Improvements relating to the Let-off Motion of Looms.
Year: 1891

page_text: Date of Application, 21st Dec., 1891
Complete Specification Left, 21st Sept., 1892-Accepted, 22nd Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements relating to the Let-off Motion of Looms.
We FRANCIS TOMLINSON of No. 31 Burton Street, Blackburn, Drawer-in,
and GEORGE HIGSON of No. 3 Hope Terrace, Blackburn aforesaid, Cotton
Manufacturer do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the "weighting" or
letting off"
motion of looms for weaving, the object being to apply the weight to the neck, or
ruffle of the warp beam in such a manner that very much lighter, or less weights
are necessary at the same time greater efficiency is ensured and less complicated
mechanism employed to achieve the required "weighting" of the warp beam the
apparatus consisting of an arrangement of compound levers which greatly increase
the practical utility of a weight, or weights applied thereto.
According to this our said invention we employ a lever free to rock on a centre
or fulcrum stud fixed in the end frame of the loom and through this lever we form
a vertical longitudinal slot for the passage of a rod or bar of metal, the lower end
of which can be moved and adjusted in the slot by means of a pin, and holes or
grooves and the upper end forms a hook for engaging with a link of the weighting
chain or with the weighting rope which as ordinary passes around the neck or ruffle
of the beam. Bolted preferably to the back rail of the loom is an adjustable
bracket which carries an elongated stud the end of which forms a fulcrum for a
second lever mounted above, and resting at a short distance from its fulcrum on a
projection on the first mentioned lever.
The second mentioned lever carries the weight or weights which tend to depress
the lever, and also the first mentioned lever on which it rests, and the arrangement
of the levers whereby the weight or power has so great a leverage against the
resistance, and the fact of employing the two levers, greatly increases the efficiency
of the weight or weights and thus less weight is required to effect the desired
object.
Dated the 16th day of December 1891
WALTER BRIERLEY,
Bank Chambers, Waterhouse Street, Halifax, Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements relating to the Let-off Motion of Looms.
We FRANCIS TOMLINSON of No. 31 Burton Street, Blackburn Drawer-in
and GEORGE HIGSON of No. 3 Hope Terrace, Blackburn, aforesaid Cotton
Manufacturer, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
"
This invention relates to improvements in the "weighting or "letting off"
motion of looms for weaving the object being to apply the weight to the neck or
ruffle of the warp beam in such a manner that very much lighter, or less, weights
are necessary at the same time greater efficiency is ensured, and less complicated
mechanism employed to achieve the required "weighting" of the warp beam, the
apparatus consisting of an arrangement of compound levers which greatly increase
the practical utility of a weight, or weights applied thereto.
According to this our said invention we employ a lever free to move on a fulcrum
stud, and through this lever is formed a longitudinal slot for receiving a rod, or bar
of metal to the upper end of which the ordinary weighting rope or chain is

page_text: attached. Bolted to the back rail of the loom is a bracket which carries a stud on
which a second lever is mounted, and this lever rests on a projection on the first
mentioned lever. The second mentioned lever carries the weight or weights for
weighting the beam.
Such being the nature and object of our said invention the following is a com-
plete description of same reference being had to the accompanying drawings in
which:-
Fig. 1 is a back or end elevation of part of a loom having improved "let off
motion applied to the warp beam.
Fig. 2 is a plan view of the compound levers.
"
According to this our said invention we employ a lever 1 free to rock on a
centre, or fulcrum stud 2 fixed to the end frame of the loom, and through such
lever we form a vertical longitudinal slot 3 (see Fig. 2) for the passage of a rod
or bar 4 of metal. The lower end of the rod or bar 4 can be moved, and adjusted
in the slot 3, and held in the desired position by means of the pin 5 which is placed
in one of the holes 6 in the rod or bar 4, and in one of the recesses 7 in the lever 1.
The upper end of the rod or bar 4 forms a hook, or eye 8, and to this hook or eye 8
the "weighting" rope or chain 9 is attached either directly, or through the inter-
vention of the link 10.
Bolted to the back rail 11 of the loom is an adjustable bracket 12 which
carries an elongated stud 13 the end of which forms a fulcrum for a second lever 14
mounted above the free end of, and resting on a projection 15 on the first lever 1.
The second mentioned lever 14 carries the weight or weights 16 which tend to,
depress this lever and also the lever 1 on which the lever 14 rests.
It will be seen that the lever 1 is in contact with the lever 14 near to the
fulcrum of the latter so that the weight 16 and lever 14 exercise great power or
leverage on the lever 1 so the fact of employing the two levers in the manner
described greatly increases the efficiency of the weight or weights 16 and thus less
weighting is required to effect the desired object.
One end of the weighting rope or chain 9 is fixed at 17 to the back rail 11 of
the loom and after passing two, three, or more turns round the ruffle or neck 18 of
the warp beam is attached to the link 10 or hook or eye 8 as described.
"
The weighting motion" is applied to each end of the warp beam.
Having now particularly described and ascertained the nature and object of our
said invention, and in what manner the same is to be performed, we declare that
what we claim is :-
1. The arrangement and combination of the parts comprising the lever 1,
lever 14, rod or bar 4 and rope or chain 9 as and for the purpose herein described
and as illustrated by the drawings annexed.
Dated this 20th day of Senten ben 1902
TOMLINSON,
FRANCIS
GEORGE HIGSON,
By their Agent, Walter Brierley,
Penny Bank Chambers, Halifax.
FRANCIS TOMLINSON,
GEORGE HIGSON,
By their Agent, Walter Brierley,
Penny Bank Chambers, Halifax.