US3734017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic support for flexible printing plate
Assignee: WOOD IND INC US
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Filing: 1971-05-20
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Granted: 1973-05-22
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Expires: 1991-05-20
Abstract
Abstract A curved support adapted to be mounted on a plate cylinder of a rotary printing machine for supporting thereon a flexible printing plate having a magnetizable metallic backing layer. The support has a metallic liner with magnetic elements thereon for holding a printing plate thereto. Circumferentially spaced metal bars extend over the length of the support and the spaces between the bars and magnetic elements are filled with a combination of a plastic resin and a hardener to envelope the liner, magnetic elements and the metal bars. A method of making a support having a metallic liner therein utilized in holding a flexible printing plate to a printing cylinder involving the steps of affixing a plurality of first metal bars to the liner, positioning magnetic elements on the liner, positioning a plurality of second metal bars on the liner, and casting a plastic resin onto the liner to encase the magnetic elements and the metal bars.
Inventors
- 👤 J Trier
- 👤 J Enz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:52
CPC Classifications
B; B41; B41F; B41F27/00; B41F27/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
147 words
A curved support for mounting and supporting a flexible wraparound printing plate having a ferrous backing layer onto the outer periphery of a cylinder of a printing machine; said support comprising a curved inner metallic liner of a magnetizable soft ferrous material, a plurality of evenly spaced first bars of a ferrous material fixed on the outer periphery of said liner and extending longitudinally over the length thereof, a plurality of permanent magnets positioned on the outer periphery of said liner in longitudinally extending rows along each circumferential side of each said first bar, a plurality of second evenly spaced bars of a ferrous material positioned on the outer periphery of said liner and extending longitudinally over the length thereof between adjacent rows of said permanent magnets, and a plastic resin compound material filling the circumferential spaces between said second bars and said first bars and magnets.
Claim 2
Dependent Claim
147 words
A curved support for mounting and supporting a flexible wraparound printing plate having a ferrous backing layer onto the outer periphery of a cylinder of a printing machine; said support comprising a curved inner metallic liner of a magnetizable soft ferrous material, a plurality of evenly spaced first bars of a ferrous material fixed on the outer periphery of said liner and extending longitudinally over the length thereof, a plurality of permanent magnets positioned on the outer periphery of said liner in longitudinally extending rows along each circumferential side of each said first bar, a plurality of second evenly spaced bars of a ferrous material positioned on the outer periphery of said liner and extending longitudinally over the length thereof between adjacent rows of said permanent magnets, and a plastic resin compound material filling the circumferential spaces between said second bars and said first bars and magnets.
Claim 3
Dependent Claim
24 words
A support according to claim 1 having in addition a magnetically insulating layer of said compound bonded to the inner periphery of said liner.
Claim 4
Dependent Claim
45 words
A support according to claim 1 wherein each said magnet is disposed with its north pole directed away from said liner and with its south pole contacting said liner, and where said first and second bars contact said liner whereby they carry a south polarity.
Claim 5
Dependent Claim
29 words
A support according to claim 1 wherein said magnets and said first and second bars extend over 75 - 85 percent of the outer periphery of said curved support.
Claim 6
Dependent Claim
25 words
A support according to claim 1 wherein said plastic resin compound comprises two different resins of low temperature curable polyurethane, a hardener and a catalyst.
Claim 7
Dependent Claim
20 words
A support according to claim 1 wherein said second bars are spaced from said magnets and have a sinuous shape.
Claim 8
Dependent Claim
54 words
A support according to claim 1 wherein said liner has bores therein through which non-metallic fastening means may secure said liner to the outer periphery of a printing cylinder and having said plastic compound bonded to the under surface of said liner to form a magnetically insulating layer between said liner and said cylinder.
Claim 9
Dependent Claim
98 words
A curved saddle for supporting and mounting a flexible printing plate having a ferrous backing layer on to a cylinder of a printing machine, said saddle comprising an inner metallic liner, a magnatizable element in the form of a relatively thin steel sheet having a plurality of corrugations extending axially of said liner, a plurality of permanent magnets disposed in an axially extending row in alternate ones of said corrugations, and a plastic resin compound bonded to the inner and outer surfaces of said liner to form a magnetically insulating layer and enveloping said magnets and said element.
Claim 10
Dependent Claim
98 words
A curved saddle for supporting and mounting a flexible printing plate having a ferrous backing layer on to a cylinder of a printing machine, said saddle comprising an inner metallic liner, a magnatizable element in the form of a relatively thin steel sheet having a plurality of corrugations extending axially of said liner, a plurality of permanent magnets disposed in an axially extending row in alternate ones of said corrugations, and a plastic resin compound bonded to the inner and outer surfaces of said liner to form a magnetically insulating layer and enveloping said magnets and said element.
Claim 11
Dependent Claim
130 words
A curved saddle for supporting and mounting a flexible printing plate having a ferrous backing layer on to a cylinder of a printing machine, said saddle comprising a curved inner metallic liner having an inner concave surface and an outer convex surface, a magnetizable element in the form of a curved relatively thin steel sheet having a plurality of corrugations extending axially of said liner, a plurality of permanent magnets disposed in an axially extending row in alternate ones of said corrugations where the cross sectional area of each said magnet is less than the cross sectional area of the corrugation in which said magnet is disposed, and a plastic resin compounD filling the remainder of said corrugations containing said magnets and enveloping said liner, said element and said magnets.
Claim 12
Dependent Claim
130 words
A curved saddle for supporting and mounting a flexible printing plate having a ferrous backing layer on to a cylinder of a printing machine, said saddle comprising a curved inner metallic liner having an inner concave surface and an outer convex surface, a magnetizable element in the form of a curved relatively thin steel sheet having a plurality of corrugations extending axially of said liner, a plurality of permanent magnets disposed in an axially extending row in alternate ones of said corrugations where the cross sectional area of each said magnet is less than the cross sectional area of the corrugation in which said magnet is disposed, and a plastic resin compounD filling the remainder of said corrugations containing said magnets and enveloping said liner, said element and said magnets.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |