127 (#181) ############################################ WOOLLEN YARN SPINNING must be kept as large as possible to maintain the highest possible speed of the carriage. Thus, if a very fine yarn requiring a lot of drafting-twist is being spun, rather than decrease the teeth in D, thus slowing down the carriage and the output of the mule, a larger slow-speed rim A may be employed to speed up the spindles during the draw. The arrival of the carriage at the extent of its traverse disconnects, through the half-revolution of the cam shaft, the drawing-out scroll clutch and at the B A N TOA Fig. 41a.-Control of Fast Speed Spindle Drive same time throwing the belt on to pulley 1 (Fig. 41) causes the fast-speed rim B to take charge of the spindles, thus putting in the twist required in the yarn as quickly as possible. The control of this motion is effected by a peg in a wheel driven through twist worm G (Fig. 41). This peg must cause the withdrawal of the driving belt from pulley I on to the loose pulley 2, thus stopping the turning of the spindles through the rim B and at the same time allowing the backing-off wheel c to come into action. (d) It should here also be noted that the twisting of the threads extending from the nip of the rollers to the 127
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