Ricoh G179 Service Manual page 554

No. Component
Fold Bottom Fence HP
S28
Sensor
S29 Fold Plate HP Sensor
Fold Plate Cam HP
S30
Sensor
S31
Fold Unit Exit Sensor
S32
Stack Present Sensor
Lower Tray Full
S33
Sensor - Rear
B804/B805
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Controls the movement of the bottom fence in the
folding unit using pulse counts based on the size of the
paper selected for the job to position the stack correctly
for feeding.
Along with the fold plate cam HP sensor (S30) this
sensor controls the movement of the fold plate . The fold
plate has arrived at the home position when the edge of
the plate enters the gap of this sensor.
Along with the fold plate HP sensor (S29), this sensor
controls the movement of the fold plate. The actuator
mounted on the end of the roller that drives the folder
plate forward and back makes three full rotations, i.e.
the actuator passes the sensor gap twice and stops on
the 3rd rotation and reverses. This accounts for the left
and right movement of fold plate.
1) Detects the folded edge of the stack as it feeds out
from the nip of the fold rollers, stops the rollers, and
reverses them so the fold feeds back into the nip, 2)
when the folded booklet finally emerges from the nip of
the fold rollers, detects the leading and trailing edge of
the booklet to make sure that it feeds out correctly.
This sensor determines whether there is paper at the
turn junction gate when the machine is turned on. If a
stack is present, this triggers a jam alert. (This sensor
performs no dynamic function such as pulse counting,
etc. It only detects whether paper is at the top of the
folding unit when power its turned on.)
This rear sensor is the lower sensor of the lower tray full
sensor pair. Two actuators are attached to the actuator
arm that touches the top of stapled and folded booklets
as they feed out. The on/off combinations of the two
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Component Layout
Function
SM