Control system with adjustable selector switch means for web severing machine

Claim 1

APPARATUS FOR SUCCESSIVELY SEVERING SHEETS OF PREDETERMINED LENGTH FROM A CONTINOUSLY MOVING WEB OF SHEET STOCK, SAID APPARATUS COMPRISING MEANS ESTABLISHING A LINEAR PATH OF TRAVEL FOR FORWARD MOVEMENT OF THE WEB AND THE SEVERED SHEETS THROUGH THE APPARATUS, MEANS ESTABLISHING A WEB FEEDING STATION, A WEB SEVERING STATION AND A WEB SENSING STATION AT SPACED REGIONS ALONG SAID PATH CONSECUTIVELY FORWARDLY OF THE PATH AND IN THE ORDER NAMED, A PAIR OF FEED ROLLS AT THE FEEDING STATION FOR FEEDING THE WEB FORWARDLY THROUGH THE SEVERING STATION TO THE SENSING STATION, A ROTARY CUTTER AT THE SEVERING STATION FOR SUCCESSIVELY SEVERING SHEETS FROM THE WEB PASSING THROUGH THE SEVERING STATION AT A FIXED CUT-OFF POINT AND IN A PREDETERMINED ANGULAR CUTTING POSITION, A SCANNING DEVICE AT THE SENSING STATION POSITIONED FOR OPERATIVE REGISTER AT A FIXED SENSING POINT WITH THE LEADING EDGE OF THE UNSEVERED WEB EMANATING FROM SAID SEVERING STATION AND OPERABLE IN RESPONSE TO SUCH REGISTER TO EMIT AN ELECTRICAL IMPULSE, AN ELECTRIC MOTOR FOR DRIVING SAID CUTTER AND FEED ROLLS, A FIXEDLY SETTABLE VARIABLE SPEED TRANSMISSION INTERPOSED BETWEEN THE CUTTER AND FEED ROLLS WHEREBY THE RELATIVE SPEED AT WHICH THE CUTTER AND FEED ROLLS ARE DRIVEN MAY BE VARIED ACCORDING TO THE SETTING OF THE VARIABLE SPEED TRANSMISSION, MEANS OPERATIVELY CONNECTING SAID VARIABLE SPEED DEVICE AND MOTOR IN DRIVING RELATIONSHIP, A PAIR OF NORMALLY DEENERGIZED WORK CIRCUITS ADAPTED TO BECOME ENERGIZED UNDER THE INFLUENCE OF IMPULSES RECEIVED FROM SAID SCANNING DEVICE, A ROTARY SELECTOR SWITCH INCLUDING A PAIR OF CIRCUMFERENTIALLY SPACED BRUSHES, ONE FOR EACH WORK CIRCUIT, AND A ROTARY BRIDGING CONTACT OPERATIVELY CONNECTED TO THE CUTTER IN DRIVING RELATIONSHIP, SAID BRIDGING CONTACT BEING OPERABLE WHEN IN ENGAGEMENT WITH ONE OF SAID BRUSHES TO DISABLE ONE OF THE WORK CIRCUITS AND WHEN IN ENGAGEMENT WITH THE OTHER OF SAID BRUSHES TO DISABLE THE OTHER WORK CIRCUIT, MEANS ALLOWING FOR CIRCUMFERENTIAL ADJUSTMENT OF SAID BRUSHES IN UNISON, SAID MEANS INCLUDING AN ANGULARLY ADJUSTABLE BRUSH HOLDER CONSTRAINING SAID BRUSHES TO MOVE IN UNISON, SAID BRIDGING CONTACT BEING ENGAGEABLE WITH BOTH OF SAID BRUSHES WHEN THE LEADING EDGE OF THE UNSEVERED WEB IS IN REGISTER WITH THE SCANNING DEVICE AND THE CUTTER IS IN ADVANCE OF ITS ANGULAR CUTTING POSITION BY A PREDETERMINED AMOUNT, SAID BRIDGING CONTACT BEING ENGAGEABLE WITH ONE OF SAID BRUSHES TO THE EXCLUSION OF THE OTHER WHEN THE LEADING EDGE OF THE UNSEVERED WEB IS IN REGISTER WITH THE SCANNING DEVICE AND THE CUTTER IS IN ADVANCE OF ITS ANGULAR CUTTING POSITION BY AN AMOUNT LESS THAN SAID PREDETERMINED AMOUNT, SAID BRIDGING CONTACT BEING ENGAGEABLE WITH THE OTHER OF SAID BRUSHES TO THE EXCLUSION OF THE ONE WHEN THE LEADING EDGE OF THE UNSEVERED WEB IS IN REGISTER WITH THE SCANNING DEVICE AND THE CUTTER IS IN ADVANCE OF ITS ANGULAR CUTTING POSITION BY AN AMOUNT GREATER THAN SAID PREDETERMINED AMOUNT, A REVERSIBLE ELECTRIC MOTOR FOR CONTROLLING THE SPEED RATIO OF SAID VARIABLE SPEED TRANSMISSION AND OPERATIVELY CONNECTED TO SAID WORK CIRCUITS AND TO SAID VARIABLE SPEED TRANSMISSION, SAID REVERSIBLE MOTOR BEING OPERABLE UPON ENERGIZATION OF ONE OF SAID WORK CIRCUITS TO CHANGE THE SETTING OF SAID VARIABLE SPEED TRANSMISSION AND INCREASE THE SPEED RATIO BETWEEN THE CUTTER AND FEED ROLLS AND OPERABLE UPON ENERGIZATION OF THE OTHER WORK CIRCUIT TO CHANGE THE SETTING OF THE VARIABLE SPEED TRANSMISSION AND DECREASE THE SPEED RATIO BETWEEN THE CUTTER AND THE FEED ROLLS, AND MANUALLY OPERABLE MEANS FOR SHIFTING THE ANGULAR POSITION OF SAID BRUSH HOLDER TO ADVANCE OR RETARD THE ENGAGEMENT OF SAID BRUSHES WITH SAID BRIDGING CONTACT.