Ricoh Gestetner 5450, Service Manual, Page: 56 / 315

MASTER FEED 1 July, 1998
2-28
2.4.2 MASTER SET MECHANISM
Master Roll Set
The master set sensor [A]
checks to see if the master roll
was installed properly. After
inserting the master making unit,
the sensor detects the leading
edge of the master. The master
is fed in until the leading edge
reaches the master feed control
roller.
Master Feed and Stop Control (Edge Detection)
While the master is being fed
after a roll is put in the machine,
the master edge sensor [B]
checks the leading edge of the
master.
The master is fed 18 mm more
after the master edge sensor [B]
is activated. It has now been
caught by the master feed
control roller [C] and it stops.
This is the stand-by position for
master making.
While the master is fed, the
platen roller pressure, which is
used to press the master against the thermal head, is repeatedly applied and
released using the platen pressure release mechanism. This prevents master skew
or creasing after a roll has been put in the machine. A later section will describe
this process in more detail.
C229D102.WMF
C229D103.WMF
[A]
[C]
[B]