EP0910509B1 - Mecanisme d'impression - Google Patents

Mecanisme d'impression Download PDF

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Publication number
EP0910509B1
EP0910509B1 EP98902925A EP98902925A EP0910509B1 EP 0910509 B1 EP0910509 B1 EP 0910509B1 EP 98902925 A EP98902925 A EP 98902925A EP 98902925 A EP98902925 A EP 98902925A EP 0910509 B1 EP0910509 B1 EP 0910509B1
Authority
EP
European Patent Office
Prior art keywords
lever
printing unit
unit according
roller
print head
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
EP98902925A
Other languages
German (de)
English (en)
Other versions
EP0910509A1 (fr
Inventor
Werner Haug
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.)
Frama AG
Original Assignee
Frama AG
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 Frama AG filed Critical Frama AG
Publication of EP0910509A1 publication Critical patent/EP0910509A1/fr
Application granted granted Critical
Publication of EP0910509B1 publication Critical patent/EP0910509B1/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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/312—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print pressure adjustment mechanisms, e.g. pressure-on-the paper mechanisms

Definitions

  • the present invention relates to a thermal printing unit according to the preamble of patent claim 1.
  • Printing units have been known for a long time which produce a print on an object by means of a stamp. Such printing units were used in particular to generate postage stamps on envelopes, cards and the like shipping items. With the advancement of printing technology, in particular the emergence of thermal transfer printing technology, the need to transfer the advantages gained with this so-called thermal printing process to the printing of stamps also increased.
  • JP-A-05293950 keeps the contact pressure of a print head constant to the printed product with different printed product thickness.
  • a flat printed product by a from a fixedly arranged second roll and a promotional gap formed on a lever mounted on a lever Printhead fed against which the print product is held by a counter pressure roller becomes.
  • the counter pressure roller On the one on the axis of the stationary second Roller mounted lever is the counter pressure roller, whose distance to the printhead changes according to the thickness of the printed product passing through the gap.
  • the Counter pressure roller is countered by a tension spring attached to the third lever held the printhead.
  • WO-A-87/03251 relates to a thermal printer which has a frame on which a printing roller of a printing station is mounted. Furthermore, the pressure roller is Transport of a paper and a print transfer web with a drive device educated. On the frame is a parallel to the axis of rotation of the pressure roller and relative arranged to the printing station back and forth carriage on which a print head is attached. The printhead is pretensioned towards the printing roller by means of a pretensioning device.
  • a printing unit with the surface of the printhead contacting the printing object e.g. a thermal print head
  • a printing unit with the surface of the printhead contacting the printing object e.g. a thermal print head
  • a device provided with a printer can be used.
  • parts of the printing unit e.g. the printing unit housing in which this printing unit receiving device (e.g. a franking machine) can be integrated.
  • this task also includes the condition that the new printing unit the same or better than the previously known printing units with known printing technology Objects of different geometrical dimensions, e.g. different Letter thickness, can print.
  • the object is achieved according to the characterizing part of patent claim 1.
  • the invention provides the advantage that, with little technical effort and in an extremely reliable mechanical manner, the print head can be placed on objects of different thicknesses (range from 0 to, for example, several centimeters or more) and the print image can be transferred with the help of the transfer belt with the same contact pressure.
  • the design effort can be reduced and / or the degree of automation of the printing unit can be increased.
  • the thermal print head 1 (commercially available element) is mounted on a lever 2 which can be pivoted about the pivot point 3.
  • This lever is positively controlled via a cam 4 arranged on the driven main shaft 5.
  • lever 2 In the waiting position (normal position), lever 2 is raised, ie the print head leaves room for inserting an envelope.
  • the lever 2 After a main shaft rotation angle of about 120 degrees, the lever 2 is pivoted so far via the spring 13 that the print head 1 rests on the envelope with the ink ribbon drawn through it. At this point, the lower side of the envelope lies on the counter-pressure roller 6.
  • the counter-pressure roller 6 is rotatably mounted on and between two levers 7 which can be pivoted about the same pivot point as the lever 2.
  • This roller lever 7 is each coupled via a spring 9 to a further lever 8, which in turn can be rotated about the same pivot point 3.
  • the spring 9 can only pull the lever 8 back up to a stop 10 acting as a counter pressure limiter on the roller lever 7.
  • the levers 8 are in turn positively controlled via a second cam plate 11, which is also arranged on the main shaft 5. In this way, the levers 8 are pressed upwards over the cam plate 11, the levers 7 carrying the counter-roller only moving upwards until the counter-pressure roller 6 comes to rest on the stationary roller with the envelope lying on it.
  • the printhead 1 Since the spring force exerted by the spring 9 must be greater than the spring force exerted by the spring 13 on the roller lever 7, the printhead 1 has a essentially independent of the envelope thickness constant differential force pressed on the ribbon or the envelope.
  • the pressure of the print head can be selected by choosing springs 9 and 13. This principle and the free oscillation of the counterpressure roller around axis 3 enable the envelope surface to be printed to be guided in parallel, even with different local envelope thickness dimensions. In other words, unevenly filled envelopes can be printed easily and reproducibly thanks to constant contact pressure and the print head, which can move freely around the swivel axis.
  • the choice of spring strength primarily depends on the weight and the required contact pressure of the commercial print head used in each case. In addition, the spring characteristics the path dependence of the force can be optimized.
  • vibration dampers parallel to the springs can be used.
  • FIG. 2 shows the principle of the envelope feed caused by the counter-pressure roller 6.
  • a motor 14 mounted stationary in the housing of the printing unit drives over a worm gear 15, 16 a series of gears 17 to 21 on one Roller lever 7 are stored.
  • the last gear 21 sits on the same shaft as the counter pressure roller 6 and drives it regardless of position. Since the role 6 in turn under the described spring differential preload on the bottom of the envelope this is inevitably transported by the rotating roller 6. This turns but also the stationary roller 12 lying on the other side of the envelope.
  • Via rotation angle signaling systems e.g. in the form of slotted disks, is by means of commercially available position detector 21 and light barriers of an electronic circuit (not described in more detail here, since it can be implemented in many different ways) current position of the envelope recorded and reported. This electronics can then trigger printing of the print head 1 at a selectable distance from the coupons.
  • Figure 3 shows in the form of a timing diagram the printing process on the single envelope.
  • the first 120 degrees of the main shaft rotation 5 are for insertion and pinching of the envelope between counter-pressure roller 6 and stationary roller 12 and for that Lowering the print head 1 responsible.
  • the main shaft rotation 5 is now stopped and the transport motor 14 started. This will put the envelope under the printhead transported past and printed until a light barrier (not shown) the Main shaft 5 starts again.
  • the print head and counter-pressure roller 6 are then from moved away from the envelope surface.
  • the envelope transport continues.
  • a pair of ejection rollers takes over the remaining transport, and ejects the envelope from the printing unit area.
  • the pair of ejection rollers is also opened and the transport drive is switched off.

Landscapes

  • Devices For Checking Fares Or Tickets At Control Points (AREA)
  • Electronic Switches (AREA)
  • Common Mechanisms (AREA)

Claims (8)

  1. Groupe d'impression par transfert thermique comprenant une tête d'impression agissant par l'intermédiaire d'une bande d'encrage entraínée sur les objets plats, tels que des enveloppes, des cartes ou analogues, qu'un cylindre porte-clichés entraíné fait avancer, caractérisé en ce que le cylindre porte-clichés (6) monté à l'extrémité libre d'un levier de cylindre (7) pouvant pivoter autour d'un axe (3) peut être approché de façon contrôlée d'un cylindre stationnaire (12) pouvant tourner librement qui est monté en aval de la tête d'impression (1) par rapport au sens d'avancement des objets.
  2. Groupe d'impression selon la revendication 1, caractérisé en ce que le levier de cylindre (7) est relié à une came (11) fixée sur un arbre principal (5) de manière à pouvoir être déplacé par celle-ci.
  3. Groupe d'impression selon la revendication 2, caractérisé en ce qu'un levier (8) relié au levier de cylindre (7) au moyen d'un ressort précontraint (9) est monté sur l'axe de pivotement (3) du levier de cylindre (7).
  4. Groupe d'impression selon la revendication 3, caractérisé en ce que le levier (8) peut être bloqué d'un côté par le ressort (9) au niveau d'une butée (10) fixée sur le levier de cylindre (7).
  5. Groupe d'impression selon la revendication 4, caractérisé en ce que la came (11) est reliée par l'intermédiaire du levier (8) au levier de cylindre (7) de manière à le commander.
  6. Groupe d'impression selon la revendication 5, caractérisé en ce que le cylindre porte-clichés (6) est relié à un moteur d'entraínement par le biais d'un train d'engrenages monté sur le levier de cylindre (7).
  7. Groupe d'impression selon la revendication 6, caractérisé en ce que la tête d'impression (1) est fixée à l'extrémité libre d'un autre levier (2) qui est monté sur l'axe de pivotement (3) des leviers (7, 8) et qui peut être mis hors service par une seconde came (4) fixée sur l'arbre principal (5).
  8. Machine à affranchir pour imprimer des valeurs d'affranchissement postal sur des objets plats tels que des enveloppes, des cartes postales ou analogues, à l'aide d'un groupe d'impression selon les revendications 1 à 7.
EP98902925A 1997-03-11 1998-02-24 Mecanisme d'impression Expired - Lifetime EP0910509B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH566/97 1997-03-11
CH56697 1997-03-11
CH56697 1997-03-11
PCT/CH1998/000074 WO1998040220A1 (fr) 1997-03-11 1998-02-24 Mecanisme d'impression

Publications (2)

Publication Number Publication Date
EP0910509A1 EP0910509A1 (fr) 1999-04-28
EP0910509B1 true EP0910509B1 (fr) 2002-08-07

Family

ID=4189979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98902925A Expired - Lifetime EP0910509B1 (fr) 1997-03-11 1998-02-24 Mecanisme d'impression

Country Status (5)

Country Link
US (1) US6059468A (fr)
EP (1) EP0910509B1 (fr)
CA (1) CA2254856C (fr)
DE (1) DE59805081D1 (fr)
WO (1) WO1998040220A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100385051B1 (ko) * 2001-01-20 2003-05-23 삼성전자주식회사 잉크 젯 프린터의 헤드갭 조정장치
US6616354B2 (en) * 2001-10-30 2003-09-09 Hewlett-Packard Development Company, Lp. Method and apparatus for adjusting printhead to print-media travel path spacing in a printer
US6736557B2 (en) * 2002-09-05 2004-05-18 Lexmark International, Inc. Printhead gap adjustment mechanism for an imaging apparatus
US7204654B2 (en) * 2003-07-02 2007-04-17 Lexmark International, Inc. Perforation forming mechanism for use in an imaging apparatus
US7429013B2 (en) 2004-02-17 2008-09-30 Paxar Americas, Inc. Unwind for printer
US7125182B2 (en) * 2004-02-17 2006-10-24 Paxar Americas, Inc. Printer
EP2522520B1 (fr) * 2011-05-09 2013-11-06 Wincor Nixdorf International GmbH Imprimante de matrice de point pour carnets de banque, reçus et similaires
AU2012335952B2 (en) 2011-11-07 2015-04-23 Zebra Technologies Corporation Media processing device with enhanced media and ribbon loading and unloading features
US9744784B1 (en) 2016-02-05 2017-08-29 Zih Corp. Printhead carriers and adapters

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5925666B2 (ja) * 1976-04-26 1984-06-20 株式会社サト−研究所 ハンドラベラ−等における定圧機構
JPH0632958B2 (ja) * 1985-02-28 1994-05-02 株式会社ピーエフユー ヘツドギヤツプ自動調整機構
US4710040A (en) * 1985-12-02 1987-12-01 Ncr Corporation Printer having constant pressure between print head and platen
JPS63178056A (ja) * 1987-01-20 1988-07-22 Matsushita Electric Ind Co Ltd 印字装置
JPH026169A (ja) * 1988-06-24 1990-01-10 Nec Data Terminal Ltd 用紙厚検出機構
JP2651460B2 (ja) * 1988-09-30 1997-09-10 セイコー電子工業株式会社 印字ヘッド駆動装置
JPH0426741U (fr) * 1990-06-25 1992-03-03
JPH0473175A (ja) * 1990-07-13 1992-03-09 Tokyo Electric Co Ltd プリンタ
JPH07115459B2 (ja) * 1992-04-17 1995-12-13 三谷電子工業株式会社 長尺印刷物に対する印刷装置
DE4332602C2 (de) * 1993-09-24 1998-12-24 Meto International Gmbh Druckmaschine mit Druckwalze und Druckkopf

Also Published As

Publication number Publication date
US6059468A (en) 2000-05-09
CA2254856C (fr) 2007-11-06
EP0910509A1 (fr) 1999-04-28
DE59805081D1 (de) 2002-09-12
CA2254856A1 (fr) 1998-09-17
WO1998040220A1 (fr) 1998-09-17

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