EP2392462A1 - Druckverfahren durch einen Schreibmechanismus mit entweder einem Druckkopf mit mehreren Gruppen von nebeneinander angeordneten Schreibelementen oder einer Vielzahl nebeneinander angeordneter Druckköpfe - Google Patents

Druckverfahren durch einen Schreibmechanismus mit entweder einem Druckkopf mit mehreren Gruppen von nebeneinander angeordneten Schreibelementen oder einer Vielzahl nebeneinander angeordneter Druckköpfe Download PDF

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Publication number
EP2392462A1
EP2392462A1 EP11425150A EP11425150A EP2392462A1 EP 2392462 A1 EP2392462 A1 EP 2392462A1 EP 11425150 A EP11425150 A EP 11425150A EP 11425150 A EP11425150 A EP 11425150A EP 2392462 A1 EP2392462 A1 EP 2392462A1
Authority
EP
European Patent Office
Prior art keywords
writing
print head
laser
diode
distance
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
EP11425150A
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English (en)
French (fr)
Other versions
EP2392462B1 (de
Inventor
Roberto Enea
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.)
Metoda SpA
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Metoda SpA
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Publication date
Application filed by Metoda SpA filed Critical Metoda SpA
Publication of EP2392462A1 publication Critical patent/EP2392462A1/de
Application granted granted Critical
Publication of EP2392462B1 publication Critical patent/EP2392462B1/de
Not-in-force legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/447—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
    • B41J2/45—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using light-emitting diode [LED] or laser arrays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/16—Special spacing mechanisms for circular, spiral, or diagonal-printing apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/54—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements
    • B41J3/543—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements with multiple inkjet print heads

Definitions

  • the present invention relates to a printing method by a writing mechanism having either one print head with multiple arrays of side by side writing elements or a plurality of side by side print heads.
  • CTP Computer to plate
  • CTP Given the current state of laser technology, it is difficult to manufacture individual heads that generate a high number of spots. The reason for this is that, in the case of diode laser heads, inserting a large number of diodes on a single chip significantly increases the likelihood of production waste. In addition, when using the laser heads, probability of failure increases also due to chip overheating. This severely reduces the productivity of CTP.
  • a possible solution to the problem is the use of either multiple print heads operating simultaneously or one print head having multiple arrays of diodes inside it.
  • an object of the present invention is to provide a printing method by a writing mechanism having either one print head with multiple arrays of side by side writing elements or a plurality of side by side print heads, in order to overcome the above mentioned drawbacks, and in particular those of the IBM method.
  • Line clock is defined as a train of pulses generated by a data supply device through the zoom of signals from an angle encoder mounted on a drum.
  • the zoom has to be sufficient to achieve a discretization of 10 ⁇ m of the surface of the same drum when a resolution of 2540 dpi is desired, or a discretization of 5 ⁇ m for a resolution of 5080 dpi, and so on.
  • Helix pitch is intended as the displacement in mm of the laser head on a respective linear guide for each drum rotation of 360°.
  • the helix pitch depends on the number of spots generated by the head in correspondence of each clock line.
  • Spot is defined as the surface of the plate exposed by a single laser beam.
  • each of the n laser diodes produces a spot on the plate.
  • a particular deflection angle of the laser beam corresponds to each exposed spot on a single line
  • pitch has two different meanings depending on the technology it refers to.
  • the deflection technology pitch is the distance between the spot generated by the single laser beam, deflected by a certain angle, and the spot generated by applying the next higher or lower deflection angle. This discretization of the deflection angles is based on the need of having between one spot and another a distance, e.g. of 10 ⁇ m, to obtain an image resolution of 2540 dpi.
  • Relative distance of a diode is defined as the discretized distance between a diode (or any writing element) and the first diode of the laser array, the first diode being the diode which is in the entire one-dimensional array in the extreme opposite with respect to the direction of writing.
  • the present invention provides a printing method by a writing mechanism having either one print head with multiple arrays of side by side writing elements or a plurality of side by side print heads, comprising:
  • the pitch is not homogeneous.
  • the condition above described allows a multi-head printing system to be implemented in a very simple way, i.e. by setting the print heads side by side.
  • the printing method according to the invention has to be able to maintain the distance between the first writing element in each print head and the first writing element of the first print head by observing the feature that the distance between the print heads is equal to the pitch among the writing element inside the print head being multiplied by the number of writing elements plus one. Then, if the distance between the print heads is defined with D , the number of operating writing elements with n , the pitch inside each single print head with p , it is obtained D ⁇ n + 1 ⁇ p .
  • the printing mechanism can advantageously provided with means that allows la D or distance between the print heads to be changed.
  • it is sufficient to identify a number of writing elements that is co-prime with p as provided in the European Patent Application EP 1998544 of the same inventor, i.e. their prime factorisation has no elements in common except the value equal to 1; and then to change the distance between the heads for recovering the system operation, even if, obviously, with less productivity.
  • the printing method according to the present invention permits obstacles meet by Heidelberg to be overcome, as it allows to write by means of one or more heads side by side at a short distance.
  • the distance between the extreme diodes of both heads has to be maintained under an error less than about a quarter of the resolution distance, in order to not influence the writing
  • the distance between the writing elements of a same print heads or the distance between the print heads is of at least a order of magnitude lower, so that the relative error under which it need to stay, is mayor than at least an order of magnitude.
  • the printing mechanism of the method according to the invention operates as if the plurality of its print heads were as a single print head, it generates a productivity increase that is equal to the product of the productivity of a single print head per the number of print heads used independently from the size of the plate, for example, in the CTP technology.
  • Two engraving laser heads 1, 2 are set side by side on a linear track (not shown) to move parallel to the axis x of rotation of a cylindrical drum 3, that is a rotating support member supporting means, e.g. a photosensitive plate, being adapted to receive spots or engraving marks from two laser heads 1, 2.
  • a rotating support member supporting means e.g. a photosensitive plate
  • the laser heads 1, 2 are displaced, for every single rotation of drum 3, by a distance equal to the product of the number of laser diodes in the heads and the writing resolution.
  • the marks or spots are generated by laser diodes 5 column by column, one per each laser diode, which interlace to form the complete image.
  • the task of the multi-head printing mechanism is to take advantage from the interlacing of the columns generated by each writing element or diode, to completely fill a surface without any overlapping or empty columns.
  • the writing elements or laser diodes are such that:
  • the following table shows, for example, the development of writing after eight rotations of the drum.
  • the columns of the image are marked with the index of the laser that writes them, and the not yet written columns are marked with zero, each rotation is marked with a colour, as in Table 0.
  • any multiple writing system i.e. having more than one writing element, system which uses the interlacing of columns generated by each writing element, can completely fill a surface without any overlaps or empty columns, as long as the previous relations (1) and (2) are valid.
  • the element ( r + k i ) n allows all multiples of n to be achieved, and s i for the initial hypothesis allows all values between kn and ( k + 1 ) n to be obtained by virtue of the initial supposition.
  • the columns are separated by a dash in order to simplify reading. Columns are designated with 0 are not written by any laser. Otherwise they are designated by the index of the laser covering that column. A simulator returns a mistake in case of overlap. In this case any overlap is not been detected.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printers Characterized By Their Purpose (AREA)
EP20110425150 2010-06-05 2011-06-06 Druckverfahren durch einen Schreibmechanismus mit entweder einem Druckkopf mit mehreren Gruppen von nebeneinander angeordneten Schreibelementen oder einer Vielzahl nebeneinander angeordneter Druckköpfe Not-in-force EP2392462B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITRM2010A000306A IT1400421B1 (it) 2010-06-05 2010-06-05 Meccanismo di scrittura a più teste per stampante

Publications (2)

Publication Number Publication Date
EP2392462A1 true EP2392462A1 (de) 2011-12-07
EP2392462B1 EP2392462B1 (de) 2013-08-21

Family

ID=43447132

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20110425150 Not-in-force EP2392462B1 (de) 2010-06-05 2011-06-06 Druckverfahren durch einen Schreibmechanismus mit entweder einem Druckkopf mit mehreren Gruppen von nebeneinander angeordneten Schreibelementen oder einer Vielzahl nebeneinander angeordneter Druckköpfe

Country Status (2)

Country Link
EP (1) EP2392462B1 (de)
IT (1) IT1400421B1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069486A (en) 1976-06-28 1978-01-17 International Business Machines Corporation Single array ink jet printer
US4131898A (en) * 1977-09-15 1978-12-26 The Mead Corporation Interlacing recorder
JPS5822176A (ja) * 1981-08-03 1983-02-09 Hitachi Ltd プリンタ装置
US4401991A (en) 1981-10-08 1983-08-30 International Business Machines Corporation Variable resolution, single array, interlace ink jet printer
US20040252181A1 (en) * 2003-06-16 2004-12-16 Heidelberger Druckmaschinen Ag Imaging device for a printing form and method for arranging optical components in the imaging device
US20060187296A1 (en) * 2005-02-24 2006-08-24 Heidelberger Druckmaschinen Ag Method of producing a printing form
EP1998544A1 (de) 2007-06-01 2008-12-03 Andromeda S.r.l. Belichtungskopf mit hochzeiligen Laserstrahlen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2945838B2 (ja) * 1994-09-08 1999-09-06 松下電送システム株式会社 画像記録装置
DE10031915A1 (de) * 2000-06-30 2002-01-10 Heidelberger Druckmasch Ag Kompakte Mehrstrahllaserlichtquelle und Interleafrasterscanlinien-Verfahren zur Belichtung von Druckplatten

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069486A (en) 1976-06-28 1978-01-17 International Business Machines Corporation Single array ink jet printer
US4131898A (en) * 1977-09-15 1978-12-26 The Mead Corporation Interlacing recorder
JPS5822176A (ja) * 1981-08-03 1983-02-09 Hitachi Ltd プリンタ装置
US4401991A (en) 1981-10-08 1983-08-30 International Business Machines Corporation Variable resolution, single array, interlace ink jet printer
US20040252181A1 (en) * 2003-06-16 2004-12-16 Heidelberger Druckmaschinen Ag Imaging device for a printing form and method for arranging optical components in the imaging device
US20060187296A1 (en) * 2005-02-24 2006-08-24 Heidelberger Druckmaschinen Ag Method of producing a printing form
EP1998544A1 (de) 2007-06-01 2008-12-03 Andromeda S.r.l. Belichtungskopf mit hochzeiligen Laserstrahlen

Also Published As

Publication number Publication date
EP2392462B1 (de) 2013-08-21
ITRM20100306A1 (it) 2011-12-06
IT1400421B1 (it) 2013-05-31

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