APPARATUS FOR PUNCHING STEEL STUDS AND CONTROL CIRCUIT

摘要

A portable hand-held apparatus (10) for punching light gauge steel framing studs used in building construction to form holes of sufficient size to allow building wiring and piping to extend therethrough includes a control circuit (170) connected to a limit switch (76) and a main switch (72), and an output (38) connected to a driving mechanism (40). The control circuit (170) is configured to selectively operate the driving mechanism (40) in response to assertion of the main switch (72) by the user to drive the punch and die assembly (24) from the deactuated position, over the working cycle, through the actuated position to form the punched hole, and continue to drive the punch and die assembly (24) to the deactuated position to complete the cycle and assert the limit switch (76). The control circuit (170) halts operation of the driving mechanism (40) in response to assertion of the limit switch (76).