Canon Color Bubble Jet BJC-5000 Series, Руководство по обслуживанию

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4-33
BJC-5000
Part 4: Technical Reference
1) Paper feed mechanism
The paper feed mechanism can supply paper in two ways: automatically from the
cut sheet feeder and manually from the manual feeding slot. The built-in cut sheet
feeder is driven by the paper feed motor. Paper is stacked in the sheet feeder and
fed automatically. Even postcards and envelops can be fed automatically without
mechanical operation (a user does not have to operate the paper selection lever).
When paper is loaded in both the cut sheet feeder and manual feeding slot, priority
is given to the manual feeding slot.
When the paper is sensed by the paper end sensor of the photo interrupter, it is fed
automatically by the paper feed roller until it reaches the starting position for
printing on the platen.
The paper feed is controlled during printing by controlling the rotation speed of the
paper feed roller.
After printing, the paper is delivered out by the eject roller.
2) Automatic printhead and paper clearance adjustment function
The paper feed roller and eject roller are pulled up by the coil spring from a lower
position to a higher position toward the pressure roller and spur respectively, a
consistent clearance is maintained between the printhead face and paper regardless
of the paper thickness.
As a result this printer allows a user to print without switching the carriage position
according to the print paper thickness.
Carriage Shaft
Pressure Roller
Platen
Paper Feed Roller
Carriage
Spur
Transmission Roller
Eject Roller
Spur Cleaner
Paper Feed Roller Bearing
Coil Spring
Sheet Feeder
Figure 4-24 Automatic Printhead and Paper Clearance Adjustment