IMPROVEMENTS IN MACHINERY OR APPARATUS FOR SPINNING AND DOUBLING COTTON AND OTHER FIBROUS MATERIALS
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by Thomas Coulthard at the Office of
the Commissioners of Patents on the 7th May. 1881.
THOMAS COULTHARD, of Preston, in the County of Lancaster, Machinist.
"IMPROVEMENTS IN MACHINERY OR APPARATUS FOR SPINNING AND DOUBLING
COTTON AND OTHER FIBROUS MATERIALS."
This Invention has reference to ring spinning and doubling frames, and consists,
firstly, in providing means whereby the operation of starting a fresh set of empty
bobbins after the full bobbins have been removed or " doffed " may be expedited.
The bobbins according to my Invention are provided with one or more slits or
nicks cut across the top of the bobbin, the slits or nicks being designed to receive
and to retain or hold fast the end of the yarn or thread. The process of doffing is
performed in the usual manner, that is to say, the ring-rail is first lowered to the
bottom of the lift, and the full bobbin is lifted off the spindle. Before however the
yarn or thread is broken, it is drawn into the slit or nick across the top of the
empty bobbin, which has meanwhile been placed upon the spindle. The yarn or
thread is thus left in connection between the new bobbin and the front roller, and
the spindle and bobbin are in readiness for being set in motion to spin or double
as the case may be.
My Invention relates, secondly, more particularly to ring spindle apparatus of
the construction known as the "Booth-Sawyer," in which the bobbins extend
downwards and around the bolster. It is found in practice that the oil or lubricant
if supplied too liberally to this arrangement of spindle apparatus is apt to work out
over the top of the bolster, and finding its way down the interior of the bobbin is
thrown out in a centrifugal spray at the bottom of the bobbin and wasted, besides
being detrimental to the yarn or thread upon the contiguous spindles. To remedy
this evil I provide a guard or cup preferably of sheet metal for the purpose of
receiving the oil thrown off by the bobbin. The guard or cup is fixed upon the
bolster, and surrounds the lower end of the bobbin. The upper edge of the cup is
turned inwardly forming a lip or flange to prevent the oil escaping over the top,
and ensuring its return to the interior of the bolster; and at its lower end suitable
holes or oil ducts provide communication between the bottom of the cup and the
interior of the bolster.
In combination with the arrangement of cup above described, bobbins having
slits or nicks cut across the bottom instead of across the top. as first hereinbefore

page_text: described, may be employed for expediting the process of doffing. When the cup
is used in combination with slits or nicks at the bottom of the bobbin the operation
of doffing is performed as follows:-
The ring rail is lowered to the bottom of the lift in the usual way, and after the
full bobbin has been lifted off the spindle, the yarn or thread is drawn across the
top of the ring and consequently across the top of the guard or cup. The empty
bobbin is then placed upon the spindle. The upper edge of the cup being higher
than the bottom of the bobbin, when in position the yarn or thread will be caused
to enter the slits or nicks at the bottom of the bobbin upon its being slightly
turned round whilst being pressed down upon the spindle. The yarn or thread
connecting the full bobbin with the empty bobbin which has replaced it is then
broken and the frame is ready to start.