File:Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869) (14764775205).jpg

Identifier: appletonsdiction02newyuoft (find matches)
Title: Appleton's dictionary of machines, mechanics, engine-work, and engineering
Year: 1869 (1860s)
Authors:
Subjects: Mechanical engineering
Publisher: New York, Appleton
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: MSN

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ends 01these rods are rounded, and enter sockets in the under face of the ends of the journals, so that whenbrought under either of the journals, when the levers are raised by the cams, the journals will be ele-vated. As there are two journals for each trap-board, and these are alternately elevated with therorresponding trap-board, the lifting-rods must be alternately shifted from the one to the other. A.8 th<» LOOM, CARPET-WE AVI X<,. 303 rods are so jointed as to incline outwards, when vibrated they will fall, by gravity, against the outerends of the slots p, which are so located as to hold the rods in a position t catch under the two outerjournals >t ang /. In this position, when either of the trap-boards are elevated, one of the journals will be carried upwith it; but when the other journals are to be lifted, the rods 6 are to be shifted from the outside jour-nals to the inside ones, and this is effected by cams r r s s, two on each side of the frame, and on oim
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504 LOOM, CARPET-WEAVING. two of the jacquard-shaft, the levers w and x will act upon the corresponding rods d at every alternatedescending motion of each trap-board. The form of the cams f and s is such that during one rotation of the jacquard-shaft m, they elevateone set of levers to to, to shift the two corresponding rods d d from one journal to the other, and duringthe next rotation of the jacquard-shaft they recede to permit these rods to fall back, whilst the otherset of levers x x shift the other two rods d d from one to the other of the other set of journals, thenext rotation liberating these and shifting the first set. In this way it will be seen that during oneoperation, when the trap-board c descends, the journal g descends with it, the trap-board b at the sametime being carried up and down with the journal e. At the end of this motion the cams r1 r throw outthe levers w w, which shift the rods d d to the journal /; at the next operation the trap-board e 13

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