Abstract: An open-end spinning machine having an open-end spinning unit with novel apparatus for withdrawing impurities released in the spinning unit. An impurity releasing duct outlet of the sliver separation housing of the open-end spinning unit extends from said housing and has substantially the same cross-sectional inner height dimensions as those of the cleaning aperture, while a connecting tube inlet joined to said outlet is substantially conically flared, a gap being provided between said outlet and said inlet for the sucking-in of additional air.

Abstract: A method of and apparatus for removing dirt particles from staple fibers and straightening the resulting clean fibers in an open-end spinning unit which includes means for feeding sliver, fiber opening means, and means for twisting the thus cleaned and opened fibers. Fibers together with dirt particles contained therein are accelerated by the opening action and are exposed to a first air flow which, by its deceleration due to its expansion, separates the dirt particles from the fibers. Immediately thereafter, the thus cleaned fibers are exposed to a second air flow by which they are straightened due to an acceleration imparted to them by said second air flow.In the apparatus of the invention there are provided three sectors, viz. a fiber opening sector, a dirt discharging sector, and a fiber straightening sector, in that order, the dirt discharging sector merging with the fiber straightening sector via a widened mouth.

Abstract: Apparatus for supplying a staple fiber formation, such as a fibrous sliver, to a fiber separating device in an open-end spinning unit provided with a combing-out cylinder adapted to cooperate with a feed roller and with a pivotally supported pressure shoe thrust toward said feed roller. The apparatus has a pivot shaft supporting the pressure shoe, the pivot shaft carrying a swingably arranged link which is provided with a cutout to receive a guide member, and with stops for stop members provided in an arm carrying the pressure shoe.The arm is preferably provided with a slit and with a safeguarding member for maintaining the position of the stop members.