Fiber guide conduit in an open-end spinning unit

An open-end spinning unit, comprising:

• a rotor housing having a rotor rotatably disposed therein for spinning fibers into yarn, and a sealing plate for sealing in airtight engagement said rotor within said rotor housing,
• an opening roller housing having an opening roller rotatably disposed therein for converting silver into fibers, said opening roller housing being formed by two members joined along a parting line,
• a fiber guide conduit disposed between and interconnecting said rotor housing and said opening roller housing for pneumatically conveying opened fibers from said opening roller housing to said rotor housing, said fiber guide conduit being of a one-piece integrally formed component drawn from a steel tube and comprising a fiber inlet portion for receiving opened fibers from said opening roller and a fiber outlet portion for delivering the opened fibers to said rotor, said fiber guide inlet portion being disposed adjacent said opening roller and including a beveled edge portion that is protected against wear by mineral dust and fibers clinging to the opening roller,
• said opening roller housing defining a first mounting location comprising a seating recess that includes an opening and a passage which communicates with said opening roller, said fiber inlet portion of said fiber guide conduit extending through said opening for receiving opened fibers from said opening roller through said passage, said opening being dimensioned to correspond to the external cross-section of said fiber inlet portion of said fiber guide conduit thereby providing a tight-fitted releasable mounting of said fiber guide conduit in said seating recess, said passage being disposed adjacent said fiber inlet portion and communicating entirely with said fiber inlet portion for uninterrupted pneumatic conveyance of opened fibers from said passage into said fiber guide conduit, said passage having an external cross-section that is smaller than the external cross-section section of said fiber inlet portion by at least one wall thickness of said fiber inlet portion a the junction of said passage and said opening defining a stop-shoulder against which said fiber inlet portion of said fiber guide conduit abuts in resting engagement, said fiber inlet portion being further secured at said first mounting location by a cover plate attachable to said opening roller housing, said cover plate enclosing said first mounting location and having a passage that conforms to the dimensions of said fiber guide conduit so that said fiber guide conduit extends therethrough in tight-fitted disposition, said parting line between said two housing members extending through said first mounting location,
• said rotor housing defining a second mounting location comprising a bore in said sealing plate for releasably mounting said fiber outlet portion therein, said bore conforming to the contours of said fiber outlet portion and communicating with said rotor, said fiber outlet portion of said fiber guide conduit extending through said bore for delivering fibers to said rotor, said fiber outlet portion being releasably mountable at said second mounting location, and
• means at said first and said second mounting locations for releasably sealing in airtight connection said fiber inlet portion and said fiber outlet portion of said fiber guide conduit to said opening roller housing and rotor housing, respectively, said sealing means including an O-ring adaptable to conform to the external contour of said fiber inlet portion and disposable in said seating recess of said first mounting location, said opening roller housing defining a sealing groove in said seating recess in which said O-ring is partially disposable for sealing engagement of said fiber inlet portion with said opening roller housing, said sealing means for said fiber outlet portion comprising a sealing nozzle disposed against said rotor housing on said fiber guide conduit,
• wherein said fiber conduit guide is easily disassembled from and assembled into the spinning unit by releasing and engaging said sealing means and dismounting and mounting said fiber guide conduit, respectively.

An open-end spinning unit having a rotor rotatably disposed in a rotor housing that is closed off airtight by means of a sealable plate, an opening roller housing having an opening roller rotatable therein, and a one-piece fiber guide conduit inserted between the opening roller and the sealable plate, characterized in that:

• the fiber guide conduit is an interchangeably disposed component drawn from a steel tube,
• the fiber guide conduit is releasably disposed in said opening roller housing and the fiber guide conduit is releasably disposed in a bore in the sealable plate;
• and
• sealing means are provided which assure an airtight connection of the fiber guide conduit both with said opening roller housing and with said sealable plate.