201 (#267) ############################################ WORSTED DRAWING MACHINES in the two-spindle gill-box in which the slivers on emerging from the front rollers are slightly twisted (see p. 200), and wound on to a bobbin. In Fig. 58 this machine is illustrated diagrammatically in elevation and plan. The calculations involved are so similar on the one hand to those involved in gill-box calculation and on the other hand to ordinary drawing-box calcu- lations that a brief statement of the calculations in- volved is all that is necesary: Back Roller Speed : 500 x 61 x 40 x 17 x 20 x 3 x tt 12 X 70 X 70 X 70 98 inches per minute. Faller Speed : 500 x 64 x 40 18 x ** =I12 inches per 12 X 70 X 18 minute. Front Roller Speed : 500 x 64 x 40 x (35) * If x tt 12 х 70 х бо - 477 inches per minute. Spindle Speed : 500 x 61 x 8 x 20 x 5 82 revs. per 12 x 63 x бо х 62 minute. Total Draft 484 • 98 4.87. Draft between Back Rollers and Fallers = 112 ; 98 = I'14 Draft between Fallers and Front Rollers = 484 • 112 =4'32. The Gauge Point should be worked out with the (35) wheel as the change wheel. 82 X 12 The turns per foot = 2:06 turns per foot. 484 The mangle lifter-plate control should be especially noted. The control of the lifter-plate to effect the re- 65 * A double-threaded screw is employed here, hence double the number of supporting fallers for the required faller speed. 201
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