Jute and linen weaving by Woodhouse Thomas 1862-1933 & Milne Thomas

Author:Woodhouse, Thomas, 1862-1933 & Milne, Thomas
Language: eng
Format: epub
Tags: Linen, Weaving, Jute fiber
Publisher: London, Macmillan and co., limited

and retain them in this fixed position while the harness is being tied. This box, or frame, requires to be levelled very accurately across as well as along its entire length, and is usually made of stiff, hard wood (in wide widths preferably of wrought-iron bars), and is for the time being roped to the centre cross rail of the loom, to prevent yielding when tying up. The level of this box, or rather of the mails it contains, has to be very carefully determined, and is in many instances arrived at by means of a gauge which is found by experience to suit a given type of loom. This is cut to indicate the distance from the level of the breast beam to the upper side of the top cross pins. A more general way is to fix the frame so that the centres of the mails are half the depth of the shed plus J to f in. below the level of the breast beam. Thus, assuming the lift of the harness to be 3^ ins., the centre of the mails would be 1| + | = 2J ins. below the level of the breast beam. This does not always suit, however, since the position and the bevel of the lay relative to the level of the breast beam vary in different looms, and a better general guide might be to have the centre of the mail about J in. under the line of the race of the lay continued backwards when the lay is full back. This extra depth allows for the slight contraction of the harness when the mails are released from the frame, and for the tendency which the lifted portion of the shed has to raise slightly the portion left down. Since the amount of contraction depends almost entirely upon the degree of tension imparted to the harness by the tier or mounter, it is practically impossible to give an absolutely correctrule. Previous to tying up it is, of course, necessary to attach a sufficient number of tail cords to the hooks of the machine, the number to each depending entirely upon the particular mounting. Thus, suppose a 600's jacquard

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