EP1674278A1 - Imprimante avec un chariot oscillante pour une tête d'impression - Google Patents

Imprimante avec un chariot oscillante pour une tête d'impression Download PDF

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Publication number
EP1674278A1
EP1674278A1 EP05112125A EP05112125A EP1674278A1 EP 1674278 A1 EP1674278 A1 EP 1674278A1 EP 05112125 A EP05112125 A EP 05112125A EP 05112125 A EP05112125 A EP 05112125A EP 1674278 A1 EP1674278 A1 EP 1674278A1
Authority
EP
European Patent Office
Prior art keywords
ruler
guide rail
platen
frame
bearing
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
EP05112125A
Other languages
German (de)
English (en)
Other versions
EP1674278B1 (fr
Inventor
Frank J.H. Nottelman
Barry B. Goeree
Henk-Jan Zwiers
Bas W.J.J.A. Van Dorp
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.)
Canon Production Printing Netherlands BV
Original Assignee
Oce Technologies BV
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 Oce Technologies BV filed Critical Oce Technologies BV
Priority to EP20050112125 priority Critical patent/EP1674278B1/fr
Publication of EP1674278A1 publication Critical patent/EP1674278A1/fr
Application granted granted Critical
Publication of EP1674278B1 publication Critical patent/EP1674278B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/20—Positive-feed character-spacing mechanisms
    • B41J19/202—Drive control means for carriage movement
    • B41J19/205—Position or speed detectors therefor
    • B41J19/207—Encoding along a bar

Definitions

  • the invention relates to a printer comprising: a frame, a bearing assembly mounted to said frame, a platen rotatably supported in the bearing assembly for advancing a sheet of a recording medium, a guide rail mounted to the frame and extending in parallel with an axial direction of the platen, a ruler extending in parallel with the guide rail, a carriage driven to reciprocate along the guide rail and carrying a printhead, and a detector arranged to detect the position of the carriage relative to the ruler.
  • a typical example of a printer of this type is an ink jet printer having a printhead or printheads adapted to expel droplets of liquid ink onto the recording medium that is advanced over the platen.
  • the timings at which the nozzles of the printhead are energised must be accurately synchronised with the movement of the carriage.
  • the carriage is equipped with the detector for reading markings on the ruler. In order to achieve a high print quality, it is prerequisite that the position of the ruler relative to the recording medium in the direction of the reciprocating movement of the carriage is stable over the whole print process.
  • the ruler is fixed at the guide rail, and the frame has a very stiff construction so that it will not be distorted by forces of inertia that are created by the acceleration and deceleration of the carriage.
  • this object is achieved by a printer of the type indicated above, wherein, in said axial direction, the ruler is rigidly fixed at a location of the bearing assembly independently of the guide rail.
  • the position of the ruler is directly coupled to the position of the bearing assembly which itself defines the axial position of the platen and hence the position of the sheet of the recording medium.
  • the frame becomes distorted, this will induce a lateral displacement of both, the platen and the guide rail, but the displacement of the guide rail will be different from that of the platen.
  • the lateral displacement of the ruler will be the same as that of the platen, so that a stable relation between the position of the ruler and the recording medium is assured.
  • the stiffness requirements for the frame may be less strict, which leads to a cost and weight reduction, and/or the print quality is improved or, for a given print quality, the carriage may be accelerated and decelerated more rapidly, so that a higher throughput can be achieved.
  • the bearing assembly typically is formed by two bearings that are fixed at respective frame members at opposite ends of the platen.
  • both ends of the ruler are rigidly held at a respective one of the two bearings.
  • only one end of the ruler is held at one of the bearings, and the other end of the ruler is elastically connected to the frame, so that the ruler is tensioned between the two frame members. Then, the elastic suspension of the ruler permits the ruler to follow the lateral displacements of the one bearing to which it is connected.
  • the rigid connection between the end of the ruler and the bearing may preferably be achieved by means of a holding plate that is oriented in parallel with the axial direction of the platen, so that it has a high stiffness in this axial direction.
  • the holding plate may be mounted to a bracket that is itself attached to the bearing or to a frame member directly at the mounting position of the bearing.
  • the mounting plate may form an extended arm which passes through a slot formed in the guide rail.
  • the printer shown in figure 1 comprises a frame 10 which is composed of a lower frame 12 formed by two uprights 14 and two cross-bars 16, and an upper frame that is formed by two plate-like frame members 18 projecting upwardly from the cross-bars 16.
  • a bearing assembly is formed by two bearings 20 which rotatably support a platen 22 between the two frame members 18.
  • a sheet support plate 24 is horizontally supported on the two frame members 18 and serves to support a sheet of a recording medium (not shown in Fig. 1) which is advanced in X-direction (normal to the plane of the drawing in Fig. 1) by means of the platen 22.
  • a worm-type drive mechanism 26 for the platen 22 is arranged near one of the bearings 20 (on the left side in Fig. 1).
  • a guide rail 28 rests on the top ends of the frame members 18 and extends in parallel with the axial direction Y of the platen 22.
  • a carriage 30 is guided on the guide rail 28 and is driven to move back and forth along the guide rail by means of a belt drive mechanism 32.
  • the carriage 30 has a portion extending over the sheet support plate 24, and a printhead 34 is mounted on the bottom side of this carriage portion so as to face the sheet that is advanced over the sheet support plate 24.
  • the printhead 34 may for example be a hot melt ink jet printhead.
  • a ruler 36 extends above and in parallel with the guide rail 28 and has markings that can be read by a detector 38 mounted on the carriage 30.
  • an electronic control system of the printer determines the timings at which the print units or nozzles of the printhead 34 are energised while the carriage 30 moves across the recording medium.
  • a bracket 40 is rigidly mounted on each of the bearings 20, more precisely, on the stationary part of the bearing, and a holding plate 42 oriented in the Y-Z-plane is ridigly secured to the bracket 40.
  • Each holding plate 42 forms an arm 44 which extends obliquely upwardly and outwardly through a slot formed in the guide rail 28.
  • the ruler 36 is, with its opposite ends, rigidly held between the top ends of the arms 44.
  • the bracket 40 On the left side in Fig. 1, the bracket 40 also accommodates the drive mechanism 26, and the holding plate 42 straddles a worm gear 46 of the drive mechanism.
  • the guide rail 28 is formed by a profile member which supports two cylindrical rods 48 on which the carriage 30 is supported and guided with roller bearings.
  • the slot for the arm 44 is indicated as 50.
  • the inclined position of the arms 44, as shown in Fig. 1, has the advantage that the ruler 36 can be held under a certain tension and at the same time permits the carriage 30 to travel over the full width of the sheet support plate.
  • the spring 54 will hold the ruler 36 under a certain tension, but nevertheless, as in the first embodiment, the position of the ruler in Y-direction will be determined by the position of the bearing 20 and will thus be locked to the Y-position of the platen 22 and the sheet 56 advanced thereby.
  • FIG. 5 illustrates the conventional case that the ruler 36 is rigidly supported at the guide rail 28. Then, the distortion of the frame 10 would lead to a displacement of the ruler markings and hence of the actual print position Pa in Y-direction relative to the intended target print position Pt, and the print quality would be deteriorated.
  • the present invention successfully solves this problem.

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
EP20050112125 2004-12-22 2005-12-14 Imprimante avec un chariot oscillante pour une tête d'impression Not-in-force EP1674278B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20050112125 EP1674278B1 (fr) 2004-12-22 2005-12-14 Imprimante avec un chariot oscillante pour une tête d'impression

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04106831 2004-12-22
EP20050112125 EP1674278B1 (fr) 2004-12-22 2005-12-14 Imprimante avec un chariot oscillante pour une tête d'impression

Publications (2)

Publication Number Publication Date
EP1674278A1 true EP1674278A1 (fr) 2006-06-28
EP1674278B1 EP1674278B1 (fr) 2009-07-15

Family

ID=36406375

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050112125 Not-in-force EP1674278B1 (fr) 2004-12-22 2005-12-14 Imprimante avec un chariot oscillante pour une tête d'impression

Country Status (1)

Country Link
EP (1) EP1674278B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011064295A1 (fr) 2009-11-30 2011-06-03 Oce-Technologies B.V. Procédé de détermination de la vitesse d'un objet dans un système d'impression

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0810546A2 (fr) * 1996-05-30 1997-12-03 Hewlett-Packard Company Ruban de codage et procédé utilisant ledit ruban de codage
JPH10253318A (ja) * 1997-03-11 1998-09-25 Brother Ind Ltd リニアエンコーダのクリーニング機構
US6010206A (en) * 1996-05-15 2000-01-04 Oce-Technologies B.V. Method and system for detecting the position of a carriage
EP1077139A2 (fr) * 1999-08-11 2001-02-21 Canon Kabushiki Kaisha Appareil d'impression d'images
US6264303B1 (en) * 1996-01-10 2001-07-24 Canon Kabushiki Kaisha Optical linear encoder and recording apparatus using the same
EP1393921A2 (fr) * 2002-08-30 2004-03-03 Canon Kabushiki Kaisha Moyens de levage pour tête et bande de code de position dans un appareil d'enregistrement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6264303B1 (en) * 1996-01-10 2001-07-24 Canon Kabushiki Kaisha Optical linear encoder and recording apparatus using the same
US6010206A (en) * 1996-05-15 2000-01-04 Oce-Technologies B.V. Method and system for detecting the position of a carriage
EP0810546A2 (fr) * 1996-05-30 1997-12-03 Hewlett-Packard Company Ruban de codage et procédé utilisant ledit ruban de codage
JPH10253318A (ja) * 1997-03-11 1998-09-25 Brother Ind Ltd リニアエンコーダのクリーニング機構
EP1077139A2 (fr) * 1999-08-11 2001-02-21 Canon Kabushiki Kaisha Appareil d'impression d'images
EP1393921A2 (fr) * 2002-08-30 2004-03-03 Canon Kabushiki Kaisha Moyens de levage pour tête et bande de code de position dans un appareil d'enregistrement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 14 31 December 1998 (1998-12-31) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011064295A1 (fr) 2009-11-30 2011-06-03 Oce-Technologies B.V. Procédé de détermination de la vitesse d'un objet dans un système d'impression

Also Published As

Publication number Publication date
EP1674278B1 (fr) 2009-07-15

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