Improvements connected with the Warp Let-off Motion of Looms for Weaving.
Year: 1896

page_text: Date of Application, 23rd Nov., 1896
1007
PROVISIONAL SPECIFICATION.
Improvements connected with the Warp Let-off Motion of Looms for
Weaving.
I, EDWARD HOLLINGWORTH, of the Firm of Hutchinson, Hollingworth and
Company, Limited, of Dobcross, in the County of York, Machine Makers do
hereby declare the nature of this invention to be as follows:-
This invention relates to the let-off mechanism of looms for weaving, my
invention being designed to regulate and control the letting-off of the warp
according to the tension or strain put upon it.
In carrying out my invention I fix on the end of the warp beam an ordinary
form of worm wheel gearing with a worm on a sleeve mounted upon a vertical
shaft. This sleeve also carries a broad toothed wheel, gearing with a crown wheel
attached to the let-off motion shaft. At the bottom of the worm sleeve I mount
a weighted hinged lever which by another lever and rods is connected to a shield
which controls the letting-off ratchet wheel. If, therefore, the tension on the
warp is great, the wheel on the warp beam forces the sleeved worm down on its
shaft, and this downward motion acts upon the weighted lever, which, through
the intervention of lever and rods, causes the shield to expose more or fewer teeth
to the action of catches or pawls, which permits more or less warp to be let off the
beam. I wish it, however, to be clearly understood that the tightness or slackness
of the warp, through the medium of the worm and wheel and weighted lever,
controls the movement of the shield covering the teeth of the ratchet wheel, and
further that there is always a direct and continuous communication between the
warp beam and the catches or pawls which let off the warp.
Although I have described the warp let-off motion as employing a worm in a
vertical position I may arrange the worm to occupy a horizontal position, and still
carry a broad toothed wheel, but, in this case, instead of employing a crown wheel
an ordinary spur wheel may be employed.
By means of my present invention, the usual back swing bearer common to
this class of looms is dispensed with...
Dated this 21st day of November 1896.
TASKER & CROSSLEY,
Halifax, Patent Agents.
COMPLETE SPECIFICATION.
Improvements connected with the Warp Let-off Motion of Looms for
Weaving.
I, EDWARD HOLLINGWORTII, of the Firm of Hutchinson, Hollingworth and
Company, Limited, of Dobcross, in the County of York, Machine Makers, do

page_text: bereby 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 the let-off mechanism of looms for weaving, my
invention being designed to regulate and control the letting off of the warp
according to the tension or strain put upon it.
In order to illustrate my improvements I have annexed the accompanying sheets
of drawings illustrative thereof, wherein Fig. 1 is sectional end elevation of the
back portion of a Hollingworth and Kucwles loom having my improvements
shewn thereon, and Fig. 2 is a back view of the same. A represents a portion
of the loom framework and B the warp beam from which the warp is let off as
it is taken up by the weaving. On one end of the said warp beam, I fix a worm
wheel C in gear with a worm D fixed by a key upon the horizontal shaft E which
is free to move endwise in its bearings or the said worm may work upon a sleeve
as will be well understood by those conversant in mechanical motions. On one
end of the shaft E there is a broad spur wheel F gearing with a pinion wheel G
fixed upon the worm shaft H which is in connection with the ordinary and well
known let-off mechanism not shewn in the drawings. At the opposite end of the
shaft E is a' flange I bearing against one or two bowls J carried by a bracket K
fixed upon a shaft L.
On the same shaft L is mounted a weighted lever M; the weight on which is
not shewn.
Underneath these several parts, is a lever N mounted upon fulcrum which
said lever by means of rod P is connected to the usual quadrant lever in connec-
tion with a shield which covers up, or otherwise, the teeth of a letting off ratchet
wheel operated by pawls clearly described and shewn in Prior Letters Patent
granted to me No. 3945 of 1894. This shield and pawls and ratchet wheel are
common to this loom, the object of the said shield being to expose more or fewer
teeth to the action of the pawl so that more or less teeth can be taken up for per-
mitting the warp to be unwound off the warp beam. Through the weighted
lever M is a screw Q the bottom of which rests upon the toe of the lever N the
pressure at which the said screw hears upon the toe being regulated by the hand
wheel R for the purpose of adjustment.
If therefore the tension of the warp is greater than the prescribed requirement
the worm wheel C forces the worm D in the direction of the arrow, (Fig. 1) con-
sequently the butt end I of the worm shaft acts against the bowl J causing the
bracket K to slightly rock the shaft L in doing which, the weighted lever M is
slightly raised. and thus. lessens the pressure of screw Q upon the toe of the
lever N whereby the said lever, through the medium of rod P, will operate a
shield and expose a tooth or two more of the taking up ratchet wheel allowing
the pawls to let off more warp. When the warp has reached its proper tension
the action of these parts is reversed, the shield. returning to its normal position
and covering more teeth whereby the tension of the warp is adjusted.
drawing just described illustrates the worm D in a horizontal position, but in
Fig. 3 the worm is represented in a vertical position and in this case a crown
wheel S is in gear with the wheel F, the said crown wheel being fastened upon the
shaft H. In this drawing the letting off ratchet wheel is shewn at T and the
taking up pawls are shewn at U. but these form no part of my present inven-
tacu having been already shewn and described in the previous Patent No. 3945
of 1894.
The
I wish it to be understood that the tightness or slackness of warp through the
medium of the worm D wheel C and weighted lever M controls the movement
of the shield covering the teeth of the ratchet wheel T, and further that there is
always a direct and continuous communication between the warp beam and the
catches which let off the warp.

page_text: By means of my present invention the usual back swing bearer common to this
class of loom is now dispensed with.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what I
claim is:-
In a warp let off motion of looms for weaving, the employment of wheel C and
a laterally movable worm D which by means of a weighted lever M control the
tension of the warp. all employed and operated in the manner substantially as
herein shewn and described.-
Deted thio 20th day of August 1897
TASKER & CROSSLEY,
Huddersfield, Patent Agents for the Applicant.