An Automatic Back Stop Motion for Drawing Frames.
Year: 1888

page_text: Date of Application. 20th Aug., 1888
Complete Specification Left. 20th May, 1889-Accepted, 22nd June, 1889.
PROVISIONAL SPECIFICATION.
An Automatic Back Stop Motion for Drawing Frames.
1, EUGENE NICHOLSON of 3 Apple Terrace, Bolton in the County of Lancaster,
Carder, do hereby declare the nature of my said invention. to be as follows:-
This invention relates to an automatic back stop motion for drawing frames employed
in the preparation of yarn from cotton and other fibrous substances and has for its
object that of preventing the entering of single sliver or snarls caused by being ruffled
in the sliver cans, or from overpressure or other causes. On the back side of the
machine I fix a detecter plate in the path of the travel of the sliver from the card
cans. This detecter plate is provided with slots leading to holes or openings through
which the sliver passes to the ordinary pivoted guides and rollers, and is mounted in
an adjustable manner on a pivoted centre attached to the carrying plate. The detecter
plate is provided with a balance lever and weight for the purpose of adjusting the
same. When perfect sliver is passing through the holes in the detecter plate the
latter leans forward in the direction the sliver is travelling from. Immediately a
ruffled part of sliver or snarl, or in case one of the ends lash into the others, presents
itself to the holes or openings the thick part operates on the detecter plate and pushes
it backwards, by which a lever mounted on its pivoted centre is placed in contact with
the ordinary vibrating finger, which immediately stops the machine and thus prevents
uneven sliver being fed into the drawing rollers, resulting in a more even and better
sliver or roving yarn being obtained than hitherto.
Dated the 18th August 1888.
EDMUND CHADWICK,
Agent.
i
COMPLETE SPECIFICATION.
An Automatic Back Stop Motion for Drawing Frames.
I, EUGENE NICHOLSON of 3 Apple Terrace, Bolton in the County of Lancaster,
Carder, do hereby declare the nature of my said 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 an automatic back stop motion for drawing frames employed
in the preparation of yarn from cotton and other fibrous substances and has for its
object that of preventing the entering of single sliver or snarls caused by being ruffled
On the back side of the
in the sliver cans, or from overpressure or other causes.
machine I fix a detecter plate in the path of the travel of the sliver from the card
cans. This detecter plate is provided with slots leading to holes or openings through
which the sliver passes to the ordinary pivoted guides and rollers, and is mounted in
an adjustable manner on a pivoted centre attached to the carrying plate. The detecter
plate is provided with a balance lever and weight for the purpose of adjusting the same.
When perfect sliver is passing through the holes in the detecter plate the latter leans
forward in the direction the sliver is travelling from. Immediately a ruffled part of
sliver or snarl, or in case one of the ends lash into the others; presents itself to the
holes or openings the thick part operates on the detecter plate and pushes it backwards,
by which a lever mounted on its pivoted centre is placed in contact with the ordinary
vibrating finger, which immediately stops the machine and thus prevents uneven
sliver being fed into the drawing rollers, resulting in a more even and better sliver or
roving yarn being obtained than hitherto.
Fig. 1 is a sectional elevation of so much of a drawing frame as is necessary to
.

page_text: illustrate my present invention, and Fig. 2 is a longitudinal elevation of the back plate
of a drawing frame with my improved detecter plate attached thereto.
To the back plate A are fixed the bearings B carrying the centre C, on which is
mounted the detecter plate D. The detecter plate D is provided with the slots E
leading to the holes or openings G, through which the sliver H passes to the ordinary
pivoted guides or spoons I and draw rollers J. The centre C carrying the detecter
plate D is fitted with the balance lever K and movable weight for the purpose of
adjusting or balancing the detecter plate D. The centre C is also provided with the
lever N having the hook or curved projection N'. O is the ordinary vibrating or
oscillating rod mounted in the levers or arms P on the rocking shaft R. The latter is
operated by the lever S and connecting rod T in the usual manner from any convenient
part of the machine.
When perfect sliver is passing through the holes or openings G in the detecter
plate D, the latter leans forward in the direction the sliver is travelling from as shown
in full lines in Fig. 1. When the detecter plate D is in this position the hook end N¹
of the lever N is raised above the path of travel of the upward stroke of the vibrating
or oscillating rod O as shown, by which the machine can be worked as long as perfect
sliver is being fed therein.
Immediately a ruffled part of sliver, or a snarl, or in case one of the ends lash into
the others, or a knot M as in Fig. 1; presents itself to one or more of the holes or
openings G and will not pass through the same, the thick or ruffled part of the sliver
operates on the detecter plate D and pushes the upper end of the same backwards as
shown in dotted lines in Fig. 1. This backward motion of the upper end of the
detecter plate D drops the hook N' of the lever N into the path of the ordinary
vibrating or oscillating rod O as shown in dotted lines in Fig. 1, which immediately
arrests the travel of the latter, and operates the mechanism attached thereto
for stopping the machine, thus preventing uneven sliver being fed into the draw
rollers J.
In another modification the detecter plate D is divided into parts as shown in
longitudinal elevation in Fig. 3, each part containing one hole or opening G and
slot E; the number of the parts or plates being according to the number of ends to
a head or delivery. The parts or plates D are attached to an arm or lever U mounted
on the centre C. Each arm or lever U is provided with a lever N and hook N' as
shown in Fig. 4, by which each part or plate D can operate independently, which is
absolutely necessary when operating on very soft or tender sliver. In this case the
balance lever K and weight L are dispensed with.
In adapting the detecter plate or plates D to drawing frames wherein the vibrating
or oscillating rod O is arrested or stopped when making a downward stroke the lever N
is constructed without the hook or curved projection N¹ as shown in Fig. 5.
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 1
claim is :-
In drawing frames employed in the preparation of yarn from Cotton' and other
fibrous substances the use of the detecter plate or plates D, with the slots E and
openings or holes G, mounted on the centre C, and the lever or levers N for the
purpose of automatically stopping drawing frames to prevent single sliver or snarls
and other analogous imperfections being fed to the draw rollers J, applied and operating
substantially as described and illustrated by the drawings.
1000