IMPROVEMENTS IN LOOMS FOR WEAVING
Year: 1879

page_text: LETTERS PATENT to Robert Hall, of Bury, in the County of Lancaster, Machine
Maker, and William Nuttall, of Gollingrod, in Walmsley, in the same County, .
Weaver, for the Invention of "IMPROVEMENTS IN LOOMS FOR WEAVING."
Soolad the 0th Jan 1880 and dated the 3rd September 1870
PROVISIONAL SPECIFICATION left by the said Robert Hall and William
Nuttall at the Office of the Commissioners of Patents on the 3rd September
1879.
"
ROBERT HALL, of Bury, in the County of Lancaster, Machine Maker, and
WILLIAM NUTTALL, of Gollingrod, in Walmsley, in the same County, Weaver. 'IM-
PROVEMENTS IN LOOMS FOR WEAVING."
In performing the first part of our Invention we form toothed segments at one
end of the rocking levers which give motion to the treadles that actuate the jacks.
These toothed segments give motion to plate wheels loose on a stud, which wheels
have teeth about three quarters of the way round, and on the plate near the blank
part of the wheel is a small stud, which stud is connected by a link to the treadle
actuating the jacks. Motion is given to the rocking levers in the usual manner by
chains driven from the crank shaft.
When the falling chain lifts the end of the rocking lever it depresses the end
on which the toothed segment is formed and causes the plate wheel to make a
partial revolution, thus raising the treadle and causing a down dwell for any
number of picks according to the pattern. When the rising chain lifts the end of
the lever on which the segment is formed it causes the plate wheel to turn partly
round in the opposite direction, thus drawing down the treadle and causing a dwell
up for any number of picks according to the pattern. By means of our improvements
the healds are worked with little or no jar, and the warps are less liable to break.
The second part of our Invention consists in the application of plain or grooved
segments connected by bent wires to the springs for drawing down the healds after
they have been raised by the jacks, whereby the power requisite for forming the
shed is greatly reduced. We place a grooved segment on a stud near the spiral
spring in such a position that the power required for lifting the healds is reduced
as the shed is being opened, whereas in the ordinary mode of applying springs
the resistance increases as the shed is opened.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Robert Hall and William Nuttall in the Great Seal Patent Office on
the 28th February 1880.
* ROBERT HALL, of Bury, in the County of Lancaster, Machine Maker, and
WILLIAM NUTTALL, of Gollingrod, in Walmsley, in the same County, Weaver.
"IM-
PROVEMENTS IN LOOMS FOR WEAVING."
Our Invention relates, firstly, to the treading motion, and secondly, to the
shedding motion of looms for weaving; and in order that our Invention may be
fully understood we will describe the accompanying Sheet of Drawings, reference
being had to the Figures and letters marked thereon.
Fig. 1 is a side view of part of a loom to which our improved treading motion
is applied. a is the frame; bis the crank; c is the falling chain, and c² the rising
chain; d, d, are the treadles, all of which are made in the usual manner; e, e, are the
rocking levers at one end of which we make toothed segments f, f, which give
motion to the plate wheels g; .h, h, are links connected by studs to the plate wheels
g and to the treadles d, d. When the falling chain c lifts one end of the rocking
lever e it depresses the end of the lever on which is the toothed segment fƒ and¯
causes the plate wheel g to make a partial revolution, thus raising the treadle & and
causing a down dwell for any number of picks according to the pattern. When
the rising chain c' lifts the end of the rocking lever e on which is the toothed
segment it causes the plate wheel g to nove partly round in the opposite
direction, thus drawing down the treadle d and causing a dwell up for any number
of picks according to the pattern. By our improved method of actuating the
treadles they are kept stationary until required for the next change according to
the exigencies of the pattern; and when the treadles are down or up they are
locked in position until moved by the chains.
Fig. 2 is a view of our improved spring shedding motion. i, i¹ are the segments
which work on studs, and arc connected by the bent wires j, j', to the springs k, k¹;
1, are the cords which connect the segments to the bottom of the heald, shafts.
The segment is in the position it occupies when the heald shaft is down, when
the heald shaft is raised by the tappet the segment is drawn up, as shewn at i.
Owing to the arrangement of the segments and springs the resistance decreases as
the shed is opened and the resistance increases as the shed is closed, thus having
the least strain on the healds when the stress is not required, and vice versa.
spring shedding motion shewn can be applied either to the top or the bottom of
the loom.
j
The
Having thus stated the nature of our Invention, and described the manner of
performing the same, we declare that we claim,---
First. The method of cominunicating motion from the working levers e, e, to the
treadles d, d, substantially as shewn and described, and
Secondly. Reducing the strain on the healds while shedding by the combination
of the segment and spring, substantially as shewn and described.
In witness whereof, I, the said Robert Hall, for myself and on behalf of the
said William Nuttall, have hereunto set my hand and seal, this Twenty
seventh day of February, One thousand eight hundred and eighty.
ומתתna