250 (#326) ############################################ WOOLLEN AND WORSTED SPINNING (2) the gradual but permanent fall of the bobbins (without any interference with the 2" pick) as soon as the required built-up diameter has been attained. The action of the mechanism (Fig. 72) to give these two controls will readily be understood. For if the action of the “heart" be followed through, it will be found to give the 2" pick wherever the lifter plate with its bobbins may be (within its limit of movement). Further it will be realized that if the hand-wheel (1) be turned, then, through the screw (f), it will directly elevate or depress the bobbin-rail (g, g), according to the direction of rotation. Thus the slow rotation and withdrawal of this screw (f) from beginning to end of the spin-after the base layers of yarn have been laid on the spool-lowers the spools so that the yarn from the edge of the cap (), from the eye of the flyer, or from the traveller of the ring, is guided higher and higher upon the spool barrel until the required bulk of yarn has been well and truly built upon the spool. It will now be realized that in starting the building of the spool - (3) a short pick must be employed, gradually in- creasing to the long (2") pick; and (4) a suppression of the permanent fall of the bobbins until the 2" pick is attained. It will be noted that (3) is obtained by starting the friction roller (c) at the top position on the "monkey" (d), in which position it conveys the smallest possible traverse to the spool, and gradually increases this as it is lowered through (1) and (e) until it gives the full traverse (or 2" pick). It will be noted that (4) is the result of inactivity of the traversing screw (f) until the friction-roller (c) is in the position to give the full pick (2"). 250
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