| 摘要 |
The invention relates to driving means for displacing two elongate members, the driving means comprising: a first set of at least a row of primary rollers and a row of secondary rollers; a second set of at least a row of primary rollers and a row of secondary rollers; wherein the first set is connected to a first member and the second set is connected to a second member; and wherein a belt serpentines between the primary rollers of the first set and the primary rollers of the second set along the length of the members and serpentines back between the secondary rollers of the first set and the secondary rollers of the second set.
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