Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . rs of looms, arrange the train of gears sothat the change gear gives twice the number of picks as there are 160 WEAVING. 147 teeth in the gear, namely: a 40 gear will give 80 picks ; 45 — 90,and so oa. The above train is one of that order. On somemakes of looms, the ratchet gear is the change gear, and the num-ber of teeth determine the number of picks ; a 60 ratchet giving60 picks. Whether the train is arranged as above or not,
Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . rs of looms, arrange the train of gears sothat the change gear gives twice the number of picks as there are 160 WEAVING. 147 teeth in the gear, namely: a 40 gear will give 80 picks ; 45 — 90,and so oa. The above train is one of that order. On somemakes of looms, the ratchet gear is the change gear, and the num-ber of teeth determine the number of picks ; a 60 ratchet giving60 picks. Whether the train is arranged as above or not, it isbest to have a constant number; that is, a number, when multi-plied or divided, will give the picks or change gear required. Toobtain the constant, proceed as in the first calculation, leaving offthe change gear. A X X X E iSTTTTTTT^ = Constant 2,000 or 2 ^m n^/-^ ^ tt i B X D X F Change gear X Constant = Picks. Picks -=- = Change. A X X X E B X D X F ^ = .9832 .034 amount of take-up2m() Does the constant obtained agree with the principle carried out inthe first calculation ? Proof. We have a 26 change gear. 26 X 2 = 52 Picks. 52 -f- 2,=: 26 Fig. 100. Continuous Take-Up Motion. Continuous. Fig. 100 shows a continuous take up is a bevelled gear fixed on the bottom shaft, imparting motionto a second bevelled gear B. On the same shaft as B, is a siugleworm C. This is geared into a worm gear D; and through the 161 148 WEAVING. open gears E, F, G, H, motion is imparted to the cloth roll some looms there are more intermediate gears added, so as tocarry motion up to two or more fluted rollers that are placedunder or above the breast beam; but whatever is added, it is simplya continuation of the motion sliown on Fig. 100. A worm, is aspiral thread gear, and resembles a spiral ridge cut aiouud a worm gear, is almost like a spur gear, or what is commonlycalled an ordinary gear; but the teeth are set slightly on an angle,so as to mesh more perfect
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