Pneumatically operated yarn threading mechanisms for textile yarn processing machine

In a textile yarn processing machine, such as a two-for-one twister or the like, having a plurality of spindle assemblies each including a driven rotor mechanism defining therewithin an elongate yarn passageway and a stationary carrier mechanism for carrying a hollow supply package of yarn and defining therewithin an elongate yarn passageway joining with said rotor mechanism yarn passageway;

• the combination therewith of pneumatically operated threading mechanisms for automatically threading yarn withdrawn from the supply package through said passageways during threading-up of said spindle assembly and being characterized by a construction which eliminates the necessity of predetermined positioning of said rotor mechanism for the threading operation and provides for the supplying of air under pressure thereto only through stationary spindle assembly components, said pneumatically operated threading mechanisms comprising:
• selectively operated, air injector nozzle means positioned at the juncture of said yarn passageways for creating an air suction through said carrier mechanism passageway and a jet of positive airflow through said rotor mechanism passageway for pneumatically threading of yarn through said passageways, said injector nozzle means comprising an open cavity formed in said carrier mechanism around said yarn passageway therethrough for receiving air under pressure, tube means forming a part of and an extension of said carrier mechanism passageway and extending through said cavity and into said rotor mechanism passageway in partial telescoping relationship, and said tube means being of smaller cross-sectional dimension than said rotor mechanism passageway for defining an annular gap between the telescoping portions thereof which communicates with said cavity for receiving air under pressure from said cavity around said tube means and into said rotor mechanism passageway to produce the air injector effect;
• and
• means for selectively supplying air under pressure to said injector nozzle means regardless of the position of said rotor mechanism and comprising air duct means leading from the outer periphery of said stationary carrier mechanism, through said carrier mechanism and to said cavity forming a part of said injector nozzle means, and a source of air under pressure including connector means mounted for selective movement into and out of air supplying connection with said air duct means for supplying air under pressure thereto when pneumatic threading is desired.

In a two-for-one twister textile yarn processing machine having a plurality of spindle assemblies each including a driven rotor mechanism having a generally vertically verticallly extending hollow axle member and a generally circular horizontally extending reserve disc device defining therewithin a generally L-shaped elongate yarn passageway therethrough, a stationary carrier mechanism for carrying a hollow supply package of yarn having a generally circular bottom portion and a hollow hub portion extending into the hollow yarn package and telescopingly receiving within the bottom thereof the hollow axle portion of said rotor mechanism and defining a gererally vertically extending yarn passageway in the upper portion thereof joining with the upper end of the rotor mechanism yarn passageway and a basket device upstanding from said bottom portion and surrounding the supply package of yarn, and a balloon restrainer device surrounding said carrier mechanism and having an aperture therethrough;

• the combination therewith of pneumatically operated threading mechanisms for automatically threading yarn withdrawn form the supply package through said passageways during threading-up of said spindle assembly and being characterized by a construction which eliminates the necessity of predetermined positioning of said rotor mechanism for the threading operation and provides for the supplying of air under pressure thereto only through stationary spindle assembly components, said pneumatically operated threading mechanisms comprising:
• selectively operated, air injector nozzle means formed in said stationary carrier mechanism and positioned at the juncture of said passageways and comprising an open cavity formed in said hollow hub of said carrier mechanism around said yarn passageway therethrough for receiving air under pressure, tube means forming a part of and an extension of said carrier mechanism passageway and extending through said cavity and into said rotor mechanism passageway in partial telescoping relationship, and said tube means being of smaller cross-sectional dimension than said rotor mechanism passageway for defining an annular gap between the telescoping portion thereof which communicates with said cavity for receiving air under pressure from said cavity around said tube means and into said rotor mechanism passageway for creating an air suction through said carrier mechanism passageway and a jet of positive airflow through said rotor mechanism passageway for pneumatically threading of yarn through said passageways;
• and
• means for selectively supplying air under pressure to said injector nozzle means regardless of the position of said rotor mechanism and comprising air duct means leading from the outer circumference of said bottom portion of said carrier mechanism and radially through said bottom portion and annularly through said hub portion to said cavity of said injector nozzle means, a source of air under pressure, a selectively movable connector member positioned for movement into and out of connecting engagement with said air duct means through said aperture in said balloon limitor device, an air conduit leading from said air source to said connector member, and a selectively operable valve means positioned in said conduit for being operated to allow the flow of air from said air source through said conduit and said connector means and into said air duct when said connector member is connected therewith for supplying air to said injector nozzle means.