IMPROVEMENTS IN MACHINERY FOR WINDING OR DOUBLING YARNS OR THREADS
Year: 1872

page_text: PROVISIONAL SPECIFICATION left by John Boyd at the Office of the
Commissioners of Patents, with his Petition, on the 10th October
1872.
I, JOHN BOYD, of Glasgow, in the County of Lanark, North Britain,
Engineer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN MACHINERY FOR WINDING OR DOUBLING YARNS OR THREADS,"
to be as follows, that is to say:
This Invention relates to machinery for winding single yarns or
threads, and to machinery in which two or more yarns or threads are
wound together or "doubled" and wound upon each of a number of
bobbins, and comprises improvements in the general arrangement, and
improved means for pressing the bobbins into driving contact, and for
lifting them out of contact when full, or when any one of the yarns or
threads breaks or fails.
The framing of the machine as arranged for winding single yarns or
threads consists of two or more transverse arch-shaped standards
connected by a horizontal longitudinal girder, which is by preference in
the form of a longitudinally ribbed pipe; a horizontal longitudinal shaft
is carried centrally in bearings on the standards and girders, and has fixed

page_text: on it a number of pulleys, each of which drives two winding bobbins, one
on each side, each bobbin is carried by a pair of arms on a rocking
spindle, which is hollowed on its inner side for lightness, and one of the
arms is clongated to serve as a handle, whilst on the other side of the
rocking spindle there is a slotted arm herein-after referred to. At
intervals along the machine transverse brackets are fixed on the top
of the central girder, and each bobbin carrier is centred on the outer
ends of a pair of these brackets, the connection being made by a
pin at each bracket inserted from the hollowed part of one bobbin
carrier so as to serve in each case for two adjacent carriers. A weighted
lever is jointed to the under side of the central girder so as to project
through the slotted arm of the bobbin carrier, and the part of the lever
bearing against the bottom of the slot is of a peculiar curved form,
found by placing the carrier successively in the different positions it
assumes as the bobbin fills, and then for each position allotting a
movement to the weight corresponding to the pressure with which it is
desired the bobbin shall be pressed against the driving pulley. At the
part of the lever corresponding to the position of the bobbin carrier,
when the bobbin is as full as it is intended to be, and which position
it is preferred to have vertical, there is an abrupt change of shape
such that the lever then moves the bobbin completely out of driving
contact, instead of pressing it inwards as it did previously. The move-
ment of the bobbin carrier is limited by stops formed on the brackets.
The traverse guides are fixed on horizontal longitudinal bars moved by
levers at the end of the machine, these levers are centred near the floor,
and are actuated by helical cams formed with or fixed to worm wheels,
which gear with a worm on a vertical shaft driven through bevil wheels
from the central longitudinal shaft. The worm, the cams, and the
antifriction rollers on the levers that the cams act on, are all adjustable
as to height, so that the extent of the traverse movement may be easily
altered.

page_text: and being jointed to an arm projecting from the rocking spindle of the
bobbin carrier, makes that carrier lift the bobbin out of driving contact;
the action of the curved lever herein-before described carrying the parts
far enough to take the balanced lever quite clear of the revolving ratchet
or wiper, and to put the bobbin against a fixed brake, which stops its
motion, and which is by preference a spring brake. The detectors are
constructed so as that whilst being heavy enough to act with certainty
on the balanced lever, they do not exert too great a strain on even the
finest yarns or threads. For this purpose each detector which is by
preference a vertical strip of metal or doubled wire guided vertically is
made with two or more hooks, and each yarn or thread after passing
under one hook of its detector, next passes over a fixed guide wire, and
then under the next hook, so that the strain on each part of the yarn or
thread is equal to only the weight of the detector divided by the number
of its hooks..