EP2888109A1 - Procédé et dispositif d'orientation de plaques d'impression sur des cylindres d'impression - Google Patents

Procédé et dispositif d'orientation de plaques d'impression sur des cylindres d'impression

Info

Publication number
EP2888109A1
EP2888109A1 EP13731136.1A EP13731136A EP2888109A1 EP 2888109 A1 EP2888109 A1 EP 2888109A1 EP 13731136 A EP13731136 A EP 13731136A EP 2888109 A1 EP2888109 A1 EP 2888109A1
Authority
EP
European Patent Office
Prior art keywords
printing
cylinder
plate
positioning
plates
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.)
Withdrawn
Application number
EP13731136.1A
Other languages
German (de)
English (en)
Inventor
Wolfgang Kasper
Marcus HACK
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.)
Ardagh Metal Beverage Europe GmbH
Original Assignee
Ball Europe GmbH
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
Application filed by Ball Europe GmbH filed Critical Ball Europe GmbH
Publication of EP2888109A1 publication Critical patent/EP2888109A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/005—Attaching and registering printing formes to supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/20—Rotary letterpress machines specially adapted for proof printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/90—Register control

Definitions

  • the invention relates to a method and an apparatus for aligning printing plates on printing cylinders.
  • the invention relates to a method and apparatus for aligning printing plates on printing cylinders of a printing press for printing on the outer surface of a beverage can body, in particular in the high pressure process.
  • the scope of the invention relates in particular to the printing of beverage cans, in particular the printing of a cylindrical printing surface of a beverage can, in particular of tinplate or aluminum with a printed image.
  • a beverage can Under a beverage can is here a beverage can body with a bottom, a cylindrical shell and an open end, which is opposite to the ground understood.
  • Such beverage cans are usually assembled in pallets and supplied to bottling companies, which fill the beverage can through the open end with a drink and close after filling the open end with a beverage can lid, so then there is a filled, sealed beverage container.
  • the open end of a beverage can is preferably retracted and provided with an outwardly bent flange, so that a beverage can lid can be connected by crimping with the outwardly bent bead of the open end of the beverage can.
  • Beverage cans are preferably made of tinplate or steel or aluminum.
  • the printing of a beverage can is usually part of the overall production process of a beverage can.
  • the overall manufacturing process of a soda can typically involves cutting out a blank and deep drawing a cup which is then stretched into a can body, trimming or trimming the open end, washing the beverage cans to remove excess leveling agent, applying various coatings, such as UV coatings, as well as interior, exterior and Bodenlackierun- gene, - optionally multiple - drying after one or more process steps, the retraction of the open end and an inspection, for example, for testing for holes and crimping cracks , and palletizing.
  • a printed image is preferably applied, which has a graphic design that is intended to appeal to a user.
  • graphic elements having an information character, for example information about ingredients, deposit tokens, shelf life or production data, identification numbers or the like, may be arranged in the print image.
  • Such a printed image is usually applied to the cylindrical printing surface of a beverage can by a printing process. It is known, for example, to print beverage cans in the high-pressure process.
  • printing presses are generally used with at least one, but usually a plurality of printing cylinders, on which printing plates are positioned.
  • the cans to be printed are usually mounted by means of vacuum on circularly arranged mandrels of a rotary clock machine and set in rotation about their own axis.
  • inking units individual colors are transferred via ink fountain, rollers and printing cylinders with printing plates arranged thereon to printing blankets.
  • the printing plates which can also be referred to as high-pressure clichés, take color from the color providing inking color only at the points where they are increased, and transfer this color to the blanket.
  • On the blanket all colors required for the printed image are mirror images applied.
  • a can carried by a mandrel unwinds against the blanket synchronously and takes over from the blanket the printed image. By unrolling the can on the blanket, the colors of the printed image are transferred to the can and the printed image becomes positive.
  • the so-called registration accuracy i. the exact relative orientation of the printing plates is not e.g. with the help of known from sheetfed printing, not on the actual printed image belonging sheet edges arranged register crosses or the like can be measured and corrected on the basis of such measurements. Rather, the registration accuracy is determined stepwise by trial prints and corrected by trial and error until the desired print image results in the desired quality.
  • the register accuracy is also determined by the pressure of the blanket (blanket) on the can to be printed. The respectively required pressure force depends in turn on the respective print image.
  • US 5,065,677 teaches the orientation of a printing plate to a printing cylinder, wherein a reference point on the printing plate is detected by a camera and positioned by means of an alignment unit in a certain position relative to a rotatably mounted printing cylinder and applied thereto.
  • One or more printing plates can be successively applied to the printing cylinder, whereby recognition of the respective reference point on the printing plate takes place for each of the printing plates, the printing plate is aligned on the reference point and then applied to the printing cylinder. Finally, a proof is created by which the accuracy of the orientation of the plates can be checked.
  • EP 1 593 505 B1 discloses a method for rapid position control of a printed image on a printing form, wherein the printing form is provided with punch punches and is applied before positioning on a printing cylinder with the punch punches on dowel pins of a measuring arrangement.
  • markers are then detected on the printing plate and stored their location by means of a camera.
  • the data determined in the measuring arrangement serve (for printing plates with acceptable deviations) to correct the position of the printing plates on the printing cylinders, for example, by moving or manually moving appropriate dowel pins on the printing cylinders of the printing press.
  • EP 1 826 004 A2 additionally provides that a transponder is arranged on the printing plates, in which the measurement data and optionally further data can be stored so that each printing plate carries the data determined for it on the transponder and also over greater distances can be read without contact and based on the individual pressure plate and also a confusion of the printing plates can be prevented.
  • EP 2 106 910 B1 covers not only tolerances and inaccuracies of the printing plate but also position correction data of the plate or printing cylinder itself. The position correction data of the printing cylinders can be read into a computer device or already stored there.
  • a method for aligning printing plates on printing cylinders outside a printing press comprising the steps of: determining predetermined first and second positions based on previously determined, impression cylinder individual correction values for a first and a second pressure cylinder, arranging the first pressure cylinder outside a printing press in a first receiving position, providing a first printing plate, positioning the first printing plate on the first printing cylinder in a predetermined first position, detecting first position data of the first printing plate positioned on the first printing cylinder, arranging the second printing cylinder outside a printing machine accordingly a second receiving position, providing a second printing plate, positioning the second printing plate relative to the second printing cylinder in a predetermined second position, detecting second Posi Checking the first and second position data based on the predetermined first and second position, possibly correcting the positioning of the first and / or the second pressure plate, if the result of the check is negative.
  • At least one correction value is first determined for each printing cylinder, which contains at least information about a respective individual, precise, in the range of a fraction of a millimeter, for example in the range of 1/100 mm, alignment of a respective printing cylinder in the respective printing unit ,
  • the invention includes, inter alia, the recognition that a considerable amount of time can be saved for a print image or decorative change when the process of aligning the printing plates on the printing cylinders outside the printing press can be made.
  • the printing press can be used during operation in a printing machine with a first set of printing cylinders on which printing plates for a first printed image are arranged.
  • printing plates for a second printed image can be arranged and aligned outside the printing press, for example on a second set of printing cylinders.
  • Another underlying realization of the invention is that an alignment is not made to the pressure plate to the respective printing cylinder, but position data of the printing plates aligned with each other and then the position is corrected if necessary.
  • These deviations of the relative positioning of the printing plates to each other can be detected with existing solutions only in proof and then has to be done consuming by readjusting the printing cylinder in the printing press, with the known disadvantages in terms of downtime and rejects.
  • the printing result of the first printing after installation of the printing cylinders in the printing press can be significantly increased, thus avoiding the expense of readjustment or at least reduced.
  • impression cylinder-individual correction values are determined for a first and a second impression cylinder. From these impression cylinder individual correction values, predetermined first and second positions for positioning the first and second printing plates on the first and second impression cylinders are derived. It is preferred that correction values for a plurality of printing cylinders, in particular all printing cylinders of a printing press, are determined and from this predetermined positions for all printing plates to be arranged on the printing cylinders are derived.
  • the printing cylinder-individual correction values may include printing cylinder-specific correction data, and printing plate-specific correction data may also be included in the predetermined position.
  • printing cylinder-specific correction data may include printing cylinder-specific correction data, and printing plate-specific correction data may also be included in the predetermined position.
  • Such a consideration of correction values in the alignment or positioning via a corresponding change in the predetermined position or the position of the printing plates can also be referred to as software-based correction.
  • Printing cylinder-specific correction values can contain, for example, information as to whether an offset or so-called offset of a printing cylinder in the printing machine relative to the pickup position exists. For example, due to wear, it may happen that an original position of a printing cylinder in a printing press changes over time and the actual position of the printing cylinder no longer coincides with this original position. However, if the pickup position in which the impression cylinder is placed prior to starting the registration of the printing plate now corresponds to the original position of the printing cylinder in the printing press, then the printing plate will not be optimally aligned with the final printing when the printing cylinder is installed in the printing machine because the printing cylinder in the printing press has an offset from its original position or the recording position.
  • the correction values can be used in aligning the printing plates by changing the predetermined position of a printing plate according to the correction values.
  • the receiving position of the printing cylinder before the orientation of the printing plates remains unchanged, but the printing plate is not placed in the original intended position, which is aligned to the original position of the printing cylinder in the printing press, but in a corrected predetermined position, which the actual position considered the printing cylinder in the printing press.
  • the printing cylinder-individual correction values may be mechanically caused, resulting from the printing press correction values, and take into account, for example, caused by wear of the cylinder shots offset or changes due to the replacement of inking.
  • printing cylinder-individual correction values can also be process-related correction values, which can result, for example, from the proof values (depending on the specific printing surface), the quantities of ink to be applied, the printing speed or the blanket used (blanket).
  • the printing cylinder-individual correction values are preferably stored in a database.
  • correction values it is possible to take into account, for example, the offset data used in an optimally adjusted printing process in the printing press. Furthermore, printing cylinders with applied printing plates, with which a particularly good or optimal printing result has been achieved, are introduced into an alignment device described here and there detected from the arrangement of the printing cylinder on the recording and the arrangement of the printing plate on the printing cylinder and derived therefrom correction values, which can then be used to determine a predetermined position of another, to be arranged on this printing cylinder pressure plate.
  • the method provides that a first impression cylinder is arranged outside a printing press in a first receiving position.
  • the receiving position of the printing cylinder outside the printing press preferably corresponds to a printing press position of the printing cylinder within a printing press.
  • the arrangement of a printing cylinder in the receiving position is preferably carried out on a receptacle which is adapted to receive the printing cylinder, for example through a wave.
  • the receptacle is preferably translationally and rotatably movable, optionally driven by servomotors, to set a specific receiving position of the printing cylinder.
  • the positioning device is driven by a drive, in particular by one or more servomotors.
  • such a receptacle substantially corresponds to a receptacle for the impression cylinder within a printing press.
  • the first receiving position is a specific, reproducible position of the first printing cylinder to the recording and is preferably set with respect to a coordinate system.
  • a first printing plate is provided and then positioned on the first printing cylinder in a predetermined first position.
  • the positioning of the first printing plate on the first printing cylinder described in more detail below can preferably also be used for positioning the second and optionally further printing plates on a second and possibly further printing cylinders.
  • the predetermined position of a printing plate is preferably defined with respect to a coordinate system relative to the respective printing cylinder and includes printing cylinder individual correction values and in particular indicates the exact, desired position of the printing plate on the printing cylinder. If the printing plate is arranged according to the predetermined position on the printing cylinder, preferably no subsequent correction of the position is required.
  • the positioning preferably takes place via a positioning device. It is further preferred that the first printing plate is first positioned relative to the first printing cylinder according to a predetermined first position and then placed or placed in this predetermined first position on the first printing cylinder.
  • the positioning device preferably used for this positioning can be, for example, a support table.
  • the positioning device is preferably defined in its relative position to a pressure cylinder arranged on the receptacle in a receiving position, ie preferably the position of the receiving table relative to the receptacle is known.
  • the positioning device is designed to be movable, in particular at least in two orthogonal directions of a plane, preferably a horizontal plane.
  • a pressure plate arranged on the positioning device can be aligned both translationally and rotationally.
  • the positioning device is preferably drivable, in particular by a servo motor formed.
  • the positioning device is divided into two, wherein each of the two parts is separately movable and drivable, preferably by a servo motor is formed.
  • the printing plate After successful positioning of the printing plate relative to the printing cylinder in the predetermined position, the printing plate can then be placed in this predetermined position on the printing cylinder, that is arranged or placed on this.
  • the pressure plate is first applied according to an approximate position preferably on the positioning device and then detected and detected in this position.
  • a control device is preferably used, which preferably comprises a camera or image recognition system, and further preferably designed and arranged to recognize a reference mark, for example, a coding or an image portion of the printing plate and deduce therefrom a current position of the printing plate relative to the printing cylinder and to match this current position with the predetermined position, ie a defined target position.
  • this current position of the printing plate does not coincide with the predetermined position of the printing plate, preferably corresponding additional correction values are determined and the position of the printing plate is correspondingly changed or corrected.
  • the correction values are preferably transferred from the control device to the positioning device, so that the positioning device changes the position of the pressure plate relative to the pressure cylinder by means of corresponding movements derived from the correction values. After such a change or correction of the position of the printing plate, the new position is again recognized by the control device or the image recognition or camera system and compared again with the predetermined position.
  • a control in the sense of a control loop with position detection and position correction takes place until the current position of the printing plate relative to the printing cylinder corresponds to the predetermined position, preferably in the control device. Only then is preferably the printing plate placed or arranged according to this predetermined position on the printing cylinder. Preferably, the correct positioning of the printing plate arranged on the printing plate can then be checked again by the control device, preferably by the same or an additional image recognition or camera system.
  • the positioning of the printing plates in their predetermined positions preferably takes place with a deviation of less than a tenth of a millimeter, especially with an accuracy of plus / minus five hundredths of a millimeter, especially with an accuracy of plus / minus two hundredths of a millimeter.
  • This preferred embodiment of the process of positioning a printing plate relative to a printing cylinder described herein and arranging the printing plate on an outer surface of the printing cylinder may preferably be the same for both the first printing plate and the first printing cylinder and for a second printing plate and a second printing cylinder as may be used for further printing plates and other printing cylinders.
  • the placement of the printing plate on the printing cylinder after successful positioning relative to the printing cylinder in the predetermined position can preferably be facilitated by a specific design of the positioning device or a device for aligning printing plates.
  • a first part of the support table can be removed such that a first part of the printing plate can be placed or placed on the printing cylinder, i. H.
  • a counter-cylinder in the form of a Anwalzrolle is preferably provided, which is movable relative to the impression cylinder and can roll the first part of the printing plate on the printing cylinder.
  • the second part of the printing plate is preferably arranged or placed on the printing cylinder by the printing cylinder is rotated and pulled the printing plate between the printing cylinder and another counter-cylinder in the form of a pressure roller of the positioning on the outer surface of the printing cylinder by the rotation of the printing cylinder becomes.
  • the positioning of the first printing plate on the first printing cylinder is preferably stored by detecting the position data.
  • a second printing cylinder is arranged according to a second recording position outside a printing press. This is preferably done on the same recording on which the first printing cylinder was previously arranged and which was removed from the recording prior to the arrangement of the second printing cylinder. Furthermore, a second printing plate is provided. The characteristics of the second printing cylinder, the second printing plate and the second recording position correspond to preferred example, those of the first printing cylinder, the first receiving position and the first pressure plate.
  • the second pressure plate is positioned relative to the second pressure cylinder in a predetermined second position.
  • the positioning processes described above with reference to the first printing plate in particular by means of a positioning device designed as a support table, are preferably used correspondingly also for the positioning of the second printing plate.
  • the second printing plate Before the second printing plate is placed and placed on the second printing cylinder, its relative position to the printing cylinder is detected. These detected second position data are checked with the predetermined second position, preferably by comparison.
  • the predetermined first position and the predetermined second position are preferably set relative to each other, i. H. in particular identical or provided with a specific translational and / or rotational offset.
  • the detected second position data After detecting the second position data, the detected second position data are compared with the predetermined second position and it is checked whether the actually detected position data coincides with the predetermined position. If this is not the case, a correction of the positioning of the second printing plate takes place.
  • a correction information is preferably determined from the examination of the second position data on the basis of the first position data, on the basis of which then the positioning of the second pressure plate is corrected, preferably in a process according to the preferred procedure for positioning the printing plate as described above, in particular by moving a Positioning device on which the pressure plate is arranged.
  • the second printing plate is also placed on the second printing cylinder, preferably in accordance with the steps and means described above as preferred.
  • the real position of the applied first and second pressure plate can preferably be adjusted again with the predetermined first and second position and, for example, a warning signal are issued when the deviation exceeds a predetermined tolerance value, for example 2 / 100mm. If the deviation is too large, the pressure plate again removed from the printing cylinder and the positioning process for this printing plate are repeated.
  • the method may be preferable to include the following steps in the method: checking the second position data based on the first position data, and optionally correcting the positioning of the second pressure plate if the result of the check to the first pressure plate is negative.
  • the real position of the second printing plate placed on the second printing cylinder (determined by the second position data) is compared with the real position of the first printing plate (determined by the first position data).
  • This check of the real positions can also be applied correspondingly for more than two impression cylinders and printing plates by further printing plates are aligned relative to other printing cylinders as described above, preferably then also the respective further position data on the basis of the first position data or the respective previous position data are checked and wherein furthermore preferably the further impression cylinders with the further printing plates arranged thereon are arranged corresponding to the further receiving positions in a printing press.
  • the method according to the invention has the advantage that the printing plates are already aligned outside the printing machine exactly and taking account of printing cylinder-individual correction values, so that no further registration is required after installation of the printing cylinder with printing plates positioned thereon in a printing press. As a result, set-up times for print or decoration changes can be significantly reduced. Another advantage is the reproducibility of the settings that are required for a particular print image.
  • the inventive method eliminates mechanical positioning aids such as pins, punched punches or stops. Since the positioning is preferably carried out by the detection of a reference mark, such as a picture element or a code on the respective printing plates and - in a known position of the printing cylinder in the pickup position - the detected position of the respective printing plate is aligned with a predetermined position and the current position is corrected until it coincides with the predetermined position.
  • a reference mark such as a picture element or a code on the respective printing plates and - in a known position of the printing cylinder in the pickup position - the detected position of the respective printing plate is aligned with a predetermined position and the current position is corrected until it coincides with the predetermined position.
  • the method is developed by the step of arranging the first and second printing cylinders with first and second printing plates arranged thereon corresponding to the first and second recording positions in a printing press, respectively.
  • a particular advantage is obtained if, after the accurate and in particular as described also relative alignment of the printing plates not only to the respective Druckzy- cylinder, but also to each other finally mounted on the printing cylinders printing plates are installed in a printing press to record there the pressure. Since in this case only the time for the installation of the printing cylinder and possibly a previous removal of other printing cylinders is required, a printed image or decor change can be performed very quickly and easily and with reduced risk of injury.
  • the printing cylinders with the printing plates positioned thereon, preferably dimensionally stable are arranged in an offset printing press.
  • the offset printing method with dimensionally stable printing plates is particularly preferred for the printing of beverage can bodies, since the dimensionally stable printing plates are distortion-free flexible and thus distortion-free on a cylindrical surface of a body can be arranged.
  • Another advantage of dimensionally stable printing plates is their reusability, i. the possibility of repeated use of used printing plates.
  • printing plates are aligned and arranged on as many printing cylinders as required for printing.
  • the required number depends in particular on the amount of colors used for printing a desired print image.
  • a further preferred embodiment of the method is characterized by the steps of reading out identification data of the first printing cylinder, reading out identification data of the second printing cylinder, wherein the identification data respectively contain the first and second recording position.
  • identification data of the printing cylinders are used. These identification data are preferably used to uniquely identify a printing cylinder.
  • the identification data may include, for example, a unique identification number of a printing cylinder and / or information about the position of the printing cylinder in the printing press, associated inking units, etc. It is particularly preferred that the identification data include the receiving position of the printing cylinder.
  • the receiving position of a printing cylinder is preferably a specific position of the printing cylinder in the recording, which is clearly defined with respect to a coordinate system. This particular position information of the printing cylinder in which it is to be arranged in the receptacle before the alignment of the printing plate is preferably contained in the identification data.
  • the identification data of the printing cylinder can be stored, for example, in a memory device which is in communication with a device for aligning printing plates on printing cylinders and can be read out accordingly.
  • the assignment of the identification data to a specific printing cylinder can for example be done by a selection of the appropriate identification data set by a user or output after entering a specific printing cylinder identifier by a user of the system accordingly.
  • a printing cylinder it is particularly preferred for a printing cylinder to carry a recognition mark that can be detected by a user, but preferably by a detection device.
  • the data read in this case can either already contain the entire identification data or be linked to stored associated identification data, so that complete identification information is available for the further procedure.
  • the detection device may, for example, be an image recognition or camera system, and preferably be part of or connected to the control device.
  • the detection means may be the same image recognition or camera system used for the registration process of the printing plates.
  • each printing cylinder preferably also carries a position marker, with the aid of the exact alignment of the respective printing cylinder in (its) respective printing unit can be determined.
  • a respective printing cylinder correction value and thus finally the respective predetermined position for a printing plate on the respective printing cylinder can be determined.
  • the method further comprises the step of linking the identification data of the first or second printing cylinder with stored, certain correction values, preferably with the printing cylinder-individual correction values, for positioning the printing plates on the respective printing cylinder.
  • correction values preferably the impression cylinder-individual correction values which are taken into account in the orientation of the printing plates, are linked to the identification data.
  • the respective correction values can be made automatically available upon detection or identification of the printing cylinder, in particular to change the predetermined position by the correction values and / or after adjustment of the printing plate according to the predetermined position to change the position of the printing plate again by additional correction values.
  • the correction values are processed in a control device or control device and linked to the predetermined positions or forwarded to the positioning device as separate correction information.
  • correction value information about such an offset or offset, referred to here as correction value, can be linked to the identification data or is already contained in this identification data, this offset or offset during alignment of the printing plates in a particularly simple manner, preferably automated and / or software-based, be taken into account.
  • the first or second printing plate has an encoding, preferably a picture element and / or a 2D barcode, such as a DataMatrix code, a QR code, a MaxiCode or an Aztec code, which are used for positioning the first and second pressure plate is used.
  • an encoding preferably a picture element and / or a 2D barcode, such as a DataMatrix code, a QR code, a MaxiCode or an Aztec code, which are used for positioning the first and second pressure plate is used.
  • Such coding can be easily applied to the printing plate when applying the printing relief and be arranged in the printed image itself or at another location of the printing plate.
  • the encoding can be a simple picture element, such as a rectangle, or a more complex 2D barcode.
  • a data matrix code in the form of an RCC 9 code (Register Computer Control) can be used.
  • RCC 9 code Registered Computer Control
  • Such coding can easily and reliably be detected by a control device, for example an image acquisition or camera system, and evaluated with respect to the situation.
  • the position marking on a respective printing cylinder can also be a picture element or a 2D barcode, for example a data matrix code.
  • Further preferred steps of an embodiment of the method are simulating a printing with the first and second printing cylinders with positioned first and second printing plates outside a printing machine, displaying a simulation result, in particular in the form of a registration cross deviation and / or as a virtual printed image.
  • a virtual printing is performed outside the printing press, ie, the actual printing method and the printing result are simulated. This is preferably done using the detected position data of the printing plates arranged on the printing cylinders. In particular, together with information about the position of the printing cylinder in the printing press and the detected position data of the printing plates can be determined in this way, which result can be achieved in real pressure.
  • a specific color information is preferably linked for each printing plate on the basis of its position and preferably on the basis of information for the printing cylinder to which it is arranged via the corresponding inking unit, and thus a virtual first printed image, a so-called virtual first sheet or a virtual first dose, created.
  • This procedure can also be referred to as PDF synchronization, since the result is generated as a PDF document. If correction requirements are still detected during this simulation, these can also be addressed outside the printing press and accordingly corrected before the print cylinders are installed in a printing press and verified by a new simulation.
  • the reliability of the alignment process can be further increased and thus the accuracy of the ultimately occurring in the printing press printing process can be increased, so that the least possible rejects incurred in the actual printing in the printing press.
  • the step of determining and outputting a measure for correcting the positioning of the second printing plate is particularly preferred if the result of the checking and / or the simulation result is negative.
  • the automatic determination and issuing of corrective measures therefore has the advantage that it can be corrected in a targeted manner and with as few measures as possible.
  • Information on a corrective measure preferably contains the information as to which printing plate, for example the second, third or further, is or are to be corrected and which related position or position change, preferably by which movements of the positioning device, is to be undertaken in order to improve the result ,
  • a further preferred embodiment provides that the first and second pressure plate is held on the first and second pressure cylinders in the predetermined first and second position by magnetic force, preferably exclusively by magnetic force.
  • Such a magnetic attachment of the printing plates on the printing cylinders has the advantage that no mechanical position holding points or clamps for mounting the printing plates are required on the printing cylinder. In this way, the positioning of a printing plate on a printing cylinder is not fixed or limited by such mechanical breakpoints.
  • first pressure cylinder and / or the second pressure cylinder and / or one or more of the further pressure cylinder comprises or have a magnetic or magnetizable material.
  • a printing cylinder may have one or more permanent magnets or be formed as such.
  • a pressure cylinder may be formed as an electromagnet with a switched on and off magnetic field.
  • a printing plate relative to a printing cylinder there is only a small or no magnetic effect between the printing cylinder and the printing plate in order not to interfere with the aligning or positioning process as little as possible. Only after the alignment of the printing plate relative to the printing cylinder and just before the printing plate is then placed in this predetermined position on the printing cylinder and to be placed or placed on this, a corresponding magnetic effect is preferred.
  • the reduction of the magnetic effect during the alignment or positioning process can be done for example by insulation, a counteracting magnetic field or the switching off of a pressure cylinder designed as an electromagnet.
  • first pressure plate and / or the second pressure plate and / or one or more of the further pressure plates comprises or have a magnetic material, wherein preferably in the form of a sheet-steel carrier.
  • This embodiment of the printing plates makes them in a particularly simple and efficient manner suitable for attachment by magnetic force on a printing cylinder.
  • the step is furthermore preferably rounding of a first and / or a second edge of the first and / or second printing plate.
  • the rounding of the edges which is also referred to as tilting, a particularly clean printed image can be generated.
  • the step of rolling the first and second printing plates on the first and second printing cylinders, respectively, is preferable.
  • the rolling of the printing plate on the printing cylinder is preferred, in particular in combination with a fastening by means of magnetic effect. The rolling is preferably carried out so that a prior positioning of the printing plate is maintained in a certain position relative to the impression cylinder during rolling.
  • an embodiment of the method is preferred with the step of widening a perforation and / or punching or a plurality of perforations and / or punched passages of the first and / or second pressure plate, preferably by increasing the diameter of recesses of the perforation or perforations by at least 2 millimeters or by increasing the length and / or width of the punched hole (s) by at least 2 millimeters.
  • the method is also particularly applicable to printing plates and printing cylinders, which were originally designed for alignment or positioning by mechanical means, such as dowel pins.
  • the respective mechanical passport features of the printing plate are preferably widened in such a way that they have a greater tolerance relative to the respectively associated pass features of a printing cylinder and can therefore be positioned more flexibly with respect to these passport features of a printing cylinder.
  • the provision of the first or second pressure plate includes placing the first or second pressure plate on a support region of a support table. As already described above, it is preferred that the printing plates are applied to a positioning device at the beginning of the positioning operation, in particular to be placed on a support table.
  • the step of changing the first or second receiving position of the first and second printing cylinder by a first or second offset is provided. It is particularly preferred that the first or second identification data contain information about the first or second offset.
  • a so-called hardware-based correction can also be undertaken.
  • the recording position of the printing cylinder is corrected by the corresponding offset or offset before the beginning of the alignment process.
  • the printing plate is then positioned as described relative to the already arranged in a corrected recording position printing cylinder and applied thereto.
  • the aim and result of the software-based and the hardware-based correction are preferably the same:
  • correction information is provided first, in the result, namely the pressure plate positioned on a printing plate and the pressure achieved, this correction is already taken into account and not subsequently must be corrected.
  • the hardware-based correction While in the so-called software-based correction this is achieved solely by a change in the position data of the printing plate, the hardware-based correction also makes a change in the position of the printing cylinder, preferably by appropriate adjustment options on the recording.
  • an apparatus for aligning printing plates on printing cylinders outside a printing press comprising a receptacle for placing a printing cylinder outside a printing press in a receiving position, a positioning device for positioning a printing plate on one in the receptacle arranged printing cycle in a predetermined position, a control device for detecting position data of a printing plate positioned relative to a printing cylinder arranged in the receptacle, the control device being configured to obtain second position data from a second printing plate relative to one in the receptacle corresponding to a second printing plate
  • Receiving position arranged second printing cylinder is positioned to check on the basis of first position data from a first printing plate, which is positioned on a first printing cylinder arranged in the receptacle according to a first receiving position, and output a result of the review.
  • the positioning device comprises a support table, which is connected to the receptacle for the arrangement of a printing cylinder.
  • the positioning device comprises one, two or more counter-cylinders, which is or are designed and / or arranged to roll on a printing plate on a printing cylinder arranged in the receptacle corresponding to a receiving position. Furthermore, it is preferred that the positioning device and / or a rounding-off device is designed and arranged to contact a first and / or a second edge of one, two or more printing plate (s).
  • the device is preferably developed by the fact that the positioning device and / or a widening device is formed and arranged to widen one or more perforations and / or punch punches of the first and / or second pressure plate, preferably by increasing the diameter of recesses of the perforation or Perforations of at least 2 millimeters or by increasing the length and / or width of the pass punching (s) by at least 2 millimeters.
  • the device according to the invention and its further developments have features that make them particularly suitable for carrying out the method according to the invention and its further developments.
  • Figure 1 a cross section through a schematic representation of an exemplary
  • FIG. 2 a front view of the device according to FIG. 1;
  • FIG. 3 shows a first three-dimensional representation of the device according to FIG. 1;
  • FIG. 4 shows a second three-dimensional representation of the device according to FIG. 1.
  • the schematic representation of an exemplary embodiment of a device 100 according to the invention for aligning printing plates on printing cylinders outside a printing press is designed to carry out the method according to the invention for aligning printing plates on printing cylinders outside a printing press.
  • the device 100 has a bottom plate 102 and an outer cover 105.
  • the outer casing 105 designed as a touch screen control panel 40 is arranged.
  • frame racks 103, 104 are arranged for positioning various elements of the device 100.
  • a receptacle 120 is fixed in the form of a shaft on which a printing cylinder 1 10 is arranged in a receiving position.
  • the device 100 has a positioning device 200 on which, preferably manually by a user, a printing plate can be placed.
  • the positioning device 200 is here designed as a support table 210, which is designed to be movable via adjusting mechanisms 221 and 222.
  • the positioning device is in particular in two orthogonal directions in a plane, preferably a horizontal plane, movable, as indicated here by the four arrows of the adjustment mechanisms 221, 222.
  • the support table 210 is preferably formed in two parts, wherein each of the two parts 210, 212 is separately movable and driven, preferably by one or more servomotors, is formed.
  • the device 100 has an image recognition or camera system, which is equipped here with a total of three cameras 310, 320, 330.
  • the camera system is preferably part of a control device.
  • the cameras 310, 320 are mounted on the frame 103, 106 and movable. In Fig. 1, a possible alternative position of the camera 320 is shown at 320 '.
  • the cameras 310, 320 serve to detect a coding applied to a printing plate and to determine therefrom the position of the printing plate on the support table 210 relative to the printing cylinder 110.
  • the apparatus 100 preferably has a control device or control unit which is designed to evaluate the position of the printing plate on the support table 210 detected by the cameras 310, 320, in particular to compare it with a predetermined position and to determine correction values therefrom and with these correction values Actuate adjusting mechanisms 221 and 222 of the positioning device 200 so as to approximate the position of the printing plate on the support table 210 relative to the impression cylinder 1 10 of the predetermined position.
  • the support table 210 may be formed of a magnetically insulating material.
  • the pressure cylinder 1 10 may be formed as an electromagnet and preferably switched off during the alignment or positioning or an additional, a magnetic effect of the printing cylinder 1 10 counteracting, magnetic field be constructed.
  • the part of the pressure plate, which is on this first part 21 1 of the support table 210 has now rolled by the Anwalzrolle 140 on the mantle surface of the printing cylinder 1 10 rolled.
  • the Anwalzrolle 140 moves to vertically downwards in the direction of the printing cylinder 1 10 and preferably runs as long along the lateral surface of the printing cylinder 1 10 clockwise until the part of the printing plate has been completely rolled. Subsequently, the Anwalzrolle 140 moves back to its original position.
  • the pressure roller 130 down and further, the pressure cylinder 1 10 is set in a rotational movement in the clockwise direction , So that the second part of the pressure plate between the pinch roller 130 and the outer circumferential surface of the printing cylinder 1 10 by the rotational movement of the printing cylinder 100 from the support table 210 down and on the lateral surface of the printing cylinder 1 10 is pulled.
  • the camera 330 which is arranged and designed to detect position data of the printing plate after placing them on the printing cylinder 1 10 and / or position data of the printing cylinder to detect, preferably by reading a picture element or code on the printing cylinder. These data are also preferably stored and are available to the control device or control device.
  • the camera 330 For detecting the position of the pressure plate 1 10 positioned on the printing plate or the printing cylinder 1 10 itself, the camera 330, as shown in Figure 1, are displaced in the horizontal direction in the direction of the cylinder axis of the printing cylinder 1 10 along the frame 104.
  • the attachment of the printing plate on the printing cylinder 1 10 is preferably carried out exclusively by magnetic force.
  • a neutralized during the alignment or positioning of the printing plate, switched off or isolated magnetic field of the printing cylinder is effective when the printing plate is to be placed after alignment or positioning on the outer surface of the printing cylinder.
  • the process of aligning and positioning the second printing plate on a second printing cylinder is essentially as described above for a first printing plate and a first printing cylinder.
  • aligning and positioning a second or further printing plate on a second or further printing cylinder when aligning or positioning the printing plate, the current position of the printing plate compared with a predetermined position and, depending on this review, if necessary, the alignment or positioning is corrected.
  • the apparatus 100 further comprises two modules 50, 60 which serve to prepare the printing plates for the alignment and positioning device.
  • module 50 the edges of the printing plates can be pre-bent, in particular tipped or rounded. If necessary, existing perforations or punched passages or similar mechanical positioning aids can be widened in module 60 so that subsequent alignment and positioning can take place independently of the limitations represented by mechanical positioning aids.
  • the illustrated device 100 is designed to arrange a respective printing plate on a printing cylinder 1 10. After placing the printing plate on the printing cylinder 1 10 of the printing cylinder is replaced with a new printing cylinder, which in turn is then provided with a printing plate. After 10 printing plates are positioned and arranged on the printing cylinders, these printing cylinders 110 are preferably used in a printing press.
  • the device 100 shown here can be arranged, for example, in the vicinity of a production line for the production of beverage cans, preferably in the vicinity of a can printing machine or a so-called decorator.
  • all printing plates required for a particular print image can be placed on printing cylinders with the desired accuracy, outside a printing press and independently of the start of the production process of the cans with that particular print image. If then in the production line cans are to be produced with the specific printed image, in the can printing machine only an exchange of the printing cylinder against the already provided with the corresponding printing plates printing cylinder is required.
  • Already at the first start-up of the production line can be generated by the already with high accuracy on the printing cylinders and relatively aligned printing plates a high-quality print image without complex readjustments, which are associated with a high rejection, are necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Methods (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

L'invention concerne un procédé et un dispositif (100) d'orientation de plaques d'impression sur des cylindres d'impression (110). Le procédé comprend les étapes consistant à : déterminer des première et deuxième positions prédéfinies sur la base de valeurs de correction attribuées à chaque cylindre d'impression et préalablement déterminées, pour un premier et un deuxième cylindre d'impression ; disposer le premier cylindre d'impression (110) à l'extérieur d'une machine à imprimer dans une première position de logement ; fournir une première plaque d'impression ; positionner la première plaque d'impression sur le premier cylindre d'impression (110) dans une première position prédéfinie ; collecter des premières données de position de la première plaque d'impression positionnée sur le premier cylindre d'impression (110) ; disposer le deuxième cylindre d'impression à l'extérieur d'une machine à imprimer en fonction d'une deuxième position de logement ; fournir une deuxième plaque d'impression ; positionner la deuxième plaque d'impression par rapport au deuxième cylindre d'impression dans une deuxième position prédéfinie ; collecter des deuxièmes données de position de la deuxième plaque d'impression positionnée par rapport au deuxième cylindre d'impression ; contrôler les premières et deuxièmes données de position sur la base des première et deuxième positions prédéfinies ; et, le cas échéant, corriger le positionnement de la deuxième plaque d'impression, si le résultat du contrôle est négatif.
EP13731136.1A 2012-08-21 2013-06-24 Procédé et dispositif d'orientation de plaques d'impression sur des cylindres d'impression Withdrawn EP2888109A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012214824.8A DE102012214824A1 (de) 2012-08-21 2012-08-21 Verfahren und Vorrichtung zum Ausrichten von Druckplatten auf Druckzylindern
PCT/EP2013/063139 WO2014029527A1 (fr) 2012-08-21 2013-06-24 Procédé et dispositif d'orientation de plaques d'impression sur des cylindres d'impression

Publications (1)

Publication Number Publication Date
EP2888109A1 true EP2888109A1 (fr) 2015-07-01

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Application Number Title Priority Date Filing Date
EP13731136.1A Withdrawn EP2888109A1 (fr) 2012-08-21 2013-06-24 Procédé et dispositif d'orientation de plaques d'impression sur des cylindres d'impression

Country Status (10)

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US (1) US20150231876A1 (fr)
EP (1) EP2888109A1 (fr)
CN (1) CN104520106B (fr)
AU (1) AU2013304705C1 (fr)
BR (1) BR112015000646A2 (fr)
CA (1) CA2878870A1 (fr)
DE (1) DE102012214824A1 (fr)
MX (1) MX2015001914A (fr)
RU (1) RU2015103141A (fr)
WO (1) WO2014029527A1 (fr)

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Also Published As

Publication number Publication date
BR112015000646A2 (pt) 2017-06-27
RU2015103141A (ru) 2016-10-10
DE102012214824A1 (de) 2014-02-27
WO2014029527A1 (fr) 2014-02-27
US20150231876A1 (en) 2015-08-20
MX2015001914A (es) 2015-06-05
AU2013304705C1 (en) 2018-01-18
CA2878870A1 (fr) 2014-01-27
AU2013304705A1 (en) 2015-04-09
AU2013304705B2 (en) 2017-10-05
CN104520106A (zh) 2015-04-15
CN104520106B (zh) 2017-08-11

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