Grinding wheel dresser

Claim 1

Machine tool comprising in combination: a. a workpiece holder adapted to support a generally cylindrical workpiece for rotation about its axis; b. a carriage support; c. means for effecting linear movement of the workpiece holder relatively to the carriage support in a longitudinal direction parallel to the axis of rotation of the workpiece; d. a tool-support carriage mounted on the carriage support for movement relative thereto in a transverse direction perpendicular to said longitudinal direction; e. spring means biasing the carriage relative to the support away from the path of relative movement of the workpiece holder; f. eccentric cam means mounted for rocking movement in the support about a longitudinally extending axis and effective to displace the tool-supporting carriage controllably relative to the support against the action of said spring means; g. a linear cam which is movable with the workpiece holder and inclined to the said longitudinal direction; h. a roller adapted to roll on said linear cam; i. lever means supporting the roller and operatively connected to the eccentric cam to effect controlled rocking movement of the latter in dependence on the relative linear movement of the workpiece holder and the carriage support, thereby to effect controlled reciprocation of the carriage relative to the carriage support in said transverse direction, the linear cam comprising a cradle support, a sector-shaped member mounted in the cradle support for rocking movement about a transverse axis, means effective to adjust the angular position of the sector-shaped member in the cradle support to adjust the angle of inclination of the linear cam and hence the extent of reciprocation of the tool-supporting carriage, and locking means effective to lock the said member in its adjusted position relative to the cradle support.