US20020017755A1 - Method for alignment of sheet-like materials - Google Patents

Method for alignment of sheet-like materials Download PDF

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Publication number
US20020017755A1
US20020017755A1 US09/855,479 US85547901A US2002017755A1 US 20020017755 A1 US20020017755 A1 US 20020017755A1 US 85547901 A US85547901 A US 85547901A US 2002017755 A1 US2002017755 A1 US 2002017755A1
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US
United States
Prior art keywords
sheet
alignment
rotated around
rotation
aligned
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
US09/855,479
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English (en)
Inventor
Dieter Dobberstein
Joachim Haupt
Karlheinz Peter
Frank Pierel
Jurgen Sahlmann
Gerhard Sing
Rolf Spilz
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, SAHLMANN, JURGEN, SPITZ, ROLF, DOBBERSTEIN, DRETER, PETER, KARLHEINZ, PIEREL, FRANK, SING, GERHARD, STAACK, HANS-GUNTER
Publication of US20020017755A1 publication Critical patent/US20020017755A1/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
    • B65H9/002—Registering, e.g. orientating, articles; Devices therefor changing orientation of sheet by only controlling movement of the forwarding means, i.e. without the use of stop or register wall
    • 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
    • B65H2553/00—Sensing or detecting means
    • B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
    • B65H2553/41—Photoelectric detectors

Definitions

  • the invention relates to a method for improving the alignment precision of a sheet-like material, which, prior to further processing, is accurately aligned on a conveyor surface with respect to its rotational position, i.e., its slanting position viewed in the feed direction.
  • DE 44 16 564 A1 relates to a sheet alignment device.
  • This device for aligning a sheet moving along an essentially flat conveyor belt enables the alignment of a moving sheet in a multitude of orthogonal directions, for example, transversing the conveyor belt, in the direction of the conveyor belt, and to eliminate skewed positions of the sheet-like material in relation to its conveyor belt.
  • the device has a first roller arrangement, having a first pressure roller, that is positioned in such a way that it can revolve around an axis that lies on a surface running parallel to the surface of the conveyor belt and progresses essentially at a right angle to the direction of the sheet conveyor along the conveyor belt.
  • a second roller arrangement has a second pressure roller that is positioned in such a way that it can revolve around an axis that lies on a surface running parallel to the surface of the conveyor belt and progresses essentially at a right angle to the direction of the sheet conveyor along the conveyor belt. Furthermore, a third roller arrangement is provided, having a third pressure roller, that is positioned in such a way that it can revolve around an axis that lies on a surface running parallel to the surface of the conveyor belt and progresses essentially at a right angle to the direction of the sheet conveyor along the conveyor belt.
  • the third roller arrangement which can revolve around an axis that lies on a surface running parallel to the surface of the conveyor belt and progresses essentially at a right angle to the direction of the sheet conveyor along the conveyor belt, can be moved along its rotational axis in a direction transversing the conveyor belt.
  • a control device is provided that is connected to the first, or respectively second, or third roller arrangement and that alternatively controls the rotation of the first and second roller arrangement, in order to align the leading edge of a sheet rotating in the direction of the sheet conveyor along the conveyor belt in a position that is at a right angle to the direction of the sheet conveyor.
  • the control device furthermore controls the rotation and transverse movement of the third roller arrangement, in order to align the moving sheet in the direction transversing the direction of the sheet conveyor, as well as in the direction in which the sheet moves along the conveyor belt.
  • the sheet alignment device known from DE 44 16 564 A1 is capable of fulfilling the required alignment precision only to a limited degree. In order to achieve the required alignment precision, an extensive modification of the sheet alignment device from DE 44 16 564 A1 is necessary, which does not appear to be economical.
  • the sheets are conveyed on the feeder table in a ragged or uneven arrangement before they are aligned on the side and pull guides provided on the surface of the feeder table.
  • the materials is transferred in an aligned condition to a pre-gripper, which accelerates the sheet-like material up to machine speed and then delivers it to a paper-guiding cylinder that is located behind the pre-gripper device.
  • a pre-gripper which accelerates the sheet-like material up to machine speed and then delivers it to a paper-guiding cylinder that is located behind the pre-gripper device.
  • Other alignment concepts generally use cylinder-shaped rollers, on the core of which there is a rubber coating.
  • an alignment of sheet-like material is performed during its feeding, by changing the speed between rollers that grip the sheet-like material on the left and right, then the sheet-like material is rotated around a point of rotation that is located on the stationary roller or, during the feeding, outside the roller with the lower rotational speed or between the two rollers.
  • the task of the invention is the substantial improvement of the alignment precision of sheet-like material during feeding in the direction of sheet feed.
  • this task is accomplished by the features of claim 1 .
  • a sensor pair is provided in the conveyor surface for the sheet-like material, within the area of the lateral edges of the sheet-like material, wherein the line-shaped extension reaches over such an area perpendicular to the feed direction of the sheet-like material, in which the respective lateral edge of the sheet will most likely be encountered.
  • the same measuring point is always used for aligning the sheet-like material on the lateral edge.
  • the alignment of the sheet-like materials, following its rotation in a rotating module is independent from the printing matter tolerance, such as, for example, lateral shrinking of the printing matter.
  • the determination of the position of the lateral edge of the sheet-like material results preferably via a sensor array of the sensor pair that is oriented perpendicular to the feed direction of the sheet-like material.
  • a CCD line sensor can be arranged as a sensor pair on the sheet-feeding plane within a feeding arrangement of sheet-like material.
  • the alignment occurs in the area whose leading edge borders on areas of the respective lateral reference edge of the sheet-like material.
  • the smallest offsets can be measured by the line sensors arranged on the conveyor surface of the sheet-like material and corrected by the succeeding segment rollers.
  • a recording of the lateral offset of the rear areas of the lateral edge of the sheet-like material would delay the detection of the offset of the lateral edge to one page; on the other hand, the offset being adjusted on the rear edge of the sheet-like material would be measured so large that, in the case of large formats, it would lie outside of the recognition and recording range of the CCD line sensors.
  • the arrangement recommended according to the invention for the detection of the side positions of a sheet-like material by means of a sensor pair that is arranged in the conveyor surface can particularly be used on sheet-processing printing presses or according to the principle of electrography or electro-photography, or also on other digital printing presses.
  • Essential for the transmission of the printing image to the surface of the sheet-like material is its correct alignment in relation to its feed direction through the printing press or the printer.
  • FIG. 1 a apparent positional deviation of a printed printing image relative to the printing matter surfaces receiving this image
  • FIG. 2 an offset of the printing image on the sheet-like material characterized by a rotational offset
  • FIG. 3 an offset of the printing image imprinted on the underside and top side of a sheet-like material in first form and reprint
  • FIG. 4 the lateral view of a sheet intake area of a sheet-processing machine reproduced schematically
  • FIG. 5 top view of the alignment components, the sensory mechanism, and the drives for the sheet-like material relative to the rotation elements aligning its feed direction
  • FIG. 6 the rotation elements designed as segment rollers above the sheet conveyor surface of the sheet-like material
  • FIG. 7 the alignment of a sheet-like material with the drives of the segment rollers effecting the alignment.
  • the representation according to FIG. 1 shows a sheet-like material, for example, a printing sheet 1 , which is aligned at a right angle to its feed direction 22 .
  • Imprinted on the surface of the printing sheet 1 is a printing image 2 that is surrounded by a frame-like border 3 .
  • the marked deviations of ⁇ x or ⁇ y within the printing surfaces 2 and the frame 3 which indicate a positional error in the x and y directions, can be adjusted by pressing on the printing image 2 on the surface of the printing sheet 1 .
  • the deviations designated by reference numbers 4 and 5 respectively are positional deviations, whereas in the representation according to FIG. 2, angle deviations ⁇ ⁇ of printing image 2 are represented in relation to its position on the printing sheet 1 .
  • the apparent angle errors ⁇ are designated by reference number 6 .
  • the printing image 2 can be imprinted at the indicated positions on the surface of the printing material 1 , during which this (material) is conveyed forward, with its leading edge 23 in the sheet feed direction.
  • the representation according to FIG. 3 shows in a schematic view the so-called turn registration, wherein the offsets appearing respectively between the printing images 2 on the front and reverse sides of the sheet-like material 1 are marked by reference number 7 .
  • these are designated by reference number 7 or with “and”.
  • the turn registration particularly plays a role in the case of translucent papers of marginal weight and extremely light paperweight, as well as of brochure printing.
  • FIG. 4 shows in a schematically reproduced lateral view the intersecting point of sheet alignment and the ascent onto a conveyor belt.
  • An aligning unit 8 precedes a conveyor belt 10 , which encircles a run-up roller 11 or, respectively, a control roller 12 , on the surface of which the sheet-like material 1 is transported up to the conveyor surface 9 .
  • the alignment unit 8 After passing the alignment unit 8 , which will be described in more detail below, the aligned sheet-like material 1 reaches the surface of the conveyor belt 10 at the conveyor surface 9 .
  • the run-up roller 11 the sheet-like material 1 is admitted by means of an adjustment flap or adjustment lip, which is movable in the direction of adjustment 13 .
  • the adjustment lip or adjustment flap can be a plastic component that can be moved from an engaged position 13 . 1 to a disengaged position 13 . 2 .
  • this is represented merely schematically in solid or dotted lines, wherein, for the adjustment, a separate drive in the form of a pneumatically actuating regulator, an electrical drive, can be provided, just as an adjustment by manual means is also conceivable.
  • an adjustment flap or an adjustment lip By means of an adjustment flap or an adjustment lip, a pressing of the sheet-like material 1 onto the surface of the conveyer belt 10 occurs, wherein at the moment of adjustment, the sheet-like material 1 is located in its aligned state.
  • the sheet picked up on the surface of the conveyer belt 10 passes a loading unit 14 .
  • an electrode 15 which effects a static loading of the sheet-like material 1 and thereby provides for its adhesion to the surface of the supporting conveyer belt 10 , is contained within a hood-shaped covering.
  • a leading edge sensor 17 which is only schematically reproduced in the representation according to FIG. 4, is placed behind the loading device 14 .
  • This sensor is comprised of a radiation source 18 , which precedes a lens arrangement 19 and which is arranged underneath the sheet conveyer surface 3 .
  • the radiation field 20 emanating from the lens arrangement 19 penetrates the sheet conveyer surface 9 and encounters an aperture arrangement that is provided above the conveyer surface 9 of the sheet-like material 1 .
  • the aperture arrangement is followed by a receiver 21 , which senses and signals the presence of a leading edge 23 of the sheet-like material 1 in correspondence with the radiation penetrating the aperture arrangement.
  • the top view shows the alignment unit 8 , the components of which are reproduced here in schematic representation.
  • the alignment unit 8 is reached by a sheet-like material 1 that is transported in the feed direction 22 .
  • the leading edge 23 of the sheet-like material 1 is offset in relation to the feed direction 22 of the sheet-like material 1 , whereby a slanted progression of the lateral edge 24 of the sheet-like material 1 becomes apparent.
  • the driver 27 marked with M 1 or M 2 , which drive rotational elements 25 via single axes 32 , are accelerated to the rate of feed.
  • Control of the drives 27 (M 1 or M 2 ), which is triggered via the light barrier 26 , ensures that each sample of sheet-like material 1 comes into contact with identical peripheral sections of the rotation elements 25 , which are arranged as segment rollers in the preferred embodiment. Possibly occurring differences of the feed movements, which could be traced back to the dimensional and shape tolerances of the two rotation elements 25 , thereby occur identically in each sample of the sheet-like material 1 and can easily be calibrated out.
  • the sheet-like material 1 is transported at the rate of feed over one of the additional light barriers 30 . 1 , which are located behind the first light barrier 26 .
  • This light barrier 30 . 1 can, for example, be positioned behind a CCD sensor cell, which extends essentially perpendicular to the feed direction of the sheet-like material 1 .
  • a counter begins to count in motor steps.
  • the counting process is then ended and the determined difference is stored when the second sensor trips the light barrier 30 . 1 .
  • the CCD line sensors of the sensor pair 30 are embedded in the feed surface of the sheet in such a way that they do not impede the transport of the sheet-like material 1 .
  • a correction value is determined and communicated, as an additional feed, to the segment roller drive that was last activated, i.e., either drive 27 , which is designated by M 1 , or drive 27 , which is designated by M 2 .
  • the rotation bodies 25 which are appropriately shaped as segment rollers, are accelerated to the rate of feed until the preset path difference is completely equalized and, thereby, the sheet leading edge 23 of the sheet-like material 1 is aligned precisely perpendicular to the feed direction 22 of the sheet-like material 1 .
  • the sheet leading edge 23 is oriented exactly perpendicular to the feed direction.
  • the sheet-like material 1 is transported in the feed direction 22 and delivered from the first pair of segment rollers 25 to the subsequently arranged pair of rotation bodies 25 , which can be contained on a common axis 31 .
  • the segment roller pair 25 that is driven by drive 27 , or M 1 , and drive 27 (M 2 ) is switched off and moves into its resting position, where it does not come into contact with the sheet-like material 1 with its peripheral surfaces.
  • the sheet-like material 1 that is now correctly aligned in relation to its relative position then ascends onto the sensor field 30 , e.g., onto the CCD line, where the position of the lateral edges 24 of the sheet-like material is determined.
  • a positional change for drive 27 which is designated by M 4 , is ascertained from the determined measurement value.
  • the drive shaft of drive M 4 extends parallel to the feed direction 22 of the sheet-like material 1 .
  • a correction of the position of the sheet-like material 1 occurs parallel to its feed direction 22 , (cf. FIG. 7) (i.e., a lateral alignment of the sheet-like material).
  • FIG. 6 shows a possible embodiment variant of the rotation elements 25 that are contained in the alignment unit 8 located above the conveyer surface 9 .
  • the rotation elements 25 are designed, in the preferred embodiment, as segment rollers, which have a peripheral surface that is characterized by an interruption.
  • the segment rollers 25 rotate in the rotational direction 34 characterized by the depicted arrow and describe an approximate 3 ⁇ 4 circle in relation to their respective rotational axis.
  • a roller that supports a sheet-like material 1 is depicted. This can be designed in one piece, or it can receive a coating on its periphery.
  • the rotation bodies that serve as segment rollers 25 are depicted in a resting position in the left part of FIG. 6, while in the right part of FIG. 6, they seize, with the peripheral surface, a sample that is transported in the feed direction 22 of the sheet-like material 1 . This is thereby transported according to the rotational direction 34 in the feed direction 22 of the sheet-like material 1 .
  • FIG. 7 shows the correction of the relative position of the sheet-like material 1 when it passes the alignment unit 8 . In the position of the sheet-like material 1 shown in FIG.
  • the sheet-like material 1 is now correctly aligned laterally to the feed direction 22 by a displacement of the sheet-like material, via drive M 4 , which occurs on its conveyer surface 9 before reaching the adjustment element 13 and before ascending onto the conveyer belt positioned behind it.
  • drive M 4 which occurs on its conveyer surface 9 before reaching the adjustment element 13 and before ascending onto the conveyer belt positioned behind it.
  • CCD line sensors are used as sensor pair 30 on the conveyer surface 9 for the sheet-like material 1 , then these can extend perpendicular to the feed direction 22 of the sheet-like material 1 to such an extent that all common printed material formats can be accommodated, regardless of whether they are for paper, for cardboard, or also for foils.
  • This enables an increase in the flexibility of a printing press used for diverse printed materials, regardless of whether it is an electrographical, an electro-photographic, or another digital printing machine.
  • the proposed method for aligning the sheet-like material 1 before the ascension onto a conveyer belt 10 can naturally also be used on conventionally operating rotary printing presses, which process sheet-like material 1 .
  • the line sensor pair 30 should be arranged at the end of the feeder table directly in the area of the side and pull guides, which precede a pre-gripping device with which the aligned sheet-like material 1 is accelerated to machine speed and delivered to paper-guiding cylinders.

Landscapes

  • Registering Or Overturning Sheets (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Laminated Bodies (AREA)
  • Cell Separators (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
US09/855,479 2000-05-17 2001-05-15 Method for alignment of sheet-like materials Abandoned US20020017755A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10023919A DE10023919A1 (de) 2000-05-17 2000-05-17 Verfahren zur Ausrichtung bogenförmigen Materials
DE10023919.6 2000-05-17

Publications (1)

Publication Number Publication Date
US20020017755A1 true US20020017755A1 (en) 2002-02-14

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US09/855,479 Abandoned US20020017755A1 (en) 2000-05-17 2001-05-15 Method for alignment of sheet-like materials

Country Status (5)

Country Link
US (1) US20020017755A1 (enrdf_load_stackoverflow)
EP (1) EP1170237B1 (enrdf_load_stackoverflow)
JP (1) JP2002019999A (enrdf_load_stackoverflow)
AT (1) ATE332863T1 (enrdf_load_stackoverflow)
DE (2) DE10023919A1 (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6761351B1 (en) * 2003-01-30 2004-07-13 Xerox Corporation Registration system effective drive roll radius compensation
US7036811B2 (en) * 2003-01-30 2006-05-02 Xerox Corporation Registration system paper path length compensation
US20080136092A1 (en) * 2006-12-06 2008-06-12 Jack Gaynor Elliot Gain-scheduled feedback document handling control system
US20080136094A1 (en) * 2006-12-06 2008-06-12 Jack Gaynor Elliot Gain-scheduled feedback document handling control system
US20090026684A1 (en) * 2007-07-24 2009-01-29 Canon Kabushiki Kaisha Image processing apparatus
US20110049794A1 (en) * 2009-08-27 2011-03-03 Canon Kabushiki Kaisha Image forming apparatus
US8550456B2 (en) 2011-07-28 2013-10-08 Canon Kabushiki Kaisha Image forming apparatus
US10488805B2 (en) * 2016-11-30 2019-11-26 Konica Minolta, Inc. Image forming apparatus

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Publication number Priority date Publication date Assignee Title
DE102005060772B4 (de) * 2005-12-16 2010-02-18 Eastman Kodak Co. Verfahren zur Erkennung einer Kante eines Bedruckstoffes
JP5043492B2 (ja) 2007-04-02 2012-10-10 キヤノン株式会社 シート搬送装置及び画像形成装置
JP2011153032A (ja) * 2011-05-19 2011-08-11 Ricoh Co Ltd シート搬送装置および画像形成装置

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US4755855A (en) * 1985-05-30 1988-07-05 Kabushiki Kaisha Toshiba Image forming apparatus with a forming position correcting function
JPH04362661A (ja) * 1991-06-10 1992-12-15 Fuji Xerox Co Ltd 画像形成装置の用紙反転搬送装置
US5293205A (en) * 1992-01-13 1994-03-08 Delphax Systems Side to side sheet inverter
US5322273A (en) * 1993-05-18 1994-06-21 Eastman Kodak Company Sheet registration mechanism
JPH08143185A (ja) * 1994-11-25 1996-06-04 Ricoh Co Ltd 画像形成装置
JPH09267528A (ja) * 1996-03-29 1997-10-14 Ricoh Co Ltd 記録紙反転装置
US5697609A (en) * 1996-06-26 1997-12-16 Xerox Corporation Lateral sheet pre-registration device
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
US5887996A (en) * 1998-01-08 1999-03-30 Xerox Corporation Apparatus and method for sheet registration using a single sensor

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6761351B1 (en) * 2003-01-30 2004-07-13 Xerox Corporation Registration system effective drive roll radius compensation
US7036811B2 (en) * 2003-01-30 2006-05-02 Xerox Corporation Registration system paper path length compensation
US20080136092A1 (en) * 2006-12-06 2008-06-12 Jack Gaynor Elliot Gain-scheduled feedback document handling control system
US20080136094A1 (en) * 2006-12-06 2008-06-12 Jack Gaynor Elliot Gain-scheduled feedback document handling control system
US7712738B2 (en) * 2006-12-06 2010-05-11 Xerox Corporation Gain-scheduled feedback document handling control system
US7712737B2 (en) * 2006-12-06 2010-05-11 Xerox Corporation Gain-scheduled feedback document handling control system
US20090026684A1 (en) * 2007-07-24 2009-01-29 Canon Kabushiki Kaisha Image processing apparatus
US8351841B2 (en) * 2007-07-24 2013-01-08 Canon Kabushiki Kaisha Image processing apparatus
US20110049794A1 (en) * 2009-08-27 2011-03-03 Canon Kabushiki Kaisha Image forming apparatus
US8342517B2 (en) 2009-08-27 2013-01-01 Canon Kabushiki Kaisha Image forming apparatus
US8550456B2 (en) 2011-07-28 2013-10-08 Canon Kabushiki Kaisha Image forming apparatus
US10488805B2 (en) * 2016-11-30 2019-11-26 Konica Minolta, Inc. Image forming apparatus

Also Published As

Publication number Publication date
EP1170237B1 (de) 2006-07-12
EP1170237A3 (de) 2003-01-29
EP1170237A2 (de) 2002-01-09
JP2002019999A (ja) 2002-01-23
DE10023919A1 (de) 2001-11-22
DE50110435D1 (de) 2006-08-24
ATE332863T1 (de) 2006-08-15

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Owner name: NEXPRESS SOLUTIONS LLC, NEW YORK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DOBBERSTEIN, DRETER;HAUPT, JOACHIM;PETER, KARLHEINZ;AND OTHERS;REEL/FRAME:012144/0070;SIGNING DATES FROM 20010605 TO 20010615

STCB Information on status: application discontinuation

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