EP1602499A2 - Épreuve-couleur avec moyens de contrôle du gondolement - Google Patents

Épreuve-couleur avec moyens de contrôle du gondolement Download PDF

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Publication number
EP1602499A2
EP1602499A2 EP05101377A EP05101377A EP1602499A2 EP 1602499 A2 EP1602499 A2 EP 1602499A2 EP 05101377 A EP05101377 A EP 05101377A EP 05101377 A EP05101377 A EP 05101377A EP 1602499 A2 EP1602499 A2 EP 1602499A2
Authority
EP
European Patent Office
Prior art keywords
curl
medium
printing apparatus
receiving medium
feeding
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.)
Withdrawn
Application number
EP05101377A
Other languages
German (de)
English (en)
Other versions
EP1602499A3 (fr
Inventor
Erik AGFA-GEVAERT Dutoit
Stefaan Deman
Jozef Feys
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.)
Mutoh Europe NV
Agfa NV
Original Assignee
Agfa Gevaert NV
Mutoh Europe NV
Agfa Gevaert 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 Agfa Gevaert NV, Mutoh Europe NV, Agfa Gevaert AG filed Critical Agfa Gevaert NV
Priority to EP05101377A priority Critical patent/EP1602499A3/fr
Publication of EP1602499A2 publication Critical patent/EP1602499A2/fr
Publication of EP1602499A3 publication Critical patent/EP1602499A3/fr
Withdrawn legal-status Critical Current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
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/16—Means for tensioning or winding the web
    • 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
    • B41J11/0005—Curl smoothing, i.e. smoothing down corrugated printing material, e.g. by pressing means acting on wrinkled printing material
    • 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
    • B41J11/001—Handling wide copy materials
    • 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
    • B41J11/0025—Handling copy materials differing in width
    • B41J11/003—Paper-size detection, i.e. automatic detection of the length and/or width of copy material
    • 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
    • B41J11/007—Conveyor belts or like feeding devices
    • 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
    • B41J11/0095—Detecting means for copy material, e.g. for detecting or sensing presence of copy material or its leading or trailing end
    • 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
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/60—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing on both faces of the printing material

Definitions

  • the present invention relates to a solution for feeding large size media having residual curl in a large size ink jet printer.
  • a double sided color proofing apparatus uses rolled web material as printing stock and is further provided with a web feed device, a tumbler unit for turning the receiving medium and a alignment sensing and correction system.
  • the web feeding device is provided with a decurling roller to reduce curl of the medium when the paper is fed from the paper roll.
  • a decurling roller to reduce curl of the medium when the paper is fed from the paper roll.
  • residual curl can still pose severe problems and can lead to a misfeed of the cut sheet and paper jam during functioning of the printer.
  • Another problem is that curl is depending upon relative humidity of the paper stock.
  • Residual curl is curl remaining in the material fed to the printer, even after possible de-curling procedures which have the aim to remove or reduce curl in the printing material.
  • the means for counteracting residual curl will be described as the functioning of a printing apparatus is explained. They do not reduce the curl properties of the material but allow the apparatus to handle curled media.
  • a printing apparatus for printing double sided images.
  • the apparatus comprises several main parts:
  • the printing apparatus is usually supported by a lightweight pedestal 4 which can be provided with wheels 5 making it easy to move the printing apparatus.
  • a receiving basket 6 On the pedestal 4 is mounted a receiving basket 6 to store finished prints.
  • the media supply means comprises :
  • the print unit 1 itself is provided with printer drive rollers 11 and printer pinch rollers 12 which can be lowered onto the receiving medium 10 and which are provided for holding and transporting the receiving medium 10 at a constant speed during printing of the images.
  • the rollers are provided along the complete width of the apparatus and the drive rollers 11 are driven by a single motor to ensure a constant and even transport of the receiving medium 10 without skew or other irregularities.
  • a possible type of roller for the drive rollers 11 is a metal grid roller while the pinch roller(s) 12 usually have an elastomeric surface
  • the middle section of the bar carrying the pinch rollers has relative less force for pinching the paper to the drive rollers.
  • the bar carrying the inch rollers is made heavier using metal rollers or loads to enhance the pinching action of the pinch rollers in the middle and thus also enhancing the correctness of feeding of the paper.
  • the receiver medium 10 is advanced. Due to the torque caused by the friction brake mechanism 8 acting upon the medium roll 7 a tension is created in the receiving material 10 and curl which remained in the material due to the storage in rolled up state is substantially removed by guiding the material in a relative sharp bend over a guide plate 9.
  • the anti-curl guidance 13 comprises an array of rigid , metal fingers 14 holding the leading edge of the paper web down.
  • a transport belt system 15 enables the anti-curl guidance to translate between a position close to the drive rollers of the print unit and the tumbler unit situated on the right side. The translation orientation is indicated by the double arrow in Fig 2.
  • the receiving medium 10 is also guided over a suction plate 16 further holding down the receiving medium 10 at the position of the print head also avoiding problems which can be caused by residual curl in the receiving medium 10.
  • suction plate 16 suction holes are provided while one or more ventilators provide a vacuum in a compartment under the suction plate 16.
  • the receiving medium 10 guided over the suction plate 16 is held to the suction plate 16 by the suction acting upon the receiving medium 10 through the suction holes in the plate. This ensure a constant distance from the print head to the receiver 10.
  • the residual curl in web fed paper can be quantified by the height h of the edge of the paper sheet above e.g. a table when the sheet is put flat on a table. This can be as much as e.g. 5cm above the table level, even higher values have been reported. With such a residual curl the paper web would certainly miss the transport rollers of the tumbler unit and a misfeed would be the result.
  • the aim of the anti-curl guidance 13 is to hold the paper edge down so it can be fed to the transport rollers of the tumbler unit downstream the printhead. With the printhead put outside the paper path the anti-curl guidance is translated to the drive rollers 11 of the printing unit by the transport system 15. As the medium 10 passes the drive and transport rollers 11, 12 it is fed further forward. A sensor in the front plate detects the media 10 and indicates when the anti-curl guidance 13 can translate back from the main unit towards the tumbler unit at substantially the same speed as the feeding of the paper. During the feeding of the paper the anti-curl guidance means holds down the edge of the sheet 10 between the metal fingers 14 and the suction plate 16. The anticurl 13 guidance guides the edge of the sheet until the end position at the tumbler unit is reached. Then the sheet is further fed forward as is indicated in Fig 5.
  • the leading edge and the size of the receiving material 10 is detected using a sensor.
  • a sensor Preferably this is done by one or more optical sensors using measurement of reflection or transmission.
  • a single reflection sensor, mounted on the shuttle 18 holding the print head, can be used for detecting the edges of the receiving web 10, but separate systems using one or multiple sensors can be employed. Out of these measurements the size of the receiving medium 10 can be detected and even misalignment can be indicated to the operator.
  • the front-side image is printed by the print head.
  • this is done by a colour inkjet print head mounted on a shuttle.
  • the print head shuttles across the receiving medium 10 the image of the front side is recorded on the receiver 10.
  • the medium 10 is moved forward by the printer drive rollers 11 in a controlled manner. In this way the image is printed gradually.
  • Image data is supplied to the print unit 1 from an image source in a synchronised manner.
  • the leading end of the receiving web 10 gradually passes under the anti-curl guidance 13 and enters the tumbler unit 3 located on the front side of the print unit 1.
  • transport belts 17 are provided to pull the paper further forward.
  • the speed of the transport belt is however a bit larger than the paper feed speed. This provides stretching of the paper so that curl is also counteracted in the center of the sheet and the distance to the printhead is kept at an ideal value.
  • Fig. 5 the nip 20 between the front drive rollers 18 and corresponding front pinch rollers 19 is initially left wide open in order to freely let the leading end of the receiving medium 10 pass through the tumbler unit 3.
  • This feature of the apparatus also counteracts problems when the medium has a certain residual curl. It ensures that the transport speed of the print unit 1 is not influenced and the printed image is undisturbed.
  • the receiving web 10 When the front-side image is completely printed the receiving web 10 is fed to the required position to enable it to be cut of at the correct place.
  • the printer driver rollers 11 stop and hold the receiver web 10.
  • the pinch rollers 19 in the tumbler unit now are lowered and pinch the receiving sheet 10 between the tumbler driver rollers 18 and pinch rollers 19 as shown in fig 5. It has to be remarked that the transport and pinch rollers of the tumbler unit are preferably located outside of the image area in order not to damage the printed image
  • the paper After printing of the image the paper is held by the main transport rollers 11, suction plate and the transport rollers 18 of the tumbler unit.
  • a cutting mechanism now cuts the receiving web 10 at the appropriate location separating the printed image from the non-printed part of the receiving web 10 thus creating a receiver sheet carrying a printed image on the front-side.
  • the cutting can be done using a knife blade mechanism mounted on the shuttle of the print head 16 which can be actuated when necessary. After the cutting the front drive/pinch rollers 18, 19 now have control over the receiver sheet, only holding the sheet at the side edges.
  • the rear pinch roller 21 contacts the web. This can be done by a lowering mechanism, but as indicated in Fig. 5 an embodiment is possible wherein a partial roller contacts the web 10 simply by rotation of the partial pinch roller 21.
  • the dimensions of the rear pinch roller 21 may be so that it spans the whole width of the printer or it may be divided into two or more pinch rollers 21 dispersed over the printer width.
  • the web 10 has to be contacted at at least two points relatively far apart to ensure that the web 10 is prevented from rotating to a slant position.
  • the printer pinch rollers 12 are lifted so that the control of the web 10 is given to the rear pinch roller 21 which prevents the medium 10 from dropping out of the print unit 1.
  • the printer pinch rollers 12 are lifted so that the control of the web 10 is given to the rear pinch roller 21 which prevents the medium 10 from dropping out of the print unit 1.
  • the printer pinch rollers 12 are lifted so that the control of the web 10 is given to the rear pinch roller 21 which prevents the medium 10 from dropping out of the print unit 1.
  • the printer pinch roller 21 by rotating the rear pinch roller 21 backwards the leading end of the web 10 is retracted behind the position of the print head and the position of the printer pinch rollers 12. Retraction is stopped when the entrance slit 22 of the re-feeding storage chamber 23 is cleared. The leading end of the web 10 is kept stationary until the printing of the next front-side image.
  • the number of rotations of the rear pinch roller 21 may vary. A small diameter of the roller 21 may require several rotations to retract the leading end of the web 10. In case of a partial roller, as
  • the retraction and holding of the receiving web 10 by the rear pinch roller 21 during further printing of the backside image allows also to automatically load the receiving web 10 to the printing unit.
  • the receiving sheet 10 cut from the web, carrying the front side image, is fed forward into and trough the tumbler unit 3 by rotation of the front-drive rollers 18, coupled to a drive disc, until the rear end of the receiving sheet 10 has cleared the printer unit 1.
  • the front end drive rollers 18 are stopped and tumbling action is started.
  • the receiving medium is turned upside down by the tumbler unit so that recording at the back side of the medium can be done.
  • the tumbler sequence essentially is a combination of
  • the reloading sequence is started from the situation of Fig. 7.
  • the sheet 10 is fed backwards into the printing unit 1 into a re-feeding chamber 23.
  • the re-feeding chamber 23 is located below the path from which the media is fed from the roll in the first printing sequence.
  • the opening is enlarged. This is accomplished by a rotatable retractor pivot 24 lifting the retractor pivot plate 25. During feeding of the media from the roll the pivot plate 25 is in a lowered position so that the media can easily pass over it.
  • This feature of the apparatus counteracts problems which are normally expected to arise when using media having considerable residual curl.
  • Alignment of the re-fed sheet can be done using the edges of the media. After some experience it was detected that the first printed image is not always parallel to the edge of the media. Preferably some marks are printed on the left and right side of the first image which are measured with the position sensors on the verso side the length of the image. After some calculation we can scale/adjust the second image on the verso side.
  • the second printing cycle can begin. After printing the verso side of the sheet, the sheet 10 is fed through out of the printing apparatus into the receiving basket mounted on the pedestal 4 to store finished prints.
  • the leading edge of the roll media 10 which is held by the rear pinch roller 21 of the retraction system can be fed forward again and a new recording cycle can start using the anti-curl guidance to guide the sheet.
  • a very important parameter is the relative humidity in which the roll media 7 is stored in the apparatus.
  • a relative high humidity is preferred as paper then exhibits low residual curl. Diverse conditions can cause the roll to become very dry leading to problems
  • a first possibility to avoid the drying of the roll is by enclosing the roll inside the apparatus to avoid air flow. This can be done using a special cover design restricting possible air flow.
  • a possible embodiment is shown in 9A and B. At least the past storing the paper roll should be enclosed.
  • the cover comprises shutters which can be easily opened and closed to facilitate the changing of the roll of paper.
  • An even better embodiment is one wherein the relative humidity is measured and problems can be reported to the operator of the printing apparatus. In very difficult conditions an system for regulating the relative humidity can be use to keep the roll at the correct relative humidity for printing.

Landscapes

  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
EP05101377A 2004-04-30 2005-02-23 Épreuve-couleur avec moyens de contrôle du gondolement Withdrawn EP1602499A3 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05101377A EP1602499A3 (fr) 2004-04-30 2005-02-23 Épreuve-couleur avec moyens de contrôle du gondolement

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04101862 2004-04-30
EP04101862 2004-04-30
EP05101377A EP1602499A3 (fr) 2004-04-30 2005-02-23 Épreuve-couleur avec moyens de contrôle du gondolement

Publications (2)

Publication Number Publication Date
EP1602499A2 true EP1602499A2 (fr) 2005-12-07
EP1602499A3 EP1602499A3 (fr) 2005-12-21

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Family Applications (1)

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EP05101377A Withdrawn EP1602499A3 (fr) 2004-04-30 2005-02-23 Épreuve-couleur avec moyens de contrôle du gondolement

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2939840A1 (fr) * 2009-07-31 2015-11-04 Memjet Technology Limited Système d'impression avec rouleau d'entraînement et ensemble courroie sous vide
CN105966090A (zh) * 2016-05-10 2016-09-28 江南大学 一种升降打印平板与印花方法
CN113600444A (zh) * 2021-08-04 2021-11-05 惠州五和实业有限公司 一种密胺餐具花纸用刷浆烘干一体化装置及其使用方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5668581A (en) * 1993-10-27 1997-09-16 Mita Industrial Co., Ltd. Ink jet printing apparatus
US5883643A (en) * 1995-03-09 1999-03-16 Licentia Patent-Verwaltungs-Gmbh Device and method for printing markings on flat consignments
US6210055B1 (en) * 1999-06-30 2001-04-03 Hewlett-Packard Company Method and apparatus for cockle reduction in print media
US6637328B1 (en) * 2000-06-16 2003-10-28 Ecrm, Inc. Imaging system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5668581A (en) * 1993-10-27 1997-09-16 Mita Industrial Co., Ltd. Ink jet printing apparatus
US5883643A (en) * 1995-03-09 1999-03-16 Licentia Patent-Verwaltungs-Gmbh Device and method for printing markings on flat consignments
US6210055B1 (en) * 1999-06-30 2001-04-03 Hewlett-Packard Company Method and apparatus for cockle reduction in print media
US6637328B1 (en) * 2000-06-16 2003-10-28 Ecrm, Inc. Imaging system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2939840A1 (fr) * 2009-07-31 2015-11-04 Memjet Technology Limited Système d'impression avec rouleau d'entraînement et ensemble courroie sous vide
CN105966090A (zh) * 2016-05-10 2016-09-28 江南大学 一种升降打印平板与印花方法
CN113600444A (zh) * 2021-08-04 2021-11-05 惠州五和实业有限公司 一种密胺餐具花纸用刷浆烘干一体化装置及其使用方法

Also Published As

Publication number Publication date
EP1602499A3 (fr) 2005-12-21

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