IMPROVEMENTS IN MULES AND TWINERS FOR SPINNING AND DOUBLING."
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by John Chisholm at the Office of the
Commissioners of Patents on the 19th December 1877.
" CERTAIN
JOHN CHISHOLM, of Oldham, in the County of Lancaster, Machinist.
IMPROVEMENTS IN MULES AND TWINERS FOR SPINNING AND DOUBLING."
My present Invention consists in certain improvements upon the Inventions for
which former Letters Patent were granted to me on the 9th day of April 1873,
No. 1316, and on the 20th day of October 1874, No. 3601.
The object of my Invention is to take up and make tight, immediately before
the backing off commences, the backing-off chain which has been made slack by
depressing the faller wire until it is near to the spindle point.
Referring to the Patent No 3601, 1874, I fix on the faller shaft a lever, the end
of which moves up a fixed incline as the carriage moves out from the rollers, and
completes the outward stretch. This incline is adjustable on a stationary part of
the headstock.
On the snail plate, to which one end of the backing-off chain is fastened, I attach
another chain, practically forming a continuation of the backing-off chain; or, if the
construction of the mule will permit, I attach the second chain to a hoop loose on
the same shaft which carries the snail plate, but having a projection which overlaps
a similar projection on the snail plate. The other end of this second chain I attach
to a lever, the opposite arm of which rests upon the carriage square or frame, and
forms a stop for the backing-off chain. At the end of this lever arm I forin or attach
an incline, which, coming in contact with a fixture on the framing near the com-
pletion of the stretch, raises that end of the lever and depresses the other to which
the chain has been attached, thereby turning the snail plate in the direction in
which it moves while backing off, and tightening the chain which would otherwise
have been left slack at every stretch on depressing the faller wire near to the spindle
point. Between the end of the second chain and lever arm I interpose a spiral
spring to prevent breakage by error of adjustment.
The chain being tightened, the faller wire is depressed by the backing-off cam
referred to in the Specification of my former Patent, No. 3601, 1874.
The arrangement has to be slightly modified on being applied to twiners where
the fallers are stationary, as described in the Specification of my former Patent,

page_text: No. 1316, 1873. Attached to the framing and underneath the fallers I place a
lever, the top end of which has an incline, which is moved under the lever fixed on
the faller; the bottom end of the first lever is acted upon by a projection on the
slide which carries the copping plates, and by the outward motion brings the incline
under the lever on the faller and depresses the fuller wire, as before described. One
end of the backing-off chain is attached to the snail plate or to the loose hoop before
referred to, and the other end to a lever provided with a projection to form a stop
to the backing-off chain, the centre of motion being fixed to the stationary framing.
On the slide before referred to, or on the connecting rod attached to the slide which
is moved by the radial arm, I attach an adjustable fixing, which is made to act
upon the lever to tighten the second chain when the faller wire is depressed near to
the spindle point.