Chuck

Abstract

In a chuck (1) by means of which workpieces (2) are supported individually and centered for machining by a machine tool, the chuck comprising: a chuck body (3), four clamping jaws (5, 6, 7, 8) which are radially movably mounted on the chuck body (3) and are each arranged in pairs in an X or Y plane, and a drive piston (9) which is mounted in the chuck body (3) so as to be axially movable and which is drivably coupled to the four clamping jaws (5, 6, 7, 8) via a helical surface or helical gearing (10) worked on the drive piston (9) and the respective clamping jaws (5, 6, 7, 8), and feeds these synchronously in the direction of the workpiece (2) to be clamped or moves them away from the latter, a position-accurate, i.e. centered alignment for a large number of differently designed workpieces (2) can be achieved with a high repetition accuracy for subsequent clamping operations. This is achieved in that a rocker (11) is provided between the drive piston (9) and two adjacent clamping jaws (5, 7 or 6, 8), the rocker (11) has a center of symmetry (12) into which a bolt (13) which is pivotably mounted on the drive piston (9) and about which the rocker (11) can be pivoted as a function of the contact of the clamping jaws (5, 6 or 7, 8) on the workpiece (2) is inserted, and a corresponding transmission pin (14, 15) is provided laterally adjacent to the bolt (13) and coupled drivably to the rocker (11), the respective clamping jaw (5, 6, 7, 10 or 8) being mounted and supported at the end of the transmission pin opposite the rocker (11).

Dependencies are inferred from the claim text.