IMPROVEMENTS IN SPOOLING APPARATUS FOR SEWING MACHINES
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by Lorentz Albert Groth at the Office
of the Commissioners of Patents on the 3rd November 1881. A communi-
cation from abroad by Robert Steiner, of Graz, in the Empire of Austria.
LORENTZ ALBERT GROTH, K.G.V., Civil Engineer and Proprietor of the
Scandinavian Patent Office, under the Firm of L. A. Groth & Co., 97, Finsbury
Pavement, London, E.C. 'IMPROVEMENTS IN SPOOLING APPARATUS FOR SEWING
MACHINES." A communication from abroad by Robert Steiner, of Graz, in the
Empire of Austria.
"
This Invention is specially applicable to what are known as Singer machines,
and to others of similar construction.
Singer sewing machines as heretofore manufactured have defective apparatuses
for unwinding from the reels the thread intended to form the underthread, and
for winding the said thread on the shuttle spools.
Most of these machines are so constructed that the flywheel and the driving
pulley are cast in one piece and connected with the shaft of the machine by means
of a pin.
The spooling apparatus is usually made on the base or frame of the machine,
and the spindle of this apparatus is furnished with an indiarubber friction roller,
which works on the outer edge of the fly wheel and is put in motion by the latter.
Thus when it is necessary to perform a spooling operation the whole sewing
apparatus is put in motion, which on the one hand renders the spooling difficult,
and on the other hand wears out needlessly the mechanism of the machine.
Recently many makers have adapted the fly wheel to the shaft with a spring,
a latch, or a disconnecting pin, for the purpose of putting in and out of gear, the
spooling apparatus was however kept up by means of indiarubber friction roller.
In all these means of disconnecting the fly wheel there exists the inconvenience
that this releasing apparatus is quickly worn out, and the wheel becomes loose and
shaky on its shaft, which not only occasions a noise but also produces an injurious
effect on the whole mechanism of the machine.
The indiarubber ring on the friction roller is also subject to considerable friction,
which produces heavy wear and tear, necessitating a frequent change of the said
indiarubber ring. All these inconveniences are avoided by the spool contrivance
D "

page_text: and self spooling apparatus belonging thereto forming the subject of the present
Invention, the essential features of which consist in making the spooling apparatus
independant of the sewing apparatus; by the separation of the driving pulley
from the flywheel and in a peculiarly constructed self spooling apparatus. In order
to separate the driving pulley froin the fly wheel, the fly wheel of the sewing
machine has a lengthened boss on which the driving pulley turns loosely; by the
side of this driving pulley, and by preference forming one piece therewith, is a tooth
wheel intended to actuate the spooling apparatus.
On the aforesaid boss of the flywheel is placed a set collar through which a
pin is passed connecting the said set collar, the boss, and the shaft of the machine
firmly together. This fastening may also be effected if preferred by means of a
suitably adapted screw. By means of a set screw placed about 20mm from the
centre of the shaft and passing through the flywheel, the driving pulley with the
tooth wheel on it can be clamped to the set collar, so that the driving pulley can
be connected fast to the shaft so as to enable it to set the sewing apparatus in
motion.
When the set screw is withdrawn the driving pulley runs freely on to the boss
of the flywheel.
The driving gear of the spooling apparatus can be put in gear with the tooth
wheel in the driving pulley, so that when the spooling apparatus is employed the
sewing apparatus remains at rest.
The frame or support of the spooling apparatus consists of two parts, one of which
is fastened by a screw to the part of the standard of the sewing machine corre-
sponding to the toothed driving gear, the other part is fastened by a screw to a
pin or stem on the first named part. In this first named part is a spindle turning
in bearings which carries at one end a small tooth wheel, which.during the spooling
operation gears into the tooth wheel on the driving pulley. A groove is turned in
the bearing of the aforesaid spindle into which a pin is pushed, which serves to
hold the small tooth wheel in gear with the larger one during the spooling
operation. A spring holds the spindle with its tooth wheel out of gear when
spooling is not required to be done, it also holds the spool while the latter is being
filled in the spooling apparatus. The second part of the spindle carries a conical
prolongation of about 20/m which can be used with advantage to carry a
sharpening stone for sharpening needles or a wooden spool or reel for the winding
of the skein silk or linen thread, in which case the said part of the spooling
apparatus can be turned downwards by loosening a scrow in order to enable the
free front end of the spindle to be used.
At this second part of the spooling apparatus is also adapted the self spooling
apparatus or thread guide.
A
This con-i-ts of the following parts -A circular sector which is screwed to
the upper end of the spooling apparatus. At one end of this sector is formed
an eye, and beside the eye a small hollow for the purpose of winding the
thread round the sector, whereby the thread receives a certain tension.
flap is also adapted to the same part of the spooling apparatus, and can be
turned round on a screw being pressed against the spool by a spring screwed to
this part of the spooling apparatus, the end of such spring bearing against a stop
on the flap. At the lower part of the standard of the sewing machine is fixed a
guide eye. In order to wind the thread which is being unwound from the reel as
tightly as possible on to the spool, it runs first through the eye on the sector into
the hollow of the same and is wound round therein, it then passes through the eye
on the lower part of the machine standard, then over the sector and under the
pressure of the flap on to the spool.