Improvements in or relating to the Under-motions of Looms for Weaving.
Year: 1894

page_text: COMPLETE SPECIFICATION.
Improvements in or relating to the Under-motions of Looms for
Weaving.
We, SALO BRAUN and MAX SCHWEITZER, both of 10 Hainestrasse Gera, in
the Empire of Germany, Weavers, 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 a new spring tension or operating device for the heddles
of looms by means of which very much weaker springs can be employed for drawing
down the raised heddles, while the power required to raise them is considerably
less than heretofore, although the depression of the heddles is still effected with
the requisite force. The saving in power during the rise of the heddles produces
a saving in the power required to work the loom and consequently less strain on
those parts which raise the heddles, and also on the leashes and warp threads
because the weaving gear is much less strained. Furthermore the consequent
smaller strain on the leashes allows of an easier insertion of the warp threads.
In the accompanying drawing which illustrates our invention:-
Figure 1 is a view in front elevation of the spring operating device.
Figure 2 is a view in side elevation thereof, and
Figure 3 is a diagram showing the action on a heddle.
Throughout the views similar parts are marked with like letters of reference.
The device consists of a frame a on the upper parts a¹ and a of which the
heddles rest. In the lower part of, the frame a is mounted a shaft b on which the
eccentrics c¹, c³, c³, etc. are mounted so as to rotate freely thereon. The number
of these eccentrics corresponds to the number of the heddles. Each heddle has
fastened to it at its lower end a cord which terminates in a belt e¹ which passes
round an eccentric c¹ and is fixed thereto at the point a¹. The other end of the
belt is connected to a spring f¹ which is connected at its other end to the top of the
frame a.
The eccentrics c¹ etc. are mounted with their longest radius alternately
right and left so that the springs can be arranged alternately right and left as if
they are all arranged on the same side, they would be liable to interfere with one
another. Heretofore the springs have been mounted directly on the lower heddle
bars, and therefore the power ✗ for raising a heddle was of necessity equal to
the spring power F. __ Now according to my invention, F is determined according
to the equation F (Figure 3) and įsince n is greater than m, F is smaller
than X.
=
Xm
n
In raising a heddle, the eccentric rotates, consequently ✗ acts gradually with
an increasing leverage, and F with a decreasing leverage. In drawing down the
heddle the reverse takes place, therefore less power required to raise the heddles
than when the springs are mounted directly on the heddles. Notwithstanding this,
the heddles are drawn down with sufficient force and certainty.
We wish it to be particularly understood that we do not limit ourselves to the
precise details of construction hereinbefore described and illustrated by the accom-
panying drawing, but that we hold ourselves at liberty to make such changes and
alterations as fairly fall within the spirit and scope of our invention.

page_text: 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. The improvements in and relating to looms substantially as hereinhefore
described and illustrated by the accompanying drawing.
2. In a loom, a spring tension or operating device for the heddles in which
springs are connected by cords to eccentrics which in their turn are connected to
the heddles, for the purpose of effecting a saving in power when the heddles are.
being raised, and of aiding the descent of the heddles when the said heddles are
depressed, as set forth.
Dated this 4th day of July 1894.
ROBERT E. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent.