Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . 6666 Fig. 70. Roller Motion. taking into consideration the shaft from which the power is pick cam shaft travels half the speed of the crank shaft, so thattwo picks of the pattern are placed in the cloth while the pick camshaft revolves once; thus the gear fixed to the shaft must contain JJ7 106 WEAVING. two and one-half times less teeth than the gear on the shedding camshaft, that is, for a five end satin or twill clo
Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . 6666 Fig. 70. Roller Motion. taking into consideration the shaft from which the power is pick cam shaft travels half the speed of the crank shaft, so thattwo picks of the pattern are placed in the cloth while the pick camshaft revolves once; thus the gear fixed to the shaft must contain JJ7 106 WEAVING. two and one-half times less teeth than the gear on the shedding camshaft, that is, for a five end satin or twill cloth. (See Fig. 72.) If there is a gear of 70 teeth on the shedding cams, and a gearof 35 teeth, one-half the size, is placed on the pick cam shaft, thecams would travel at the rate of one revolution to four of the crankshaft, which would leave one pick out of the pattern. But if a 28-tooth gear drives the 70, there would be one revolution of the camsto five of the crank shaft. I. B ? ? ? ? ? ? ? 1 B Fig. 72. Harness Sateen or Twill Cam. Example. There is a 30 driving gear on the crank shaft, im-parting motion to a 60 gear on the pick cam shaft; a 28 gear onthis shaft drives a 70 on the shedding cam shaft. If there is a four-pick pattern, what number of teeth should thegear contain using three of the above gears ? Ans. A 56 on the shedding cam shaft. THE PICKING nOTION. This is the motion that consumes about y^of the power requiredto drive an ordinary easily running loom. A careful overseer or ii8 WEAVING. 107 fixer should see that this motion is giving the best results for thepower expended. It is a very easy matter for the pick motion to beso fixed that the loom actually takes ^ horse-power more to run itthan would be necessary if the motion were set correctly. As already stated, some fixers believe that the pick motioncauses the uneven movement of the lay. It is undoubtedly a fact•that through the faulty setting of the pick motion the lay is
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