Year: 1887

page_text: Date of Application, 10th Mar., 1887.
Specification Accepted, 15th Apr., 1887.
1, Charles BraDBURY, of 87 Torrens Road, Brixton in the County of Surrey,
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:-
This invention relates to lockstitch sewing machines working with a vertically
rotating shuttle, and has reference to the construction of such shuttles and the means
of imparting motion thereto.
C
I will proceed to describe the said improvements with reference to the accompanying
drawing in which Fig. 1 shews a side view of sewing machine having the said
improvements applied thereto, Fig. 2 shows a sectional plan, Fig. 3 shews a front
end view, Fig. 4a back end view, Figs. 5 to 9 shew enlarged views of the improved
constructions of shuttles. Figs. 5 & 6 shew respectively a front view and plan of one
construction of shuttle and Fig. 7 shows the same with the cover opened. The
shutile consists of a semicircular frame formed with a pointed beak a at the front end
and rounded off at a' at the rear end, and having convex or bulged sides and c, of
which is formed as a cover opening on a hinge at d, and secured when closed by a
spring catch, one end of which is fixed to the cover by screws m, while the other end
has a bolt that springs into a slot o formed in the shuttle frame; the catch is
provided with a ribe projecting through a slot in the cover, so thai by pressing the
rib inwards, the bolt a is withdrawn, enabling the cover to be opened. Upon the
inner surface of the side is fixed a pin serving as pivot for the reel of thread to
revolve upon, and on the frame of the shuttle is fixed a hook over which the thread
from the shuttle is passed. From this hook the thread is passed through a notch in
the cover e and under a tension springs fixed by a screw to the cover c, and which
presses the thread between it and the surface of the cover with a pressure that can be
regulated by the screw.
From this tension spring the thread is led through an external hole in the rib e
from which it passes to the fabric. When the cover c is closed down the open side
of the notch is also closed by the shuttle frame, so as to constitute a hole through
which the thread passes out of the shuttle.
In the modification of this construction of shuttle shewn in front view and plan at
Figs. 8 & 9, the semi-circular frame has a beak at the front end and and is rounded at
the rear end as before, but instead of the entire shutile being hollow it is only formed
with a central cylindrical cavity formed in projections on each side of the frame the

page_text: centre line of which nearly corresponds with the centre line of the semicircular frame,
and which is closed at one end for the reception of the reel (shewn detached at Fig. 9)
while at the other open end it has a pivotied spring bar which, when the reel is
inserted is turned over the open end of the cavity, as shewn at Fig. 3, so as to retain
the reel therein. On the front side of the projections are formed inclined surfaces
sloping down to the thickness of the frame, which effect the opening out of the loop
of the needle thread as the beak of the shuttle passes through it.
The shuttle thread passes from the reel first through a passage to the outside
of the cavity then under the tension spring S acting as before described, and passes
thence through a hole up through the-fabric. The shuttle race consists of a ring A
fixed to the bed plate and having a circular groove in which the shuttle runs, the
lower half of the front part of this groove being formed by a semi-circular plate B
pivotted to the other pari at B' and fixed thereto at the other end by a thumb screw C
so that on loosening this screw, the part A can be turned down on its pivot and the
shuttle be introduced or removed.
Rotary motion is imparted to the shuttle as follows:-
Beneath the bed-plate is a shaft w driven from the main shaft w above as will be
presently explained, and having projecting from a disc on its front end, an arm
that projects into the central hole of the shuttle race and carries a spring that
presses slightly upon the straight rounded edge of the shuttle, so as to keep it in its
groove as it is pushed round by the arm . The shaft receives its motion from the
driving shaft by means of an excentric E whose rod E' slides with a slot upon a
swivelling block F Fig, forming the fulcrum, and has its lower end pivoited to a
slide S working in a dovetail groove of the disc S fixed on the shaft .
bined action of the excentric E and the sliding connection of its rod E' with its
fulcrum will be to cause the lower end of the rod to move in an oblong or pear
shaped path, which motion being imparted to the shaft through the slide S¹
will cause the shaft, and consequently the shuttle to revolve with a variable speed,
the motion being accelerated as the shuttle passes through the loop of the needle
thread.
The com-
The needle bar is actuated from the shaft by a crank K and connecting link K'.
The thread regulator Fig. 1 is actuated by a cam on the shaft w so as to be inde-
pendent in its movements of those of the needle bar. The other parts of the machine
are of known construction and need not be further described.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed I declare that what I claim is :-
1. The construction of rotary shuttles for sewing machines substantially as herein
described with reference to Figs. 5, 6 & 7 of the drawings, having a hook u at its side
over which the thread of the reel is passed, a notch Ztension spring S and catch a m
with projecting rib, having a hole e, the shuttle thread being passed through or under
these parts as herein set forth.
2. The construction of rotary shuttles substantially as herein described with reference
to Figs. 8 & 9 of the drawings, having a shuttle bed closed on one side by a pivotted
spring bar, and having a passage, o e, a tension spring S and a hole i, through and
under which the shuttle thread is passed as set forth.
3. Imparting a variable rotary motion to a shuttle by means of a shaft ¹ driven
from an excentric E on the driving shaft through an excentric rod E' sliding with a
slot on a pivotted pulcrum pulcrum and having its end connected to a slide S¹
sliding in a groove on a disc S on the shaft ¹, substantially as herein described.
Dated this 10th day of March 1887.
ABEL & IMRAY,
Agents for the Applicant.