EP0910509A1 - Mecanisme d'impression - Google Patents

Mecanisme d'impression

Info

Publication number
EP0910509A1
EP0910509A1 EP98902925A EP98902925A EP0910509A1 EP 0910509 A1 EP0910509 A1 EP 0910509A1 EP 98902925 A EP98902925 A EP 98902925A EP 98902925 A EP98902925 A EP 98902925A EP 0910509 A1 EP0910509 A1 EP 0910509A1
Authority
EP
European Patent Office
Prior art keywords
printing unit
counter
unit according
pressure roller
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
EP98902925A
Other languages
German (de)
English (en)
Other versions
EP0910509B1 (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

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
    • 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 comprises a printing unit according to the preamble of claim 1.
  • Printing units have been known for a long time which produce an imprint 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.
  • thermal transfer printing technology With advancing printing technology, especially the emergence of thermal transfer printing technology, the demand, which i.a. to transfer advantages gained with this so-called thermal printing process also to the printing of stamps.
  • a printing unit with a printing head touching the surface of the object to be printed for example a thermal printing head
  • a thermal printing head which can either be installed as a retrofit element in existing devices with, for example, a tampon printing unit or in the redesign of one with a printer provided device can be used.
  • parts of the printing unit for example the printing unit housing, can be integrated into the device receiving this printing unit (for example a franking machine).
  • this is also part of this task contain the condition that the new printing unit, like the previously known printing units, can print objects of different geometrical dimensions, that is to say, for example, different letter thicknesses, using known printing technology.
  • Part of the invention is also a franking machine which contains a printing unit designed according to the invention.
  • the invention provides the advantage that the print head can be placed on objects of different thickness (range from 0 to e.g. several centimeters or more) with little technical effort and in an extremely reliable mechanical manner, 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.
  • FIG. 1 shows a side view of a printing unit
  • FIG. 3 is a timing diagram of the main shaft movement
  • 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, i.e. the print head leaves space for inserting an envelope.
  • the lever 2 After a main shaft rotation angle of 120 degrees, the lever 2 is deflected by the spring 13 to such an extent 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 lever 7 is 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 to a stop 10 acting as a counter pressure limiter.
  • the further levers 8 are in each case 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 upward over the cam plate 11, the counterparts roller-carrying lever 7 only move upwards until the counter-pressure roller 6 with the envelope lying on it comes to rest against the stationary roller.
  • the resulting overstroke of the lever 8 with respect to the lever 7 causes the spring 9 to be pretensioned essentially independent of the envelope thickness constant differential force pressed onto the ribbon or the envelope.
  • the pressure of the print head can be selected via the choice of 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.
  • Envelopes filled unevenly can be printed easily and reproducibly thanks to constant contact pressure and the printhead that can move freely around the swivel axis.
  • FIG. 2 shows the principle of the envelope feed caused by the counter-pressure roller 6.
  • a motor mounted stationary in the housing of the printing unit drives a series of gearwheels 17-21, which are mounted on the one roller lever 7, via a worm gear 15, 16.
  • the last gear 21 sits on the same shaft as the counter pressure roller 6 and drives it regardless of the position. Since the roller 6, in turn, presses against the envelope at the bottom under the spring differential prestress described, it is inevitably transported by the rotating roller 6.
  • the stationary roller 12 lying on the other side of the envelope also rotates.
  • the current position of the envelope is detected and reported via rotary angle signaling systems, for example in the form of slotted disks, by means of commercially available position detectors 21 and light barriers of an electronic circuit (not described in more detail here, since it can be implemented in many different ways).
  • This electronics can then trigger printing of the print head 1 at a selectable distance from the coupon.
  • FIG. 3 shows the printing process on the single envelope in the form of a timing diagram.
  • the first 120 degrees of the main shaft rotation 5 are responsible for inserting and clamping the envelope between the counter-pressure roller 6 and the stationary roller 12 and for lowering the print head 1.
  • the main shaft rotation 5 is now stopped and the transport motor 14 is stopped. starts.
  • the envelope is transported under the print head and printed until a light barrier (not shown) starts the main shaft 5 again.
  • the print head and counter-pressure roller 6 are then moved away from the envelope surface.
  • the envelope transport continues.
  • a pair of ejection rollers takes care of the remaining transport and ejects the envelope from the printing unit area.
  • the main shaft rotates 240 degrees the ejection roller pair is also opened and the transport drive is switched off.
  • the invention is not limited to the embodiment described and shown in the figures. Rather, it encompasses all printing units in which the teaching of the claims is realized, i.e. which primarily enable pressure to be applied to the printhead independently of the object thickness and with constant force. It is immaterial whether individual elements shown are replaced by means that work or act in the same or a similar way.

Landscapes

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

Abstract

L'invention concerne un mécanisme d'impression, dont la tête d'impression (1) est plaquée avec une force d'appui essentiellement constante sur une surface d'un objet à imprimer. A cet effet, la tête d'impression (1) et le rouleau presseur (6) sont montés sur des leviers pivotants (2, 7, 8) reliés par des ressorts (9, 13). Ce mécanisme d'impression peut être utilisé en particulier dans des machines à timbrer.
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 true EP0910509A1 (fr) 1999-04-28
EP0910509B1 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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9840220A1 *

Also Published As

Publication number Publication date
EP0910509B1 (fr) 2002-08-07
US6059468A (en) 2000-05-09
CA2254856C (fr) 2007-11-06
DE59805081D1 (de) 2002-09-12
WO1998040220A1 (fr) 1998-09-17
CA2254856A1 (fr) 1998-09-17

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