The London Journal of Arts and Sciences Volume 11 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1826 edition. Excerpt: ...and the upper roller is to turn in a groove in the periphery of the lower roller, for the purpose of confining the substance, that the outer filaments may not be broken. A pair of these improved rollers are shewn in the front view, fig. 19, the enlarged diameter of the upper roller, a, falling into the groove of the lower roller, b. Instead of placing these rollers in the machine in pairs, that is, the upper one immediately over the lower one, it is intended to make one upper roller, a, fig. 1,8, bear upon two lower rollers, 6, i, the intention of which is, that the filaments of whatever material is operated upon may be held at two points. Or there may be two upper rollers, and three under rollers, which will have the same effect, the object being to employ rollers with smooth surfaces, and to bold the material at two points. Though the operative parts of a machine for drawing flax, wool, &c. are shewn at fig. 18, yet the patentee does not claim any novelty iu the mode of driving the rollers of such a machine, they may be actuated in various ways. In this instance bevel pinions are placed upon the rotatory shaft, c, which take into bevel wheels at the ends of the axles of the lower drawing rollers; and these wheels and pinions having variable numbers of teeth, the rollers are consequently turned with different velocities, so as progressively to stretch or extend the filaments as they advance, which is the ordinary drawing process. After the filaments have been drawn, that is, extended by passing through the series of drawing rollers, the slider is conducted over a guide-roller, d, and between the delivering rollers, e, down to a can, to be placed below, which is the ordinary mode of receiving the roving, previously to carrying it to the spinning...