. Yarn and cloth making; an economic study; a college and normal schools text preliminary to fabric study, and a reference for teachers of industrial history and art in secondary and elementary schools. biG. 84. — Jacquard Mechanism A series of vertical hooks {H) connect with the heddles of the loom. These areraised according to a pattern punctured on pattern cards (PC) by a seriesof horizontal needles (N) attached to them at their points of the pattern cards press back certain horizontal needles they carrythe hooks with them beyond the griff (G). This allows the grifi to riseand
. Yarn and cloth making; an economic study; a college and normal schools text preliminary to fabric study, and a reference for teachers of industrial history and art in secondary and elementary schools. biG. 84. — Jacquard Mechanism A series of vertical hooks {H) connect with the heddles of the loom. These areraised according to a pattern punctured on pattern cards (PC) by a seriesof horizontal needles (N) attached to them at their points of the pattern cards press back certain horizontal needles they carrythe hooks with them beyond the griff (G). This allows the grifi to riseand carry up the remaining hooks which raise the heddles. WEAVING TYPES shedding apparatusplaced on topof loom totake theplace of thedrawboy andpulley-box(24,26e,f,g).(i) shaft-heddles.(2) chainof perforatedpatterncards,revolving prismor cylinderwhich of hori-zontal needleswith eyelets,n-eedle board,series of verti-cal hookspass-ing throughneedles andcontrolled bythem,bottom board,griff,necking A Fig. 85.— The JacquardAT Work Action of horizontal needleon vertical hook when itis pushed back by patterncard. The needle carriesthe hook off the griff. 196 YARN AND CLOTH MAKING leash, or leash strings with mails and lingoes. comber — Hand and Foot (31, 31a).Process — Shedding. 1. pattern card passed over cylinder and pressed against needles. 2. blank spaces on cards push back certain needles, giving attached hooks an incKnation. 3. griff rises, carrying up hooks remaining vertical. 4. rising hooks carry up leash cord with warp strand it controls. 5. cyHnder bearing pattern card moves away and turns one fourth revolution, while springsreturn needles to normal position. Economic Gain In production: Less time for simpler tie-up of shedding mechanism, More rapid weaving possible. Less floor space needed. One worker instead of product: Still more elaborate pattern. Greater width of web. BIBLIOGRAPHY 1 Barlow, A. History
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectweaving
