A NEW OR IMPROVED LETTING-OFF MOTION FOR LOOMS FOR WEAVING
Year: 1886

page_text: Date of Application, 18th Mar., 1886.
Complete Left, 18th Dec., 1886.
Complete Accepted, 18th Jan., 1887.
We GEORGE HARTLEY and GEORGE HENRY HARTLEY both of Thornhill Cottage
Thornbury near Bradford in the County of York, do hereby declare the nature of our
invention for A NEW OR IMPROVED LETTING-OFF MOTION FOR LOOMS FOR WEAVING to
be as follows:-
This invention relates to novel and useful improvements in the letting-off motion
of looms for weaving and it consists of a positive motion for unwinding the warp off
the warp beam. The said motion is similar in principle to, what is commonly known
as, the posative take-up motion and it is preferably actuated by mechanism connected
with such take-up motion.
To carry out our invention we fit a roller parallel to the warp beam, which roller is
hereinafter called the warp feed roller and it is preferably driven from the feed roller
of the positive take-up motion by means of a chain wheel on the arbor of the said feed
roller connected by a chain to a chain wheel on the arbor of the warp feed roller.
The said warp feed roller may be placed in direct contact with the warp on the warp
beam, or such warp may be passed over or round it after it is unwound off the beani,
and suitable tension and pressure rollers fitted in connection therewith; so that on the
revolution of the said warp feed roller a supply of warp is drawn off the warp beam
equivalent to the surface speed of such roller. The relative size of the feed roller of
the take up motion to the size of the warp feed roller, and the relative size of the
chain wheels on the arbors thereof regulates the amount of warp supplied from off the
beam.
When the warp feed roller is not placed in contact with the warp on the beam a
suitable tension brake is applied to such warp beam.

page_text: A New or Improved Letting-off Motion for Looms for Weaving.
We, GEORGE HARTLEY, and GEORGE HENRY HARTLEY, both of Thornhill Cottage,
Thornbury, near Bradford, in the County of York, do hereby declare the nature of
this invention for A NEW OR IMPROVED LETTING-OFF MOTION FOR LOOMS FOR WEAVING
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 novel and useful improvements in the letting-off motion of
looms for weaving and it consists of an improved motion for drawing the warp off the
beam. The said motion is similar in principle to what is commonly known as the
positive take-up motion, and it is actuated by mechanism connected therewith.
To carry out our invention we fit a roller parallel to the warp beam, which roller is
hereinafter called the warp feed roller. The said roller is driven from the feed roller
of the positive take-up motion by means of a chain wheel on the arbor of the said feed
roller connected by a chain to a chain wheel on the arbor of the warp feed roller. The
warp is passed over or round the said warp feed roller, and a press roller is connected
therewith arranged to nip the warp and enable the warp feed roller when in motion
to draw the warp from off the warp beam and pass it into the weaving mechanism.
The relative size of the feed roller of the take-up motion and the size of the warp
feed roller, together with the relative size of the chain wheels on the arbors thereof
regulates the amount of warp drawn off. The said warp feed roller and the press
roller connected therewith are preferably slightly fluted, but plain rollers may be
employed or rollers covered with any suitable material.
A suitable tension brake is applied to the warp beam to keep the warp between the
warp beam and the warp feed roller at the requisite tension.
Reference is to be had to the accompanying drawing forming a part of this
specification in which similar letters of reference indicate corresponding parts in both
the figures.
Figure 1 represents an end elevation of such parts of a loom as are necessary to
illustrate the application of our invention. Figure 2 is a back view of the same.
Over the warp beam A a warp feed roller B is fitted upon which the press roller C
rests, the pressure between such rollers is regulated by means of the rods D hooked
over the arbor of the roller C and adjusted by the nuts E. A chain wheel F is secured
on the arbor G of the roller B connected by the chain H to the chain wheel J on the
arbor K of the feed roller of the positive take-up motion. The small pulleys L are
mounted on studs secured to the loom frame, and guide the said chain clear of the
going part.
The warp M passes from the warp beam between the rollers B and C, and when the
loom is in operation the chain H and chain wheels F and J communicate motion from
the arbor K of the feed roller of the positive take-up motion to the rollers B and C,
thereby uniformly drawing the warp off the beam A and feeding it into the weaving
mechanism of the loom.
To maintain the warp at the requisite tension between the warp beam A and the
warp feed roller B the brake levers N are employed. The said brake levers are

page_text: pivotted at Q to the loom frame and bear upon the ends of the beam A with the
pressure exerted by the spiral springs P, stretching between the ends of such levers
and the brackets R secured to the loom frame.
In order to enable the rollers B and C to be independently rotated the chain wheel
F is secured to the arbor G by the set screws S, thus permitting such rollers to be
rotated by the hand wheel T, keyed on the arbor G of the feed roller B, when the said
set screw is unscrewed.
In broad looms or when it is requisite to have the warp extremely tight it may be
necessary to prevent the feed and press rollers B and C from springing by employing
additional rollers to support the middle of the feed roller B, and bear upon the roller C.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed we declare what we claim is:
1. The combination and arrangement of mechanism for delivering or letting-off
the warp, consisting of warp feed and press rollers driven by chain gearing connected
with the positive take-up motion, substantially as herein shown and described.
2. The combination with the said letting-off motion, of the tension brake applied
to the warp beam, substantially as herein shown and described.