EP1333986A1 - Druckvorrichtungen mit einer mehrzahl von druckköpfen - Google Patents
Druckvorrichtungen mit einer mehrzahl von druckköpfenInfo
- Publication number
- EP1333986A1 EP1333986A1 EP01996462A EP01996462A EP1333986A1 EP 1333986 A1 EP1333986 A1 EP 1333986A1 EP 01996462 A EP01996462 A EP 01996462A EP 01996462 A EP01996462 A EP 01996462A EP 1333986 A1 EP1333986 A1 EP 1333986A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printing
- printhead
- printing device
- print heads
- printheads
- 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- Withdrawn
Links
- 238000007639 printing Methods 0.000 title claims abstract description 220
- 239000000463 material Substances 0.000 claims abstract description 32
- 239000011248 coating agent Substances 0.000 claims abstract description 12
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 239000005871 repellent Substances 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 230000001154 acute effect Effects 0.000 claims description 5
- 238000007645 offset printing Methods 0.000 claims description 5
- 238000010304 firing Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 238000007641 inkjet printing Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
- B41C1/1066—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by spraying with powders, by using a nozzle, e.g. an ink jet system, by fusing a previously coated powder, e.g. with a laser
-
- 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
- B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
- B41J2/505—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements
- B41J2/515—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements line printer type
Definitions
- the invention relates to printing devices with a plurality of printing heads according to the preamble of claims 1 or 2.
- the printing device is provided with a multiplicity of printheads, each having a printing area, the extent of which in the printing direction defines a line height and the extent of which transversely to the printing direction defines a column width, the printheads being arranged in a plurality of mutually spaced parallel rows and the printheads of different rows being transverse to the printing direction are offset.
- printing direction means the direction of the movement of the printing material to be printed relative to the printing heads. If printing plates mounted on rotating printing plate cylinders are provided as printing material, the printing direction is perpendicular to the axis of rotation of the printing plate cylinder and tangential to the lateral surface.
- Such printing devices are used, for example, to image offset printing plates.
- a coating agent or, conversely, a solvent for dissolving a coating on the printing plate can be sprayed onto the plurality of printing heads.
- the print heads are sufficiently tight to align with each other with an accuracy of a few ⁇ m.
- the possible density of the printheads being packed together is limited because they abut. In this respect, it would be desirable to use as few print heads as possible.
- conventional printheads do not have surfaces on which they can be aligned using stops. In order to position such printheads at a desired point, the position of the print image has to be compared with the target position and the printheads have to be moved accordingly.
- US 57 19 602 A shows an ink jet print head with a large number of nozzle groups. These groups of nozzles are staggered.
- DE 37 30 844 A1 discloses a matrix ink printer in which a plurality of print heads, each having a plurality of nozzle openings, are arranged offset from one another. The nozzle openings cover each other based on the material to be printed.
- GB 23 49 607 A shows a printing device with a plurality of printing heads which are arranged offset to one another. These print heads are arranged inclined in the radial direction with respect to a printing cylinder.
- the US 48 64 328 shows an ink jet print head with several rows of nozzles that are inclined to the printing direction.
- the invention has for its object to provide printing devices with a plurality of print heads.
- the pitch of the print heads in each row of print heads corresponds to the column width times the number of rows and the distance between the rows corresponds to the row height times the number of rows increased by one.
- the column jumps in a print head row correspond to the number of print head rows, while the line jumps between adjacent printhead rows are one more than the number of printhead rows of the printing device.
- the printheads are arranged exactly in such a way that there are no gaps and no overlaps between the printheads where no or double printing would take place. This enables a high resolution to be achieved with a compact design of the printing device.
- Print heads from different rows are advantageously arranged in a common plane.
- one print head from each row can lie in a common plane with a respective print head from every other row. This considerably simplifies the assembly of the individual printheads.
- these can be attached to a flat print head holder.
- the printheads can be easily aligned relative to one another.
- the individual print heads are arranged at an angle to the printing direction in order to achieve a higher resolution.
- Each print head has a longitudinal direction, which is determined by its print area or by the line along which the nozzle openings are arranged.
- the print heads are arranged at an angle to the printing direction in such a way that the longitudinal direction mentioned extends at an acute angle to the printing direction.
- the angle can be adapted to the circumstances, in particular to the design of the print heads. According to one embodiment of the invention, the angle can be between 20 ° and 45 °, in particular approximately 30 °.
- the print heads from different rows are inclined by the same angle.
- they can be arranged such that printheads from different rows lie in a common plane with their longitudinal directions.
- the common plane is inclined to the printing direction by the angle by which the print heads are also inclined to the printing direction.
- Further advantages of the printing devices are, in particular, that instead of moving the print head biaxially in order to adjust the print image sprayed onto the print material by the print head, the alignment of the print head or its print image is simpler by combining a mechanical alignment in one axis and one Time control of the shot of the printhead can be achieved.
- the printhead is thus moved transversely to the printing direction to align the printhead, while the timing of the printhead is changed to align the printhead in the printing direction.
- printing direction means the direction of movement of the printed material to be printed relative to the print heads. If printing plates mounted on rotating printing plate cylinders are provided as printing material, the printing direction is perpendicular to the axis of rotation of the printing plate cylinder.
- the timing of the shot is expediently changed as a function of the printing speed, ie the running speed of the printed material. If the timing of the print head is delayed, the print material continues to pass under the print head and vice versa, so that the print image is adjusted in the printing direction.
- a plurality of printheads of a multi-head printer can be aligned with one another, with at least one of the printheads being displaced transversely to the printing direction for aligning the printheads and / or at least one of the printheads being controlled to align the printheads in the printing direction.
- the shift and a change in the time of the shot can be carried out individually for each printhead or, if appropriate, also for groups of the printheads together.
- the print heads are advantageously moved uniaxially. They are only moved in order to achieve an orientation of the printed image transversely to the printing direction. This considerably simplifies the adjustment. In the case of a shift in only one direction, it need not be taken into account that the printed image could also be shifted in the other axis. The latter is through the Time control of the shooting time adjusted.
- all of the printheads that are moved are in the same direction, i.e. H. along parallel axes. This simplifies the alignment of the print heads relative to each other.
- the print heads can be moved across the print direction. As a result, the alignment transverse to the printing direction is decoupled from the alignment in the printing direction, which simplifies the alignment process as a whole.
- the print heads can each be pushed along an axis which encloses an acute angle to the printing direction.
- a resulting offset of the print heads in the printing direction can be compensated for by a corresponding change in the moment of firing of the respective print head.
- inclined printheads i. H. in the case of printheads which have been positioned at an angle to the printing direction with their print nozzle row in order to allow a closer arrangement of the printheads
- the displacement of the printheads parallel to the inclined position i. H. parallel to the longitudinal direction of the print heads defined by the row of printing nozzles.
- printheads are arranged in several rows, printheads in different rows can be attached to a common inclined printhead holder with such an inclined position. A shift can take place in the longitudinal direction of the holder connecting the printheads.
- an adaptation of the printing screen spacing in the printing direction to the printing nozzle spacing transversely to the printing direction can be accomplished by timing the individual nozzle sections as a function of the printing speed.
- the alignment can advantageously be carried out using a printhead positioning device for the alignment of the print head only transversely to the print direction and a timing device for controlling the timing of the print head for its alignment in the print direction.
- the positioning device is preferably designed as a uniaxial displacement device with which the printhead can be displaced along an axis.
- the displacement axis of the positioning device can be arranged transversely to the printing direction.
- the printhead positioning device has an axis of displacement which includes an acute angle to the printing direction.
- the time control device is designed in such a way that the resulting offset of the print head in the printing direction is compensated for by a change in the point in time at which the print head shoots the individual drops.
- the device has a plurality of print head positioning devices for aligning a plurality of print heads relative to one another.
- the print heads can preferably be set independently of one another.
- the control device can be designed in such a way that the time at which the print heads are fired can be set individually and / or in groups.
- the advantages of the large number of nozzle openings are, in particular, that the entire width of the material, in particular a printing plate, can be printed without the printheads having to be moved during the printing process.
- the print resolution is set by varying the angle of the row of nozzles for moving the material to be printed.
- a compact design of this printing device is through the use of print heads without their own ink tank or through the special arrangement of the print heads possible. This arrangement of the print heads means that the consumption of the circumferential angle around a cylinder is very low.
- Fig. 1 is a schematic representation of the arrangement of the print heads
- Fig. 2 is a schematic representation of the arrangement of the print heads
- Fig. 3 is a schematic representation of a multi-head inkjet printing system with a device for aligning the print heads of the printing system.
- All print heads 1 to 18 are each at an inclination angle 20 to the printing direction 19 slanted to achieve a higher resolution. Due to the inclined position of the printheads 1 to 18, the printheads 1 to 18 can be arranged closer to one another in the direction of the printhead rows and the distance between the nozzle openings of the individual printheads 1 to 18 from one another transversely to the printing direction 19 can be reduced. As shown in FIG. 1, the angle of inclination 20 is defined on the one hand by the printing direction 19 and on the other hand by the longitudinal direction of each print head 1 to 18. The longitudinal direction of the print heads 1 to 18 is determined by the line along which the nozzle openings of a print head 1 to 18 are arranged.
- the row of nozzles of each printhead 1 to 18 has an extension in the printing direction 19 and an extension transverse to the printing direction 19.
- the extension transverse to the printing direction 19 determines the column width of a printing head 1 to 18, while the extension of the nozzle row in the printing direction 19 determines the line height of the corresponding print head 1 to 18.
- the printheads 1 to 18 in each printhead row are spaced apart from one another transversely to the printing direction 19.
- the pitch 21 of the print heads 1 to 18 of a print head row corresponds to the column width times the number of print head rows, in the embodiment shown in FIG. 1, the width of two columns:
- Pitch 21 column width x number of print head rows
- the rows of print heads are also spaced apart from one another in the printing direction 19.
- the row spacing 22 satisfies the following condition:
- Row spacing 22 row height x (number of print head rows + 1)
- the row spacing 22 corresponds to three times the row height, which, as mentioned, is defined by the extension of the row of nozzles of a print head 1 to 18 in the printing direction 19.
- the next print head 1 lies transversely to the print direction 19; 2; 3; 4; 5; 6; 7; 8th; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18 always in the next row and is not in the same row of print heads.
- the numbering of printheads 1 through 18 is a first printhead
- a plurality of printheads 1 to 18 are arranged in a common plane, so that they can be mounted on a planar holder.
- the print heads 1 and 4 are in a common plane and are each mounted on a common print head holder 23 and 24, respectively.
- This common plane of the nozzle openings of the printheads 1 and 4, 3 and 6 etc. is inclined to the printing direction 19 at the angle of inclination 20 and is perpendicular to the printing plane, i. H. to the substrate.
- the plane is inclined to the axis of rotation of the cylinder and lies in the radial direction of the cylinder.
- printhead holder 23 It is fundamentally possible to use the printhead holder 23; 24 mounted printheads 1 to 18 on different sides of the same to fix or arrange. A simpler and in this respect preferred arrangement is given in that the printheads 1 and 4 mounted on a printhead holder 23 are arranged on the same side of the printhead holder 23, as shown in FIG. 1.
- the print head holder 23; 24 can be mounted on a common carrier 25 (FIG. 1).
- the number of print head rows is preferably selected depending on the space requirement. 2, the print heads 1 to 18 can be arranged in three rows of print heads. Otherwise, the arrangement of the print heads 1 to 18 according to FIG. 2 corresponds to the arrangement according to FIG. 1.
- the column jumps between the print heads 1 to 18 correspond to a row of print heads and the line jumps, ie the row spacing in the printing direction 19 of the above-mentioned relationship.
- the inclination of the individual print heads 1 to 18 corresponds to the relationship described above. A further explanation of the embodiment according to FIG. 2 can therefore be dispensed with.
- a multi-head inkjet printing system 29 is provided to illustrate the printing plate 26. This has a pressure bar 30 which extends parallel to the longitudinal axis 28 of the pressure plate cylinder 26 opposite its circumferential side.
- the print heads 31 are arranged in two rows, the print heads 31 being arranged offset in the different rows transversely to the printing direction 32.
- the printing direction 32 is determined by the rotational movement of the printing plate cylinder 26, it extends perpendicular to the longitudinal axis 28.
- the print heads 31 are slidably mounted on the print bar 30.
- a print head positioning device 33 the print heads 31 can be individually displaced relative to the print bar 30 along an axis, so that the position of the respective print head 31 changes transversely to the print direction 32, that is to say parallel to the longitudinal axis 28.
- the print image can be set transversely to the printing direction 32.
- a time control device 34 which controls the timing of the shot of the individual print heads 31 or the individual print nozzles.
- the problem of positioning or aligning the plurality of print heads 31 relative to one another in the plane is thus simplified by the separation of the two axes to be positioned.
- One axis is defined by the direction in which the print material is moving. Accordingly, this axis can be aligned by skilful timing of the shooting time of the individual pressure nozzles.
- the other axis is accordingly transverse to the printing direction 32, that is, parallel to the longitudinal axis 28 in the example shown. This axis 28 alone can accordingly be mechanically aligned more easily.
- the alignment described can also be used in other printhead printing systems for other printing applications in which the position of the printheads 33 is to be aligned.
- Printheads 1-18 d. H. whose nozzle openings extend over the entire width b26 of a material to be printed 26.
- the print heads 1-18 are stationary during the printing. They can only be moved to align the printheads 1-18 with each other or to increase the resolution.
- a variation of the print resolution is possible by multiple images.
- the adjustment transverse to the printing direction takes place by shifting the printing unit between the printing processes by an integral fraction of a pixel spacing of the basic resolution, which is approximately 5 ⁇ m and 50 ⁇ m, so that the image grids are offset from one another.
- the print resolution is adjusted in the direction of the movement of the printed material by correspondingly adjusting the timing of the shooting time.
- the print heads are displaced in the axial direction of the cylinder, preferably the entire one Pressure bar 30 laterally offset.
- the designated printing device preferably prints on a material 26 arranged curved on a cylinder.
- the printing device applies a means for changing the coating or a coating of a printing form 26, the printing form 26 being designed as a planographic printing plate 26.
- the printing plate 26 has an ink-absorbing layer and an ink-repellent layer lying thereon.
- the printing device applies a developing liquid to the ink-repellent layer, with which the ink-repellent layer is changed in the areas affected.
- the printing plate 26 is formed with an ink-repellent layer made of silicone.
- Each printhead preferably has 64 to 256 nozzle openings, the nozzle openings of a printhead being arranged on a straight line.
- Printing plate 25 carriers Printing plate, material, printing material, planographic printing plate, printing form Width of the material Printing plate cylinder Longitudinal axis Multi-head inkjet printing system Print bar Print head (1-18) Print direction Print head positioning device Time control device
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Ink Jet (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10057061 | 2000-11-17 | ||
| DE10057062 | 2000-11-17 | ||
| DE10057062A DE10057062C1 (de) | 2000-11-17 | 2000-11-17 | Verfahren und Vorrichtung zum Ausrichten von Druckköpfen |
| DE10057061A DE10057061C1 (de) | 2000-11-17 | 2000-11-17 | Druckvorrichtung |
| PCT/DE2001/003943 WO2002040278A1 (de) | 2000-11-17 | 2001-10-15 | Druckvorrichtungen mit einer mehrzahl von druckköpfen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1333986A1 true EP1333986A1 (de) | 2003-08-13 |
Family
ID=26007694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01996462A Withdrawn EP1333986A1 (de) | 2000-11-17 | 2001-10-15 | Druckvorrichtungen mit einer mehrzahl von druckköpfen |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6955415B2 (de) |
| EP (1) | EP1333986A1 (de) |
| AU (1) | AU2002223484A1 (de) |
| WO (1) | WO2002040278A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6736484B2 (en) | 2001-12-14 | 2004-05-18 | Seiko Epson Corporation | Liquid drop discharge method and discharge device; electro optical device, method of manufacture thereof, and device for manufacture thereof; color filter method of manufacture thereof, and device for manufacturing thereof; and device incorporating backing, method of manufacturing thereof, and device for manufacture thereof |
| AU2003900180A0 (en) * | 2003-01-16 | 2003-01-30 | Silverbrook Research Pty Ltd | Method and apparatus (dam001) |
| US7316468B2 (en) * | 2004-05-19 | 2008-01-08 | Fujifilm Corporation | Liquid droplet ejection head, liquid droplet ejection device and image forming apparatus |
| US7645020B2 (en) | 2004-07-27 | 2010-01-12 | Neopost Technologies | High speed serial printing using printheads |
| US9248645B1 (en) | 2015-02-06 | 2016-02-02 | Xerox Corporation | Control method to reduce printhead damage and contamination |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3730844A1 (de) * | 1987-09-14 | 1989-03-23 | Siemens Ag | Matrix-schreibeinrichtung |
| DE3812462A1 (de) * | 1988-04-12 | 1989-10-26 | Siemens Ag | Druckvorrichtung |
| US4864328A (en) * | 1988-09-06 | 1989-09-05 | Spectra, Inc. | Dual mode ink jet printer |
| DE4020129A1 (de) * | 1990-06-25 | 1992-01-02 | Standard Elektrik Lorenz Ag | Druckvorrichtung |
| WO1994011191A1 (en) * | 1992-11-17 | 1994-05-26 | Sun Chemical Corporation | Apparatus for fabrication of printing plates |
| US5719602A (en) | 1995-01-20 | 1998-02-17 | Hewlett-Packard Company | Controlling PWA inkjet nozzle timing as a function of media speed |
| IL117278A (en) * | 1996-02-27 | 2000-02-17 | Idanit Tech Ltd | Method for operating an ink jet printer |
| FR2758762B1 (fr) * | 1997-01-24 | 1999-04-16 | Neopost Ind | Tete d'impression postale munie d'un dispositif de reglage d'alignement |
| JP2000158624A (ja) * | 1998-09-25 | 2000-06-13 | Fuji Photo Film Co Ltd | 平版印刷方法 |
| US6154232A (en) | 1999-01-19 | 2000-11-28 | Hewlett-Packard Company | Drum-based printers using multiple pens per color |
| US6183063B1 (en) * | 1999-03-04 | 2001-02-06 | Lexmark International, Inc. | Angled printer cartridge |
| AUPP993399A0 (en) * | 1999-04-22 | 1999-05-20 | Silverbrook Research Pty Ltd | Micro-mechanical system fabrication method(mems16) |
-
2001
- 2001-10-15 US US10/415,654 patent/US6955415B2/en not_active Expired - Fee Related
- 2001-10-15 WO PCT/DE2001/003943 patent/WO2002040278A1/de not_active Ceased
- 2001-10-15 EP EP01996462A patent/EP1333986A1/de not_active Withdrawn
- 2001-10-15 AU AU2002223484A patent/AU2002223484A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0240278A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2002223484A1 (en) | 2002-05-27 |
| US20040032453A1 (en) | 2004-02-19 |
| US6955415B2 (en) | 2005-10-18 |
| WO2002040278A1 (de) | 2002-05-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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| 17P | Request for examination filed |
Effective date: 20030317 |
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| AK | Designated contracting states |
Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SCHNEIDER, GEORG Inventor name: SCHASCHEK, KARL, ERICH, ALBERT Inventor name: KOBLINGER, MICHAEL |
|
| 17Q | First examination report despatched |
Effective date: 20061222 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
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| 18W | Application withdrawn |
Effective date: 20100311 |