Abstract: A rotation speed control apparatus for a yam winding storage drum has a unit for driving the drum, and a scanning device for scanning the quantity of storage windings on the drum which provides signals proportional with the number of the storage windings. The scanning device includes a light source for generating light beams along optical paths guided so as to impact the surface of the storage windings wound on the drum. A plurality of sensors are arranged so as to receive a related light beam along a respective light path with a light intensity varying in proportion with the number of storage windings. A plurality of light guiding blocks are each arranged on a respective one of the optical paths between the storage windings and the sensors.

Abstract: The invention relates to a thread feeder device with continuously adjustable thread extraction tension for textile machines, particularly for textile machines having uneven thread consumption, with a storage body that carries the thread without slippage and is directly or indirectly actuated by a motor and whereon the thread, in order to form a storage reserve winding, is wound tangentially and (according to requirements) is unwound axially between its front face, provided as a braking surface, and a complementary braking surface that rotates in the same direction. According to the invention, the complementary braking surface is formed by a thin, flexible circular disk the diameter whereof is slightly larger than the diameter of the front face of the storage body. The elasticity of this disk is used to achieve a more uniform thrust pressure on each point of the braking surface of the storage body, and to secure the thread more or less tightly by means of a more or less intense thrust pressure, i.e.