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US2933040A - Sheet gripper element - Google Patents

Sheet gripper element Download PDF

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Publication number
US2933040A
US2933040A US781802A US78180258A US2933040A US 2933040 A US2933040 A US 2933040A US 781802 A US781802 A US 781802A US 78180258 A US78180258 A US 78180258A US 2933040 A US2933040 A US 2933040A
Authority
US
United States
Prior art keywords
sheet
peaks
gripper
post
gripping
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
US781802A
Other languages
English (en)
Inventor
Richard W Helmig
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.)
Harris Corp
Original Assignee
Harris Intertype Corp
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 Harris Intertype Corp filed Critical Harris Intertype Corp
Priority to US781802A priority Critical patent/US2933040A/en
Priority to GB42168/59A priority patent/GB897562A/en
Priority to DE19591411126 priority patent/DE1411126B1/de
Priority to CH8202559A priority patent/CH363040A/fr
Application granted granted Critical
Publication of US2933040A publication Critical patent/US2933040A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B41F21/10—Combinations of transfer drums and grippers
    • B41F21/104—Gripper details

Definitions

  • This invention relates generally to Sheet gripping devices adapted for use in a multicolor Sheet fed printing press, and in particular to a gripper post or other Sheet gripping. element having a gripping surface capable of positively grasping and holding a Sheet during passage through the press.
  • lt is therefore the principal object of 'this invention to provide accuracy of registration of print between the several units or colors of a multicolor Sheet fed printing press.
  • a more specific object of the invention is to eliminate or minimize the relative movement between a Sheet and the Sheet gripping members during travel of the' Sheet through a printing press.
  • the gripper posts with which the customary sheet gripping fingers on a printing press cylinder cooperate are etched to provide the posts with a multiplicity of minute peaks having relatively coplanar tops.
  • the peaks of the post positively grip the Sheet and prevent displacement of the Sheet relative to the gripping members while the Sheet is undergoing the printing process.
  • Fig. 1 is an elevational sectional view of a gripping finger and cooperating gripping post mounted on a portion of a cylinder of a printing press.
  • Fig. 2 is an enlarged fragmentary view of the gripper post of Fig. 1.
  • FIG. 3 is a view looking from above at the post of Fig. 2.
  • Fig. 4- is a greatly enlarged elevational sectional view of one of the peaks of the post.
  • Fig. 5 is a plan view of the top of the peak of Fig. 4.
  • a cylinder 16 which may be an impression cylinder of a rotary printing press, carries an oscillatable gripper Shaft 11.
  • the gripper shaft 11 carries along its length a plurality of gripper fingers 12 which cooperate with a similar plurality of fixed gripper posts 13, to grip a sheet S and assist in carrying it through the press
  • the posts 13 may be Secured to the cylinder by means of capscrews 14.
  • the gripper finger 12 has spaced sides each of which is Seated on a fianged bearing 15 journaled on the Shaft 11.
  • a gripper dog 16 is secured to the Shaft 11 between the sides of the finger 12 by means of a clamping Screw 17.
  • a compression spring 18 intermediate the finger and dog urges the gripper finger clockwise as viewed in Fig. l away from a seat 19 in the gripper dog 16, this clock- Wise movement being resisted when abutments 20 on the gripper finger and 21 on the dog engage at the time the gripper finger is out of contact with a Sheet.
  • the top surface of the gripper post 13 is provided with a multiplicity of peaks 22 having valleys between the peaks, and preferably is further provided with flat summits or plateaus 23 on the peaks. It will be noted that the plateaus 23 of the various peaks 22 are substantially planar and that the tops of the peaks provide a substantially level or planar surface for the post at the top thereof.
  • the manufacture of the top surface of the posts is Substantially the Same as that used in making halftone printing plates for many years.
  • the top of the post 13 is Originally flat, and is preferably coated with an etch resistant light Sensitive material capable of being harclened upon exposure to intense light.
  • a fine screen having areas of transparency which correspond only to the particular Size and number of peaks desired is placed over the posts having the coating thereon, and light is passed through the transparent areas.
  • the light Sensitive material is hardened upon exposure to the light and adheres to the top surface of the post 13.
  • the unhardened portions of the light Sensitive material are then washed off or otherwise removed and an etching material is applied to the surface of the post.
  • the hardened areas of the light Sensitive material are etch resistant, and therefore only the areas previously covered by the unhardened portions of the light Sensitive material are etched away into the stock of the gripper post 13.
  • the tops of the peaks may be ground after etching whenever it iS desired that the peaks 22 have coplanar plateaus which are accurately coplanar.
  • the posts are preferably hardened to minimize their wear due to abrasion from the Sheet stock and also from constant pounding of the gripper fingers.
  • the peaks need not necessarily be furnished with plateaus, even though the latter provide a desirable relatively level gripping surface.
  • the gripping surface may be produced on a thin plate and then cemented, brazed, or otherwise fastened to the main body of the post.
  • a sheet gripping device having a pair of relatively movable and cooperating gripping elements at least one of which has a hardened gripping surface comprising a multiplicity of minute peaks distributed throughout said gripping surface and having generally coplanar tops, and valleys surrounding the peaks, at least said one element being made by a process comprising the steps of coating the areas corresponding to the peak tops with an etch resistant material, and subjecting the uncoated areas to an etch to remove stock to a depth sufficient to form the valleys between the peaks,
  • a sheet gripper post adapted to cooperate with a relatively movable gripper fin'ger to grip sheets, said post having a hardened gripping surface comprising a multiplicity of peaks distributed throughout said surface and having minute relatively coplanar tops, and valleys surrounding the peaks, said post being made by a process comprising the steps of coating a surface of the post With a light Sensitive etch resistant material, exposing the areas corresponding to the tops to light to harden the coating in those areas, removing the unhardened areas of said coating, and subsequently subjecting the areas previously coveredrby the unhardened coating to an etch to remove stock to a depth suificient to form the valleys between the peaks.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
US781802A 1958-12-19 1958-12-19 Sheet gripper element Expired - Lifetime US2933040A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US781802A US2933040A (en) 1958-12-19 1958-12-19 Sheet gripper element
GB42168/59A GB897562A (en) 1958-12-19 1959-12-11 Sheet gripping device and method of making same
DE19591411126 DE1411126B1 (de) 1958-12-19 1959-12-15 Bogengreifvorrichtung,insbesondere fuer Druckpressen
CH8202559A CH363040A (fr) 1958-12-19 1959-12-18 Procédé pour rendre rugueuse la surface de préhension d'un élément de préhension de feuilles et élément de préhension obtenu selon ce procédé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US781802A US2933040A (en) 1958-12-19 1958-12-19 Sheet gripper element

Publications (1)

Publication Number Publication Date
US2933040A true US2933040A (en) 1960-04-19

Family

ID=25123985

Family Applications (1)

Application Number Title Priority Date Filing Date
US781802A Expired - Lifetime US2933040A (en) 1958-12-19 1958-12-19 Sheet gripper element

Country Status (4)

Country Link
US (1) US2933040A (de)
CH (1) CH363040A (de)
DE (1) DE1411126B1 (de)
GB (1) GB897562A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671706A (en) * 1970-09-21 1972-06-20 Harris Intertype Corp Sheet-gripper post formed by edm
DE3632768C1 (de) * 1986-09-26 1988-01-14 Roland Man Druckmasch Klemmgreifer fuer Bogenrotationsdruckmaschinen
US4781791A (en) * 1986-05-31 1988-11-01 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Process for producing structured retaining areas on sheet grippers and sheet gripper supports for sheet handling machines
US5024432A (en) * 1988-10-04 1991-06-18 Heidelberger Druckmaschinen Ag Sheet transfer device for a printing machine
DE4214191A1 (de) * 1992-04-30 1993-11-04 Roland Man Druckmasch Greifer fuer bogendruckmaschinen
DE4233421C1 (de) * 1992-04-30 1994-02-17 Roland Man Druckmasch Greifer für Bogendruckmaschinen

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443808A (en) * 1967-05-05 1969-05-13 Miller Printing Machinery Co Sheet gripper mechanism
DE3529596A1 (de) * 1985-08-19 1987-02-26 Roland Man Druckmasch Federnder greifer fuer bogenrotationsdruckmaschinen
DE102006018982A1 (de) * 2006-04-25 2007-10-31 Koenig & Bauer Aktiengesellschaft Klemmgreifer mit einer Haltefläche
DE102006018992B4 (de) * 2006-04-25 2017-12-14 Koenig & Bauer Ag Lagerkörper in Bogendruckmaschinen
DE102012222136A1 (de) 2012-12-04 2014-06-05 Koenig & Bauer Ag Greiferpaarung und Verfahren zur Herstellung von elastomerbeschichteten Bogenhalteflächen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1300610A (en) * 1917-08-08 1919-04-15 Miehle Printing Press & Mfg Gripper device.
US2257143A (en) * 1938-05-23 1941-09-30 Otis F Wood Reproduction process

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1300610A (en) * 1917-08-08 1919-04-15 Miehle Printing Press & Mfg Gripper device.
US2257143A (en) * 1938-05-23 1941-09-30 Otis F Wood Reproduction process

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671706A (en) * 1970-09-21 1972-06-20 Harris Intertype Corp Sheet-gripper post formed by edm
US4781791A (en) * 1986-05-31 1988-11-01 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Process for producing structured retaining areas on sheet grippers and sheet gripper supports for sheet handling machines
DE3632768C1 (de) * 1986-09-26 1988-01-14 Roland Man Druckmasch Klemmgreifer fuer Bogenrotationsdruckmaschinen
EP0261413A2 (de) * 1986-09-26 1988-03-30 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Klemmgreifer für Bogenrotationsdruckmaschinen
US4873926A (en) * 1986-09-26 1989-10-17 Man Poland Druckmaschinen Ag Clamping gripper with resultant force through contact point
EP0261413A3 (en) * 1986-09-26 1990-01-31 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Clamping gripper for sheet-fed rotary presses
US5024432A (en) * 1988-10-04 1991-06-18 Heidelberger Druckmaschinen Ag Sheet transfer device for a printing machine
DE4214191A1 (de) * 1992-04-30 1993-11-04 Roland Man Druckmasch Greifer fuer bogendruckmaschinen
DE4233421C1 (de) * 1992-04-30 1994-02-17 Roland Man Druckmasch Greifer für Bogendruckmaschinen

Also Published As

Publication number Publication date
DE1411126B1 (de) 1970-04-23
CH363040A (fr) 1962-07-15
GB897562A (en) 1962-05-30

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