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EP0696509A1 - Frankiermaschine mit einem Tintenstrahldruckkopf - Google Patents

Frankiermaschine mit einem Tintenstrahldruckkopf Download PDF

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Publication number
EP0696509A1
EP0696509A1 EP95401566A EP95401566A EP0696509A1 EP 0696509 A1 EP0696509 A1 EP 0696509A1 EP 95401566 A EP95401566 A EP 95401566A EP 95401566 A EP95401566 A EP 95401566A EP 0696509 A1 EP0696509 A1 EP 0696509A1
Authority
EP
European Patent Office
Prior art keywords
nozzles
row
control means
postal
printing
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
EP95401566A
Other languages
English (en)
French (fr)
Other versions
EP0696509B1 (de
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 EP0696509A1 publication Critical patent/EP0696509A1/de
Application granted granted Critical
Publication of EP0696509B1 publication Critical patent/EP0696509B1/de
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
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/1652—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head
    • 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
    • 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

Definitions

  • the invention relates generally to the field of franking machines which are now widely used in corporate mail forwarding offices.
  • It relates more particularly to a franking machine comprising an ink jet print head.
  • inkjet printing is already widely used in the field of document printing and is increasingly replacing laser printing. Inkjet printing technology is only beginning to enter the field of franking machines in order to replace conventional printing by printing wheels.
  • An ink jet print head of a franking machine comprises a large number of mechanical or electronic elements in addition to the specific component carrying out ink jet printing.
  • a component is generally in the form of a small housing in which are mounted a plurality of nozzles forming a row of nozzles. These nozzles are supplied with ink by a micro pump drawing the ink from an ink tank. They are controlled by an electronic circuit which excites them individually to make them eject ink droplets.
  • Such inkjet printing elements are commercially available to equip printers intended to be connected to a microcomputer.
  • the range available of such elements is very varied.
  • the number of nozzles of such an element generally determines a dimension of the pattern which can be printed by it. If we take the example of an element with 256 nozzles having nozzles spaced apart by 1/200 inch, the dimension of the pattern capable of being printed by this element is therefore 32.5mm. In the case of an element with 128 nozzles, the dimension of the pattern capable of being printed is 16.25 mm for the same density of dots.
  • the postal motifs to be printed on folds by a franking machine must for example have a stamp height of 30mm. This dimension is imposed by the Postal Administration. It can vary from country to country. To print such patterns, it is possible to use several printing elements comprising 128 nozzles or 64 nozzles or a single element with 256 nozzles. In both cases, the inkjet printing element or elements are mounted in a franking machine in such a way that their row of nozzles is arranged substantially perpendicular to the direction of passage of the plies to be franked under the head of the franking machine. printing of the machine.
  • inkjet printing elements creates complications in nozzle management. It is easier to use an inkjet printhead with a row of 256 nozzles. In this case, it appears that some of the nozzles, in fact 16 nozzles in the nozzle row, do not have to be excited to print a postal motif because of its dimension of 30mm which is less than the length of the row of nozzles.
  • Each nozzle of an inkjet printing element is, for example, formed of two partitions made of a piezoelectric material. To eject an ink droplet from this nozzle, it suffices to deform the piezoelectric walls of the nozzle by applying an electric voltage thereto. If the 256 nozzles of such an element are numbered from B0 to B255, this element includes 257 piezoelectric partitions numbered from 0 to 256. Since 16 nozzles do not have to be energized, the partitions numbered 240 to 256 are not normally never excited by an electric voltage. As a result, the ink residing inside the nozzles B240 to B255 is never ejected.
  • the object of the invention is to remedy this drawback.
  • the subject of the invention is a franking machine comprising an ink jet print head including a row of nozzles operated selectively under the control of a control means with a view to printing a postal motif. on a fold passing in front of the print head and in which only the first consecutive nozzles of the row of nozzles forming a subset of the set of nozzles available in the row are operated by the control means for the postal motif printing, characterized in that the control means is also arranged to operate the other nozzles of the row of nozzles, different from the first nozzles, in the absence of a fold in front of the print head in view to drain those seconds nozzles so as to avoid fouling over time.
  • the arrangement of the control means makes it possible to prevent the ink residing inside the nozzles numbered B240 to B255 from inadvertently drying and blocking the operation thereof. and consequently the operation of the other nozzles.
  • an ink recovery tank is provided in the machine, this tank being arranged under the row of nozzles.
  • the control means is arranged to excite the nozzles B240 to B255 cyclically, as often as is necessary to avoid fouling, which is easy to do by program.
  • the excitation of the nozzles B240 to B255 preferably takes place in the time interval available after the passage of a fold in front of the print head and before the passage of a subsequent fold in front of the print head. This time interval is more than sufficient to carry out such an operation, which does not disturb the normal postage franking treatment and does not affect the franking rate of the machine.
  • control means is arranged to alternately operate different sub-assemblies of first nozzles, these sub-assemblies occupying offset positions within the set of nozzles available in the row of nozzles so as to excite over time all the nozzles of the row of nozzles.
  • Figure 1 is a perspective view of an ink jet printing element having a row of nozzles.
  • Figure 2 shows schematically a part of a franking machine having an ink jet print head.
  • Figure 3 illustrates the organization of the nozzles in the print head.
  • Figure 4 illustrates the second embodiment of the invention.
  • FIG. 1 A conventional inkjet printing element 1 is shown in FIG. 1. It is in the form of a small box which is extended by a ramp 2 of nozzles 3.
  • the ramp comprises in the case of example 256 nozzles aligned over approximately 32.5mm, the space between two consecutive nozzles being 1/200 inch.
  • This element is intended to be mounted in a printing head of a franking machine to print a postal motif designated by 4 in FIG. 1.
  • the postal motif has a dimension L2 of 30mm which is smaller than the length L1 from the row of nozzles 3 in the ramp 2. It is understood that only part of the nozzles 3 are useful for printing a postal motif.
  • FIG. 2 shows the franking machine with an inkjet print head and the print element 1 which is part of the print head 20. It is fixedly mounted on a support 21, for example a bracket, so as to overhang a guide plate 25 on which are moved in sequence, according to arrow F, folds such as 24 so that one face of each fold passes under the ramp 2 of nozzles.
  • the plies are moved on the plate 25 by rollers, belts and counter rollers per se (not shown) forming part of the franking machine.
  • the printing element 1 is controlled by the electronics of the franking machine.
  • This electronics conventionally comprises a microprocessor 40, a program memory 41 and an interface 42.
  • the interface 42 is a register addressable by the microprocessor which contains 32 bytes in which the microprocessor temporarily loads 256 control bits respectively for the 256 nozzles of the printing element 1.
  • a control bit at position 1 causes excitation of the nozzle which corresponds to it while a bit at position 0 prevents excitation of this nozzle.
  • a nozzle When a nozzle is excited, it ejects a droplet of ink.
  • the postal motif printed by the nozzles on the fold can take various forms which, for simplicity, are part of a rectangle having a width L2 of 30 mm and a length 12 of approximately 60mm.
  • the length L1 of the row of nozzles in the ramp 2 is therefore greater, by construction, than the width L2 of a pattern as indicated above.
  • the nozzle control bits are managed through a control program stored in the memory 41.
  • This program which controls the microprocessor 40 is arranged so as to load 256 control bits in the interface 42 at each printing cycle. , a franking cycle obviously comprising a large number of printing cycles.
  • the support plate 25 has an opening 26 opposite the row of nozzles and more particularly of the 16 nozzles in question and a reservoir 31 is placed inside the opening 26 to receive the ink ejected by these 16 nozzles when energized to drain.
  • the row of nozzles numbered B0-B255 is shown in Figure 3.
  • the nozzles B0-B239 are those which are operated by the program for printing a postal motif.
  • the B240-B255 nozzles are those that are not normally energized during a franking cycle. Since the nozzles normally not excited for the printing of a postal motif are arranged at one end of the nozzle ramp, a small reservoir 31, compact, suffices to receive the ink resulting from the emptying of these nozzles.
  • the set of nozzles used for printing a postal motif could equally well be defined by the nozzles B1-B240 or even B2-B241 or any other set consisting of 240 consecutive nozzles taken from the set of available nozzles of the row of nozzles.
  • the nozzles normally not energized when printing a postal motif are emptied cyclically, preferably after each franking cycle when no fold is present in front of the print head.
  • the control program is arranged so as to control the excitation of the nozzles B240 to B255 for example, for their emptying, in the time interval available after the passage of a fold in front the print head and before the next fold passes in front of the print head, this instant can be easily determined by means of optical sensors which detect the presence or absence of a fold in front of the opening 26.
  • the emptying of these nozzles can be done less often, for example every 10 franking cycles or when the franking machine is started as long as the emptying frequency is sufficient to avoid fouling of these nozzles.
  • FIG. 4 shows in more detail the microprocessor 40 connected to the interface circuit 42 by a data bus D0-D7.
  • the five A0-A4 address outputs of the microprocessor are connected by an address bus to the five A0-A4 address inputs of the interface circuit and are used to select in the interface circuit one of the 32 bytes together forming the 256 bits.
  • the 32 bytes of control bits are loaded sequentially into the interface circuit by the control program through the data bus and according to the addresses indicated by the address bus.
  • control program only manages the first 30 control bytes (useful bytes) for printing a postal motif. These 30 control bytes define a subset of nozzles from the set of nozzles available in the row of nozzles dedicated to printing a postal motif. The last two control bytes have bits set to the value 0 to prevent excitation of the corresponding nozzles, namely the B240-B255 nozzles.
  • control program is arranged in such a way that the 30 bytes useful for printing a postal motif are not always the first 30 bytes within the 32 bytes in the interface circuit.
  • This management of the useful bytes corresponds to a management of different subsets of useful nozzles, these subsets occupying offset positions within the set of nozzles available in the row of nozzles.
  • This offset corresponds to different configurations of addressing of the useful nozzles in the row of nozzles by the microprocessor, these configurations being easy to generate by program.
  • the control program maintains the control bits of the nozzles B240 to B255 at the value 0.
  • a postal motif is therefore printed on a first fold by the sole assistance of the nozzles B0 to B239.
  • the control program maintains the nozzle check bits B0, B241-B255 to the value 0.
  • the nozzles B1 to B240 participate in the printing of the postal motif. As a result, the latter is offset by a point in a direction perpendicular to the direction F with respect to the postal motif printed on the preceding fold.
  • the control program maintains the control bits of the nozzles B0-B1, B242-B255 at the value 0. Only the nozzles B2 to B241 are energized for printing a postal motif.
  • This offset can advantageously be carried out by an adder circuit, with an offset step corresponding to a control byte.
  • an adder 43 is interposed between the outputs of addresses A0-A4 of the microprocessor and the inputs of addresses A0-A4 of the interface circuit.
  • the adder comprises two series of address inputs A0-A4 and B0-B4 and a series of address outputs O1-O5 corresponding to an addition of the address inputs.
  • the address inputs A0-A4 of the adder circuit are connected to the address outputs A0-A4 of the microprocessor.
  • the address outputs O1-O5 of the adder circuit are connected to the address inputs A0-A4 of the interface circuit.
  • the address inputs B0-B1 of the adder circuit are connected to the address outputs A5-A6 of the microprocessor and the address inputs B2-B4 of the adder circuit are blocked at the value 0.
  • the inputs B0-B1 of the adder provide the offset value (in number of bytes) to be applied to the byte addresses provided by the A0-A4 inputs of the adder.
  • the system works as follows. At each printing cycle, the control program provides the first 30 useful control bytes for printing a postal motif and 2 bytes whose bits are forced to the value 0. This configuration of the 32 bytes generated by the printing program order remains the same during successive printing cycles and postage cycles. On the other hand, different byte address offset values (0.1 or 2) are applied alternately to the address inputs B0-B1 of the adder at each franking cycle.
  • the first 30 bytes in the interface circuit receive the 30 useful bytes generated by the control program. Only nozzles B0-B239 can be energized. The subset of nozzles useful for printing a postal motif occupies a first position in the set of nozzles available in the row of nozzles.
  • the offset value 1 is applied to the inputs B0-B1 of the adder and it is bytes 2 and 31 which receive the first 30 useful bytes generated by the control program. Only nozzles B8-B247 can be energized. According to this configuration of addressing the useful bytes, the subset of nozzles useful for printing a postal motif occupies a second position which is offset within the set of available nozzles in the row of nozzles by relative to the position occupied by the subset of nozzles useful in the previous franking cycle.
  • the offset value 2 is applied to the inputs B0-B1 of the adder and it is bytes 3 and 32 which receive the first 30 useful bytes generated by the control program. Only nozzles B16-B255 can be energized. According to this configuration of addressing the useful bytes, the subset of nozzles useful for printing a postal motif occupies a third position which is offset within the set of available nozzles in the row of nozzles by relative to the position occupied by the subset of nozzles useful in the previous franking cycle.
  • the nozzle control then continues, starting again as for the first franking cycle.
  • the control program is advantageously arranged to count, in counters associated respectively with the nozzles of the row of nozzles of the printing element 1, the number of times that each nozzle is excited and order the emission of a visual or audible message in order to warn the user of the franking machine when one of the counters exceeds a threshold value and / or block the operation of the franking machine in such a situation.
  • the threshold value corresponds to an average level of wear of the printing element. In this way, it is possible to avoid a partial printing of a postal motif on a fold due to the wear of one or more nozzles of the printing element.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Ink Jet (AREA)
  • Coating Apparatus (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP95401566A 1994-08-08 1995-06-29 Frankiermaschine mit einem Tintenstrahldruckkopf Expired - Lifetime EP0696509B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9409804 1994-08-08
FR9409804A FR2723339B1 (fr) 1994-08-08 1994-08-08 Machine d'affranchissement comportant une tete d'impression a jet d'encre

Publications (2)

Publication Number Publication Date
EP0696509A1 true EP0696509A1 (de) 1996-02-14
EP0696509B1 EP0696509B1 (de) 1998-09-02

Family

ID=9466160

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95401566A Expired - Lifetime EP0696509B1 (de) 1994-08-08 1995-06-29 Frankiermaschine mit einem Tintenstrahldruckkopf

Country Status (4)

Country Link
US (1) US6390577B1 (de)
EP (1) EP0696509B1 (de)
DE (1) DE69504441T2 (de)
FR (1) FR2723339B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2766757A1 (fr) * 1997-08-01 1999-02-05 Secap Dispositif pour imprimer un signe et machine a affranchir le comportant
EP1857282A1 (de) * 2006-05-19 2007-11-21 Francotyp-Postalia GmbH Verfahren zum Freispritzen der Düsen eines Tintendruckkopfes
EP1857283A1 (de) * 2006-05-19 2007-11-21 Francotyp-Postalia GmbH Verfahren zum Freispritzen der Düsen eines Tintendruckkopfes
EP2072263A3 (de) * 2007-12-17 2009-10-14 Francotyp-Postalia GmbH Vorrichtung zum Freispritzen eines Tintendruckkopfes

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1010616C2 (nl) * 1998-11-20 2000-05-23 Ptt Post Holdings Bv Werkwijze en inrichtingen voor het afdrukken van een frankeerkenmerk op een document.
WO2001062505A1 (de) * 2000-02-23 2001-08-30 Frama Ag Frankiermaschine
JP2003053941A (ja) * 2001-08-10 2003-02-26 Canon Inc インクジェット記録装置
US7289243B2 (en) * 2002-08-07 2007-10-30 Lexmark International, Inc. Apparatus and method for data compression optimized by print head architecture
US7111923B2 (en) * 2003-12-16 2006-09-26 Pitney Bowes Inc. Inkjet printing system for containment and evaporation of waste ink
JP2007015217A (ja) 2005-07-07 2007-01-25 Canon Inc インクジェット記録装置、インクジェット記録方法および予備吐出制御方法
DE102005052150B4 (de) 2005-11-02 2007-09-20 Francotyp-Postalia Gmbh Vorrichtung zur Reinigung eines Tintendruckkopfes
DE102005052151B3 (de) * 2005-11-02 2007-05-31 Francotyp-Postalia Gmbh Vorrichtung zum Freispritzen eines Tintendruckkopfes
DE102006034611B4 (de) 2006-07-21 2010-09-09 Francotyp-Postalia Gmbh Anordnung zum Auswechseln von Tintendruckmodulen
DE102007057819A1 (de) * 2007-11-30 2009-06-04 Francotyp-Postalia Gmbh Vorrichtung zum Reinhalten eines Tintendruckkopfes
DE102008033052A1 (de) 2008-07-14 2010-01-28 Francotyp-Postalia Gmbh Anordnung zum Auswechseln von Tintendruckmodulen
US11860180B2 (en) * 2020-02-10 2024-01-02 Funai Electric Co., Ltd. Removable maintenance fluid holder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0416849A2 (de) * 1989-09-04 1991-03-13 Neopost Limited Frankiermaschine
EP0451827A2 (de) * 1990-04-11 1991-10-16 Canon Kabushiki Kaisha Tintenstrahlaufzeichnungssystem
EP0589581A2 (de) * 1992-09-25 1994-03-30 Hewlett-Packard Company Verfahren und Vorrichtung zur Steuerung eines Farbstrahldruckers mittels Tropfenzählung

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US3925789A (en) * 1971-12-16 1975-12-09 Casio Computer Co Ltd Ink jet recording apparatus
DE3276400D1 (en) * 1981-11-30 1987-06-25 Alsthom Electrical shunt reactor
JPS63252748A (ja) * 1987-04-09 1988-10-19 Canon Inc 液体噴射記録装置の目詰り防止装置
US5051761A (en) * 1990-05-09 1991-09-24 Xerox Corporation Ink jet printer having a paper handling and maintenance station assembly
US5455615A (en) * 1992-06-04 1995-10-03 Tektronix, Inc. Multiple-orifice drop-on-demand ink jet print head having improved purging and jetting performance
EP0919387B1 (de) * 1992-10-30 2003-08-27 Canon Kabushiki Kaisha Verfahren und Vorrichtung zum Tintenstrahldrucken
US5617122A (en) * 1992-12-10 1997-04-01 Canon Kabushiki Kaisha Recording apparatus and method for controlling recording head driving timing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0416849A2 (de) * 1989-09-04 1991-03-13 Neopost Limited Frankiermaschine
EP0451827A2 (de) * 1990-04-11 1991-10-16 Canon Kabushiki Kaisha Tintenstrahlaufzeichnungssystem
EP0589581A2 (de) * 1992-09-25 1994-03-30 Hewlett-Packard Company Verfahren und Vorrichtung zur Steuerung eines Farbstrahldruckers mittels Tropfenzählung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2766757A1 (fr) * 1997-08-01 1999-02-05 Secap Dispositif pour imprimer un signe et machine a affranchir le comportant
EP1857282A1 (de) * 2006-05-19 2007-11-21 Francotyp-Postalia GmbH Verfahren zum Freispritzen der Düsen eines Tintendruckkopfes
EP1857283A1 (de) * 2006-05-19 2007-11-21 Francotyp-Postalia GmbH Verfahren zum Freispritzen der Düsen eines Tintendruckkopfes
EP2072263A3 (de) * 2007-12-17 2009-10-14 Francotyp-Postalia GmbH Vorrichtung zum Freispritzen eines Tintendruckkopfes
US8091979B2 (en) 2007-12-17 2012-01-10 Francotyp-Postalia Gmbh Apparatus for free-spraying an inkjet printhead

Also Published As

Publication number Publication date
US6390577B1 (en) 2002-05-21
DE69504441T2 (de) 1999-02-04
FR2723339B1 (fr) 1996-10-31
FR2723339A1 (fr) 1996-02-09
DE69504441D1 (de) 1998-10-08
EP0696509B1 (de) 1998-09-02

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