Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . n Doiible Lift and Single Cylinder Machines. if the machine is an old one, or if deep blades are used in the grifPe. DOUBLE ACTION MACHINE This means that there are two griffes and two cylinders. Thesame methods are used to operate the moving parts, as are used onthe single action machines, but the lever and arms are used in acompound manner. This machine is undoubtedly the best, wherelarge reproduction is aimed at, for it can be
Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . n Doiible Lift and Single Cylinder Machines. if the machine is an old one, or if deep blades are used in the grifPe. DOUBLE ACTION MACHINE This means that there are two griffes and two cylinders. Thesame methods are used to operate the moving parts, as are used onthe single action machines, but the lever and arms are used in acompound manner. This machine is undoubtedly the best, wherelarge reproduction is aimed at, for it can be run 170 or 180 picksper minute. The illustration. Fig. 24, shows a double actionmachine. The shedding motion is obtained by means of a double crankfixed on the end of the pick cam shaft, and to which the long lift- 302 JACQUARD INIACHINES 25 ing rods are attached. This is shown in Fig. 25. Cams havebeen used to take the place of the double crank, so as to allow adwell for the shed while the shuttle is passing through. It is par-ticularly desirable in a broad loom to have the shed full open fora longer period in order to give clearance for the shuttle, but the. cam motion was proven to be somewhat detrimental, owing to thequick rise and fall of the harnesses, which causes the lingoes tojump and to be constantly breaking off. The neck cords also wereconstantly breaking. The cam movement could be used success-fully with a Jacquard that had not many harness threads attached 303 26 JACQUARD MACHINES ^ Fig. 25. ^ ^ fis R to the neck cords, and had heavier lingoes fixed to the harnesses, but for general use, the double crank is best, as it gives a more even movement. There is also a short dwell while passing around the extended part of the crank. The time to set the crank is to have it level, thatis, the two extreme points horizontal, w^hen the crankshaft is a little ahead of the bottom center, or to havethe reed about li inches from the cloth when theshed is level. Owing to the gene
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