Principles of worsted spinning, Book PDF, ePub eBook

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Book Descriptions:
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. 1921 Excerpt: ...into the extended roving until it is strong enough to be wound on to the bobbins. 4. By three different means, in the three different types of frame, the yarn is wound on to the bobbin during the whole time the spindle is rotating. In this winding-on process it receives the drag which is necessary to build a firm bobbin, but from the nature of things the drag is not uniform, and there are consequent disadvantages. In early hand-spinning, each of these three processes were separate, and in the one-thread wheel the winding was not continuous. In the Saxon wheel winding became automatic and dependent on the arrangement for introducing twist, but it was not till a hundred years after the introduction of the Saxon wheel, that any attempt was made to make the drafting automatic as well. For an intelligent understanding of the practice of machine spinning, the relations of drafting, twisting, and winding on are quite as necessary as an understanding of the theories which underlie each of these separate movements. Three objects are attained in all throstle frames. 1. By a simple arrangement of pegs on which the roving bobbins stand in such a manner, that the drag of the back rollers unwinds the roving from the bobbins with very little strain. The only thing that need be said of them is that the less strain which is put upon the roving the better. 2. As in all other drawing or drafting processes, draft depends entirely on the relation of the output of the back rollers to the output of the front rollers. 3. The twist depends on the number of turns made by the spindle during one revolution of the front roller. 4. The winding-on depends on the construction of the spindle and its adjuncts, and on the movement of the lifting motion, which continually alters the position ...

Principles of worsted spinning, by Howard Priestman

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