Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . , also, to have the point so much depressed. Thediagram given in Fig. 76, illustrates one of the best cams of this type. Almost invariably with a cam of this nature, a large pickpoint is used, and to correspond with it a very large cone is neces-sary, which means the expenditure of more power when in the outer end of the cone is considerably lower than the shaft,it is not an advantage, especially with such a large pick
Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . , also, to have the point so much depressed. Thediagram given in Fig. 76, illustrates one of the best cams of this type. Almost invariably with a cam of this nature, a large pickpoint is used, and to correspond with it a very large cone is neces-sary, which means the expenditure of more power when in the outer end of the cone is considerably lower than the shaft,it is not an advantage, especially with such a large pick point, as 125 112 WEAVING. it must of necessity give a hard pick, beside requiring more powerto lift it. Relation of the Cone Pitch. Unless the conp is in properproportion to the cam, uneven picking will follow. If the cone istoo small, it locks in the hollow of the pick point; if it is not taperedto the right pitch, only a small portion of the cone is in contactwith the cam. If it is too large, it does not enter the hollow of thecam, and a sudden motion is the result. For the best results, thecone should be set between the back and top centers of the cam, but. Fig. 76. Circular Pick Cam. slightly inclined to the top. If too near the top of the cam whenmotion is imparted to it, the cone slides away from the point, anddoes not receive the firm blow that gives a good pick. Whenplaced toward the back center of the cam, the point locks on thecone with very poor results. The cone ought to extend over theedge of the cam, when resting on the back center, at least three-quarters of an inch; the top of the cone should be almost level atthis point, so that when the cam works around, all, or almost all, ofthe outer end of the cone will be in contact with the point. Dogs on Picking Arms. There are three distinct kinds- of 126 WEAVING. 113 dogs used on the picking arms; (Fig. 77) A, B, C. A is certainlythe better; there is almost a straight pull on the lug strap, whichmeans that the strap w
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