Improvements in Warp Stop Motions for Looms for Weaving.
Year: 1896

page_text: Date of Application, 17th Jan., 1896
Complete Specification Lelt, 19th Oct., 1896-Accepted, 28th Nov., 1896
PROVISIONAL SPECIFICATION.
Improvements in Warp Stop Motions for Looms for Weaving.
I, ALFRED WILKINSON, of 60, Carlisle Road, Bradford, in the County of York,
Watchmaker, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in looms for weaving, and its object is
to provide a simple and efficient stop motion or mechanism for automatically
stopping the loom when one or more of the warp threads break.
For this purpose I employ a rotary brush or the like mounted across the warp and
preferably above it close to the warp-beam or "let-off" roller. The bristles or their
equivalent are continuous along the brush the full width of the warp but they are
preferably not continuous circumferentially but are fixed in one or more strips which
is or are arranged at each revolution to brush the warp and more or less pass through it.
The rotary brush is preferably interinittently driven and when it is stationary the bristles
are preferably free from the warp. The brush is arranged to brush the warp in the
opposite direction to that in which it is fed into the loom therefore in case a warp
thread is broken the broken end is brushed back. A light roller or bar may be
mounted beneath the warp below the brush.
The broken end thus carried back by the brush is laid hold of by or deposited
upon the "dents" or wire of a light roller adjacent to the brush and more or less
covered with wire-card clothing or its equivalent. This roller is made as light as
possible and is very lightly driven in the reverse direction to the brush so that
the drag of the broken end stops or retards it. An arrangement is provided in
connection with the card roller to move it longitudinally immediately it is stopped
or retarded and it is connected to a convenient part of the ordinary weft stop motion
or to the starting lever of the loom or other suitable part in such a manner that
when this longitudinal movement of the card roller takes place the loom is
stopped.
To drive the card roller in this way it is capable of moving longitudinally and
it may be driven by a "snail" or incline on the shaft bearing against an anti-
friction roller mounted on the end face of the card roller. The inclination or
angle of the snail is such that it normally drives the card roller but in case the
latter is checked the motion of the snail moves the card roller longitudinally.
To relieve the strain on the broken end as soon as possible I form ratchet teeth
on the opposite end face of the card roller to that by which it is moved and a
very slight movement of the roller causes these teeth to engage a pawl which
prevents further rotation. This pawl is then moved by the further longitudinal
movement of the roller and this motion of the pawl may be communicated in any
convenient way to the stop mechanism to stop the loom. A light spring is provided
to return the card roller to its normal position as soon as the end of said snail passes
off the said anti-friction roller.
The card roller may be driven by a chain or in any other convenient manner
and the brush may be driven from it by a wheel having the greater portion of its
periphery without teeth.
Dated this 16th day of January 1896.
DRACUP & NOWELL,
Bradford, Patent Agents.

page_text: Improvements in warp Stop Motions for Looms for Weaving.
I, ALFRED WILKINSON, of 60, Carlisle Road, Bradford, in the County of York,
Watchmaker, do hereby declare the nature of this invention and in what manner
the same is to be performed, to he particularly described and ascertained in and by
the following statement:-
This invention relates to improvements in looms for weaving, and its object is to
provide a simple and efficient stop motion or mechanism for automatically stopping
the loom when one or more of the warp threads break.
To fully describe my invention reference is made to the accompanying sheet of
drawings forming a part of this specification, in which similar letters of reference
indicate corresponding parts in each of the figures.
Figure 1, represents an end elevation of such parts of a loom as are necessary to
illustrate the application of my invention.
Figure 2, represents a plan view and Figure 3, a back view of the same.
Figures 4 to 9, represent separate detail views on a larger scale hereinafter
referred to.
The side frames A and A 2, the tappet shaft A3 the crank shaft A4, the warp
beam A, the back beam A 6 and the starting lever A 7 are of any ordinary
construction. And the warp shown by the broken lines W in Figures 1, 6, 7 and 8
passes in the usual manner from the warp beam A 5 over the "back beam" A 6 and
into the loom.
A light roller B covered with "card filleting" or wire card clothing or a
suitable equivalent is mounted over the warp so as just to clear it. This roller is
supported at one end by its journal spindle B2 in a bearing formed in the
bracket C (fixed to the side frame A) through which the journal spindle projects;
and the journal spindle B 3 at the other end fits into a bearing formed in the
centre of the end of the shaft D which shaft D is mounted in bearings formed in
the bracket 2 fixed to the side frame A 2. The shaft D is driven by the toothed
wheel D3 fixed upon its outer end engaging the pinion D4 mounted upon the
stud D 5 and fixed to the sprocket wheel D6 driven by a chain (not shown) from the
sprocket wheel D 7 upon the crank shaft.
A brush E having a row of bristles e, e along each side is mounted in bearings
formed in the brackets C, C2 parallel to the roller B and in such a position that
during its periods of rest the ends of the bristles e along the side adjacent to the
roller B touch the "dents" or wires of such roller as shown in Figure 1. The
brush E is intermittently turned half a revolution during each rotatoin of the roller B
by means of the segmental wheel D2 on the shaft D engaging the wheel Ez
connected to the brush E. These wheels are shown on a larger scaleğin Figure 5.
Flats E3, E3 are formed diametrically opposite each other upon the boss of the
wheel E2 and the arm E5 pivoted upon the stud E 6 bears upon the uppermost
flat as shown in Figure 5 and holds the brush stationary after each movement.
The tension of the spiral spring S stretched between the end of the arm E5 and
the fixed hook E 7 determines the pressure of the arm E5 upon the flats E 3. The
roller B is driven in the direction of the arrow shown in Figure 1 therefore the
brush E is rotated in the opposite direction and it is located in such a position in
relation to the warp that at each movement the bristles pass between the warp
threads and brush them in the opposite direction to that in which the warp is
moving consequently in case a warp thread is broken the broken end is brushed back
until engaged by the dents of the roller B.
The roller B is very lightly driven by the anti-friction roller B 4 mounted between
lugs B 5 on its end resting against the bottom of one of the two snails or inclines B 6

page_text: formed on the face of D 2 as shown on a larger scale in Figure 9. A spring F fixed
to the bracket C bears against the end of the journal spindle B 2 and normally
keeps the anti-friction roller B4 against the bottom of one of the snails B6 and
the inclination or angle of the snails is such that they normally drive the roller B
but in case it is retarded in any way as for instance by it having laid hold of a
broken end of warp the roller is free to stop and the further movement of the
snail moves the roller longitudinally in the direction of the arrow Figure 3.
Ratchet teeth B8 are formed on the other end of the roller B which teeth engage
the pawl H and positively hold the roller from revolving immediately its longitudinal
movement takes place and the further longitudinal movement of the roller forces the
pawl outwards. The pawl H is rigidly fixed on the short shaft H 2 mounted in a
bearing formed in the bracket C and the arm H 3 is fixed upon the other end of the
shaft H 2. The arm H 3 extends into the forked arm J of the bell-crank lever J2 and
its other arm J3 is coupled by the rod J 4 to the starting lever A 7. It will thus be
seen that before the longitudinal movement is completed the starting lever A 7 is.
disengaged from the usual notch A 8 (Figure 2) in the catch plate A9 of the loom
and it consequently springs inwards and stops the loom in the same way as when
stopped by the ordinary weft fork motion. To clear the pawl H from the teeth B 8
and leave the roller B free to be returned to its normal position the side J 5 of the
slot J 6 in the catch plate is horizontally inclined. This has the effect of forcing the
lever forwards as it springs inwards and thus drawing the rod J 4 in the direction of
its previous movement lifts the pawl clear of the teeth B 8.
When the lever A 7 is moved back to the position shown to re-star: the loom the
whole of the parts are thereby replaced in the position shown in Figures 1, 2 and 3.
And to make the spring F rigid enough to at once force the roller B longitudinally
back to its normal position the drop piece L is provided. This drop piece is pivoted
upon the stud Li fixed on the approximately vertical branch H 4 of the arm H 3.
The drop piece L is so arranged that as soon as the pawl H is forced back so as to
move the shaft H 2 and branch arm H 4 it drops down behind the spring F to the
position 'shown in Figure 4 and thus solidly backs up the spring. But as soon
as the roller B is pushed back far enough to clear the teeth B8 off the pawl,
projection L3 comes in contact with the end of the stud L4 fixed in the bracket C
and the slight further movement of the arm H4 causes the stud L4 to lift the
drop piece to the position shown in Figure 3. This leaves the spring quite
free and the only resistance opposed to the longitudinal movement of the roller B
when the next warp thread breaks and the loom requires to be stopped.
A projection L6 playing between the steady pins L7, L7 is provided on to
limit its movement. The pin F 2 fixed in the arm H4 is provided for the end of
the spring F to bear upon and confines its movement in relation to the arm H 4
in that direction. A weighted arm H 5 is preferably fixed to the short shaft H 2
and tends to keep the pawl H in its normal position until engaged by the
teeth B 8. A set screw H6 is fixed in a projection H 7 on the underside of the
pawl H by which the normal position of the pawl may be adjusted.
Instead of the light roller or bar mentioned in my Provisional Specification
mounted beneath the warp I prefer to employ the vibrating brush N. This brush is
mounted upon arms N 2 loosely pivoted to the quadrants N 3, N 3 in such a manner
that the said arms are free to move in relation to the quadrants within the limit
allowed by the projections N 4 and N 5 upon the quadrants. The quadrants N 3 are
fixed on the rocking shaft N 6 which is operated by the eccentric N 7 on the tappet
shaft connected to the arm N 8 on N 6 by the connecting rod N 9. The brush N
brushes the warp in its backward movement and it is withdrawn from contact with
the warp during its reverse movement. This is effected in the following way. In its
backwards movement the brush passes from the position shown in Figure 6 to that
shown in Figure 7 and it brushes the warp during the latter part of this movement
then on the reverse movement the quadrants N 3 commence to move without
practically moving the brush excepting to withdraw it from the warp and when
that has taken place the projections N3 upon the quadrants engage the arms N 2

page_text: as shown in Figure 8 and carry the brush forward until it falls over with its arms N 2
against the projections N 4 to the position shown in Figure 6.
A portion of the bristles of the brush E are preferably inclined as shown in
Figure 2 to more readily lay hold of the ends.
Both the bearings for the brush E and the roller B are of such a construction that
the brush and roller may be readily removed and replaced.
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 :
1. In a weaving loom, the combination with the roller B, of the brush E,
substantially as herein shown and described and for the purpose specified.
2. In a weaving loom, the combination with a warp stop roller capable of being
moved longitudinally when the warp engages it, of the mechanism connecting it
with the starting lever, substantially as herein shown and described.
3. The general construction and arrangement of mechanism for stopping the loom
when a warp thread breaks, substantially as herein shown and described.
Dated this 16th day of October 1896.
DRACUP & NOWELL,
Bradford, Patent Agents.