| 摘要 |
<p>An internal worm drive has a worm gear (16) and a substantially hollow tubular worm (11) with an outer surface (12) and an inner surface (14). The inner surface has at least one internal worm thread (46) mating the worm gear (16). The axis of the worm gear is substantially perpendicular to the longitudinal axis of the tubular worm. Utilizing the tubular worm (11) with the threaded internal surface (14) in conjunction with the mating worm gear is an oscillating roller assembly (24) suitable for use as an ink roller in lithographic presses. A roller shell (44) having at least one internal thread (46) is circumferentially mounted around a bearing unit (28) such that its internal thread (46) engages the teeth of the worm gear (16). Rotation of the roller shell (44) causes the worm gear (16) to rotate, thereby causing cams (20) to alternately engage a shaft (26) at the opposite ends of a slotted space (31), thereby causing a bearing unit (28) and roller shell (44) to oscillate back and forth along the shaft (26).</p> |
