
  • a position of a color separation relative to another color separation and / or relative to a reference line of the printing material can be recognized by an evaluation of data correlating with the detection Reference line of the substrate z. B. whose lateral, directed longitudinally to the transport direction edge.
  • a detection of the position of at least one printed on the surface of the substrate color separation relative to at least one reference line of the printing substrate is z. B.
  • the center control is z. B.
  • control device 12 in response to the data provided by the optical detection means 11 data at least one arranged in the printing press guide element for guiding the printing substrate during its transport through the printing press or at least passes a signal to a control device that controls this guide element.
  • the guide element for the center control of the printing material may also be included as another control element 12 controlled by the control device 12 via an actuator 07 in the control of the quality of the pressure.
  • a plurality of control elements 12, which are each controllable via an actuator 07, are provided in the printing press for center control of the printing material.
  • the optical detection device 11 can in particular by the use of an optical device, for.
  • an optical device for.
  • the optical detection device 11 is preferably arranged behind the last printing unit 01 in the transport direction of the printing material. In a perfecting sheetfed printing machine, the optical detection device 11 is disposed in front of a turning device of the printing material.
  • the sensor of the optical detection device 11 is preferably formed as an image sensor.
  • the optical detection device 11 can have a plurality of sensors, including a plurality of image sensors.
  • the sensor is z. B. formed as a photodiode, the image sensor z. As a CCD chip or as a CMOS chip.
  • the sensor preferably senses several shades, in particular simultaneously.
  • the optical detection device 11 has z. B. a line camera or an area camera.
  • a lighting device 18 is preferably provided.
  • the lighting device 18 can emit their light permanently or pulsed and z. B. be designed as a cold light source, ie as a light source with a very low or virtually nonexistent amount of infrared in their light.
  • lighting means 18 z. B. brought several LEDs or laser diodes used.
  • the cooling device can perform the cooling of the lamps with a gaseous or liquid coolant.
  • the illumination device 18 may consist of a plurality of modules which can be aligned with one another for easier adaptation to a width of the measuring field, the color separation or the printing material directed transversely to the transport direction of the printing material.
  • the illumination device 18 is preferably close to the printing ink on the substrate to be transferred cylinder, z. B. the transfer cylinder 14, or arranged close to the impression cylinder 16. In a sheetfed press, the lighting device 18 z. B. under a kick behind the last printing unit of the printing press. The illumination device 18 has a distance to the surface of the printed substrate z.
  • Example in the range between 30 mm and 200 mm, preferably between 80 mm and 140 mm, whereas the sensor of the optical detection device 11 to the substrate has a dimensioned in the range between 10 mm and 1,000 mm, preferably between 50 mm and 400 mm distance ,
  • the distance of the illumination device 18 to the surface of the printed substrate is chosen such that on the one hand a uniform, intensive illumination of the surface of the substrate takes place, but on the other hand contamination of the illumination device 18 is largely avoided by raised during transport of the substrate dirt particles or a color spray.
  • the optical detection device 11 provides at its output according to the detection of its sensor data, for. B. digital image data, which are received by a connected to the optical detection device 11 controller 12.
  • the optical detection device 11 may preferably via the Control device 12 to offset a systematically occurring difference between the setpoint and the actual value and a signal s to a imaging device for imaging of a color separation printing printing form.
  • the control device 12 can also control a marking device for identifying the printing substrate as a function of the data provided by the optical detection device 11, wherein the marking device z. B. as an ink-jet printer, as a typographic printing printing printing device or as a punching device is formed or has a laser.
  • the marking device is designed as a printing device that prints in a typographical printing method, it works z. B. in a high pressure similar method or in a Lettersethabilit similar to a numbering.
  • control device 12 can control a switch for changing the transport path of the printing material depending on the data provided by the optical detection device 11, the switch, which can also be referred to as a waste gate , one of the control device 12 for well-found printed product of a first display and a bad for printed product z. B. zu merge a second display.
  • the optical detection device 11 in turn emits a signal s via the control device 12 to a control device for controlling a folding device 22 downstream of the printing couples 01, this signal s in particular for controlling a cutting cylinder of the folder 22 is used to cut or perforate a printed with the printing units 01 of the printing press web transversely to its transport direction in dependence on the position of the printed image.
  • the cutting device or perforating device can be used as a cutting cylinder arranged in the folding apparatus 22 be formed, wherein the control device 12 controls or regulates a phase position or angular position of the cutting cylinder relative to the detected by the optical detection device 11 position of the printed printed image. The control device 12 then controls or regulates the so-called cut register.
  • Substrate longitudinal cutting cutter or longitudinal perforating perforating z. B. is arranged before the entry of the printing material in the folder 22 or in this. In this way, the entire trimming of the printing material can in each case be carried out as a function of the position of the printed printed image recognized by the optical detection device 11.
  • the position of the printed image may be relative to a reference edge or reference line of the substrate or relative to a machine-fixed location reference, z. B.
  • the optical detection device 11 may, for. B. be arranged on a guide roll in front of a Querfalzapparat 22 and / or before a Leksfalztrichter.
  • the control device 12 the cutting register also control or regulate that controlled the web length of at least one of the partial webs in response to the detected by the optical detection device 11 position of the printed image or is regulated by one or more in each case one of the sub-webs conductive register rollers are changed in their respective position by the output from the control device 12 signal s, whereby the respective track length of at least one of the sub-webs relative to another Part track changed, wherein the correlating partial webs the same cutting device or perforating, z. B. in the folder 22, are supplied.
  • the difference between a cutting position given by the nominal value and a position of the printed printed image detected by the optical detecting device 11 defines a cutting position deviation which is e.g. B. can be determined by the fact that from the known from the prepress print image in the transport direction of the printing material, a first profile, z. B. a brightness profile of the digital image content, created and compared with a created in the printing process from the currently acquired print image similar second profile, ie, for example, with a brightness profile of the digital image content, with an offset between the two profiles correlated with the cutting position deviation.
  • the determined cutting position deviation is then used to control the cutting device or perforating device.
  • the control device 12 can also be used for controlling or regulating a so-called string register by z. B. the phase angle or angular position between the participating in the pressure of the individual webs or partial webs of the strand form cylinder 08 and / or transfer cylinder 14 is changed relative to each other, so that the position of the printed on the individual webs or partial webs of the strand printed images changed relative to each other.
  • the individual printed respectively with a printed image webs or partial webs of the strand are then brought together and stacked so that in their common cut or their common perforation by cutting or perforating the strand, the printed images of the respective webs or partial webs come to lie one above the other in the correct position and none of Print images will be damaged during cutting or perforation due to a cutting position deviation.
  • it may be provided on a web-fed printing press that in turn preferably with a signal s of the control device 12 z.
  • a web catcher or a Brukappungs is brought to a standstill, when the controller 12 from the data of the optical detection device 11 due to a significant deviation of the currently recorded printed image recognize, from its expected position, a web break or other serious disruption in the production performed by the printing press.
  • the web catching device may have at least one catching roller.
  • the Bahnkappungs worn has z. B. on a discount knife.
  • the significant deviation of the position of the printed printed image may be in excess of a preset threshold.
  • the controller 12 may send a signal s to a controller when the controller 12 detects a hole in the substrate from the data of the optical detector 11.
  • the control device 12 determines z. B. Furthermore, a change in a distance between two transversely to the transport direction of the printing material in the distance or at least in their respective position not congruently arranged marks or fields, the optical detection means 11 detects the two respective same color separation associated brands or measuring fields preferably simultaneously and the control device 12 as a function of the determined change in the distance with the actuator 07, the at least one machine element 08 sets. In this way, interference can be counteracted by fan-out, ie a width change of the printing material during the printing process. If the printing press has a dryer, through which the substrate is passed after the application of ink, the detection device 11 z. B. after a dryer, ie at the output, be arranged.
  • control device 12 carries out the process of adjusting the at least one machine element 08 in the pressure continuously, wherein the control intervention preferably takes place when a permissible tolerance limit is repeatedly reached or exceeded by currently detected actual values.
  • the permissible tolerance limit can be z. B. allow deviations from the setpoint of 10%.
  • the permissible tolerance limit can also be specified z. As a positional deviation of the halftone dots of less than 10 .mu.m, as a colorimetry error of .DELTA.E.gtoreq.3 or as an error accuracy of the optical density of .DELTA.D> 0.02, this last tolerance value is based thereon, which tonal fluctuations are typically still straight can be perceived. Minor tone value fluctuations are virtually no longer perceived by the human eye as a non-uniform application of color and therefore also require no control intervention by the control device 12.
  • the regulator 12 provided as a reference available setpoint of the quality of the pressure is z.
  • data is taken from a precursor precursor to printing or a reference substrate transported prior to printing by the printing press.
  • the desired value of the quality of the pressure with at least one input means of the control device 12 may have been entered prior to printing, so that the control device 12 can take the setpoint from this input data.
  • the input of the setpoint value defining data may be the meeting of a selection from a set of data by the setpoint z. From a set of defaults according to the current application. It can also be provided that at least one actual value of printing material previously printed in the printing press the target value for in the printing press Subsequent printed substrate forms.
  • control device 12 can be designed as an adaptive, self-learning system.
  • control device 12 displays the difference between the desired value and the actual value on a display device, outputs an acoustic and / or optical warning message in the case of a difference between the desired value and the actual value and / or the difference between the desired value and the actual value registered and logged.
  • the holistic detection of the quality of the print by the optical detection device 11 facilitates a protocol which is preferably produced over all produced copies of the print and which can be used by the printer as proof to the client.
  • the controller 12 sets at a difference between the setpoint and the actual value with the actuator 07, the at least one machine element 08 only after a release by an operator in a manner minimizing the difference.
  • the control device 12 sets the at least one machine element 08 automatically in a manner minimizing the difference. It can be provided that the control device 12 adjusts the at least one machine element 08 with the actuator 07 only when the difference between the desired value and the actual value reaches or exceeds a predetermined threshold value.
  • the control device 12 is integrated in a control room belonging to the printing press.
  • the at least one machine element 08 adjusting actuator 07 is z. B. as an electrical, as a hydraulic or as a pneumatic drive, wherein the actuator 07 z. B. is electrically operated.
  • a separate actuator 07 is provided for each adjustable machine element 08, wherein the actuators 07 different machine elements 08 of the control device 12 are independently adjustable.
  • At least the optical detection device 11, the control device 12 and at least one of the actuators 07 are connected to a common data bus.
  • the printing machine described above thus has as an adjustable with respect to the quality of the pressure machine element 08 z.
  • As actuators 07 z. B. individual drives for the cylinders and / or rollers, an adjusting device for an inclined position of the cylinder, an adjusting device for adjusting a force exerted between rollers contact pressure and / or a control device for controlling a roller existing between relative speed.
  • each of these machine elements 08 made with the respective associated actuator 07 has a direct effect on the quality of the print
  • the optical detection device 11 sensing the quality of the print currently produced by the printing press preferably continuously or at least in a fast cycle and correlates with the quality of the pressure correlating data of the control device 12, which in turn with at least one actuator 07 at least one of the machine elements 08 as a function of a difference between a specified as the setpoint quality of the pressure and the detected as the actual value of the optical detection means 11 quality of the pressure in a manner that minimizes this difference between the setpoint and the actual value.
  • the machine elements 08 of the printing press act, on the one hand, on the position, which can be determined by coordinates, of screen dots printed on the printing substrate, namely on the position of the screen dots relative to a reference line of the printing material, the reference line being e.g. B. may be a lateral edge of the printing material, and / or on the location of halftone dots of different printing ink, which occupy these grid points relative to each other.
  • the machine elements 08 of the printing machine influence the color appeal of the printed printing inks, ie their physically measurable, colorimetric properties, both for a single printing ink and in cooperation with other printing inks participating in the construction of the same printed image. Properties of the printing material also have an effect on the position of screen dots printed on the printing substrate and their color appeal, which is why these are advantageously to be included in the control circuit regulating the quality of the printing.
  • a matrix of parameters that can be combined with each other, with certain combinations of the pressure on the quality settings for adjusting the quality of the pressure z. B. in the pressure of the printing machine and to stabilize the quality of the print at the set level, particularly in the production of the printing press are particularly advantageous because they occur during printing, z. B. wear-related, thermal or climatic disturbing influences that affect the reproducibility of the quality of the pressure and thus the controlled system 09 negative, particularly effective counteract. Wear-related interference influences arise on the machine elements involved in the pressure, thermal interferences have an effect on the printability of the participating inks and climatic disturbances such as ambient temperature and humidity influence the printability of the printing material.
  • All these disturbances can affect the quality of the print in any, usually unpredictable combination and intensity, ie they impair, so that a continuous control of the quality of the print is advantageous.
  • the timing of the individual disturbing influences can be very different and vary from slow to fast variable or oscillating.
  • the disturbing influences in the pressure can occur uniformly or unevenly and thus have a stochastic distribution.
  • All disturbances acting on the controlled system 09 are provided with the reference numeral z, irrespective of their respective cause, their respective time behavior or their area-dependent effect on the pressure in FIG.
  • the data output by the optical detection device 11, which correlate with the detected quality of the pressure and form a controlled variable x for the control device 12, are designated in FIG. 3 together with the reference symbol x regardless of their physical nature.
  • the setpoint supplied to the control device 12 as a reference variable w is indicated by the reference symbol w in FIG.
  • the control device 12 acts with a in Fig. 3 summarized by the reference numeral y provided signal y at least on an actuator 07 of the control loop, but they can also in particular additionally another with the reference symbol s signal s deliver to one or more other control devices ,
  • the at least one machine element 08 is a tempering for controlling at least part of a lateral surface of a rotating body of the printing machine, wherein the rotational body is involved in the transport of a printing ink to the printed in the printing machine with the printing substrate, because with the tempering influence on the theological properties of the printing ink.
  • the actuator 07 is an actuator for setting a relative to the printing material inclined position in the Printing machine arranged forme cylinder 08 is because it can be counteracted the "cocking" effect.
  • the actuator 07 when printing multiple inks on the same substrate at the printed inks their Tackwert each set differently to allow a Ubruckttik with good adhesion of printing inks involved in printing.
  • the controller 12 in a determination of a difference between the desired value and the actual value, a change in a distance between two transversely to the transport direction of the printing material in the distance or at least in their respective position not congruent arranged marks or measuring fields determined, wherein the optical detection device 11 detects the two respective same color separation associated brands or fields simultaneously, the control device 12 depending on the determined change in the distance with the actuator 07, the at least one machine element 08 adjusts z. B. counteract the fan-out and compensate for its interference at least partially.
  • the machine element 08 is a metering device of an inking unit 13 for metering the amount of ink to be transferred to the printing material by the amount of ink to be transferred to the printing material by adjusting its layer thickness and / or their duration of application.
  • the layer thickness of the ink applied to the substrate is z. B. in the range between 1 micron and 3 microns.
  • the ink-carrying rollers and cylinders, in particular the rollers of the inking unit 13, of a control device provided for this purpose are initially set in relative position relative to each other as a function of the production speed of the printing press against each other and then starting from this speed-dependent positioning of the control device 12 as a function of the detected by data of the optical detection device 11 currently produced quality of the print be managed.
  • the speed-dependent positioning of at least one of the ink-guiding rollers and cylinders in their relative position to another roller or to another cylinder thus forms a basic setting which forms an initial level for control associated therewith depending on the currently produced quality of the print.
  • the speed-dependent positioning of the ink-guiding rollers and cylinders in their relative position to each other can, for. Example, by attached to the rollers preferably remotely operable roller locks, wherein the roller associated with a roller locks cause their actuation the roller in question to a radial stroke and thus change the position of this roller relative to at least one further adjacent roller. If out of the data provided by the optical detection device 11 z. B. can be removed, that the currently performed by the rollers amount of ink for the quality of the printed product to be produced is not suitable, the controller 12, the position of one or more color-guiding rollers or cylinders in the current printing process change again, ie to achieve a good Track the quality of the print.
  • a roller lock is preferably provided in each case at both ends of each of these rollers or cylinders, each roller lock having at least one actuator, but preferably a plurality of actuators, wherein the preferably remotely actuable actuators z. B. are formed as acted upon by compressed air pressure chambers and are arranged such that an adjustment of the associated roller or the associated cylinder is possible at least in two directions.
  • the roller lock may externally act on one of the ends of the associated roller or the associated cylinder, but it may also be inside this Roller or cylinder may be arranged, although it causes the roller or the cylinder to a radial stroke in any case upon actuation of its actuators.
  • the control device 12 is supplied with a signal p which informs the control device 12 which of the printing units 01 are involved in the current printing process and / or which printing group 01 from the current printing process is disconnected.
  • the control device 12 can determine which one of the printing units 01 associated machine element 08, z. B. which metering device of the printing units 01 associated inking unit 13 for metering a quantity of the ink to be transferred to the printing ink, by an actuation of its actuator 07 can influence the currently produced quality of the print.
  • a printing ink other printing ink 01 can be set in this way in a shorter time to a favorable for the quality of the print value by z.
  • the optical detection device 11 senses the quality of the print currently produced by the print engine and supplies data correlating with the quality of the print to the control device 12, which in turn receives a detected actual value is adjusted with a predetermined setpoint value and the current setting of at least one machine element 08 so new sets or nachhow that the currently produced quality of the pressure is brought to the setpoint and held there as possible.
  • the control device 12 thus examines the data of the optical detection device 11 with respect to the presence of a disturbing influence and analyzed in the presence of a disturbing influence the data in terms of its cause, timing and / or surface pressure.
  • the control device 12 sends at least one signal y to an actuator 07 in order to counteract the interference.
  • the signal y can therefore be very complex in terms of data technology and act on a plurality of actuators 07, which may also apply to the signal s for controlling a control device connected to the control device 12.
  • At least one of machine technology and at least one machine element 08 which acts on the properties of the material involved in the printing, in particular the ink, is preferably provided independently of each other by at least one actuator 07 of the control device 12 corresponding to from those of the optical Detector 11 detected data resulting need to be used.
  • control device 12 by integrally detecting the quality of the pressure with the optical detection device 11 to analyze the received data according to different criteria and output as a generated from the analysis control intervention in the controlled system 09 a signal y that various actuators 07 and / or Machine elements 08 in common, d. H. at the same time or at least coordinated with one another, leads to actions which, in their combination, counteract synergistically different disturbing influences on the pressure.
  • the controller 12 does not respond to singular disturbances, but evaluates their behavior on the pressure in their overall impact. An undesirable under- or overreaction of individual actuators 07 and / or machine elements 08 can thus be minimized.
  • the holistic detection of the quality of the printing with the optical detection device 11 does not necessarily mean that the optical detection device 11 basically detects all the characteristics of the printing, but rather refers to those properties of the print that the performer of the print has assured his client and whose Compliance is therefore to be monitored.
  • the quality of the print is preferably detected close to the place of its production with the optical detection device 11 and several, preferably all relevant disturbance variables are determined from the data acquired simultaneously and preferably continuously evaluated in real time, a fast-acting control is possible, so With regard to the pressure, a stable operating state with a good quality can already be achieved after a very short time, which leads to a low start-up waste due to a short reaction time of the control device 12 and can be maintained in the production pressure.
  • the processing, evaluation and storage of the By the optical detection means 11 accumulating amount of data requires a preferably electronically formed control device 12 with a high process speed, wherein different, detected from the data of the optical detection device 11 disturbances in the control device 12 are preferably evaluated in mutually parallel process branches.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

L'invention concerne des machines à imprimer comprenant au moins un élément ajustable avec un élément de réglage. L'ajustement de l'élément de machine (au moins au nombre de un) agit sur la qualité d'une pression exercée par la machine à imprimer. Un dispositif de détection optique, muni d'un capteur dirigé sur la surface d'une matière d'impression imprimée dans la machine à imprimer, détecte la qualité de la pression. Un dispositif de régulation qui reçoit des données provenant du dispositif de détection optique ajuste conjointement avec l'élément de réglage, l'élément de machine (au moins au nombre de un), en fonction d'une différence entre une qualité de la pression, prédéterminée comme valeur théorique, et la qualité de la pression, détectée par le dispositif de détection optique, comme valeur réelle, d'une manière minimisant la différence entre la valeur théorique et la valeur réelle. La régulation repose sur le fait que la qualité de la pression est détectée dans son intégralité par le dispositif de détection optique et que ses données concernant des influences perturbatrices agissent sur la qualité de la pression.
EP05717090.4A 2004-03-23 2005-03-17 Machines a imprimer comportant au moins un element ajustable a l'aide d'un element de reglage Not-in-force EP1727676B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102004014533 2004-03-23
DE102004035787 2004-07-23
DE102004049079 2004-10-08
PCT/EP2005/051234 WO2005092613A2 (fr) 2004-03-23 2005-03-17 Machines a imprimer comportant au moins un element ajustable a l'aide d'un element de reglage

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EP1727676A2 true EP1727676A2 (fr) 2006-12-06
EP1727676B1 EP1727676B1 (fr) 2014-01-22

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EP05102102A Active EP1579992B1 (fr) 2004-03-23 2005-03-17 Machine d'impression avec au moins un encrier

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US (1) US7464645B2 (fr)
EP (2) EP1727676B1 (fr)
CN (1) CN101090821B (fr)
ES (1) ES2387567T3 (fr)
PL (1) PL1579992T3 (fr)
WO (1) WO2005092613A2 (fr)

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EP1579992A1 (fr) 2005-09-28
EP1579992B1 (fr) 2012-06-06
WO2005092613A2 (fr) 2005-10-06
US7464645B2 (en) 2008-12-16
ES2387567T3 (es) 2012-09-26
CN101090821B (zh) 2010-11-03
WO2005092613A3 (fr) 2006-06-01
US20070144375A1 (en) 2007-06-28
PL1579992T3 (pl) 2012-10-31
EP1727676B1 (fr) 2014-01-22
CN101090821A (zh) 2007-12-19

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