IMPROVEMENTS IN LOOMS FOR WEAVING
Year: 1876

page_text: LETTERS PATENT to James Denby Lee and James Crabtree, of Windhill, near
Leeds, in the County of York, Machine Makers, for the Invention of
"IMPROVEMENTS IN LOOMS FOR WEAVING."
Scaled the 5th December 1876, and dated the 8th June 1876.
PROVISIONAL SPECIFICATION left by the said Samuel Denby Lee and
James Crabtree at the Office of the Cominissioners of Patents on the 8th June
1876.
JAMES DENBY LEE and JAMES CRABTREE, of Windhill, near Leeds, in the
County of York, Machine Makers. "IMPROVEMENTS IN LOOMS FOR WEAVING."
This Invention relates to means of operating the healds for opening and closing
the shed at the required time or times when weaving broad cloths.
For this purpose we employ an ordinary jacquard cylinder and peg lags, the
pegs of which when projecting come into contact with a lever having a hook at
each end. One or other of thes hooks come into contact with one or other of
two catch levers working in opposite directions. This hooked lever is hinged on
a bar capable of being moved longitudinally by the catch levers in either direction,
according as to which hook has hold of a catch lever. To this bar are affixed cords,
straps, or chains which pass over pullies running on studs fixed to the top rail of
the Joom, two of which are connected to the top of one of the healds, and one by
means of bell-crank levers to the bottom, so that the heald is raised or lowered
according as to which direction the bar is moved. Each heald requires a separate
movable bar and hooked lever, pegs being arranged in the lags suitably to act on
the levers as required.
For working the cylinder we employ an eccentric loose on the crank shaft driven
in one way only by a tumbler catch-box so that the cylinder can only be turned
when the loom is running in the forward direction.
For keeping the treading lever in contact with the tappet we employ a lever and
weight instead of the spiral spring heretofore used.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said James Denby Lee and James Crabtree in the Great Seal Patent
Office on the 8th December 1876.
JAMES DENBY LEE and JAMES CRABTREE, of Windhill, near Leeds, in the
County of York, Machine Makers. "IMPROVEMENTS IN LOOMS FOR WEAVING."
This Invention relates to means of operating the healds for opening and closing
the shed at the required time or times when weaving. The healds are attached
by cord or wire to the arms of a series of bell-crank levers or jack rods somewhat
in the usual manner.
The ends of these levers to which the healds are attached
are caused to oscillate or rise and fall at the proper time by the movement of
horizontal slide rods or bars, to which the other ends or arms of the top series
of bell-crank levers are attached by pins working in slots in the said levers.
A series of levers worked by cam, eccentric, or other equivalent from the crank
shaft impart a constant lateral reciprocatory motion to two bars or rods in opposite
directions. Levers having a catch at each end are hinged to the horizontal slide
rods before mentioned, and by means of peg legs these lovers are caused to
engage with one or other of the lateral slide rods so that the heald is raised or
lowered according as to which direction the bar is moved.
In order that our Invention may be more fully understood we herein give refer-
ence to the accompanying Sheets of Drawings marked with figures and letters of
reference.
Fig. 1 is a general front view of our apparatus, and such parts of a loom as are
necessary to illustrate the application of the same. Figs. 2 and 3 are details.
In the accompanying Drawings A represents the healds, each of which is attached
through the medium of bell-crank levers and cords a to one of a series of slide
rods B. These rods are arranged side by side, being separated by pins b. The bell-
crank levers are also connected together bycords or wires c so as to keep the
lealds in a constant state of tension. To each of the slide rods is hinged a lever C
having a catch dat each end, and at every revolution of the crank shaft one or
other of these catches engages with one of the two sliding bars D, E, which have
a constant lateral reciprocatory motion in opposite directions in slots or slides F
in the framework. This oscillatory motion is produced by means of cams or
eccentrics G on the crank shaft, which by raising and lowering the rod H imparts
through the series of levers and rods J the necessary reciprocatory motion to the
sliding bars D and E.
When it is desired to raise the healds the catch lever engages with the sliding
bar D (the said catch lever being heaviest at that end), and as the bar D recipro-
cates the heald is raised and lowered again to the centre line at each revolution
of the crank shaft. When it is desired to change or lower the heald a pine on
the lags supports the inclined lever K hinged at g, and the point p of the catchi
lever mounting the incline K the lever C is lifted out of contact with the bar D
and immediately engages with the bar E. When changing back to the first posi-
tion a stationary finger or bar / prevents the catch lever from tilting back before
reaching the termination of the stroke or during the change of the "peg lags."
The "peg lag" cylinder is caused to revolve by means of a pin in a rod L attached
to the slide rod E (see Fig. 3), taking into a star wheel on the end of the
peg lag" cylinder.
"
The projecting fingers P of the reciprocatory bar B are employed for the purpose
of determining the exact position or length of stroke of the sliding bars D and E
so that either end of the lever C may always be enabled to catch on the bar
indicated by the "peg lags."
Having thus described the nature of our Invention, and shewn by Drawings
how the same is to be performed, we would have it understood that we do not
confine ourselves to the precise details of construction or arrangement as the same
may be varied, but what we claim as our Invention and consider to be new is-

page_text: Firstly. The employment in conjunction with each heald of a slide bar or rod B
and bell-crank levers connected together by cords or wires, as herein shewn and
described.
Secondly. The employment in connection with each of the sliding bars B of a
double catch lever C, arranged as and for the purpose herein shewn and described.
Thirdly. The use of the finger h, as and for the purpose herein shewn and described.
In witness whereof, I, the said James Denby Lec, for and on behalf of
myself and the said James Crabtree, have hereunto set my hand and seal,
this Sixth day of December, in the year of our Lord One thousand eight
hundred and seventy-six.
Witness,
A. B. CROSSLEY,
Clerk to Wm. Tasker,
Patent Agent,
Halifax.
JAMES DENBY LEE. (L.S.)