US3703281A - Sheet feeding apparatus having gripper control, for use with printing machines - Google Patents

Sheet feeding apparatus having gripper control, for use with printing machines Download PDF

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Publication number
US3703281A
US3703281A US171167A US3703281DA US3703281A US 3703281 A US3703281 A US 3703281A US 171167 A US171167 A US 171167A US 3703281D A US3703281D A US 3703281DA US 3703281 A US3703281 A US 3703281A
Authority
US
United States
Prior art keywords
trailing
leading
cam means
cam
shiftable track
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
US171167A
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English (en)
Inventor
Oskar Liebert
Klaus Theilacker
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.)
MAN AG
Original Assignee
MAN Maschinenfabrik Augsburg Nuernberg 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 MAN Maschinenfabrik Augsburg Nuernberg AG filed Critical MAN Maschinenfabrik Augsburg Nuernberg AG
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Publication of US3703281A publication Critical patent/US3703281A/en
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Expired - Lifetime legal-status Critical Current

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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
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/02—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles
    • B65H29/04—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by endless chains or bands
    • B65H29/041—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by endless chains or bands and introducing into a 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
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/02—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles
    • B65H29/04—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by endless chains or bands
    • B65H29/045—Details of grippers
    • B65H29/047—Gripper opening devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/176—Cardboard

Definitions

  • the trailing cam means being formed to have a leading edge outline which matchessubstantially with the trailing edge outline of the leading cam, so that the gripper control follower will be smoothly engaged by both leading and trailing cams to release sheets carried by the grippers, and the release position is readily adjustable for various sizes of printed material.
  • the present invention relates to printing machines, and more particularly to sheet feeding apparatus in connection with printing machines to transport sheets which have been printed on the machines to a stack.
  • Sheet transporting apparatus for use with printing machines has been proposed in which a chain carries grippers which, when they reach the position of the stack, engage a control surface or a camming surface, to release the sheets which they grip.
  • a follower wheel is provided to engage this control surface; an illustration of such a device is found in US. Pat. No. 2,631,038.
  • Controlling the grippers by means of a cam surface consisting of two parts has already been proposed (see German Pat. No. l,2l9,045to which British Pat. No. 1,151,894 corresponds).
  • the leading edge of the cam is interconnected with the trailing cam portion, which is circular, by means of a pivot which can slide along a slit with respect to the sprocket wheel, so that, by means of an intervening link to the sprocket wheel, the position of the trailing edge curve can be matched to the respective position of the leading edge cam curve.
  • This is a complicated arrangement and can be adjusted only over very small limits.
  • Another known control for the grippers utilizes a control cam having a leading portion which is straight and a bent, bow-shaped trailing portion.
  • the control cam can be pivoted by means of a hydraulic transmission, so that the control roll of the grippers engages the cam surface sooner, or later, as desired.
  • This arrangement also, is capable of adjustment only over narrow limits and has the disadvantage that the angle of attack with respect to the roll changes.
  • Single-element straight control cams can be used only when the sprocket wheel for the transport arrangement is beyond the receiving stack, since, otherwise, there is danger that the sheet which is to be stacked is caught again by the grippers which are in the process of reclosing.
  • the gripper control for the sheet transport apparatus of the machine includes a leading cam which is formed as a parallelogram shiftable track, adapted to be engaged by a gripper control follower, which controls the gripper opening.
  • the parallelogram shiftable track is suspended on a pair of swing arms of equal length, one end each being pivoted about leading and trailing points.
  • the shiftable track is so arranged that it has a shallow angle with respect to the center line of the transport conveyor.
  • a trailing cam as provided is formed as a swingable segment-like element, swingable about a pivot point, and having a leading edge located approximately in the prolongation of a line connecting the pivot point of the segment-like elementand the suspension point of the trailing swing arm of the shiftable track.
  • the trailing cam is formed to have an outline merging smoothly with the outline of the leading cam means, so that the gripper control is smoothly engaged by the overall, articulated cam arrangement formed of the leading and trailing cam means.
  • the apparatus provides wide adjustment of the opening of the grippers, depending on paper quality, printing speed, paper thicknesses and other perameters.
  • the inclination of the leading curve with respect to the gripper control will be constant, due to the parallelogram attachment, and thus hard impact of the control followers on the grippers with the gripper opening cams is avoided.
  • the trailing ends of the leading cam are preferably formed to surround the portion of the trailing cam itself so that theentire running width of the fol-. lower rollers on the grippers can be completely utilized in the region of the greatest application of force thereon, that is, just upon opening of the grippers.
  • the arrangement can be simply manufactured and is, therefore, inexpensive.
  • FIG. 1 is a highly schematic side view of the control for the transport grippers
  • FIG. 2 is a top view of the transport gripper control, partly developed in the direction of the arrow A of FIG. 1.
  • Sheets are to be stacked on a stack 1, located beyond the sheet transport chains. They are transported by means of a gripper arrangement 3, secured to endless chains 2, and removing the sheets from the printing presses, in the direction of the arrow of FIG. 1.
  • a gripper arrangement 3 secured to endless chains 2, and removing the sheets from the printing presses, in the direction of the arrow of FIG. 1.
  • Such grippers and sheet removal conveyors are well known in the art.
  • the gripper shaft 4 is connectedto a torsion bar suspension control follower roll 5, which cooperates with a leading cam portion 6 and a trailing cam portion 7.
  • grippers 3 open and release and the printed sheet floats on stack 1, due to inertia, and gravity.
  • Heavy paper, or carton stock which was printed requires early opening of the gripper in order to prevent hard impact of the sheets on the abutment and limit stops of the stack.
  • the trailing cam track 7 is provided in order to hold grippers 3 open for such a period that the once released sheet will not be caught again by the grippers and, inadvertently, continued to be transported.
  • the leading cam 6 is formed as a track 6' which forms part of a parallelogram suspension, that is, which is suspended by a pair of crank arms, schematically indicated at 8, 9, which are of equal length.
  • the cranks 8, 9, may be defined as the distance from a pivot point l2, 12 thereof to the linkage point 14, 14 of arms 8, 9, with the track portion 6.
  • the crank arm 9, itself, may form part of a double armed lever 10, and the pivot point of the trailing arm 8, remote from the track portion 6' is coaxial with the swing, or center pivot point of the trailing cam portion 7.
  • the position of track portion 6' is adjustable by means of an adjustment rod 11, engaging the double arm lever '10.
  • Adjustment rod 11 may be manually adjusted; as shown, however, the position of rod 11 can be controlled automatically in dependence on machine speed by providing a transducer-converter. 31, receiving a machine input, which controls as its output the position of rod 11, as schematically indicated by the connecting arrow 30.
  • the transducer-converter can be entirely mechanical, as schematically shown acentrifugal controller, or maybe electrical, hydraulical or otherwise, so long as machine speed is senses and converted into motion being transmitted to arm 10. Arm itself pivots about point 12', which causes a shift in height of the leading edge 6 with respect to the conveyor chain, and additionally swinging of the trailing cam portion 7 about shaft 12 of the sprocket wheel 13.
  • the transfer function relating speed of the main drive, and the position change of the cam tracks may be linear, or non-linear, to provide an adjustable transmission ratio which can take into consideration format, that is size of the printed sheet, as well as paper quality.
  • transducer-converter 31 may have linear, or nonlinear, or manually adjustable and variable transfer characteristics.
  • the two final positions of which the adjustment cams, that is element 6 and element 7 are capable is illustrated by full line and chain dotted lines, respectively.
  • the controlling edge of the leading cam 6 is arranged to form a flat, shallow angle with respect to the center line of the conveyor chain 2. If so arranged, a maximum adjustment angle of approximately 40, that is, a shift in position of 40 of the lever 10, and hands of arm 8, provides a large range of adjustment, as indicated in FIG. 1, without change of the angle of attack of roller 5 with respect to track 6'.
  • the transfer of control surface from track 6 to the trailing cam 7 should be smooth.
  • the start of the trailing cam is arranged to be approximately in the prolongation of a connecting line interconnecting the pivot point 12 of the trailing curve 7 and the suspension point 14 of the trailing end of the leading cam 6.
  • the trailing suspension point 14 of the leading cam track 6 can be, itself, connected on or formed on the trailing cam 7.
  • the controlling cam edge of the trailing cam 7 is eccentric with respect to its axis 12, in such a way that the radial distance decreases in direction of movement of the control roller 5.
  • the track 6' is arranged to partly overlap with the cam surface 7 and, in this region, is formed with a bowed control edge 15 having a lesser radius than the radius of the cam portion 7.
  • a spring 16 is hooked to the end of the trailing cam opposite the cam surface 7 to interconnect with the shaft point, or pivot point of the double arm lever 10.
  • the leading earn 6 both overlaps as well as surrounds cam 7, as well as the double armed lever 10. This permits engagement by the full width of roller 5, and particularly during the eatest acceleration, and thus during occurrence of the greatest dynamic forces, that is, upon opening of the grippers; the inter-engaging portions themselves become active only in the region of substantially lesse forces being transferred to the rollers.
  • Both cam curves 6, and 7 can be adjusted during actual operation, and without stopping the machine; the limit of adjustment is provided by an elongated opening 17 in the double arm lever 10, inwhich a pin 18 fixed in position on the machine is engageable.
  • a sheet transport apparatus having a chain conveyor (2), gripper means'(3, 4) secured to the chain conveyor, control means for said grippers and a follower (5) adapted to be contacted by said control means, said control means comprising leading cam means (6) being formed as a parallelogram-shiftabletrack (6') and leading and trailing swing arms (8,9) suspending said shiftable track (6'), said swing arms being of equal length and having one end each pivotable about leading and trailing points (14, 12), the shiftable trackbeing 7 arranged at a shallow angle with respect to the center line of the chain conveyor (2);
  • trailing cam means (7) formed as a swingable segmental-like element swinging about a pivot point (12) and having a leading edge thereof located approximately in the prolongation of a line connecting said pivot point thereof (12) and the suspension point (14) of the trailing swingable arm with the shiftable track (6' the trailing cam means (7) being formed to have an outline merging smoothly with the outline of the leading cam means (6).
  • swing arms are formed as double arm cranks (8, 9);
  • the adjustment means comprises a control rod (11) connected to one of said cranks, said control rod being shiftable in position in dependence on machine speed.
  • adjustment means comprises a control rod (11) connected to one of said cranks;
  • crank arms (10) is formed with limit means (17, 18) to limit the extent of movement thereof.
  • Apparatus according to claim 7 wherein said limit 11.
  • Apparatus according to claim 1 wherein the pivot means comprises apin engaging an elongated slot. point (12) of the trailing swing arm (8) and the pivot 9.
  • Apparatus according to claim 1 wherein the angle Point f the trailing cam means are axialf Swing of id Swing arms i about 40 12.
  • Apparatus according to claim 1 wherein the sion spring interconnecting the arms to counteract play shiftable track and the trailing cam means are formed m the swmg and Plvots Polms thereofas interdigited elements. :0:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Discharge By Other Means (AREA)
US171167A 1970-08-17 1971-08-12 Sheet feeding apparatus having gripper control, for use with printing machines Expired - Lifetime US3703281A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2040670 1970-08-17

Publications (1)

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DE (1) DE2040670B1 (enExample)
FR (1) FR2104290A5 (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643414A (en) * 1984-04-07 1987-02-17 Miller-Johannisberg Druckmaschinen Gmbh Sheet-delivery control and regulating apparatus
US5297788A (en) * 1992-03-23 1994-03-29 Heidelberger Druckmaschinen Ag Gripper control device in a chain delivery of a sheet-fed printing press
US20040231962A1 (en) * 2003-05-19 2004-11-25 Noll Harry C. Transfer device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD113510A1 (enExample) * 1974-08-29 1975-06-12
DD141664A1 (de) * 1979-03-15 1980-05-14 Hans Zimmermann Greifersteuerkurve in bogenauslegern von bogenverarbeitenden maschinen
DE4119188C1 (enExample) * 1991-06-11 1992-12-10 Koenig & Bauer Ag, 8700 Wuerzburg, De
DE4335230C2 (de) * 1993-10-15 1996-03-14 Heidelberger Druckmasch Ag Einstellvorrichtung für eine Greiferöffnungskurve in einem Kettenausleger einer Bogendruckmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE818365C (de) * 1949-12-13 1951-12-06 Faber & Schleicher A G Bogenablegevorrichtung an Druckmaschinen
US2836418A (en) * 1953-05-22 1958-05-27 Roland Offsetmaschf Stacking device for printing machines
US3109644A (en) * 1960-07-22 1963-11-05 Maschf Augsburg Nuernberg Ag Chain stacker gripper control
DE1219045B (de) * 1965-11-05 1966-06-16 Maschf Augsburg Nuernberg Ag Steuerung fuer die Greifer von Kettenauslegern an Druckmaschinen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE818365C (de) * 1949-12-13 1951-12-06 Faber & Schleicher A G Bogenablegevorrichtung an Druckmaschinen
US2836418A (en) * 1953-05-22 1958-05-27 Roland Offsetmaschf Stacking device for printing machines
US3109644A (en) * 1960-07-22 1963-11-05 Maschf Augsburg Nuernberg Ag Chain stacker gripper control
DE1219045B (de) * 1965-11-05 1966-06-16 Maschf Augsburg Nuernberg Ag Steuerung fuer die Greifer von Kettenauslegern an Druckmaschinen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643414A (en) * 1984-04-07 1987-02-17 Miller-Johannisberg Druckmaschinen Gmbh Sheet-delivery control and regulating apparatus
US5297788A (en) * 1992-03-23 1994-03-29 Heidelberger Druckmaschinen Ag Gripper control device in a chain delivery of a sheet-fed printing press
US20040231962A1 (en) * 2003-05-19 2004-11-25 Noll Harry C. Transfer device
US6851544B2 (en) 2003-05-19 2005-02-08 Graphic Management Associates, Inc. Transfer device

Also Published As

Publication number Publication date
DE2040670B1 (de) 1971-08-05
FR2104290A5 (enExample) 1972-04-14

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