IMPROVEMENTS IN SEWING MACHINES
Year: 1886

page_text: Date of Application, 13th Dec., 1886.
Complete Left, 26th Aug., 1887
Complete Accepted, 27th Sept., 1887.
tion for IMPROVEMENTS IN SEWING MACHINES to be as follows:-
My improvements relate to the method of giving motion to the lever carrying the
shuttle.
The bottom pinion which is geared into driving wheel is keyed, or fastened, to a
small crank shaft, the said crank having a sliding block or roll working into the end
of a lever, which lever carries at the opposite end, the shuttle.

page_text: I THOMAS SHAKESPEAR of The Royal Machine Manufacturing Company Limited
Small Heath, Birmingham, Manufacturer do hereby declare the nature of my
Invention and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement :-
My improvements relate principally to the method of giving motion to the lover
carrying the shuttle. For this purpose the bottom pinion which is geared into the
driving wheel is keyed or fastened to a small crank shaft. The crank of the crank
shaft has a sliding block or roll working in the end of a lever which lever carries at
the opposite end the shuttle.
The feed movement is taken either from the shuttle lever or direct from the crank
shaft from which the shuttle lever is worked as hereinafter particularly described and
illustrated in the accompanying Drawings.
Figure 1 represents in side elevation (partly in longitudinal vertical section);
Figure 2 in end elevation (partly in cross section) and Figure 3 in plan of underside,
a sewing machine containing my improvements; Figure 4 represents in side
elevation; Figure 5 in end elevation and Figure 6 in plan the two levers by which
the shuttle and feed movements are worked detached from the machine.
The same letters of reference indicate the same parts in Figures 1. 2. 3. 4. 5.
and 6.
a, a² is the shuttle lever turning horizontally on the axis c. The box end of the
arm a of the lever a, a' carries the shuttle d and the other arm a² is worked from the
hand driving wheel e in the following manner. Carried by the said hand driving
wheel e is a toothed wheel which gears with a pinion g keyed to the crank shaft h;
i is the crank on the inner end of the said shaft. The crank pin of the crank i carries
a sliding block k which works vertically in the box or seat at the end of the arm a³
of the shuttle lever a, a. As the crank shaft h is rotated through the gearing fg and
hand wheel e the pin of the crank i gives a rocking motion to the shuttle lever a,
the block k on the crank pin rising and falling in the box or seat in the end of the
shuttle lever as the crank makes its rotation. By the rocking motion thus given to
the lever
a³ the required reciprocating motion is given to the shuttle d carried by
the end of the arm a of the shuttle lever as will be understood by an examination of
Figure 3.
a,
m is the feed slide having a longitudinal movement and also a short rising and
falling motion on the centre n. The feed movement is taken from the shuttle
lever a, a' in the following manner. Under the shuttle lever a, a is a horizontal
lever p turning on the centre q on the framing of the machine. The end of the inner
arm of the lever p is forked and works upon a stud r on the underside of the outer
arm a of the shuttle lever a, a². The outer arm of the lever p works in the cut away
part at m² in the feed slide m. As the shuttle lever a, a' is worked in the manner
herein before described a rocking motion is given to the feed movement lever p and its

page_text: outer arms striking the ends of the cut away part m³ of the feed slide m the required
reciprocating motion is given to the said slide. The lifting motion of the feed slide m
is effected by the traversing motion of the outer arm of the lever p under the inclined
lower edge of the said feed slide m as seen in Figure 2.
The motion of the shuttle and the feed movement are in this way taken from the
crank shaft h of the machine driven from the hand wheel e through the toothed
gearing f, 9.
•
Instead of taking the feed movement from the shuttle lever it may be taken directly
from the crank shaft by means of a double cam. This modified arrangement is
represented in side elevation partly in longitudinal vertical section in Figure 7 and
plan of underside in Figure 8. The shuttle lever a, a' is worked in the same way as
in the arrangement Figures 1. 2 and 3 and corresponding parts are marked with the
same letters of reference. The lever p for working the feed slide m turns on the
centre p and is extended to the driving end of the machine the fore end of the said
lever at p being bent in the manner represented in Figure 8 to permit of the motion
of the crank i which works the shuttle lever and for the double cam to act upon. The
double cam is marked s, t and its shape is best seen in the separate view at Figure 7.
The said double cam is fixed upon the crank shaft h near the crank i. The rise t of
the double cam acts upon the shoulder p³ at the fore end of the feed lever p to give the
rocking motion to the said feed lever and the other rises of the double cam acts on
the upper side of the feed lever at the fore end to depress the said fore end and cause
its rear end to lift the feed slide m. The rear end of the feed lever p passes through a
loop in the feed slide m and the horizontal and vertical return motions of the feed lever
are effected by the coiled spring u.
Having now particularly described and ascertained the nature of my invention and
the manner in which the same is to be performed I declare that I claim as my
invention;
First. The construction and combination of the crank shaft h and crank i worked
from the hand wheel of the sewing machine through the gearing fg; the sliding
block k and lever a, a hereinbefore described and illustrated in the accompanying
Drawings for giving motion to the shuttles of sewing machines.
Secondly. The combination with the shuttle working mechanism claimed in claim 1
of the parts herein before described and illustrated in Figures 1. 2. 3. 4 and 6 of the
accompanying Drawings for working the feed slides of sewing machines.
Thirdly. The combination with the shuttle working mechanism claimed in claim 1
of the parts herein before described and illustrated in Figures 7 and 8 of the accom-
panying Drawings for working the feed slides of sewing machines.
Dated this Twentysixth day of August 1887.
W. T. WHITEMAN,
Agent for the Applicant.