Vacuum exposure frame with unworked glass insert/plate exposer a

Details Vacuum exposure frame with unworked glass insert/plate exposer a Vacuum exposure frame with unworked glass insert/plate exposer a

1995-03-07

1998-12-29

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Detailed holder for photosensitive paper

355 91, 355128, G03B 2758, G03B 2720

Patent

active

058546723

ABSTRACT:
An improved vacuum exposure frame for use in making exposed aluminum printing or lithographic plates permits the use of unworked glass, preferably tempered glass, rather than polycarbonate plexiglass (which is easily scratched) of the prior art replacement of the transparent image-exposure-window material. The frame is routed on the lower aperture-facing portion of the exposure window, preferably by a 90.degree. routing having a horizontal face and a vertical face surrounding and defining the aperture underside. A preferred embodiment has a reverse depression preferably routed out of the horizontal face and a sealant-adhesive is inserted into the reverse depression and along the vertical face so as to secure the unworked glass to the frame. Separate ID windows with long lasting polycarbonate inserts are also in the frame where the main image exposure window aperture is shaped to contain preferably only the book pages to be exposed onto the aluminum plate. Additionally, glued polycarbonate vacuum towers of the prior art are replaced by aluminum vacuum towers threadably mechanically secured to the frame and not involved with the windows and their usage.

REFERENCES:
patent: 3634009 (1972-01-01), Van Dusen et al.
patent: 3751250 (1973-08-01), Moscony et al.
patent: 4089603 (1978-05-01), Jacobs
patent: 4324474 (1982-04-01), Kraemer et al.
patent: 4533240 (1985-08-01), Jasperson
patent: 4607953 (1986-08-01), Farris
patent: 4827316 (1989-05-01), Brown
patent: 4896186 (1990-01-01), Tokuda
patent: 4948539 (1990-08-01), Byers
patent: 5017960 (1991-05-01), Tuulse

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