1. IN AN AUTOMATIC REPLENISHING LOOM HAVING A BOX SIDE WITH A FILLING DETECTOR, A REPLENISHING SIDE HAVING A FILLING CHANGE MECHANISM INCLUDING A PIVOTAL HAMMER FOR INSERTING A FULL BOBBIN IN A SHUTTLE AND STRIPPING A SPENT BOBBIN THEREFROM, A RECIPROCATING LAY, THE IMPROVEMENT IN MEANS FOR CONTROLLING THE FILLING CHANGE MECHANISM WHEN THE FILLING DETECTOR INDICATES A SPENT BOBBIN COMPRISING: AN ELECTRICAL CIRCUIT HAVING A RELAY THEREIN; A NORMALLY OPEN SWITCH IN SAID CIRCUIT AND OPERATIVELY CONNECTED TO THE FILLING DETECTOR AND CLOSED BY THE SAME WHEN A SPENT BOBBIN IS DETECTED AT THE BOX SIDE OF THE LOOM, SAID RELAY BEING ENERGIZED WHEN SAID SWITCH IS CLOSED; A NORMALLY OPEN HOLDING CIRCUIT FOR SAID RELAY, SAID HOLDING CIRCUIT BEING CLOSED WHEN SAID RELAY IS INITIALLY ENERGIZED BY CLOSING OF SAID DETECTOR SWITCH; A NORMALLY OPEN SWITCH MOUNTED IN PARALLEL WITH RESPECT TO SAID RELAY, SAID NORMALLY OPEN SWITCH BEING ACTUATED TO CLOSED POSITION BY MOVEMENT OF SAID HAMMER WHEREBY SAID HOLDING CIRCUIT IS SHORT CIRCUITED SO THAT SAID RELAY IS DEENERGIZED THUS CAUSING SAID SOLENOID TO RETURN SAID LINKAGE TO ITS INACTIVE POSITION; A SECOND NORMALLY OPEN CIRCUIT HAVING A SOLENOID THEREIN AND ADAPTED TO BE CLOSED UPON ENERGIZING OF SAID RELAY; LINKAGE MEANS OPERATIVELY CONNECTED TO THE HAMMER AND TO THE SOLENOID, SAID LINKAGE MEANS BEING ACTUATED UPON ENERGIZING OF SAID SOLENOID FROM AN INACTIVE POSITION TO A SECOND POSITION FOR INITIATING ACTUATION OF THE HAMMER; MEANS MOVABLE BY THE LAY AND OPERATIVELY ENGAGING SAID LINKAGE MEANS WHEN SAID LINKAGE MEANS IS IN SAID SECOND POSITION TO THEREBY MOVE SAID LINKAGE MEANS ON THE NEXT PICK AFTER DETECTION BY SAID FILLING DETECTOR SO AS TO CAUSE THE HAMMER TO INSERT THE FULL BOBBIN IN THE SHUTTLE WHILE STRIPPING THE SPENT BOBBIN THEREFROM.