EP1842666A2 - Procédé et dispositif destinés à l'impression d'objets en forme de plaques - Google Patents

Procédé et dispositif destinés à l'impression d'objets en forme de plaques Download PDF

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Publication number
EP1842666A2
EP1842666A2 EP07003380A EP07003380A EP1842666A2 EP 1842666 A2 EP1842666 A2 EP 1842666A2 EP 07003380 A EP07003380 A EP 07003380A EP 07003380 A EP07003380 A EP 07003380A EP 1842666 A2 EP1842666 A2 EP 1842666A2
Authority
EP
European Patent Office
Prior art keywords
workpiece
printing
thickness
measured
pressure
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
EP07003380A
Other languages
German (de)
English (en)
Other versions
EP1842666A3 (fr
EP1842666B1 (fr
Inventor
Norbert Damm
Sascha Lämmle
Michael Poitinger
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.)
Robert Buerkle GmbH
Original Assignee
Robert Buerkle 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 Robert Buerkle GmbH filed Critical Robert Buerkle GmbH
Publication of EP1842666A2 publication Critical patent/EP1842666A2/fr
Publication of EP1842666A3 publication Critical patent/EP1842666A3/fr
Application granted granted Critical
Publication of EP1842666B1 publication Critical patent/EP1842666B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/24—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on flat surfaces of polyhedral articles
    • B41F17/26—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on flat surfaces of polyhedral articles by rolling contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/24—Cylinder-tripping devices; Cylinder-impression adjustments
    • B41F13/34—Cylinder lifting or adjusting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0072—Devices for measuring the pressure between cylinders or bearer rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44F—SPECIAL DESIGNS OR PICTURES
    • B44F9/00—Designs imitating natural patterns
    • B44F9/02—Designs imitating natural patterns wood grain effects

Definitions

  • the invention relates to a method and an apparatus for printing plate-shaped workpieces according to the preambles of claims 1 and 9. Accordingly, the workpieces are printed in a printing nip, which is formed by two spaced-apart adjustable pressure rollers.
  • the plate-shaped workpieces are transported for this purpose by means of a transport device to the printing nip.
  • the pressure rollers forming the printing nip can be printing cylinders for direct printing, application rollers for indirect printing and impression cylinders.
  • the print image is indispensable for the print image to be positioned on the workpiece within very close tolerances, typically with tolerances of about ⁇ 0.1 mm to ⁇ 0.25 mm. Only in this way is it possible to achieve an optical quality of the printed surface that is comparable to conventional film coating.
  • the printing gap forming pressure rollers are adjustable in their distance from each other to print plate-shaped workpieces of different thickness can. Again, completely different conditions are present, such as the printing of paper sheets and paper webs or films.
  • the mutual adjustment of the pressure rollers is difficult to create in the required parallelism, which ensures the desired accuracy in printing even with large workpieces and correspondingly long pressure rollers.
  • a height restriction of the pressure rollers, ie a non-parallelism in the plane spanned by the pressure roller axes level results in pressure by the flexibility of rolling on the workpiece surface pressure roller over the width not constant remaining effective radius.
  • the parallelism of the pressure rollers must therefore be readjusted by hand.
  • a sheet of paper is introduced into the nip, optionally with a plate therein, and reciprocated in the nip.
  • An experienced printer can then use the hand-held sheet of paper to sense whether or not the nip is parallel across its entire width. This tactile measurement and fine-tuning provides useful results in tenths to hundredths of a millimeter range.
  • the present invention is therefore based on the object to propose a method and an apparatus of the type mentioned, which allow to print plate-shaped workpieces with improved print image tolerances.
  • the invention proposes to measure before the nip, the thickness of each workpiece, optionally - if present - together with the conveyor belt and its tolerant thickness, and the pressure nip forming pressure rollers by means of actuators at their bearings automatically to the measured thickness of the workpiece - if necessary with conveyor - set.
  • the press nip is accordingly adjusted to this wedge shape by interleaving the two pressure rollers relative to one another, ie by obliquely changing the distance between the two pressure rollers, so that the effective radius of the pressure roller exceeds the entire width of the workpiece remains constant and so the desired minimum image tolerance values can be achieved.
  • the basic principle of the present invention is thus provided on both sides, alternately independent motorized pressure gap adjustment as a function of a previously measured in-line workpiece thickness signal.
  • the thickness measurement can take place in the transport direction over the entire workpiece length, so that a thickness profile is measured, by means of which the printing gap can then be adjusted in real time as the workpiece passes.
  • This measure allows regardless of a change in thickness of the workpiece over the width of an adjustment of the pressure nip at changes in thickness of the workpiece over its length.
  • such can also be used to correct the correlation between the thickness measured before the pressure and the adjustment of the pressure gap.
  • the measured difference of the bearing forces can generate a correction element.
  • the conditions in printing presses of the present type are complex, and an adjustment of the printing gap in real time in response to corresponding measured values generates a vibratory system, so that it is advantageous may be to average the bearing forces and their difference in time intervals and then perform a trend correction calculated by a suitable algorithm.
  • a measured bearing force difference then does not directly affect the workpiece just measured, but tends to result in better and better results across several workpieces.
  • the present invention for measuring the workpiece thickness before reaching the nip sensor sensor advantageously also the leading edge of the workpiece can be detected and accelerated or delayed with this information, the workpiece and / or a pressure roller involved in printing to ensure a positionally correct image beginning on the workpiece ,
  • This method is inherently out of the DE 103.33 626 A1 known.
  • the two pressure rollers of the printing nip can be interlocked to a small extent as offset adjustment, so that a transversely directed to the transport direction of the workpiece force acts on this.
  • This may be desirable in order to guide the workpiece reliably along an edge boundary, for example of a side ruler, and thus to ensure a precise pass through all printing gaps of a multicolor printing press in the case of rectangular plates.
  • the present invention thickness measuring device in front of the printing nip can be designed so that above and below the workpiece Distance sensors are arranged and the difference of the thickness of the workpiece is determined.
  • the thickness measuring device may also consist of two imaging sensors which laterally scan the two side edges of the workpiece and accordingly record a profile thereof.
  • the thickness gauge may consist of a measuring calender provided with displacement sensors for determining the thickness of the workpiece.
  • a measuring calender provides the great advantage of a measuring calender to the values measured by it correspond exactly to those values which have to be set at the printing nip, even if the workpiece does not have an exact wedge shape, but a certain waviness, which can only be averaged out by the correction of the printing nip because the pressure rollers are cylindrically shaped.
  • not to be underestimated advantage of a Meßkalander offers the possibility not only displacement sensors, but also to attach force sensors to its bearings in order to carry out the above-described force measurement or force difference measurement before the workpiece reaches the nip. This opens up the possibility of adjusting the pressure gap before the pressure by means of a force difference measurement.
  • the present invention is particularly suitable for multi-color printing, so that preferably a plurality of pressure gaps are arranged in line one behind the other.
  • a very high accuracy results when printing on the different colors, while the workpiece-dependent correction requirement can be carried out by a single thickness measurement before reaching the first printing nip.
  • the force measurement at the bearings of the individual pressure rollers is specific for each pressure nip.
  • FIG. 1 an embodiment of a device according to the invention is shown schematically in plan view. It is a printing machine for a simple direct printing or a first printing station for a multi-color printing machine, the other printing stations are not shown for simplicity.
  • a conveyor belt 1 passes through a pressure nip 2, which is formed by a pressure roller formed as a gravure cylinder 3 and a non-visible in plan view, arranged below the conveyor belt 1 impression cylinder.
  • the gravure cylinder 3 is height adjustable, wherein the two servomotors 4 and 5 can be operated independently.
  • a plate-shaped workpiece 7 is brought in a symbolized by the arrow 8 passage direction to the pressure nip 2, where it is transferred to the conveyor belt 1.
  • a thickness measuring device 9 which is formed here from each of two above and below the workpiece 7 arranged right and left distance sensors 10. Accordingly, the workpiece 7 is measured both on its right and on its left side to detect differences in thickness, for example by a slight wedge shape. If such differences in thickness are present, the left positioning motor 4 and the right positioning motor 5 are correspondingly adjusted differently, so that the gravure cylinder 3 is slightly entangled against the impression cylinder in order to reproduce the wedge shape of the workpiece 7. Accordingly, the effective radius of the gravure cylinder 3 is then constant over the entire width of the workpiece 7 during printing, so that no image distortions occur. A lateral deflection of the workpiece 7 is then not to be feared in the nip 2.
  • the left and right servomotors 4, 5 shown only symbolically in FIG. 1 are also provided with force measuring sensors in order to measure, directly or indirectly, the bearing forces acting on the gravure cylinder during the printing of the workpiece 7.
  • a difference of the left and right bearing forces means that the setting of gravure cylinder 3 and counter-pressure cylinder due to an offset or other effects, the thickness profile of the workpiece 7 does not exactly over the width and therefore undesirably a difference in the effective radius of the engraving cylinder 3 from the left to the right side of the workpiece 7 in spite of the adjusted due to the thickness gauge 9 servo motors 4 and 5 occurs. This can then be used for the tendency correction of the relationship between the values recorded in the thickness measuring device 9 and the adjustment of the servomotors 4 and 5 for the following workpieces 7.
  • FIG. 2 shows a diagram of the forces measured by the two force measuring sensors assigned to the servomotors 4 and 5.
  • the bearing force is recorded on the left and bottom, the bearing force on the right over time, whereby - due to the approximate rectangular shape of the forces occurring - is clearly visible, that in the time applied, a workpiece 7 has been transported through the printing nip 2.
  • the bearing force on the left was significantly higher than the bearing force on the right, which suggests that on average the thickness profile of the workpiece 7 does not harmonize with the setting of the engraving cylinder 3 and the counterpressure roller.
  • the higher left bearing force indicates that there the effective radius of the engraving cylinder 3 is lower than on the right side.
  • the force measuring sensors record the time course of the left and right bearing forces, as well as with the thickness gauge 9, not only the thickness difference of the workpiece 7 between the right and left sides are measured, but also its thickness profile in throughput direction.
  • FIG. 3 and Figure 4 show two different embodiments of a thickness measuring device 9 of the device according to the invention.
  • a total of four distance sensors 10 are provided for thickness measurement, seen above the workpiece in the direction of passage 8 on the left side 10a and on the right side 10b and below the workpiece on the left side 10c and on the right side 10d.
  • the thickness of the workpiece 7 is measured on the right and left.
  • a front edge sensor 11 sets down a signal as soon as the leading edge 7 of the workpiece passes it. With the help of this signal can then - as is well known - the printed image are triggered or optionally the gravure cylinder 3 or arranged between the gravure cylinder and the workpiece 7 blanket cylinder so accelerated or decelerated that the print image start coincides with the front edge of the workpiece 7 and no Edge remains.
  • FIG. 4 Another principle of a thickness measurement is shown in FIG. 4: viewed in the direction of passage 8, laterally next to the workpiece, two CCD cameras 12 are arranged, with a left CCD camera 12a scanning the left side edge of the workpiece 7, while a right CCD camera 12b monitors the right side edge of the workpiece 7. Based on the pixels recorded by the CCD cameras 12 and their gray values, the respective thickness of the workpiece 7 guided past the CCD cameras 12 can be determined.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Printing Methods (AREA)
  • Screen Printers (AREA)
EP07003380A 2006-04-08 2007-02-17 Procédé et dispositif destinés à l'impression d'objets en forme de plaques Active EP1842666B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006016694A DE102006016694B4 (de) 2006-04-08 2006-04-08 Verfahren und Vorrichtung zum Bedrucken von plattenförmigen Werkstücken

Publications (3)

Publication Number Publication Date
EP1842666A2 true EP1842666A2 (fr) 2007-10-10
EP1842666A3 EP1842666A3 (fr) 2011-05-25
EP1842666B1 EP1842666B1 (fr) 2013-03-27

Family

ID=38346153

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07003380A Active EP1842666B1 (fr) 2006-04-08 2007-02-17 Procédé et dispositif destinés à l'impression d'objets en forme de plaques

Country Status (7)

Country Link
US (1) US20080028960A1 (fr)
EP (1) EP1842666B1 (fr)
CN (1) CN101049756A (fr)
BR (1) BRPI0701351A (fr)
DE (1) DE102006016694B4 (fr)
ES (1) ES2433375T3 (fr)
TW (1) TW200744854A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2022568A2 (fr) * 2007-08-07 2009-02-11 GE.MA.TA. S.p.A. Machine pour le vernissage et l'impression à dessin sur plaques rigides et planes
ITMI20091461A1 (it) * 2009-08-11 2011-02-12 Agostino Leveni Sistema di stampa con rullo microinciso riproducente disegni o effetti e che colora utilizzando polveri termoindurenti elettrostatiche o pigmenti colorati poste in sospensione in un veicolo liquido.

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103057262A (zh) * 2011-10-24 2013-04-24 致伸科技股份有限公司 用于印刷装置的印刷控制方法与印刷装置
CN109230732A (zh) * 2018-08-31 2019-01-18 江苏中印印务集团有限公司 印刷纠偏装置
KR102422810B1 (ko) * 2021-11-18 2022-07-19 한국기계연구원 인쇄 장치 및 이의 인쇄 압력 제어 방법
CN114571848A (zh) * 2022-03-16 2022-06-03 张汉民 一种建筑板状建材印花装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR676977A (fr) 1929-06-21 1930-03-01 Masa Gmbh Zur Herstellung Kuns Machine pour l'impression de dessins par transport
DE581049C (de) 1933-07-20 Julius Fischer Maschinenfabrik Maschine zum Bedrucken von Brettern, Platten o. dgl.
WO2003035398A1 (fr) 2001-10-24 2003-05-01 Nebiolo Printech S.P.A. Presse offset

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2727043C3 (de) * 1976-06-16 1980-05-08 Fuji Photo Film Co., Ltd., Ashigara, Kanagawa (Japan) Vorrichtung zum Drucken von Markierungen auf Stahlplatten
FR2519583A1 (fr) * 1982-01-12 1983-07-18 Smh Alcatel Mecanisme d'entrainement et d'impression pour machine a affranchir
DE3429049A1 (de) * 1984-08-07 1986-02-20 Robert Bürkle GmbH & Co, 7290 Freudenstadt Vorrichtung zur beschichtung planer werkstuecke mit fliessfaehigen werkstoffen
DE3801429C2 (de) * 1988-01-20 1998-05-20 Siemens Ag Druckvorrichtung mit verstellbarer Gegendruckrolle
US5118209A (en) * 1990-03-30 1992-06-02 Transtechnology Corporation Print gap optimizer
DE4326794C2 (de) * 1993-08-10 1999-03-11 Kammann Maschf Werner Verfahren und Vorrichtung zum Bedrucken von flachen Einzelobjekten
DE19949951C2 (de) * 1999-10-16 2003-06-18 Ltg Mailaender Gmbh Lackier- oder Druckmaschine und Regelverfahren dafür
JP2002361993A (ja) * 2001-06-07 2002-12-18 Nec Corp 押印装置
CN100341756C (zh) * 2002-08-30 2007-10-10 富士通株式会社 纸张类折角检测方法和纸张类折角检测装置
WO2004086150A1 (fr) * 2003-03-26 2004-10-07 Multi Sign A/S Impression sur du metal par poudrage electrostatique selectif
DE10333626A1 (de) * 2003-07-24 2005-02-17 Robert Bürkle GmbH Vorrichtung zum Bedrucken von flächigen Werkstücken
DE102004011229A1 (de) * 2004-03-04 2005-09-29 Theodor Hymmen Holding Gmbh Verfahren und Vorrichtung zum Bedrucken einer Platte

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE581049C (de) 1933-07-20 Julius Fischer Maschinenfabrik Maschine zum Bedrucken von Brettern, Platten o. dgl.
FR676977A (fr) 1929-06-21 1930-03-01 Masa Gmbh Zur Herstellung Kuns Machine pour l'impression de dessins par transport
WO2003035398A1 (fr) 2001-10-24 2003-05-01 Nebiolo Printech S.P.A. Presse offset

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2022568A2 (fr) * 2007-08-07 2009-02-11 GE.MA.TA. S.p.A. Machine pour le vernissage et l'impression à dessin sur plaques rigides et planes
EP2022568A3 (fr) * 2007-08-07 2010-06-30 GE.MA.TA. S.p.A. Machine pour le vernissage et l'impression à dessin sur plaques rigides et planes
ITMI20091461A1 (it) * 2009-08-11 2011-02-12 Agostino Leveni Sistema di stampa con rullo microinciso riproducente disegni o effetti e che colora utilizzando polveri termoindurenti elettrostatiche o pigmenti colorati poste in sospensione in un veicolo liquido.

Also Published As

Publication number Publication date
CN101049756A (zh) 2007-10-10
EP1842666A3 (fr) 2011-05-25
EP1842666B1 (fr) 2013-03-27
BRPI0701351A (pt) 2007-12-11
TW200744854A (en) 2007-12-16
US20080028960A1 (en) 2008-02-07
ES2433375T3 (es) 2013-12-10
DE102006016694A1 (de) 2007-10-18
DE102006016694B4 (de) 2010-10-07

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