| 摘要 |
PURPOSE:To lessen frictional resistance between a driving part such as belt, pulley, etc., of belt transmission mechanism and to reduce loss of power, by making a chamber equipped with the belt transmission mechanism in reduced state in driving of spinning frame. CONSTITUTION:A solenoid valve set at the lower part of a cover 15 is opened, a vacuum pump is operated and air in a chamber 17 is sucked and discharged. When pressure in the chamber 17 reaches a desired negative pressure, the solenoid valve is closed and a drive motor 1 is operated. An output shaft 3 is rotated at high speed, the rotation is transmitted through a V belt 11 to a variable- speed pulley 8 and a spinning frame is operated. Frictional resistance between the belt 11 and pulleys 4, 8, etc., and air is lessened. |
