Minolta Di551 Service Manual page 89

TRAY 3 PAPER FEED UNIT
b) Lowering of tray
When the paper feed tray is pulled out, the
coupling shaft of the tray is disengaged from
the coupling gear of the tray up drive motor on
the main body side, allowing the up/down
plate in the tray to fall down by its own weight.
[Main body side]
Coupling
*2 Paper size detection
Length: When paper pushes the paper size
detection actuator, the paper size PS/1-
3 (PS17) and the paper size PS/2-3
(PS18) turns ON. Thus, the paper size is
automatically determined according to
the combination of the ON/OFF states of
this PS.
Width: When the side guides of the tray are slid,
the rack gear of the side guide (front)
turns the paper size VR3 gear. Thus, the
paper size is automatically determined
according to the change in the resis-
tance value of the VR.
Side guide (front)
Coupling gear
[Tray side]
Paper size VR gear
Rack gear
*3 First paper feed paper loop mechanism
When paper feed starts, paper is fed to the pre-
registration roller by the feed roller and paper
feed rollers. The fed out paper operates the
actuator of the paper feed PS/3 (PS13), turning
it ON. The feed and paper feed rollers remain
ON for a specified time after the actuation of the
paper feed PS/3 (PS13) causing a paper loop to
form against the pre-registration rollers which
are not turning. In this way paper skew is cor-
rected.
1
1. Feed roller
2. Paper feed roller
3. Paper feed PS/3(PS13)
4. Pre-registration roller
2-K-2
4
3
2