| 摘要 |
A device for driving an instrument (2) step-by-step, for example an axis, which device includes a driving part (1), a space (3) between the driving part and the instrument (2), and at least one ball/roller (4) which can have different positions (A, B, C) in the space. In the different positions the ball/roller is clamped between the driving part and the instrument or is not clamped, depending on the design of the space and/or the direction of the driving part. A guiding means can be arranged in order to force the ball/roller to the different positions.
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