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US3393638A - Device for securing a flexible printing plate to a cylinder of a rotary printing press - Google Patents

Device for securing a flexible printing plate to a cylinder of a rotary printing press Download PDF

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Publication number
US3393638A
US3393638A US582360A US58236066A US3393638A US 3393638 A US3393638 A US 3393638A US 582360 A US582360 A US 582360A US 58236066 A US58236066 A US 58236066A US 3393638 A US3393638 A US 3393638A
Authority
US
United States
Prior art keywords
printing plate
cylinder
printing
clamping
securing
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
US582360A
Other languages
English (en)
Inventor
Bohm Josef
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.)
Schnellpressenfabrik Koenig and Bauer AG
Original Assignee
Schnellpressenfabrik Koenig and Bauer 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 Schnellpressenfabrik Koenig and Bauer AG filed Critical Schnellpressenfabrik Koenig and Bauer AG
Application granted granted Critical
Publication of US3393638A publication Critical patent/US3393638A/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
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/1225—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly
    • B41F27/1243—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly by pivotal or swivelling motion, e.g. by means of a rocking lever

Definitions

  • ABSTRACT OF THE DISCLOSURE A device for securing a flexible printing plate to a printing cylinder and for adjusting this plate so as to be in tangential register with an adjacent printing plate, wherein this plate encompasses the entire printing cylinder with the exception of a very narrow gap on which no printing can be carried out and its ends are provided with straight arms which are formed by the bent-over ends of the plate and these arms are gripped by a pair of clamping jaws and are held in a fixed position thereon by an intermediate resilient strip, and wherein these jaws may by very simple mechanical means be either drawn toward each other so as to tighten the printing plate on the cylinder or both jaws together with the arms may be shifted in one peripheral direction or the other on the cylinder by tightening one jaw and releasing the other jaw so as to shift the entire printing plate along the peripheral surface of the cylinder until it is in exact register with the adjacent printing plate.
  • the present invention relates to a device for securing a flexible printing plate to a printing cylinder of a rotary printing press.
  • the invention provides that the ends of the flexible printing plate only need to be bent over once and that a cord or the like of an elastic material is inserted between these ends which extends substantially parallel to the axis of the printing cylinder and presses the arms formed 'by the bent-over ends firmly against the clamping jaws which are preferably provided with roughened or serrated gripping surfaces. Since the ends of the printing plate are bent over only once, this plate may be easily installed on and removed from the printing cylinder and easily adjusted in register in the tangential direction relative to an associated printing plate.
  • one of the clamping jaws is tightened, while the other jaw is released so that both arms of the printing plate together with the printing plate itself are shifted in one or the opposite peripheral direction on the the printing cylinder. Since the bent-over ends of the printing plate are only separated by an elastic cord or the like, the gap remaining between these ends on which no printing can be carried out is very narrow.
  • the clamping device comprises a pair of clamping jaws 3 and 4 which are provided with opposite clamping surfaces 7 and 8 and are disposed within an axially extending recess 1 of the printing cylinder 2 and are ivotally mounted on a pair of shafts 5 and 6 which extend parallel to the axis of cylinder 2 and are mounted on end discs, not shown, on both ends of the printing cylinder.
  • a cord 12 or the like of an elastic material is inserted which extends along the entire width of the printing plate 11 and presses these ends resiliently against the clamping surfaces 7 and 8 of the clamping jaws 3 and 4.
  • a setscrew 17 is adapted to act upon the end of lever 18 carrying the clamping jaw 3 so as to pivot the same about the axis of shaft 5, while the other lever 15 carrying the clamping jaw 4 and pivotable about the axis of shaft 6 is acted upon by a spring-loaded plunger 16 which acts upon the lever 15.
  • an eccentric 14 may be turned about a shaft 13 so as to act upon the lever 15 on shaft 6 and thus upon the clamping jaw 4.
  • the tangentail register between the printing plate 11 and the associated printing plate, not shown, may be adjusted by setscrew 7.
  • setscrew 7 When this setscrew is turned so as to apply upon lever a force in excess of the spring force of plunger 16 acting upon lever 15, the pivoting movement of lever 18 and jaw 3 will be transmitted through the bent over ends or the arms 9 and 10 on the printing plate and the intermediate elastic strip 12 to jaw 4 and lever 15 against the action of the spring-load plunger 16 with the result that both ends 9 and 10 on the printing plate will be shifted in the same direction and printing plate 11 will be shifted peripherally in one direction along cylinder 2.
  • the reverse movement of printing plate 11 on cylinder 2 will occur when setscrew 17 is released so as to exert a smaller pressure upon lever 18 than that whichisexerted' by plunger 16 upon the other level: 1.5. i 1 was. v
  • the eccentric 14 on shaft 13 acting on lever 15 which is biased by the spring loaded plunger 16 and the setscrew v17,ac ting on lever 18 may be termed the mechanical means that act upon the-levers 15 and 18, respectively.
  • the sides of the clamping jaws' 3 and 4 facing each other are provided underneath the clamping surfaces? and 8. with toothlikeprojections 19 on each clamping jaw which engage in-to corresponding recesses in the other jaw and prevent, the elastic cord 12 from falling into the, recess 1 when theclamping jaws are released, and the clamping surfaces 7 and 8 of jaws 3 and 4 are provided with serrations or the liketo insure-a firm grip on the'bentover ends 9 and 10 of printing plate 11.
  • a device for securing a flexible printing plate to a printing cylinder of a rotary printing press comprising a pair of clamping jaws disposed within a recess in said cylinder, means on said cylinder in operative engagement with said clamping jaws for pivoting said clamping jaws relative to each other about axis extending parallel to the axis of said cylinder, each of said clamping jaws having a clamping surface facing that of the other clamping jaw, said printing plate having bent-over ends form ing straight arms extending along substantially the entire width of said printing plate and engaging into said recess between said clamping surfaces, the corners between said plate .and said straight armsbeing adapted when said clamping jaws are tightened to be separated from each other by a narrow gap, a strip of elastic material inserted between and adapted to press against said straight arms so as to hold the same in a fixed position on said jaws and extending substantially along the en-tirewidth of s'aid straight arms, and mechanical means

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
US582360A 1965-10-02 1966-09-27 Device for securing a flexible printing plate to a cylinder of a rotary printing press Expired - Lifetime US3393638A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1965SC037811 DE1265164C2 (de) 1965-10-02 1965-10-02 Vorrichtung zum Befestigen von biegsamen Druckplatten auf Formzylindern von Rotationsdruckmaschinen

Publications (1)

Publication Number Publication Date
US3393638A true US3393638A (en) 1968-07-23

Family

ID=7434455

Family Applications (1)

Application Number Title Priority Date Filing Date
US582360A Expired - Lifetime US3393638A (en) 1965-10-02 1966-09-27 Device for securing a flexible printing plate to a cylinder of a rotary printing press

Country Status (3)

Country Link
US (1) US3393638A (de)
DE (1) DE1265164C2 (de)
GB (1) GB1150332A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5553544A (en) * 1995-04-12 1996-09-10 Heidelberg Harns Inc. Plate cylinder

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1761840B1 (de) * 1968-07-12 1971-05-06 Maschf Augsburg Nuernberg Ag Vorrichtung zum aufspannen von biegsamen druckplatten auf formzylindern von rotationsdruckmaschinen
DE4222407C1 (de) * 1992-07-08 1993-10-07 Max Planck Gesellschaft Modulartiges Promotor-Konstrukt

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2088862A (en) * 1935-06-15 1937-08-03 Lang Karl Theodor Printing machine
US2101173A (en) * 1936-08-26 1937-12-07 Willard Mfg Corp Plate clamp
US3043219A (en) * 1957-12-07 1962-07-10 Maschf Augsburg Nuernberg Ag Printing press machinery
US3058417A (en) * 1959-05-22 1962-10-16 Nils H V Norlin Mechanism for clamping plates to the cylinders of printing machines

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE179918C (de) *
DE424222C (de) * 1924-06-13 1926-01-20 Maschf Augsburg Nuernberg Ag Vorrichtung zum Aufspannen von Druckplatten auf den Plattenzylinder von lithographischen Druckmaschinen
US2056205A (en) * 1932-11-16 1936-10-06 American Can Co Clamping device
US2578406A (en) * 1948-05-15 1951-12-11 Time Inc Blanket clamp for blanket cylinders of printing presses
US2708407A (en) * 1949-07-01 1955-05-17 Hoe & Co R Printing plates and plate clamping mechanism therefor
US2768578A (en) * 1953-10-08 1956-10-30 Tribune Company Lock-up mechanism for dry offset printing plates
GB807021A (en) * 1955-07-01 1959-01-07 Kenneth Warner Jones And Compa Improvements in rotary printing and duplicating machines
US3107609A (en) * 1961-05-04 1963-10-22 Emric G Haramija Mechanism for holding and tensioning a printing plate on a printing cylinder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2088862A (en) * 1935-06-15 1937-08-03 Lang Karl Theodor Printing machine
US2101173A (en) * 1936-08-26 1937-12-07 Willard Mfg Corp Plate clamp
US3043219A (en) * 1957-12-07 1962-07-10 Maschf Augsburg Nuernberg Ag Printing press machinery
US3058417A (en) * 1959-05-22 1962-10-16 Nils H V Norlin Mechanism for clamping plates to the cylinders of printing machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5553544A (en) * 1995-04-12 1996-09-10 Heidelberg Harns Inc. Plate cylinder

Also Published As

Publication number Publication date
DE1265164B (de) 1968-04-04
DE1265164C2 (de) 1968-11-21
GB1150332A (en) 1969-04-30

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