207 (#275) ############################################ WORSTED DRAWING MACHINES It will further be realized that the variable bobbin speed may involve- (c) a variable, positive but delicate control of the lifter-plate action, in order that a solid, level bobbin may be built up, this being made the basis of the exact changes required, these changes being directly or indirectly effected by the cones ; and (d) variation as required in the indirect action of other parts of the cone-box-such as in the twist inserted --made possible through the delivery with which even fine rovings can be laid on the bobbin with practically no strain at all. The cone drawing or roving box, although not as complex as the mule, has already been treated in nomograph form so that all that need further be illus- trated here is the general plan of a typical box in order that the criticisms which are made in the succeeding chapter may be fully appreciated. In Fig. 61 a plan of such a box is given, by means of which the following prime functions may be realized- I. The constant drive of the front rollers ; 2. The constant drive of the flyers; NOTE : (I) and (2) being constant maintain a constant delivery and twist to the sliver being treated. 3. The direct drive to the bobbin back through the crown wheel; and 3a. The modification of the direct drive of the bobbin by the crown wheel driven through the cones ; а. 205
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