Eccentric positioning device for tools and workpieces

A device for eccentrically moving and positioning a tool, or a workpiece, or a measuring instrument in connection with machining or measuring operations, for example, the device comprising in combination:

• a stationary headstock, serving as a housing for the device;
• an outer drum received inside a large bore in the headstock, in a rotatable bearing relationship therewith;
• a smaller inner drum received inside a matching bore in the outer drum, in a rotatable bearing relationship therewith, the rotational axes of the outer and inner drum being arranged in parallel alignment, but eccentrically offset from one another by a first eccentricity;
• a carrier member for said tool, workpiece, or measuring instrument received inside a matching bore in the inner drum in an axially movable relationship therewith, the rotational axis of the inner drum and the longitudinal axis of the carrier member being likewise arranged in parallel alignment, but eccentrically offset from one another by a second eccentricity;
• means for rotating the outer drum in relation to the headstock;
• means for rotating the inner drum in relation to the outer drum, so that the carrier member axis can be moved to any position within an annular positioning range whose small radius equals the difference between the two eccentricities and whose large radius equals their sum;
• and
• means for axially moving the carrier member.