Improvements in Brakes for Let-off Motions in Looms for Weaving Textile Fabrics.
Year: 1893

page_text: Date of Application, 16th Dec., 1893-Accepted, 20th Jan., 1894
COMIDELE
DIMITIVATION.
Improvements in Brakes for Let-off Motions in Looms for Weaving
Textile Fabrics.
JOHN THOMAS BUTTERWORTH, Waterhead, Oldham, in the County of
Lancashire, Mill Manager, JAMES BUTTERWORTH, Wall Hill Mills, Dobcross,
Saddleworth, in the County of Yorkshire, Woollen Manufacturer, ISAAC
BUTTERWORTH, Field House, Dobcross, Saddleworth, in the County of
Yorkshire, Mill Manager, 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:—
The object of our invention is to dispense with the brake-strap, that is now
generally used in connection with the let-off motion of looms, and in its place
provide a more efficient mechanism. The brake-straps now invariably used, we
have found to be more or less unreliable, and often a source of trouble and loss.
In some cases, it has a tendency to slip too easily, and in others will hold the brake
wheel too tightly, thus causing the loom to weave either too heavy or too light.
It is also often affected by changes of temperature, and is also affected by having
too much or too little oil on, any of these drawbacks causing more or less irregularity
in weaving.
Figure 1. is a plan view, and Figure 2. is a side elevation of our invention.
In carrying out our improvements, we do not confine ourselves to a loom of any
particular pattern or design. We make use of the worm-shaft, worm, worm-wheel,
and ratchet wheel, all of which are well known in connection with let-off
mechanism.
A. is a worm-shaft, upon which is a ratchet wheel B. and upon which we also
mount a wave-wheel C. at a required position, having a number of waves, corre-
sponding to the number of teeth that may be upon the ratchet wheel B. D. is a
part of the loom-rail of a loom, to which a suitable bracket casting d' is bolted
directly under the wave-wheel C., and d is a casting having top and bottom
projections, dd, termed a holder, which is bolted to the bracket casting d', and
is a pressure spindle, having upon its upper end bearings de in which runs a
pulley d. The pressure spindle d slides through holes in the projections ď ďª.
Upon the pressure spindle d' a spiral spring d and a set-hoop d are placed, so that
they are between the projections & d'. The pulley d' is made of such a diameter
and dimensions so as to fit into the waves of the wave-wheel C.
In cases where it is required to change the ratchet wheel B. upon the worm-
shaft A. to one having a larger or a smaller number of teeth, a wave-wheel C. is
also put upon the worm-shaft, having a corresponding number of waves.
The operation of our invention, which is a brake, is as follows:-
When the loom is in motion, and the ratchet wheel B. is moved one tooth, by the
motion of the worm-shaft A, the wave-wheel C. is also moved one wave, and the
pressure of the pulley d upon the wave-wheel C. prevents the latter from moving
more than one wave.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. In looms for weaving textile fabrics, the employment of the wave-wheel C.
unon the worm shaft A a dogo ibad

page_text: 2. In looms for weaving textile fabrics, the employment of the casting d'; the
casting termed a holder; the pressure spindle d; the pulley d; the spiral
spring ; and the set hoop d'; as described."
3. In looms for weaving textile fabrics, the employment of the wave-wheel C on
the worm-shaft A. in combination with the casting d; the casting d²; the pressure
spindle d; the pulley ; the spiral spring d; and the set-hoop
; as described.
4. In looms for weaving textile fabrics, the employment of the wave-wheel C;
the casting d; the casting d; the pressure spindle ; the pulley ; the spiral
spring the set-hoop d; in combination with the worm-shaft A, and the ratchet
wheel B, as described.
Dated this 14th day of December 1893
H. & R. T. LORD,
Agents for Applicants.