IMPROVEMENTS IN PREPARATORY STOP MOTION DOUBLING FRAMES
Year: 1880

page_text: LETTERS PATENT to Isaac Briggs, junior, of the Firm of J. Briggs & Sons,
of Wakefield, in the County of Yorkshire, Worsted Spinners, for an Invention
of "IMPROVEMENTS IN PREPARATORY STOP MOTION DOUBLING FRAMES."
PROVISIONAL SPECIFICATION left by the said Isaac Briggs, jr., at the
Office of the Commissioners of Patents on the 21st October 1880.
ISAAC BRIGGS, junior, of the Firm of J. Briggs & Sons, of Wakefield, in the
County of Yorkshire, Worsted Spinners. "IMPROVEMENTS IN PREPARATORY STOP
MOTION DOUBLING FRAMES."
My Invention has for its object improvements in preparatory stop motion
doubling frames for doubling yarns of any fibre in two or more folds; but parts
of the Invention are applicable to other machines and processes used for similar
and other purposes, whereby the general arrangement of the parts of such
machines is greatly simplified, thus enabling one attendant to accomplish much
more and better work than before.
My improvements also enable me to double softer yarns without fear of drawing
or breaking them.
I will now proceed to describe the general arrangement of parts according to my
Invention.
The bobbins containing the yarn in single thread are placed on suitable pins
within most convenient reach of the attendant. The thread from these bobbins is
carried forward towards the front of the machine through a hole or twizzle in the
detectors, which are constructed from carefully tempered light steel wire almost
balanced upon the pivot, so as to cause little or no strain upon the single threads.
From the detectors the threads pass on to my vertical rollers, which are a most
important and highly essential part of my improvements, and which will be
hereafter more fully explained, and from the rollers to the take up bobbins.
I prefer to put a slight twist in the threads as they pass on the take up bobbins
for the purpose of making the yarn draw off more easily in the after doubling
operation, and also to prevent "cork screwing." Thus the direction of the yarn is
almost straight from the single thread bobbins to the rollers, thus reducing the

page_text: friction on the single threads. Now immediately under the front end of the said
very sensitive detector wires is a series of driving band guards fixed into upright
bars, which are carried in suspension by a rocking longitudinal rail, so that
immediately any one of the single threads breaks, the front end of detector drops
and pushes the particular upright bar for that series off the rocking rail, when the
band guard immediately drops on to the driving band of that particular section
pushing it off on to the loose pulley, and at the same time bringing a projecting
arm against a projection or projections on the edge of the fast pulley, by which
the spindle is positively stopped without much overrun, thus leaving the broken
ends in such a position that they may at once be joined up without difficulty or
loss of time, which is a most important matter. During this time the other sections
of the machine run as before.
My vertical rollers secure to me very important advantages, such for instance, as
enabling the attendant to most readily put in new ends while the rollers and other
parts are in motion, and also of allowing the rollers to adapt the pressure to the
threads wherever they may be passing through them. These vertical rollers are
made with dome shaped tops, so as to greatly facilitate the placing of threads
between them. One of the two rollers I run upon a fixed centre, but the other is
hung on a pivot in a compensating cradle, which drops into a slot in the carrying
frame, the whole being kept up against the stationary roller by a counter weight
which is controlled in its movement by a stud, otherwise the compensating roller
may be brought entirely away from the stationary roller. Besides this, the
compensating roller may be lifted off its pivot in the before mentioned cradle,
or the cradle may be lifted out of the carrying frame, thus allowing the utmost
facility for cleaning any of the bearings from waste. These compensating vertical
rollers are applicable to many other machines, where equalization of pressure along
the whole length is required.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Isaac Briggs, jr., in the Great Seal Patent Office on the 21st April
1881..
ISAAC BRIGGS, junior, of the Firm of J. Briggs & Sons, of Wakefield, in the
County of Yorkshire, Worsted Spinners. "IMPROVEMENTS IN PREPARATORY STOP
MOTION DOUBLING FRAMES."
My Invention has for its object improvements in preparatory stop motion
doubling frames for doubling yarns of any fibre in two or more folds; but parts of
the Invention are applicable to other machines and processes used for similar and
other purposes, whereby the general arrangement of the parts of such machines is
greatly simplified, thus enabling one attendant to accomplish much more and better
work than before.
My improvements also enable me to double softer yarns without fear of drawing
or breaking them.
I will now proceed to describe the general arrangement of parts according to my
Invention.
The bobbins containing the yarn in single thread are placed on suitable pins
within most convenient reach of the attendant. The thread from these bobbins
is carried forward towards the front of the machine through a hole or twizzle in
the detectors, which are constructed from carefully tempered light steel wire
almost balanced upon the pivot, so as to cause little or no strain upon the single
threads. From the detectors the threads pass on to my vertical rollers, which are
a most important and highly essential part of my improvements, and which will
be hereafter more fully explained, and from the rollers to the take up bobbins.
I prefer to put a slight twist in the threads as they pass on the take up bobbins
for the purpose of making the yarn draw off more easily in the after doubling
operation, and also to prevent "cork screwing." Thus the direction of the yarn
is almost straight from the single thread bobbins to the rollers, thus reducing
the friction on the single threads. Now immediately under the front end of the
said very sensitive detector wires are a series of driving band guards fixed into
upright bars, which are carried in suspension by a rocking longitudinal rail, so that
immediately any one of the single threads breaks the front end of detector drops,
and pushes the particular upright bar for that series off the rocking rail, when the
band guard immediately drops on to the driving bands of that particular section
pushing it off on to the loose pulley, and at the same time bringing a projecting arm
against a projection or projections on the edge of the fast pulley, by which the spindle
is positively stopped without much overrun, thus leaving the broken ends in such
a position that they may at once be joined up without difficulty or loss of time,
which is a most important matter. During this time the other sections of the
machine run on as before.
My vertical rollers secure to me very important advantages, such for instance as
enabling the attendant to most readily put in new ends while the rollers and other
parts are in motion, and also of allowing the rollers to adapt the pressure to the
threads whenever they may be passing through them. These vertical rollers are
made with dome shaped tops so as to greatly facilitate the placing of threads
between them. One of the two rollers I run upon a fixed centre, but the other
is hung on a pivot in a compensating cradle which drops into a slot in the carrying
frame, the whole being kept up against the stationary roller by a counter weight
which is controlled in its movement by a stud, otherwise the compensating roller
may be brought entirely away from the stationary roller. Besides this, the com-
pensating roller may be lifted off its pivot in the before mentioned cradle, or the

page_text: cradle may be lifted out of the carrying frame, thus allowing the utmost facility for
cleaning any of the bearings from waste. These compensating vertical rollers are
applicable to many other machines where equalization of pressure along the whole
length is required.
My Invention will be more clearly understood by reference to the accompanying
Sheets of Drawings, where Figure 1 is an end elevation, and Figure 2 is a plan of
one section of a machine showing the details of the stop motion which I will now
proceed to explain-A is a bobbin containing the yarn in single thread, of which
there would be two, three, or more placed upon spindles b, b, b. The thread from
these bobbins is carried forward towards the front of the machine through the hole
or twizzle e' in the detectors c, c, c. From the detectors the threads pass on to iny
vertical rollers D and D', and from the vertical rollers to the take up bobbins E.
Now immediately under the front end of the said very sensitive detector wires are
a series of driving band guards F, fixed into upright bars G, which are carried in
suspension upon the shoulder K. Now immediately anyone of the single threads i
breaks the front end of the detector through which it passes, drops down between
the fixed bar H and the top of the upright rocking bar G, which has the effect of
pushing the bar G off the shoulder K, when it immediately drops carrying with it
the band guard F, Figure 3, and the band of that particular section of the machine
off the fast pulley P on to the loose pulley P', and at the same time the projecting
arm L falls on to the rim of the pulloy M, which is provided with one or more
projections m', which come in contact with the arm L, thus producing a positive
stop to that particular section of the machine, thus preventing much over-run and
leaving the broken ends in a convenient position for joining up without in-
convenience.
The book at the further end of the detector c is for the purpose of hanging a
weight thereon so as to lift one or more detectors out of the way when not
required.
It will thus be perceived that the arrangement of the vertical shafts N and the
vertical rollers D with the horizontal pulleys M and P, enable me to simplify the
stop motion and by gravity to obtain a positive stop movement and arrangement of
parts which has the effect of simplifying the machine and lessening the amount of
attention required. When the broken thread is joined up the vertical bar G is
lifted back on to the shoulder K, bringing with it the band from the loose pulley
P to the fast pulley P, thus again starting that particular section of the machine.
During this time the other sections of the machine run on as before.
I will now proceed to describe that part of my Invention which is of the greatest
importance, viz., the vertical rollers D and D', which will be found illustrated in
greater detail and on a larger scale on Sheet 2 of the accompanying Drawings.
Figure 4 is a front elevation of the rollers in the position they would assume
when at work; Figure 5 is a plan of the saine; Figure 6 is an end elevation with
the roller D' in the fore front; Figure 7 is an elevation of the cradle apart from the
rollers, and Figure S is a front elevation of roller D¹ removed out of gear away
from roller D.
The roller D is fixed to the vertical shaft N and drives the roller D' through the
wheels O and 0¹; the roller D¹ revolves upon the pivot P, which is fast to the
cradle R, and the cradle R is carried upon its trunnions r', by the swinging frame S
which turns upon the pivot s'; this frame S with its cradle R presses the roller D¹
against the fixed roller D with any desired pressure, which may be regulated by the
counter weight T, or by a spring or other suitable device. In any case the effect
produced will be to force the vertical rollers together in such a manner that the
pressure on the face of the rollers will be equally distributed along their whole
length, and by the compensating action produced by the cradle and swinging framo,
the rollers always press the threads at whatever part of the rollers they may be
running just as effectively as in the case of a horizontal dead weight roller. The
tops of both the rollers D and D¹ are made dome shaped, as shown by d¹, ď², d¹,

page_text: which allows the threads to lead into the nip of the rollers more easily. The loose
roller D' may be lifted off its pivot P at any time, and the cradle R may be lifted
out of the slotted bearings in the swinging frame S.
The special advantages of my machine are that the upright rollers enable the
attendant to put in new ends or threads while the machine is running, and it does
away with the necessity of tying in the single ends when the bobbin runs out or the
threads break and thus considerable time is saved; but besides these advantages I
obtain almost a straight run for the threads from the bobbin pins to the rollers.
Having thus described my said Invention and the manner for carrying the same
into practice, I would have it understood that what I claim is,-
•
First. The vertical compensating rollers with their several parts, and as illustrated
in the accompanying Drawings.
Second. The arrangement of parts in conjunction with vertical rollers constituting
the stop motion, substantially as herein set forth.
In witness whereof, I, the said Isaac Briggs, have hereunto set my hand
and seal, this Fourteenth day of April, in the year of our Lord One thousand
eight hundred and eighty one.
ISAAC BRIGGS. (L.S.)