IMPROVEMENTS IN FABRICS PRODUCED IN TWIST LACE MACHINES."
Year: 1879

page_text: PROVISIONAL SPECIFICATION left by Robert Scott at the Office of the
Commissioners of Patents on the 18th August 1879.
ROBERT SCOTT, of 63, Waterloo Promenade, Nottingham. is IMPROVEMENTS IN
FABRICS PRODUCED IN TWIST LACE MACHINES."
At the present time muslin like fabrics are now commonly produced in twist
lace machines, and open work or holes are produced in the midst of the muslin,
such holes having around them a thickened and raised rim or margin as if sewn
over by a needle. Such worked holes as heretofore produced in twist lace machines
have however the disadvantage that at the ends of the holes the appearance of
sewing over is very imperfect. To remedy this defect is the object of this
Invention.
The Invention is illustrated by the diagram hereunto annexed, and by the table
showing the respective position of the warp threads at each forward and backward
movement of the wefting bobbins.
The warp threads are divided into sets. In the example shewn they are divided
into sets of seven with a separate weft bobbin working with each set, and between
the sets is an interclosing warp thread which catches alternately the bobbin weft
threads of the two adjacent sets.
Also in the example shewn by the diagram, when a hole is to be formed it
commences on the central line between two sets and on this line two interlacing
threads are used working as one thread whilst the plain muslin like work is being
produced, but when the hole is commenced they are led in opposite directions one
to one side of the hole and the other to the other side of the hole, and the bobbin
thread working with the set of warp threads on either one or other side of the
central line is caused to twist around this thread and also around each of the warp
threads of the set in succession, commencing with the one nearest to the central
line and passing on to the next, and so on in succession, thus there is a twist or it
might be twists of the bobbin thread around the lacing thread between where one
warp thread is caught in and where the next warp thread is taken. Or in place of
the warp threads being taken in in succession one by one they might be taken in
pairs or in other subdivision of the set, and the twists of weft thread and
binding thread be between pairs or other subdivision of the set of warp threads.
The diagram 1 shows how one end of a hole may be formed in the manner above
described

page_text: The end A of the diagram shows plain muslin like work being produced, the end
B shows the formation of the hole.
Diagram 2 shows on a larger scale a portion of the edging around the hole formed
by, one set of the warp threads.
The table shows the movements of, the various warp threads of this set at each
backward and forward movement of the weft bobbins.
The numbers at the head of this table denote the various warp threads as marked
on diagrams 1 and 2, the other numbers denote the gaits to which the various warp
threads are moved.
Threads 31, 32, are the lacing threads between two sets of; warp threads on the
central line at which a hole is to commence. The bobbin weft thread is shewn by
the thick lines. It will be seen that the lacing thread 32 passes under the bobbin
thread, then over, and at the same time 28 goes over with it; 32 and 28 then pass
under the bobbin thread and afterwards over at the same time that 24 goes over
with them.
32, 28, and 24 next pass under the bobbin thread and then over with 20, and so
on in succession.
It will thus be seen that in the edge formed around the hole there is a coil or
twist, or it might be coils or twists, of the bobbin weft thread around the lacing
thread, in between where one warp is caught by the weft thread and where the
warp next to it is caught, and that the warp threads are tied in in succession by
the weft thread, beginning with the one nearest to the centre.
Whereas, heretofore, in forming the edge around a hole all the warp threads of a
set passed together under and over the bobbin thread.
And, consequently, at the ends of the holes the appearance of sewing over was
extremely imperfect.