Canon BJC 6000 Service Manual - Page 102

Part 4: Technical Reference BJC-6000 3.4.2 Construction of the paper feed unit This printer's paper feed unit is mechanically comprised of the pick-up unit, paper feed unit, and the paper eject unit. a) Pick-up unit Pick-up Roller Paper Pick-up Hook Pick-up Corner Pick-up Guide Stacked Paper Manual Paper Feeding Plain Paper Feeding Envelope/Postcard Feeding Figure 4-24 Paper Feed Unit The auto-sheet feeder for this printer eliminates the need for a mechanical papertype selector provided the paper satisfies the specifications. As a result, no mechanical selector lever is in the auto-sheet feeder unit. The stacked papers are locked in two places with hooks at the paper's leading edge to prevent paper from skewing or warpage that could cause misfeeding. Paper feed operation starts when, driven by the paper feed motor, the pick-up roller starts turning. The two hooks at the paper's leading edge will be unlocked, allowing the paper to be loaded onto the sheet feeder and hooked on the separator by one corner. When the pick-up roller starts turning, the paper, with one corner suppressed by the paper separator, will be separated and fed one sheet at a time to the paper feed roller. If the paper is a resilient type such as an envelope/thick paper (postcards, etc.,), it pushes the paper separator over as it gets fed because the paper's resilience is greater than the paper separator spring's return force. 4-30