Device for preventing accumulation of fibers in a spinning machine

A device for preventing accumulation of fibers in the space between the free lateral surfaces of a feed roller and a combing roller and the inner surface of a closure plate covering the feed roller and combing roller in a spinning machine. A groove is formed on the inner surface of the closure plate extending in opposition to at least portions of the free lateral surfaces of the feed roller and combing roller and one end of the groove is connected to an air suction source, either to a channel for feeding combed fibers to a rotary spinning chamber, or to a duct which conducts the air exhausted from a rotary spinning chamber. The air current produced in the portion of the groove which covers the free lateral surface of the combing roller is substantially in the same direction as the direction of the air current produced by the rotation of the combing roller in the portion of the space which is opposed to the groove.