Oki 6E - Manual (Page 33)

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(b) Feeding
1 When hopping is completed, the registration motor turning in direction "b"
(CCW direction) drives the registration roller to advance the paper (in this case,
the hopping gear also turns, but the hopping roller is prevented from turning by
the one-way bearing).
2 The paper is further advanced, synchronization to the print data.
Image drum
Paper
Hopping
roller
Transfer roller
Registration roller
b