Apparatus for advancing, guiding and locating webs of photosensi

Details Apparatus for advancing, guiding and locating webs of photosensi Apparatus for advancing, guiding and locating webs of photosensi

1992-09-09

1995-04-04

Picard, Leo P.

Photocopying

Projection printing and copying cameras

Detailed holder for original

271 90, 355202, 355308, G03B 2762

Patent

active

054041953

ABSTRACT:
An exposed and developed photographic film is moved through a copying machine between a fixedly mounted lower guide member and an upper guide member which is movable up and down away from and toward the lower guide member. The confronting surfaces of the guide members have raised portions which surround registering windows of the guide members and engage a film all the way around a film frame which is aligned with the windows when the film is brought to a halt. Once the imaging of the frame which is aligned with the windows is completed, several springs lift the upper guide member, and ports in the raised portions of the confronting surfaces discharge jets of compressed air which cause the film to levitate between the two guide members during advancement of the next film frame to a position of alignment with the windows. This reduces the likelihood of scratching of and/or other damage to the film during transport. The ports can receive compressed air without interruption or only while the upper guide member is lifted above and away from the lower guide member.

REFERENCES:
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patent: 4176947 (1979-12-01), Spence-Bate et al.
patent: 4257695 (1981-03-01), Langworthy
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patent: 5050853 (1991-09-01), LaVos et al.
patent: 5088713 (1992-02-01), Hayashi
patent: 5111241 (1992-05-01), Kralles

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