Canon BJC-55 Series, Service Bulletin

Page: 140 / 249

3.4 Paper Feed Mechanism
3.4.1 Outline of paper feed mechanism
In this printer paper is fed manually, one sheet at a time.
The paper feed mechanism of the printer is divided into the paper pick-up section and
printing/paper-delivery section.
These operations are driven by the paper feed motor which feeds the paper at a line
feed pitch of 1/360 inch.
a) Paper pick-up section
The paper pick-up section consists of the paper feed roller and the pinch rollers.
Paper is fed through the paper feed slot, one sheet at a time. When the paper is
detected by the paper end sensor and reaches the contact point of the paper feed
roller and the pinch rollers, the printer acknowledges the presence of paper. To
bring the paper to the print start position, press the
RESUME button. The paper
feed roller driven by the paper feed motor will feed in the paper to its set position.
b) Printing/Paper delivery section
The printing section consists of the paper feed roller, the pinch rollers on the platen
and the carriage. Each part is responsible for ensuring that a certain head-to-paper
distance is maintained.
The paper delivery operation section consists of the eject roller and spurs that
deliver the printed paper. Paper set to the print start position by the paper feed
roller and the pinch rollers will be printed over the platen and delivered by the eject
roller and the spurs. This printer has a sensor that detects if paper has been
delivered correctly. Do not attempt to back feed paper through the paper delivery
slot as this may damage the sensors.
Part 4: Technical Reference
BJC-50
4-30
Spurs
Printer Delivery
Sensor
Eject Rollers
Paper Feed Roller
Paper Sensor Pinch Roller
Paper Feeding
Direction
Figure 4-23 Paper Pass