Feeding And Delivering - Sharp AR-FN8 Service Manual

CHAPTER 2 FINISHER UNIT BASIC OPERATION
C.

Feeding and Delivering

1. Outline
The finisher moves copies arriving from the host machine to the delivery tray, stapling tray, or
the saddle stitcher unit (Saddle Finisher) according to the mode of delivery. On the stapling tray,
the copies are subjected to job offset or stapling as instructed by the host machine.
The first feed motor (M1), second feed motor (M8) and inlet feed motor (M9) are stepping
motors, and delivery motor (M2) is a C motor. These motors are controlled by the microprocessor
(CPU) on the finisher controller PCB, and rotate either clockwise or counterclockwise.
The paper paths are equipped with the following four sensors for detection of paper (arrival,
passage):
Inlet sensor (PI1)
elivery sensor (PI3)
Stapling tray sensor (PI4)
Buffer path paper sensor (PI14)
In addition, each delivery tray is equipped with a sensor designed to detect the presence/ab-
sence of paper on it.
No.1 tray paper sensor (PI11)
No.2 tray paper sensor (PI12)
If a copy fails to reach or move past each sensor within a specific period of time, the finisher
controller PCB identifies the condition as a jam, and stops the ongoing operation and at the same
time informs the host machine of the condition. When all doors are closed after the paper jam is
removed, the buffer path inlet paper sensor (PI17) checks whether or not copies are being detected
in addition to the above four sensors (inlet sensor, delivery sensor, stapling tray sensor and buffer
path paper sensor). If the sensors detect a copy, the finisher unit judges that paper jams have not
completely been removed, and sends the paper jam removal signal to the host machine again.
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