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    • 31. 发明专利
    • Improvements in Spinning and Twisting Machines.
    • GB189816924A
    • 1899-06-02
    • GB189816924D
    • 1898-08-05
    • BOYD THOMAS ALEXANDER
    • BOYD THOMAS ALEXANDER
    • 16,924. Boyd, T. A. Aug. 5. Spindle apparatus; rollers and roller heads.- Improvements on the invention described in Specification No. 18,920, A.D. 1888. The spring holding- down hook 7 is provided with a brake block, so that, when left free, it will brake and stop the spindle. Normally it is held with its brake block out of action by reason of a projection on the vertical rod 1 engaging a horizontal arm of the hook. When the rod 1 is released automatically on the breakage of a thread, the top roller is raised, the driving-band 4 is slackened, and the brake lever 7 is applied to the wharve. As regards means for bringing the stop-motion into action by the hand of the operative, the rod 1 may be held in its lowest position by means of a cam lever, one end of which may serve as a thread-guide. Or the lever 2 carrying the tension pulley 3 may be disconnected from the rod 1, and the latter may be held in its lowest position by its own weight and that of its connected parts ; when it is desired to raise the roller and stop the spindle the vertical rod is raised and held in the raised position by a cam lever similar to that above referred to, the free end of which may serve as a thread-guide. The pulley 3 may be formed of two sheet-metal discs 3 , 3 , which are flanged at their edges to form the rim, and united together by their webs, which are perforated, the edges of the perforations in the one being folded around those of the other as shown in Fig. 5. Its axle takes within bushes 2 , 2 , adjustably mounted on the end of a forked lever, the ends of the bushes being formed each with a chamber for holding a felt washer or material saturated with lubricant.