Casio MD-910, Техническое руководство

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(3) Paper feeding with LF (line feed) mechanism
In paper feeding with LF mechanism, only the protrusion pressing down mechanism is different
from that of paper feeding without LF mechanism.
Two cotter pins are set on the outside of the PF cam gear and turn together with the PF cam
gear. The cotter pins are always exerting a force to uncoil but are restrained by the return ring.
One part of the return ring is thin, so that when the cotter pin passes through this thin part while
rotating, it springs out of the return ring.
When performing paper feeding without LF, no cotter pin spring is required, so the armature
assembly is inserted in the thin part of the return ring instead. The armature assembly is linked
with the paper feed solenoid.
When performing paper feeding with
LF, the paper feed solenoid turns ON
and the armature assembly is de-
tached from the return ring.
The PF6D cam is set on the outside
of the return ring and the driving force
of the PF cam gear is transmitted by
the cotter pin spring.
As the PF6D cam turns, the outer pro-
trusion (part B) of the sector gear as-
sembly is lowered and the paper feed
roller rotates in the same manner as
during paper feeding without LF
mechanism. At this time, the PF6D
cam is larger than the cam inside the
PF cam gear, so the rotation of the
paper feed roller is 6 dots/line, i.e., 2
more dots per line than with paper
feeding without the LF.