AN IMPROVED BRAKE FOR THE BOBBINS OF THROSTLE FRAMES
Year: 1880

page_text: LETTERS PATENT to John Clayton Mewburn, of 169, Fleet Street, in the
City of London, Patent Agent and Consulting Engineer, for an Invention of
"AN IMPROVED BRAKE FOR THE BOBBINS OF THROSTLE FRAMES." A com-
munication from abroad by Charles Droulers-Vernier, of Lille, France.
PROVISIONAL SPECIFICATION left by the said John Clayton Mewburn at
the Office of the Commissioners of Patents on the 22nd April 1880.
JOHN CLAYTON MEWBURN, of 169, Fleet Street, in the City of London, Patent
Agent and Consulting Engineer. "AN IMPROVED BRAKE FOR THE BOBBINS OF
THROSTLE FRAMES." [A communication from abroad by Charles Droulers-Vernier,
of Lille, France.]
This Invention consists of an improved brake for the bobbins of throstle frames.
This brake is constructed as follows:-The bobbin is placed upon a spindle and
rests on a plato; the plate has a stud to take into a recess in the base of the
bobbin so that the latter is drawn into the rotary movement. The plate rests on a
disc which is itself supported by shoulders on vertical pins which are rivetted to a
lower disc. The shoulders on these pins are for the purpose of keeping the two
discs at a certain distance apart. This distance is necessary in order that washers
may be placed between the discs when the thread or yarn requires more tension.
These parts are so regulated that for delicate threads or yarns only the two discs
are employed. If it be desired to increase the tension a little one washer is used,
and a second, third, and fourth washer are added according to requirement until the
desired friction is obtained.
After repeated trials the material most suitable for the brakes has been found to
be buff leather or buff-skin.
The lower disc before described rests upon two plates covered with buff-skin and
carried at the ends of levers. These lovers under the influence of the weight
which they carry move on a horizontal axis or fulcrum, so that brakes covered with
buff-skin which they carry at their other ends are brought into contact with tho
periphery of the plates which supports the bobbin.
It will be seen that the power of the brakes increases with the weight which
causes them to act, that is to say, with the weight of the bobbin, discs, and washers.
When threads or yarns more or less strong are being operated on, the weight is
increased or diminished by adding or removing one or more of the washers.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Clayton Mowburn in the Great Seal Patent Office on the
22nd October 1880.
JOHN CLAYTON MEWBURN, of 169, Fleet Street, in the City of London, Patent
Agent and Consulting Engineer. "AN IMPROVED BRAKE FOR THE BOBBINS OF
THROSTLE FRAMES." A communication from abroad by Charles Droulers-Vernier,
of Lille, France.
This Invention consists of an improved brake for the bobbins of throstle frames.
This brake is represented in the annexed Drawings, and is constructed as follows:-
The bobbin F is placed upon a spindle B and rests on a plate D; the plate D has a
stud S to take into a recess in the base of the bobbin so that the latter is drawn
into the rotary movement. The plate D rests on a disc b which is itself supported
by shoulders on vertical pins h, h, which are rivetted to a lower disc a. The shoulders
on these pins are for the purpose of keeping the two discs at a certain distance apart.
This distance is necessary in order that washers, represented at m, n, r, may be
placed between the discs a and b when the thread or yarn requires more tension.
These parts are so regulated that for delicate threads or yarns only the two discs are
employed. If it be desired to increase the tension a little one washer is used, and
a second, third, and fourth washer are added according to requirement until tho
desired friction is obtained.
After repented trials, the material most suitable for the brakes has been found to
be buff leather or buff-skin. In the apparatus shown in the Drawings the lower
disc a before described rests upon two plates covered with buff-skin d, d², and carried
at the ends of levers L, L. These levers under the influence of the weight which
they carry move on horizontal axes or fulcra ƒ, ƒ, so that brakes G, G', covered with
buff skin, which they carry at their other ends, are brought into contact with the
periphery of the plate D which supports the bobbin.
It will thus be seen that the power of the brakes increases with the weight
which causes them to act, that is to say, with the weight of the bobbin, discs, and
washers. When threads or yarns more or less strong are being operated on the
weight is increased or diminished by adding or removing ono or more of the
washers.
And having now described the nature of the said Invention, and in what manner
the same is to be performed, I declare that I claim the improved brake constructed'
and acting substantially as and for the purpose hereinbefore described.
In witness whereof, I, the said John Clayton Mewburn, have hereunto set.
my hand and seal, this Twenty first day of October, One thousand eight.
hundred and eighty.