. Appleton's dictionary of machines, mechanics, engine-work, and engineering. SCREWS, MACHINE FOR THREADING. 599 ?within the jaws by the motion of the carrying-wheel. And after being turned, the further motion ofthe wheel carries them up, their heads resting on to a curved rest c2, which is so curved at d? as to per-mit them to fall out by their weight so soon as they reach the top. By doubling the length of the carriage, and putting another carrying-wheel on the other end of theshaft, as represented in Figs. 3267 and 3268, and putting up a duplicate of the mandrel, gripping-jaws,and cutting t
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. SCREWS, MACHINE FOR THREADING. 599 ?within the jaws by the motion of the carrying-wheel. And after being turned, the further motion ofthe wheel carries them up, their heads resting on to a curved rest c2, which is so curved at d? as to per-mit them to fall out by their weight so soon as they reach the top. By doubling the length of the carriage, and putting another carrying-wheel on the other end of theshaft, as represented in Figs. 3267 and 3268, and putting up a duplicate of the mandrel, gripping-jaws,and cutting tools, with their connections, the cam-shaft and cams will answer for two machines, withthe exception of the cutter-cams, which must also be doubled to avoid complexity; but even these maybe dispensed with by changing the form of the cutter-stock and the slide that communicates motionto it from the cutter-cam. SCREWS, MACHINE FOR THREADING: John Crums. Figs. 3270, 3271, 3272, 3273, and nature of this invention consists in giving a reciprocating motion to a carriage, in which is hung theshaft of the carrying and holding wheel to draw the stem of the blank from the dies as they rotate togive the pitch to the thread, and to return it to the dies for a succession of operations until the thread iscut, this series of motions being given by a simple segment cog-wheel, the cogs of which act alternatelyon an upper and a lower rack connected with the carriage. And also in giving to the carrying audholding wheel an intermittent rotary motion (to remove a threaded screw and present a blank) from awheel below, provided with a pin on its face, which, at every rotation, lifts a lever, the upper end ofwhich is provided with a hand that acts on the teeth of a ratchet-wheel on the shaft of the carrying-wheel to turn it the required distance for the presentation of a blank, the wheel that carries the
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
