Abstract: Safe operation of a transfer device on a press is provided by the present invention. In the transfer device in which the drive of servo motors in the drive units 1, is caused to be synchronized with the operation of the transfer press itself by positionally controlling motions of beams through servo controllers a torque value of a specific transfer pattern actually measured under normal operation is established to be a reference torque value of the transfer pattern; a torque allowance is calculated by defining the upper and lower limit torque values by adding or subtracting a preliminarily set deviation value to or from the reference torque value in a CPU of a control unit, and the torque allowance is stored in the control unit. The actual torque value is compared with the torque allowance to acknowledge whether or not the actual torque value is within the stored torque allowance in later forming operation using the same transfer pattern.

Abstract: To apply exactly a variety of operating patterns to an automatic transfer apparatus for use in a forging press, an arrangement is proposed comprising: intermediate frames each mounted on an external frame so as to move freely up and down; a clamp frame mounted on the intermediate frame so as to move freely in a lateral direction; a pair of beams mounted on the clamp frame so as to open and close freely; servo motors for performing upward and downward motion, lateral motion and opening-and-closing motion; and drive control equipment. The operation patters are inputted to a microcomputer for picture processing and displayed. Accordingly, the driving operations are exactly controlled by pulse signals and feedback pulses of the servo motors. The arrangement is applicable to various types of motions. Feed motion being of the longest stroke is linear and therefore positioning becomes accurate. The construction is advantageous in accomplishing a small-sized and light-weight automatic transfer apparatus.