Manual and automatic device for the displacement of the drive belts, more particularly for hosiery or similar machines

Claim 1

A MANUAL DEVICE FOR DISPLACING A DRIVE BELT, MORE PARTICULARLY FOR HOSIERY MACHINES, FROM AN IDLER PULLEY TO A DRIVEN PULLEY AND VICE VERSA, COMPRISING AT LEAST ONE SLIDER HAVING A YOKE WHICH TRANSFERS THE BELT FROM ONE PULLEY TO THE OTHER; A RETURN DEVICE PERMANENTLY URGING SAID SLIDER TO RETURN TO ITS INITIAL POSITION IN WHICH THE BELT IS LOCATED ON THE IDLER PULLEY; A BLOCKING DEVICE FOR SAID SLIDER TO MAINTAIN THE LATTER IN THE POSITION CORRESPONDING TO THE BELT BEING ON THE DRIVEN PULLEY; A CAM FOR THE SLIDER; A MANUALLY OPERATED CONTROL LEVER FIXED TO THE CAM CAPABLE OF DISPLACING SAID SLIDER AS WELL AS SAID BLOCKING DEVICE, THERE BEING ONLY THE LEVER IN COMBINATION WITH THE CAM MECHANISM AND THE PIVOTALLY MOUNTED BAR TO CAUSE MOVEMENT AND LOCKING OF THE SAID SLIDER; AND AN ELECTRO-MAGNETIC CONTROL MECHANISM TO DISENGAGE THE SAID BLOCKING DEVICE, THE SAID ELECRO-MAGNETIC CONTROL MECHANISM BEING OPERATED BY MEANS ON THE MACHINE TO OPERATE THE CONTROL MECHANISM IN RESPONSE TO ACCIDENTAL CAUSES.