a method of feeding a work station , which utilizes a robot to grasp workpieces one after the other at a charging station to which the workpieces are successively conducted to feed them to the work station and to transfer the workpiece worked upon to a discharging station . the robot grasps every workpiece arriving at the charging station by a workpiece holder that grasps the workpieces at a predetermined place thereon and holds them during all the time of transfer thereof and working thereon and releases the workpieces only when they arrive at the discharging station . at the work station , the workpiece holder is held in a very precise position by a gripping block rigidly fixed to a member in the work station . an apparatus for practicing this method comprises a workpiece holder adapted to the geometry of the workpieces to be processed , and a gripping block mounted on a member in the work station and arranged to receive the workpiece holder and to securely hold the same in a precise position at the work station . this application is a continuation of application ser . no . 07 / 018 , 849 , filed 02 / 24 / 87 , now abandoned , which is a continuation of application ser . no . 06 / 810 , 722 , filed 12 / 19 / 85 , now abandoned .