Work unit for machine tool, with linear electric motor for axial movement of the spindle
AssigneeRiello Macchine Transfer SRL
InventorsAndrea Riello, Zeno Borsaro
Life of this patent
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Abstract
The invention concerns the work units for automatic machine tools in which a spindle (5) moves in translation and rotates with respect to a work axis (Z). More particularly in these units, in order to obtain the rotation/translation of the spindle, the latter is housed in a sleeve (3) that slides along the work axis (Z), with respect to which it is however free to turn.
Claims6
Work unit for machine tool, comprising a stationary outer body having an inner surface, a sleeve housed inside said body and adapted for sliding axially with respect to said body along a work axis of the unit, a spindle supported rotatably about the work axis with rolling bearings inside the sleeve and axially stationary with respect thereto, driving means for rotating the spindle, and a linear electric motor for moving axially the sleeve arranged between the sleeve and the outer body,
- wherein the linear electric motor is tubular and arranged coaxially with respect to the work axis of the unit, and
- wherein the linear electric motor comprises a primary winding arranged on the stationary outer body, and permanent magnets arranged on the sleeve, and
- wherein the driving means for the rotation of the spindle is housed inside the sleeve and comprises an electric rotary motor having a rotor arranged on the spindle and a stator arranged on the sleeve.
Dependencies are inferred from the claim text.