| 摘要 |
Device characterised in that it comprises: a worm 1 which can move axially and which is connected to a means 7 for driving it in continuous rotation, a gearwheel 2 meshing with this worm and connected to a device 4 for being driven with a step by step movement, a first single-acting cylindrical cam 9 in which the circular cam surface 91 is held pressed against a first stop 11, the inclination of a part of this cam surface 91 corresponding to that of the threads of the worm, one of the elements - single-acting cylindrical cam or stop - being stationary, the other being mechanically connected to the worm in axial displacement and in rotation. <IMAGE>
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