Improvements in Shuttles for Sewing Machines.
Year: 1894

page_text: Date of Application, 13th Apr., 1894
Complete Specification Left, 14th Jan., 1895-Accepted, 16th Feb., 1895
PROVISIONAL SPECIFICATION.
Improvements in Shuttles for Sewing Machines.
I, ALEXANDER ANDERSON, Manager of the Singer Manufacturing Company's
Works, Kilbowie, Dumbartonshire, do hereby declare the nature of this invention
to be as follows:-
This invention relates to sewing machine shuttles of the class in which a thread
reel or bobbin is carried on centres within the body of the shuttle and it has for
its object to improve the construction and operation of parts of such shuttles more
especially as used for card lacing and other heavy types of machines.
Under the invention the reel or bobbin is composed of a tube carrying at its
ends light discs or flanges and conical centre pins on which the reel turns. The
Conical centres are formed each with a stem which is passed through a ceutral
orifice in the disc or flange of the reel and into the end of the tube in which it is
locked by a pin or rivet passed through the tube and stem the disc or flange being
held between the end of the tube and a shoulder on the centre pin. The points of
the centre pins run in conical centres or bearings in the shuttle body one centre
being adjustable by screwing it through the end of the shuttle whilst the other is
free to slide in a socket to permit of insertion and withdrawal of the reel and is
kept in proper position by a spring in the socket tending to press it outwards.
For the purpose of maintaining uniform end pressure on the centres inde-
pendently of the weight of thread or cord on the reel a screw pin or pinching
screw is passed through the body of the shuttle to pinch the sliding centre piece
when the filled reel is inserted in place.
In order to prevent overrunning of the reel when a sharp jerk or sudden strain
is applied to the thread or cord a tension pad is provided to bear upon the surface
of the cord wound upon the reel the said pad being carried upon the end of a
spring lever centred within the shuttle body. The spring is fitted to bear upon a
heel part on the lever so as to apply the required pressure upon the reel when full
and as the reel empties and the pad nears the centre of the reel the action of the
spring becomes weaker. The pad may be formed by a palm or plate on the end of
the spring lever having serrations formed transversely of the convolutions of thread
on the reel or as is preferred the bearing face of the plate is covered with leather or
like material glued or cemented to the plate which is preferably bored with counter-
sunk holes into which the cementing substance enters and the better serves to hold
the leather to the plate.
The thread or cord passing from the shuttle is led through guides and under
the end of a flat tension spring on the outside of the shuttle body the end of the
spring being bent inwards and passing through an orifice in the shuttle body and
from the tension spring the thread or cord passes round a knurled guide pulley
centred between the shuttle body and a plate secured thereon.
Dated this 12th day of April 1894.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.

page_text: r
Improvements in Shuttles for Sewing Machines.
I, ALEXANDER ANDERSON, Manager of the Singer Manufacturing Company's
Works, Kilbowie, Dumbartonshire, do hereby declare the nature of this invention
and in what manner the same is to be performed, to he particularly described and
ascertained in and by the following statement:—
This invention relates to sewing machine shuttles of the class in which a thread
reel or bobbin is carried on centres within the body of the shuttle and it has for
its object to improve the construction and operation of parts of such shuttles more
especially as used for card lacing and other heavy types of machines.
The invention is illustrated by the accompanying drawings Figure 1 of which is
an elevation of the shuttle, Figure 2 a plan, Figure 3 a cross section on the
linex Figure 1, and Figure 4 a part section and part elevation of the thread
reel of the shuttle.
The reel or bobbin is composed of a tube B carrying at its ends light discs or
flanges C and conical centre pins D on which the reel turns. The conical centres D
are formed each with a stem d which is passed through a central orifice c in the disc or
flange of the reel and into the end of the tube B in which it is locked by a pin or
rivet 6 passed through the tube and stem, the disc or flange being held between the
end of the tube and a shoulder on the centre pin as shown at Figure 4. The points
of the centre pins run in conical centres or bearings E, E, in the shuttle body F.
one centre E¹ being adjustable by screwing it through the end of the shuttle F
whilst the other E is free to slide in a socket G to permit of insertion and with-
drawal of the reel and is kept in proper position by a spring H in the socket G
tending to press it outwards.
For the purpose of maintaining uniform end pressure on the centres E E¹,
independently of the weight of thread or cord on the reel a screw pin or pinching
screw I is passed through the body of the shuttle F to pinch the sliding centre
piece E when the filled reel is inserted in place.
In order to prevent overrunning of the reel when a sharp jerk or sudden strain
is applied to the thread or cord a a tension pad J is provided to bear upon the
surface of the cord wound upon the reel the said pad being carried upon the end
of a spring lever K centred at k on the shuttle body F. The spring k¹ is fitted to
bear upon a heel part on the lever K so as to apply the required pressure upon
the reel when full and as the reel empties and the pad nears the centre of the reel
the action of the spring becomes weaker a uniform tension being thus maintained
in sewing whether the reel be full or otherwise. The pad J may be formed by a
palm or plate on the end of the spring lever having serrations formed transversely
of the convolutions of thread on the reel or as is preferred the bearing face of the
plate is covered with leather or like material J₁ glued or cemented to the plate
which is preferably bored with countersunk holes into which the cementing
substance enters and the better serves to hold the leather to the plate.
The thread or cord a passing from the shuttle is led through guides a¹, a², and
under the end of a flat tension spring a³ on the outside of the shuttle body F the
end of the spring a³ being bent inwards and passing through an orifice in the
shuttle body as shown particularly at Figure 2 and from the tension spring a³
the thread or cord a passes round a knurled guide pulley a' centred between the
shuttle body F and a plate a secured thereon..
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :--
1. A sewing machine shuttle the parts of which are constructed, combined and

page_text: arranged to operate substantially as described with reference to the annexed
drawings.
2. A reel for a sewing machine shuttle composed of a tube having end flanges
secured thereon by means of centre pins entered in the tube ends substantially as
described.
3. In combination with a sewing machine shuttle, a tension pad carried on a
spring lever and arranged to operate substantially as described.
4. In combination with a sewing machine shuttle and its thread guides, the flat
tension spring a secured on the shuttle body and having its end bent and passed
through an orifice therein and the guide pulley a' centred on the shuttle body
substantially as described.
Dated this 12th day of January 1895.
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62, St. Vincent Street, Glasgow, Agent for the Applicant.