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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Cut Sheet/Continuous Sheet Switching Mechanism
Top Feed (for cut sheet paper)
When cut sheet paper is used, place the change lever in the Top Feed position.
As the platen turns, the platen gear causes the idle gear to rotate.
At this time, the rear and front pressure rollers press against the platen and feed the cut sheet.
The cut sheet detection lever enables the cut sheet detection switch, which is located on the main
control board. This places the printer in the cut sheet mode.
When cut sheet paper is placed between the platen and the paper chute, the printer automatically
feeds the sheet to the print start position.
Rear/Bottom Feed (for continuous feed paper)
When the continuous feed paper is used, either with the rear tractor, optional bottom tractor or
optional pull tractor, place the change lever in the Rear/Bottom Feed position.
When the change lever is placed in this position, the reset spring pushes the change gear. In this
position, the idle gear is engaged with the bottom tractor unit drive gear and the tractor gear. As
the platen turns, power is transferred from the platen gear - to the idle gear - to the change gear -
and to the push tractor shaft.