Improvements in or relating to the Lathe-motion of Power-looms.
Year: 1896

page_text: Date of Application, 15th May, 1896-Accepted, 20th June, 1896
COMPLETE SPECIFICATION.
Improvements in or relating to the Lathe-motion of Power-looms.
1, GEORG SCHWABE of Biala, in the Empire of Austria, 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 lathe-motion of power looms is usually obtained in such a manner that the
crank 1 (Fig. 3) of the crank-shaft is connected with the lever 3 by a short link 2,
unless eccentric wheels are used for stopping the loom during the course of the
shuttle, the said lever 3 having its fulcrum 4 ou the side wall of the loom and
transmitting the movement to the lathe-band 5 connected at the fulcrum 6 with the
lathe 7. The lathe itself is suspended in an oscillating manner or it is supported
in the fulcrum 9 by the foot 8 of the lathe. For looms, by which webs of greater
width are manufactured the motion at both sides of the loom is not sufficient and
cannot be applied in the interior of the loom because, owing to the fulcrum 4, it
can possibly be applied only on the side walls and moreover the lever 3 and the
lathe-band 5 would be placed in the space of the mounting passing through.
Even the best propping of the lay-beam cannot prevent that, on passing in the-
thread of the weft, it will be deflected. The pivots of the fulcrums, in particular
of that fixed on the side wall (4), are worn out by this to such an extent that after
a short time the motion of the lathe will be an oscillatory and vacillant one.
To avoid these inconveniences, lever 3 (Fig. 3) with its pivot 4 fixed to the side.
wall of the loom and the lathe-band are dispensed with and the new arrangement
is rendered completely independent from the side wall, so that it may be applied
also in the interior of the loom without impeding the mounting passing through.
In order to guide the lathe in a uniform manner, the crank-shaft is provided
according to the width of the loom, with two, three or more cranks taking up the
pressure of the lathe in a uniform manner.
Fig. 1 (Sheet I) and Fig. 7 (Sheet 11) are side-views of the device, while
Figs. 2, 4, 5 show the several positions thereof. Fig. 6 and Fig. 8 are longitudinal
views of the device. The cranks b 61 62 (for a triple guiding of the lathe) of the
crank-shaft a are connected by the short links c c c2 with the pivots d d d 2
respectively, the latter forming at the same time the point of application of the
arm of the bent levers e e¹ e 2 respectively. These bent levers e e' e 2 are fulcrummed
in the same middle line at fff2 respectively while there is secured to their other
arm 9 9' 92 respectively the lay-beam h. Figs. 7 and 9 show the shape of the
bent-lever e in the interior of the loom, wherein the mounting extending through
may work without any obstacle. The bent lever e ele 2 is pivotted here at f on the
link i of the two loom traverses k and supported by a piece m so that the latter
takes up the pressure of the lathe when the thread of the weft is passed in. The
quantity of the stroke of the cranks b b 62 is determined according to the throw of
the lay-beam h and according to the proportion of the length of the two arms of
the bent levers e e e 2. The device works in the following manner. The revolving
crank shaft a transmits by its cranks b b b 2 the movement to the short links c c c 2
whereby a to-and-fro motion is imparted to the pivots d d d 2 in a not uniform
manner (with stopping). As these pivots form at the same time the end of the
arm of the bent lever e e e 2, they transmit these oscillations directly to the lay
beam secured to the other arm g g g 2 and produce thus the lathe motion.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is ;-
The arrangement of the lathe motion on power looms wherein the lathe motion
is obtained by the transmission of the revolving movement of a crank shaft a
provided with two three or more cranks bb'62 by short links c c c 2 to two three or
more bent levers e e e 2 fulcrummed in the same middle line at ff1f2 respectively
in such manner that a to-and-fro motion is imparted to the lay-beam h secured to
the other arm g glg 2 of the bent levers e ele 2 substantially as described and shown
in the accompanying drawings.
Dated this 15th day of May 1896.
BOULT & WADE,
Agents for the Applicant.