1. IN A MULTI-BOX LOOM HAVING A SHUTTLE, A VERTICALLY MOVABLE SHUTTLE BOX, A PICKER STICK AND A PICKER CARRIED BY THE PICKER STICK, A MECHANISM FOR FREEING THE PICKER STRICK FOR REARWARD MOVEMENT, SAID MECHANISM COMPRISING, IN COMBINATION, A DRIVER SHAFT, A CAM FIRMLY CONNECTED WITH SAID DRIVER SHAFT, A ROCKER LEVER, A PIVOT PIN SUPPORTING SAID ROCKER LEVER INTERMEDIATE ITS ENDS FOR OSCILLATORY MOVEMENT, A ROLLER CARRIED BY ONE END OF SAID ROCKER LEVER AND ENGAGING SAID CAM, A SPRING CONNECTED WITH SAID ROCKER LEVER AND PRESSING SAID ROLLER AGAINST SAID CAM, A ROD, MEANS PIVOTALLY CONNECTING THE OTHER END OF SAID ROCKER LEVER WITH ONE END OF SAID ROD, A SECOND ROCKER LEVER HAVING A CAM-SHAPED END, MEANS PIVOTALLY CONNECTING THE OTHER END OF THE SECOND-MENTIONED ROCKER LEVER WITH THE OTHER END OF SAID ROD, A SECOND PIVOT PIN SUPPORTING THE SECOND-MENTIONED ROCKER LEVER INTERMEDIATE ITS ENDS OF OSCIALLATORY MOVEMENT, SAID CAMSHAPED END HAVING A CYLINDRICAL SURFACE CONCENTRIC TO THE SECOND-MENTIONED PIVOT PIN, ANOTHER CYLINDRICAL SURFACE CONCENTRIC TO THE SECOND-MENTIONED PIVOT PIN AND OF SMALLER RADIUS THAN THAT OF THE FIRST-MENTIONED CYLINDRICAL SURFACE, AND A SLOPING SURFACE EXTENDING BETWEEN THE TWO CYLINDRICAL SURFACES, A MOBILE STOP ADAPTED TO ENGAGE SAID PICKER STICK, ANOTHER ROLLER CARRIED BY SAID MOBILE STOP AND ENGAGING SAID CAM-SHAPED END, AND A SPRING CONNECTED WITH SAID MOBILE STOP AND PRESSING THE SECONDMENTIONED ROLLER AGAINST SAID CAM-SHAPED END, SAID CAM AND SAID CAM-SHAPED END BEING SHAPED SO THAT A SMALL ANGULAR DISPLACEMENT OF SAID CAM GIVES RISE TO A LARGER ANGULAR DISPLACEMENT OF SAID CAM-SHAPED END.