Photocopying – Projection printing and copying cameras – Detailed holder for original
Patent
1982-02-18
1983-07-12
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Detailed holder for original
352102, 353110, 354121, G03B 2762
Patent
active
043927432
ABSTRACT:
A ratchet assembly properly positions selected film frames at a film gate aperture of a photographic printer. The ratchet assembly includes a ratchet wheel rotatably attached to a base having a plurality of ratchet teeth. Each tooth has a rotation-prevention edge and a ramped edge with the ramped edge being inclined toward the rotation-prevention edge of an adjacent tooth. A positioning pawl is pivotally attached to the base proximate a first end and has a head portion proximate a second end. The head portion has a first edge adapted to slidably engage the ramped edge of the ratchet wheel. The head portion of the positioning pawl is biased against the ratchet wheel such that if the ratchet wheel is indexed too far and does not properly position the selected film frame at the print gate aperture, the head portion forces the ratchet wheel to move back by slidably engaging the ramped surface of the ratchet wheel until an alignment pawl engages a notch located on the periphery of the disc film unit. The notch is in a precisely defined spatial relationship to the selected film frame at the print gate aperture and the alignment pawl ensures that the selected film frame is optically centered.
REFERENCES:
patent: 3873194 (1975-03-01), Schwartz
patent: 4132469 (1979-01-01), Harvey
patent: 4194822 (1980-03-01), Sethi
patent: 4203733 (1980-05-01), Clifton et al.
patent: 4204733 (1980-05-01), Modney et al.
patent: 4208116 (1980-06-01), Morse
patent: 4208117 (1980-06-01), Harvey et al.
patent: 4212673 (1980-07-01), Sethi et al.
patent: 4255034 (1981-03-01), Harvey et al.
patent: 4264169 (1981-04-01), Harvey
patent: 4268145 (1981-05-01), Harvey et al.
Research Disclosure, Aug. 1978, Nos. 17287, 17289, 1978 Industrial Opportunities Ltd., Homewell, Havant, Hampshire, United Kingdom.
Pako Corporation
Wintercorn Richard A.
LandOfFree
Disc film advance assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Disc film advance assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disc film advance assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-196161