Vertical Transport And Registration; Introduction - Ricoh FT7770 Service Manual

30
April, '89

VERTICAL TRANSPORT AND REGISTRATION

1. Introduction

After paper feed, the pull-out rollers and relay rollers transport the paper
to the registration rollers.
then feed the paper to the drum at the proper time for image transfer.
- Pre-registration -
of the high copy speed,
Because
manage the variation of paper feed timing caused by the different paper start
(stack) positions.
feed sensor.
When paper reaches the paper feed sensor, the paper feed clutch turns off.
The paper waits at that point until the proper time,
turns on again to feed the paper to the pull-out rollers.
- Vertical Transport -
Soon after the leading edge of the paper passes through the pull-out rol-
lers, the paper feed clutch turns off.
rollers then transport the paper to the registration rollers.
The top relay rollers have a paper powder catcher to prevent the image
transfer section from getting dusty.
The registration rollers correct paper skew and
the registration rollers cannot completely
This problem is solved by pre-registration at the paper
The pull-out rollers and the relay
2-74
and then the clutch