Device for grinding tooth profiles of a rotating toothed workpiece

A device for grinding the tooth profiles of a workpiece with helical teeth comprising:

• means for mounting the workpiece such that it freely turns;
• at least two identically shaped globoidal tools each with toothlike protrusions for engaging the tooth gaps of the workpiece, the width of the protrusions being narrower than the desired width of the finished workpiece tooth gaps;
• the tool axes crossing each other and having equal distance from and forming the same angle with the workpiece axis;
• means for simultaneously rotating the at least two tools in the same direction;
• and
• means for imparting a torque to one of said tools relative to another of said tools to thereby shift the workpiece in a manner causing one of said tools to contact only the left side of the workpiece tooth profiles, while another of said tools contacts only the right side of the workpiece tooth profiles;
• said means for imparting a torque comprising control means for controlling the speed at which one of the tools is angularly displaced relative to the other and for controlling the position of one tool relative to the other by controlling the amount of angular displacement.