US3771440A - Process of preparing a printing plate for accurate registration - Google Patents

Process of preparing a printing plate for accurate registration Download PDF

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US3771440A
US3771440A US00230249A US3771440DA US3771440A US 3771440 A US3771440 A US 3771440A US 00230249 A US00230249 A US 00230249A US 3771440D A US3771440D A US 3771440DA US 3771440 A US3771440 A US 3771440A
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plate
printing
shearing
printing plate
punching
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US00230249A
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W Eburn
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WR Grace and Co Conn
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Assigned to W. R. GRACE & CO.-CONN. reassignment W. R. GRACE & CO.-CONN. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: GRACE MERGER CORP. A CT CORP. (MERGED INTO), W. R. GRACE & CO. A CT. CORP.
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F9/00—Registration or positioning of originals, masks, frames, photographic sheets or textured or patterned surfaces, e.g. automatically
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/36—Means for registering or alignment of print plates on print press structure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
    • Y10T29/5116—Plural diverse manufacturing apparatus including means for metal shaping or assembling forging and bending, cutting or punching

Definitions

  • This invention relates to a method for preparing a printing plate for accurate press registration. More particularly, the present invention provides a method for preparing a printing plate for direct introduction onto a press saddle by accurately shearing the edges thereof while punching saddle engaging slots along opposite bended ends of the plate.
  • printing plates may be prepared using photocurable compositions.
  • One example of such a method is that described in US. Pat. No. 3,615,450.
  • a thin metal support plate such as of aluminum, steel or the like
  • the present invention provides a method which prepares flexible thin printing plates, especially those witha thin metal support backing, for direct introduction, accurately aligned onto a printing press saddle.
  • registration areas are provided in non-printing areas of the transparency such that upon exposure the registration areas become part of the non-printing photocured areas of the printing plate being processed. These registration areas are carefully aligned with the printing area and, as will be subsequently apparent, they eliminate great concern for alignment of the saddle engaging areas of the metal backing at the time of exposure.
  • the finally developed plate is ready for further processing steps of shearing, punching, and bending.
  • the present method includes the steps of providing registration areas on a transparency such that registration areas accurately aligned relative to the printing area will appear on a metal backed printing plate by way of exposure, positioning the printing plate with registration areas after development in a fixed location, shearing the plate along a width measurement thereof, shearing the plate and punching saddle engaging slots along opposite ends of a length measurement thereof, and bending edges having the saddle engaging slots.
  • bending is accompanied by stretching in the length direction to insure against spring return of the bended edges to original position.
  • FIG. 1 diagrammatically illustrates, as a perspective view, exposing through a transparency to effect positioning of registration areas
  • FIG. 2 shows a side elevational view in partial section illustrating the positioning of registration areas in fixed location
  • FIG. 3 similarly taken to FIG. 2, illustrates shearing along the length of the plate
  • FIG. 4 is a side elevation view in partial section taken 90 removed to that of FIG. 2, and illustrates shearing of edges and punching of saddle engaging slots along opposite ends of the plate;
  • FIG. 5 similarly taken to FIG. 4 illustrates bending of the opposite ends of the plate which may be followed, if desired, by the step of FIG. 4;
  • FIG. 6 is a perspective top view of the finally processed plate ready for mounting onto the saddle of a printing press.
  • the present invention initially involves providing registration areas aligned relative to the printing plate area.
  • printing plate 10 is illustrated having a metal backing 12, a photocurable polymer 14 with printing area 16, and registration areas 18 formed thereon.
  • the printing area and registration areas result by exposing transparency film 20 having printing areas 22 and registration areas 24 thereon, using a light source 26 for exposure such as ultra-violet light.
  • printing plate 10 is then processed at the step of FIG. 2.
  • the printing plate 10 having metal backing 12 is placed on vacuum table 30 or other convenient support whereon it is aligned using aligning means 28 which cooperate with registration areas 18.
  • the printing plate is held in fixed position by a suitable means such as by vacuum ports 32 receiving vacuum from a convenient source by line 34. It is recognized that other means may be used to secure the plate in fixed position provided that such means does not interfere with subsequent processing steps hereof and also that damage of the printing surface does not result.
  • the plate After the printing plate has been registered and fixed in position such as that illustrated in FIG. 2, the plate is sheared along the width thereof.
  • shearing of the width edges may be accomplished by shearing means 36 either prior to or subsequent to shearing of the ends of the plate, as desired.
  • the ends of the plate are sheared, punched, and bent, in sequence as desired, such as illustrated in FIGS. 4 and 5.
  • shearing means 38 engages the plate for accurately shearing the end edges of the plate relative to the printing areas. Punching of saddle engaging slots may be accomplished by punch 40 illustrated as a component of shearing means 38.
  • the sequence of end shearing, punching and bending is accomplished without release of the plate either during or between each processing step.
  • the sequence of shearing, punching and bending with optional bend stretching is accomplished before the plate is released.
  • ends of metal backing 12 of printing plate 10 in fixed position over vacuum table 30, are engaged by shearing means 38 and punch 40.
  • Shearing means 38 and punch 40 are disposed such that they may rotate as indicated by arrow 41 to effect bending, and further being disposed such that they may stretch the plate during bending in the direction of arrow 42.
  • Stretching is optionally desired in instances when metal backings are characterized such that bends have a spring tendency to return to normal flat position, i.e., spring type steel or the like. In such instances, stretching during bending has a tendency to insure retention of the bend.
  • the end processing means release the plate which is now ready for introduction onto a saddle.
  • FIG. 6 illustrates finally processed printing plate 44 having accurately positioned edges 46 bended for mounting by way of slots 48 onto the saddle of a printing press.
  • the printing plates formed by the process of the instant invention may be employed in various types of printing including but not limited to intaglio printing, flexographic printing, letterpress printing, dry offset printing, and the like.
  • a method for preparing-a printing plate for accurate registration onto a press consisting essentially of providing registration areas in nonprinting portions of a printing plate having a thin metal support layer, positioning the printing plate using the registration areas in fixed location and maintaining the plate in fixed position while shearing the plate along a width measurement thereof, shearing the plate and punching saddle engaging slots along opposite ends of a length measurement thereof, and bending edges while simultaneously punching saddle engaging slots, said bending and punching being accompanied by simultaneous stretching in the length direction to insure against spring return of the bended edges to original position.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

The invention disclosed is a method for preparing a printing plate for accurate registration onto a press. Registration areas are first provided in proper alignment relative to the printing area of the plate being processed. Next, means are provided for positioning the registration areas in fixed location for shearing of the plate along the width and length edges thereof. Shearing of the length, along opposite ends of the plate, is accompanied by punching saddle engaging slots, and binding. The plate so processed is ready for accurate introduction directly onto a printing press where the ends are conveniently secured in place about a saddle.

Description

United States Patent Eburn, jr.
[ Nov. 13, 1973 PROCESS OF PREPARING A PRINTING PLATE FOR ACCURATE REGISTRATION Appl. No.: 230,249
US. Cl '101/1, 29/34, 72/294,
101/DlG. 12, 101/4151 [51] Int. Cl B21d 43/28, B41f 27/06 [58] Field of Search 101/DIG. 12, 415.1, 101/1; 29/34; 72/294, 306
[56] References Cited UNITED STATES PATENTS 1,461,068 7/1923 Regensteiner 101/415.l 2,460,483 2/1949 Berliner 72/294 2,579,753 12/1951 Norquist 72/294 2,963,066 12/1960 Nelson 72/294 2,680,405 6/1954 Faeber et a1... lOl/DIG. 12 2,785,630 3/1957 LeGate lOl/DIG. 12 2,786,385 3/1957 Satre et al lOl/DlG. 12 3,288,063 11/1966 Bungay lOl/DIG. 12
2,234,170 3/1941 Huck 101/DlG. 12 2,192,924 3/1940 Maher et a1. 12 2,659,282 11/1953 Freund 12 2,668,363 2/1954 Lippitt lOl/DlG. 12
Primary Examiner-Clyde I. Coughenour Att0rney-Eugene M. Bond ABSTRACT plate, is accompanied by punching saddle engaging slots, and binding. The plate so processed is ready for accurate introduction directly onto a printing press where the ends are conveniently secured in place about a saddle.
1 Claim, 6 Drawing Figures PATENIEUMIV 13 ms SHEET 18F 2 Www PROCESS OF PREPARING A PRINTING PLATE FOR ACCURATE REGISTRATION This invention relates to a method for preparing a printing plate for accurate press registration. More particularly, the present invention provides a method for preparing a printing plate for direct introduction onto a press saddle by accurately shearing the edges thereof while punching saddle engaging slots along opposite bended ends of the plate.
It is known that printing plates may be prepared using photocurable compositions. One example of such a method is that described in US. Pat. No. 3,615,450. In preparing such plates especially when using a thin metal support plate such as of aluminum, steel or the like, it becomes necessary to accurately align the printing area relative to the saddle engaging areas prior to introduction onto a printing press. The present invention provides a method which prepares flexible thin printing plates, especially those witha thin metal support backing, for direct introduction, accurately aligned onto a printing press saddle.
When a printing plate is prepared by exposing a photocurable composition through a transparency, registration areas are provided in non-printing areas of the transparency such that upon exposure the registration areas become part of the non-printing photocured areas of the printing plate being processed. These registration areas are carefully aligned with the printing area and, as will be subsequently apparent, they eliminate great concern for alignment of the saddle engaging areas of the metal backing at the time of exposure.
Having so prepared a printing plate, the finally developed plate is ready for further processing steps of shearing, punching, and bending.
Generally stated, the present method includes the steps of providing registration areas on a transparency such that registration areas accurately aligned relative to the printing area will appear on a metal backed printing plate by way of exposure, positioning the printing plate with registration areas after development in a fixed location, shearing the plate along a width measurement thereof, shearing the plate and punching saddle engaging slots along opposite ends of a length measurement thereof, and bending edges having the saddle engaging slots. In an embodiment of the present invention, bending is accompanied by stretching in the length direction to insure against spring return of the bended edges to original position.
Practice of the present invention will become more apparent from the following detailed descriptions taken in connection with the accompanying drawings wherein like numerals refer to similar elements throughout the several views.
FIG. 1 diagrammatically illustrates, as a perspective view, exposing through a transparency to effect positioning of registration areas;
FIG. 2 shows a side elevational view in partial section illustrating the positioning of registration areas in fixed location;
FIG. 3 similarly taken to FIG. 2, illustrates shearing along the length of the plate;
FIG. 4 is a side elevation view in partial section taken 90 removed to that of FIG. 2, and illustrates shearing of edges and punching of saddle engaging slots along opposite ends of the plate;
FIG. 5 similarly taken to FIG. 4 illustrates bending of the opposite ends of the plate which may be followed, if desired, by the step of FIG. 4; and
FIG. 6 is a perspective top view of the finally processed plate ready for mounting onto the saddle of a printing press.
Referring to the drawings, the present invention initially involves providing registration areas aligned relative to the printing plate area. In FIG. 1, printing plate 10 is illustrated having a metal backing 12, a photocurable polymer 14 with printing area 16, and registration areas 18 formed thereon. The printing area and registration areas result by exposing transparency film 20 having printing areas 22 and registration areas 24 thereon, using a light source 26 for exposure such as ultra-violet light.
After exposure of the plate has been effected, with subsequent processing as may be necessary for development, printing plate 10 is then processed at the step of FIG. 2. The printing plate 10 having metal backing 12 is placed on vacuum table 30 or other convenient support whereon it is aligned using aligning means 28 which cooperate with registration areas 18. The printing plate is held in fixed position by a suitable means such as by vacuum ports 32 receiving vacuum from a convenient source by line 34. It is recognized that other means may be used to secure the plate in fixed position provided that such means does not interfere with subsequent processing steps hereof and also that damage of the printing surface does not result.
After the printing plate has been registered and fixed in position such as that illustrated in FIG. 2, the plate is sheared along the width thereof. Thus, because of the registration areas and by fixing the plate in position, accurate shearing of the width edges relative the printing area is accomplished. Shearing of the width edges may be accomplished by shearing means 36 either prior to or subsequent to shearing of the ends of the plate, as desired.
The ends of the plate are sheared, punched, and bent, in sequence as desired, such as illustrated in FIGS. 4 and 5. With plate 10 in fixed position shearing means 38 engages the plate for accurately shearing the end edges of the plate relative to the printing areas. Punching of saddle engaging slots may be accomplished by punch 40 illustrated as a component of shearing means 38.
In order to avoid movement of plate 10 from fixed position, the sequence of end shearing, punching and bending is accomplished without release of the plate either during or between each processing step. Thus, once the ends of the plate are engaged for end processing, the sequence of shearing, punching and bending with optional bend stretching is accomplished before the plate is released.
In FIGS. 4 and 5, ends of metal backing 12 of printing plate 10 in fixed position over vacuum table 30, are engaged by shearing means 38 and punch 40. Shearing means 38 and punch 40 are disposed such that they may rotate as indicated by arrow 41 to effect bending, and further being disposed such that they may stretch the plate during bending in the direction of arrow 42. Stretching is optionally desired in instances when metal backings are characterized such that bends have a spring tendency to return to normal flat position, i.e., spring type steel or the like. In such instances, stretching during bending has a tendency to insure retention of the bend. After bending has been accomplished, the end processing means release the plate which is now ready for introduction onto a saddle.
After the sequence of FIGS. 4 and 5, the means used to retain the plate in fixed position, such as vacuum table 30, is replaced thus providing a printing plate such as that illustrated in FIG. 6.
FIG. 6 illustrates finally processed printing plate 44 having accurately positioned edges 46 bended for mounting by way of slots 48 onto the saddle of a printing press.
Although the present method has been described for convenience with regard to photocuring techniques, it will be apparent that it is readily applicable to other printing plate processing techniques such as photoengraving, thermal engraving, and direct etching.
The printing plates formed by the process of the instant invention may be employed in various types of printing including but not limited to intaglio printing, flexographic printing, letterpress printing, dry offset printing, and the like.
Although a preferred embodiment of the invention has been illustrated herein, it is to be understood that various changes and modifications may be made in the construction and arrangement of elements without departing from the spirit and scope of the invention as defined.
What is claimed is:
1. A method for preparing-a printing plate for accurate registration onto a press, said method consisting essentially of providing registration areas in nonprinting portions of a printing plate having a thin metal support layer, positioning the printing plate using the registration areas in fixed location and maintaining the plate in fixed position while shearing the plate along a width measurement thereof, shearing the plate and punching saddle engaging slots along opposite ends of a length measurement thereof, and bending edges while simultaneously punching saddle engaging slots, said bending and punching being accompanied by simultaneous stretching in the length direction to insure against spring return of the bended edges to original position.

Claims (1)

1. A method for preparing a printing plate for accurate registration onto a press, said method consisting essentially of providing registration areas in non-printing portions of a printing plate having a thin metal support layer, positioning the printing plate using the registration areas in fixed location and maintaining the plate in fixed position while shearing the plate along a width measurement thereof, shearing the plate and punching saddle engaging slots along opposite ends of a length measurement thereof, and bending edges while simultaneously punching saddle engaging slots, said bending and punching being accompanied by simultaneous stretching in the length direction to insure against spring return of the bended edges to original position.
US00230249A 1972-02-29 1972-02-29 Process of preparing a printing plate for accurate registration Expired - Lifetime US3771440A (en)

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JP (1) JPS4898902A (en)
AU (1) AU464086B2 (en)
BE (1) BE795573A (en)
CA (1) CA960084A (en)
DE (1) DE2306290A1 (en)
FR (1) FR2174572A5 (en)
IT (1) IT979470B (en)
NL (1) NL7302374A (en)
ZA (1) ZA731021B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4594868A (en) * 1981-10-15 1986-06-17 Dai Nippon Insatsu Kabushiki Kaisha System and plate bending machine for registering in an offset printing press
US4764795A (en) * 1987-04-27 1988-08-16 Burbey Mark J Prepress graphic registration system
US5255607A (en) * 1990-12-21 1993-10-26 Fuji Photo Film Co., Ltd. Method and apparatus for maintaining registration when making a printing plate
WO1996006738A1 (en) * 1994-08-26 1996-03-07 Tension Envelope Corporation Apparatus and method for precisely drilling alignment pin register holes in pre-marked flexible printing plates
US5860312A (en) * 1995-11-29 1999-01-19 Anderson; Carl E. Bending brake apparatus
US5970774A (en) * 1998-05-15 1999-10-26 Burgess Industries, Inc. Apparatus and method for corner cutting and edge bending of lithographic plates
US20060191309A1 (en) * 2005-01-05 2006-08-31 Carl Anderson Sheet bending brake

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1461068A (en) * 1922-07-29 1923-07-10 Regensteiner Theodore Printing roller
US2192924A (en) * 1936-08-11 1940-03-12 American Can Co Printing method
US2234170A (en) * 1936-09-02 1941-03-11 Hoe & Co R Means for preparing printing plates for application to printing cylinders
US2460483A (en) * 1945-03-27 1949-02-01 Engineering & Res Corp Cutting means for metal stretching dies
US2579753A (en) * 1944-11-28 1951-12-25 Glenn H Norquist Punching and forming mechanism
US2659282A (en) * 1950-01-19 1953-11-17 Intertype Corp Method for correction and make-up of type matter for planographic printing processes
US2668363A (en) * 1950-08-01 1954-02-09 Cleveland Shopping News Compan Means for registering printing plates
US2680405A (en) * 1949-08-02 1954-06-08 Time Inc Method for preregistering color plates
US2785630A (en) * 1954-02-15 1957-03-19 Clifford W Legate Newspaper type chase
US2786385A (en) * 1953-10-19 1957-03-26 Sta Hi Corp Comparator for stereotype mats and the like
US2963066A (en) * 1955-09-14 1960-12-06 Artcraft Venetian Blind Mfg Co Apparatus for cutting and bending strip material
US3288063A (en) * 1965-05-05 1966-11-29 Electrographic Corp Method and apparatus for preparing multipage printing plates and the like

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1461068A (en) * 1922-07-29 1923-07-10 Regensteiner Theodore Printing roller
US2192924A (en) * 1936-08-11 1940-03-12 American Can Co Printing method
US2234170A (en) * 1936-09-02 1941-03-11 Hoe & Co R Means for preparing printing plates for application to printing cylinders
US2579753A (en) * 1944-11-28 1951-12-25 Glenn H Norquist Punching and forming mechanism
US2460483A (en) * 1945-03-27 1949-02-01 Engineering & Res Corp Cutting means for metal stretching dies
US2680405A (en) * 1949-08-02 1954-06-08 Time Inc Method for preregistering color plates
US2659282A (en) * 1950-01-19 1953-11-17 Intertype Corp Method for correction and make-up of type matter for planographic printing processes
US2668363A (en) * 1950-08-01 1954-02-09 Cleveland Shopping News Compan Means for registering printing plates
US2786385A (en) * 1953-10-19 1957-03-26 Sta Hi Corp Comparator for stereotype mats and the like
US2785630A (en) * 1954-02-15 1957-03-19 Clifford W Legate Newspaper type chase
US2963066A (en) * 1955-09-14 1960-12-06 Artcraft Venetian Blind Mfg Co Apparatus for cutting and bending strip material
US3288063A (en) * 1965-05-05 1966-11-29 Electrographic Corp Method and apparatus for preparing multipage printing plates and the like

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4594868A (en) * 1981-10-15 1986-06-17 Dai Nippon Insatsu Kabushiki Kaisha System and plate bending machine for registering in an offset printing press
US4764795A (en) * 1987-04-27 1988-08-16 Burbey Mark J Prepress graphic registration system
US5255607A (en) * 1990-12-21 1993-10-26 Fuji Photo Film Co., Ltd. Method and apparatus for maintaining registration when making a printing plate
WO1996006738A1 (en) * 1994-08-26 1996-03-07 Tension Envelope Corporation Apparatus and method for precisely drilling alignment pin register holes in pre-marked flexible printing plates
US5860312A (en) * 1995-11-29 1999-01-19 Anderson; Carl E. Bending brake apparatus
US5970774A (en) * 1998-05-15 1999-10-26 Burgess Industries, Inc. Apparatus and method for corner cutting and edge bending of lithographic plates
US20060191309A1 (en) * 2005-01-05 2006-08-31 Carl Anderson Sheet bending brake
US7412862B2 (en) 2005-01-05 2008-08-19 Alum-A-Pole Corporation Sheet bending brake

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Publication number Publication date
CA960084A (en) 1974-12-31
FR2174572A5 (en) 1973-10-12
IT979470B (en) 1974-09-30
BE795573A (en) 1973-06-18
JPS4898902A (en) 1973-12-15
ZA731021B (en) 1973-11-28
AU5220873A (en) 1974-08-15
DE2306290A1 (en) 1973-09-06
AU464086B2 (en) 1975-08-14
NL7302374A (en) 1973-08-31

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Owner name: W. R. GRACE & CO.-CONN., MASSACHUSETTS

Free format text: MERGER;ASSIGNORS:GRACE MERGER CORP. A CT CORP. (MERGED INTO);W. R. GRACE & CO. A CT. CORP.;REEL/FRAME:005206/0001

Effective date: 19880525