IMPROVEMENTS IN LETTING-OFF MOTIONS OF LOOMS follows:-
Year: 1884

page_text: I THOMAS HARGREAVES BRIGG, of Thornton Road, Bradford in the county of
York, Engineer and Machine Maker do hereby declare the nature of the said
invention for "IMPROVEMENTS IN LETTING-OFF MOTIONS OF LOOMS
follows:-
"
to be as
My invention relates to improvements in apparatus for delivering the warps, at
any required tension, and the present improvements have for object to assist the
letting off motions, which are generally actuated by a worm and worm-wheel, and
which when working alone with woollen looms or broad looms produce many
imperfections in the cloth in the process of weaving in consequence of the jerking
and unsteadiness of the warp beam; and when weaving heavy goods the beam
heads, and shafts or axles are frequently wrenched off by reason of the ordinary let
off motion being only applied at one end of the beam the axle of which is of great
length; further when weaving light goods, the worm is often jerked out of its
proper position in the wheel on account of the wheel requiring so little weight,
which causes unevenly woven pieces to be produced.
By applying at the end of the beam opposite to the worm the hereinafter
described modification of the apparatus for which Letters Patent were granted to
me No. 1064 dated the eighteenth day of March one thousand eight hundred and
seventy eight such imperfections are entirely obviated in both light and heavy
goods.
For this purpose I fix on the side opposite the worm wheel, and on the shaft or
end of the beam a pulley or drum, on which work curved brackets of similar con-
struction to the brackets described in the specification of my patent before
mentioned In the bottom part of these curved brackets is secured a stud, on
which works a hanging down lever, made with a jaw at the top end and the hook
of which is passed into a loop on a rod secured in the top portion of the bracket.
The bottom part of the hanging lever has a fork which is connected to a hori-
zontal balance lever having a sliding balance weight; the end connected to the jaw
of the hanging down lever is made projecting and to the end are fixed a short
chain and rod, the other end of which is also connected to a chain, and the chain
(or rope) is secured to a pulley. At the other side of this pulley is a hanging
down balance lever, so that when it is required to release the warp beam for the
pulling back of the piece, the weighted lever is thrown forward thereby releasing
the chain.

page_text: Directly the "pulling back" has taken place, the balance lever is thrown again
into gear, and the weaving operation can be resumed. It is to be understood that
my arrangement as herein described does not interfere with a method previously in
use in which a worm and worm wheel are employed.
I do not confine myself to the employment of the warp beam motion described,
as I may employ ropes, chains, or straps working on any suitably shaped pulleys,
or drums fitted on the shaft and at the opposite end to the worm wheel, and the
said ropes, chains or straps may be fitted with springs or weights.
Dated the thirteenth day of March 1884.

page_text: I THOMAS HARGREAVES BRIGG of Thornton Road, Bradford in the county of
York, Engineer and Machine Maker do hereby declare the nature of the said
invention for " IMPROVEMENTS IN LETTING-OFF MOTIONS OF LOOMS" and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement :—
My invention relates to improvements in apparatus for delivering the warps at
any required tension and the present improvements have for object to assist the
letting off motions which are generally actuated by a worm and worm wheel and
which when working alone with woollen looms or broad looms produce many
imperfections in the cloth in the process of weaving in consequence of the jerking
and unsteadiness of the warp beam, and when weaving heavy goods the beam
heads and shafts or axles are frequently wrenched off by reason of the ordinary let
off motion being only applied at one end of the beam the axle of which is of great
length; further when weaving light goods the worm is often jerked out of its
proper position in the wheel on account of the wheel requiring so little weight,
which causes unevenly woven pieces to be produced.
By applying at the end of the beam opposite to the worm the hereinafter
described modification of the apparatus for which Letters Patent were granted to
me N° 1064 dated the eighteenth day of March one thousand eight hundred and
seventy eight such imperfections are entirely obviated in both light and heavy
goods.
"
For this purpose I fix on the side opposite the worm wheel and on the shaft or
end of the beain a pulley or drum on which work curved brackets of similar con-
struction to the brackets described in the specification of my patent before referred
to. In the bottom part of these curved brackets is secured a stud on which works
a hanging down lever made with a jaw at the top end and the hook of which is
passed into a loop on a rod secured in the top portion of the bracket. The bottom
part of the hanging lever has a fork which is connected to a horizontal balance
lover having a sliding balance weight. The end connected to the jaw of the
hanging down lever is made projecting and to the end are fixed a short chain and a
rod the other end of which is also connected to a chain which is passed over and
secured to a pulley. At the other side of this pulley is a hanging down balance
lever so that when it is required to release the warp beam for the "pulling back"
of the piece the weighted lever is thrown forward thereby releasing the chain.
Directly the pulling back has taken place the balance lever is thrown again into
gear and the weaving operation can be resumed.
It is to be understood that my arrangement as herein described does not interfere
with a method previously in use in which a worm and worm wheel are employed.
I do not confine myself to the exact details of the warp beam motion as described
as I may employ ropes, chains or straps, working on any suitably shaped pulleys
or drums fitted on the shaft of the warp beam, and at the opposite end to the worm
wheel and the said ropes, chains or straps may be actuated by springs or weights.
In order to enable my invention to be fully understood I will proceed to describe
the same by reference to the accompanying drawing in which figure 1 represents a
side clevation partly in section and figure 2, represents a back elevation also partly
in section. Similar letters refer to similar parts in both the figures.
The warp beam is shewn at A, and upon the shaft B, of the warp beam is keyed
the drun or pulley D. Upon this pulley press the shoes or bearing surfaces T,
which are fitted into recesses in the jaw E,. This jaw is supported from the frame

page_text: of the loom upon the stud F, and has at its upper extremity a hook which is
inserted into a recess made to receive it in the cap R. At the other extremity of
the cap R is a hole through which passes a rod S; the said rod is screwed at its
upper part and has a nut screwed upon it which bearing upon the upper surface of
the cap R, is thereby supported. Near the bottom of the jaw E, is a stud by
which the upper joint of the hanging lever G, is supported and upon which it
works and the projecting hook H, catches in a loop at the lower extremity of the
hanging rod S. At the other end of the hanging lever G, is a joint J, in which is
suspended by a pin the L lever K. M, the longer and horizontal arm of which
carries a sliding weight L and the shorter arm M is connected by a rod and
chain N, to the pulley O, over which a portion of the chain passes. The balanced
lever P is fixed upon the same shaft as the pulley O and actuates this shaft. The
weighted lever has a catch at the end opposite to the weight and when in
position holds down the balanced lever P. When the lever Q, is pulled forward
the catch is disengaged, the lever P, rises allowing a portion of chain to run out
over the pulley O, at the same time the balance weight L, falls, the hook H, is
slightly raised thereby slackening the grip of the cap R, and the jaw E, and the
warp beam can be then easily moved round for any required purpose. When the
lever P, is once more pressed down and held in its place by the catch upon the end
of the lever Q the grip of the jaw E and the cap R, upon the drum D which is
fixed to the warp beain shaft is tightened and thereby the warp beam is held
perfectly steady and at any required tension according to the extent of adjustment
so that jerking and uneven strains are avoided.
The tension upon the warp may be regulated by the nut upon the screwed end
of the rod S or by moving the balance weight L upon the lever K.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
Attaching a drum or pulley to the warp beam shaft of looms for weaving, at the
opposite end to that upon which the worin wheel is fixed and gripping such drum
or pulley in a jaw and cap actuated by a weighted lever or a lever actuated by a
spring under control of the operator in the manner described and explained by
reference to the drawing.
Dated the 15th day of December 1884.