US1396653A - Typographic printing-plate - Google Patents

Typographic printing-plate Download PDF

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Publication number
US1396653A
US1396653A US492488A US49248821A US1396653A US 1396653 A US1396653 A US 1396653A US 492488 A US492488 A US 492488A US 49248821 A US49248821 A US 49248821A US 1396653 A US1396653 A US 1396653A
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Prior art keywords
plate
cylinder
printing
grooves
typographic printing
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Expired - Lifetime
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US492488A
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Murray John
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Individual
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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
    • B41F27/04—Devices for attaching printing elements or formes to supports for attaching printing elements to flat type-beds

Definitions

  • FIG. 2. FIG. 5.
  • JOHN MURRAY a subject of the King of Great Britain and Ireland, and a resident of London, England, engineer, have invented certain new and useful Typographic Printing-Plates, (for which I have filed application in England application No. 12692,dated May 7 1920,) of which the following is the specification.
  • the plates are usually cast in curved casting boxes and bored out to fit the surface of the cylinder, or they are machined to size While flat, and'are then bent to the desired curvature.
  • the invention has for its object to provide a form of plate and adapt the cylinder to receive it in such wise that the disabilities of existing methods are largely or Wholly obviated.
  • the plate the printing surface of which may be formed in any desired manner, is initially curved as regards its outer surface to the radius of the printing surface of the cylinder upon which it is mounted while its inner surface is flat or substantially so, that is to say, is
  • the grooves are of such depth and width as while removing surplus meta-l, to leave the plate of adequate strength, the upstanding portions between the grooves acting as buttress webs and materially assisting to this end.
  • the plates are secured upon the c linder by usual or any convenient means.
  • F or example, buttress strips having undercut edges under which the beveled edges of the plates engage and which are lodged in transverse grooves in the cylinder may be provided.
  • Figure l is a sectional end elevation of the lmproved plate and part of a cylinder, Fig. 2 a plan and Fig. 3 a transverse section thereof.
  • the improved plate As shown in the drawings, the improved plate, the printing surface of which may be formed in any desired manner, is initially curved as regards its outer surface A to the radius of the printing surface of the cylinder B upon which it is mounted, while its inner surface C is flat.
  • Upon the inner surface of the plate is cut a series of grooves, the bottoms D of which are coaxial with the curvature of the outer surface A and of equal radius to that of the surface of the cylinder B. rlhe grooves are of such depth and width as to lighten the plate very considerably, but at the same time leave in the webs between the grooves adequate material for strength and stiffness of the plate.
  • What I claim is A typographie printing plate and cylinder therefor, the plate being curved on its outer surface to the radius of the printing surface and initially fiat or substantially so on its inner surface and having in its inner surface a series of grooves the bottoms of which are curved to the radius of the surface of the cylinder and the cylinder having in it a series of circumferential grooves counterpart to the ribs in the inner surface of the plate, as set forth.

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  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Printing Plates And Materials Therefor (AREA)

Description

.I`-. MURRAY.
TYPOGRAPHIC PRINTING PLATE.
APPLICATION HLED AuG.15.1921.
1,396,653. Patented Nov. s, 1921.
FIG. 2. FIG. 5.
/NVENTO' UNITED STATES PATENT FFlCE.
JOHN MURRAY, OF LONDON, ENGLAND.
TYPOGRAPHIC PRINTING-PLATE.
Application led August 15, 1921. Serial No. 492,488.
To all whom it ma concern:
Be it known that JOHN MURRAY, a subject of the King of Great Britain and Ireland, and a resident of London, England, engineer, have invented certain new and useful Typographic Printing-Plates, (for which I have filed application in England application No. 12692,dated May 7 1920,) of which the following is the specification.
In the preparation of printing surfaces for rotary machines the plates are usually cast in curved casting boxes and bored out to fit the surface of the cylinder, or they are machined to size While flat, and'are then bent to the desired curvature.
The degree of accuracy attained by either method is insuflicient for good work and the correction of the defects entails much loss of time.
The invention has for its object to provide a form of plate and adapt the cylinder to receive it in such wise that the disabilities of existing methods are largely or Wholly obviated.
According to the invention the plate, the printing surface of which may be formed in any desired manner, is initially curved as regards its outer surface to the radius of the printing surface of the cylinder upon which it is mounted while its inner surface is flat or substantially so, that is to say, is
is cut a series of grooves the bottoms of which are coaxial with the curvature of the outer surface.` The grooves are of such depth and width as while removing surplus meta-l, to leave the plate of adequate strength, the upstanding portions between the grooves acting as buttress webs and materially assisting to this end.
In the surface of the printing cylinder circumferential grooves counterpart tothe upstanding plate are formed. Thus the coacting `grooves and projections or ribs on plate and cyllnder, form definite and exact locating means in a longitudinal direction, while accuracy of radial position, depending as it does upon the accuracy readily attainable in cylindrical surfaces, is assured.
The plates are secured upon the c linder by usual or any convenient means. F or example, buttress strips having undercut edges under which the beveled edges of the plates engage and which are lodged in transverse grooves in the cylinder may be provided.
An example of the carrying out of the invention is shown on an accompanying sheet of explanatory drawings in which Figure l, is a sectional end elevation of the lmproved plate and part of a cylinder, Fig. 2 a plan and Fig. 3 a transverse section thereof.
As shown in the drawings, the improved plate, the printing surface of which may be formed in any desired manner, is initially curved as regards its outer surface A to the radius of the printing surface of the cylinder B upon which it is mounted, while its inner surface C is flat. Upon the inner surface of the plate is cut a series of grooves, the bottoms D of which are coaxial with the curvature of the outer surface A and of equal radius to that of the surface of the cylinder B. rlhe grooves are of such depth and width as to lighten the plate very considerably, but at the same time leave in the webs between the grooves adequate material for strength and stiffness of the plate.
j In the surface of the cylinder B are formed circumferentiali grooves E counterpart to the ribs left projecting beneath the plate. These coacting parts on cylinder and plate form definite and exact longitudinal locating means and accuracy of radial positioning depending as it does upon the ac- `curacy readily attainable in cylindrical surfaces, is also assured.
What I claim is A typographie printing plate and cylinder therefor, the plate being curved on its outer surface to the radius of the printing surface and initially fiat or substantially so on its inner surface and having in its inner surface a series of grooves the bottoms of which are curved to the radius of the surface of the cylinder and the cylinder having in it a series of circumferential grooves counterpart to the ribs in the inner surface of the plate, as set forth.
In testimony whereof I have signed my name to this specification.
JOHN MURRAY.
US492488A 1921-08-15 1921-08-15 Typographic printing-plate Expired - Lifetime US1396653A (en)

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