Improvements in Jacquard Looms.
Year: 1891

page_text: Date of Application, 29th May, 1891
Complete Specification Left, 29th Feb., 1892-Accepted, 2nd Apr., 1892
PROVISIONAL SPECIFICATION.
Improvements in Jacquard Looms.
1, WILLIAM TOWNEND, of the firm of William Townend and Co., Swinnow
Mills, Bramley in the County of York, Manufacturers, do hereby declare the
nature of this invention to be as follows:-
This invention relates to improvements in power weaving looms in which jacquard
shedding mechanism is employed.
In this class of loom particularly when heavy goods are being woven the operator
is necessarily put to considerable exertion when stopping the loom to bring it to
rest in an advantageous position for restarting, and even then it is also necessary
for the operator to materially assist the start or otherwise sufficient momentum is
not imparted to the shuttle to complete the first pick The object of this invention
is to adapt the loom to readily stop when required in a position favourable to
restarting and also to assist the loom by mechanical means to open the shed on
restarting.
For this purpose I employ a spring lever or weighted lever in connection with
the operating lever (or levers in the case of double lift jacquard mechanism) of the
jacquard arranged in such a manner that at the commencement of the "lift" or
opening of the shed the force of said weight or spring has only a limited or slight
action upon the operating lever of the jacquard tending to operate it in the manner
required to open the shed but as the shed opens the action of the spring or weight
increases until its maximum power is applied approximately when the shed is fully
open, and thus by assisting at the lift relieving the loom mechanism.
By this arrangement power adapted to materially assist opening the shed is
stored in the spring or weight at a previous portion of the revolution of the crank
shaft to that in which the shed opens and further from the time when the pick is
made and the weft beaten up. Consequently when the loom is stopped it is
brought to rest in such a position that on restarting it has more time to acquire
sufficient momentum to throw the shuttle besides being greatly assisted in opening
the shed. So that comparatively no assistance is required by the operator at
stopping or starting, the principal strain on the loom is equalised by extending it
over a longer period, friction and vibration are reduced and better results generally
obtained.
Dated this 20th day of Nov 1901
DRACUP & NOWELL,
Bradford, Agents.
COMPLETE SPECIFICATION.
Improvements in Jacquard Looms.
1. WILLIAM TOWNEND, of the firm of William Townend and Co., Swinnow
Mills, Bramley in the County of York, Manufacturers, 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 improvement in power weaving looms in which Jacquard
shedding mechanism is employed.
In this class of loom particularly when heavy goods are being woven the
operative is necessarily put to considerable exertion when stopping the loom to
bring it to rest in an advantageous position for restarting, and even then it is also
Price 8d l
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page_text: '
necessary for the operative to materially assist the start or otherwise sufficient
momentum is not imparted to the shuttle to complete the first pick. The object of
this invention is to adapt the loom to readily stop when required in a position
favourable to restarting and also to assist the loom by mechanical means to open
the shed on restarting.
For this purpose I employ a spring lever or weighted lever in connection with
the operating lever (or levers in the case of double lift jacquard mechanism) of
the jacquard arranged in such a manner that at the commencement of the "lift"
or opening of the shed the force of said weight or spring has only a limited or
slight action upon the operating lever of the jacquard tending to move it in the
manner required to open the shed but as the shed opens the action of the spring or
weight increases until its maximum power is applied approximately when the shed
is fully open, and thus by assisting at the lift relieving the loom mechanism.
By this arrangement power adapted to materially assist opening the shed is
stored in the spring or weight at a previous portion of the revolution of the crank
shaft to that in which the shed opens and further from the time. when the pick is
made and the weft beaten up. Consequently when the loom is stopped it is
brought to rest in such a position that on restarting it has more time to acquire
sufficient momentum to throw the shuttle besides being greatly assisted in opening
the shed. So that comparatively no assistance is required by the operator at
stopping or starting, the principal strain on the loom is equalized by extending
it over a longer period, friction and vibration are reduced, considerably less driving
power is required and better results generally obtained.
To fully describe my invention reference is made to the accompanying sheet of
drawings forming a part of this Specification, in which similar letters of reference
indicate corresponding parts in each of the figures...
Figure 1, is a front elevation of such parts of a loom as are necessary to illustrate
the application of my improvements thereto.
Figure 2, is an end view of the same with certain old parts shown in Figure 1,
omitted so as to more clearly show my additions.
Figure 3 is a plan view of the same and
Figures 4 and 5 are views of details on a larger scale hereinafter referred to..
The letters A, A designate the end frames of the loom, B the top cross rail,
C the bottom shaft, D the double crank disc mounted thereon, E E the draw rods
operated thereby and F, F the jacquard levers actuating the jacquard mechanism
in the ordinary manner and all of the usual construction.
The levers a and a' have their fulcra on the pin b carried between the limbs,
of the bracket d secured to the end of the top rail C. The other ends of the
levers a and a¹ are connected to the jacquard levers F and F by the roils e, e.
The levers a and a' each have a projection i to which the straps are hooked as
shown in Figure 4, which represents two views of the lever a shown separate.
And the other end of the straps g are connected to the spiral springs j, j coupled
together by the strap h passing round the pulley m mounted upon the stud n
secured to the cross rail B.
It will be readily understood that the levers a and a rise and fall with the
outer ends of the levers F and Fand that the action of the springs which are
under considerable tension tends to pull, the outer ends of the levers F and F
down but that this action is very slight when the levers are in the position of a
and F but rapidly increase as they pass the position of a¹ and F.
Provision is made for the adjustment of the length of the rods e, e at their
junction with the couplings o connecting them with the leversa, a'. A screw thread
is formed on the end of the rods and the adjustment is effected by the nuts r, r,
as shown on a larger scale in Figure 5 which represents two different views of the
coupling.
In the case of single lift Jacquard looms only one spring and lever is used so
that the strap and pulley m are not required and that end of the spring is secured
to any convenient part of the frame. And it is obvious that the springs in the

page_text: arrangement shown may be secured in a similar manner but I am of opinion that
the strap h and pulley m cause a smoother motion.
It is also obvious that weights may be used instead of the springs but I do not
find them as convenient.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what mauner the same is to be performed, I declare what I claim is:
1. In a double lift Jacquard loom, the use of spring or weighted levers arranged
substantially as herein shown and described and for the purpose specified.
2. In a single lift Jacquard loom, the use of a spring or weighted lever arranged
substantially as herein shown and described and for the purpose specified.
3. In a Jacquard loom, the general construction and arrangement of additional
parts herein shown and described as and for the purpose specified.
Dated this 27th day of February 1892.
DRACUP & NOWELL,
Bradford, Agents.