| 摘要 |
A combination comprises a first rack (314A), a second rack (314B) and a mover (218). The second rack (314B) is positioned substantially adjacent to the first rack (314A). The mover (218) includes a first rack gear (254), a second rack gear (256) and a differential adjuster (258). The first rack gear (254) moves along and between the first rack (314A) and the second rack (314B). The second rack gear (256) moves along and between the first rack (314A) and the second rack (314B). The differential adjuster (258) enables the first rack gear (254) and the second rack gear (256) to selectively rotate independently of one another. The first rack (314A) can be spaced apart from the second rack (314B) by a rack joint gap (368). While one of the rack gears (254, 256) is positioned adjacent to the rack joint gap (368), the first rack gear (254) and the second rack gear (256) can rotate independently of one another. The mover (218) can further include a first pinion gear (250) and a second pinion gear (252) that are mounted on the differential adjuster (258). The differential adjuster (258) enables the first pinion gear (250) and the second pinion gear (252) to selectively rotate independently of one another while maintaining smooth motion.
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