126
c Paper Feed Section
chap.2
(4)
Feed Tray (Elevator) Upper Limit Sensor
Description
Circuits
Operation
The feed tray (elevator) upper limit sensor senses decrease of the paper pile, and the upper limit position of
the feed tray. It does so by detecting the up/down motion of the paper feed shaft.
Sensing of feed tray upper limit
2When the feed tray rises, the paper in it presses the paper feed roller upward, making the paper feed shaft
lever (photointerrupter) rotate upwards about its fulcrum, until it no longer obstructs the sensor’s light
beam. Restoration of the sensor’s light beam signals that the paper tray has reached the upper limit, and
triggers stopping of the feed tray’s rise.
Sensing of paper decrease
2As printing progresses and the paper decreases, the paper feed roller gradually descends, until it obstructs
the sensor’s light beam. When this happens, the feed tray is raised until the light beam is restored.
If the light beam is not restored within 40 seconds of the sending of the RAISE FEED TRAY command,
error E002 (elevator lock) is displayed.
Feed tray (elevator) upper limit sensor
43SH0208E
Light green
63S00223
Paper
shaft lever
Paper
feed roller
Fulcrum
Paper tray upper
limit sensor
Paper
Screw
Paper feed
shaft lever
Paper
Paper
feed roller
Paper feed shaft
Paper shaft unit
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