ROVING FRAME FOR PRODUCING A ROVING YARN WOUND ONTO ROVING BOBBINS AND METHOD FOR OPERATING THE ROVING FRAME

摘要

The present invention relates to a roving frame (1) and a method for operating the roving frame (1), which has a suction device with a negative pressure source (31) for cleaning the face (8) below the drafting arrangement (2). According to the invention, the negative pressure source (31) has an exhaust fan (11) and an electric machine (19), a centrifugal mass (7) is present for storing kinetic energy and is mechanically coupled to the electric machine (19), and control means (32) are present to control the electric machine (19) in such a way that the exhaust fan (11) is alternately operated at a nominal rotational speed and at a rotational speed, which is reduced compared to the nominal rotational speed, wherein the centrifugal mass (7) stores so much energy at the reduced rotational speed that the kinetic energy ensures the supply of selected electric loads (26, 27, 28) of the roving frame (1) with electrical energy for a predetermined time period. (Fig. 1)