. Journal of electricity, power, and gas . As D passes the line AI of crank and link straightened, thebar reaches its lowest position. As D moves on to its limit ofmotion at F the bar is raised an amount GH, forming the loopfor the shuttle. Now it is not necessary for the needle bar toreturn to G, but on tarrying a moment raised to // for the shuttlepoint to fairly enter the loop, it may reasonably enougli continueon its upward journey. By a cam it would be given this action,but by the link-work of Fig. 4 it must return to the lowest pointagain before making its ascent. Now, if this drop by th
. Journal of electricity, power, and gas . As D passes the line AI of crank and link straightened, thebar reaches its lowest position. As D moves on to its limit ofmotion at F the bar is raised an amount GH, forming the loopfor the shuttle. Now it is not necessary for the needle bar toreturn to G, but on tarrying a moment raised to // for the shuttlepoint to fairly enter the loop, it may reasonably enougli continueon its upward journey. By a cam it would be given this action,but by the link-work of Fig. 4 it must return to the lowest pointagain before making its ascent. Now, if this drop by the amount HG, after the shuttle entersits loop, is fatal to the machine, the proposed link movementmust be abandoned; otherwise it may be accepted, giving a muchlighter-running and more durable combination than if the camand pin be adopted. Example II: Another interesting case of this is found in, theCorliss valve gear, where the rocker plate swings to carry thepin D, Fig. 5, back and forth from H to F. The valve and stem. ^^. ff B are moved by the lever BE as it swings from //; lo U moves from ./ Id /• and return the valve is ojiencd andclosed, while from / lo // and back it remains, closed, but iscompelled to be moving slightly, due to the arc JDII. If thismovement represeiUed by DK were out of the question, the link-work of Fig. 5 would have to be rejected; olJier-wise it may be accepted, as in fact it has been by hundreds ofdesigners following in the looisteps of George II. Corliss. 130 JOURNAL OF ELECTRICITY, POWER AND GAS [ Vol. XXIV—No. 6
Size: 2322px × 1076px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
