Printing – Multicolor – Rotary machines
Patent
1997-08-07
1999-05-18
Fisher, J. Reed
Printing
Multicolor
Rotary machines
101218, 101492, B41F13/46;7/04;7/12
Patent
active
059040939
ABSTRACT:
An apparatus and method allowing the changing of image plates or cassettes in an offset printing apparatus without the need to stop the press. Each blanket cylinder is associated with two image cylinders, where each image cylinder carries an associated image plate or cassette. When one of the image cylinders is engaged with the blanket cylinder, thereby transferring an image for printing on the web, the other image cylinder is disengaged from the blanket cylinder. As a result, the other image cylinder is stopped, allowing the image plate or cassette to be changed without the need to stop the entire press operation. After the image plate or cassette is changed on the stopped image cylinder, that image cylinder may be subsequently engaged with the blanket cylinder, while the other image cylinder is disengaged, thereafter allowing that image cylinder to have its image plate or cassette changed. The present invention can include a driving and clutching arrangement which allows an image cylinder which has been stopped for image plate or cassette exchange to be restarted and engaged with the blanket cylinder, while the other image cylinder which was engaged with the blanket cylinder and printing on the web is stopped.
REFERENCES:
patent: 2051573 (1936-08-01), Quick et al.
patent: 2384843 (1945-09-01), Lowe
patent: 2425167 (1947-08-01), Whitehead
patent: 5063844 (1991-11-01), Fausel
patent: 5134934 (1992-08-01), Knauer et al.
Fisher J. Reed
Heidelberg Web Press, Inc.
Heidelberger Druckmaschinen AG
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