Patent ID: 6428070
Filing Date: 2002-08-06
Classification: B25B,B25J,Y10S

Abstract:
A chuck with a position detecting function, comprising:a plurality of jaw members for gripping a work piece, the plurality of jaw members provided on an axial end part of a casing and configured to open and close orthogonally to the axis of the casing; a driving part having a driving rod linearly and reciprocally movable in parallel to the axis of the casing, the driving part provided on a base end part of the casing on one of right and left sides of the casing; a position detecting part configured to detect operating positions of the jaw members, the position detecting part having a scale and a reader, the scale configured to move linearly and reciprocally in parallel to and synchronous with the driving rod and provided adjacent to the driving part on the base end part of the casing, the reader being fixed on a certain position of the casing for reading calibration on the scale; a linear guide mechanism provided between the driving part and the position detecting part and configured to guide linear reciprocal movement of the scale; and a converting mechanism provided between the jaw members and the driving part and configured to convert linear reciprocal motion of the driving rod into opening and closing operations of the jaw members; wherein: the converting mechanism comprises two levers for opening and closing the jaw members by swaying, and a relay plate for interlocking the levers with the driving rod; and the relay plate is provided with a relay shaft positioned on a center portion of the chuck and having a common shaft positioned to pivot the levers, the relay plate is interlocked with the driving rod and a scale supporting member supporting the scale so as to be capable of being displaced together with the relay shaft.