Shutter Operation - Sharp AR-FN8 Service Manual

CHAPTER 2 FINISHER UNIT BASIC OPERATION
I.

Shutter Operation

Before the tray on which sheets are output is shifted by the tray lift motor (M5) to another tray,
the finisher controller PCB closes the shutter mounted on the delivery slot before moving the tray,
protecting the existing stack on the tray from the delivery slot and intrusion of hands.
The shutter moves up (to close) when the second feed motor (M8) rotates counterclockwise,
and is held in position when the motor stops. When the second feed motor rotates counterclockwise
once again, it moves down (to open) to enable delivery.
When the shutter is held at the up position, claws slide out of the swing guide to engage the
back of the shutter. This way, the existing slack and the swing guide engage while the tray is
moved, preventing the guide from opening. The claws slide in when the shutter is moved down to
release the engagement.
The upward movement of the shutter is monitored by the shutter closed detecting switch (MS4),
and the downward movement is monitored by the shutter open sensor (PI5).
See the following diagrams for how these operations take place.
1) The second feed motor rotates counterclockwise to move the shutter up.
2-42
M8
Second feed motor
Figure 2-241