The input carriage (3) of the crosslapper - of the lapper carriage to move back and forth, comprising a movable front belt (2), a rear movable belt (4) associated with the front belt and the turning means for turning over a textile web of fibers (1) during its transfer of the front belt on the rear belt. The turning means comprise a guide roller (18), vacuum, and a wall of the cladding (40) which makes it possible to compress said textile web of fibers (1) against the guide roller (18) in the curved portion of the roller 6 which the textile web of fibers makes its turn half -. Said guide roller (18) is provided on its periphery with longitudinal grooves or circumferential corrugations which define at the surface of the guide roller of the longitudinal channels or circumferential adapted to contain and channeling the air is expelled from the web (1) during its compression between the guide roller (18) and the wall of the cladding (40).
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