IMPROVEMENTS IN LOOMS FOR WEAVING
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by John Lewis Byrom at the Office of
the Commissioners of Patents on the 26th July 1881.
JOHN LEWIS BYROM, of Delph, in the County of York, Woollen Manufacturer.
"IMPROVEMENTS IN LOOMS FOR WEAVING."
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My improvements consist in arrangements by which I am enabled to weave in
power looms" pieces containing "swivels or picks of weft which only extend
across a portion of the breadth of the fabric, thereby avoiding the waste of weft
which now takes place by the weft having to be floated over the middle portion of
the piece.
For this purpose I employ an extra shuttle box in addition to the ordinary
shuttle boxes at the end of the lath or slay.
The above named extra shuttle box I mount upon guides attached to the hand
rail of the lath or slay, and from this box extends a rod jointed to one end of a
lever turning upon a stud secured to the framework of the loom. The other end
of the lever aforesaid I connect by means of a rod to the lever used for lifting the
shuttle boxes of ordinary "rising box looms," so that the aforesaid extra box may
at certain times be brought into a line with the ordinary boxes so as to receive a
shuttle from either of the ordinary end boxes of the loom. The aforesaid extra
box. I provide with a picking stick which I connect with the ordinary picking
motion at the ends of the loom in such manner that at whichever side of the loom
a pick takes place the picker of the middle box will also "pick" in the same
direction.
The above named extra shuttle box I provide with a picker capable of sliding
upon suitable rods or guides attached to the box, and I connect this picker to the
picking stick above described. When a "swivel" is about. to be woven, the
tappet in ordinary use for raising and lowering the ordinary boxes will have
brought the extra box into position for receiving a shuttle from either of the
ordinary end boxes, the "jacquard" not operating upon the central portion of the
warp will form "sheds" to receive the weft at the edge or edges of the "piece
only, thereby allowing the extra shuttle box to rest upon the warp threads of the
central portion of the piece. Upon a pick taking place from either of the ordinary
shuttle boxes, the shuttle will be received by the extra shuttle box above named,
"

page_text: and upon the next pick from the opposite side of the loom the said shuttle will be
returned to the ordinary end box. In cases where it is desired to weave a
"swivel" at both edges of the piece simultaneously, I cause shuttles to be
alternately thrown from the ordinary boxes at each side of the loom to the extra
box above referred to.
When the weaving of the swivel is completed the above named tappet or cam in
ordinary use for raising and lowering the boxes lifts the extra box above referred
to clear of the warp threads, and the weaving of the piece will then proceed in
the ordinary manner until a swivel thread or threads has to be again woven.
In place of employing the tappet or cam ordinarily used for raising and lifting
the end boxes for also acting upon the "extra" shuttle box, as above described, I
propose to cause the "jacquard motion" to bring parts into action to effect the
raising and lowering of the said extra box.
Instead of mounting the extra shuttle box upon slides, as above described, I
also propose mounting it upon a shaft or stud carried by the hand rail of the lath
or slay, so that it may be turned upward clear of the warp threads when it is not
in use.