CERTAIN IMPROVEMENTS IN LOOMS FOR WEAVING
Year: 1873

page_text: LETTERS PATENT to John Brown, of Bolton, in the County of Lan-
caster, Machine Maker, for the Invention of "CERTAIN IMPROVEMENTS
IN LOOMS FOR WEAVING."
Sealed the 24th June 1873, and dated the 6th May 1873.
PROVISIONAL SPECIFICATION left by the said John Brown at the
Office of the Commissioners of Patents, with his Petition, on the
6th May 1873.
I, JOHN BROWN, of Bolton, in the County of Lancaster, Machine
Maker, do hereby declare the nature of the said Invention for "CERTAIN
IMPROVEMENTS IN LOOMS FOR WEAVING," to be as follows:-
My improvements relate to the shedding motion and consist in an
improved mode of working the double lift shedding motion. I employ
for this purpose two grife levers moving on the same fulcrum stud,
either with two sets of hooks or one set of double hooks, the hooks are
connected below to the cross head of a T piece to which the heddles are
suspended, and all the said T pieces pass through a guide plate, or the

page_text: hooks may be connected to a jack with a double set off, this jack is
connected by toothed segments to another similar jack. The hooks pass
through needles as usual, and these needles are acted upon by jacquard
cards passing around a single cylinder, to bring the selected hooks in
line with the grife levers. The grife levers are made with a bridle to
bring down the hooks that might remain up before a fresh shed is made.
The grife levers are worked up and down by a double lever with two
studs placed at equal distances from the fulcrum and with links from
these studs to the end of the grife levers.
Instead of the T picces above referred to I also propose to unite the
hooks by cords connected to a wire or rod passing through a guide
plate.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Brown in the Great Seal Patent Office on
the 1st November 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, Jonn
BROWN, of Bolton, in the County of Lancaster, Machine Maker, send
grecting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixth day of May, in the year
of our Lord One thousand eight hundred and seventy-three, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said John Brown, Her special
licence that I, the said John Brown, my executors, administrators,
and assigns, or such others as I, the said John Brown, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise,.and
vend; within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "CERTAIN IMPROVE.
MENTS IN LOOMS FOR WEAVING," upon the condition (amongst others) that I,
the said John Brown, my executors or administrators, by an instrument
in writing under my, or their, or one of their hands and seals, should

page_text: particularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and cause the same
to be filed in the Great Seal Patent Office, within six calendar months
next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said John Brown, do hereby declare
the nature of my said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement (that is to say)
My Invention consists in an improved mode of working the double
lift shedding motion. I employ for this purpose two grife levers moving
on the same fulcrum stud, either with two sets of hooks or one set of
double hooks. The hooks are connected below to the cross head of a
T piece to which the heddles are suspended, and all the said T pieces
pass through guide plates; or the hooks may be connected to a jack
with a double set off; this jack is connected by toothed segments to
another similar jack. The hooks pass through needles as usual, and
these needles are acted upon by jacquard cards passing around a single
cylinder to bring the selected hooks in line with the grife levers. The
grife levers are made with a bridle to bring down the hooks that might
remain up before a fresh shed is made. The grife levers are worked
up and down by a double lever with a stud placed on cach side of
the fulcrum, and with links from these studs to the ends of the grife
levers,
Instead of the T pieces above referred to I also propose to unite the
hooks by cords connected to a wire or rod passing through a guide
plate.
And in order that my Invention may be fully understood I will
proceed to describe the accompanying Sheet of Drawings.
Fig. 1 is a side view, and Fig. 2 an end view of my improved double-
lift shedding motion.
a, a, are the frame sides, which are connected by the needle plates b, b,
and by the upper and lower guides plates c and d. The jacquard cylinder e
is moved to and fro from the crank shaft of the loom in the ordinary
manner, and around it pass the jacquard cards which act on the two
sets of needles f, f. These needles are connected, as usual to the
hooks g, g, each set of needles being connected to a set of hooks. The
grife levers h, h, are jointed to the same fulcrum stud h¹, and in the

page_text: outer extremity of each lever is fixed a stud to which the swivel blocks h³
are hinged, and each swivel block is connected by a link i to the opposite.
ends of the double lever , which is caused to vibrate by a crank on the
second motion shaft of the loom. The lower ends of the two sets of
hooks are connected by the cross head of the T. picce j to which the t
heddles are suspended, and all the said T pieces pass through the upper
and lower guide plates c and d. In some cases double hooks may be.
used instead of the single hooks marked g, and in such cases the T pieces
are dispensed with. When the machine is at work the selected hooks
are pushed beyond the reach of the grife levers, so that when the grife
levers rise they lift the hooks that have not been selected, while the
selected ones remain down, the lower ends resting on the upper guide
plate c. Each grife lever is made with a bridle ², the object of which
is to bring down the hooks that might remain up; by this means
each set of hooks is brought to the same level before a fresh shed is
opened.
The T picce j, shown in Figs. 1 and 2, is made with two studs cast or
fixed to it, and the hooks pass freely up or down on each side of the
studs.
Fig. 3 represents an elevation and plan of a T piece constructed
according to a modification of Invention.
my
Fig. 4 is an elevation and plan of another of my improved T picces.
Fig. 5 is an elevation and plan of a T piece with four holes in the
cross head for the hooks to pass through.
Fig. 6 is a detached view of one of my improved hooks which is made
When these long
long enough to pass through the guide plate d.
hooks are used cach heddle is suspended by cords to the two adjacent
hooks.
Fig. 7 is an elevation and Fig. 8 a plan of one of my improved jacks,
the longer arm of which is provided with a double set off, as shewn in
Fig. 3, for the hooks to act upon, and the shorter arm is provided with
a toothed segment gearing into the segment of a corresponding jack;
the heddles are suspended to these jacks in the usual manner.
Having thus stated the nature of my Invention, and described the
manner of performing the same, I declare that I claim,—
First. The general combination and arrangement of the parts forming
the improved double-lift shedding motion, as shewn and described.

page_text: Secondly. Constructing the grife levers with bridles to bring down
the hooks, as shewn and described.
Thirdly. The use and application of T pieces for connecting the hooks
of double-lift shedding motions, as shewn and described.
And lastly. The mode of connecting the hooks of double-lift shedding
motions to the jacks, as shewn and described.
In witness whereof, I, the said John Brown, have hereto set my
hand and seal, this Twenty-ninth day of October One thousand
eight hundred and seventy-three.
TOHN DROWN
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