Epson WF-7820, WF-7830, WF-7840, EC-C7000 Series Service Manual Page 21-40

EPSON WF-7820 Series, WF-7830 Series, WF-7840 Series/EC-C7000 Revision A Operating Principles APG Mechanism Operating Principles 21 Confidential 1.2.2 Operating Principles 1.2.2.1 Driving Path The APG Change Gear in the APG Unit transmits drive force of the PF Motor to the APG Cams by the engaging of the gear train that transmits drive force from the PF Motor and the gear that rotates the APG Cams on the ends of the CR Guide Shaft. This APG Change Gear is normally in an disengaged state with each gear train by the compression spring. This prevents the PG from being changed when conveying paper because the PF Motor drives the PF Roller and EJ Roller. To change the PG, push the APG Change Gear by moving the CR Unit to the Full side. By doing this, drive force of the PF Motor switches to a state to be transmitted to the APG Cams by each gear train and the APG Change Gear engaging. The PG change is detected by the APG Sensor. The output of the APG Sensor is High when the flag on the APG Cam Left is in the slit in the APG Sensor. Figure 1-13. Driving Path PF Motor PF Roller PF Timing Belt EJ Roller Center APG Cam Left/ CR Guide Shaft APG Change Gear Full side Combination gear A Spur gear1 Combination gear B Spur gear 2 Combination gear D Combination gear C APG Change Gear APG Cannot Switch The gear train that transmits drive force from the APG Change Gear and the PF Motor, and the gear that rotates the APG Cams on the ends of the CR Guide Shaft are not engaged with the tension of the spring. APG Can Switch Drive force from the PF Motor is transmitted to the APG Cams on the ends of the CR Guide Shaft by the CR Unit pushing the APG Change Gear. CR Unit APG Sensor Top
Page 1 of 20

Epson WF-7820 Series Service Manual Page 21-40
Epson WF-7830 Series Service Manual Page 21-40
Epson WF-7840 Series Service Manual Page 21-40
Epson EC-C7000 Series Service Manual Page 21-40