Ricoh VT3500, Service Manual

Page: 69 / 330

3.4 MASTER WRAPPING MECHANISM
When the magnetic clutch [B] is turned off, the reverse roller [A] stops.
However, since the feed rollers [C] turn continuously, the master continues to
be fed, causing the master to buckle. This buckle [E] is detected by the
master buckle sensor [D]. When the sensor turns on, the main motor turns on
at 10 rpm to rotate the drum. The main motor turns off when the sensor turns
off.
So, the master is fed by repeating the ON/OFF action of the master buckle
sensor. This mechanism prevents the shockwave from having an effect on
plotting when the drum pulls the master (for instance by jiggling the master
above the thermal head).
[D]
[C]
[B]
[A]
[A]
[D]
[C]
[E]
1 December 1993
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