US3809389A - Sheet feeding apparatus for printing presses - Google Patents

Sheet feeding apparatus for printing presses Download PDF

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Publication number
US3809389A
US3809389A US00314338A US31433872A US3809389A US 3809389 A US3809389 A US 3809389A US 00314338 A US00314338 A US 00314338A US 31433872 A US31433872 A US 31433872A US 3809389 A US3809389 A US 3809389A
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US
United States
Prior art keywords
sheet
slide bar
carrier
feeding apparatus
sheet 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.)
Expired - Lifetime
Application number
US00314338A
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English (en)
Inventor
A Wirz
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.)
Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/0808—Suction grippers
    • B65H3/0816—Suction grippers separating from the top of pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/33—Modifying, selecting, changing orientation
    • B65H2301/331—Skewing, correcting skew, i.e. changing slightly orientation of material
    • 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
    • B65H2511/24—Irregularities, e.g. in orientation or skewness

Definitions

  • Foreign Application Priority D t sheet feed device includes a carrier operable between Dec 18 I971 Gama 1 2,6308 ⁇ a pick-up position and a feed position.
  • the carrier iny cludes a carrier bar having a central section and two [52] U S Cl 271/91 271/60 271/93 outer sections rotatably mounted relative to the cen- [51] a 9/14 tral section.
  • Suction grippers are mounted on the two [58] Fieid 90 107 outer sections and also a suction gripper may be mounted on the central section.
  • a slide bar means is provided for varying the travel pattern of the outer [56] References Cited suction grippers such that the latter are operable to align a sheet as the sheet is transported from the stack UNITED STATES PATENTS towards the sheet feed device. 2,995,360 8/1961 Simpson 271/107 3,360,262 l2/I967 Kekopoulos et al. 271/60 x 8 Claims, 4 Drawlng Flgllres 'MWTEM 7 291 4 $809389 SHEET 1 BF 3 all FIG: 2
  • the invention relates to a sheet feeding device for printing machines and more particularly .to a sheet feeding device, having conveyor suction grippers for lifting sheets from a stack in which the height of the stack can be adjusted by pneumatically or electrically operated means.
  • The, conveyer suction grippers pick up the top sheet from the stack and carry it in one direction toward further sheet transport means.
  • the conveyor suction grippers are pivotally mounted on a carrier bar which has imparted thereto an oscillatory movement by means of an eccentric or cam drive and which is. guided rectilinearly by a slide bar arrangement.
  • a sheet feeding device in which two suction grippers are suspended by a shaft having an oscillatory motion and which are guided parallel to the surface of the pile of sheets by means of a control cam.
  • One of the suction grippers is pivoted with respect to the other and is adjustable by means of an adjustable control lever, whereby a lead or lag of the suction surface of the pivoted suction gripper relative to the other one may be obtained during the feeding motion.
  • the lead or lag of the one suction gripper relative to the other causes alignment of the sheet being gripped and lifted from the pile during the feeding motion toward the further sheet transport means.
  • Such alignment means can advantageously be used for smaller sheet sizes.
  • the tilting of the gripped sheet about one of the two suction grippers has a very detrimental effect in that the sheet is also moved in its central region, during its alignment, that is the sheet moves forward or back in its entirety.
  • This displacement of the sheet in'or toward the transport direction can cause registration differences in the case of relatively large .corrections,'particularly with the larger sheet sizes, or make necessary an adjustment of the suction head relative to the machine.
  • the tube carrying the conveyer suction device is pivoted at its center about a vertical axis and is rigidly connected with a lever, the free end of which slides in a U-shaped guide bar which can be adjusted at an angle relative to the direction of travel. Because the two conveyer suction devices can pivot about a vertical axis, the sheet is rotated during its alignment in such a manner that its front edge assumes the desired position without a detrimental displacement of the sheet in the transport direction.
  • this known sheet feeding device has another disadvantage.
  • at least a third suction gripper must be attached on the conveyer bar, in order to prevent excessive sagging of the sheet being transported. Otherwise, the blower air would be prevented from separating the sheet properly from the pile and from carrying it forward, so that its front edge cannot be reliably gripped by the sheet transport means which passes the sheet on.
  • the arrangement of a third suction gripper at the center of the tube carrying the two conveyer suction gripper interferes with the support of the tube, which must be located at that position.
  • the conveyer suction grippers In the case of larger size sheets, the conveyer suction grippers must furthermore be provided at a greater distance from the rear edge, which leads to a large overhang of the support and guidance members of the carrier tube of the conveyer suction grippers. If, however, the vertical axis of the carrier tube support were displaced on the center line of the sheet, a lateral dislocation would occur in the alignment of the sheet to be transported and depending on the size of this displacement, the registration of the sheet would also be impaired.
  • the present invention overcomes the aforementioned prior art disadvantages by providing at the cen ter of the carrier bar a conveyer suction gripper which is held in vertical position by a slide bar during the oscillatory movement of the carrier bar.
  • the carrier bar is divided into three sections, the outer sections being rotatable or pivotably mounted on the center section of u the carrier bar and each outer section carrying an additional conveyer suction gripper.
  • Each of the pivoted outer sections is guided by a pivoted slide bar, and the two pivoted slide bars can be adjusted by a positioning device to the same angle in opposite directions.
  • both adjustable slide bars are swung from their null or neutral positions, one of the outer conveyer suction grippers executes an additional oscillating motion in the transport direction, and the other, outer conveyer suction gripper executesan oscillatory movement of the same magnitude but in the opposite direction.
  • the transported sheet thereby rotates about the vertical axis of the middle-suction gripper, which is designed as a drop or gravity gripper. Practically no lateral or longitudinal displacement of the transported sheet occurs.
  • drive holder means are pivoted at the free end of an oscillating crank of an eccentric drive, such drive holder means extending in the direction of the sheet transport and being guided along a straight line path by the slide bar.
  • the carrier bar of the conveyer suction gripper is arranged at the free end of the drive holder means.
  • the slide bars are provided in the form of U-shaped guide rails which extend in the direction of the sheet transport and which have an arc-like curvature.
  • FIG. 1 is a partial elevational view of a suction head disposed above a stack of sheets which are to be fed by the suction head.
  • FIG. 2 is a partial plan view of the suction head shown in FIG. 1.
  • FIG. 3 is a plan view, partially in section, showing the various operating. elements of the suction head according to one embodiment of the invention.
  • FIG. 4 is an elevation view of the various operating elements shown in FIG. 3.
  • a suction head 2 arranged above a stack of sheets 1 of a printing machine (not shown).
  • the suction head 2 is disposed centrally, considered in a lateral direction, and in the region of the rear edge of the stack of sheets 1.
  • the height of the stack of sheets 1 can be adjusted by various means (not shown) for example by pneumatically or electrically operated devices.
  • the suction head 2 always feeds the top sheet of the stack of sheets 1 to further transport means which consists of a tape roller 8 and timing rolls 9.
  • the aforementioned feeding is effected with the cooperation of a sensing foot 3, separator suction grippers 4 and conveyer suction grippers 5,6,7.
  • the conveyer suction grippers 5 to 7 are attached to a carrier bar 10 which is divided into three sections,
  • the conveyer suction gripper 6 is designed as a drop or gravity gripper and is mounted on the central bar section 11.
  • the suction gripper 6 situated exactly along the center line of the suction head 2 as shown in FIG. 2.
  • the conveyer suction gripper 5 is attached to the carrier tube 13, and the conveyer suction gripper 7 to the carrier tube 12.
  • Both conveyer suction grippers 5 and -7 are also designed as dropor gravity grippers.
  • the central bar section 11 is operatively connected by means of two brackets 14 and 15 to a shaft 16 which is mounted in sleeve, bearings 18 and which are pivoted at the free end of a conventional oscillating crank 17 of an eccentric drive (not shown).
  • a support arm 19 is fixed to the bracket 15 at about halfway along the length of bracket 15.
  • the support arm 19 projects vertically and rotatably carries a roller 20 which travels in a guide rail 21.
  • the guide rail .21 is secured to a housing 22 of the suction head 2.
  • the guide rail 21 is curved in arc fashion in such a manner to compensate the swinging motion of the conveyer suction gripper 6 which would otherwise be caused by the oscilatory motion of the crank 17.
  • a guide lever 23 is secured to the carrier tube 12 and the free end of the guide lever carriers a guide roller 24 which travels in a U-shaped guide rail 25.
  • the guide rail 25 is pivoted at its rear end about a fixed horizontal axis 30, the angular position of the guide rail 25 relative to the horizontal can be changed by a setting device 26.
  • the arrangement is such that any pivotal movement of the U- shaped guide rail 25 about axis 31 is transmitted to the other U-shaped guide rail 29.
  • the setting device 26 is provided with a hand wheel 33 above the suction head housing 22 and is operable to pivot the guide rail 25 upwardly or downwardly about fixed pivot axis 30.
  • the two.U-shaped.guide rails 25 and 29 are also curved in the form ofan arc like the guide rail 21 in such a manner that the conveyer suction grippers 7 and 5 secured to the outer carrier tubes 12 and 13 are maintained in a vertical disposition during the oscillating movement of the crank 17.
  • the separator suction gripper 4 and the conveyer suction grippers 5 to 7 are operatively connected to and in communication with a rotary valve 34 mounted on the suction head 2 by means of hose lines 35.
  • Two other hoses 36 connect the rotary valve 34 with a blower or other pressure or vacuum generator.
  • a further hose 50 leads from the rotary valve 34 to a blower rod 38 at which loosening blowers 39 as well as a stripper brush 40 are mounted.
  • Another hose 37 leads to the sensing foot 3.
  • the adjustment takes place to such an extent that the two outer conveyer suction grippers 5 and '7 execute during the transport of the sheet, on the basis of the adjustment of their guide rails 25 and 29, oscillating movements in opposite directions of such magnitude that the tilt of the sheet is cancelled by rotation of suction grippers 5 and 7 each the same amount about the-middle conveyer suction gripper 6.
  • the sheet 41 is passed on to the roller 8 and the timing rolls 9 in proper alignment.
  • the aforementioned oscilating movement of the outer conveyer suction grippers 5 and 7 about the suction gripper 6 starts when the conveyer suction grippers 5 and 7 are in their rear position indicated at 42 in FIG. 2 and has its maximum extent in the front position of the conveyer suction grippers as indicated at 43 in FIG. 2.
  • the suction cups of the conveyer suction gripper 5 and 7 always occupy the same position in their rear position 42 as is the case of the suction cup of the not-rotatable central conveyer suction gripper 6. It will be seen that the aforementioned oscillating movement is achieved because the guide rails 25 and 29 are pivotally moved about axis 30 in opposite pivotal directions. Due to the fact that the two outer conveyer suction grippers 5 and 7 execute opposite oscillating motions, the oscillation movement of each conveyer suction gripper 5 or 7 needs to be only half as large as if the oscillating motion was carried out with only one conveyer suction gripper as in known devices.
  • the suction cup of the central conveyer suction gripper 6 can rotate about its vertical axis, so that the sheet to be aligned can be swung around such vertical axis without the formation of creases.
  • the use of three conveyer suction grippers has another advantage in that the support air discharging from the sensing foot 3 can lift the front edge of the sheet 41 reliably onto the belt roller 8.
  • the invention is not limited to the illustrated embodiment.
  • the invention may be modified in such a manner to provide a lever linkage instead of the guide arms 23 and 27, such that the conveyer suction grippers 5 and 7 can be advanced still further in the direction toward the belt roller 8 and timing rolls 9.
  • Sheet feeding apparatus for printing presses and the like in which sheets are lifted from a stack and transported towards a sheet feed device, comprising carrier means, operable means for moving said carrier means between apick-up position and a feed position, said carrier means comprising a carrier bar having a central section and two outer sections rotatably mounted on either side of said central section, two outer suction grippers, one carried on each of said outer sections, first slide bar means carried by each of said outer sections, and positional means comprising a rocker arm operable to adjust each of said slide bar means to the same angular extent but in opposite directions so that said slide bar'means cause rotation of the outer sections through equal but oppositely directed angles relative to the central section during forward movement of the carrier bar, and adjustment means for said rocker arm, said outer suction grippers being operable thereby to align a sheet as the latter is transported from said stack towards said sheet feed device.
  • Sheetfeeding apparatus a central suction gripper carried on said central section of said carrier bar, said central suction gripper and said outer suction grippers being generally aligned along a straight line extending perpendicular to said path of movement of said carrier means when the latter is in said pick-up position, said positional means being operable to vary the path of said slide bar means so that said outer suction grippers and said central suction gripper are aligned along a straight line which extends at an acute angle relative to said path of movement of said carrier means when the latter is in said feed position.
  • Sheet feeding apparatus wherein said means operable to vary the paths of said slide bar means comprise a pivotal drive member pivotal back and forth about a pivot axis to impart a back and forth oscillating motion to said first slide bar means, said carrier means comprising second slide bar means maintaining said central suction gripper in a vertical plane disposition during said oscillating motion of said first slide bar means.
  • Sheet feeding apparatus according to claim 4 wherein said second slide bar means comprises U- shaped guide rails extending generally in the direction of sheet feed in an arcuate configuration.
  • Sheet feeding apparatus according to claim 5 wherein rollers are mounted on said drive holder means, said rollers being movably carried in said U- shaped guide rails, 7.
  • Sheet feeding apparatus according to claim 1 wherein said first mentioned slide bar means comprises U-shaped guide rails extending generally'in the direction of sheet feed in an arcuate configuration.
  • said first mentioned slide bar means comprises levers attached to said outer sections of said carrier bar, said levers having mounted thereon rollers which are movably carried in said U-shaped guide rails.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US00314338A 1971-12-18 1972-12-12 Sheet feeding apparatus for printing presses Expired - Lifetime US3809389A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2163083A DE2163083C3 (de) 1971-12-18 1971-12-18 Saugkopf einer Bogenanlegevorrichtung für Druckmaschinen

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US3809389A true US3809389A (en) 1974-05-07

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US00314338A Expired - Lifetime US3809389A (en) 1971-12-18 1972-12-12 Sheet feeding apparatus for printing presses

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US (1) US3809389A (de)
CH (1) CH543439A (de)
DE (1) DE2163083C3 (de)
IT (1) IT975238B (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4337935A (en) * 1979-05-24 1982-07-06 Canon Kabushiki Kaisha Copying apparatus having a manual insertion paper feeding mechanism
US4744198A (en) * 1986-08-21 1988-05-17 Engerprises International, Inc. Roll wrapping head storage and delivery apparatus and method
US4786043A (en) * 1985-10-10 1988-11-22 Zvs - Adamovsky Strojirny Koncernovy Podnik Adamov Device for feeding single paper sheets from a pile
US4886261A (en) * 1987-02-25 1989-12-12 Heidelberger Druckmaschinen Ag Sheet feeder for a printing machine
US5613671A (en) * 1994-03-26 1997-03-25 Heidelberger Druckmaschinen Ag Device for correcting skewed sheets in a feeder of a sheet-fed printing press
US5895037A (en) * 1996-01-17 1999-04-20 Heidelberger Druckmaschinen Ag Drive transmission for a pull sucker or forwarding sucker, in particular, for a device for correcting misaligned sheets
US5984296A (en) * 1995-06-23 1999-11-16 Heidelberger Druckmaschinen Aktiengesellschaft Device for cyclically lifting and lowering a lifting sucker in a feeder of a sheet-processing machine
US6481953B1 (en) * 1999-04-16 2002-11-19 Ltg Mailander Gmbh Process and apparatus for isolating flexible flat objects
US6499735B2 (en) * 1999-12-17 2002-12-31 Heidelberger Druckmaschinen Ag Method and device for separating and transporting sheets of paper
WO2006091558A1 (en) * 2005-02-22 2006-08-31 Kodak Graphic Communications Canada Company Plate handling system
US20070169655A1 (en) * 2005-02-22 2007-07-26 Cummings Calvin D Plate handling system
EP1980510A1 (de) * 2007-04-11 2008-10-15 Punch Graphix International N.V. Ladegerät, Eingabeabschnitt, Verfahren zum Laden einer Druckplatte, Computersystem und Computerprogramm
CN102408022A (zh) * 2011-11-10 2012-04-11 河北玉田兴业印刷机械有限公司 一种高速递纸装置
US20120289391A1 (en) * 2011-05-12 2012-11-15 SN Maschinenbau, GmbH Apparatus for simultaneously separating a plurality of pouches, transferring the pouches and method of same

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2017052B (en) * 1978-02-07 1982-11-03 Edstrom L G Collator for sheet material
DE4005144C2 (de) * 1990-02-17 1994-02-10 Spiess Gmbh G Bogenanleger
DE4006635A1 (de) * 1990-03-03 1991-09-05 Georg Binnen Schleppdueseneinrichtung fuer schnellaufende bogenanleger
AT410436B (de) * 2001-01-30 2003-04-25 Oesterr Forsch Seibersdorf Verfahren zum vereinzeln von in einem stapel übereinander angeordneten bögen und vorrichtung zur durchführung des verfahrens
DE10316365A1 (de) * 2003-04-10 2004-11-04 Koenig & Bauer Ag Bogenanleger zum Vereinzeln von Bogen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2995360A (en) * 1959-12-30 1961-08-08 Ibm Document feeding
DE1177652B (de) * 1956-04-07 1964-09-10 Georg Spiess Dr Ing Bogenanlegevorrichtung mit zwei gemeinsam um eine pendelnd bewegte Achse schwenkbaren Saugduesen
US3360262A (en) * 1966-06-16 1967-12-26 Gregory C Kekopoulos Apparatus for moving and aligning limp pieces of material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1177652B (de) * 1956-04-07 1964-09-10 Georg Spiess Dr Ing Bogenanlegevorrichtung mit zwei gemeinsam um eine pendelnd bewegte Achse schwenkbaren Saugduesen
US2995360A (en) * 1959-12-30 1961-08-08 Ibm Document feeding
US3360262A (en) * 1966-06-16 1967-12-26 Gregory C Kekopoulos Apparatus for moving and aligning limp pieces of material

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4337935A (en) * 1979-05-24 1982-07-06 Canon Kabushiki Kaisha Copying apparatus having a manual insertion paper feeding mechanism
US4786043A (en) * 1985-10-10 1988-11-22 Zvs - Adamovsky Strojirny Koncernovy Podnik Adamov Device for feeding single paper sheets from a pile
US4744198A (en) * 1986-08-21 1988-05-17 Engerprises International, Inc. Roll wrapping head storage and delivery apparatus and method
US4886261A (en) * 1987-02-25 1989-12-12 Heidelberger Druckmaschinen Ag Sheet feeder for a printing machine
US5613671A (en) * 1994-03-26 1997-03-25 Heidelberger Druckmaschinen Ag Device for correcting skewed sheets in a feeder of a sheet-fed printing press
US5984296A (en) * 1995-06-23 1999-11-16 Heidelberger Druckmaschinen Aktiengesellschaft Device for cyclically lifting and lowering a lifting sucker in a feeder of a sheet-processing machine
US5895037A (en) * 1996-01-17 1999-04-20 Heidelberger Druckmaschinen Ag Drive transmission for a pull sucker or forwarding sucker, in particular, for a device for correcting misaligned sheets
US6481953B1 (en) * 1999-04-16 2002-11-19 Ltg Mailander Gmbh Process and apparatus for isolating flexible flat objects
US6499735B2 (en) * 1999-12-17 2002-12-31 Heidelberger Druckmaschinen Ag Method and device for separating and transporting sheets of paper
WO2006091558A1 (en) * 2005-02-22 2006-08-31 Kodak Graphic Communications Canada Company Plate handling system
US20070169655A1 (en) * 2005-02-22 2007-07-26 Cummings Calvin D Plate handling system
US7861940B2 (en) 2005-02-22 2011-01-04 Eastman Kodak Company Plate handling system
EP1980510A1 (de) * 2007-04-11 2008-10-15 Punch Graphix International N.V. Ladegerät, Eingabeabschnitt, Verfahren zum Laden einer Druckplatte, Computersystem und Computerprogramm
US20080250959A1 (en) * 2007-04-11 2008-10-16 Herman Van De Straete Loading Device, Input Section, Method For Loading A Printing Plate, Computer System And Computer Program Product
US20120289391A1 (en) * 2011-05-12 2012-11-15 SN Maschinenbau, GmbH Apparatus for simultaneously separating a plurality of pouches, transferring the pouches and method of same
US9944037B2 (en) * 2011-05-12 2018-04-17 Pouch Pac Innovations, Llc Apparatus for simultaneously separating a plurality of pouches, transferring the pouches and method of same
CN102408022A (zh) * 2011-11-10 2012-04-11 河北玉田兴业印刷机械有限公司 一种高速递纸装置

Also Published As

Publication number Publication date
DE2163083B2 (de) 1973-10-18
DE2163083C3 (de) 1974-05-16
IT975238B (it) 1974-07-20
CH543439A (de) 1973-10-31
DE2163083A1 (de) 1973-06-28

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