230 (#302) ############################################ WOOLLEN AND WORSTED SPINNING will decide the relative positions of the last or outer coils on the bobbin. In (c), for example, if an ascer- tainable number of coils n only be placed on the bobbin the coils will be laid exactly side by side* ; but if N +M coils are placed on the bobbin then overlapping of the coils must occur. In the light of the principles here at issue the speed of the lifter in both drawing and spinning machines should be adjusted. It should also be noted that the finest French roving-box and the best thread- winders placed on the market are designed to so vary the traversing of the roving or thread, running on to the barrel or spool driven at a fixed speed, that the layers of roving or thread are laid side by side from the commencement of building of the ball or spool to the completion. With reference to (3), all that need be remarked is that in all textile processes the textile engineer should be clear as to whether he is or is not getting the result sought for. A habit of “ chancing " things is to be strongly deprecated. The final mode of delivery to be dealt with is that employed in the French drawing-boxes (see Figs. 66 and 66a). In this case the basic idea is to ball the sliver on to a "stave " so that without twist it will draw-off well. The slivers on emerging from the front-rollers are rubbed, and thus consolidated, between one or two pairs of rubbing leathers (similar in construction and action to the rubbers employed on the woollen condenser) and then wound, by surface friction, on to staves run horizontally on drums, at a regular rate, a reasonably firm ball of sliver being thus produced. To facilitate both winding-on and pulling-off it is usual to run two slivers together, any tendency the two slivers may have * It is reasonable to expect an overlooker to work to these con- ditions, as he thereby turns off neat-looking full bobbins. 230
20 20 Textile Machine Part
38 38 Textile Machine Part
58 58 Textile Machine Part
79 79 Textile Machine Part
82 85 Textile Machine
254 254 Textile Machine Part
97 98 Textile Machine
217 218 Textile Machine
349 349 Textile Machine Part
266 267 Textile Machine Part
279 280 Textile Machine