Cotton weaving: its development, principles, and practice . ave theirfulcrum some distance away from the centres of thejacquard. The consequence is that as the ends of theselevers in lifting the griffes and returning them to theirposition pass through a small arc of a circle, and insteadof lifting them vertically, pull them against their guidebearings inducing friction, wear and tear, and the expendi-ture of considerable power in order to overcome it. Thesedefects having engaged the attention of Mr. Brierley,manager for Messrs. Swainson and Birley, Preston, hehas endeavoured to remedy them and
Cotton weaving: its development, principles, and practice . ave theirfulcrum some distance away from the centres of thejacquard. The consequence is that as the ends of theselevers in lifting the griffes and returning them to theirposition pass through a small arc of a circle, and insteadof lifting them vertically, pull them against their guidebearings inducing friction, wear and tear, and the expendi-ture of considerable power in order to overcome it. Thesedefects having engaged the attention of Mr. Brierley,manager for Messrs. Swainson and Birley, Preston, hehas endeavoured to remedy them and has succeeded. Hisimprovement is illustrated herewith, fig. 137, and, as will THE DEVELOPMENT OF THE SHEDDING MOTION. 209 be seen, the horizontal levers are dispensed withy a rackand pinion arrangement taking their place. The machineis actuated as before from the tappet shaft of the loom,one end of which carries a crank disc to which the con-necting rod is attached. The top of this rod is secured toan adjustable link which is connected with the lower end. Fig. 137. of a vertically sliding bar, the upper portion of whichconstitutes a rack. Into this rack gears a pinion carriedupon the end of a shaft extending across the top of thejacquard frame and supported upon it. Over the middleof the jacquard frame, upon this shaft, is another pinionwhich gears into the two racks as shown, and throughthem operates the jacquard. p 210 COTTON WEAVING. It will be seen that the lift thus obtained is a perfectlyvertical one, and that connection between the two griffesconstitutes them each a counterpoise of the other, whichresults in a much easier drive. The outside rack andconnecting rod find their counterpoise in the action of thespiral spring shown. The result may be summed up in a few sentences. Thedriving, with this new arrangement, absorbs much lesspower than under the old form; wear and tear is greatlydiminished; all the destructive vibration through theloom is obviated, by which the brea
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisheretcet, bookyear1895
