Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . wing down of the speed ofthe lay at this time; unless tremendous power were applied to thepick motion. Even with eccentricity, it is difficult on some loomsto get the shuttle clear of the shed. mainly owing to theshort range of the crank, and the size of the shuttle being toogreat. There is a general impression that the slowing down of thelay is caused by the pick motion, but that is not so, although apick motion that is
Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . wing down of the speed ofthe lay at this time; unless tremendous power were applied to thepick motion. Even with eccentricity, it is difficult on some loomsto get the shuttle clear of the shed. mainly owing to theshort range of the crank, and the size of the shuttle being toogreat. There is a general impression that the slowing down of thelay is caused by the pick motion, but that is not so, although apick motion that is fixed so as to give a hard blow, will tend tocheck the lay, but this is the result of faulty fixing. It would be well if the loom makers would construct the layswords so that they could be altered to do the best of work onvarious fabrics ; instead of having the lay sword fixed direct to the 143 130 WEAVING. rocker shaft have a bracket with slots in it attached to the shaft,and the swords bolted to the bracket. This would admit of thechanging over of the loom from fine to coarse goods or heavyfabrics. In manufacturing coarse goods a little larger shuttle should. Fig. 89. Diagram Descriptive of Beating Up. be used, owing to the necessity of having more filling on the bobbin,or a larger cop; in this case a slight increase of eccentricity wouldallow a slightly longer time for the larger shuttle to pass throughthe shed, without noticeable increase of power on the pick, also 144 WEAVING. 131 with less possibility of breaking out the side ends. For coarseor heavy goods a firmer beat up is required to help in the makingof the heavier fabric, and nothing would be lost because of a littleextra time for the shuttle. The eccentricity of the lay is caused by the crank shaft beingon a higher or lower plane than the connecting pin of the crankarm of the lay. Fig. 89 shows a diagram representing the layconnected to the crank shaft. A sectional view has been madeuse of, cut through the lay swor
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