Abstract: An automatic copying belt grinding machine comprising a vertically moving Z-axis slide, a horizontally moving X-axis slide, a horizontally moving X-axis slide slidably mounted on said Z-axis slide, a duplex electronic copying sensor and a grinding head swivelling device mounted together on said X-axis slide, and a pair of synchronously rotating fixture tables for respectively vertically mounting a copying model to be brought into interaction with said duplex electronic copying sensor and a workpiece to be brought into interaction with said grinding head swivelling device, whereby all these components are made to perform a copy grind machining operation jointly under the control of a simultaneous control unit.

Abstract: A model and a workpiece are rotated synchronously, and a stylus is disposed for relative movement toward or away from the model in a direction perpendicular to the axis of rotation thereof for contact therewith. The amount of displacement of the stylus from its neutral point which occurs while it contacts the model is detected by a tracer head and is divided into a pair of components lying in a plane perpendicular to the axis of rotation of the model which are along the direction of said relative movement and along a direction orthogonal thereto.

Abstract: A machine for preworking overlapping abrasive coated joint comprising original roll unit, cutting and working unit, and slit unit sections. The cutting and working unit section has a horizontal table 9 having a knife blade 21 attached to its forward end. First and second flaps are swivellably mounted on said cutting and working section by means of a shaft in such a way that their end portions are brought to the position flush with said knife edge and in contact therewith. A belt material hold down roller is disposed on the top surface of said second flap. In the cutting and working unit section, an upper working unit and a lower working unit are disposed above and below said horizontal table. The upper working unit having a circular cutter for cutting the grinding belt material, a grinding wheel for skiving, and a shaving grinding belt for pointing the upper end surface of the grinding belt material.