Apparatus to Prevent the Drawing in of the Threads of the Selvage in Textile Fabrics by the Tension of the Weft.
Year: 1894

page_text: Date of Application, 26th July, 1894-Accepted, 1st Sept. 1894
Apparatus to Prevent the Drawing in of the Threads of the Selvage
in Textile Fabrics by the Tension of the Weft.
I, MAGNUS SCHWARTZ, of 79 Forstgaten, Lodra, Malmö, Sweden, Foreman,
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 threads of the selvage of textile fabrics have hitherto been more or less.
drawn in according to change in the tension of the cross threads during the
weaving, and in consequence the fabric is made uneven at the edge, sometimes, a
little to narrow sometimes a little to wide.
The object of my invention is the construction of an apparatus whereby the
influence of the cross tension on the selvage is completely prevented, therefore the
edge produced is quite straight.
In order that my invention may be the better understood I now proceed to
describe the same, reference being had to the accompanying drawings and to the
letters and figures marked thereon.
Above and over the edges of the fabric, a casing a is arranged extending to the
outermost selvage thread. The said casing can be rotated around an axle 6 and it
is bolted at c to a pivotal piece d, hinged to a rod e. The rod e is operated by a
lever on the axis g, and the axis 9 resting over the breast beam is operated by
any suitable part, so as to receive a reciprocating motion, in such a manner that the
casing occupies the position shown in dotted lines when the batten is at the back,
and the other position in full lines when the batten is in the front.
In the casing a is situated a rack o which is movable and which carries at its front,
a pointed projecting arm n, further in connection with o a cog wheel p on the boss
of which is arranged a spiral spring r, the inner end of which is fixed to the boss
and the outer end to the casing at 8; and lastly a cog wheel a fixed to the axis b of
the casing. If the casing a is turned in the direction of x, the cog wheel p engages
with q whereby the cog wheel p and the rack o are operated. This causes the
pointed projecting arm n to spring from the casing a and to be placed beside the
outermost edge thread with the point downwards. When this is done the shuttle
is thrown, and the pull on the thread is caught by the pointed projecting arm n,
thus preventing the drawing in of the selvage threads. The casing a then returns
during the further operation of the machine the rack o and the pointed projecting
arm n returning into the casing. This movement is effected by the spiral spring r.
In order to prevent injury to the edge threads by the pointed projecting arm
coming too close to the latter, the following mechanism is designed; which ensures
that the arm n descends a little distance away from the edge threads and lays itself
beside the latter after its descent.
The axle is situated with its inward end in a slot c¹ and is kept in this position
by the spring k attached at t. The end of the axle rests on the lever h pivotted at u
and is pushed upwards in the slot at the suitable moment by the lever h, through
a rod m which is connected to f, and by the lever / which is pivotted at v. In this
manner the casing a is placed in an oblique position, so that the pointed projecting
arm n descends a distance from the edge threads.
In the next moment the lever h trips off from the lever l, the end of the axle b
descends under the influence of the spring k, the casing a returns into its proper
position and the pointed projecting arm n lays itself against the edge thread.

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 1 declare that what I
claim is.
1st. An apparatus to prevent the drawing in of the selvage threads in textile
fabrics by the weft threads, consisting of a pointed projecting arm n which is
adapted to automatically descend (shortly before the carrying in of the weft
thread) and forms a rigid support in a definite position for the edge of the
material in order to take the pull of the weft thread substantially as described.
2nd. An apparatus constructed substantially as described and shown in the
accompanying drawing for the purpose specified.
Dated this 26th day of July 1894.
FELL & WILDING,
1, Queen Victoria Street, London, E.C., Agents for the Applicant.