Riso RP-255, Technical Manual

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MASTER MAKING SECTION
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A
5. Master Positioning Mechanism
The master-positioning operation is performed to bring the master to the master-positioning sensor
when the master-loading unit is opened/closed or after the master is cut during the master-making
process.
For master roll replacement
(1) Insert the leading edge of the new master roll to the master stopper gate [A], and close the master
loading unit.
Closing the master loading unit raises the master stopper gate.
The master loading unit switch monitors operations every 10 ms and determines that the master
loading unit is closed when the light path is blocked twice in succession. The master is then
checked by the master detection sensor [B].
(2) The thermal print head is lowered by the thermal pressure motor, and the write pulse motor and
load pulse motor operate to transport the master to the master positioning sensor [C].
(3) Once the light path to the master positioning sensor [C] is blocked by the master, the write pulse
motor alone operates in reverse to return the master 2 mm. The motor then stops and the thermal
print head is raised.
For master cutting
Steps (2) to (3) above are performed following master cutting.
A: Master stopper gate
B: Master detection sensor
C: Master positioning sensor
1508
1509
B C