EP2942672A1 - Medienregistrierungsverfahren für Bilderzeugungsvorrichtung - Google Patents

Medienregistrierungsverfahren für Bilderzeugungsvorrichtung Download PDF

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Publication number
EP2942672A1
EP2942672A1 EP14167678.3A EP14167678A EP2942672A1 EP 2942672 A1 EP2942672 A1 EP 2942672A1 EP 14167678 A EP14167678 A EP 14167678A EP 2942672 A1 EP2942672 A1 EP 2942672A1
Authority
EP
European Patent Office
Prior art keywords
test
sheet
holes
marks
image
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Withdrawn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
EP14167678.3A
Other languages
English (en)
French (fr)
Inventor
designation of the inventor has not yet been filed The
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 EP14167678.3A priority Critical patent/EP2942672A1/de
Publication of EP2942672A1 publication Critical patent/EP2942672A1/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
    • G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/55—Self-diagnostics; Malfunction or lifetime display
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00556—Control of copy medium feeding
    • G03G2215/00569—Calibration, test runs, test prints

Definitions

  • the invention relates to a media registration method for an image forming device, comprising the steps of:
  • media registration is a process of checking, and correcting if necessary, a registration between an image forming device and substrate sheets that are to be used as print media and on which an image is to be formed with the image forming device.
  • the registration will relate to different quantities and properties. For example, it will normally have to be checked whether the position of the image forming device in a given direction Z is in registry with the position of the substrate sheets when the latter are fed to a location where an image is formed thereon with the image forming device.
  • registration may also relate to the timing at which the image forming device is operated, which time determines the position of the image on the sheet in the direction X.
  • Other examples of registration items are a skew angle of the image forming device relative to the media sheets (corresponding to a rotation in the X-Z-plane), and, in case of duplex printing, a front-to-back side registration, i.e. registration between images formed on the front side and the back side of the substrate sheets.
  • the registration may also include checks for certain distortions of the image to be formed with the image forming device and/or physical distortions of the substrate sheets, such as expansion or shrinkage in one or two directions due to changes in temperature or humidity, depending upon the material of the substrate sheets.
  • the correction of registration errors may involve settings of the sheet supply and alignment system, the timing control of the sheet supply system and/or the image forming device, a physical adjustment of the image forming device and/or a logical adjustment of the image (bitmap) to be printed.
  • a skew angle error may be corrected by rotating the image forming device or the bit map.
  • substrate sheets which show a certain isotropic or anisotropic thermal expansion, and the image forming process involves heating of the sheets to a known temperature, the thermal expansion that the sheets experience at that temperature may be compensated for by expanding the bit map accordingly.
  • a test chart is formed by printing a certain pattern of test marks onto a substrate sheet of the same type as the sheets that will later be used for printing.
  • a plurality of identical test charts are printed in order to reduce the effects of measurement noise and tolerances in the sheet handling system and the sheets themselves.
  • Both sides of the test charts will be scanned in a duplex scanner, and the positions of the test marks in the scanned images will be compared to the position of at least one physical feature of the substrate sheet (substrate mark) that may serve as a reference. Differences in the positions of the test marks on the front side and the back side relative to the reference will indicate a registration error.
  • a natural reference would be provided by the edges of the sheets.
  • using the edges of the sheet as a reference is problematic because it requires a scanner that is capable of scanning and recognizing the edges of the sheet.
  • the test marks should be printed in close proximity to the reference, i.e. adjacent to the sheet edges. Depending on the type of image forming device, this may not be possible or may have the drawback that parts of the sheet handling system outside of the contour of the sheet are stained with toner or ink.
  • the hole can be punched at a safe distance from the edge of the sheet, so that the test marks may also be formed inside the area of the sheet.
  • the invention has the advantage that the hole is formed permanently in the sheet, whereas folding always involves the risk that the folded part springs back and returns into the original position when the sheet is placed on the platen of the scanner.
  • the contour of the punched hole is exactly the same and equally well detectable when the front side and the back side of the sheet are scanned, which improves in particular the front-to-back side registration.
  • the entire stack of test charts may be punched efficiently in a single punching operation, which is not only more convenient for the user but also has the advantage that the punched hole will be formed in all sheets in exactly the same locations.
  • a plurality of holes are punched into one sheet, preferably along at least two orthogonal edges of the sheet.
  • a conventional office perforator may be used for punching the holes, which permits not only to punch two holes at a time but also has the advantage that the distance between these two holes will exactly correspond to the standardized hole distance for office perforators and is therefore known with high accuracy, which facilitates the analysis of the scanned images.
  • the punched holes and the test marks are formed in the same positions, so that the holes will severe the test marks. This assures a high contrast for the detection of the edge of the punched hole.
  • the test marks may take the form of plain black squares, with the punched hole being formed inside the square. Then, the corners of the squares permit exact position measurements, and as the corners of the square are located in the direct neighbourhood of the punched holes, the distances to be measured can be very short, which permits an improved accuracy.
  • Fig. 1 is a schematic top plan view of an image reproduction system that includes an image forming device 10 and a sheet handling system 12.
  • a step (a) the print head 14 of the reproduction system is used for printing a number of test charts 34 in a duplex mode, by forming a pattern of test marks on both sides of each substrate sheet, as will explained in detail below.
  • the substrate sheets used for the test charts should be of the same type as those that will later be used for printing.
  • Fig. 3 is a view of the front side 46 of one of the test charts 34 that have been printed in step (a), and Fig. 4 shows a view of the back side 48 of the same test chart.
  • An identical pattern of test marks 50 has been printed on both the front side 46 and the back side 48 of the test chart.
  • the test marks 50 are shaped as black squares with a size of, e.g., 20 x 20 mm and are distributed along all four edges of the test chart. More particularly, a test mark is formed in each of the four corners of the test chart, and two additional test marks are formed at each edge and arranged symmetrically between the two corners that are connected by this edge, and such that all test marks that are disposed along the same edge are aligned with one another.
  • the distance between of the outer edge of each test mark 50 and the edge of the test chart 34 may be 4 mm, for example, at all four edges of the test chart.
  • Delaying or advancing the timing at which the image is printed will shift the front side image and the back side image in opposite directions.
  • the timing will be set such that the edges 64 and 60 coincide, which means that the printed image is precisely centered between the leading edge 62 and the trailing edge 58 of the sheet, and also means that the front side image and the back side image are in perfect registration with one another.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
EP14167678.3A 2014-05-09 2014-05-09 Medienregistrierungsverfahren für Bilderzeugungsvorrichtung Withdrawn EP2942672A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14167678.3A EP2942672A1 (de) 2014-05-09 2014-05-09 Medienregistrierungsverfahren für Bilderzeugungsvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14167678.3A EP2942672A1 (de) 2014-05-09 2014-05-09 Medienregistrierungsverfahren für Bilderzeugungsvorrichtung

Publications (1)

Publication Number Publication Date
EP2942672A1 true EP2942672A1 (de) 2015-11-11

Family

ID=50693500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14167678.3A Withdrawn EP2942672A1 (de) 2014-05-09 2014-05-09 Medienregistrierungsverfahren für Bilderzeugungsvorrichtung

Country Status (1)

Country Link
EP (1) EP2942672A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017183396A1 (ja) * 2016-04-21 2017-10-26 コニカミノルタ株式会社 画像形成装置及び画像形成方法
CN111716922A (zh) * 2019-03-19 2020-09-29 富士施乐株式会社 打印机和打印系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003173109A (ja) * 2001-12-07 2003-06-20 Konica Corp 画像形成装置および画像形成調整方法
EP1385119A2 (de) * 2002-07-24 2004-01-28 Fuji Photo Film Co. Ltd. Bildverarbeitungsgerät und Bildverarbeitungsprogrammspeichermedium
EP1613052A2 (de) * 2004-06-29 2006-01-04 Konica Minolta Business Technologies, Inc. Bilderzeugungsvorrichtung und -System, Informationsverarbeitungsvorrichtung, Bildpositionskorrekturverfahren, Aufzeichnungsmedien und Programm
JP2006198804A (ja) * 2005-01-18 2006-08-03 Fuji Photo Film Co Ltd ずれ測定方法、ずれ補正装置、およびずれ補正プログラム
EP2228714A2 (de) * 2009-03-13 2010-09-15 Ricoh Company, Ltd. Bilderzeugungsvorrichtung, Bilderzeugungsverfahren und computerlesbares Speichermedium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003173109A (ja) * 2001-12-07 2003-06-20 Konica Corp 画像形成装置および画像形成調整方法
EP1385119A2 (de) * 2002-07-24 2004-01-28 Fuji Photo Film Co. Ltd. Bildverarbeitungsgerät und Bildverarbeitungsprogrammspeichermedium
EP1613052A2 (de) * 2004-06-29 2006-01-04 Konica Minolta Business Technologies, Inc. Bilderzeugungsvorrichtung und -System, Informationsverarbeitungsvorrichtung, Bildpositionskorrekturverfahren, Aufzeichnungsmedien und Programm
JP2006198804A (ja) * 2005-01-18 2006-08-03 Fuji Photo Film Co Ltd ずれ測定方法、ずれ補正装置、およびずれ補正プログラム
EP2228714A2 (de) * 2009-03-13 2010-09-15 Ricoh Company, Ltd. Bilderzeugungsvorrichtung, Bilderzeugungsverfahren und computerlesbares Speichermedium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017183396A1 (ja) * 2016-04-21 2017-10-26 コニカミノルタ株式会社 画像形成装置及び画像形成方法
JPWO2017183396A1 (ja) * 2016-04-21 2019-02-28 コニカミノルタ株式会社 画像形成装置及び画像形成方法
CN111716922A (zh) * 2019-03-19 2020-09-29 富士施乐株式会社 打印机和打印系统
CN111716922B (zh) * 2019-03-19 2023-02-28 富士胶片商业创新有限公司 打印机和打印系统

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