US3190645A - Sheet-feeding device for printing presses - Google Patents

Sheet-feeding device for printing presses Download PDF

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Publication number
US3190645A
US3190645A US164106A US16410662A US3190645A US 3190645 A US3190645 A US 3190645A US 164106 A US164106 A US 164106A US 16410662 A US16410662 A US 16410662A US 3190645 A US3190645 A US 3190645A
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United States
Prior art keywords
grippers
feed table
sheet
swinging
impression cylinder
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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
US164106A
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English (en)
Inventor
Reinartz Robert
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
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Filing date
Publication date
Application filed by MAN Maschinenfabrik Augsburg Nuernberg AG filed Critical MAN Maschinenfabrik Augsburg Nuernberg AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/04—Grippers
    • B41F21/05—In-feed grippers

Definitions

  • This invention relates to feeding devices for feeding single sheets of paper to be printed toward the impression cylinder of printing presses, and, more particularly to such devices wherein the pre-grippers for carrying each sheet of paper from the feed table to the impression cylinder are mounted below the sheets of paper and the feed table and must be adjusted with respect to the impression cylinder for different thicknesses of sheets being fed thereto.
  • sheets of paper or other material to be printed by sheet-fed printing presses are supplied to a feed table and then fed singly toward the rotating impression cylinder so that the leading edge of the sheet is gripped by the sheet grippers on the impression cylinder and the sheet thus carried around the cylinder to receive the printing impression.
  • pre-gripping devices which swing back and forth between the feed table and the impression cylinder to grip the leading edge of the sheet at the feed table and carry it to the impression cylinder where it can be gripped by the sheet grippers 0n the cylinder, and a wide variety of such pre-gripper devices or arrangements is known.
  • the spacing relationship of the swinging pre-gripper and the feed table remains constant regardless of the thickness of the sheet to be gripped, whereas the spacing of the extreme end of the gripper with respect to the surface of the impression cylinder must be variable in accordance with the thickness of the sheet being fed in order for the pro-gripper to lay the sheet correctly against ice the impression cylinder to be engaged by the sheet grippers of the cylinder.
  • a simple and dependable arrangement in accordance herewith, which is easily and inexpensively manufactured and included in the design of an offset printing press, includes the provision of coacting eccentric bearings or mountings for the pivotal axis of the swinging pre-grippers for adjustment thereof to provide independently the desired different swinging paths for each stroke as well as to adjust the spacing of the pre-gripper with respect to the impression cylinder without also varying the positioning of the pre'gripper with respect to the feed table at each extreme of the pre-gripper swinging strokes.
  • FIG. 1 is a partial view of a printing press including an arrangement embodying and for practicing this invention, partly in section along the line II of FIG. 2 but with some of the printing press members omitted for clarity;
  • FIG. 2 is a partial top plan view of the arrangement of FIG. 1 at one side of the printing press.
  • FIG. 3 is a diagrammatic view indicating some of the different positions and movements of some parts of the arrangement of FIG. 1.
  • impression cylinder of an offset printing press is indicated at 10 as supported on a shaft 11 mounted for rotation in journals 12 in one side frame member 13 of the printing press.
  • Adjacent impression cylinder 10 is indicated a conventional feed table arrangement 15 to which sheets of paper or other material to be printed are conveyedas by a belt conveyor roller 16 operating in a cut-out 17 for sliding sheetsindividually over fingers s3 18 (which may be raised as a fence upon rotation of shaft 19) all in known manner.
  • a plurality of pre-grippers 20 each of known construction, is arranged for swinging movement back and forth between the left-hand edge of table 15 and impression cylinder 10, as indicated by the dot-dash line showings of various positions of pre-grippers 20 in FIG. 1 and, more diagrammatically, in FIG. 3.
  • pregrippers 20 pick up the leading or left-hand edge of a sheet from table 15 and draw it to the left in the drawings over to the surface of impression cylinder 19, where the leading edge of the sheet can be engaged by conventional sheet grippers on cylinder 10.
  • the pre-grippers 20 are mounted on swinging gripper bar 25 supported between arms 26 extending from a rotatable gripper shaft 27 (and affixed thereto as by collars 29), which shaft is mounted across the printing press between opposite side frame members 13, whereby a swinging motion is imparted to gripper bar 25 and pre-grippers 20 thereon upon rotation of gripper shaft 27.
  • pre-grippers 2i) (or, particularly, the gripping extremities 28 thereof) follow a swinging path in moving from table 15 toward cylinder 19 different from the paths followed in the return trip to table 15 in order that the grippers 20 or tips 28 thereof will return from cylinder to table beneath the sheet of paper being drawn off table 15 by the sheet grippers on cylinder 19.
  • FIG. 3 where, for clarity, several different positions of the gripping ends 28 of pregrippers have been diagrammed as superimposed with dot-dash lines to indicate the center-lines of arms 26 (shown as connecting the axes of shafts and 27) and of pre-grippers 20 in the several positions shown.
  • the gripping tips 28 of pre-grippers 20 follow a swinging path indicated by the solid line 30 in moving from table 15 to cylinder 10, but follow the different path indicated by solid line 31 in the return trip to table 15, in order, as will be understood, to carry the leading edge of a sheet from table 15 directly against cylinder 10 for engagement with the sheet grippers thereon and then to return to table 15 without interfering with the smooth and continued drawing of the sheet off table 15 as cylinder 10 continues to rotate in the direction indicated.
  • gripper shaft 27 instead of being rotated or oscillated merely about its own axis, is mounted in side frame members 13 in eccentric bushings 35 in such manner that, as will be understood, rotation of eccentric bushing 35 cyclically during rotary movement of shaft 27 displaces the axis of gripper shaft 27 to achieve the desired complex motion and paths of movement of pro-grippers 20. More specifically, intermittent and oscillating rotary or angular movement is imparted to gripper shaft 27 in known manner as by a reciprocating linkage 38 connected to an eccentric arm 39 mounted at one end of gripper shaft 27 to oscillate shaft 27 angularly back and forth about its own axis.
  • gripper shaft 27 is supported by eccentric bushings 35 which are also rotating, however, the cyclic displacements of the axis of gripper shaft 27 at various angular positions of rotating eccentric bushings 35, combine with the angular oscillations of shaft 27 about its own axis, provide the desired swinging movements of pre-grippers 21 on gripper bar 25 at the ends of swinging arms 26 on gripper shaft 27, so that the tips 28 of pre-grippers 2%) follow the path as indicated by lines 30 and 31 in FIG. 3.
  • pre-grippers 2%) for adjustment thereof with respect to impression cylinder 10 in order to accommodate or compensate for different thicknesses of the sheets or other material to be printed and fed from table 15 to the sheet grippers on cylinder 10. That is, it is desired for pro-grippers 29 to carry the leading edge of a sheet from table 15 directly against the surface of impression cylinder 10 for engagement with the sheet grippers thereon.
  • pie-grippers 20 should travel closer to the surface of cylinder 10 when the sheet is very thin than when very thick paper is being fed. Nevertheless, a similar adjustment of pre-grippers 20 with respect to the top surface of table 15 is neither necessary nor desired regardless of varying thicknesses of the sheets being fed.
  • means are provided for changing or adjusting the positioning or spacing of pre-grippers 20 with respect to impression cylinder 10, but without altering the positioning of pre-grippers 20 vertically with respect to the top surface of table 15, and all notwithstanding the continuously rotary nature of the movement of eccentric bushings 35 and the cyclic displacement of the axis of shaft 27 achieved thereby.
  • such means include eccentric bushings 45 within which eccentric bushings 35 and gripper shaft 27 are mounted for rotation in side frame members 13. As will be apparent, rotation of eccentric bushings 45 displaces the axes of both eccentric bushings 35 and gripper shaft 27, depending upon the particular degree of eccentricity of bushings 45 and the angular positioning thereof.
  • eccentric bushings 45 The angular positioning of eccentric bushings 45 is controlled or adjusted by depending arms 46 and rods 47 pivotally connected to arms 46 as at 48.
  • the opposite end of rod 47 is connected to frame member 13 through conventional setting or adjusting mechanism indicated at 50 for adjusting and maintaining the horizontal positioning of rod 47 and arm 46 in any of a plurality of positions (as indicated by solid line and dot-dash line showings of FIG. 1).
  • eccentric bushings 45 are adjusted and maintained in any of a plurality of angular positions each of which adjusts and maintains the axes of eccentric bushings 35 and shaft 27 in different displaced relationships with respect to impression cylinder 10.
  • eccentric bushings 45 As noted more particularly in FIG. 3, maintaining one angular positioning of eccentric bushings 45 provides for paths of travel of tips 28 of pre-grippers 20 along the lines 30 and 31, as previously noted, during the continuous and cooperating motions of eccentric bushings 35 and oscillating gripper shaft 27. Maintaining eccentric bushings 45 in a different angular position (omitted for simplicity in the drawing) provides for causing tips 28 of pre-grippers 20 to follow different paths (indicated by the dot-dash lines 55 and 56) during the same motions of eccentric bushings 35 and gripper shaft 27.
  • the actual operation of the gripping tips 28 of pre-grippers 20 providing for gripping the edge of a sheet on table 15 and then releasing the sheet as it is gripped by sheet grippers on impression cylinder is provided by conventional or well understood means, and is satisfactorily controlled as by a cam-actuated arm 59 at one end of gripper bar 25 acti vated by a cam surface (not shown) in known manner.
  • a printing press sheet-feeding mechanism of the character described for feeding individual sheets of paper to be printed from a feed table to an impression cylinder for engagement with sheet grippers thereon
  • the combination which comprises swinging pre-gripper means for gripping an edge of a sheet paper on said feed table at one edge thereof and leading it to the surface of said impression cylinder for engagement with said grippers thereon, means for mounting said pre-grippers below said feed table for swinging movement back and forth between said edge of said feed table and said impression cylinder and on an angularly oscillating shaft for effecting said swinging movement, eccentric bushings for mounting said shaft in said printing press for intermittent displacement of the axis of said shaft upon rotation of said eccentric bushings for altering the path of said swinging movement of said pre-grippers back and forth between said feed table and said impression cylinder during said angular oscillation of said shaft, and additional eccentric bushings for mounting both said shaft and said first mentioned eccentric bushings in said press for displacement of the axes thereof for adjusting the spacing horizontal between said pre-gri

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US164106A 1961-01-28 1962-01-03 Sheet-feeding device for printing presses Expired - Lifetime US3190645A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM47832A DE1126411B (de) 1961-01-28 1961-01-28 Bogenanlegevorrichtung

Publications (1)

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US3190645A true US3190645A (en) 1965-06-22

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ID=7306037

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Application Number Title Priority Date Filing Date
US164106A Expired - Lifetime US3190645A (en) 1961-01-28 1962-01-03 Sheet-feeding device for printing presses

Country Status (4)

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US (1) US3190645A (de)
CH (1) CH400195A (de)
DE (1) DE1126411B (de)
GB (1) GB923605A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420169A (en) * 1966-07-29 1969-01-07 Addressograph Multigraph Master handling means for duplicating machines
FR2637224A1 (fr) * 1988-10-04 1990-04-06 Heidelberger Druckmasch Ag Dispositif de transfert de feuilles pour presse a imprimer
US5390908A (en) * 1992-07-01 1995-02-21 Heidelberger Druckmaschinen Ag Device and method for detecting and gripping sheets
EP0972638A1 (de) * 1998-07-16 2000-01-19 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Zuführen von Bogen zu einer Bogen verarbeitenden Maschine
JP2007161486A (ja) * 2005-12-09 2007-06-28 Man Roland Druckmas Ag 枚葉紙加工機のくわえ用の伝動機構

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1208309B (de) * 1965-02-08 1966-01-05 Planeta Veb Druckmasch Werke Schwinganlage fuer Druckmaschinen
DD142694A1 (de) * 1979-04-02 1980-07-09 Guenter Weisbach Bogenrotationsdruckmaschine mit einem von unten arbeitenden vorgreifer
DE10218204A1 (de) * 2002-04-24 2003-11-06 Koenig & Bauer Ag Vorgreifer mit einem Greifersytem
DE10218172A1 (de) * 2002-04-24 2003-11-13 Koenig & Bauer Ag Antrieb eines Vorgreifers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1867859A (en) * 1929-02-28 1932-07-19 Samuel J Mollet Printing press
US2220046A (en) * 1938-12-10 1940-10-29 Lang Karl Theodor Sheet feeding device
DE749473C (de) * 1940-11-29 1945-01-11 Roland Offsetmaschf Bogenanlege- und Zufuehrvorrichtung fuer Druckmaschinen
US2642282A (en) * 1948-11-12 1953-06-16 Backhouse Headley Townsend Mechanism for feeding sheets to rotary drum machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1867859A (en) * 1929-02-28 1932-07-19 Samuel J Mollet Printing press
US2220046A (en) * 1938-12-10 1940-10-29 Lang Karl Theodor Sheet feeding device
DE749473C (de) * 1940-11-29 1945-01-11 Roland Offsetmaschf Bogenanlege- und Zufuehrvorrichtung fuer Druckmaschinen
US2642282A (en) * 1948-11-12 1953-06-16 Backhouse Headley Townsend Mechanism for feeding sheets to rotary drum machines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420169A (en) * 1966-07-29 1969-01-07 Addressograph Multigraph Master handling means for duplicating machines
FR2637224A1 (fr) * 1988-10-04 1990-04-06 Heidelberger Druckmasch Ag Dispositif de transfert de feuilles pour presse a imprimer
US5390908A (en) * 1992-07-01 1995-02-21 Heidelberger Druckmaschinen Ag Device and method for detecting and gripping sheets
EP0972638A1 (de) * 1998-07-16 2000-01-19 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Zuführen von Bogen zu einer Bogen verarbeitenden Maschine
US6349935B1 (en) 1998-07-16 2002-02-26 Heidelberger Druckmaschinen Ag Device for feeding sheets to a sheet-processing machine
JP2007161486A (ja) * 2005-12-09 2007-06-28 Man Roland Druckmas Ag 枚葉紙加工機のくわえ用の伝動機構

Also Published As

Publication number Publication date
DE1126411B (de) 1962-03-29
CH400195A (de) 1965-10-15
GB923605A (en) 1963-04-18

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