| 摘要 |
For a control of machine-tool feeds, in particular reciprocating feeds, there is designed a power gear assembly comprising a first driving member, which is coupled with basic drive means and a second driving member, which is coupled with second drive means for producing a rotation of the second driving member with respect to the first driving member. The first and the second driving members comprise a motion screw (1) and a nut (2). The nut (2) is coupled with the second drive means by a gearing having one wheel engaged with a guiding rod (12) which is coupled to the second drive means, the wheel being seated on the guiding rod (12) displaceably. The second drive means engages with the basic drive means by means of at least one pair of non-slip gears, the gears of the said pair being intercoupled by a releasable clutch (25, 35, 45). |
