Photocopying – Contact printing
Patent
1976-06-29
1978-08-08
Hix, L. T.
Photocopying
Contact printing
355 52, G03B 2768, G03B 2702
Patent
active
041053281
ABSTRACT:
An image-bearing medium (negative or positive) is located over and in close proximity to a light-sensitive film. During exposure, the film is moved in circular orbits parallel to the medium to cause spreading of image lines projected onto the film. To ensure uniform line spreading, the diameter of each successive circular orbit is increased toward a predetermined, maximum diameter, and the film is exposed during each orbit. The film is supported on a mobile table which is mounted, through a frictionless bearing, to a horizontal platform. The platform in turn is keyed to a vertical rotor. As the rotor is rotated by a drive motor, the table is caused to move in a circular orbit about the axis of rotation of the rotor. The diameter of the orbit, determined by the eccentricity of the axis of rotation of the horizontal platform with respect to the axis of rotation of the rotor is precisely controlled by a vertical rack and pinion mechanism. The position of the rack and pinion mechanism is determined by a stepping motor, and the diameter of each orbit is read out directly from a stepping motor encoder. In order to prevent rotation of the table during orbiting, the table rides on an intermediate carriage located between pairs of X- and Y-bearing shafts attached respectively to the bottom of the table and to a fixed frame member. The carriage and bearing shafts restrict the table to rectilinear movement.
REFERENCES:
patent: 3185026 (1965-05-01), Carlson et al.
patent: 3204544 (1965-09-01), Shannon
patent: 4029410 (1977-06-01), Richter
Baker Robert W.
Fairaizl Joseph H.
Pressley Joseph R.
Wasson Joe R.
Zorker Richard J.
Brady W. J.
Gardiner Donald A.
Hix L. T,.
Sadowsky Gersten
The United States of America as represented by the Secretary of
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