IMPROVEMENTS IN YARN DOUBLING, TWISTING, OR FOLDING MACHINES
Year: 1878

page_text: PROVISIONAL SPECIFICATION left by Alexander Macdowall Fleming at the
Office of the Commissioners of Patents on the 9th April 1878.
ALEXANDER MACDOWALL FLEMING, of Greenock, in the County of Renfrew,
North Britain, Worsted Spinner. "IMPROVEMENTS IN YARN DOUBLING, TWISTING,
OR FOLDING MACHINES."
This Invention has reference to a new or improved mode of and means or.
arrangement of mechanical motion for the stopping or trapping of the motion of
the drawing rollers and doubling or twisting bobbins or their spindles in woollen,
cotton, or other yarn doubling, twisting, or folding frames or machines, whereby
much waste of yarn will be prevented and saved from running on to the twisting
bobbins after one end or thread has broken, effecting also a considerable saving in
the time of the attendants.
And the nature and novelty of the Invention consist in mounting each giving-off
bobbin, from which the yarn ends are unwound and led to their respective drawing
rollers and revolving twisting spindle and bobbin, upon a disc, which revolves
loosely with it on its spindle, and having a small stop, catch, lever, or pawl oscil-
lating on a fulcrum pin in it, with a pin in its inner arm projecting and working
down into a cam groove in the upper end or boss of a small pulley or wheel
mounted loosely on the lower part of the fixed spindle of and below the bobbin,
and driven in the same direction, but preferably at a much slower speed than the
bobbins and their discs, which are driven by and at the same rate as the yarn is
drawn off from the bobbins, and which by keeping the pin always running in the
cam groove revolving slowly below it holds the outer stopping arm of the paw!
always drawn in or out of its stop-acting position.
The cam bosses are driven at their slow speed by a light cord or band from the
driving drums of the rollers and spindles or by a cord or toothed wheels from the
thread roller. The cam bosses run on spindles fixed in a longitudinal iron or other
rail behind the drawing-off or thread rollers. Between the cam bosses is a fixed
tube in the longitudinal rail with vertical slots formed on its upper edge or lip,
through which tube a rod or spindle works, on which rod or spindle are mounted
radial arms loosely by a boss between two collars on its upper end, the lower part
D 077

page_text: working down through guides in and below the said bobbin and cam boss spindle
rail, all so as to actuate the shorter arm of one or two stop levers so placed and
fulcrumed (to some part of the frame below, and weighted as when the cross arms
enter the slots, and the rod and inner arms of the lever or levers are thereby
lowered) that the outer arm of the levers act on the under ond of the drawing
rollers and the twisting bobbin, or the friction or other driving cord pulley of the
spindle, so as thus to instantly stop these, and the further unwinding and taking
up of the yarn, whenever any one of the yarn ends breaks, and its giving-off
bobbin stops, which stopping has the effect of allowing a crescent or horned part
of the constantly revolving cam boss to overtake and draw in the pin and inner
end of the stop pawl on the bobbin disc, so as to throw and hold its outer arm and
turn it until it pushed the central radial stop arms into the stop grooves, which
thus stop the transmitting wheels or driving cord pulleys and the further unwinding
of the yarn from the other bobbins, and also through the lowering of the lever or
levers stop the drawing-off rollers and doubling and twisting spindles.
As soon as the attendants have re-attached the broken ends of the yarn to the
proper length, agreeing with the others, they can by a simple lever projecting out
in front of the frame or other equivalent arrangement for the purposo raise the
spindle of the stopping levers and cross arms out of the holding notches, and which
by a curved wire or arın above would push them round to their normal position
to hold up the stopping levers and allow all to go on again unwinding and doubling
and twisting, the slow motion of the cam groove and fast motion of the bobbin
discs keeping the stopping pawls out of action until another thread breaks, and its
yarn bobbin again stops.
It is to be understood that other equivalent arrangements of oscillating cam
levers and radial stopping arms and connecting rod and trap levers for acting on
the drawing roller and twisting bobbin and its spindle driving mechanism may be
employed, but the essential improvement consists in using the combined effect or
action of the stopping or retarding action of the bobbin (of which the yarn has
broken) with a revolving cam boss to actuate the arrangement of stopping levers
to stop or trap the other moving bobbins, and the drawing rollers and twisting
bobbin or its actuating spindle, all substantially as herein set forth.