. The principles and processes of cotton yarn manufacture. eliv-ered. Consequently one calculation only is given here. Bxample:—Find the weight per yard of the sliver delivered, if theweight per yard of each of the laps fed is 280 grains, the draft is ,and the waste 20 per cent. 280 X 6 x .80 Weight per yard of sliver = = grains. V. Production. The production is calculated from the surface speed of the coiler cal-ender rolls. An allowance of about 5 per cent, should be made Bxample:—Find the production of a comber for 58 hours if the sliverbeing produced weighs 40 gra
. The principles and processes of cotton yarn manufacture. eliv-ered. Consequently one calculation only is given here. Bxample:—Find the weight per yard of the sliver delivered, if theweight per yard of each of the laps fed is 280 grains, the draft is ,and the waste 20 per cent. 280 X 6 x .80 Weight per yard of sliver = = grains. V. Production. The production is calculated from the surface speed of the coiler cal-ender rolls. An allowance of about 5 per cent, should be made Bxample:—Find the production of a comber for 58 hours if the sliverbeing produced weighs 40 grains per yard, the speed of the machine is 90nips, and the change gear on the coiler-connecting shaft is the same, asbefore, namely, 75. Production in pounds ^ 90 X 60 X 2 X X 60 X 58 X 40 X .95 75 X 36 X 7000 = CHAPTER VII FLY FRAMES The machine used directly after the last drawing frame is the first ofa series of machines classified as fly frames. In the language of themill they are also called speeders and roving frames. The number of. Fig. 93a. this sort of frames used varies from two to five according to the finenessof the yarn to be spun. They are all very nearly alike in construction,differing from one another mainly in size. The first is always called a 134 COTTON YARN MANUFACTURE slubbing frame or a slubber. If two frames are used the second ismerely called the roving frame. If three or more are used, the second iscalled an intermediate, the third the roving frame, or second inter-mediate, and the fourth a jack frame. A slubber receives the cotton inthe form of a sliver from the drawing-frame cams, and delivers it in a
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