Machine tool with swiveling head
AssigneeCentre d'Etudes du Fraisage
InventorMichel Sachot
Life of this patent
Estimating the term…
Abstract
A swivel head swivels on its support along a plane face that is perpendicular to the axis of rotation. The face has the shape of a movable disk that slides on a stationary disk. The movable disk is rotated by means that ensure centering with a predetermined clearance. The stationary disk is pierced by two diametrically opposite bores and the movable disk is pierced by at least one pair of diametrically opposite bores with the same diameter and with the same distance between centers, and located at the same distance from the center, within the clearance. The positions of a pair of bores may be generated from those of another pair, by rotation of predetermined angle. The support features means for inserting, across the two disks, two expandable rings, for expanding them, and for retracting them.
Claims24
In a machine tool of the type having a spindle-carrying head which swivels on a support about an axis of rotation, the combination for achieving precise rotational orientation of said head, comprising:
- a planar bearing surface on the head having at least one pair of diametrically opposed head bores;
- a planar bearing surface on the support having a pair of diametrically opposed bores with diameters and center-to-center separations identical to those of each of the pairs of head bores;
- means for rotatably coupling the head and support for relative rotation so that the head bearing surface slides against the support bearing surface during rotation and is rotatable thereon and being centered therein with a predetermined clearance;
- an expandable ring member dedicated to each support bore, each ring having an expanded state and a contracted state, the exterior diameter of said ring being at least equal to the internal diameter of the respective bore in the expanded state and being less than said internal diameter in the contracted state;
- and
- means for mounting each of said ring members for translational movement within and between the respective support bore and a head bore aligned therewith, said ring members being contracted during said movement and being expanded while within aligned support and head bores to compensate for said clearance and locate said head with respect to said support within the limits of said clearance.
In a machine tool of the type having a spindle-carrying head which swivels on a support about an axis of rotation, the combination for achieving precise rotational orientation of said head, comprising:
- a plane bearing surface on the head having a plurality of head bores in a predetermined pattern;
- a plane bearing surface on the support having a plurality of bores constructed, as to their diameters, their center-to-center spacing, and their distance from said axis of rotation, so that at least two support bores align with respective head bores in at least two different rotational positions of the head;
- means mounting said head for rotation with respect to said support so that said head bearing surface slides against said support bearing surface during rotation, said mounting means being constructed to provide a predetermined amount of movement normal to said axis of said head with respect to said support;
- and
- at least two expandable ring members dedicated to support bores which align with head bores, each ring member having an expanded state and a contracted state, the exterior diameter of each said ring member being at least equal to the internal diameter of the respective bore in the expanded state and being less than said internal diameter in the contracted state to compensate for said clearance and locate said head with respect to said support within the limits of said clearance.
Dependencies are inferred from the claim text.