Improvements in the Manufacture of Lock-stitch Sewing Machines.
Year: 1889

page_text: Date of Application, 4th June, 1889
Complete Specification Left, 27th Feb., 1890-Accepted, 29th Mar., 1890
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Lock-stitch Sewing Machines.
I HARREY MOORE of High Street Wellingborough in the County of Northampton
do hereby declare the nature of this invention to be as follows:-
A hook of a particular shape is made to revolve in a circle under the article to be
sewn or stitched at the same rate of speed as that at which the needle is moving that
is to say the hook makes one complete revolution for each dip of the needle. This
hook catches into the loop left by the needle on its withdrawal and by its peculiar
shape (which shape is one of the subject matters of this invention) passes the loop
over a spherical or nearly spherical case containing a reel of thread which is running
out of such case through a small hole therein fitted with an ordinary appliance for
adjusting the tension of the thread. The spherical or nearly spherical case containing
the thread is kept in place within the circle described by each revolution of the hook
by two pivots fitting into small indentations made in the case for that purpose each
of the pivots being also fitted with a spring which allows of its being momentarily.
pushed back by the thread in its passage over the case the thread passing between
the case and the pivots which keep the case in position. The peculiar form of the
hook namely a rotary hook the cast-off of which is bevelled at such an angle as to
pass one thread of the loop left by the needle over the case containing the other or
under thread and the other thread of the loop under such case-and the spherical or
nearly spherical case for holding the reel of thread-and the spring pivots keeping
the case in position-and the combination of the three form the subject matter of
this invention.
Dated this Third day of June 1889
WILLIAM FISH,
Agent.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Lock-stitch Sewing Machines.
I HARREY MOORE of High Street Wellingborough in the County of Northampton.
Machine Agent, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement:-
My invention relates to improvements in lock stitch sewing machines and the
objects of my improvements are first to dispense with the ordinary shuttle and shuttle
carrier for the under thread and second to obviate the necessity of specially winding
spools to supply the under thread.
I attain these objects by the mechanism illustrated in the accompanying drawings
in which Figure 1 is an elevation partly in section of the under part of a sewing
machine illustrating those parts which are the subject matter of my improvements
and the usual table with the needle passing therethrough and the link motion and
driving shaft as adopted for ordinary machines employing a rotating hook to draw
the loop of thread from the needle. Figure 2 is a sectional view of the spool-sphere
opened in halves for admitting the cotton or other filament to be employed as the
underthread either wound upon a small reel or in the form of a ball. Figure 3 is a
plan of the spool-sphere fitted with its tension plate. Figure 4 is an end view of
the spindle L, Figure 1. Figure 5 is a sectional illustration of the spool-sphere.
bearing.
The hook A which I employ is of the peculiar shape shown in Figure 1.
C
It

page_text: rotates at a variable speed attained by means of the link mechanism B by which it is
connected with the rotating shaft in the manner usually adopted for sewing
machines employing a rotating hook which though rotating at variable speeds makes
regularly one complete revolution during the interval of time elapsing between each
successive dip of the needle.
In addition to the hook A for catching into the loop left by the needle on its
withdrawal I provide a spool-sphere D to contain the filament which is to be employed
as the under thread for locking the stitches. This filament may be wound on a
small reel or wound into ball shape and be enclosed in the spool-sphere D which is
made in two halves capable of being disconnected for the purpose of admitting the
reel or ball of cotton or other filament one extremity of which is passed outward
through a hole in the spool-sphere covered by the tension plate E having a slotted
hole F through which the filament finally passes to be carried up through the table of
the sewing machine in the usual manner. The tension of the tension plate E is
regulated by means of the screw G.
In opposite ends of the spool-sphere D I form the indentations H by means of
which it may be loosely supported in bearings consisting of a rounded point J fitted
in the axle of the hook A and another similar rounded point K fitted in an upright
pillar extending from a horizontal spindle L provided with a feather M to prevent
the spindle from rotating and a spring N.to bring it to the required position for the
bearings J and K to retain the spool-sphere D loosely supported in order that it may
yield as required to pass the loop of cotton or other filament carried by the hook A in
the manner hereinafter described.
In order to renew the supply of cotton or other filament in the spool-sphere D the
spindle L may be drawn through its bearings compressing the spring N until the
feather M is completely withdrawn allowing the spindle L to be partly rotated so as
to remove the upright pillar from its vertical position and thus allow the removal of
the spool-sphere from the machine.
The hook A hereinbefore referred to as of the peculiar shape shown in Figure 1 is
a rotary hook the cast off of which is bevelled at such an angle as to pass one
thread of the loop left by the needle over the spool-sphere D containing the under
or locking thread, and the other thread of the loop under the spool-sphere D
which yields alternately from its bearings J and K as the respective threads of the
loop pass these points.
The rounded points J and K represent spherical segments which should be less
than semi spheres as otherwise a point of rest might be provided for the threads which
are required to glide easily over these bearing points. Preferably they may take the
form of small anti-friction balls partially protruding through cup sockets in which
they may rotate upon contact of a thread passing between the ball bearing and the
indentation in the spool-sphere supported thereon. This arrangement is illustrated
by Figure 5 in which P is the anti-friction ball fitted in the cup or socket Q formed
at the extremity of the peg R one of which may be fitted into each, the axle of the
hook A and the pillar extending from the spindle L, to form the two bearings for
the spool-sphere D.
The tension plate E which I have described is fitted in a recess formed upon the
exterior of the spool-sphere D as shown in Figure 2 to avoid obstruction to the
passage of the threads over the surface of the spool-sphere D I do not however claim
this form of tension and any other form of tension may be employed which will
not obstruct the passage of the threads over the surface of the spool-sphere as
explained.
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
The combination of a spool-sphere D mounted so as to yield in its bearings, with
a rotary hook A shaped in a manner to distribute the loop thread upon the surface

page_text: of the spool-sphere so as to enclose the under thread fed from the spool-sphere
within each successive loop formed at the underside of the article being sewn sub-
stantially as set forth.
تيم
1
1800
AYRTON & THOMAS,
Agents for the Applicant.