Minolta Di551 Service Manual page 81

TRAY 1/2 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]
*2 Paper size detection
Length: When paper pushes the paper size
detection actuator, the paper size PS/2-
1/2-2 (PS6/PS12) and the paper size
PS/1-1/1-2 (PS5/PS11) turn ON. Thus,
the paper size is automatically deter-
mined according to the combination of
the ON/OFF states of these PSs.
Width: When the side guides of the tray are slid,
the rack gear of the side guide (front)
turns the paper size VR/1/2 gear. Thus,
the paper size is automatically deter-
mined according to the change in the
resistance value of the VR.
Side guide (front)
Coupling gear
Coupling
[Tray side]
Paper size VR gear
Rack gear
2-J-2
*3 1st 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/1 (PS1), the paper
feed PS/2 (PS7) turning it ON. The feed and
paper feed rollers remain ON for a specified time
after the actuation of the paper feed PS/1 (PS1)
and PS/2 (PS7) causing a paper loop to form
against the pre-registration rollers which are not
turning. In this way paper skew is corrected.
1 2
1. Feed roller
2. Paper feed roller
3. Paper feed PS/1(PS1), /2 (PS7)
4. Pre-registration roller
4
3