. The principles and processes of cotton yarn manufacture. Fig. 61. have been done, the brackets supporting the grinding rolls are adjustedand the grinding rolls set by means of a thin gauge as near to thecylinder and doffer as possible, without being allowed to touch. Each rollis then set a little nearer, being allowed to touch the wire very closeness of the contact is determined by sound and some little prac-tice is needed before the proper setting distance can be obtained. In nocases should the contact be close enough to allow sparks to fly, and it is agood general rule that lig
. The principles and processes of cotton yarn manufacture. Fig. 61. have been done, the brackets supporting the grinding rolls are adjustedand the grinding rolls set by means of a thin gauge as near to thecylinder and doffer as possible, without being allowed to touch. Each rollis then set a little nearer, being allowed to touch the wire very closeness of the contact is determined by sound and some little prac-tice is needed before the proper setting distance can be obtained. In nocases should the contact be close enough to allow sparks to fly, and it is agood general rule that light grinding at frequent intervals is much prefer-able to heavy grinding at longer intervals Fig. bi shows a card ready for grinding. CHAPTER V DRAWING On especially high-class work, whose market price warrants the addi-tional expense incurred, it is customary to use a process known as combing. When combing is not used, the machine which follows thecard is either a railway head or a drawing frame. There are,. Fig. 62. indeed, two systems in vogue, to which the names American andEnglish have been given. In the former the railway head followsthe card, and after it are used two sets of drawing frames, , twomachines identical in construction and working, performing exactl} thesamci process. In the latter, three sets of drawing frames are used with (86) DRAWING 87 on railway heads. The modern railway head is practically a drawingframe with a certain characteristic device. It will be described after thetheory and principles of the drawing, as well as a description of thedrawing frame, have been given. If the carding machine works properly, it should produce a sliverfairly free from neps, dirt, and all foreign matter, and with comparativelyfew short fibres remaining therein. The fibres themselves are not perfectlyparallel. In fact, to one examining the web coming from a doffer, theywill appear not to approximate that condition very nearly. They certainlyare not tangled and matted,
Size: 1782px × 1402px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorwinchest, bookcentury1900, bookdecade1900, bookyear1902
