6 - 15Chapter 6 Principle of Operation5.2 Paper FeederSince the Tray1 and Tray2 are functionally equivalent in terms of the Size Switch, ACTUATOR NOPAPER, 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, thedescription 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 forcefrom the MAIN MOTOR is transmitted via the CLUTCH ASSY PH to the ROLL ASSY FEED andROLL 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, theposition of the ROLL ASSY NUDGER drops accordingly. The lowered ROLL ASSY NUDGERpushes down the lock lever of the PLATE ASSY BTM, releasing it. The PLATE ASSY BTM ispushed up by a spring, and thus the paper is raised. The raised paper then raises the SUPPORTNUDGER. The SUPPORT NUDGER disengages from the lock lever of the PLATE ASSY BTM. ThePLATE ASSY BTM stops moving upward.Size SwitchA switch for setting the size of paper supplied from each Paper Cassette is mounted. A signalindicating the set size is transmitted as a voltage to the HVPS/MCU.ACTUATOR NO PAPERIf paper runs out in the Paper Cassette, the ACTUATOR NO PAPER drops and the flag of theACTUATOR NO PAPER that shielded the detection portion of the SENSOR NO PAPEER moves offthe detection portion. Thus, the light is transmitted.SENSOR NO PAPERThe presence or absence of paper in the Paper Cassette is detected by the position of theACTUATOR NO PAPER. This is converted into an electrical signal. If the detection portion isshielded (i.e., there is paper), /NO-PAPER 1/2 SNR ON signal is turned OFF.SENSOR REGIThe paper transported from the Paper Cassette pushes up the ACTUATOR B. The flag of theACTUATOR A optically unshields the detection portion of the SENSOR REGI. Thus, the passage ofpaper is detected.CLUTCH REGIThis electromagnetic clutch turns ON and OFF the driving force to the ROLL REGI RUBBER andROLL REGI METAL, to place the paper in position.ACTUATOR LOW PAPERWhen paper is low in the Paper Cassette installed in the Tray2, the arm of the ACTUATOR LOWPAPER is pushed up by the PLATE ASSY BTM. The flag of the ACTUATOR LOW PAPER thatshielded the detection portion of the SENSOR LOW PAPER moves off the detection portion. Thus,the light is transmitted.SENSOR LOW PAPERWhen paper is low in the Tray2 Paper Cassette, this is detected by the position of the ACTUATORLOW 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.
