Multiple sheet detector

Claim 2

IN A SHEET-HANDLING APPARATUS WHEREIN SHEETS ARE SUCCESSIVELY MOVED ALONG A SHEET PATH PAST A SENSING STATION DISPOSED ALONG SAID PATH, MEANS AT SAID SENSING STATION FOR SENSING A SHEET AS IT PASSES THE STATION AND PROVIDING AN ELECTRICAL PULSE IN RESPONSE TO THE PASSAGE OF AN EDGE OF THE SHEET AND HAVING A MAGNITUDE WHICH IS THE FUNCTION OF THE RATE OF CHANGE OF THICKNESS OF SAID EDGE AS IT PASSES THE SENSING STATION, AND FUTHER MEANS CONNECTED TO THE FIRST-MENTIONED MEANS FOR ANALYZING THE MAGNITUDE OF SAID PLUSE AND FOR PERFORMING A CONTROL OPERATION EFFECTING THE MOVEMENT OF SAID SHEETS WHEN SAID PULSE IS GREATER THAN A PREDETERMINED MAGNITUDE.

Claim 3

IN A SHEET-HANDLING APPARATUS WHEREIN A PLURALITY OF SHEETS ARE MOVED IN SUCCESSION PAST A SENSING STATION, SENSING MEANS AT SAID STATION INCLUDING A SENSING ELEMENT DEFLECTED IN A FIRST DIRECTION BY THE ARRIVAL OF A PARTICULAR EDGE OF THE SHEET AT SAID STATION, FIRST CIRCUIT MEANS RESPONSIVE TO THE DEFLECTION OF SAID ELEMENT IN SAID FIRST DIRECTION FOR PROVIDING A PULSE, PULSE-GENERATING MEANS OPERATED IN SYNCHRONISM WITH SAID SHEET-HANDLING APPARATUS AND PROVIDING A CLOCK PULSE AT THE TIME SAID EDGE IS TO ARRIVE AT SAID SENSING STATION, MEANS FOR COMPARING THE TIME OF OCCURRENCE OF SAID PULSES AND FOR EFFECTING A CONTROL OPERATION IN RESPONSE TO THE OCCURRENCE OF SAID OUTPUT PULSE OUT OF TIME WITH RESPECT TO SAID CLOCK PULSE.

Claim 4

IN A SHEET-HANDLING APPARATUS WHEREIN A PLURALITY OF SHEETS ARE MOVED IN SUCCESSION PAST A SENSING STATION, SENSING MEANS AT SAID STATION INCLUDING A SENSING ELEMENT DEFLECTED IN A FIRST DIRECTION BY THE ARRIVAL OF A PARTICULAR EDGE OF THE SHEET AT SAID STATION, FIRST CIRCUIT MEANS RESPONSIVE TO THE DEFLECTION OF SAID ELEMENT IN SAID FIRST DIRECTION FOR PROVIDING A PULSE, PULSE-GENERATING MEANS OPERATED IN SYNCHRONISM WITH SAID SHEET-HANDLING APPARATUS AND PROVIDING A CLOCK PULSE AT THE TIME SAID EDGE IS TO ARRIVE AT SAID SENSING STATION, MEANS FOR COMPARING THE TIME OF OCCURRENCE OF SAID PULSES AND FOR EFFECTING A CONTROL OPERATION IN RESPONSE TO THE OCCURRENCE OF SAID OUTPUT PULSE OUT OF TIME WITH RESPECT TO SAID CLOCK PULSE.

Claim 5

IN A SHEET-HANDLING MACHINE, A TRANSDUCER FOR SENSING THE MOVEMENT OF SHEETS TO A PREDETERMINED POSITION ON A TABLE, A BALL OF MAGNETIC MATERIAL ADAPTED TO RIDE ON THE SHEET MATERIAL AT SAID STATION AND FREE TO MOVE TOWARD AND FROM SAID TABLE, A MAGNETIC CORE DISPOSED BELOW THE UPPER SURFACE OF THE TABLE AND HAVING AN AIR GAP OPPOSITE TO SAID BALL, MEANS CONSTRAINING SAID BALL AGAINST LATERAL MOVEMENT, AND AN INDUCTANCE COIL ON SAID CORE, SAID CORE AND BALL BEING RELATIVELY POSITIONED SO THAT THE INDUCTANCE OF SAID COIL VARIES AS A PREDETERMINED FUNCTION OF THE POSITION OF SAID BALL.

Claim 6

IN A SHEET-HANDLING MACHINE, A TRANSDUCER FOR SENSING THE MOVEMENT OF SHEETS TO A PREDETERMINED POSITION ON A TABLE, A BALL OF MAGNETIC MATERIAL ADAPTED TO RIDE ON THE SHEET MATERIAL AT SAID STATION AND FREE TO MOVE TOWARD AND FROM SAID TABLE, A MAGNETIC CORE DISPOSED BELOW THE UPPER SURFACE OF THE TABLE AND HAVING AN AIR GAP OPPOSITE TO SAID BALL, MEANS CONSTRAINING SAID BALL AGAINST LATERAL MOVEMENT, AND AN INDUCTANCE COIL ON SAID CORE, SAID CORE AND BALL BEING RELATIVELY POSITIONED SO THAT THE INDUCTANCE OF SAID COIL VARIES AS A PREDETERMINED FUNCTION OF THE POSITION OF SAID BALL.