Pneumatic cleaning system for ring spinning frames

Claim 1

A PNEUMATIC CLEANING SYSTEM FOR RING SPINNING MACHINES HAVING TWO PARALLEL SPINDLE RAILS INDIVIDUALLY SUPPORTING A ROW OF SPINDLES AND A PLURALITY OF DRAFTING ARRANGEMENTS PLACED ABOVE SAID SPINDLE RAILS, SAID SYSTEM COMPRISING AN AIR DUCT ADJACENT TO AND EXTENDING LONGITUDINALLY OF SAID SPINDLE RAILS, SAID DUCT BEING PLACED BETWEEN SAID SPINDLES AND HAVING LATERAL WALLS ADJACENT TO THE SPINDLES AND HAVING A TOP WALL PLACED BENEATH AND ADJOINING SAID DRAFTING ARRANGEMENTS, SAID LATERAL WALLS AND SAID TOP WALL OF SAID DUCT HAVING AIR INLET OPENINGS FOR DIRECTLY RECEIVING AIR FROM THE OUTSIDE, SAID DUCT HAVING A BOTTOM WALL HAVING A ROW OF SPACED AIR OUTLETS PLACED LONGITUDINALLY OF THE MACHINE AND BETWEEN THE SPINDLE RAILS, AND A ROTARY FAN LOCATED IN EACH OF SAID AIR OUTLETS FOR DRAWING AIR THROUGH SAID OPENINGS INTO SAID DUCT.