Changing the paper size or thickness causes multiple adjustments for the operators to make.
Fortunately, these adjustments are all done at the control panel.
Once the sheet stack is loaded into the press the adjustment to the following components are:

• Sheet steadiers, pile height regulator, and side guide - insures the sheets are properly stacked and aligned.
• Separator brushes and fingers - prevents “double sheeting” where multiple sheets are fed at the same time.
• Rear pickup suckers and forwarding suckers - picks up the individual sheets of paper.
• Air blast nozzles - flutters up and separates the sheet of paper from the stack.
  

Pic 1.06
This is a movie of the paper feeder. This is a stream style feeder.

Pic 1.07
The knobs shown above adjust the suction pressure of the stream feeder.