222 (#294) ############################################ WOOLLEN AND WORSTED SPINNING The action of flyer and bobbin must be perfectly understood-actually felt-by the worsted drawer as he watches his spindles or he will rarely work to the best advantage. This action should be studied at three stages, viz., (a) In its simple form ; (6) In its simple form combined with the condition necessitated by the increase in diameter of the bobbin due to the layers of twisted sliver laid upon it; and (C) In its most complex form in which the basic principle is to be applied with due reference to increase in the diameter of the barrel of the bobbin (leverage) and also to the action of the lifter-rail which from beginning to end should lay the coils of sliver-if possible--closely against one another from the commencement of the empty bobbin to the completion of the full bobbin. The basic idea of the spindle and flyer will readily be understood by reference to Figs. 64 and 65. There are here three possible activities- 1. The sliver may be held taut, when on rotating the flyer the bobbin will be pulled round by the sliver passing from the flyer to the bobbin, and twist will be inserted into the sliver, which twist will distribute itself from the point where the sliver is held on the bobbin to the point where the sliver is next held say the nip of the front rollers ; 2. If on rotating the flyer the sliver is delivered sufficiently quickly the flyer will simply wrap the sliver round the bobbin, the bobbin standing still and no twist being inserted. 222
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