PROCEDIMENTO E DISPOSITIVO PER COMANDARE UN DISPOSITIVO D'AVANZAMENTO SU UNA MACCHINA PER FASI DI LAVORO RIPETENTESI

An arrangement for controlling the advancing device of a machine for repetitive operations, especially for controlling the advancing speed of a slide carrying a cutting device of a cutting machine for cutting an elongated workpiece, such as a profile emanating at a predetermined speed from an extrusion press, a straightening machine or the like, into sections of uniform length. The arrangement performs the steps of preaccelerating the slide before a front end of the workpiece hits an abutment located on the slide in the path of the front end of the workpiece to a speed smaller than the speed at which the workpiece advances, and accelerating the speed of the slide to the speed of the workpiece upon engagement of the front end of the workpiece with the abutment, and subsequently thereto actuating the cutting device, whereby the impact force of the workpiece on the abutment is reduced, so that buckling of the workpiece upon impact on the abutment is prevented and the accuracy of the cutting operation is increased.