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EP0702334A1 - System zum Regeln von einem Tintenstrahldruckkopf in einer Frankiermaschine mittels Noniusregelung - Google Patents

System zum Regeln von einem Tintenstrahldruckkopf in einer Frankiermaschine mittels Noniusregelung Download PDF

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Publication number
EP0702334A1
EP0702334A1 EP95401956A EP95401956A EP0702334A1 EP 0702334 A1 EP0702334 A1 EP 0702334A1 EP 95401956 A EP95401956 A EP 95401956A EP 95401956 A EP95401956 A EP 95401956A EP 0702334 A1 EP0702334 A1 EP 0702334A1
Authority
EP
European Patent Office
Prior art keywords
nozzles
scale
rows
ink droplets
ink
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
EP95401956A
Other languages
English (en)
French (fr)
Other versions
EP0702334B1 (de
Inventor
Michel Fajour
Bernard Mourgues
Jean-Claude Haroutel
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 EP0702334A1 publication Critical patent/EP0702334A1/de
Application granted granted Critical
Publication of EP0702334B1 publication Critical patent/EP0702334B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G07B17/00508—Printing or attaching on mailpieces
    • G07B2017/00516—Details of printing apparatus
    • G07B2017/00524—Printheads
    • G07B2017/00532—Inkjet

Definitions

  • the invention relates to a franking machine comprising an ink jet printing head for printing a postal imprint on a franking article moved relative to the head in a direction of movement, this printing head comprising a plurality of nozzles arranged in at least two rows extending transversely to the direction of movement, these two rows being spaced from one another by a distance D in this direction and a control means being provided for controlling the succession chronological ejection of ink droplets from the plurality of nozzles so as to delay the ejection of ink droplets from the nozzles of one of the two rows relative to that of the nozzles of the other row by a delay R based on previously recorded data representative of an estimate of the distance D.
  • Such a franking machine is known from document US-5083153.
  • Inkjet printing gives postage machines great flexibility, particularly when it comes to printing postal items on mail items with both variable characters, such as digital symbols a postage amount, and color schemes, such as advertising flames.
  • the two rows of nozzles can be respectively part of two different housings mutually offset transversely and longitudinally to the direction of travel.
  • ink jet nozzles for example boxes comprising 64 or 128 nozzles, which are now widely distributed at very low prices to equip jet printers.
  • These inkjet printing units have a resolution of approximately 200 nozzles per inch which is suitable for printing a postal imprint.
  • the linear mark printed by a box comprising for example 128 nozzles extends over approximately 16mm. It is therefore understood that two boxes comprising a row of 128 nozzles each make it possible to print a linear mark over a length of approximately 30mm which corresponds to the height of a postal imprint.
  • the information to be printed by such a franking machine on a mail fold or a label intended to be affixed on such a fold is recorded in digital form in a memory and partially transmitted to an interface circuit which, under the control of the control means, simultaneously operates the nozzles of the row most upstream in the direction of movement. Then after the delay R during which the fold or label is moved by the distance D, another part of the information in the memory is transmitted to the interface circuit which activates simultaneously all the nozzles of the other row of in such a way as to finish the impression of the linear mark.
  • This type of operation can extend to a number of rows of nozzles greater than two.
  • the delay R in question can be given by a clock circuit at a fixed frequency if the variations in the speed of movement V of the fold or label under the print head are not taken into account or otherwise at frequency synchronized on a representative signal the speed of movement of the fold or label detected in real time by an appropriate speed sensor, for example an optical sensor. It is understood that the delay R varies as a function of the ratio D / V and that an imprecise estimate of the distance D leads to the appearance of a defect in alignment of the points constituting the linear mark printed on the fold or the label, fault which can be eliminated by adjusting the value of the previously recorded data representative of the distance D.
  • the object of the invention is to provide a simple solution for adjusting this data.
  • control means is arranged to control a first chronological sequence of ejection of ink droplets from the nozzles of one of the rows so as to print a first graduated rectilinear scale divided into first equal intervals along the direction movement and to control, after the delay R beginning at the start of said first sequence, a second chronological sequence of ejecting ink droplets from the nozzles of the other row so as to print a second straight graduated scale divided into seconds equal intervals in the direction of movement and smaller than the first intervals, this second scale constituting a vernier associated with the first scale in order to obtain an error value for the adjustment of the recorded data.
  • the adjustment of the recorded data requires only one visual examination, this examination consisting in locating two graduations which are arranged in alignment with one another, one forming part of the first scale, the other being part of the second scale.
  • control means is arranged to control the ejection of ink droplets from the plurality of nozzles so as to print symbols next to one of the straight scales, each symbol corresponds to a particular error value.
  • optical sensors are arranged downstream of the print head in the direction of movement of a support on which the graduations of the scales are printed, these sensors supplying signals representative of a chronology of detections of these graduations on the basis of which the recorded data representative of the distance D is adjusted automatically.
  • the invention extends to a method for adjusting such a franking machine according to which the first and second rectilinear scales are advantageously printed on a label in the case where the franking machine includes an automatic label dispenser.
  • Figure 1 is a block diagram of the printhead forming part of a franking machine according to the invention on which appears an arrangement of the nozzles of the printhead in two parallel rows.
  • Figures 2 to 6 show examples of printing rectilinear scales useful for adjusting the recorded data representative of the distance D.
  • FIG. 7 shows two rows of nozzles partially overlapping in the direction of travel.
  • the franking machine in FIG. 1 comprises a conveyor system which moves the mail item 1 to be franked under a stationary ink jet print head 2 in the direction of movement F.
  • the print head here comprises two housings such as 20 and 21, each housing comprising a row of nozzles, each row including for example 128 nozzles regularly spaced apart by a distance of 1/200 inch, that is to say approximately 0.127 millimeter.
  • the boxes possibly having rows of nozzles of different sizes, for example a box with 128 nozzles and a box with 64 nozzles.
  • the housings 20 and 21 are identical.
  • the two housings are mounted in the print head in such a way that their rows of nozzles extend transversely to direction F, the two housings being offset relative to each other transversely and longitudinally to direction F.
  • the nozzles are represented by crosses in FIG. 1.
  • the arrangement of the two housings 20 and 21 is such that the distance between the last nozzle B128 of the housing 20 (the one uppermost in FIG. 1) and the first nozzle B '1 of the housing 21 (the lowest one in FIG. 1) is at least equal to the height H of a postal imprint 10 represented by the rectangle in broken lines on the article 1. It is therefore understood that the dimension of each row of nozzles and the height of the postal imprint determine the number of boxes required for printing the postal imprint.
  • these two housings 20, 21 are mounted in such a way that the first nozzle B1 of the housing 20 (that of the lowest housing 20 in FIG. 1) is spaced from the last nozzle B'128 of the housing 21 (that of the housing 21 uppermost in FIG. 1), in the direction perpendicular to the direction F, by a distance equal to approximately 0.127 millimeter (that is to say the distance between two consecutive nozzles of one or the other rows of nozzles).
  • the two rows of nozzles R1 and R2 are spaced from each other by a distance D in the direction F of about 1cm.
  • the franking machine further comprises a control unit 3, such as a microprocessor and a program stored in a memory not shown, which is connected to control the chronological succession of ejections of ink droplets from the nozzles, in response to a signal d clock synchronized or not with the speed of movement of the fold or label under the print head 2, so that it is possible to produce dots on the fold or label which join together with a slight overlap along straight lines parallel to the direction F.
  • a control unit 3 such as a microprocessor and a program stored in a memory not shown, which is connected to control the chronological succession of ejections of ink droplets from the nozzles, in response to a signal d clock synchronized or not with the speed of movement of the fold or label under the print head 2, so that it is possible to produce dots on the fold or label which join together with a slight overlap along straight lines parallel to the direction F.
  • the unit 3 delays the ejection command of ink droplets from the nozzles of row R2 (the nozzles of the housing 21 which is furthest downstream in the direction F) with respect to the command for ejecting the ink droplets from the nozzles of row R1 (the nozzles of the box 20 which is most upstream in the direction F), with a delay R varying as a function of the ratio d / V or d is the adjustable data item previously recorded in memory and representative of the distance D.
  • the distance D varies from one print head to another. Furthermore, it is very difficult to measure, with all the desired precision, the distance D. Consequently, after assembly of the housings 20 and 21, a data d is loaded into the unit 3, the value of which is an estimate (generally imprecise) of the distance D which must then be adjusted.
  • control unit 3 To adjust this datum d so as to obtain a linear mark whose points (formed by the ink droplets) are satisfactorily aligned transverse to the direction F, the control unit 3 is arranged as follows.
  • the unit 3 in response to the input of a control signal for example, commands a first chronological sequence d ejection of ink droplets from the nozzles of the housing 20 so as to print on a paper support (such as the envelope 1 or the like) moved under the print head 2 in the direction F, a first series of linear graduations transverse to direction F and constituting a first rectilinear scale divided into first equal intervals.
  • a paper support such as the envelope 1 or the like
  • the unit 3 also controls, in response to this control signal, a second chronological sequence of ejections of ink droplets from the nozzles of the housing 21, from the instant t + R, so as to print , on this support, a second series of linear graduations transverse to the direction F and constituting a second rectilinear scale divided into second equal intervals but smaller than the first intervals.
  • This second scale constitutes a vernier associated with the first scale and by simple visual examination of the coincidence between a graduation forming part of the first scale and a graduation forming part of the second scale, it is easy to determine an error value which corresponds the difference between the recorded data representative of the estimate of the distance D and the exact value of this distance D. Depending on the difference between the intervals of the two scales, this error can be obtained with the desired precision.
  • Figures 2 to 6 show examples of printing scales, the first scale being referenced by 110 and the second by 111 while the print medium is referenced 11.
  • Numerical symbols like 1 to 9, generally available for printing of a postage amount, are also printed next to the graduations of the first scale.
  • the first graduations printed by the printhead are those located most to the left in FIGS. 2 to 6. It is understood that if the first graduation of the scale 110 is straight-eye with the first graduation of 'scale 111, the data d is an exact estimate of the distance D (as shown in Figure 4). Otherwise, the error value determined by visual examination is to be subtracted or added, as the case may be, to the data d recorded.
  • the unit 3 can be arranged to accept control data representative of the size of the intervals A and B for the two scales on the basis of which it can adapt the length of the scales to a desired length of the printing medium, for example for facilitate visual examination of scales.
  • the distance between two consecutive dots printed on a longitudinal line in direction F corresponds to a printing pitch set to 1/200 inch, or approximately 0.127mm.
  • the size of the housings 20 and 21 generally makes it possible to mount them offset longitudinally in the direction F so that the distance D is approximately 100 printing steps, that is to say approximately 1.27 mm. If by order, A is fixed at 50 steps (that is to say approximately 6.35mm) and B is fixed at 49 steps (that is to say approximately 6.223mm), it is enough for 50 graduations on the two rectilinear scales 110 and 111 to obtain a value of error with an accuracy of 2/100 steps.
  • the housings 20 and 21 are mounted in such a way that the row of nozzles R1 partially overlaps the row of nozzles R2 in the direction F as shown in FIG. 7 (i.e. the two rows of nozzles R1 and R2 have a common printing area which is located in the middle of the height H). It follows that the graduations of the two scales 110 and 111 overlap in part as shown in Figures 2 to 6. However, in this case, when printing a postal imprint, it is necessary to prohibit the operation of some of the nozzles in either of the two rows to avoid printing defects. For example, with reference to FIG. 7, the unit 3 should prohibit the operation of the nozzles B1 to B3.
  • two optoelectronic sensors 22 and 23 are provided in the print head (or outside of it) downstream of the two rows R1 and R2 in the direction F. These photo detection sensors 22 and 23 are mounted in such a way that the sensor 22 detects the graduations of the scale 110 and the sensor 23 detects the graduations of the scale 111. Each sensor provides a signal which is representative of a chronology of detections of graduations of a scale. In FIG. 1, the signals 22S and 23S each have two peaks which correspond to the detection of two successive graduations of a scale.
  • the time interval between two graduations of the scale 110 is larger than the interval between two graduations of the scale 111, it follows that the time interval between two peaks of the signal 22S is greater than the interval of time between two peaks of the 23S signal.
  • These signals are supplied, after digitization, to the unit 3 which counts the number of peaks present in the signals 22S and 23S since the beginning of the adjustment phase, compares in time the occurrence of the peaks in the signal 22S with l occurrence of the peaks in the signal 23S so as to find a particular peak in the signal 22S which is in phase with a particular peak in the signal 23S and which, on the basis of the sequence number of these particular peaks (according to the accounting established), determines the error value relating to the data item d and finally adjusts the latter automatically.
  • the support 11 used for printing the scales 110 and 111 is preferably a label which is provided by an automatic label dispenser (not shown) fitted to the franking machine and which is moved under the print head. It is unit 3 which controls the label dispenser, in response to the pressing of a key on the keyboard of the franking machine for example, so that the operation for adjusting the data item d done without an operator having to intervene. It is understood that printing the scales on a label is advantageous even in the case of a visual examination of the scales because it dispenses the operator from having to insert an envelope or other medium in the franking machine.

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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)
EP19950401956 1994-09-16 1995-08-25 System zum Regeln eines Tintenstrahldruckkopfs in einer Frankiermaschine durch Nutzung eines Noniuseffekts Expired - Lifetime EP0702334B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9411074 1994-09-16
FR9411074A FR2724591B1 (fr) 1994-09-16 1994-09-16 Systeme de reglage par effet vernier d'une tete d'impression a jet d'encre dans une machine d'affranchissement

Publications (2)

Publication Number Publication Date
EP0702334A1 true EP0702334A1 (de) 1996-03-20
EP0702334B1 EP0702334B1 (de) 2001-01-24

Family

ID=9467004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950401956 Expired - Lifetime EP0702334B1 (de) 1994-09-16 1995-08-25 System zum Regeln eines Tintenstrahldruckkopfs in einer Frankiermaschine durch Nutzung eines Noniuseffekts

Country Status (3)

Country Link
EP (1) EP0702334B1 (de)
DE (1) DE69519969T2 (de)
FR (1) FR2724591B1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0855272A1 (de) * 1997-01-24 1998-07-29 Neopost Industrie Druckkopf für Poststücke mit Ausrichtvorrichtung
EP0997852A1 (de) * 1998-10-28 2000-05-03 Neopost Industrie Vorrichtung zum Drucken von Postzeichen die lesbarer sind
US6106095A (en) * 1997-10-15 2000-08-22 Pitney Bowes Inc. Mailing machine having registration of multiple arrays of print elements
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
EP2639069A1 (de) * 2012-03-15 2013-09-18 Till GmbH Verfahren zum Feststellen von Fehlern in der Ausrichtung von Druckbildern und zur Durchführung des Verfahrens eingerichtete Druckstation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013003181A1 (de) * 2013-02-25 2014-08-28 Heidelberger Druckmaschinen Ag Verfahren zum Erzeugen eines Druckbildes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4238804A (en) * 1979-02-28 1980-12-09 Xerox Corporation Stitching method and apparatus for multiple nozzle ink jet printers
JPS5672964A (en) * 1979-11-16 1981-06-17 Fujitsu Ltd Multinozzle device
EP0034060A1 (de) * 1980-02-08 1981-08-19 The Mead Corporation Tintenstrahldrucker
US4907013A (en) * 1989-01-19 1990-03-06 Pitney Bowes Inc Circuitry for detecting malfunction of ink jet printhead
US5038153A (en) * 1988-07-14 1991-08-06 Ascom Hasler Ag. Franking machine
US5083153A (en) 1990-08-17 1992-01-21 Eastman Kodak Company Film transporting apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4238804A (en) * 1979-02-28 1980-12-09 Xerox Corporation Stitching method and apparatus for multiple nozzle ink jet printers
JPS5672964A (en) * 1979-11-16 1981-06-17 Fujitsu Ltd Multinozzle device
EP0034060A1 (de) * 1980-02-08 1981-08-19 The Mead Corporation Tintenstrahldrucker
US5038153A (en) * 1988-07-14 1991-08-06 Ascom Hasler Ag. Franking machine
US4907013A (en) * 1989-01-19 1990-03-06 Pitney Bowes Inc Circuitry for detecting malfunction of ink jet printhead
US5083153A (en) 1990-08-17 1992-01-21 Eastman Kodak Company Film transporting apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 5, no. 139 (M - 086) 3 September 1981 (1981-09-03) *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2758762A1 (fr) * 1997-01-24 1998-07-31 Neopost Ind Tete d'impression postale munie d'un dispositif de reglage d'alignement
US6048048A (en) * 1997-01-24 2000-04-11 Neopost Industrie Postal printhead provided with a device for adjusting alignment
EP0855272A1 (de) * 1997-01-24 1998-07-29 Neopost Industrie Druckkopf für Poststücke mit Ausrichtvorrichtung
US6106095A (en) * 1997-10-15 2000-08-22 Pitney Bowes Inc. Mailing machine having registration of multiple arrays of print elements
US6895395B1 (en) 1998-10-28 2005-05-17 Neopost Industrie Postal printing device with facilitated reading
EP0997852A1 (de) * 1998-10-28 2000-05-03 Neopost Industrie Vorrichtung zum Drucken von Postzeichen die lesbarer sind
FR2785427A1 (fr) * 1998-10-28 2000-05-05 Neopost Ind Dispositif d'impression postale a lecture facilitee
US6276770B1 (en) 1998-11-17 2001-08-21 Pitney Bowes Inc. Mailing machine including ink jet printing having print head malfunction detection
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
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
EP2639069A1 (de) * 2012-03-15 2013-09-18 Till GmbH Verfahren zum Feststellen von Fehlern in der Ausrichtung von Druckbildern und zur Durchführung des Verfahrens eingerichtete Druckstation

Also Published As

Publication number Publication date
DE69519969T2 (de) 2001-07-05
DE69519969D1 (de) 2001-03-01
FR2724591B1 (fr) 1997-01-31
EP0702334B1 (de) 2001-01-24
FR2724591A1 (fr) 1996-03-22

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