Lexmark C920 Service Manual - Page 150

5056-XXX High-capacity feeder (HCF) Paper feed and separation mechanism The high-capacity feeder consists of a tray and paper transfer mechanisms. The paper feed and separation mechanism uses a friction roller separation and paper feed system with a non-contact magnet type maintenance-free torque limiter. When the paper feed clutch turns on, the paper feed roller shaft rotates, and the paper feed roller is driven with the one-way clutch. The call roller rotates with the relay gears to feed the top paper. The reverse roller rotates along with the paper feed roller. During paper feed, if two sheets feed, the reverse roller rotates by the torque limiter, returning the lower sheet. When the paper feed sensor (reflection type sensor) detects the paper, the pickup solenoid turns off to raise the call roller, transferring the paper to the registration roller. Registration operation When the paper feed motor rotates, the transfer roller is driven with relay gears. The reverse roller shaft rotates the gears on the paper feed clutch in the direction of the arrow and stops by the friction force of the paper feed roller. 3-38 Service Manual