Yarn spinning machine

Claim 1

A SPINNING MACHINE FOR PREPARING SPUN YARN FROM STAPLE LENGTH FIBER COMPRISING IN COMBINATION, A CYLINDRICAL ROTATABLY MOUNTED SPINNING SPINDLE HAVING A HOLLOW INTERIOR, MEANS FOR SUPPORTING SAID SPINNING SPINDLE AND MEANS FOR ROTATING SAID SPINNING SPINDLE ABOUT ITS CENTER AXIS, MEANS FOR MAINTAINING REDUCED AIR PRESSURE WITHIN THE HOLLOW INTERIOR OF SAID SPINNING SPINDLE, MEANS FOR ADVANCING UNSPUN FIBER AND MEANS FOR WITHDRAWING SPUN FIBER YARN FROM AN AREA ON THE OUTER CURVED SURFACE OF SAID SPINNING SPINDLE DEFINED AS THE FIBER SPINNING ZONE; SAID SPINNING SPINDLE COMPRISING A HOLLOW CYLINDRICAL ROTOR CAPPED AT ONE END AND HAVING THE OTHER END OPEN, THE OPEN END COMMUNICATING WITH SAID MEANS FOR MAINTAINING REDUCED AIR PRESSURE THROUGH AN ESSENTIALLY AIR-TIGHT SEAL WITH ROTATIONAL CLEARANCE RELATIVE TO THE OUTER SURFACE OF THE ROTOR ADJACENT THE SEAL; COMMUNICATION BETWEEN THE HOLLOW INTERIOR OF THE ROTOR OPERATING UNDER REDUCED AIR PRESSURE AND THE FIBER SPINNING ZONE OF THE OUTER ROTOR SURFACE OPERATING AT NORMAL AIR PRESSURE PROVIDED BY A SCREEN-COVERED CIRCUMFERENTIAL SLIT, SAID SLIT OCCUPYING AN ARCUATE PORTION OF AT LEAST ABOUT 45* ON THE ROTOR SURFACE WITHIN THE SPINNING AREA, SAID ROTOR PROVIDED WITH A CYLINDRICAL YARN PASSAGEWAY WITHIN THE CAPPED END OF THE ROTOR, SAID YARN PASSAGEWAY ORIGINATING AS A SUBSTANTIALLY CIRCULAR OPENING ON THE OUTER SURFACE OF THE ROTOR ADJACENT TO AND ON THE SAME CYLINDER CIRCUMFERENCE AS THE SCREENED SLIT BUT NOT COMMUNICATING THEREWITH, THE ORIGIN OF THE YARN PASSAGEWAY BEING SPACED FROM THE SCREENED SLIT BY NOT MORE THAN 180* OF ARC MEASURED ON THE ROTOR SURFACE FROM THE ROTATIONAL LEADING EDGE OF THE SCREENED SLIT, SAID YARN PASSAGEWAY EXTENDING IN A SMOOTH DIRECT PATH FROM ITS ORIGIN ON THE ROTOR SURFACE DOWN THROUGH THE CAPPED PORTION OF THE ROTOR AND TERMINATING AS A CIRCULAR OPENING AT THE CENTER OF ROTATION OF THE CAPPED END OF THE ROTOR.