Sliver condenser for a fiber separating device of open-end spinning units

Sliver condenser for a fiber separating device of open-end spinning units. The condenser comprises a combing-out cylinder and a sliver supplying mechanism associated therewith, such supplying mechanism consists either of a pair of feed rollers or of a feed roller cooperating with a pressure shoe between which the sliver discharged from the condenser is compressed. The cross-sectional area of the sliver condenser duct continuously diminishes from the intake to the outlet port thereof. At least within a portion of the duct length, the dimensions of the duct cross-sections parallel with the feed roller axis are greater than the maximum widths of the respective cross-sections perpendicular to the last-mentioned dimensions so that at least within said portion of the duct length the two opposite duct walls are wider than the two other opposite duct walls, while within one and the same duct cross-section the cross-sectional width continuously or gradually varies so that the maximum width of the cross-section is adjacent at least one of the opposite duct walls.