WO2002047911A2 - Imprimante a jet d'encre permettant notamment de marquer des produits d'expedition - Google Patents

Imprimante a jet d'encre permettant notamment de marquer des produits d'expedition Download PDF

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Publication number
WO2002047911A2
WO2002047911A2 PCT/DE2001/004686 DE0104686W WO0247911A2 WO 2002047911 A2 WO2002047911 A2 WO 2002047911A2 DE 0104686 W DE0104686 W DE 0104686W WO 0247911 A2 WO0247911 A2 WO 0247911A2
Authority
WO
WIPO (PCT)
Prior art keywords
service
print head
printing
wiping
inkjet printer
Prior art date
Application number
PCT/DE2001/004686
Other languages
German (de)
English (en)
Other versions
WO2002047911A3 (fr
Inventor
Werner Brunnhuber
Rudolf Jauk
Martin Lasinger
Original Assignee
Rena Informationstechnik Gmbh & Co. Kg
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
Priority claimed from DE10062012A external-priority patent/DE10062012A1/de
Application filed by Rena Informationstechnik Gmbh & Co. Kg filed Critical Rena Informationstechnik Gmbh & Co. Kg
Publication of WO2002047911A2 publication Critical patent/WO2002047911A2/fr
Publication of WO2002047911A3 publication Critical patent/WO2002047911A3/fr

Links

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
    • B41J2/005—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
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16585—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles for paper-width or non-reciprocating print heads

Definitions

  • the invention relates to an inkjet printer, in particular for labeling packages, with the features of the preamble of the claim
  • Printers that are used to label packages are usually exposed to a harsh environment.
  • dust, dirt, abrasion in the form of paper particles and the like can cause pressure in its
  • printers use a special service function to be selected by the operator (program selection by the operator), which is usually displaceable in the horizontal direction Printhead moved from the print position or print area to a service position.
  • a service facility In this service position, a service facility is provided that can perform one or more service functions.
  • service functions can be the free spraying of the print head nozzles, a wiping or scraping off the surface of the metal foil in which the print nozzles are formed, or also a complete closing of the nozzles of the print head.
  • Such a printer with a transversely moved print head during a printing process is known for example from EP-B-0 704 307.
  • a revolver-like service device is provided, various service units being arranged on the circumference of the “revolver”. For example, a closure unit for the nozzles and a wiping unit are provided.
  • the pieces to be labeled are moved past a printhead which is stationary during a printing process (so-called printing with a stationary printhead), the printhead being designed such that in one printing process the entire information (in its width) can be printed.
  • the nozzles are provided in a corresponding number over the entire required amount of pressure (ie in the direction perpendicular to the movement of the mail items). Since this type of printer is often integrated into an overall system with other facilities, such as folding and Sorting devices are integrated, there is also a demand for the smallest possible sizes.
  • the invention is based on the object of creating an inkjet printer, in particular for labeling packages, with a stationary print head and a printing method therefor, which, in order to ensure a permanently high-quality print result, the rapid implementation of service functions including Allow setting of a print position.
  • the print head can be moved during a printing process, it is advantageously possible to perform at least one of the service functions, such as rinsing, doctoring, wiping, closing and the like. run the nozzles during short printing pauses (without ejecting the ink).
  • the print head is pivotable.
  • the one or more service units of a service facility can be stationary along the Arranged swivel circle that describe the nozzles of the printhead. This results in a simple structure of the service facility. An exchange of wear parts of individual service units is possible without any problems.
  • such an inkjet printer nevertheless has a simple and space-saving design.
  • the pivot axis of the print head runs parallel to the printing plane in which the nozzles are arranged or parallel to the printing direction. If necessary, the printhead can of course also be designed to be displaceable in addition to its pivotability. This
  • the arrangement of the swivel axis enables the service units to be easily arranged along the swivel circle, since the nozzles are moved out of the pressure plane.
  • the mail pieces can, if possible (for example in the case of thin letters), be guided on a curved path and thereby bent. In this way, there is more space above and below the print position for arranging service units.
  • the print head can be moved sideways, for example along a guide, which can be straight.
  • the sideways movement enables different printing positions to be taken even during a printing process. In this way, for example, different lateral printing positions within a print good and / or when changing between printed goods can be taken without having to interrupt a printing process to manually adjust the new position of the print head.
  • the service facility of all embodiments can comprise a closure device and / or a stripping device and / or a wiping device and / or an ink collecting device as service units.
  • the scraper primarily serves to scrape or scrape off dirt or dried ink residues that are on the
  • the wiper device serves to suck up a small amount of ink up to or onto the surface of the element in which the nozzles are formed, and to subsequently wipe off any excess amount of ink that may be present.
  • the collecting device can be designed, for example, as an ink-absorbing cushion or an ink-absorbing sponge. Appropriate control in the pivotal position in question causes the print head to dispense a certain number of ink droplets from each nozzle (or only from certain nozzles). Dried or undesirably highly viscous ink can be removed from the nozzles.
  • the print head is from a first angular position in which the
  • Closure device is arranged over a second angular position in which the stripping device is arranged, over a third angular position in which the wiping device is arranged, and over a fourth angular position in which the collecting device is arranged into which the Printing position corresponding angular position movable and vice versa.
  • these positions can also be achieved using different lateral positions.
  • the printer preferably has a control unit which controls the swiveling or sideways movements of the print head, wherein in the case of several service units the print head can preferably be moved into the angular position or lateral position of an individual or one after the other into the angular positions or lateral positions of several service units.
  • the print head of a printer according to the invention can be moved into a service position during so-called print breaks, i.e. short breaks in which no ink is ejected, and thus perform at least one service function in order to increase the print quality.
  • the short breaks are in the second range, preferably longer than 0.5 or 1 s and shorter than 2 s or up to 3 s.
  • Such pauses in the labeling of packages usually occur between two printed items and / or when multiple items are labeled, that is, between two printed samples as a time interval depending on the distance between the printed samples (in the printing direction) and the speed of movement
  • Figure 1 is a partially schematic side view of an opened printing unit of a printer of a first embodiment from the prior art.
  • FIG. 2 shows a schematic illustration of the pivoting movement of the print head of a printer according to FIG. 1;
  • FIG. 3 shows a perspective illustration of an integrated stripping and wiping device of the printing unit in FIG. 1;
  • FIG. 4 shows a schematic perspective illustration of a second embodiment of the invention
  • Fig. 5 is a perspective view of a printing unit in Fig. 4;
  • Fig. 6 is a plan view of a printing unit according to Fig. 5 and
  • FIG. 7 is a bottom view of a printing unit according to FIGS. 5 and 6.
  • the first exemplary embodiment of a printing unit of a printer 1 shown in FIG. 1 has a printhead 5 pivotably mounted in a housing 3.
  • the pivotable mounting of the printhead 5 takes place by means of a pivotably mounted receiving part 7, in which the printhead is used and held interchangeably.
  • the printhead 5 is designed in the usual way as an integrated unit, in which a cartridge housing 9 receiving the ink is integrally formed or connected to an element 11 in which the actual nozzles for dispensing the ink droplets are formed.
  • This element usually includes one
  • Metal foil with the nozzle openings and a controllable device for ejecting the ink droplets.
  • the printhead 5 shown in FIG. 1 has not been moved. This printer is therefore intended for applications in which the material to be printed is moved past the print head.
  • the receiving part 7 is mounted with bearing pins 13 in the housing 3, the pivot axis A running parallel to the pressure plane E, which is formed by the surface of the element 11, in which the discharge openings of the nozzles are formed.
  • the receiving part has two parallel side walls between which the print head 5 is inserted. The exact lateral positioning of the printhead takes place by means of resilient elements which act on the printhead on one side and press against the inside of the opposite side wall. By means of a pivotable holding flap 15, the print head is pressed against a rear stop in the direction perpendicular thereto and is thus positioned in this direction and at the same time fixed in the correct position.
  • a drive which can comprise a stepper motor, for example.
  • the drive can be controlled by a control unit, not shown in detail, that the receiving part 7 and thus the print head 5 can be moved into predetermined angular positions.
  • swivel circle K which the surface of the element 11 describes with the pressure nozzles
  • several service units of a service facility are provided at different angular positions. These are a closure device 17, a stripping device 19, a wiping device 21 and an ink collecting device 23.
  • the closure device 17 is designed to be pivotable about an axis B and has a driver stop 25.
  • a seal arranged on the side of the closure device 17 facing the element 11 of the print head 5 is pressed against the surface of the element 11 and thus closes the nozzles.
  • the closed position is defined by a stop 27.
  • the driver stop 25 is pressed against this in the closed position as a result of the action on the relevant side wall of the element 11 of the print head 5.
  • the receiving part 7 is fixed in the closed position by means of a latching element 29 which has a latching recess 29a.
  • a complementary latching element engages in the latching recess 29, which latching element can be designed so that it can be actuated in order to release the pivoting movement of the receiving part 7.
  • the closure device 17 is preferably acted upon by a resilient element in such a way that it assumes the position shown in FIG. 1 until it pivots when the print head 5 is pivoted into the closed position as a result of the element 11 of the print head 5 resting on the driver stop 25 in the position shown in FIG Stop 27 defined end position is moved.
  • the stripping device 19 comprises a stripping lip 31, which is designed to be flexible and yet sufficiently rigid to ensure that deposits in the form of dirt or ink are stripped or scraped off the surface of the element 11.
  • the relevant edges on the upper end face of the wiping lip are sharply designed for this purpose, ie they have a very small one
  • the wiping device 21 has the function of first sucking a small amount of ink out of the nozzles up to or onto the surface of the element 11 and then wiping it when the element 11 is moved past. This removes undesirably high viscosity ink from the nozzles and the nozzles are cleaned of dirt particles.
  • the wiper device 21 comprises a wiper element 33 with two wiper lips 35. The two edges on the upper end face of each wiper lip 35 are designed differently: the inner edges facing each other are sharp-edged and serve to scrape off unnecessary ink on the surface of the element 11. The outer Edges of the wiper lips 35 facing away from one another, however, have a relatively large radius. As a result, when the element 11 of the print head 5 moves past, a negative pressure is generated, through which ink is sucked up to or onto the surface of the element 11.
  • the wiping edge of the one wiping lip with a large radius is initially effective, i.e. ink is sucked in and then the sharp wiping edge of the other wiping lip, i.e. ink is scraped off.
  • the nozzles are located opposite a collecting device 23, which can be designed, for example, as a sponge or the like.
  • the control unit controls the print head 5 in such a way that a predetermined one is obtained from each or from certain nozzles Number of ink droplets are dispensed to ensure that immediately after moving the print head to the print position, printing can begin with the required high quality and sufficient amount of ink.
  • the stripping device 19 As shown in Fig. 3, the stripping device 19, the
  • Wiping device 21 and the collecting device 23 can be integrated in a common holding device 37.
  • the holding device can, as a replacement part, enable simple, simultaneous replacement of the devices in question.
  • For fixation in the housing 3 of the printer 1 are in a side wall and an end wall of the holding device
  • the print head 5 is first moved out of the closed position I (in the following always means an angular position) by a counterclockwise pivoting movement. The nozzles are then released.
  • a stripping process is then carried out by means of the stripping lip 31 of the stripping device.
  • a wiping process consisting of a suction and a doctoring process is then carried out by means of the two wiping lips 35 of the wiping element 33 of the wiping device 21.
  • free spraying position IV free spraying of the
  • the print head 5 is moved to the printing position V and printing can begin.
  • the control unit of the printer can move the print head into one or more of the positions II to IV after a certain number of printing operations in order to carry out the relevant service function.
  • the print head is preferably first moved at least to position III in order to carry out a wiping process
  • Free spray position IV carried out a free spraying process.
  • the closure device 17 can be designed such that a flushing function can also be carried out.
  • a suction device integrated in the closure device draws a larger amount of ink from the print head, in order in this way to clean possibly clogged or contaminated nozzles.
  • FIG. 4 shows a schematic representation of a second embodiment of a printer according to the invention with a printing unit 50, which can be displaced (along an elongated, straight guide 54, for example)
  • Displacement A has print head 52.
  • the printhead 52 is displaced here via a belt drive 56, which is driven, for example, by a stepper motor controlled by a control unit. As shown in FIG. 4, the print head 52 can be displaced in the direction A along the guide 54 via the drive 56 along the guide 54 from the stationary printing position shown in the drawing.
  • a service device designed as a closure device 60 and a stripping device 58 is located laterally outside of the printed material 62 and is functional and
  • Training may correspond to the first embodiment described above.
  • the service device with a stripping device 58 and a closure device 60 in any combination of these devices, possibly with an additional, separate or integrated wiper device and / or additional, separate or integrated collecting device.
  • the second embodiment according to FIG. 4 differs from the first embodiment essentially in that the movement into one
  • the various lateral positions for the respective service functions of a service facility are, as shown, for example position for scraping or removing contaminants on the surface of an element (not shown in this embodiment) in which pressure nozzles 66a, 66b and 66c are formed , and position for sealing by means of a closure device 60 of precisely those nozzles 66a, 66b and 66c.
  • the print head 52 can have a plurality, for example as shown, of three print modules 64a, 64b and 64c, which are laterally offset in a housing in the transverse direction, i.e. perpendicular to the printing direction and direction of movement of the printed material B.
  • Printhead 52 are held, as is particularly clear from the plan view of FIG. 6 and bottom view of FIG. 7.
  • the amount of the lateral offset of the printing modules 64a, 64b and 64c to one another corresponds at most to the elongated extension L of the plurality of nozzles 66a, 66b and 66c, with an overlap, ie a smaller offset than the extension L, is also conceivable.
  • the print head 52 is guided over bearing points, for example by means of two guide rails 54a and 54b arranged one above the other, so that the remaining degrees of freedom of the print head 52, in particular the height above the printed matter, are clearly defined and only a lateral movement can take place.
  • This movement of the print head 52 into different positions can take place via a drive (not shown in more detail), for example via a stepper motor which is controlled by a control unit, so that mechanical engagement, for example by means of mutually interacting latching means in bearing points 68a and 68b and recesses or projections at corresponding points on guides 54a and 54b is not necessarily required.
  • the print head 52 can be moved into or out of its print position with exact positions for the print position and different positions for the different service facilities, for example by means of a toothed belt and an electric stepping motor or the like. to be controlled.
  • the movement of the print head 52 without interruption of the printing process even during printing pauses, that is to say during a brief interruption in the ejection of ink through nozzles 66a, 66b and 66c, such as, for example, after a print pattern on a good has ended, the printed goods moving along direction B to to the next position for the next print pattern and / or change from one print item to another on request, permanently or according to predefined intervals.
  • Such printing breaks can be used according to the invention in addition to service functions at the end or at the beginning of a printing process for service functions, for example scraping or scraping off by means of a parking device, wiping the nozzles, rinsing or closing the nozzles or a combination thereof, so that the print quality changes during a printing process can advantageously be increased.
  • pause times of less than 1 s or even 0.5 s can be used for the above-mentioned service functions or at least one of them.
  • the printing method described above for the second embodiment, or taking advantage of the printing breaks for service functions can also be implemented in a corresponding manner with the first embodiment, with a rapid movement being used instead of a lateral movement Swiveling movement from the printing position and back into the printing position takes place.
  • the first embodiment could also be combined by a combination of the pivoting movement shown there with a corresponding lateral drive according to the second embodiment for the above-described lateral control before a printing process or in
  • Print pauses can be used during a printing process to avoid laborious manual shifting to the corresponding printing position.

Landscapes

  • Ink Jet (AREA)

Abstract

La présente invention concerne une imprimante à jet d'encre permettant notamment de marquer des produits d'expédition. Cette imprimante à jet d'encre comprend une tête d'impression qui présente plusieurs buses servant à éjecter de l'encre et qui peut prendre une position d'impression fixe, ainsi qu'un système de service, qui permet de réaliser au moins une fonction de service. La tête d'impression peut se déplacer latéralement (A) par rapport à la direction d'impression (B), le long d'une coulisse (54), de façon à pouvoir venir, avec ses buses, en position d'impression et à pouvoir s'en retirer et de façon à pouvoir se déplacer latéralement dans une position de service qui est différente de la position d'impression, au moyen du système de service. La présente invention concerne également un procédé pour mettre en oeuvre cette imprimante à jet d'encre.
PCT/DE2001/004686 2000-12-13 2001-12-12 Imprimante a jet d'encre permettant notamment de marquer des produits d'expedition WO2002047911A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10062012A DE10062012A1 (de) 2000-07-26 2000-12-13 Tintenstrahldrucker, insbesondere zur Beschriftung von Versandstücken
DE10062012.4 2000-12-13

Publications (2)

Publication Number Publication Date
WO2002047911A2 true WO2002047911A2 (fr) 2002-06-20
WO2002047911A3 WO2002047911A3 (fr) 2002-09-26

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PCT/DE2001/004686 WO2002047911A2 (fr) 2000-12-13 2001-12-12 Imprimante a jet d'encre permettant notamment de marquer des produits d'expedition

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1454750A2 (fr) * 2003-03-06 2004-09-08 Hewlett-Packard Development Company, L.P. Système d'entretien et procédé
EP1762996A1 (fr) 2000-03-13 2007-03-14 Honeywell International Inc. Système intégré de sécurité et de communications
EP1777162A1 (fr) 2005-10-21 2007-04-25 British-American Tobacco (Germany) GmbH Impression d'emballages sur une ligne de convoyage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5138334A (en) * 1990-11-05 1992-08-11 Xerox Corporation Pneumatic surface cleaning method and apparatus for ink jet printheads
EP0704306A1 (fr) * 1994-09-30 1996-04-03 SHARP Corporation Dispositif d'enregistrement à jet d'encre
EP0724959A1 (fr) * 1995-01-31 1996-08-07 Hewlett-Packard Company Système de recouvrement humide pour têtes d'impression à jet d'encre
US5640182A (en) * 1994-10-24 1997-06-17 Lexmark International, Inc. Universal ink-jet printhead maintenance station
EP0997290A1 (fr) * 1998-10-27 2000-05-03 Eastman Kodak Company Nettoyage à ultrason à haute fréquence pour cartouches de tête d'impression à jet d'encre
DE20012946U1 (de) * 2000-07-26 2000-09-21 Rena Informationstech Gmbh Tintenstrahldrucker, insbesondere zur Beschriftung von Versandstücken

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5138334A (en) * 1990-11-05 1992-08-11 Xerox Corporation Pneumatic surface cleaning method and apparatus for ink jet printheads
EP0704306A1 (fr) * 1994-09-30 1996-04-03 SHARP Corporation Dispositif d'enregistrement à jet d'encre
US5640182A (en) * 1994-10-24 1997-06-17 Lexmark International, Inc. Universal ink-jet printhead maintenance station
EP0724959A1 (fr) * 1995-01-31 1996-08-07 Hewlett-Packard Company Système de recouvrement humide pour têtes d'impression à jet d'encre
EP0997290A1 (fr) * 1998-10-27 2000-05-03 Eastman Kodak Company Nettoyage à ultrason à haute fréquence pour cartouches de tête d'impression à jet d'encre
DE20012946U1 (de) * 2000-07-26 2000-09-21 Rena Informationstech Gmbh Tintenstrahldrucker, insbesondere zur Beschriftung von Versandstücken

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1762996A1 (fr) 2000-03-13 2007-03-14 Honeywell International Inc. Système intégré de sécurité et de communications
EP1454750A2 (fr) * 2003-03-06 2004-09-08 Hewlett-Packard Development Company, L.P. Système d'entretien et procédé
EP1454750A3 (fr) * 2003-03-06 2004-11-17 Hewlett-Packard Development Company, L.P. Système d'entretien et procédé
US6851787B2 (en) 2003-03-06 2005-02-08 Hewlett-Packard Development Company, L.P. Printer servicing system and method
EP1777162A1 (fr) 2005-10-21 2007-04-25 British-American Tobacco (Germany) GmbH Impression d'emballages sur une ligne de convoyage

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