Lens and shutter positioning mechanism for variable-magnificatio

Details Lens and shutter positioning mechanism for variable-magnificatio Lens and shutter positioning mechanism for variable-magnificatio

1984-07-06

1986-12-16

Moses, R. L.

Photocopying

Including fiber optics

355 55, 355 71, G03G 1504

Patent

active

046293086

ABSTRACT:
Apparatus for repositioning the lens of a variable-magnification electrophotographic copier to change the image-side path length for a different magnification ratio and for concomitantly adjusting the shutter to compensate for the changed image-side path length. Actuation of a stepper motor rotates a pulley to tension a cable coupled to the lens, pulling the lens to the desired position of a linear track. A portion of the cable extends around a pulley having an axially projecting circumferentially extending ramp on one face. A follower engaging the ramp is coupled to slit-forming members adjacent to the photoconductor so that movement of the cable to reposition the lens produces a concomitant adjustment of the width of the slit to equalize exposure of the photoconductor over a substantially continous range of selected magnifications.

REFERENCES:
patent: 4125323 (1978-11-01), Ikeda et al.
patent: 4279497 (1981-07-01), Satomi

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