Oki 18 Service Manual page 42

Roller idles freely by escaping the Planet Gear.
5 Printing starts after the paper turns off the Write Sensor.
(b) Hopping from the Front Feeder
1 Hopping
The Front Feeder Plate is normally locked at the lower position by the Release Lever activating the Micro Switch.
The top of the FF Cam which is attached to the end of the Front Hopping Shaft is normally located in the upper
position (0 to 30 degree : home position). Rotating the Hopping Motor in direction b (CCW) drives the Front Hopping
Shaft, the attached FF Cam and the Front Hopping Roller. When the FF Cam is rotated approx. 60 degrees, the
Release Lever is pushed and the Front Feeder Plate lifts up allowing the Front Hopping Roller to pick up a sheet of
paper. When the FF Cam is rotated approx. 180 degree, the Front Feeder Plate is pushed down and locked by the
Release Lever again. When the FF Cam is rotated approx. 275 degrees the paper is fed until the Inlet Sensor turns
off.
2 Aligning
After turning on the Inlet Sensor, the paper is fed a predetermined length and choked up to the wedge space formed
by the Registration Roller and the Pressure Roller to align the skew of the paper.
3 While the paper is fed from the Front Feeder Plate, the one way clutch of 1st Hopping Roller is idled and does not
drive the 1st Hopping Roller and the Sub Roller.
4 Feeding
After aligning the paper, the Hopping Motor is turned off and stops hopping. Then the Clutch (Registration) is turned
on and the Registration Roller starts to feed the paper. After the paper is fed, the Front Hopping Roller drives the
Front Hopping Shaft and the attached FF Cam with a small idle torque of the built-in one way clutch advancing to the
Release Lever. The one way clutch is slipped and the FF Cam is stopped at the upper position (home position). The
Front Hopping Roller idles until the paper clears the roller.