US3438324A - Magnetic printing plate holddown means - Google Patents

Magnetic printing plate holddown means Download PDF

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Publication number
US3438324A
US3438324A US610176A US3438324DA US3438324A US 3438324 A US3438324 A US 3438324A US 610176 A US610176 A US 610176A US 3438324D A US3438324D A US 3438324DA US 3438324 A US3438324 A US 3438324A
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US
United States
Prior art keywords
cylinder
plate
printing plate
groove
magnetic
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
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US610176A
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English (en)
Inventor
Ross C Meade
Charles J Sanders
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.)
Paper Converting Machine Co
Original Assignee
Paper Converting Machine Co
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 Paper Converting Machine Co filed Critical Paper Converting Machine Co
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Publication of US3438324A publication Critical patent/US3438324A/en
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    • 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
    • B41F27/02—Magnetic devices

Definitions

  • FIG. 1 is an elevational view, partially in section, of a plate cylinder equipped with a printing plate according to the teachings of this invention
  • FIG. 2 is an enlarged fragmentary sectional view taken along the line 2-2 of FIG. 1;-
  • FIG. 3 is a view similar to FIG. 2 but showing the printing plate in an intermediate stage of installation.
  • FIG. 4 is an enlarged fragmentary sectional view of an auxiliary cylinder employed in the practice of the invention.
  • the plate cylinder seen in FIG. 1 is generally designated by the numeral and is intended for rotatable mounting in a printing press (not shown).
  • the cylinder 10 is equipped With journals as at 11.
  • the cylinder 10 includes an elongated shaft portion 12 integral with the journals 11 and mounted on the shaft 12 are a plurality of magnetic discs 13.
  • Each magnetic disc 13 is separated from an adjoining disc by means of a non-magnetic separator as at 14.
  • the polar arrangement of the magnetic discs 13 is such as to have like poles adjacent each other in adjacent discs.
  • the magnetic discs 13 and the magnet separators 14 are all maintained in the position seen in FIG. 1 by virtue of lock nuts 11a mounted on the ends of the shaft 12.
  • a segment of a magnetic disc 13 is seen to be equipped with a longitudinally or axially extending groove generally designated 14.
  • the groove receives the ends 15a and 15b of printing plate 15 (the printing plate being designated in FIG. 1). Clamping the ends of the printing plate within the recess 14 is a retainer bar generally designated 16.
  • the retainer bar 16 is equipped with a radially inwardly extending tongue portion 17 (radially relative to the disc 13).
  • the tongue portion 17 is seen to be received in a mating or conforming portion 18 provided as part of the groove 14.
  • the groove 14 is equipped with sloping surfaces as at 19 which are angled outwardly at an angle in the illustration given 76 45 relative to a radial line from the axis of the cylinder 13 to the center of the bar 16. We find that angles of the order of about to about are especially suited for this purpose.
  • the bar 16 is equipped with winged portions as at 20 which extend laterally from the tongue portion 17 and which coact with the surfaces 19 in clamping the ends 15a and 15b in an immobile fashion.
  • the undersides (as pictured) of the wings 20 as at 20a in FIG. 2, are sloped similar to the surfaces 19.
  • the width of the tongue portion is about 0.125" and the depth of the conforming groove portion 18 (relative t0 the cylindrical surface of the cylinder 13) is about 0.065.
  • the overall width of the groove 14 is 0.313" and the bar 16 has a width of 0.250" to provide wings 20 having widths of the order of 0.065".
  • auxiliary cylinder 21 is of the same diameter as the plate cylinder 13 but difiers therefrom in having a slot or groove 22 which is approximately 4 less in width than the master cylinder 13.
  • the plate 15 before installation on the auxiliary cylinder 21 is advantageously passed through a roll former (a steel and rubber roll combination) to provide an initial curvature to the steel-backed plate 15. With this initial curvature, the plate 15 is installed on the auxiliary cylinder 21 and the leading and trailing edges of the plate 15 are deformed as at 23. This is advantageously achieved through the operation of a resilient materialfaced bar 24.
  • the bar or press may include a steel element 25 which is equipped with a surface confronting the groove 22 constructed of rubber, solid urethane (70 to durometer A scale) or the like as at 26.
  • the groove 22 in the auxiliary cylinder 21 is somewhat less than the corresponding groove 14 in the master cylinder 13 to insure that the crease lines on the steelbacked plate will project beyond the edge of the slot or groove 14 when the plate 15 is installed on the master cylinder 13.
  • the auxiliary cylinder 21 is not as elaborate as the master cylinder 13, lacking the journals, etc., present in an operational cylinder.
  • the guide member 27 has a tongue portion 28 contoured to fit within the recessed portion 18 and above the tongue portion, the guide member 27 has a block portion as at 29.
  • the block portion has a Width of and this provides side surfaces as at 30 which are used to establish a straight edge transversely across the cylinder.
  • the plate 15 to be mounted is butted against this guide, and as the roll is rotated, the plate will be drawn against the cylinder.
  • the guide member 27 is removed. This then establishes the printing plate 15 in a predetermined position on the cylinder 13. Thereafter, the retainer bar 16 is mounted as seen in FIG. 2 and this achieves the advantageous clamping action.
  • a printing press equipped with a rotatably mounted plate cylinder having a plurality of axially-spaced magnetic discs for attaching a metal-backed printing plate in conforming relation to the cylinder surface, an axially-extending groove in said cylinder surface, a plate wrapped on said cylinder with straight side edge portions disposed in spaced apart relation in said groove, and an elongated paramagnetic metal bar removably mounted in said groove between said edge portions and adjacent to said discs and equipped with laterally-extending integral wings overlying said edge portions whereby the edge portions are held immobile in said groove by the magnetic force applied to said bar.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Printing Plates And Materials Therefor (AREA)
US610176A 1967-01-18 1967-01-18 Magnetic printing plate holddown means Expired - Lifetime US3438324A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US61017667A 1967-01-18 1967-01-18

Publications (1)

Publication Number Publication Date
US3438324A true US3438324A (en) 1969-04-15

Family

ID=24443997

Family Applications (1)

Application Number Title Priority Date Filing Date
US610176A Expired - Lifetime US3438324A (en) 1967-01-18 1967-01-18 Magnetic printing plate holddown means

Country Status (6)

Country Link
US (1) US3438324A (de)
AT (1) AT289855B (de)
BE (1) BE698206A (de)
DE (1) DE1611257B1 (de)
GB (1) GB1132196A (de)
SE (1) SE335542B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624731A (en) * 1969-07-16 1971-11-30 Denver Post Inc The Printing apparatus and process for controlling ink fog
US3721189A (en) * 1971-06-28 1973-03-20 Magna Graphics Corp Magnetic print cylinder
US3742852A (en) * 1971-10-01 1973-07-03 Dayco Corp Magnetic printing cylinder
US3919937A (en) * 1974-03-15 1975-11-18 Donnelley & Sons Co Magnetic cylinder for printing presses
US4357093A (en) * 1980-12-18 1982-11-02 International Business Machines Corporation Photoconductor tensioning device
US4587900A (en) * 1984-10-29 1986-05-13 Riso Kagaku Corporation Master retaining device for a printing machine
US4831930A (en) * 1988-02-01 1989-05-23 Integrated Design Corp. Magnetic cylinder
US20030183102A1 (en) * 2002-04-01 2003-10-02 Presstek, Inc. Magnetic plate-retention system
US6729235B2 (en) 2001-04-30 2004-05-04 Eastman Kodak Company Imaging apparatus and imaging drum having material clamp
US20100089261A1 (en) * 2007-02-15 2010-04-15 Kba-Giori S.A. Method and Apparatus for Forming an Ink Pattern Exhibiting a Two-Dimensional Ink Gradient

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20218308U1 (de) 2002-11-20 2003-01-23 Kocher + Beck Gmbh + Co. Rotationsstanztechnik Kg, 72124 Pliezhausen Magnetzylinder

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1614801A (en) * 1925-05-06 1927-01-18 August F Osterlind Type cylinder for rotary presses
US2190380A (en) * 1937-06-02 1940-02-13 Hoe & Co R Plate clamping mechanism
US2517701A (en) * 1947-05-03 1950-08-08 Electrographic Corp Plate curving process
US3097598A (en) * 1961-12-11 1963-07-16 Deutsche Edelstahlwerke Ag Printing cylinder
US3126825A (en) * 1964-03-31 Plate cylinder for wrap-around printing plate and method
US3217645A (en) * 1962-12-31 1965-11-16 Nat Steel Corp Magnetic securing means for flexible printing plates

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE640262C (de) * 1934-12-14 1936-12-29 E H Wilhelm Stein Dr Ing Vorrichtung zum Aufspannen von biegsamen Druckformen auf dem Formzylinder von Rotationsdruckmaschinen
US2775199A (en) * 1953-02-24 1956-12-25 M B Claff & Sons Inc Flexible printing plate locking device
GB918276A (en) * 1959-10-27 1963-02-13 Timsons Ltd Improvements relating to printing cylinders
DE1130828B (de) * 1960-03-24 1962-06-07 Deutsche Edelstahlwerke Ag Druckformzylinder
BE657332A (de) * 1964-12-18 1965-04-16

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126825A (en) * 1964-03-31 Plate cylinder for wrap-around printing plate and method
US1614801A (en) * 1925-05-06 1927-01-18 August F Osterlind Type cylinder for rotary presses
US2190380A (en) * 1937-06-02 1940-02-13 Hoe & Co R Plate clamping mechanism
US2517701A (en) * 1947-05-03 1950-08-08 Electrographic Corp Plate curving process
US3097598A (en) * 1961-12-11 1963-07-16 Deutsche Edelstahlwerke Ag Printing cylinder
US3217645A (en) * 1962-12-31 1965-11-16 Nat Steel Corp Magnetic securing means for flexible printing plates

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624731A (en) * 1969-07-16 1971-11-30 Denver Post Inc The Printing apparatus and process for controlling ink fog
US3721189A (en) * 1971-06-28 1973-03-20 Magna Graphics Corp Magnetic print cylinder
US3742852A (en) * 1971-10-01 1973-07-03 Dayco Corp Magnetic printing cylinder
US3919937A (en) * 1974-03-15 1975-11-18 Donnelley & Sons Co Magnetic cylinder for printing presses
US4357093A (en) * 1980-12-18 1982-11-02 International Business Machines Corporation Photoconductor tensioning device
US4587900A (en) * 1984-10-29 1986-05-13 Riso Kagaku Corporation Master retaining device for a printing machine
US4831930A (en) * 1988-02-01 1989-05-23 Integrated Design Corp. Magnetic cylinder
US6729235B2 (en) 2001-04-30 2004-05-04 Eastman Kodak Company Imaging apparatus and imaging drum having material clamp
US20030183102A1 (en) * 2002-04-01 2003-10-02 Presstek, Inc. Magnetic plate-retention system
US6688227B2 (en) * 2002-04-01 2004-02-10 Presstek, Inc. Magnetic plate-retention system and method of securing recording medium to rotatable support
US20100089261A1 (en) * 2007-02-15 2010-04-15 Kba-Giori S.A. Method and Apparatus for Forming an Ink Pattern Exhibiting a Two-Dimensional Ink Gradient
US8499690B2 (en) * 2007-02-15 2013-08-06 Kba-Notasys Sa Method and apparatus for forming an ink pattern exhibiting a two-dimensional ink gradient

Also Published As

Publication number Publication date
DE1611257B1 (de) 1971-10-21
AT289855B (de) 1971-05-10
GB1132196A (en) 1968-10-30
SE335542B (de) 1971-06-01
BE698206A (de) 1967-10-16

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