IMPROVEMENTS IN SHUTTLES FOR SEWING MACHINES
Year: 1876

page_text: LETTERS PATENT to James Warwick, of the City Sewing Machine Works,
Manchester, in the County of Lancaster, Sewing Machine Manufacturer, for the
Invention of "IMPROVEMENTS IN SHUTTLES FOR SEWING MACHINES."
Sealed the 16th September 1876, and dated the 27th June 1876.
PROVISIONAL SPECIFICATION left by the said James Warwick at the
Office of the Commissioners of Patents on the 27th June 1876.
JAMES WARWICK, of the City Sewing Machine Works, Manchester, in the County
of Lancaster, Sewing Machine Manufacturer. "IMPROVEMENTS IN SHUTTLES FOR
SEWING MACHINES."
My Invention consists in so constructing the shuttles of sewing machines that
the threading thereof is greatly facilitated, and the threading holes usually required
are entirely dispensed with.
In performing my Invention I convey the thread from a reel of the ordinary
construction behind a bar placed within the shuttle, as usual, I then convey it
between the head of a screw and a flat spring, and by turning the screw round the
requisite tension may be obtained, the thread is then taken through a slot in the
side of the shuttle from which it is guided under the top spring in the usual manner.
I prefer to make the under side of the head of the screw above referred to tapered,
to facilitate the passing of the thread between it and the spring, and also to roughen
or mill the outer edge of the screw head, and to make a projection on the spring to
act as a catch on the head to prevent the screw getting loose.
A disc may be placed between the under side of the screw head and the spring.
The end of the spring fits in a hole in the nose of the shuttle, or it may be secured
by solder or otherwise.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said James Warwick in the Great Seal Patent Office on the 14th December
1876.
JAMES WARWICK, of the City Sewing Machine Works, Manchester, in the County
of Lancaster, Sewing Machine Manufacturer. IMPROVEMENTS in SHUTTLES FOR
SEWING MACHINES."
My Invention consists in so constructing the shuttles of sewing machines that
the threading thereof is greatly facilitated, and the threading holes usually required
are entirely dispensed with.

page_text: And in order that my Invention may be fully understood and readily carried
into operation I will proceed to describe the accompanying Sheet of Drawings.
Fig. 1 is an elevation; Fig. 2, a longitudinal section; Fig. 3, a plan; Fig. 4,
another plan, seen from below; and Fig. 5, a transverse section of a shuttle for a
sewing machine constructed according to my improvements; Fig. 6 is a detached
view of a spring forming part of the same. The Drawing is made twice the real
size in order that the parts may be clearly shewn.
a is the shell or body of the shuttle; b, the reel; c, is the top spring; and d, the
guide bar, these parts are made in the ordinary manner, excepting that the usual
threading holes in the side of the shuttle are dispensed with, and in lieu thereof
I use the curved slot e, the inner end of which is recessed to hold the thread. Near
the nose of the shuttle is a tapped hole to receive the screw f, the head of which
presses against the spring g, and I prefer to make the under side of the head of the
screw and one side of the springy taper to facilitate the passing of the thread
between them, the end of the spring enters into a recess in the nose of the
shuttle, as shewn in Figs. 2 and 4, or the end of the spring may be soldered or
otherwise attached to the shuttle. The circumference of the head of the screw f
is roughened or milled, and the inner end of the spring is turned up, as shewn
in Fig. 6, to act as a catch against the said roughened or milled head to prevent it
from working loose.
In some cases a disc may be placed between the under side of the screw head f
and the spring g.
The thread is conveyed from the recl b behind the bar d, then between the head
of the screw f and the flat spring g, and by turning the screw round the requisite
tension may be obtained, the thread is then taken through the slot e in the side of
the shuttle, from which it is guided under the top spring c in the usual manner.
The hooked recess at the end of the slot e prevents the thread getting out of the
slot when the shuttle is at work.
By means of this improved shuttle the attendant can pass the thread between
the parts by which the desired tension is obtained with great facility, whereas in
shuttles of the ordinary construction the thread was passed through one or more
holes to give the tension or drag.
Having thus stated the nature of my Invention, and described the manner of
performing the same, I wish it to be understood that I do not limit myself to
the precise details given, as they may be modified; but what I claim as my Inven-
tion is―
The improved sewing machine shuttle in which the holes in the side are dispensed
with, and in which the tension is given by an improved arrangement of screw and
spring.
I also claim the slot in the side of the shuttle with the hooked recess at the end
for the thread to pass through, and the milled or roughened circumference of the
head of the tension screw and the spring catch for retaining the same, all as shewn
and described.
In witness whereof, I, the said James Warwick, have hereunto set my hand
and seal, this Thirteenth day of December, One thousand eight hundred and
seventy-six