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Part 4: Technical Reference
3.4.2 Carriage structure
1) BJ cartridge attachment section
The cartridge holder moves with the locking lever which secures the BJ cartridge
into the carriage.
When a BJ cartridge is secured into the carriage, the ribbon cable signal contacts
are pressed against the bubble jet head signal contacts, enabling signals to be
transmitted from the logic board.
2) Carriage driver
The stepping-type carriage motor drives the carriage horizontally across the paper
with the carriage belt. After the photo interrupter's home position sensor behind the
carriage detects the home position edge as the initial position, the carriage is
controlled by the stepping pulse sent to the carriage motor.
The carriage motor is driven by a one to two-phase exciter at a fixed current.
A mechanical shift occurs during the bi-directional non-continuous printing in the
paper feed direction. After the bi-directional carriage shift for each mode, the
slightly-off timing of the detected home position edge is adjusted automatically by
delaying the ejection of ink. The slightly-off timing of the detected home position
edge is adjusted with software and thereby corrected automatically. During the
initial operation, HQ mode is corrected. For the other modes, the misalignment is
measured and corrected before printing starts.
3) Paper thickness setting
If envelopes or thick paper is fed for printing, they will rub against the head face
causing possible damage and paper contamination. This can be prevented by using
the proper paper thickness setting.
The gap between the head and paper must be set to the optimum setting (one of two
settings) to match the thickness of paper being fed. This gap is adjusted by
changing the angle of the carriage guide frame and the carriage attachment angle.
The gap between the platen and head thereby changes.
Right Position
Left Position
Figure 4-16 Paper Thickness Adjustment
4-20
Left
Right
BJC-2000
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