US20020060416A1 - Process for alignment of sheet material on a reference edge - Google Patents

Process for alignment of sheet material on a reference edge Download PDF

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Publication number
US20020060416A1
US20020060416A1 US09/858,958 US85895801A US2002060416A1 US 20020060416 A1 US20020060416 A1 US 20020060416A1 US 85895801 A US85895801 A US 85895801A US 2002060416 A1 US2002060416 A1 US 2002060416A1
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US
United States
Prior art keywords
sheet material
alignment
sheet
conveyor
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.)
Abandoned
Application number
US09/858,958
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English (en)
Inventor
Dieter Dobberstein
Joachim Haupt
Karlheinz Peter
Frank Pierel
Jurgen Sahlmann
Gerhard Sing
Rolf Spitz
Hans-Gunter Staack
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.)
NexPress Solutions LLC
Original Assignee
NexPress Solutions LLC
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 NexPress Solutions LLC filed Critical NexPress Solutions LLC
Assigned to NEXPRESS SOLUTIONS LLC reassignment NEXPRESS SOLUTIONS LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAUPT, JOACHIM, PIEREL, FRANK, SING, GERHARD, DOBBERSTEIN, DIETER, PETER, KARLHEINZ, SAHLMANN, JURGEN, SPITZ, ROLF, STAACK, HANS-GUNTER
Publication of US20020060416A1 publication Critical patent/US20020060416A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/20—Assisting by photoelectric, sonic, or pneumatic indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B65H2511/23—Coordinates, e.g. three dimensional coordinates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/10—Ensuring correct operation
    • B65H2601/12—Compensating; Taking-up
    • B65H2601/122—Play
    • B65H2601/1231—Play relative to geometry, shape of handled material

Definitions

  • the invention relates to a process for alignment of sheet material on a reference edge, before the sheet material is processed further in a machine which processes sheet material.
  • DE 44 16 564 A1 discloses a sheet alignment device.
  • This device for alignment of a sheet moving along an essentially flat transport path enables alignment of a moving sheet in a plurality of orthogonal directions, for example transversely to the transport path, in the direction of the transport path, and to eliminate skewed positions.
  • the sheet alignment device has a first roller arrangement with a first pressure roller which is supported such that it can turn around one axis which lies in a plane which extends parallel to the plane of the transport path and runs essentially at a right angle to the direction of sheet transport along the transport path.
  • a second roller arrangement has a second pressure roller which is supported such that it can turn around one axis which lies in a plane which extends parallel to the plane of the transport path and runs essentially at a right angle to the direction of sheet transport along the transport path.
  • There is a third roller arrangement which has a third pressure roller which is supported such that it can turn around one axis which lies in a plane which extends parallel to the plane of the transport path and runs essentially at a right angle to the direction of sheet transport along the transport path.
  • the third roller arrangement which can turn around one axis which lies in a plane which extends parallel to the plane of the transport path and runs essentially at a right angle to the direction of sheet transport along the transport path can be moved along its axis of rotation in the direction which runs transversely to the transport path.
  • a control means which is dynamically connected to the first and the second and the third roller arrangement and selectively controls the rotation of the first and second roller arrangement in order to align the front edge of a sheet moving in the direction of sheet transport along the transport path into the position which is at a right angle to the direction of sheet transport.
  • the control means furthermore controls the rotation and the transverse motion of the third roller arrangement in order to align the moving sheet in the direction which runs transversely to the direction of sheet transport and in the direction in which the sheet is moving along, the transport path.
  • the sheets are conveyed on the feed table in a ragged arrangement before they can be aligned on the side and pull-type lay marks which are provided in the plane of the feed table.
  • a pre-gripper which accelerates the sheet material to the machine speed and transfers it to the sheet-guiding cylinder downstream of the pre-gripper means.
  • Other alignment concepts generally use cylindrical rollers with a rubber coating which can be held on their core. If with this configuration alignment of sheet material is carried out during its feed by changing the speed between the left and right roller which grip the sheet material, the sheet material undergoes rotation around a pivot. The latter can be located either on the stationary roller or during feed of the sheet material can be located outside the roller with lower rpm or between the two rollers.
  • the object of the invention in view of the approach known from the prior art is to keep the alignment accuracy of the sheet material during its feed in the conveyor direction independent of processing tolerances of the sheet material upon which an image is to be printed.
  • line sensors can be used to advantage to determine the position of the sheet material in the conveyor plane.
  • the line sensors can advantageously be made as CCD lines or also as diode lines.
  • the sheet material can be conveyed further in the conveyor direction especially during its alignment. This ensures that the feed rate of the sheet material to a downstream processing machine is not limited by alignment and its speed.
  • the alignment accuracy becomes independent of the processing tolerances, such as for example the cutting tolerances of the sheet material, whether paper, cardboard, or even film, since the position of the sheet material is always acquired at the same location, formed from the reference point on one edge and its defined position to a reference edge of the sheet material.
  • the first reference distance is formed by the distance of the printed image from the reference edge of the sheet material.
  • the reference edge of the sheet material is the front edge of the sheet.
  • the second reference distance which determines the position of the printed image relative to the sheet material is the distance of the printed image from the reference point, for example the reference point on the side edge of the sheet material at a short distance in the conveyor direction of the sheet material horizontally from the front edge.
  • the process proposed as claimed in the invention can be carried out to improve the alignment accuracy on alignment units which can be connected upstream of the printing group of a digitally operating rotary press.
  • the print material to be processed whether film, cardboard or paper, is aligned before it is printed or optionally is processed in a digitally operating machine.
  • FIG. 1 shows the developing position deviation of a printed image relative to the surface of the print material which holds it
  • FIG. 2 shows the offset of the printed image on the sheet material, i.e. the offset characterized by a rotary offset
  • FIG. 3 shows the offset which has been printed on the bottom and top of sheet material in perfecting
  • FIG. 4 schematically shows a side view of the sheet feed area of a sheet processing machine
  • FIG. 5 shows a plan view of the alignment components, sensor technology and drives for the sheet material relative to the rotation elements which align the direction in which the sheets run,
  • FIG. 6 shows the rotation element which is made as segmented rollers above the conveyor plane of the sheet material for alignment
  • FIG. 7 shows the alignment of sheet material with the drives of the segmented rollers which carry out alignment
  • FIG. 8 shows the effect of tolerances of the printed material on the lateral alignment
  • FIG. 9 shows the definition of the reference edges and the reference point on the sheet material.
  • FIG. 1 shows sheet material, for example a printed sheet 1 , which is oriented at a right angle to its feed direction.
  • the printed sheet 1 contains on its surface a printed image 2 which is surrounded by a frame-like edge 3 .
  • the deviations of Ax and Ay which are marked within the printed surface 2 and the frame 3 , designating the positioning errors in the x and y direction 4 and 5 , can be adjusted when printing the image 2 onto the surface of the sheet material 1 .
  • the deviations labeled with reference numbers 4 and 5 are position deviations, conversely in the representation as shown in FIG. 2 angle deviations of the printed image 2 are shown with reference to the position on the printed sheet of sheet material 1 .
  • the developing angular errors are labeled with reference number 6 .
  • the printed image 2 can be printed in the indicated positions onto the surface of the printed sheet material 1 , this material being conveyed, viewed in the conveyor direction 22 , with its front edge 23 forward.
  • FIG. 3 shows in a schematic view the turning register, and the offsets which develop between the printed images 2 on the front and back of the sheet material 1 can be characterized with reference number 7 . These offsets are labeled with reference number 7 or Ax and Ay in FIG. 3.
  • the turning register plays a part especially in translucent types of paper and when printing booklets.
  • FIG. 4 shows in a schematic side view the interface of sheet alignment and feed onto a transport belt.
  • An alignment unit 8 is connected upstream of a transport belt 10 which runs around a feed roller 11 and a control roller 12 ; on the surface of the belt the sheet material 1 is held in the conveyor plane 9 .
  • the aligned sheet material 1 on the surface of the transport belt 10 travels to the conveyor plane 9 .
  • the sheet material 1 is captured by an adjustment flap or adjustment lip which can be moved in the adjustment direction 13 .
  • the adjustment lip or adjustment flap can be a plastic component which can be moved from the adjusted position 13 . 1 in the stopped position 13 .
  • the adjustment flap or adjustment lip presses the sheet material 1 onto the surface of the transport belt 10 in the aligned state of the sheet material 1 .
  • the sheet material 1 which is held on the surface of the transport belt 10 passes a charging unit 14 .
  • this charging unit 14 inside a hood-shaped cover there is an electrode 15 which provides for static charging of the sheet material 1 and thus for its adhesion to the surface of the transport belt 10 .
  • a front edge sensor 17 follows the charging unit 14 which is shown only schematically in FIG. 4.
  • This sensor consists of a radiation source 18 which is located underneath the sheet conveyor plane 9 and to which a lens arrangement 19 is series connected.
  • the radiation field 20 proceeding from the lens arrangement 19 penetrates the conveyor plane 9 and is incident on a diaphragm arrangement which is located above the conveyor plane 9 of the sheet material 1 .
  • the diaphragm arrangement precedes a receiver 21 which senses the presence of the front edge 23 of the sheet material 1 .
  • FIG. 7 shows in a plan view the alignment unit 8 with its components which are shown schematically here.
  • the alignment unit 8 is reached by the sheet material 1 which is conveyed in the conveyor direction 22 .
  • the front edge 23 of the sheet material 1 is offset with respect to the conveyor direction 22 , by which also the side edge 24 of the sheet material 1 begins to run skewed.
  • the drives 27 labeled M 1 and M 2, which drive rotation elements 25 via individual axles 32 , are accelerated to the feed rate.
  • Triggering of the drives 27 (M 1 or M 2) which is initiated via the photoelectric barrier 26 ensures that each copy of the sheet material 1 comes into contact with identical peripheral segments of the rotation elements 25 which can be made as segmented rollers in the preferred embodiment. Any developing differences in the feed motions which can be attributed to the dimensional and shape tolerances of the two rotation elements 25 thus occur in the same way for each copy of the sheet material 1 and can be easily calibrated out.
  • the sheet material 1 is transported with the feed rate over another sensor unit 30 . 1 which follows the first photoelectric barrier 26 .
  • a counter unit begins to count in motor steps. The counting process is then ended and the ascertained difference is retained when the second sensor of the sensor pair 30 . 1 operates.
  • the counter state which has been determined in this way allows determination of a correction value which is relayed as additional feed to the segmented roller drive 27 which was started last, i.e. either the drive 27 which is labeled M 1, or the drive 27 which is labeled M 2.
  • FIG. 6 shows one embodiment of the rotation elements 25 which are located above the conveyor plane 9 and which are held in the alignment unit 8 .
  • the rotation elements 25 in one preferred embodiment can be made as segmented rollers which have a peripheral surface 33 which is characterized by an interruption.
  • the segmented rollers 25 rotate in direction 34 , characterized by the illustrated arrow, and describe roughly a 3 ⁇ 4 circle with reference to their axis of rotation. Underneath the respective segmented roller 25 the roller which supports the sheet material 1 is shown. This support roller can be made either in one piece or can consist of a roller core with a coating held on it.
  • the bodies of revolution which are made as the segmented rollers 25 are shown in the neutral position in the left-hand part of FIG. 6, while in the right-hand part of FIG. 6 they grip one copy which is conveyed in the conveyor direction 22 of the sheet material 1 by its peripheral surface 33 and transport it according to the direction of rotation 34 in the conveyor direction 22 .
  • the sheet material 1 undergoes correction of its side position. After measurement of the position of the side edges 30 of the sheet material 1 by the sensors 31 , the sheet material 1 is now correctly aligned parallel to the conveyor direction 22 in which via the drive M 4 the displacement of the sheet material 1 takes place in its conveyor plane 9 before reaching the adjustment element 16 and before the sheet material 1 runs onto the surface of the transport belt 10 .
  • FIG. 8 shows the effect of tolerances, for example the cutting tolerances of the sheet material 1 to be processed, on the lateral alignment.
  • FIG. 8 shows two copies of the sheet material 1 on top of one another.
  • Each copy of the sheet material 1 has a width 42 and a lengthwise extension viewed in the conveyor direction 22 which is labeled with reference number 43 .
  • Each copy of the sheet material 1 is transported with its front edge 23 forward in the conveyor direction 22 , the front edge 23 adjoining the side edge 24 which runs essentially parallel.
  • the offset 39 which in the copies of the sheet material 1 to one another [sic] and which follows from FIG. 8 causes activation of the lateral alignment elements at different times as a result of the different operating points 40 and 41 which arise.
  • the two operating points 40 and 41 for the copies of the sheet material 1 which are shown on top of one another cause a different lateral alignment accuracy depending on the side register error 39 which occurs each time and which can fluctuate greatly depending on the print material and is the cause of an alignment result which is subject to defects.
  • the cutting tolerances or the side register errors 39 of the sheet material 1 i.e. the right angle between the front edge 23 of the sheet and the adjoining side edges 24 , are included in the alignment result.
  • the different operating points 40 and 41 which develop as a result of tolerances on sheet material 1 for the alignment elements 25 can be eliminated as shown in FIG. 9 by the position of the sheet material 1 in the conveyor plane 9 always being measured at the same position 35 with respect to a reference edge 23 .
  • line sensors which are provided with the corresponding resolution allow controlled correction of the position of the sheet material 1 viewed in the conveyor direction 22 after recording the sheet position with respect to its reference edge 23 .
  • the position 37 of the printed images which are located on the sheet material 1 is defined with respect to the reference edge 23 by the distance 36 while it is defined with respect to the measurement point 35 on the side edge via the distance 38 .
  • the register accuracy is no longer limited by the cutting tolerances of the sheet material, so that register inaccuracies in booklet printing can no longer occur for images of two different sheets extending over two pages.

Landscapes

  • Registering Or Overturning Sheets (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Making Paper Articles (AREA)
US09/858,958 2000-05-17 2001-05-15 Process for alignment of sheet material on a reference edge Abandoned US20020060416A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10023938.2 2000-05-17
DE10023938A DE10023938A1 (de) 2000-05-17 2000-05-17 Verfahren und Ausrichtung bogenförmigen Materials an einer Referenzkante

Publications (1)

Publication Number Publication Date
US20020060416A1 true US20020060416A1 (en) 2002-05-23

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US09/858,958 Abandoned US20020060416A1 (en) 2000-05-17 2001-05-15 Process for alignment of sheet material on a reference edge

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Country Link
US (1) US20020060416A1 (ja)
EP (1) EP1170236B1 (ja)
JP (1) JP4960552B2 (ja)
AT (1) ATE323050T1 (ja)
DE (2) DE10023938A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080181694A1 (en) * 2007-01-30 2008-07-31 Fuji Xerox Co., Ltd. Image forming apparatus
US20090057994A1 (en) * 2007-08-30 2009-03-05 Kabushiki Kaisha Toshiba Sheet carrying device and sheet carrying method
US20100013149A1 (en) * 2008-07-17 2010-01-21 Kabushiki Kaisha Toshiba Sheet conveying apparatus and sheet conveying method
CN103770477A (zh) * 2014-01-17 2014-05-07 北京京东方显示技术有限公司 打码机和打码方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007040131A1 (de) * 2006-09-20 2008-03-27 Eastman Kodak Company Verfahren und Vorrichtung zum Ausrichten von bogenförmigen Substraten
JP5355021B2 (ja) * 2008-10-06 2013-11-27 キヤノン株式会社 画像形成装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2046602B2 (de) * 1970-09-22 1973-09-06 Koenig & Bauer AG, ,700 Würzburg Bogenzufuehrung bei druckmaschinen
JP2893540B2 (ja) * 1989-09-06 1999-05-24 富士ゼロックス株式会社 画像形成装置
DE4201886C1 (ja) * 1992-01-24 1993-07-08 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
JPH0640019A (ja) * 1992-07-27 1994-02-15 Minoguruupu:Kk 各種機械へのシート材供給機におけるシート材位置決め装置
US5322273A (en) * 1993-05-18 1994-06-21 Eastman Kodak Company Sheet registration mechanism
DE19524891A1 (de) * 1995-07-08 1997-01-09 Heidelberger Druckmasch Ag Vorrichtung zum seitlichen Ausrichten von Bögen im Anleger einer Bogenrotationsdruckmaschine
NL1003631C2 (nl) * 1996-07-18 1998-01-21 Oce Tech Bv Afdrukinrichting met rechtlegstation voor het aan weerszijden bedrukken van rechtgelegde ontvangstvellen.
JPH10153891A (ja) * 1996-11-25 1998-06-09 Fuji Xerox Co Ltd 画像形成装置
DE19814141C2 (de) * 1998-03-30 2003-08-14 Ltg Holding Gmbh Verfahren und Vorrichtung zum positionsgenauen Zuführen von flächenförmigen Gütern zu einem Bearbeitungsprozeß
JP3879305B2 (ja) * 1999-02-17 2007-02-14 富士ゼロックス株式会社 画像形成装置および用紙束生成装置並びに画像形成装置を用いた用紙束の生成方法

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080181694A1 (en) * 2007-01-30 2008-07-31 Fuji Xerox Co., Ltd. Image forming apparatus
US8050617B2 (en) * 2007-01-30 2011-11-01 Fuji Xerox Co., Ltd. Image forming apparatus
US20090057994A1 (en) * 2007-08-30 2009-03-05 Kabushiki Kaisha Toshiba Sheet carrying device and sheet carrying method
US7775518B2 (en) * 2007-08-30 2010-08-17 Kabushiki Kaisha Toshiba Sheet carrying device and sheet carrying method
US20100262277A1 (en) * 2007-08-30 2010-10-14 Kabushiki Kaisha Toshiba Sheet carrying device and sheet carrying method
US20100013149A1 (en) * 2008-07-17 2010-01-21 Kabushiki Kaisha Toshiba Sheet conveying apparatus and sheet conveying method
US8181957B2 (en) * 2008-07-17 2012-05-22 Kabushiki Kaisha Toshiba Sheet conveying apparatus and sheet conveying method
CN103770477A (zh) * 2014-01-17 2014-05-07 北京京东方显示技术有限公司 打码机和打码方法

Also Published As

Publication number Publication date
EP1170236A2 (de) 2002-01-09
DE50109477D1 (de) 2006-05-24
DE10023938A1 (de) 2001-11-22
ATE323050T1 (de) 2006-04-15
EP1170236A3 (de) 2003-01-29
EP1170236B1 (de) 2006-04-12
JP4960552B2 (ja) 2012-06-27
JP2002029648A (ja) 2002-01-29

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DOBBERSTEIN, DIETER;HAUPT, JOACHIM;PETER, KARLHEINZ;AND OTHERS;REEL/FRAME:012229/0088;SIGNING DATES FROM 20010605 TO 20010615

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