Punch Programmer With Magnetic Retract
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
An arrangement is described to improve the punch head design employed in the programmable punching scheme described in. The earlier punching system utilizes a punch head assembly design employing a pair of solenoid-type actuating devices, one for advancing the punch head and one for retracting the punch head. One of the difficulties encountered in the above double-solenoid-type punch head assembly resides in the fact that the solenoids do not operate reliably. The lack of reliability is caused, at least in part, by the fact that the arrangement exhibits weak starting forces resulting sometimes in failure to extend or retract on command. Moreover, utilization of two solenoids, one to hold the punch in the retracted position and the other to extend the punch, results in the generation of a substantial amount of heat.