Air actuated switch for intermittent sheet control

Claim 1

AN AIR PRESSURE OPERATED SWITCH FOR CONTROLLING A SOURCE OF ENERGY, SAID SWITCH COMPRISING: A FIXED CONTACT, A MOVABLE CONTACT NORMALLY OUT OF ENGAGEMENT WITH SAID FIXED CONTACT, AN ELECTRIC CIRCUIT INCLUDING SAID CONTACTS, A CHAMBER, MEANS FOR DELIVERING AIR UNDER PRESSURE INTO SAID CHAMBER, AN OPENING LEADING FROM SAID CHAMBER TO THE ATMOSPHERE, A DOOR FOR SAID OPENING, AND A SWITCH ARM SECURED AT ONE END THEREOF TO SAID DOOR AND SECURED AT THE OTHER END THEREOF TO SAID MOVABLE CONTACT, SAID DOOR BEING SO CONSTRUCTED AND ARRANGED THAT, IN THE ABSENCE OF PRESSURE IN SAID CHAMBER OF A PERDETERMINED VALUE, SAID DOOR OBSTRUCTS SAID OPENING AND MOVES SAID ARM TO SWITCH CLOSING POSITION AND SO THAT, WHEN THE PRESSURE IN SAID CHAMBER REACHES SAID PREDETERMINED VALUE, SAID DOOR MOVES TO AN UNOBSTRUCTING POSITION AND MOVES SAID ARM TO SWITCH OPENING POSITION, SAID CHAMBER HAVING A SECOND NORMALLY UNOBSTRUCTED OPENING LEADING TO THE ATMOSPHERE, SAID SECOND OPENING BEING ADAPTED TO BE OBSTRUCTED BY A WORKPIECE PASSING THEREOVER TO RAISE THE PRESSURE WITHIN SAID CHAMBER TO SAID PREDETERMINED VALUE.