| 摘要 |
PCT No. PCT/SE97/00651 Sec. 371 Date Oct. 15, 1998 Sec. 102(e) Date Oct. 15, 1998 PCT Filed Apr. 17, 1997 PCT Pub. No. WO97/40295 PCT Pub. Date Oct. 30, 1997In a device for driving an instrument (2), for example an axle, step-by-step, the 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 different positions. |
