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Chapter 6 Principle of Operation
5.2 Paper Feeder
Since the Tray1 and Tray2 are functionally equivalent in terms of the Size Switch, ACTUATOR NO
PAPER, and SENSOR NO PAPER, only the components of one tray are described here.
Since the ACTUATOR LOW PAPER and SENSOR LOW PAPER are not installed in the Tray1, the
description of these components applies to the Tray2 only.
150 FEEDER ASSY(Tray1) / 550/250 FEEDER ASSY(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 CLUTCH ASSY PH to the ROLL ASSY FEED and
ROLL ASSY NUDGER that are components of FEEDER ASSY. Thus, the paper is transported.
When the ROLL ASSY NUDGER picks up some sheets of paper and the paper gets low, the
position of the ROLL ASSY NUDGER drops accordingly. The lowered ROLL ASSY NUDGER
pushes down the lock lever of the PLATE ASSY BTM, releasing it. The PLATE ASSY BTM is
pushed up by a spring, and thus the paper is raised. The raised paper then raises the SUPPORT
NUDGER. The SUPPORT NUDGER disengages from the lock lever of the PLATE ASSY BTM. The
PLATE ASSY BTM stops moving upward.
Size Switch
A switch for setting the size of paper supplied from each Paper Cassette is mounted. A signal
indicating the set size is transmitted as a voltage to the HVPS/MCU.
ACTUATOR NO PAPER
If paper runs out in the Paper Cassette, the ACTUATOR NO PAPER drops and the flag of the
ACTUATOR NO PAPER that shielded the detection portion of the SENSOR NO PAPEER moves off
the detection portion. Thus, the light is transmitted.
SENSOR NO PAPER
The presence or absence of paper in the Paper Cassette is detected by the position of the
ACTUATOR NO PAPER. This is converted into an electrical signal. If the detection portion is
shielded (i.e., there is paper), /NO-PAPER 1/2 SNR ON signal is turned OFF.
SENSOR REGI
The paper transported from the Paper Cassette pushes up the ACTUATOR B. The flag of the
ACTUATOR A optically unshields the detection portion of the SENSOR REGI. Thus, the passage of
paper is detected.
CLUTCH REGI
This electromagnetic clutch turns ON and OFF the driving force to the ROLL REGI RUBBER and
ROLL REGI METAL, to place the paper in position.
ACTUATOR LOW PAPER
When paper is low in the Paper Cassette installed in the Tray2, the arm of the ACTUATOR LOW
PAPER is pushed up by the PLATE ASSY BTM. The flag of the ACTUATOR LOW PAPER that
shielded the detection portion of the SENSOR LOW PAPER moves off the detection portion. Thus,
the light is transmitted.
SENSOR LOW PAPER
When paper is low in the Tray2 Paper Cassette, this is detected by the position of the ACTUATOR
LOW PAPER and converted into an electrical signal. When the detection portion is shielded (i.e.
paper is high), /LOW PAPER SNR ON signal is turned OFF.
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