Hydraulic let-off

Claim 1

IN A LET-OFF FOR A LOOM, A HOUSING, A DRIVING MEANS INCLUDING A FIRST ROTOR IN ONE PORTION OF SAID HOUSING, A CIRCUMFERENTIAL ENCLOSURE ENCOMPASSING SAID FIRST ROTOR AND IN SPACED RELATION THEREWITH TO DEFINE A CHAMBER BERTWEEN SAID ENCLOSURE AND SAID ROTOR, A PLURALITY OF VANES EXTENDING FROM SAID ROTOR, SPRING MEANS TO ENGAGE EACH OF SAID VANES WITH SAID ENCLOSURE, FLUID PASSAGES IN SAID ROTOR TO COACT WITH SAID SPRING TO URGE EACH OF SAID VANES INTO ENGAGEMENT WITH SAID ENCLOSURE, MEANS CONTROLLABLE FROM THE WARP TENSION OF THE LOOM FOR VARYING THE RELATIVE POSITIONS OF SAID ENCLOSURE AND SAID FIRST ROTOR, MEANS FOR EFFECTING CONTINUOUS ROTATION OF SAID FIRST ROTOR, A DRIVEN MEANS INCLUDING A SECOND ROTOR IN ANOTHER PORTION OF SAID HOUSING, SAID SECOND ROTOR BEING MOUNTED IN OPPOSED RELATION TO SAID FIRST ROTOR, A FURTHER CIRCUMFERENTIAL ENCLOSURE ENCOMPASSING SAID SECOND ROTOR AND IN SPACED RELATION THERETO TO DEFINE A FURTHER CHAMBER THEREBETWEEN, A PLURALITY OF VANES EXTENDING FROM SAID SECOND ROTOR, SPRING MEANS, AND FLUID PASSAGES IN SAID SECOND ROTOR, TO COACT WITH SAID SPRING MEANS TO ENGAGE SAID VANES WITH SAID FURTHER ENCLOSURE, MEANS INTERPOSING SAID FIRST AND SECOND ROTORS HAVING OPENINGS COMMUNICATING WITH SAID FLUID PASSAGES IN SAID FIRST AND SECOND ROTORS, AND MEANS CONNECTED TO SAID SECOND ROTOR AND ADAPTED TO LET OFF YARN FROM THE LOOM YARN BEAM.