EP0714777B1 - Dispositif pour détecter le mauvais fonctionnement d'une tête d'impression à jets d'encre d'une machine d'affranchissement - Google Patents

Dispositif pour détecter le mauvais fonctionnement d'une tête d'impression à jets d'encre d'une machine d'affranchissement Download PDF

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Publication number
EP0714777B1
EP0714777B1 EP19950402674 EP95402674A EP0714777B1 EP 0714777 B1 EP0714777 B1 EP 0714777B1 EP 19950402674 EP19950402674 EP 19950402674 EP 95402674 A EP95402674 A EP 95402674A EP 0714777 B1 EP0714777 B1 EP 0714777B1
Authority
EP
European Patent Office
Prior art keywords
printing
nozzles
ink
photo
diagonal
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.)
Expired - Lifetime
Application number
EP19950402674
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0714777A1 (fr
Inventor
Michel Fajour
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.)
Quadient Technologies France SA
Original Assignee
Neopost Technologies SA
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 Neopost Technologies SA filed Critical Neopost Technologies SA
Publication of EP0714777A1 publication Critical patent/EP0714777A1/fr
Application granted granted Critical
Publication of EP0714777B1 publication Critical patent/EP0714777B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J2/005—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
    • B41J2/16579—Detection means therefor, e.g. for nozzle clogging
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00508—Printing or attaching on mailpieces
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00467—Transporting mailpieces
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00185—Details internally of apparatus in a franking system, e.g. franking machine at customer or apparatus at post office
    • G07B17/00314—Communication within apparatus, personal computer [PC] system, or server, e.g. between printhead and central unit in a franking machine
    • G07B2017/00338—Error detection or handling
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00508—Printing or attaching on mailpieces
    • G07B2017/00516—Details of printing apparatus
    • G07B2017/00524—Printheads
    • G07B2017/00532—Inkjet
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00508—Printing or attaching on mailpieces
    • G07B2017/00516—Details of printing apparatus
    • G07B2017/00556—Ensuring quality of print
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00508—Printing or attaching on mailpieces
    • G07B2017/00637—Special printing techniques, e.g. interlacing
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00459—Details relating to mailpieces in a franking system
    • G07B17/00661—Sensing or measuring mailpieces
    • G07B2017/00709—Scanning mailpieces

Definitions

  • the invention relates to a device for detecting a malfunction of at least one nozzle in a head inkjet printing with a specified number nozzles.
  • a machine postage meter having a jet print head ink having a plurality of nozzles for printing on postal items to post variable characters like the figures of a postal amount.
  • Inkjet printhead is susceptible of failure.
  • a print head failure at ink jets can result from ink drying in the nozzles which are then blocked or blocked.
  • An interruption extended nozzle operation, replacing the ink cartridge supplying the nozzles, an ink defect are still causes during the activation of the nozzles an inkjet printhead has failed.
  • one or several digits of a postal amount printed by the head printing on each mail item processed by the machine may or may be unreadable.
  • the Administration Postal requires that the postage amounts be legibly printed on mail items.
  • the object of the invention is to solve this problem by proposing a device capable of detecting whether one or more nozzles of an inkjet printhead is or are defective.
  • the malfunction of a nozzle must be detected when the nozzle does not eject ink while it is activated or ejects ink then that it is disabled.
  • Another object of the invention is to propose a franking machine equipped with a printing head ink jets in which the malfunction of a or more print head nozzles are detected automatically before printing a postal motif on a mail item processed by the machine.
  • Certain Postal Administrations such as the British Administration, require that codes to bars (simple or modulated in length) are included in the postal motif printed on mail items freed. These bar codes are intended to be read again automatically for the organization that ships the items of mail. It is important to ensure that bar codes printed by an inkjet printhead be machine readable before entrusting items prepaid to the carrier.
  • Another object of the invention is to offer such a franking machine in which part of the elements constituting the device nozzle malfunction detection is also used checking the readability of bar codes making part of the postal motif.
  • this device comprises a means to advance print media under the head printing in a direction of travel.
  • a unit control like a microprocessor, operates the print head according to a nozzle activation sequence so that the nozzles are activated at the same time, a number of times equal to the determined number of nozzles in the print head, for printing ink dots in a first rectangular area on the print medium.
  • This control unit then operates the head printing according to a nozzle deactivation sequence so that the nozzles are deactivated at the same time number of times equal to said number determined to prevent printing ink dots in a second area rectangular on the print medium.
  • a photo-detector means is ordered to photo-detect if a diagonal of the first rectangular area has a number of ink dots equal to the determined number and for photo-detecting if a diagonal of the second rectangular area does not have ink dots.
  • This photo-detector means outputs a signal having, in response to detection the determined number of ink dots on the first diagonal, a first level during a first window of time corresponding to the time required to scan said first diagonal and having, in response to the detection of the absence of ink dots on the second diagonal, a second level for a second window of time corresponding to the time required to scan the second diagonal.
  • a means is provided for processing the signal in output of the photodetector means so as to detect a signal transition from the first level to the second level during the first time window, this transition being indicative that a nozzle did not print an ink dot in response to its activation, and so as to detect a signal transition from second level to first level during the second time window, this transition being indicative that a nozzle has printed an ink dot in response upon deactivation.
  • Figure 1 shows schematically the device according the invention forming part of a machine postage.
  • Figures 2A and 2B schematically show the arrangement of ink dots printed by the head print and arrangement of the head nozzles printing.
  • Figure 3 shows the shape of the output signal of the photo-detector and representative of the reading of the ink dot arrangement shown in Figure 2.
  • Figure 4 shows schematically, seen from below, a first example of a photo-detector for the device according to the invention.
  • FIG 5 shows schematically the photodetector of Figure 4, seen from the front.
  • Figure 6 schematically shows a second example of a photo-detector, seen from the front, for the device according to the invention.
  • Figure 7 shows an example of a postal imprint with bar codes.
  • FIG. 1 The main components of the device according to the invention are shown in Figure 1. These components are part of a franking machine mail like envelopes or labels intended to be affixed to mail items.
  • a label 2 is moved by a conveyor system 1 in direction D under the jet head 3 ink whose malfunction is checked automatically before undertaking operations postage.
  • Label 2 which serves as a printing medium during the control operation comes from a distributor automatic labeling 4, classic in itself, so that the control operation can be performed automatically without operator intervention.
  • This operation of control can take place for example at the time of setting powered by the franking machine, between two franking operations or even after stopping prolonged operation of the machine following its power up.
  • the print head 3 has a plurality of nozzles B (10 are visible in Figure 2B) which are arranged in a row (or more) extending transverse to direction D, in the case of example perpendicular to direction D. Note that in the embodiment considered, the print head comprises approximately 256 nozzles distributed over approximately 30 millimeters.
  • the device also includes a control unit and treatment indicated by 5 which is preferably a microprocessor under the control of a recorded program in a memory (not shown).
  • Unit 5 controls the label dispenser 4 so that a label 2 is automatically supplied under the print head 3 for start the control operation.
  • Unit 5 also supplies the print head 3 with a parallel line 30 a word made up of several bytes to control the activation or deactivation of each nozzle.
  • each binary word has as many bits that there are nozzles in the print head. following the logical state of a bit in the binary word, the nozzle which corresponds to this bit is activated or deactivated, i.e. ejects an ink droplet or not.
  • Several words binaries should usually be sent in sequence to the print head to print a pattern like a number of a postal amount.
  • all the bits of a word binary transmitted to the print head are in the state logic 1 or in logic state 0, all the nozzles are activated at the same time or deactivated at the same time.
  • binary word submissions are synchronized with a signal proportional to the speed according to which media is moved by the system 1.
  • the unit 5 is programmed so as to send a sequence of words to the print head binary whose all bits are in logical state 1 for activate all nozzles at the same time a number of times equal to the number of nozzles in the print head. If all nozzles are working properly, ink dots, regularly spaced between them, are printed in a first rectangular area 20 on label 2 as visible in Figure 2A. It is understood that the points of ink P partially overlap on lines L and transversely to these lines L although they are shown spaced from each other.
  • Unit 5 is also programmed to send to the print head, a sequence of binary words all of which the bits are in logic state 0 to deactivate all nozzles at the same time a number of times equal to the number of head 3 nozzles to prevent them from printing a dot ink in a second rectangular area 21 on label 2. If all the nozzles are working correctly, the second rectangular area does not have of ink dots.
  • the nozzle deactivation sequence follows the nozzle activation sequence so as to keep the same printing resolution of ink dots P according to the direction D in the two rectangular areas 20 and 21 and between them as shown in Figure 2A.
  • the device also includes a photo-detection device 6 which is mounted downstream of the print head 3 in direction D and under which is moved label 2 with the following ink dots P the arrangement indicated above.
  • This organ 6 must be suitable to operate on a small analysis area shown on the figure 2A by a small rectangle ZA inside the zones rectangular 20 and 21.
  • the resolution of the organ 5 along the vertical in the figure 2 must be at most equal to the distance between two lines L successive along the vertical.
  • the member 5 includes a source of light which is directed at a particular area ZA analysis on the label.
  • the organ 5 generates an output signal whose amplitude is proportional to the amount of light reflected by this zone ZA. This amount of light varying depending on whether an ink dot is printed or not in the analysis area ZA, the amplitude of the output signal is therefore indicative of the presence or the absence of an ink point in an area analyzed ZA.
  • the member 6 is controlled by the unit 5 to successively photo-detect if an ink dot P is present in each of the first ZA analysis areas located on a diagonal of the rectangular area 20.
  • the body 6 outputs a signal whose the amplitude is at a substantially constant level V1 during the time window T0 required to scan the diagonal of zone 20.
  • the scanning starts in the example from a ZA zone located in the top right corner in the rectangular area 20.
  • Unit 6 is still controlled by unit 5 to successively photo-detect if an ink dot is present in each of the second ZA analysis zones located on a diagonal of the rectangular area 21. In response to detecting the absence of an ink dot in each zones ZA located on this diagonal, member 6 outputs a signal whose amplitude is at one level V0, different from level V1, during the time T1 required to scan the diagonal of zone 21.
  • the scan on the diagonal of the area 20 can just as well start from the bottom corner at right in area 20 in Figure 2A but it's preferable that the scan on the diagonal of the zone 21 begins on line L where the diagonal sweep ends zone 20 to simplify the control of the member 5, especially when the latter is mounted movable transversely to direction D.
  • the photodetector member 6 therefore delivers to unit 5 a signal S shown in Figure 3, the amplitude of which varies between a first level V0 indicative of the detection of the absence of an ink point in an area analyzed ZA and a second level V1 indicative of the detection of the presence of a ink point in this analyzed area.
  • Maintaining the signal S during the time window TO at level V1 indicates that all the print head nozzles have ejected ink droplets correctly when they have been activated by unit 5.
  • maintaining the signal S during time window T1 at level V0 indicates not all of the print head nozzles ejected ink droplets when they were deactivated by the unit 5.
  • Figure 3 shows the shape of the signal S when a nozzle particular did not eject an ink droplet during the time window T0 in response to its activation.
  • a nozzle In the when a nozzle is faulty (it does not eject ink while it is activated), there will be a line L in the rectangular area 20 which will be empty of ink dots.
  • the organ 5 sweeps across the diagonal of the zone 20, it will restore a signal S which will present a transition amplitude 3A between level V1 and level V0.
  • a line L in the rectangular area 21 which will be covered with ink dots.
  • the photo-detector occupies successive analytical positions which are identified by unit 5 which controls it. At each position analysis corresponds to a nozzle and therefore part of the signal S assigned to this particular nozzle so the unit 5 is also suitable for identifying the position of the faulty nozzle in the nozzle row of the print head 3.
  • the signal S at the output of the photo-detection member 6 is supplied in unit 5 to be processed, in particular under a digital form to detect a faulty nozzle and identify that nozzle.
  • a member such as a squeegee (not shown) which is mounted under the print head 3 to brush the nozzles under the control of unit 5 when the latter has detected that one or more faulty nozzles are ejecting no ink while activated.
  • unit 5 can initiate a purge cycle of the nozzle (s) failing by a selective activation command of that (s).
  • the photo-detection member 6 is a read head of type "S3906" from company "HAMAMATSU" constituted by a battery 61 of photo-detection cells (in the case of example 1024 cells). This head reading has gone up with respect to direction D of such way that the cells are aligned transversely to this direction D. As shown in FIGS. 4 and 5, the cell battery spans almost the entire width of label 2 which is moved here in a slide 64. A note that here there are more photo-detection cells than lines L. Therefore, it is not excluded that several photo-detection cells participate in the detection of the presence or absence of an ink dot on a line L.
  • Each cell (or more exactly each group of cells assigned to a line L) output a signal whose level is indicative of the presence or the absence of one or more ink dots on line L in question.
  • Each cell operates with a resolution in the direction perpendicular to D which is at most equal to the resolution of the print head following this perpendicular direction.
  • the resolution of a cell is about 1/40 of a millimeter while the resolution of the print head is about 1/8 of a millimeter.
  • cells can operate in parallel and therefore each output a signal having a amplitude varying between level V1 and the following level V0 that the successive analysis zones analyzed (due to the moving the label) have or have no points ink.
  • Each analysis zone that can be addressed selectively from unit 5 via line 60, the corresponding information from the cells is transmitted by a connector 63 mounted on a card printed circuit 62 at unit 5 for processing.
  • the photo-detection member 6 is constituted by a read head 66 of the "HEDS" type from the company "Hewlett-Packard” which is mounted mobile on an axis 67 to be move transversely to direction D under the action of a motor 68 controlled step by step by unit 5.
  • This head can be seen as a single cell head at the difference of the read head 61 insofar as it only works on an analysis area with a resolution of the order of 1/8 millimeter and restores in output a signal indicative of the presence or absence of an ink point in this analysis area.
  • unit 5 To the difference of the read head 61, it is not for unit 5 to successively select the outputs of several cells but to move a cell on successive analysis positions.
  • unit 5 therefore sends by line 30 to the engine a succession of command data to the motor 68 which moves the read head 66 successively above each line L while the label moves in the slide 64 perpendicular to the direction of movement of the head 66.
  • the machine franking has a working printhead 3 to print postal imprints with a code to bars as visible in FIG. 7.
  • the photo-detection member 6 is assigned to the reading of code bars and unit 5 to check the readability of code bars based on signal S.
  • a read head like head 61 is capable of providing several signals S in parallel to unit 5 for the bar code readability control height.
  • the postal imprint includes under the postage stamp a bar code 70 with height modulation.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP19950402674 1994-11-30 1995-11-28 Dispositif pour détecter le mauvais fonctionnement d'une tête d'impression à jets d'encre d'une machine d'affranchissement Expired - Lifetime EP0714777B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9414377A FR2727547A1 (fr) 1994-11-30 1994-11-30 Dispositif pour detecter le mauvais fonctionnement d'une tete d'impression a jets d'encre d'une machine d'affranchissement
FR9414377 1994-11-30

Publications (2)

Publication Number Publication Date
EP0714777A1 EP0714777A1 (fr) 1996-06-05
EP0714777B1 true EP0714777B1 (fr) 1998-09-02

Family

ID=9469325

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950402674 Expired - Lifetime EP0714777B1 (fr) 1994-11-30 1995-11-28 Dispositif pour détecter le mauvais fonctionnement d'une tête d'impression à jets d'encre d'une machine d'affranchissement

Country Status (3)

Country Link
EP (1) EP0714777B1 (enrdf_load_stackoverflow)
DE (1) DE69504458T2 (enrdf_load_stackoverflow)
FR (1) FR2727547A1 (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6276770B1 (en) 1998-11-17 2001-08-21 Pitney Bowes Inc. Mailing machine including ink jet printing having print head malfunction detection
US6350006B1 (en) 1998-11-17 2002-02-26 Pitney Bowes Inc. Optical ink drop detection apparatus and method for monitoring operation of an ink jet printhead
US6435642B1 (en) 1998-11-17 2002-08-20 Pitney Bowes Inc. Apparatus and method for real-time measurement of digital print quality
US6561612B2 (en) 1998-11-17 2003-05-13 Pitney Bowes Inc. Apparatus and method for real-time measurement of digital print quality

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0008180D0 (en) * 2000-04-05 2000-05-24 Neopost Ltd Printing of postal indicia and detection thereof
FR2829269B1 (fr) * 2001-08-31 2004-10-15 Neopost Ind Systeme modulaire universel de traitement de courrier
FR2830649B1 (fr) * 2001-10-05 2004-01-23 Neopost Ind Machine a affranchir munie d'un dispostif de controle de conformite de l'empreinte postale
US7438378B2 (en) 2004-08-30 2008-10-21 Pitney Bowes Inc. Fluorescent ink detector
US7878615B2 (en) 2005-12-14 2011-02-01 Pitney Bowes Inc. System and method for detecting defective ink jet nozzles
DE102007000547A1 (de) * 2007-10-21 2009-04-23 Telefrank Gmbh Frankiermaschine und Verfahren zur Steuerung einer Frankiermaschine
EP2615585A1 (en) * 2012-01-13 2013-07-17 Neopost Technologies Envelope dimensioning system
CN111439035B (zh) 2019-01-17 2022-03-18 海德堡印刷机械股份公司 改进的印刷喷嘴测试图案

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Publication number Priority date Publication date Assignee Title
US4484199A (en) * 1982-03-30 1984-11-20 Konishiroku Photo Industry Co., Ltd. Method and apparatus for detecting failure of an ink jet printing device
DE3246707A1 (de) * 1982-12-17 1984-06-20 Olympia Werke Ag, 2940 Wilhelmshaven Anordnung zum ueberpruefen von duesenaustrittsoeffnungen an tintenschreibkoepfen auf verstopfung oder verschmutzung in tintenschreibwerken
DE3305842A1 (de) * 1983-02-19 1984-08-23 Maatschappij van Berkel's, Patent N.V., Rotterdam Vorrichtung im matrix-drucker fuer warenbons, insbesondere waage mit bonausgabe
IT1187967B (it) * 1986-03-10 1987-12-23 Olivetti & Co Spa Aparecchio per la riproduzione digitale a colori di documenti
JPS63303755A (ja) * 1987-06-04 1988-12-12 Seiko Epson Corp インクジェットプリンタの噴射ミス検出方法
JP2728436B2 (ja) * 1988-06-23 1998-03-18 キヤノン株式会社 インクジェット記録装置
US4907013A (en) * 1989-01-19 1990-03-06 Pitney Bowes Inc Circuitry for detecting malfunction of ink jet printhead
JP3049663B2 (ja) * 1991-02-20 2000-06-05 キヤノン株式会社 記録装置及び記録方法
JP3176980B2 (ja) * 1992-04-27 2001-06-18 株式会社リコー 記録装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6276770B1 (en) 1998-11-17 2001-08-21 Pitney Bowes Inc. Mailing machine including ink jet printing having print head malfunction detection
US6350006B1 (en) 1998-11-17 2002-02-26 Pitney Bowes Inc. Optical ink drop detection apparatus and method for monitoring operation of an ink jet printhead
US6435642B1 (en) 1998-11-17 2002-08-20 Pitney Bowes Inc. Apparatus and method for real-time measurement of digital print quality
US6561612B2 (en) 1998-11-17 2003-05-13 Pitney Bowes Inc. Apparatus and method for real-time measurement of digital print quality
US6612676B1 (en) 1998-11-17 2003-09-02 Pitney Bowes Inc. Apparatus and method for real-time measurement of digital print quality

Also Published As

Publication number Publication date
EP0714777A1 (fr) 1996-06-05
FR2727547B1 (enrdf_load_stackoverflow) 1997-02-14
FR2727547A1 (fr) 1996-05-31
DE69504458D1 (de) 1998-10-08
DE69504458T2 (de) 1999-01-28

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