EP1787819A1 - Imprimante avec chariot mobile - Google Patents

Imprimante avec chariot mobile Download PDF

Info

Publication number
EP1787819A1
EP1787819A1 EP06123519A EP06123519A EP1787819A1 EP 1787819 A1 EP1787819 A1 EP 1787819A1 EP 06123519 A EP06123519 A EP 06123519A EP 06123519 A EP06123519 A EP 06123519A EP 1787819 A1 EP1787819 A1 EP 1787819A1
Authority
EP
European Patent Office
Prior art keywords
carriage
guide rail
printhead
print surface
stop
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
EP06123519A
Other languages
German (de)
English (en)
Other versions
EP1787819B1 (fr
Inventor
Cornelis H.J. Slaats
Barry B. Goeree
Henricus W.C. Douven
Jeroen A.A. Van Assen
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 EP20060123519 priority Critical patent/EP1787819B1/fr
Publication of EP1787819A1 publication Critical patent/EP1787819A1/fr
Application granted granted Critical
Publication of EP1787819B1 publication Critical patent/EP1787819B1/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
    • B41J19/02—Character- or line-spacing mechanisms with retarding devices, e.g. brakes
    • 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
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
    • 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
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
    • B41J25/3082—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms with print gap adjustment means on the print head carriage, e.g. for rotation around a guide bar or using a rotatable eccentric bearing

Definitions

  • the invention relates to a printer comprising a carriage, a guide rail and a print surface, the carriage being movable along the guide rail and carrying a printhead that faces the print surface and is movable in a direction normal to the plane of the print surface.
  • a sheet of paper or any other recording medium is advanced in a subscanning direction over the print surface.
  • the printhead is arranged on the carriage in such a position that it faces the print surface, and a nozzle face of the printhead forms a narrow gap with the paper on the print surface.
  • a drive mechanism causes the carriage to move back and forth in a main scanning direction along the guide rail, the position of the carriage in the main scanning direction is detected by means of a ruler or the like, and, on the basis of the detection result, the nozzles of the printhead are fired at appropriate timings, so that ink dots are printed in the intended positions on the paper.
  • the position of the printhead on the carriage must be adjusted with high precision.
  • the printer according to the invention comprises a stop mechanism responsive to a movement of the printhead in said direction normal to the plane of the print surface and adapted to stop the movement of the carriage.
  • the printhead is rigidly mounted to the carriage, and the upward movement of the printhead relative to the print surface is made possible by a tilting movement of the carriage, including the printhead, about a fulcrum on the guide rail. Then, the stop mechanism will also have the effect to protect the carriage against running out of the guidance.
  • the guide rail and the carriage may be designed so as to provide an end stop which limits the tilting movement of the carriage and hence the lift movement of the printhead to a relatively small amount.
  • the co-operating end stops on the guide rail and on the carriage are configured as brake surfaces that will be brought into engagement with one another when the paper jam causes the lift movement of the printhead.
  • the stop mechanism is embodied as a brake mechanism, and the force that is created by the paper and tends to lift the printhead away from the print surface is directly used as a brake actuating force for the brake mechanism.
  • one of the end stops preferably the one on the carriage, is configured as a switch or contact sensor which issues an electronic signal to stop the drive mechanism as soon as the printhead has been lifted to such an extent that the sensor or switch is actuated.
  • the printhead may be mounted to be movable relative to the carriage in the direction normal to the plane of the print surface, and the brake and the sensor or switch, respectively, may be actuated by the relative movement between the printhead and the carriage.
  • the printer shown in Fig. 1 comprises a frame 10 having a lower support structure 12 formed by two uprights 14, two cross-bars 16, and two mounting plates 18 rising up from the cross-bars 16.
  • a plate-like function block 20 is attached to each of the mounting plates 18 and extends in parallel therewith.
  • Two bearings 22 rotatably support a feed roller 24 between the two mounting plates 18.
  • a sheet support plate 26 is horizontally supported on the two function blocks 20 and forms a print surface 26' which serves to support a sheet S of a recording medium which is advanced in an X-direction (normal to the plane of the drawing in Fig. 1) by means of the feed roller 24.
  • a drive mechanism for the feed roller 24 has not been shown here for simplicity.
  • a guide rail 28 rests on the top ends of the function blocks 20 and extends in parallel with the axial direction Y of the feed roller 24.
  • a carriage 30 is guided on the guide rail 28 and is driven to move back and forth along the guide rail by means a drive mechanism formed by a belt 32, for example.
  • the carriage 30 has a portion extending over the sheet support plate 26, and a printhead 34 is mounted on the bottom side of this carriage portion so as to face the sheet S that is advanced over the print surface 26'.
  • the printhead 34 may for example be a hot melt ink jet printhead.
  • a detection and control system which may have a conventional design and has not been shown here, detects the Y-position of the carriage 30 and determines the timings at which the print units or nozzles of the printhead 34 are energised while the carriage moves across the recording medium.
  • the guide rail 28 is formed by a profile member which supports two cylindrical rods 36, 38 on which the carriage 30 is supported and guided with roller bearings.
  • the guide rail 28 rests on V-shaped top surfaces of the function blocks 20 and is thereby accurately positioned in X-direction, i.e. the direction, in which the recording medium advances, and in the vertical Z-direction normal to the print surface 26'.
  • the printhead 34 When the printhead 34 is subject to an upwardly directed force, it may be lifted away from the print surface 26' in the direction Z, because the carriage 30, to which the printhead is rigidly connected, is capable of tilting about the cylindrical rod 36. This tilting movement, however, is limited by an end stop 40 that projects from the carriage 30 and forms a little clearance with the bottom side of a flange 42 of the guide rail 28.
  • the belt 32 is trained around a pulley 44 that is driven by a motor 46.
  • the motor 46 is speed-controlled, so that the carriage 30 is moved along the guide rail 28 with uniform velocity.
  • Print signals are transmitted to nozzle actuators of the printhead 34 through a flexible cable 48.
  • the feed roller 26 and the sheet support plate 26 are capable of handling sheets S or webs of paper of varying width, corresponding to sheet sizes from A4 - A0, for example.
  • a sheet S of relatively small size is advanced over the print surface 26', and, as has been shown exaggeratedly in the drawing, the edges of the sheet S are curled upwardly, so that they will be hit by the printhead 34 when the carriage 30 moves along the guide rail.
  • the sheet S will crumple in the gap between the nozzle face of the printhead and the print surface, so that a severe paper jam may occur, which involves the risk that the printhead 34 or parts of the mounting structure thereof are damaged or distorted.
  • the end stop 40 and the flange 42 are configured to provide a stop mechanism for the carriage 30, as has been shown in Fig. 3.
  • This figure illustrates a situation where the sheet S has jammed between the print surface 26' and the nozzle face on the bottom side of the printhead 34, so that the carriage 30 has been tilted about the central axis of the cylindrical rod 36.
  • the end stop 40 on the carriage 30 and the flange 42 of the guide rail 28 are formed with brake surfaces 50 and 52, respectively, which provide a relatively high friction coefficient and are so inclined that they are brought into mating engagement with one another by the tilting movement of the carriage 30.
  • the motor 46 may continue to rotate, but a slip coupling 54 between the output shaft of the motor and the pulley 44 prevents the belt 32 from being moved further and from overcoming the braking force of the brake surfaces 50, 52.
  • the brake surfaces 50, 52 form a simple and yet efficient and sensitive stop mechanism which will bring the carriage 30 to a stop before the paper jam becomes worse and causes damage to the printhead 34.
  • the motor 26 can be provided with an overload switch that stops the motor when the resistance caused by the brake surfaces becomes larger.
  • Fig. 4 illustrates a modified embodiment, wherein the brake mechanism is formed by a sensor 56 or a switch that is mounted on the end stop 40 in such a position that is faces the bottom side of the flange 42 and delivers an electronic signal as soon as the sensor 56 contacts the flange 42.
  • This signal is transmitted to the drive circuit for the motor 46 via the cable 48 and causes the motor 46 to stop.
  • the motor 46 may be a step-motor or, more generally, a motor that is capable of creating a high braking force, so that the carriage 30 will be stopped instantaneously as soon as a paper jam occurs.

Landscapes

  • Ink Jet (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Common Mechanisms (AREA)
EP20060123519 2005-11-18 2006-11-06 Imprimante avec chariot mobile Not-in-force EP1787819B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20060123519 EP1787819B1 (fr) 2005-11-18 2006-11-06 Imprimante avec chariot mobile

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05110956 2005-11-18
EP20060123519 EP1787819B1 (fr) 2005-11-18 2006-11-06 Imprimante avec chariot mobile

Publications (2)

Publication Number Publication Date
EP1787819A1 true EP1787819A1 (fr) 2007-05-23
EP1787819B1 EP1787819B1 (fr) 2008-08-27

Family

ID=37983768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060123519 Not-in-force EP1787819B1 (fr) 2005-11-18 2006-11-06 Imprimante avec chariot mobile

Country Status (1)

Country Link
EP (1) EP1787819B1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3482511A (en) * 1966-07-20 1969-12-09 Kienzle Apparate Gmbh Printing arrangement with tabulated printing cylinder
JPS57146676A (en) * 1981-03-06 1982-09-10 Ricoh Co Ltd Braking device for carriage in printer
EP0623474A2 (fr) * 1993-05-03 1994-11-09 Hewlett-Packard Company Méthode pour déterminer et ajuster la qualité d'impression dans les imprimantes thermiques à jet d'encre
EP0713781A1 (fr) * 1994-11-25 1996-05-29 Hewlett-Packard Company Méthode pour ajuster l'espace entre la tête d'impression et les supports d'impression

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3482511A (en) * 1966-07-20 1969-12-09 Kienzle Apparate Gmbh Printing arrangement with tabulated printing cylinder
JPS57146676A (en) * 1981-03-06 1982-09-10 Ricoh Co Ltd Braking device for carriage in printer
EP0623474A2 (fr) * 1993-05-03 1994-11-09 Hewlett-Packard Company Méthode pour déterminer et ajuster la qualité d'impression dans les imprimantes thermiques à jet d'encre
EP0713781A1 (fr) * 1994-11-25 1996-05-29 Hewlett-Packard Company Méthode pour ajuster l'espace entre la tête d'impression et les supports d'impression

Also Published As

Publication number Publication date
EP1787819B1 (fr) 2008-08-27

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