IMPROVEMENTS IN MACHINERY OR APPARATUS FOR SPINNING AND DOUBLING COTTON AND OTHER FIBROUS MATERIALS
Year: 1878

page_text: LETTERS PATENT to Thomas Coulthard, of the Firm of H. Booth and Company;
of Preston, in the County of Lancaster, Machinists, for the Invention of
"IMPROVEMENTS IN MACHINERY OR APPARATUS FOR SPINNING AND DOUBLING
COTTON AND OTHER FIBROUS MATERIALS."
Sealed the 1st October 1878, and dated the 18th July 1878.
PROVISIONAL SPECIFICATION left by the said Thomas Coulthard at the
Office of the Commissioners of Patents on the 18th July 1878.
THOMAS COULTHARD, of the Firm of H. Booth and Company, of Preston, in the
County of Lancaster, Machinists. "IMPROVEMENTS IN MACHINERY OR APPARATUS
FOR SPINNING AND DOUBLING COTTON AND OTHER FIBROUS MATERIALS."
My Invention relates chiefly to arrangements for facilitating the doffing of full
bobbins and the starting of fresh sets, and is applicable to ring throstles of different
kinds.
In applying my Invention to the Booth-Sawyer ring throstle I attach to the
spindle above the bolster a braid, disc, or washer for holding the thread, so that it
may be broken during the operation of doffing, as herein-after described. I raise
the full bobbins simultaneously by means of a plate, so that they may be readily
removed from the spindles. The plate answers as a cover for the oil ducts in the
bolsters, and may be raised and lowered by a lever, cam, or other suitable means.
The operation of doffing by this plan is as follows:-When the bobbins are full
the ring rail is partially lowered and the lifting plate raised so as to detach the full
bobbins from the spindles, whereupon the ring rail is lowered to the bottom of the
traverse. The full bobbins are then lifted off the spindles. In the act of lifting
the bobbin the portion of thread between the bobbin and the traveller is caused to
pass over the braid or disc, and the thread, as it unwinds from the uplifted full
bobbin, winds itself around the spindle to the extent of about one turn. The
empty bobbin is then placed on the spindle and held by the attendant in such a
position as to trap or fasten the thread between its inner surface and the exterior of

page_text: the braid or disc. The thread between the full bobbin and the braid may then be
broken, after which the empty bobbin is pressed down to its bearing on the spindle.
The ring rail being brought into position for commencing a fresh set the frame may
be started.
In applying my Invention to the doffing of ring throstles in which a sleeve or
shell mounted upon the spindle surrounds and revolves around the bolster, I
dispense with the metal cup ordinarily provided near the lower end of the sleeve or
shell to receive and support the lower end of the bobbin, and in lieu thereof I make
the sleeve or shell at its lower end of somewhat enlarged diameter, the enlarged
portion filling the interior of the bobbin and serving as a support therefor. The
upper end of the enlargement forms a shoulder against which the bobbin traps or
fastens the thread in the operation of doffing, thus answering the same purpose as
the braid or disc. above described, as employed in connection with the "Booth-
Sawyer" spindle. By dispensing with the cup I am, moreover, enabled to employ
a lifting plate for raising all the bobbins in the frame simultaneously. Thus the
operation of doffing may be readily performed and the construction of the sleeve
portion of the spindle simplified.
.Instead of the enlargement at the bottom of the shell or sleeve the top may be
enlarged so as to support the bobbin about half way of its length, or a braid or
disc, as first herein-before described, may be mounted upon the spindle above the
shell or sleeve. In either case the trapping of the thread and the operation of
doffing may be effected in the manr already described.
An improvement with reference to the construction of spindles in which a sleeve
or shell mounted upon the spindle surrounds and revolves around the bolster,
consists in forming a reservoir of oil at the bottom of the bolster, and causing the
oil to work upwards to the top of the bolster when the spindle is running through
the medium of a rifled groove formed in the interior of the bolster. By this
arrangement oil may be conveyed to the upper bearings of the bolsters without
necessitating the removal of the spindles.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Coulthard in the Great Seal Patent Office on the 17th
January 1879.
THOMAS COULTHARD, of the Firm of H. Booth and Company, of Preston, in the
County of Lancaster, Machinists. "IMPROVEMENTS IN MACHINERY OR APPARATUS
FOR SPINNING AND DOUBLING COTTON AND OTHER FIBROUS MATERIALS."
My Invention relates chiefly to arrangements for facilitating the doffing of full
bobbins and the starting of fresh sets, and is applicable to ring throstles of different
kinds.
In the accompanying Sheet of Drawings Fig. 1 illustrates my Invention applied.
to the "Booth-Sawyer" ring throstle. To the spindle a, a little above the bolster b,
I attach a braid, disc, or washer x for holding the thread c, so that it can be broken
during the operation of doffing, as herein-after described. I raise the full bobbins
simultaneously by means of a plate d, so that they may be readily removed from
the spindles. The plate d answers its ordinary purpose as a cover for the oil ducts e
in the bolsters, and may be raised and lowered by a lever, cam, or other suitable
means.
The operation of doffing by this plan is as follows:-When the bobbins are full
the ring rail f is partially lowered (as indicated by the dotted lines f×) and the
lifting plate d raised (as indicated by the dotted line d×) so as to detach the full
bobbins g from the spindles a, whereupon the ring rail is lowered to the bottom of
the traverse, as shewn in the Drawing. The full bobbins g are then lifted off the
spindles. In the act of lifting the bobbin the portion of thread between the bobbin
and the traveller is caused to pass over the braid or disc x, and the thread as it
unwinds from the uplifted bobbin winds itself around the spindle to the extent of
about one turn. The empty bobbin h is then placed on the spindle and held by the
attendant in such a position as to trap or fasten the thread c between its inner
surface and the exterior of the braid or disc x. The thread between the full
bobbin g and the braid is then broken, after which the empty bobbin h is pressed
down to its bearing on the spindle (see dotted lines in Fig. 1). The bottom edge of
the bobbin is preferably roughened, nicked, or serrated to prevent the bobbin
revolving without also carrying the thread round with it upon the frame being
started. The ring rail being then brought into the position usual for commencing a
fresh set the frame may be started.
Figs. 2 and 3 illustrate my Invention as applied to the doffing of ring throstles,
in which a sleeve or shell i mounted upon the spindle a surrounds and revolves
around the bolster. I dispense with the metal cup ordinarily provided near the
lower end of the sleeve or shell to receive and support the bobbin, and instead
thereof I make the lower end of somewhat enlarged diameter, the enlarged portion j
filling the interior of the bobbin h and serving as a steadier therefor. The upper
end of the enlargement forms a shoulder against which the bobbin traps or fastens
the thread in the operation of doffing, thus answering the same purpose as the
braid or disc above described with reference to Fig. 1, as employed in connection
with the "Booth-Sawyer" spindle. By dispensing with the cup I am, moreover,
enabled to employ a lifting plate m for raising all the bobbins simultaneously.
Thus the operation of doffing may be readily performed and the construction of the
sleeve portion of the spindle simplified. The bottom end of the bobbin may,
moreover, be made of considerably larger diameter than when a cup is employed,
thus rendering the bobbin stronger and less liable to breakage.
Instead of the enlargement at the bottom of the shell or sleeve the top may be
enlarged, as shewn in Fig. 3, so as to steady the bobbin about half way of its
length; or a braid or disc, as first herein-before described, may be mounted upon
the spindle above the shell or sleeve. In either case the trapping of the thread and
the operation of doffing may be effected in the manner already described.

page_text: Figs. 4 and 5 show another form of braid or disc designed to afford more frictional
contact with the spindle.
Figs. 6 and 7 are respectively a sectional side view and plan of another arrange-
ment of a braid or disc (shewn enlarged) provided with slits or nicks, so as to form
openings, whereby the thread between the full bobbin and the traveller may be
more effectually secured preparatory to being trapped between the outer edge of the
discx and the interior of the bobbin, as herein-above described.
Having now described and ascertained the nature of my said Invention, and the
manner in which the same is to be performed, I desire it to be understood that what
I consider to be new, and claim as secured to me by the herein-before in part
recited Letters Patent is, the method of doffing ring and traveller throstles by
trapping the yarn, substantially as herein-above described with reference to the
accompanying Sheet of Drawings.
In witness whereof, I, the said Thomas Coulthard, have hereunto set my
hand and seal, this Sixteenth day of January, in the year of our Lord One,
thousand eight hundred and seventy-nine.
MILOV
NATI MI