| 摘要 |
A rack and pinion medium roll support includes a support holder, a generally circular shape support shaft perpendicularly coupled to the support holder, and a rack and pinion mechanism, said rack and pinion mechanism comprising a pinion rotatably coupled to the support holder, an inner adjustable lever having an inner toothed rack meshed with the pinion, and an outer adjustable lever having an outer toothed rack meshed with the pinion at diametrically opposite end of the inner toothed rack of the inner adjustable lever, the inner adjustable lever being slidably coupled to the support shaft at an inner end and the outer adjustable lever being slidably coupled to the support shaft at an outer end, wherein the pinion is adapted to move the inner adjustable lever and the outer adjustable lever with approximately equal distance relative to each other for center adjusting a medium roll mounted on the support shaft between the inner adjustable lever and the outer adjustable lever.
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