Machine control device

A machine control system for controlling the movement of a machine tool along a path comprising:

• a movable support rod;
• a sensor coupled to said movable support rod;
• mounting means coupled to slidably retain said support rod for movement along an axis;
• a limit switch coupled to said mounting means to be closed upon movement of said sensor to a preselected position;
• means coupled to said support rod for closing said limit switch during movement of the rod along said axis;
• means extending from said support rod;
• a movable arm having one end positioned in contact with and beneath said extending means so that said extending means rests thereon;
• means coupled to said mounting means and to said arm for moving said arm to allow said rod and sensor to move along said axis;
• actuator switch means electrically coupled to said moving means for selectively providing power to said moving means as an incident of actuation of said actuator switch means;
• relay means responsive to said actuator switch means and to closure of said limit switch for providing power to cause movement of a machine tool;
• and
• a disconnect switch means coupled to said relay means and responsive to the end of a machine stroke for terminating said power causing machine tool movement, said relay means including a first relay having associated normally open contacts and normally closed contacts, said first relay being responsive to said actuator switch means to close said normally open contacts and open said normally closed contacts upon closure of said limit switch, and a second relay having associated normally open contacts, said second relay being coupled to said disconnect switch means and responsive to power received from said actuator switch means for closing said normally open contacts of said second relay.