Rice Lake Okidata 320-390-420 Turbo - Service Guide - Manual (Page 37)

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Service Guide ML320/321Turbo
Chapter 2 Operation Description
2.2.5 Paper Feed Operation
Paper is fed by turning the platen and the pin tractor, which is driven by the LF pulse motor.
The paper feed mechanism consists of the following:
(a) Pulse motor with gears
(b) Decelerating gear
(c) Platen
(d) Tractor feed unit
(e) Pressure roller
(1) Cut sheet and continuous sheet switching mechanism (See Figure 2-8.)
Three different paper paths can be selected and set by the change lever.
(a) TOP (for cut sheets)
When the cut sheet paper is used in the manual mode or fed by the CSF (option), set the change
lever at the position marked TOP.
Operation
The driving force of the platen gear (R) is transmitted to the idle gear by setting the change lever
to the TOP position. However, this causes the idle gear to be disengaged from the change gear,
leaving it free.
At this time, the pressure rollers (at the rear and the front) are pressed securely to the platen to
feed the sheet. At the same time, he cut sheet detection lever turns on the cut sheet detection
switch, to confirm to the control board that you are in the cut sheet mode.
In the cut sheet mode, the control board automatically feeds the sheet up to the print start position
after pausing for the wait time stored in the menu.
(b) REAR (Continuous sheet from push tractor)
When the change lever is set to REAR position, the change gear is engaged with the idle gear
and the tractor gear to transmit the rotation of the platen to the push tractor shaft, and the paper is
fed from the push tractor.
At the same time, the switch lever turns on the rear switch, to inform the control board that you are
in the continuous sheet mode.
(c) BOTTOM (Continuous sheet from bottom feeder) (option)
When the change lever is set in the BOTTOM position, the rotation of the platen is transmitted to