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Part 4: Technical Reference
BJC-5000
3.5.2 Sheet feeder structure
This printer has no mechanical paper selection lever on the cut sheet feeder. If the
paper meets the required specifications, it can be fed without carriage position
adjustment etc. according to the paper thickness.
The paper is loaded in the cut sheet feeder under the condition where the two leading
edge positions and left corner are caught by the pick-up corner and pick-up hook.
The pick-up roller starts rotating when the paper feed motor drives the sheet feeder
gear and the printer starts printing.
Paper such as plain paper is fed when it is caught by the pick-up corner and pick-up
hook and then pushed into the paper feed section. When thick paper such as
envelopes and postcards is fed, the paper is stiffer than the return force of the pick-up
hook spring and pick-up corner spring. Therefore, the pick-up hook and pick-up
corner are pressed down to feed the paper.
Initial position of the pick-up roller is detected when the flag is sensed by the pick-up
roller sensor of the photo interrupter on the logic board.
When paper is sensed by the paper end sensor, it is fed automatically until it reaches
the print starting position.
If paper is not sensed even when the paper feed operation is executed, a paper not
loaded or paper jam error will occur.
During manual feeding, a user must insert a paper through the manual feeding slot
until it reaches the position where the paper end sensor detects the paper. In the
manual feed mode, the paper passes through a different paper path from that used by
the automatic paper feed mode of the cut sheet feeder. This makes it possible to give
priority to manually fed paper, even when paper is loaded in the cut sheet feeder.
Paper pushed into the paper feed section is fed to the print starting position after it
has been sensed by the paper end sensor.
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