Patent US3878784A successfully refreshed from Google Patents.
US3878784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fastening a printing plate on a cylinder in a printing press and device for said fastening
Assignee: PRINTING EQUIPMENT AB
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Filing: 1974-02-01
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Granted: 1975-04-22
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Expires: 1994-02-01
Abstract
Abstract Method and apparatus for fastening a printing plate to the plate cylinder of a printing press. One edge of the printing plate is positioned against a pair of projections provided as part of a clamping assembly for clamping the aforementioned edge. The printing plate is substantially wrapped about a plate cylinder and the opposite edge is coupled to a second clamping assembly which in turn is provided with a pivot pin having an arm pivotally mounted thereto. The arm is provided with a roller which rollingly engages the sidewall of a recess provided in the printing cylinder. A first wedge shaped member is threadingly engaged by a threaded fastener which is secured to the second clamping assembly. A second wedge shaped member slidably engages the first wedge shaped member and moves away from the first wedge shaped member as the aforesaid threaded fastener is tightened thereby causing the pivotal arm to rotate about the axis of the roller member to draw the printing plate more tightly about the printing cylinder. Thus the printing plate is secured by three triangularly positioned points two of which are stationary and the third of which is movable to automatically compensate for any sidewise movement of the printing plate.
Inventors
- 👤 Ingvald Dyrberg
- 👤 Algot Ingemar Eriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:36
CPC Classifications
B; B41; B41F; B41F27/00; B41F27/12; B41F27/1218; B41F27/1225; B41F27/1231
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
284 words
A method for fastening a printing plate to a printing plate cylinder in a printing press at three spaced points, said three points defining a triangle comprising the steps of: affixing a first marginal edge of the printing plate to a ruler assembly; providing a channel in the printing plate cylinder having first and second spaced parallel side walls; providing two projections along said ruler assembly, said two projections abutting against said first side wall of said channel; wrapping said printing plate around the cylinder and securing the opposite marginal edge of said printing plate to a second ruler assembly; swingably mounting the first end of an arm to said second ruler assembly; providing a rollable bearing upon said swing arm at a point intermediate the ends of said swing arm; providing a wedging surface at the free end of said swing arm; positioning the surface of a wedge member against the wedge surface provided at the free end of said swing arm; positioning said second ruler assembly in said channel with said bearing resting against said second side wall; moving said wedge member toward said swingable arm by means of a screw to rotate said swing arm about its pivot point threby urging the bearing of said swing arm against the remaining side wall of said channel causing the second ruler assembly to move away from said second side wall, and thereby tightening said printing plate about said printing plate cylinder, said rollable bearing being the third point of contact of said printing plate with said printing cylinder, whereby said rollable bearing is free to move laterally in order to relieve uneven tensions applied by said printing plate to the second ruler assembly.
Claim 2
Independent Claim
284 words
A method for fastening a printing plate to a printing plate cylinder in a printing press at three spaced points, said three points defining a triangle comprising the steps of: affixing a first marginal edge of the printing plate to a ruler assembly; providing a channel in the printing plate cylinder having first and second spaced parallel side walls; providing two projections along said ruler assembly, said two projections abutting against said first side wall of said channel; wrapping said printing plate around the cylinder and securing the opposite marginal edge of said printing plate to a second ruler assembly; swingably mounting the first end of an arm to said second ruler assembly; providing a rollable bearing upon said swing arm at a point intermediate the ends of said swing arm; providing a wedging surface at the free end of said swing arm; positioning the surface of a wedge member against the wedge surface provided at the free end of said swing arm; positioning said second ruler assembly in said channel with said bearing resting against said second side wall; moving said wedge member toward said swingable arm by means of a screw to rotate said swing arm about its pivot point threby urging the bearing of said swing arm against the remaining side wall of said channel causing the second ruler assembly to move away from said second side wall, and thereby tightening said printing plate about said printing plate cylinder, said rollable bearing being the third point of contact of said printing plate with said printing cylinder, whereby said rollable bearing is free to move laterally in order to relieve uneven tensions applied by said printing plate to the second ruler assembly.
Claim 3
Dependent Claim
332 words
Apparatus for uniformly tightening a thin printing plate on a plate cylinder in a printing press, said cylinder having a channel extending the length of said cylinder, said channel having first and second spaced side wall portions; a first elongated ruler assembly; means for securing one marginal edge of said printing plate to said first ruler assembly; one edge of said first ruler assembly having first and second spaced projections being positioned to bear against said first side waLl; a second ruler assembly for securing the remaining marginal edge of said plate; an arm having a first end pivotally secured to said second ruler assembly; the free end of said arm having a wedge-shaped cross-section to provide a first wedge surface; a wedge member being positioned to have one surface thereof in sliding engagement with said first wedge surface; said wedge member having a tapped aperture; a screw member threadedly engaging said tapped aperture; said second ruler assembly having an opening in alignment with the tapped aperture in said wedge member; a rollable bearing mounted on said arm intermediate its ends; said bearing being positioned to rollingly engage said second side wall; said wedge member being adapted to swing the free end of said swing arm toward said second side wall when said screw member is tightened to urge the wedge member toward the second ruler assembly and move the bearing toward the second side wall causing said second ruler assembly to move away from said second side wall; said bearing being the only contact between said second side wall and said second ruler assembly whereby said plate is secured to said cylinder at only three points, said first and second projections constituting two of said three points and said bearing being the third point, whereby the rolling engagement between said bearing and said second side wall permits lateral movement of said second ruler assembly to assure the application of uniform tension upon said plate by said first and second ruler assemblies.
Claim 4
Dependent Claim
332 words
Apparatus for uniformly tightening a thin printing plate on a plate cylinder in a printing press, said cylinder having a channel extending the length of said cylinder, said channel having first and second spaced side wall portions; a first elongated ruler assembly; means for securing one marginal edge of said printing plate to said first ruler assembly; one edge of said first ruler assembly having first and second spaced projections being positioned to bear against said first side waLl; a second ruler assembly for securing the remaining marginal edge of said plate; an arm having a first end pivotally secured to said second ruler assembly; the free end of said arm having a wedge-shaped cross-section to provide a first wedge surface; a wedge member being positioned to have one surface thereof in sliding engagement with said first wedge surface; said wedge member having a tapped aperture; a screw member threadedly engaging said tapped aperture; said second ruler assembly having an opening in alignment with the tapped aperture in said wedge member; a rollable bearing mounted on said arm intermediate its ends; said bearing being positioned to rollingly engage said second side wall; said wedge member being adapted to swing the free end of said swing arm toward said second side wall when said screw member is tightened to urge the wedge member toward the second ruler assembly and move the bearing toward the second side wall causing said second ruler assembly to move away from said second side wall; said bearing being the only contact between said second side wall and said second ruler assembly whereby said plate is secured to said cylinder at only three points, said first and second projections constituting two of said three points and said bearing being the third point, whereby the rolling engagement between said bearing and said second side wall permits lateral movement of said second ruler assembly to assure the application of uniform tension upon said plate by said first and second ruler assemblies.
Claim 5
Dependent Claim
332 words
Apparatus for uniformly tightening a thin printing plate on a plate cylinder in a printing press, said cylinder having a channel extending the length of said cylinder, said channel having first and second spaced side wall portions; a first elongated ruler assembly; means for securing one marginal edge of said printing plate to said first ruler assembly; one edge of said first ruler assembly having first and second spaced projections being positioned to bear against said first side waLl; a second ruler assembly for securing the remaining marginal edge of said plate; an arm having a first end pivotally secured to said second ruler assembly; the free end of said arm having a wedge-shaped cross-section to provide a first wedge surface; a wedge member being positioned to have one surface thereof in sliding engagement with said first wedge surface; said wedge member having a tapped aperture; a screw member threadedly engaging said tapped aperture; said second ruler assembly having an opening in alignment with the tapped aperture in said wedge member; a rollable bearing mounted on said arm intermediate its ends; said bearing being positioned to rollingly engage said second side wall; said wedge member being adapted to swing the free end of said swing arm toward said second side wall when said screw member is tightened to urge the wedge member toward the second ruler assembly and move the bearing toward the second side wall causing said second ruler assembly to move away from said second side wall; said bearing being the only contact between said second side wall and said second ruler assembly whereby said plate is secured to said cylinder at only three points, said first and second projections constituting two of said three points and said bearing being the third point, whereby the rolling engagement between said bearing and said second side wall permits lateral movement of said second ruler assembly to assure the application of uniform tension upon said plate by said first and second ruler assemblies.
Claim 6
Dependent Claim
332 words
Apparatus for uniformly tightening a thin printing plate on a plate cylinder in a printing press, said cylinder having a channel extending the length of said cylinder, said channel having first and second spaced side wall portions; a first elongated ruler assembly; means for securing one marginal edge of said printing plate to said first ruler assembly; one edge of said first ruler assembly having first and second spaced projections being positioned to bear against said first side waLl; a second ruler assembly for securing the remaining marginal edge of said plate; an arm having a first end pivotally secured to said second ruler assembly; the free end of said arm having a wedge-shaped cross-section to provide a first wedge surface; a wedge member being positioned to have one surface thereof in sliding engagement with said first wedge surface; said wedge member having a tapped aperture; a screw member threadedly engaging said tapped aperture; said second ruler assembly having an opening in alignment with the tapped aperture in said wedge member; a rollable bearing mounted on said arm intermediate its ends; said bearing being positioned to rollingly engage said second side wall; said wedge member being adapted to swing the free end of said swing arm toward said second side wall when said screw member is tightened to urge the wedge member toward the second ruler assembly and move the bearing toward the second side wall causing said second ruler assembly to move away from said second side wall; said bearing being the only contact between said second side wall and said second ruler assembly whereby said plate is secured to said cylinder at only three points, said first and second projections constituting two of said three points and said bearing being the third point, whereby the rolling engagement between said bearing and said second side wall permits lateral movement of said second ruler assembly to assure the application of uniform tension upon said plate by said first and second ruler assemblies.
References Cited (Backward Citations)
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US2123997A
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US2737887A
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US2768579A
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US3119331A
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US3311052A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |