| 摘要 |
<p>Drive mechanism for a feed roller (12) in a printer, comprising a worm wheel (14) connected to the feed roller (12) and forming a rotary unit (10) therewith, a worm (20) engaging said worm wheel, a motor (22) driving said worm, an encoder (24) detecting increments (´Õ) in an angular position of the worm, and a servo controller (48) for the motor, wherein the rotary unit (10) has a sync mark (36) defining a reference position (Õ0), a reference detector (38) is provided for detecting the sync mark, and said servo controller (48) has access to a calibration memory (50) and is adapted to output a calibrated motor control signal (C) dependant on the angular position of the feed roller (12) as determined from said reference position (Õ0) and said worm angular position increments (´Õ).</p> |
