Cotton weaving: its development, principles, and practice . or type of the machine, its chiefparts are essentially the same, however modified foradaptation to particular requirements. The accompanying illustration, fig. 121, represents astandard make and type of jacquard, containing 400needles and one cylinder, and arranged for what is termedthe double lift: that is, it is a 400 needle machine, butinstead of having only 400 hooks it has 800 or two toeach needle, and also two griffes instead of one. Thismachine is extensively used in weaving cotton goods andall fabrics in which high speed is de
Cotton weaving: its development, principles, and practice . or type of the machine, its chiefparts are essentially the same, however modified foradaptation to particular requirements. The accompanying illustration, fig. 121, represents astandard make and type of jacquard, containing 400needles and one cylinder, and arranged for what is termedthe double lift: that is, it is a 400 needle machine, butinstead of having only 400 hooks it has 800 or two toeach needle, and also two griffes instead of one. Thismachine is extensively used in weaving cotton goods andall fabrics in which high speed is desirable, as it can beworked to shed for 200 picks per minute, though notmore than 160 to 180 are recommended. 192 COTTON WEAVING. The jacquard, it will be seen from the illustration,consists of an iron frame which stands about eighteen incheshigh, its lateral dimensions varying according to thenumber of hooks and needles it contains. In this frameare mounted the working parts which are actuated throughvarious connecting rods, shafts, and levers, from the. Fig. 121.—Double-lift Jacquard 400s, one cylinder. crank and second motion shafts of the loom. The cordsseen upon the ground of the illustration are termed theneck-bands or neck-cords. These are looped upon the tail-pieces of the hooks of the jacquard, otherwise their lowerextremities. They are then passed downward, occasionallythrough a perforated board at the bottom of the frame THE DEVELOPMENT OF THE SHEDDING MOTION. 193 called the bottom board. In modern makes of jacquardsthis board, on which the hooks rested when out of action,has been superseded by some bars or blades, termed hookrests. This avoids the wear and tear of the neck cordswhich took place with the boards. The cords are attachedby a slip-knot to the leashes or harness, as shown pre-viously in fig. 106, p. 151. The slip-knot is to permit of aperfectly level adjustment being made of theharness-mails. The following are the principal parts of thejacquard: 1st. Th
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