Power operated chuck

The power-operated chuck for supporting cylindrically shaped workpieces which are to be machined by means of a machine tool in the areas of their free ends, the chuck comprising:

• a chuck body having a passage opening extending into its lengthways axis in order to accommodate a workpiece,
• a driving means for producing an actuation force, wherein the actuation force is absorbed by at least one actuating pin axially movably mounted in the chuck body,
• a guide hole disposed in said chuck body, the guide hole being angled in a direction of a free end of the workpiece, wherein an actuating pin is inserted in the guide hole, and
• at least three centring jaws, each mounted in a guide groove provided in the chuck body, and mounted so as to move radially in the direction of the workpiece, wherein each centring jaw interacts in a driving arrangement with one of the actuating pins,
• wherein an anti-friction bearing comprising a roller or a plain bearing is provided on an end of the driving means facing the actuating pin, a contact surface being provided on the free end of the actuating pin and extending at a right angle to the lengthways axis of the chuck body, wherein the contact surface and the anti-friction bearing interact such that the actuation force of the driving means is transferred from the anti-friction bearing onto the contact surface of the actuating pin in an axial direction, and simultaneously a relative movement vectored at a right angle to the lengthways axis of the chuck body is released between the contact surface of the actuating pin and the anti-friction bearing;
• wherein a stabilisation sleeve is provided between the actuating pin and the guide hole, and wherein the length of the stabilisation sleeve is shorter than the length of the actuating pin.

The power-operated chuck for supporting cylindrically shaped workpieces which are to be machined by means of a machine tool in the areas of their free ends, the chuck comprising:

• a chuck body having a passage opening extending into its lengthways axis in order to accommodate a workpiece,
• a driving means for producing an actuation force, wherein the actuation force is absorbed by at least one actuating pin axially movably mounted in the chuck body,
• a guide hole disposed in said chuck body, the guide hole being angled in a direction of a free end of the workpiece, wherein an actuating pin is inserted in the guide hole, and
• at least three centring jaws, each mounted in a guide groove provided in the chuck body, and mounted so as to move radially in the direction of the workpiece, wherein each centring jaw interacts in a driving arrangement with one of the actuating pins,
• wherein an anti-friction bearing comprising a roller or a plain bearing is provided on an end of the driving means facing the actuating pin, a contact surface being provided on the free end of the actuating pin and extending at a right angle to the lengthways axis of the chuck body, wherein the contact surface and the anti-friction bearing interact such that the actuation force of the driving means is transferred from the anti-friction bearing onto the contact surface of the actuating pin in an axial direction, and simultaneously a relative movement vectored at a right angle to the lengthways axis of the chuck body is released between the contact surface of the actuating pin and the anti-friction bearing;
• wherein a sliding pad is provided between the driving means and the actuating pin, wherein two guide openings disposed in the sliding pad are arranged at a distance from one another and extend parallel with one another, and wherein projections formed on the driving means and the actuating pin are inserted into a corresponding guide opening, and are movably mounted therein.

A power-operated chuck for supporting cylindrically shaped workpieces which are to be machined by means of a machine tool in the area of their free ends, the chuck comprising:

• a chuck body having a passage opening extending into its lengthways axis in order to accommodate a workpiece,
• a driving means for producing an actuation force which is absorbed by at least one actuating pin in an axially movable mounting in said chuck body,
• a guide hole disposed in said chuck body, said guide hole being angled in the direction of a free end of the workpiece to be machined, and an actuating pin inserted therein, and
• at least three centring jaws, each mounted in a guide groove provided in said chuck body, and mounted so as to move radially in the direction of the workpiece, each of which interacts in a driving arrangement with one of said actuating pins,
• an anti-friction bearing comprising a roller provided on a free end of the actuating pin facing the driving means, a contact surface disposed on a free end of said driving means facing the actuating pin running at right angles to the lengthways axis of said chuck body, said contact surface and said roller of said anti-friction bearing interacting such that an actuation force of said driving means is transferred via its contact surface in an axial direction onto said roller of said anti-friction bearing or the plain bearing attached to said actuating pin, and simultaneously a relative movement vectored at right angles to the lengthways axis of said chuck body is released between the contact surface of said driving means and said roller of said anti-friction bearing or the plain bearing of the actuating pin.