Improvements in Weft Stop Mechanism for Looms.
Year: 1894

page_text: Date of Application, 10th Mar., 1894
Complete Specification Left, 7th Dec., 1894-Accepted, 12th Jan., 1895
PROVISIONAL SPECIFICATION.
Improvements in Weft Stop Mechanism for Looms.
I, ROBERT BROWN, of Kilwuddie House, Strathaven, in the County of
Lanark, North Britain, Manufacturer, do hereby declare the nature of this
invention to be as follows, that is to say :-
.
My said invention has for its object to construct or arrange weft stop mechanism
in an improved manner and so as whilst suitable for looms in which two or more
shuttles are employed to be capable of operating when failure of weft occurs near
the selvedge at which the shuttle leaves the shed.
In some existing looms in which two or more shuttles are employed stop
mechanism is applied at the middle of the reed and is also used in carrying out
my invention; but I, in addition, arrange mechanism near but within each
selvedge so as to act if failure of the weft takes place after the shuttle has passed
the middle of the shed. When the shuttle passes from, right to left the middle
and left-hand mechanism acts, and when the shuttle passes from left to right,
the middle and right-hand mechanism acts. The middle mechanism comprises
a pair of feelers or wires fixed in a small bellcrank centered in a bracket
fixed to the front of the lathe; and the bellcrank is moved by a slide guided in
the bracket and acted on by a rod extending down to a guide which is at the
bottom of the lathe and is fixed in such a position that the vibration of the
lathe makes the slide move up and down. As the lathe moves back for a weft
shot, the slide rising turns the bellcrank so as to raise the feelers for the
shuttle to pass under them. As soon as the shuttle has passed the feelers
descend and if not held up by the weft they descend and the bellcrank turns
down so far that a hook on one arm of the bellcrank engages with a hole in the
slide and holds the slide up in a position in which a projection on the slide
will strike the ordinary knocking-off device at the next beat up of the lathe. If
the weft is present all right, the slide descends so that its projection is not in a
position to act on the knocking-off device. A spring is applied to the bellcrank
to make it turn down quickly.
The mechanism at each side is to some extent like that at the middle, but
parts are added to modify the timing of the actions, because the feelers must not
descend so soon as at the middle, the shuttle being further and later on its course
before passing them. In each case an additional slide is provided and is fitted to
slide on a bar jointed to a fixed point at the bottom of the lathe, the parts
partaking of the vibrating motion of the lathe. The added slide has at its front
a perforated projection through which the rod of the other slide passes this rod
having on it an adjustable stop which prevents the rod (and consequently the
feelers) descending until the added slide descends. On the back of the added
slide there are two perforated projections through which there extends a rod having
its upper end fixed to the lathe; and this rod has two adjustable stops fixed on it
one above one projection and one below the other. Owing to the vibration of the
lathe and the arrangement of the parts as described, the added slide has a short
movement up and down which movement can, by adjusting the two stops on the
back rod, be made to take place at suitable times for attaining the desired object
of lowering the feelers just as the shuttle is passing beyond thein.
Dated this Ninth day of March 1894.
EDMUND HUNT,
Applicant's Agent. .

page_text: Improvements in Weft Stop Mechanism for Looms.
[, ROBERT BROWN, of Kilwuddie House, Strathaven, in the County of Lanark,
North Britain, 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, that is to say :-
My said invention has for its object to construct or arrange weft stop mechanism
in an improved manner, and so as whilst suitable for looms in which two or more
shuttles are employed, to be capable of operating when failure of weft occurs near
the selvedge at which the shuttle leaves the shed.
In some existing looms in which two or more shuttles are employed, and in
which single shots are or may be made with each shuttle in succession, stop
mechanism is applied at the middle of the reed, and may also be used in carrying
out my invertion but in addition to or instead thereof, I arrange mechanism at
each selvedge so as to act if failure of the weft takes place after the shuttle has
passed the middle of the shed. When the shuttle passes from right to left the
middle and left-hand mechanism acts, and when the shuttle passes from left to
right the middle and right-hand mechanism acts.
Figure, 1, on an accompanying sheet of explanatory drawings is a vertical
section showing a loom lathe in its innermost position, and other parts. Figure, 2,
is a sectional plan of some parts; and Figure, 3, is a front elevation corresponding
to part of Figure, 1, and showing the weft stop mechanism as applied at the middle
of the reed.
In these drawings the same reference letters and numerals are used to mark the
same or like parts wherever they are repeated.
The mechanism comprises a pair of feelers or wires, A, fixed in a small
bellcrank, B, centered in a bracket or plate, C, fixed to the front of the lathe, D;
and the bellcrank is moved upwards by a slide, E, guided in the bracket and
acted on by a rod, F, extending down to a bracket, G, which is upon a guide bar, H,
movable upon a pin adjustably fixed in a stationary frame bracket, J. in such a
position that the vibration of the lathe makes the slide, E, move up and down.
the case of the stop mechanism at the middle of the reed the bracket, G, may be
fixed to the bar, H; I however prefer to apply additional parts hereinafter
described and allowing of accurate adjustment for timing at the middle as well as
at the sides.
In
As the lathe, D, moves back for a weft shot the slide, E, rising, turns the bell-
crank, B, so as to raise the feelers, A, for the shuttle to pass under them. As
soon as the shuttle has passed the feelers, A, descend (the lathe then moving
forward) and if not held up by the weft they descend and the bellcrank, B, turns
down so far that a hook on an arm of the bellcrank engages in an opening in the
slide, E, and under a small bar E 1, formed on the slide across the top of the
opening, and holds the slide up in a position in which a projection, E 2, on it will
strike the knocking-off device as the lathe beats up. If the weft is present
all right, the slide, E, descends so far that its projection, E2, gets below the
position for acting on the knocking-off device. A spring, B1, Figure, 3, is
applied to the bellcrank, B, to make it turn down quickly.
The
The mechanism at each side is to some extent like that hitherto in some cases
applied at the middle, but parts are added which allow of modifying the timing
of the actions, because the feelers, A, must not descend so soon as at the middle,
the shuttle having to pass them when it is further and later on its course..
additional parts, which are shown in the drawings and are also applicable to the
weft stop mechanism at the middle comprise a sliding bracket, G, fitted to slide on
a guide bar, H, adjustably jointed to the fixed bracket, J, this bracket, G, having

page_text: fixed to it a blade spring, G 1, which bears on the bar, H, and frictionally prevents
the bracket from dropping by its own weight. The rod, F, passes through a hole
in one projection, G2, formed on the bracket, G, and through holes in other
projections, G3, G4, thereon there passes a rod, K, the upper end of which is
jointed to the lathe, D. On the rod, K, are upper and lower adjustable
When the
stops K1, K2, and on the rod, F, there is an adjustable stop, F 1.
lathe, D, moves back the rod, K, by its lower stop, K 2, moves up the sliding
bracket, G, which acting on the stop, F 1, moves up the rod, F, and slide, E.
On the lathe, D, moving forward the sliding bracket, G, remains in its raised
position until it is acted on by the descent of the upper stop, K 1, on the rod, K,
and this stop, K 1, can be adjusted with great accuracy so as to cause the feelers, A,
to turn down just as the shuttle gets past them. Thus the stop, K 1, will be
higher in the mechanism at the side of the loom than in that at the middle.
Any suitable known knocking-off or loom-stopping device may be combined
with the mechanism herein before described. What is shown in the drawings
comprises a lever, L, which is acted on by the projection, E 2, and which has
extending down from it an arm, L1. The arm, L1, acts on a lever, M1, on a
rocking shaft, M, extending across the front of the loom and having on it similar
levers (M 1) to be acted on by levers (L) arranged to be acted on by weft stop
mechanism at other parts. On the rocking shaft, M, there is a lever, M 2, which
acts on a bellcrank, N, N 2, connected to a rod, N 4, which acts on the clutch or other
mechanism for stopping the loom. A third arm N 3, of the bellcrank has jointed
to it a rod, N 5, extending to the other side of the loom and available for stopping
the loom by hand.
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 :-
The combination of parts forming the improved weft stop mechanism with its
adjustable devices for obtaining the proper timing when the mechanism is arranged
to act at the selvedges or other part substantially as hereinbefore described and as
shown in the accompanying drawings.
Dated this Sixth day of December 1894.
EDMUND HUNT,
Applicant's Agent.