Elastic and non-elastic narrow fabrics : $b and a chapter on narrow fabrics made on knitting machinesBrown, Samuel
History
Elastic and non-elastic narrow fabrics : $b and a chapter on narrow fabrics made on knitting machines
Brown, Samuel
Elastic fabrics; Looms; Rubber industry and trade; Textile fabrics; Weaving
[Illustration: Fig. 5.—Combination Warp and Shuttle Figure Produced on
Overshot Dobby.]
[Illustration: Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10]
It is customary in some factories to use only one harness to carry both
rubber and gut, inasmuch as the weaving of the two are the same and they
both go in the same cavity or pocket of the web. Where such a method is
employed there is always a tendency for the gut threads to get out of
their proper places, and to fall together in pairs at irregular points,
which will produce an objectionable “rowey” appearance in the goods. This
will be noticed more particularly in white and light colored webs.
[Illustration: Fig. 6A.—Harness Draft and Weave for Three-Quarter Inch
Loom Web]
[Illustration: Fig. 7A.—Harness Draft and Weave for One-Half Inch Lisle
Web]
[Illustration: Fig. 8A.—Harness Draft and Weave for Three-Quarter Inch
French Web]
[Illustration: Fig. 9A.—Harness Draft and Weave for Three-Quarter Inch
Cable Web]
In the harness draft shown, it will be seen that one harness is employed
for the rubber and one for the gut. It is thus possible to shed the gut
harness so as to open more than the rubber, having it travel both higher
and lower than the rubber harness at each alternate pick of the loom. By
this movement the gut threads will be kept in the desired position, and
at the same relative side of the rubber threads in each of the several
pockets designed to carry them both. If, from any unusual cause, any of
the gut threads get away from their proper places it is easy by this
arrangement of separation to lift the gut harness at any time, insert
a thread of cotton between the gut and rubber threads, and put them in
their proper places when commencing to weave again.
The weave employed in the making of webs of this kind, although of a very
simple character, involves a condition which does not favor a straight
well woven fabric unless great care is taken to offset troublesome
tendencies. The nature of the weave is such that at one pick the binder
harness changes, while on the next pick it remains open and does not
change, the rubber and gut harness changing only. The result of this
movement is such that one shed clears for the reception of the filling
much better than the other, so that at one side of the web the filling
will hug the edge wire, shown at W in Fig. 6A, while at the other side of
the web the failure to get a good clearance prevents the filling getting
so snugly around the wire. Therefore, as the web draws away from the edge
wire in the process of weaving, the tendency is for one selvage rubber
cavity to be small, while the other is large, which means that at the
open side there is a freedom for contraction of the edge rubber which is
not present at the other side, and a long-sided uneven web is the result.
MAKING A GOOD SELVAGE
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