123 (#177) ############################################ WOOLLEN YARN SPINNING F! C. Mechanical Control in Mule Spinning. The requirements of mule spinning are best realized by spinning upon the wheel and by actually carrying out the six operations already referred to on p. 106. These operations are worked out by the modern mule following an ingeniously devised cycle of move- ments. It is well to keep in mind that in the mule cycle there are two marked stages of control, viz. the arriving in and the arriving out of the carriage : at both of these stages in the cycle of operations marked changes, if not actually then and there effected, are started. This, perhaps, is the first point to be noted in studying the mule. The cycle of operations in Woollen Self-Acting Mule Spinning may be stated as follows:--- (a) delivery of condensed sliver from the front rollers to the spindles ; (6) recession of the mule-carriage approximately at the rate of delivery of the condensed sliver ; (c) insertion of (1) supporting or drafting twist during the outward movement of the carriage; (2) final twist (double speed) on the completion of the outward movement of the carriage ; (d) the movement inwards of the carriage to com- pensate for the "take-up” in the twisting of the slivers ; or, the delivery from the rollers of a little more of the condensed sliver to allow for the "take-up” in twisting; (e) backing-off,” to give the " faller-wire” control of the thread in order that it may finally guide it in the required manner to build it up into a firm cop or bobbin ; () descent of faller-wire and ascent of weighted counter-faller-wire, the latter suitably tension- ( 123
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