Ricoh C249, Service Manual

Page: 378 / 486

MASTER FEED
C267 6-24 SM
6.5.7 MASTER FEED MECHANISM
Mechanism
Master feed motor [A] (stepper motor)
↓
Gears [B]
↓
Platen roller [C], master feed roller [D]
↓
Feeds the master (The thermal head makes an image on the master.)
Procedure
1. After the old master has been ejected, the drum stops at the master feed
position and the master clamper opens, ready to clamp the new master.
2. When the clamper is open, the tension roller releases and the master is fed to
the clamper on the drum. For details of the tension roller, see the next section.
3. After the clamper closes, the master feed motor feeds the master while the
drum rotates intermittently at 15 rpm.
4. The tension roller [E] keeps the master under tension. Without this roller, the
master would crease when the drum turns during wrapping the master around
the drum. This reduces the master making time.
5. The main motor turns off when the drum is at the master eject position (this is
the drum home position). Then the master feed motor turns off, and cutting is
done.
6. Springs press the thermal head against the platen roller.
[A]
[B]
[C]
[D]
[E]