EP1661726B1 - Dispositif avec une surface d'impression et une plaque d'alimentation pour manipuler des feuilles - Google Patents

Dispositif avec une surface d'impression et une plaque d'alimentation pour manipuler des feuilles Download PDF

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Publication number
EP1661726B1
EP1661726B1 EP20050111022 EP05111022A EP1661726B1 EP 1661726 B1 EP1661726 B1 EP 1661726B1 EP 20050111022 EP20050111022 EP 20050111022 EP 05111022 A EP05111022 A EP 05111022A EP 1661726 B1 EP1661726 B1 EP 1661726B1
Authority
EP
European Patent Office
Prior art keywords
sheet
notches
print surface
handling device
edge
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.)
Not-in-force
Application number
EP20050111022
Other languages
German (de)
English (en)
Other versions
EP1661726A1 (fr
Inventor
Lodewijk T. Holtman
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 EP20050111022 priority Critical patent/EP1661726B1/fr
Publication of EP1661726A1 publication Critical patent/EP1661726A1/fr
Application granted granted Critical
Publication of EP1661726B1 publication Critical patent/EP1661726B1/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
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
    • B41J13/14—Aprons or guides for the printing section
    • 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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0085—Using suction for maintaining printing material flat
    • 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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/02—Platens
    • B41J11/06—Flat page-size platens or smaller flat platens having a greater size than line-size platens

Definitions

  • cockling phenomenon is related to the fact that paper and similar materials tend to absorb humidity from ambient air and to expand and contract in accordance with their humidity content. Typically, the expansion and contraction is not isotropic and is particularly pronounced in a direction in which the fibers of the paper are predominantly oriented. When there exists a gradient in humidity within the paper, then the more humid portion of the paper will expand more than the drier portion, which inevitably leads to the production of cockles or wrinkles.
  • the paper is intermittently advanced over a flat sheet support plate, while a carriage moves back and forth across the paper, and ink jet printheads mounted on the carriage are energized to eject droplets of ink onto the paper so as to form a printed image. Since the carriage moves with relatively high velocity, the ink droplets ejected onto the paper undergo a certain aberration and are deposited on the paper in a somewhat dislocated position. The amount of dislocation is proportional to the flight distance of the ink droplets.
  • the printheads When the ink jet print printheads are positioned very close to the surface of the paper to minimize the dislocation, the printheads might even touch large cockles or bumps of the paper, so that the quality of the printed image is also deteriorated.
  • EP 1 123 809 A2 discloses an apparatus for keeping receiving material flat against a plate during the application of an ink image to the receiving material.
  • the plate has parallel ribs between which shallow channels are formed. Suction holes are arranged at the ribs. A negative pressure is also formed in the channels, and the receiving material is to some extent pulled into the channels.
  • a distance between neighboring notches varies in a regular pattern.
  • the notches are grouped into pairs, each pair being arranged between the lateral positions of the transport rollers. Additionally or alternatively, the size and/or shape of the notches may vary in a regular pattern.
  • the transport rollers 16 intersect the feed plate 18 and form a transport nip with the platen 10, so that the sheet 12, which is supplied from a reel (not shown) via a guide plate 20, is transported along a sheet transport slot that is formed by the feed plate 18 and the print surface 15 of the sheet support plate 14. Then, the sheet 12 is paid out through a gap formed between an edge 21 of the feed plate 18 and the surface of the sheet support plate 14. At the edge 21, the feed plate 18 forms an angle of, for example, less than 10° with the print surface 15.
  • a carriage 22 which includes a number of hot melt ink jet printheads (not shown) is mounted above the sheet support plate 14 so as to reciprocate in the direction of arrows B across the sheet 12.
  • a number of pixel lines of an image are printed in each pass of the carriage 22.
  • the sheet 12 is advanced by a step of appropriate length in the direction indicated by the arrow A, so that the next pixel lines can be printed.
  • the sheet 12 On its way from the guide plate 20, past the platen 10 and past the feed plate 18 to the print surface 15, the sheet 12 will inevitably be exposed to ambient air and, as a result, will absorb humidity, especially when the relative humidity RH of the ambient air is high.
  • the sheet 12 when the sheet 12 comes into contact with the print surface 15, the sheet might be exposed to a different temperature or a different relative humidity of the ambient air at the sheet support plate 14. Thereby, new cockles may develop, or those cockles which have already been present in the sheet may expand further.
  • the feed plate 18 comprises notches 40.
  • the notches 40 are arranged in a regular pattern. However, as is shown in Fig. 3 , a smaller distance and a larger distance between neighboring notches alternate. Thereby, the notches 40 are grouped into pairs. Regarding the lateral positions of the slots 19 that accommodate the sheet transport rollers 16 ( Fig. 1 ), the slots 19 are arranged in coincidence with the larger distance between the notches 40. Thus, each pair of notches 40 is arranged between the lateral positions of neighboring transport rollers 16.

Landscapes

  • Handling Of Sheets (AREA)
  • Ink Jet (AREA)

Claims (7)

  1. Dispositif de manipulation de feuille pour une imprimante ou une copieuse, comprenant une surface d'impression (15) pour supporter une première surface d'une feuille (12), une plaque d'alimentation (18) ayant un bord (21) qui est adjacent à la surface d'impression (15), et un mécanisme d'alimentation (10, 16) pour alimenter la feuille (12) à la surface d'impression (15) à travers un espace entre le bord (21) de la plaque d'alimentation (18) et la surface d'impression (15), le bord (21) de la plaque d'alimentation (18) comprenant des encoches (40) agencées de sorte que, au bord (21), les encoches (40) fournissent un espace pour la feuille (12) à une deuxième surface de la feuille (12), caractérisé en ce que ladite surface d'impression (15) comprend des trous d'aspiration (24) pour aspirer la feuille (12) contre la surface d'impression (15), et en ce que les encoches (40), en interrompant une ligne droite du bord (21), sont agencées de sorte que la feuille (12) soit guidée principalement vers ces parties du bord (21) qui sont entre les encoches (40), en contrôlant ainsi les positions auxquelles des crispages (48) ou des faux-plis peuvent se développer dans la feuille (12).
  2. Dispositif de manipulation de feuille selon la revendication 1, où les encoches (40) sont agencées d'une manière régulière.
  3. Dispositif de manipulation de feuille selon l'une quelconque des revendications précédentes, où le mécanisme d'alimentation (10, 16) comprend des rouleaux de transport de feuille (16) qui sont répartis sur la largeur de la plaque d'alimentation (18).
  4. Dispositif de manipulation de feuille selon la revendication 3, où les rouleaux de transport de feuille (16) et les encoches (40) sont positionnés de sorte que, à des positions latérales des rouleaux de transport de feuille (16), il existe une distance plus grande entre des encoches voisines (40) par rapport à une distance moyenne.
  5. Dispositif de manipulation de feuille selon l'une quelconque des revendications précédentes, où la surface d'impression (15) est formée par une plaque de support de feuille (14) et les trous d'aspiration (24) passent à travers la plaque de support de feuille (14).
  6. Imprimante comprenant le dispositif de manipulation de feuille selon l'une quelconque des revendications précédentes.
  7. Imprimante selon la revendication 6, l'imprimante étant une imprimante à jet d'encre thermofusible.
EP20050111022 2004-11-25 2005-11-21 Dispositif avec une surface d'impression et une plaque d'alimentation pour manipuler des feuilles Not-in-force EP1661726B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20050111022 EP1661726B1 (fr) 2004-11-25 2005-11-21 Dispositif avec une surface d'impression et une plaque d'alimentation pour manipuler des feuilles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04106085 2004-11-25
EP20050111022 EP1661726B1 (fr) 2004-11-25 2005-11-21 Dispositif avec une surface d'impression et une plaque d'alimentation pour manipuler des feuilles

Publications (2)

Publication Number Publication Date
EP1661726A1 EP1661726A1 (fr) 2006-05-31
EP1661726B1 true EP1661726B1 (fr) 2010-09-01

Family

ID=36204557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050111022 Not-in-force EP1661726B1 (fr) 2004-11-25 2005-11-21 Dispositif avec une surface d'impression et une plaque d'alimentation pour manipuler des feuilles

Country Status (1)

Country Link
EP (1) EP1661726B1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9010495U1 (de) * 1990-07-12 1991-11-14 Siemens Nixdorf Informationssysteme AG, 4790 Paderborn Führungsvorrichtung für die Papierführung in einem Druck- oder Schreibgerät
JPH09512506A (ja) * 1995-02-28 1997-12-16 ヒューレット・パッカード・カンパニー インクジェット・プリンタにおける媒体操作
NL1014351C2 (nl) * 2000-02-10 2001-08-14 Ocu Technologies B V Inrichting voor het positioneren van ontvangstmateriaal tijdens het aanbrengen van een inktbeeld daarop.

Also Published As

Publication number Publication date
EP1661726A1 (fr) 2006-05-31

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