Improvements in and connected with Let-off Motions of Looms for Weaving Ribbons and other Narrow Articles.
Year: 1898

page_text: Date of Application, 11th Oct., 1898-Accepted, 23rd Dec., 1898
Improvements in and connected with Let-off Motions of Looms for
Weaving Ribbons and other Narrow Articles.
I, WALTER LUFT, of Nordstrasse, 11, in the City of Barmen, Germany,
Manufacturer, 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 :-
My invention relates to improvements in looms for making bands ribbons or other
narrow woven articles and it consists in an arrangement by which the warp can be
let off intermittently a more or less long piece as desired.
My invention is more clearly described in the following specification and
illustrated on the accompanying drawing of which
Figure 1 shows the device with the warp bobbin braked,
Figure 2 is a representation showing the brake out of action,
Figure 3 is a detail.
On the shaft a fixed to the backside of the loom is rotatably secured the
bobbin to which is furnished the warp c. The warp is guided over the
rollers d, e, f to the front part of the machine. Between the rollers e, f is
inserted a roller g over which the warp is also guided. This roller is journalled
in a fork to which is screwed a hook i having suspended a weight . The
weight serves as usually to regulate the tension of the warp threads.
Round the bobbin is led a brake band which fits between the flanges m of
the bobbin and is fixed with one end at n. To the other end of the band is
attached a cord o which is passed over rollers p, q and carried downwards close to
the warp where it is guided through an eye r fixed to the fork or pulley block h.
This cord is provided at its free end with a weights and above and below the
eyer to the cord o are affixed knots t, t¹ respectively or an equivalent of the
same as for instance a ring, eye or the like piece.
The working of the device is as follows:
By means of the weights the bobbin is braked in its whole latitude and as
the band fits closely between the flanges m each warp thread is braked and not a
single thread can escape over the flanges m. According to the weaving process the
warp is raised at x till the eye r bears under the knot t of the cord o which thus is
raised and released so that the band disengages the bobbin. The weight k acts
then on the warp c pulling it down and turning the bobbin round. Next the
weight 8 acts on the cord o braking the bobbin and ceasing its motion.
This play is alternately repeated and as it is easy to understand that by arranging
different weights and different distances of the knots t t¹ from the eye r, the bobbin
may be intermittently turned and a more or less long piece of warp may be let off.
In order to limit the downstroke of the warp the knot t¹ is provided, which catches
the eye r the weight acting now together with weight 8 on the cord o so that the
bobbin is directly stopped.
The braking action is always alike whether the bobbin be full or half full, as in
the first case a greater portion of the bobbin is in contact with the band and
accordingly the friction between band and bobbin varies.

page_text: 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
In a loom for weaving bands ribbons or the like narrow woven articles the
arrangement of a brake band for the bobbin fitting closely between the flanges of
the bobbin and having one end fixed, the other end connected to a cord which is
passed over rollers and through an eye of the warp roller carrier said cord being
provided above and below the eye with knots or its equivalents and weighted at its
end for the purpose as described and set forth.
WALTER LUFT.
By A. Daumas.
Agent for Applicant.