Printing – Printing members – Rolling contact
Patent
1988-02-25
1989-04-25
Crowder, Clifford D.
Printing
Printing members
Rolling contact
1013891, 269 8, B41F 2702
Patent
active
048236977
ABSTRACT:
A printing plate cylinder having permanent magnets disposed therein includes an elongate member made of a highly permeable magnetic material and having a cylindrical configuration. The elongate member includes opposite axial end portions and a central portion connecting the opposite axial end portions. The elongate member is supported for rotation about its longitudinal central axis by the opposite axial end portions. The longitudinal central axis of the elongate member is parallel to and eccentric to the longitudinal central axis of the elongate member. When the elongate member is in a first position, the central portion of the elongate member is spaced away from a magnetic printing plate secured to the printing plate cylinder. In the first position of the elongate member, a magnetic field is established through the magnetic printing plate. When the elongate member is in a second position, the central portion of the elongate member is adjacent the magnetic printing plate. In the second position of the elongate member, the action of the magnetic field on the printing plate is partially terminated to provide ease of removing the magnetic printing plate from the printing plate cylinder.
REFERENCES:
patent: 1531492 (1925-03-01), Marquardt
patent: 1939681 (1933-12-01), Fleming
patent: 2243616 (1941-05-01), Bing
patent: 2280437 (1942-04-01), Levesque
patent: 2333230 (1943-11-01), Beechlyn
patent: 3017545 (1962-01-01), Meier
patent: 3217645 (1965-11-01), Martt
patent: 3624731 (1971-11-01), Lindberg
patent: 3745626 (1973-07-01), Bray
AM International Incorporated
Crowder Clifford D.
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