Seam jumper control for cloth shears

Claim 1

IN A CLOTH SHEAR OF THE TYPE HAVING MEANS FOR PROPELLING AND GUIDING A SEAMED WEB OF CLOTH, SHEARING MEANS AT A SHEARING ZONE IN THE PATH OF TRAVEL OF THE CLOTH NORMALLY URGED TO A CLOTH SHEARING POSITION, AND SHEARINGSUSPENDING MEANS FOR POSITIONING THE SHEARING MEANS TO SUSPEND SHEARING ACTION UPON ACTIVATION THEREOF; MEANS FOR DETECTING THE APPROACH OF A SEAM TO THE SHEARING ZONE AND CONTROLLING SAID SHEARING-SUSPENDING MEANS IN TIMED RELATION THERETO COMPRISING A PLURALITY OF SEAM DETECTING ELEMENTS ALIGNED TRANSVERSELY OF THE CLOTH WEB AT LATERALLY SPACED LOCATIONS IN THE PATCH OF TRAVEL AT A SENSING ZONE SPACED FROM THE SHEARING ZONE TO BE MOMENTARILY ACTUATED RESPONSIVE TO PASSAGE OF A SEAM, A PLURALITY OF DETECTOR RELAYS EACH CONNECTED TO ONE OF THE SEAM DETECTING ELEMENTS TO BE ENERGIZED UPON ACTUATION OF THEIR ASSOCIATED SEAM DETECTING ELEMENTS, A BISTABLE MULTIVIBRATOR CIRCUIT HAVING FIRST AND SECOND STABLE STATES, MEANS RESPONSIVE TO SAID FIRST STABLE STATE FOR ACTIVATING SAID SHEARING-SUSPENDING MEANS TO SUSPEND SHEARING DURING THE PERIOD OF SAID FIRST STABLE STATE, FIRST AND SECOND TIME DELAY STAGES EACH INCLUDING A ONE-SHOT MULTIVIBRATOR RESPONSIVE TO TRIGGERING SIGNALS TO ASSUME AN UNSTABLE STATE AND OPERATIVE TO AUTOMATICALLY SWITCH TO A STABLE STATE A TIME DELAY INTERVAL FOLLOWIGN SUCH TRIGGERING SIGNALS, MEANS RESPONNSIVE TO ENERGIZATION OF ANY ONE OF SAID DETECTOR RELAYS FOR TRIGGERING THE FIRST TIME DELAY MULTIVIBRATOR TO SAID UNSTABLE STATE, MEANS FOR SHIFTING SAID BISTABLE MULTIVIBRATOR TO SAID FIRST STABLE STATE TO ACTIVATE SAID SHEARING-SUSPENDING MEANS RESPONSIVE TO SWITCHING OF SAID FIRST TIME DELAY MULTIVIBRATOR TO ITS STABLE STATE, MEANS RESPONSIVE TO ENERGIZATION OF ALL SAID DETECTOR RELAYS AND RETURN OF SAID SEAM DETECTING ELEMENTS TO NON-ACTUATED CONDITION FOR TRIGGERING SAID SECOND TIME DELAY MULTIVIBRATOR TO ITS UNSTABLE STATE, MEANS FOR SHIFTING SAID BISTABLE MULTIVIBRATOR TO SAID SECOND STABLE STATE RESPONSIVE TO SWITCHING OF SAID SECOND TIME DELAY MULTIVIBRATOR TO ITS STABLE STATE, AND ADJUSTABLE RESISTANCE MEANS FOR EACH OF SAID TIME DELAY MULTIVIBRATORS FOR REGULATING THE TIME INTERVAL BETWEEN TRIGGERING THEREOF THEIR UNSTABLE STATES AND SWITCHING TO THEIR STABLE STATES.