An Improved Warp-beam Brake.
Year: 1896

page_text: Date of Application, 5th Aug., 1896-Accepted, 13th Feb., 1897
An Improved Warp-beam Brake.
I, ERNST BUSCHMANN, of Marienstrasse, Glauchau, Silesia, in the Empire of
Germany, Merchant, 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 present invention relates to a brake for the warp beam of looms. The customary
devices heretofore employed possess considerable defects, which consist principally in
that the rolling weights used therewith necessitate watching and supervision on the
part of the attendants, whilst the sliding weights also employed are liable to injure the
fabric. On the other hand the improved brake can be generally used with great
advantage, as it keeps the thread always elastically tight at will.
In the accompanying drawing-
Figures 1 and 2 represent the improved warp beam brake.
Figure 3 shows a modification.
The warp beam a carries a toothed wheel b, and round this wheel is laid a chain c
one end of which.is held by a spring d, whilst at the other end a weight e acts to
produce tension. For enabling the tension of the chain to be regulated the weight is
preferably applied to the chain by means of a lever f. The chain has flat links and
its division corresponds to that of the teeth of the brake wheel b. The pins of the
links bear either directly, or through the medium of rollers made of metal, leather or
the like and slid thereon, upon or between the teeth, an elastic part, such as a ring g
of leather or rubber, being if necessary interposed in order to obtain a softer effect.
The teeth of the wheel in their adaptation to the system of loom or the ware under
treatment, are at greater or less distances apart and of greater or less depth, and made
of curved or round shape. This brake acts in such a manner that the toothed wheel b
passes below the chain e, the chain pins or their rollers having the tendency to fall
into the spaces between the teeth, and thus to retard the motion of the wheel 6 and
warp beam a. The consequence is that the brake continually draws back the beam,
this drawing back taking place with such rapidity at the moment when the harness
moves downwards that even a momentary slackening of the thread is rendered
impossible. As the brake can act on both sides of the wheel b it is very effective
and by adjusting the weight e on the lever f any heavy or light motion may be
provided for.
The fixing of the spring end, the supporting of the weighted lever and the
arrangement of the weighted rod depend on the construction of the loom.
The modification shown in Figure 3, differs from the arrangement illustrated in
Figure 1 and 2, in that the pins of the pitch chain c work without rollers with the
wheel b, and there is no elastic ring inserted between the same.
Further in this case the two ends of the chain c are connected to a one-armed
leverf whose pivot or fulcrum is situated under the spring d, whilst the end of the
lever carries the weight e. The operation of the brake is the same in both cases.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
A warp beam brake characterised by a toothed wheel 6 provided upon the warp

page_text: beam a and upon which a chain or links c runs or run with tension produced by a
spring and weight, for the purpose of obtaining an adjustable elastic back pull or
brake action acting continually.
3000
0
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents.