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Speed of copy sheet feeding is synchronized with photoconductive drum speed by releasing positive-driving feed rollers when the copy sheet becomes electrostatically attached to the drum.
English (United States)
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Page 1 of 2
Electrostatically Aided Paper Feed
Speed of copy sheet feeding is synchronized with photoconductive drum
speed by releasing positive-driving feed rollers when the copy sheet becomes
electrostatically attached to the drum.
Copy sheets introduced along curved guide 10 in the direction
indicated by the arrow, are initially gripped by the nip between
thrust roller 12 and idler roller 14. Idler roller 14 is retained in
nip engagement with thrust roller 12 by spring 15. The sheets are
pushed into engagement with the photoconductive surface of drum 18
until the paper electrostatically attaches to the surface of drum 18.
At this point, actuation of electromagnet or solenoid 20 (by means
not shown) results in pulling idler roller 14 away from thrust roller
12 so that the paper is pulled by the photoconductive drum 18 through
the electrostatic attraction between the paper and the
photoconductive surface, thus becoming independent of the paper drive
mechanism other than the drum. This guarantees copy sheet velocity
equal to the drum velocity. If desired, the timing can be such that
the copy sheet will have passed between transfer corona 22 and the
photoconductive surface before electromagnet 20 is actuated.
Structure other than a solenoid, such as a cam mechanism or the like,
can be employed to open the nip between rollers 12 and 14.
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