Fan Shutter Mechanism

Just before feed (first sheet of paper only)
The float/separation fan, side fan, suction fan shutters open, but the return fan shutter does not.
The feed belt [A] stops.

*The numbers in this column refer to the numbers in the diagram above.

Feed starts
After feed starts, the float/separation fan shutter and side fan shutter are closed, and the return fan shutter is open. The suction fan shutter is also open, to hold the top sheet of paper against the belt.
After 60 msec of suction, the feed belt starts to move.

*The numbers in this column refer to the numbers in the diagram above.

Shutter open timing count starts
The feed sensor [A] turns on and the feed belt [B] stops. Then the suction fan shutter is closed.
When the feed sensor turns on, the count starts to determine when the trailing edge passes the float/separation fan shutter opening position [C].

*The numbers in this column refer to the numbers in the diagram above.

Arrives at the float/separation fan shutter opening position
When the counter determines that the trailing edge arrives at the float/separation fan shutter opening position [A], the float/separation shutter opens to assist with the suction of the next sheet of paper.
The return fan shutter is closed so that it does not affect the air from the float fan.
The feed belt [B] stops.

*The numbers in this column refer to the numbers in the diagram above.

Arrives at the suction fan shutter opening position
When the trailing edge of the paper arrives at the suction fan shutter opening position [A], the suction fan shutter opens.
The feed belt [B] is stopped.

*The numbers in this column refer to the numbers in the diagram above.