Konica Minolta bizhub 40p, Service Manual

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Theory of operation V er. 1.0 Dec. 2007 9. Media feed section (Tray 1 / Tray 2)
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bizhub 40P
Composition/Operation
D. Media guide (length)
• This can be adjusted to different paper sizes by making a forward or backward adjust-
ment. This makes contact with the rear end of the paper, and holds it in position in the
forward and rearward directions.
• The paper size to which the cassette is set is transmitted to the size switch 1/2/3 via the
same drive gears by the media guide (length). The three size switch units turns O N or
OFF respectively according to the transmitted paper size. The paper size is detected by
transmitting the O
N /OFF information to the Size Switch in the tray left. The types of
paper that can be automatically detected are as follows:
E. Lock lever and stopper
• These are at the rear end of the cassette (i.e. the exit path of the paper). When the cas-
sette is inserted into the printer, the protrusions on the Feeder trigger the mechanism
that depresses the Lock lever, slides the rack lock, and then simultaneously unlocks the
same drive gears of the stopper.
F. Media pressure plate
• The force pushing up the media pressure plate is supplied via the spring by unlocking the
Lock lever and stopper. When the media pressure plate is pushed up, the supplied paper
and specified gear assy touch each other.
G. Lever
• The lever is installed only on the tray2. The amount of paper remaining in the cassette is
indicated by the lever. As the amount of paper reduces, the media pressure plate rises
and the lever goes down in the lever guide.
9.3.2 Paper feeder
• Since the Tray1 and Tray2 are functionally equivalent in terms of the Size Switch, actua-
tor for media empty sensor, and media empty sensor, only the components of one tray
are described here.
• Since the actuator for near empty sensor and near empty sensor are not installed in the
Tray1, the description of these components applies to the Tray2 only.
A. Tray1 / Tray2
• This is a mechanism for supplying paper from the Paper Cassette into the printer. The
driving force from the main motor is transmitted via the media feed clutch to the feed
roller and pick-up roller that are components of feed drive section assy Thus, the paper is
transported.
• When the gear picks up some sheets of paper and the paper gets low, the position of the
gear drops accordingly. The lowered gear pushes down the lock lever of the media pres-
sure plate, releasing it. The media pressure plate is pushed up by a spring, and thus the
paper is raised. The raised paper then raises the support gear. The support gear disen-
gages from the lock lever of the media pressure plate. The media pressure plate stops
moving upward.
Type Size (mm
×
mm)
Letter S 215.9
×
279.4
Legal 14" S 215.9
×
355.6
Legal 13" S 215.9
×
330.2
Executive S 184.2
×
266.7
A4 S 210.0
×
297.0
B5 (JIS) S 182.0
×
257.0
A5 S 148.5
×
210.0