144 (#200) ############################################ WOOLLEN AND WORSTED SPINNING 1 sliver is twisted and wound on to the receiving bobbin on the Ring principle. The arrangement of this frame is very interesting, and is illustrated in one of its forms in Fig. 45. The best frame of this type, however, has been designed by Messrs. Platt Bros., of Oldham. This is illustrated in Figs. 46 and 46a. "The main drafting action of the machine is effected by two pairs of drafting rollers, as in the many other machines of the type referred to, but the pièce-de- résistance of the machine is the twister tube.” This not only inserts the necessary false “drafting-twist," but by means of two “lugs ” gives the necessary flips” or “ tugs” during the “spindle-drafting,” thus imitating the action of the yarn slipping over the top of the spindle in the mule at every revolution (Fig. 46a at b). The tube is also so designed at its lower extremity that it presents the sliver at this point minus its false twist directly into the nip of the draft rollers, i.e. the drafting- twist is from a to b, as shown in Fig. 46a. The drafting rollers deliver the untwisted sliver to an ordinary ring and traveller attachment whereby the necessary final twist is inserted and the yarn wound on to suitable bobbins or cops. For this frame the slivers should be condensed 20 per cent. finer than for mule spinning, as only a small draft can well be employed. In adjusting draft and twist it is possible to alter (a) delivery, (6) twist, or (c) a and b combined. It is most usual to alter the delivery. It should also be noted that double-spinning (i.e. roving) cannot be employed on this frame, as the necessary twist must be inserted straight away for winding on. Frame yarns are usually less elastic than mule yarns. The machine is made in two forms one with 1 144
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