94
x Pratemaking / Master Feed / Ejection Section
chap.2
xPlatemaking / Master Feed / Ejection Section
Make the master clump of the drum unit clump the master top end, performing platemaking on the master
with the thermal head. (In this machine, the master on the drum is ejected at the same time when platemak-
ing is performed.)
The master is conveyed to the drum unit via the platen roller and sponge rollers 1 and 2 by driving of the
stepping motor, while it is being processed in the head section. Sponge roller 2 is driven through the master
feeding clutch (electromagnetic clutch), and controls the amount of master conveyed to the master clump sec-
tion of the drum unit with the master feeding clutch ON / OFF.
The end mark sensor starts to detect when the end mark (black) section printed on the end of the roll master
is conveyed. "CHANGE MASTER" is displayed on the error display panel. The endmark sensor also detects
whether the master is conveyed properly through the sensor.
Cutter unit
Master feeding clutch
Sponge roller 1
Master clump
Sponge roller 2
Endmark sensor
Drum
Platen roller
Roll master
Thermal head Stepping motor
1. Description
Platemaking / Master Feed Section
Platemaking / Master Feed section
Master Clump Opening /
Closing Section
Master Ejiction Section
See page 107See page 109
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