. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ore slow. This is themethod, or principle of retarding the copping motions of the bobbins. It has been shown,however, that the rotation of the bobbins should be also retarded in a progressive object is effected by means of the cone k, which, as the band n progressivelyapproaches towards its smaller diameter, drives the pulleys or whorls q of the bobbinswith decreasing speed, though itself moves uniformly quick with the shaft c. To effectthis variation, the cone is shifte
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ore slow. This is themethod, or principle of retarding the copping motions of the bobbins. It has been shown,however, that the rotation of the bobbins should be also retarded in a progressive object is effected by means of the cone k, which, as the band n progressivelyapproaches towards its smaller diameter, drives the pulleys or whorls q of the bobbinswith decreasing speed, though itself moves uniformly quick with the shaft c. To effectthis variation, the cone is shifted lengthwise along its shaft, while the band runningupon it remains continually in the same vertical plane, and is kept distended by theweight of the pulley 0. The following mechanism serves to shift the cone, which maybe best understood by the aid of the figures 340, 341, and 337. A long cast iron bar m3, 366 COTTON MANUFACTURE. which bears two horizontal projecting puppets, o3 o3, is made fast to the front uprightface of the copping beam A. Through the above puppets a cylindrical rod n3 passes freely, 340. II — ---^Mfaq 1 1 lJ> v*-* which is left out in fig. 337, that the parts lying behind it may be better seen. Uponthis rod there is a kind of fork, ps p3, to which the alternating rack bars 53 are madefast. The teeth of these racks are at unequal distances from each other, and are soarranged, that each tooth of the under side corresponds to the space between two teethin the upper side. Their number depends upon the number of coils of roving that maybe required to fill a bobbin ; and consist? in the usual machines of fftjm 20 to 22. Therod h3 may be shifted in the puppet o3, like the fork ^3 of the rack-rod, upon the rodn3, and along the surface of m3, where two wings ws m3 are placed, to keep the fork ina straight direction. Upon the bar Tn3, there are the pivots or fulcra of two stop catches«j3 j-3, of which the uppermost presses merely by its own weight, but the unde
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
