Year: 1897

page_text: I, JOHN POYSER, of Wirksworth, near Derby, in the County of Derby, Engineer,
do hereby declare the nature of this invention to be as follows:-
My invention relates to a stop motion for weaving looms designed to operate
upon the breaking of a warp thread, and it comprises the improvements hereinafter
described.
66
According to my invention I advantageously secure that for some portion of their
length the warps shall be free from up and down motion under the influence of
the heddles I suspend from each warp (advantageously in the above mentioned
portion of their length) what I term a dropper," the several "droppers" being
arranged to slide in suitable guides in a frame which I term the "dropper frame."
This frame is at one end pivoted in the frame of the loom and normally hangs in
a vertical position so as to permit of any one of the droppers moving down therein
by gravity, or under the influence of springs, in case of breakage of the warp on
which it is suspended, the other end of the said frame being free to be oscillated
and being connected by suitable means with the stop mechanism of the loom
(which may be of the kind described in my Specification No. 144 of 1895) in
such a manner that, when the said dropper frame is oscillated in the required
direction, the stop mechanism of the loom will be operated.
"
Adjacent to the dropper frame I pivot what I term a "knocking-off hammer'
designed to be continuously and rapidly vibrated from any suitable part of the
loom and preferably from the driving or driven pulley. This oscillating knocking-
off hammer is arranged in such relation to the dropper frame that, in its
oscillation, its free or operating end moves to and fro below the droppers in such
a way that in case any one of the droppers falls in the dropper frame owing to
the breaking of the warp thread supporting it, the said dropper will fall in the
path of oscillation of the oscillating knocking-off hammer which will then impinge
against the edge of the said dropper and so oscillate the dropper frame and stop
the loom.
The extent to which the droppers descend in the dropper frame is advantageously
limited by a bar extending through slots in the said droppers and carried by a
lever or levers in such a manner that the movement of the said lever or levers
serves or serve for returning the droppers to their normal position after the loom
has been stopped and the warp joined.
In order that the hooks upon the droppers when the droppers are raised by the
lever for return to engagement with the warps shall engage with the warps auto-
matically, I advantageously form the upper end of each hook with a V-notch
the bottom or point of which is connected by a slit with the eye through which
the warp thread normally runs or I may shape the upper end of the dropper with
a half arrow head lying at right angles to the warp.
With the first of these arrangements when a dropper is lifted so that the upper
end thereof comes into contact with the warp, the latter is guided by the inclined

page_text: sides of the V-notch into the slit and thence is directed under the hook, and with
the second the point of the half arrow head passing the warp the barb is brought
into contact with and displaces it laterally until the half arrow head has passed
when the warp returns to its position and the lever being released the barb
catches upon the warp and so suspends the dropper therefrom.
Improvements in Warp Stop-motions for Weaving Looms.
I, JOHN POYSER, of Wirksworth, near Derby, in the County of Derby, Engineer,
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 stop motions for weaving looms designed to operate
upon the breaking of a warp thread and to that class of stop motion wherein a
series of droppers is adapted to hang from the warps and to slide in a pivoted
or suspended frame (which is herein referred to as the dropper frame) connected
with the striking mechanism and having working in proximity to it an oscillating
knocking-off hammer or bar arranged in such relation to the dropper frame that
when one of the droppers falls or slides down therein owing to the breakage of
the warp supporting it the said oscillating lever moves the dropper frame and
operates the striking mechanism.
The object of my invention is to simplify the construction of such mechanism
and to provide means whereby after the breakage of a warp thread and the
operation of the mechanism the parts may be again put in operative position more
readily than heretofore.
According to my invention I make the hooks by means of which the droppers
are suspended from the warp threads of special construction and I pass the warp
threads through guides so that the lifting of the droppers shall cause the automatic
engagement of the dropper hooks with their respective warp threads.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawings, in which:-
-
Figure 1 is a side elevation of so much of a loom as is necessary to illustrate the
application of my improved warp stop-motion thereto; and,
Figure 1 is a view of some of the parts shown in Figure 1 in a different position:
Figure 2 is a sectional elevation looking in the direction of the arrow Figure 1:
Figures 3 and 4 are respectively a face view and an edge view of one of the
droppers drawn to a larger scale than Figures 1 and 2; and,
Figures 5 and 6 are respectively an end elevation and a sectional side view
of the dropper frame.
a is the frame of the mechanism, which may be an independent frame as shewn
in the drawings or part of the general framework of the loom, and b, bare two
bars or rollers carried in the said frame and across which pass the warp threads
in their passage from the let-off rollers c, c¹ to the vibrating roller or back
bearer which oscillates under the operation of the shedding motion of the loom
in a well known manner, the said bars 6, 61 serving for ensuring that the portions
of the warps between the said bars shall always remain in a horizontal position.
e, el are two combs which serve for ensuring that the warp threads shall always

page_text: maintain a uniform distance apart and for supporting the said threads against
lateral pressure as hereinafter described.
f. f are the droppers one of which is suspended from each warp at a point between
the two bars b, b' each of the said droppers as shewn in Figures 3 and 4 being in the
form of a flat plate having a hook fi at its upper end and is the dropper frame,
shewn detached in Figures 5 and 6, which is pivoted to the main frame at g¹
and at its free end connected by a rod g² or by any other suitable means to the
striking mechanism of the loom (which may be of the kind described in the
Specification of my former Patent No. 144 of 1895). This dropper frame which
normally hangs vertically as shewn has arranged in it a number of guide bars h, h
between which the droppers are free to slide when the warp threads suspending
them break. ' is a fixed guide for the upper part of the droppers.
is the knocking-off hammer designed to be continuously and rapidly vibrated
from any suitable part of the loom; this oscillating knocking-off hammer is arranged
in such relation to the dropper frame that in its oscillation its free end moves
to-and-fro beneath the droppers without coming in contact with them; in case,
however, any one of the droppers falls in the dropper frame owing to the breaking
of the warp thread supporting it the said dropper will fall into the path of oscilla-
tion of the knocking-off hammer which will then impinge against the edge of the
said dropper and so oscillate the dropper frame to stop the loom.
As shewn in the drawing this knocking-off hammer is pivoted upon centres j, j
in a frame which is fixed in position immediately below the frame a. The
frame also carries a shaft one end of which has fixed to it a pulley through
the medium of which, and a belt, motion may be communicated to the shaft 7
whilst the other end of the said shaft has upon it a crank pin which projects into
a slot m in an extension arm m' of the knocking off hammer. With this arrange-
ment it will be understood that as the pulley rotates the knocking-off hammer
will be caused to oscillate.
The extent to which the droppers descend in the dropper frame is limited by a
bar o extending through recesses o in the said droppers and carried by levers 02, 03
pivoted to the frame a. This bar o is prolonged at one side of the loom to form a
handle whereby when any dropper has fallen it may be raised by lifting the said
bar to the extent allowed by the said recesses o¹.
In order to allow of the droppers being packed as closely as possible side by
side and also to allow any dropper to fall freely without its barb or hook fouling
the adjacent droppers I attach the barbs to the droppers at one side instead of in
the centre, and on the other side at a corresponding distance from the centre I pro-
vide a slot p, as clearly shown in Figure 3. I attach the barb to one side of half
the number of droppers and at the other side to the remaining half, and I arrange
the droppers alternately so that each barb has on each side of it the slot in the
adjacent dropper.
The hooks have each the form of a half arrow head the position of the barb
relatively with the warp thread with which it is to be engaged being such that
as the dropper is raised by the bar o the said barb will force the warp thread
laterally, the guides e, e¹ ensuring that the warp threads shall not be permanently
displaced, whereby when the barb has passed above the warp the latter will assume
a position beneath the said barb and so support the dropper.
The operation of the apparatus hereinbefore described is as follows:-Upon the
breaking of a warp thread the dropper suspended therefrom falls by its own weight
(or if necessary under the action of a spring) until it is arrested by the upper
edge of the recess o coming into contact with the bar 0, that is
to say, until the dropper occupies the position indicated in Figure 1.
This down ward movement of the dropper brings the lower end of
the same into the path of the oscillating hammer i so that during the next forward
movement of the hammer the latter causes the dropper frame to swing, also as shewn
in Figure 1 and operate the knocking off mechanism. After the broken warp has

page_text: been repaired the handle extension of the bar o is raised by the operative until the
hook is lifted above the warp, when the handle is again lowered leaving the
dropper suspended from the warp as before.
The arrangement hereinbefore described is particularly adapted for narrow
ware looms of the kind described in the Specifications of former Patents Nos. 15431
of 1893 and 144 of 1895, but it is to be understood that my invention can also
be applied to looms for weaving wide fabrics.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:-
1. In a stop motion for looms wherein a dropper is suspended from each warp
and has its lower end adapted to slide in a movable frame connected with the
striking mechanism and, on falling, to project into the path of a continuously
oscillating lever or bar so as to cause the movement of the said frame forming
the droppers with barbed hooks which when the said droppers are lifted so that the
hooks pass above the warp threads automatically engage with the said threads,
the portions of the threads with which the hooks engage being carried horizontally
through guides which ensure that the pressure of the hooks against the threads
when passing them shall not permanently displace them relatively with the said
hooks, substantially as described.
2. In a warp stop-motion for weaving looms, droppers adapted to hang from
the warps by means of hooks, such hooks being so shaped that on their being
raised above the warps and again lowered they automatically engage with the
warp threads and remain suspended therefrom, substantially as described.
3. In a warp stop-motion for weaving looms wherein a series of droppers are
arranged to fall in a dropper frame, recesses formed in the said droppers and a rod
extending through the said recesses and arranged to arrest the fall of the droppers
and to raise them from their lower to their upper position, substantially as
described.
4. Knocking-off mechanism for weaving looms consisting of the parts constructed
and combined substantially in the manner hereinbefore described and illustrated in
the accompanying drawings and operating as, and for the purposes set forth.
DL
1
T
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.