Ricoh VT3500, Service Manual

Page: 61 / 330

1. 0
≤
L
≤
7 mm (L=0, 1, 2, ..., 7)
The image of the original is moved backwards by advancing the master feed
timing during the master making process. First, the print must have a 10
millimeters blank margin at its leading edge. This is to let the machine easily
peal the print off the drum. To allow for the margin, a 10 millimeters margin
must also be made on the master; so plotting on the master starts from the
line (on the master) that corresponds to the first line on the print immediately
following the 10 millimeters margin. Prints and master will always have this
margin when the value of L is between 0 and 7 millimeter
If the shifting length L is +7 millimeters, the master starts being fed and the
master plotting signal is energized when the original is fed 8.5 millimeters
(after the drum stops rotating). The image is scanned from 3 millimeters after
the leading edge of the original. Then the scanned image is plotted on the
master from the line (on the master) that corresponds to 10 millimeters from
the leading edge of the print.
The master plotting signal is de-energized when the original scanning for the
plotting area is finished. Then, the master feed motor turns off.
410 mm(Max.)
15.5 mm
218.5 in Drum Rotation
High Speed
8.5 mm
20.5 mm
Second Drum Position
Sensor
[Master Making Process]
Main Motor Reversing
Original Registration
Sensor
Original Transport
Motor
Master Feed Motor
Original Scanning
Signal
Master Plotting Signal
15.5 mm
3 mm
15 mm
8.5 mm
Scanning Signal
Start Position
Exposure Glass
CCD Scan Line
Original Registration
Sensor
Original
Guide Plate
Plotting Signal
Start Position
1 December 1993
2-25