Ribbon Advance Mechanism - Epson LQ-670 Service Manual

LQ-670 Service Manual

2.1.3 Ribbon Advance Mechanism

The ribbon advance mechanism consists of the rack mounted on the carriage guide frame, the pinion
mounted on the carriage unit, planetary gear, combination gear and ratchet RD. When the carriage unit is
moved right and left on the carriage guide shaft by the CR motor, the pinion is rotated by the rack and the
motive power is conveyed to the planetary gear. When the carriage unit moves to left, the pinion is rotated
by the rack, and the motive force is conveyed to the planetary gear. Also, when the carriage unit moves to
the right side, the driving force from the planetary gear is once conveyed into the combination gear, and
the combination gear drives the ratchet RD. Then the ratchet RD rolls up the ribbon.
Figure 2-3. Ribbon Advance Mechanism
2-5
Rev. A