Construction Of The Paper Feed Unit - Canon BJC 6000 - Color Inkjet Printer Service Manual

Part 4: Technical Reference

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
Pick-up Hook
Pick-up Guide
The auto-sheet feeder for this printer eliminates the need for a mechanical paper-
type 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.
Paper
Pick-up Corner
Stacked Paper
Plain Paper Feeding
Figure 4-24 Paper Feed Unit
Manual Paper Feeding
Envelope/Postcard Feeding
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BJC-6000