Photocopying – Contact printing – With scanning
Patent
1976-05-14
1978-09-05
Moses, Richard L.
Photocopying
Contact printing
With scanning
355 52, G03B 2710
Patent
active
041115511
ABSTRACT:
An apparatus for producing from a photographic transparency a contact copy that is controllably elongated or compressed in one dimension only. The transparency and a photosensitive film sheet are separately transported at different linear speeds past an elongated illuminated slit by a pair of drive rollers that are driven at different rotational rates. Segmented pressure rollers keep the transparency and film sheet in contact with their respective drive rollers during transport.
A differential speed drive mechanism is used to rotate the drive rollers at different speeds. This comprises a pair of complementarily tapered shafts, coaxially attached to the respective drive rollers, together with an O-ring that is caught between the shafts at a selectable axial location. The ratio of the tapered shaft diameters at the location of the O-ring establishes the relative rotation rate of the drive rollers, and hence the extent of dimensional distortion of the produced copy. This can be varied continuously by moving the O-ring axially with respect to the tapered shafts, and this is accomplished by means of a movable carriage assembly that supports the O-ring.
REFERENCES:
patent: 760460 (1904-05-01), Leighton
patent: 856846 (1907-06-01), Cole
patent: 3115081 (1963-12-01), Bruce
patent: 3126809 (1964-03-01), Adams et al.
patent: 3374724 (1968-03-01), Torres
patent: 3445165 (1969-05-01), Dubbs
patent: 3861797 (1975-01-01), Nishida et al.
patent: 3967898 (1976-07-01), Klann
patent: 3992094 (1976-11-01), Adcock
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