Slub catchers for yarn spinning, doubling and similar machines

Claim 1

A SLUB DETECTOR UNIT FOR YARN SPINNING, DOUBLING AND SIMILAR MACHINES COMPRISING A CASING FOR THE UNIT, A PAIR OF CYLINDERS SPACED APART AND ROTATABLY MOUNTED IN THE CASING AND EACH HAVING A RADIALLY OUTWARDLY OPENING V SHAPED PERIPHERAL GROOVE THEREIN THROUGH WHICH THE YARN PASSES, SAID GROOVE HAVING A PROGRESSIVELY INCREASING DEPTH THROUGHOUT ITS LENGTH, MEANS FOR LOCKING EACH CYLINDER IN THE DESIRED POSITION, A FEELER ENGAGING SAID GROOVE IN EACH CYLINDER, AN ELECTRIC CIRCUIT HAVING PARALLEL SWITCHES ARRANGED IN PARALLEL CIRCUIT RELATIONSHIP AND BEING ASSOCIATED ONE WITH EACH OF SAID FEELERS TO BE RESPECTIVELY ACTUATED THEREBY, A KNIFE AND ANVIL MOUNTED IN THE UNIT CASING WITH THE KNIFE ASSOCIATED ELECTICALLY IN PARALLEL WITH BOTH SWITCHES WHEREBY THE ELECTRIC CIRCUIT IS ONLY OPEN TO CUT THE YARN AND STOP THE MACHINE WHEN BOTH SWITCHES ARE OPEN TOGETHER AND A TIMING DEVICE TO DELAY THE OPERATION OF THE KNIFE TO DETECT DOUBLE YARN.