Improvements in Sewing Machines.
Year: 1897

page_text: Date of Application, 23rd Mar., 1897-Accepted, 5th June, 1397
[Communicated from abroad by THE SINGER MANUFACTURING COMPANY, of
New York, United States of America, Sewing Machine Manufacturers.]
Improvements in Sewing Machines.
1, WILLIAM HARVEY INSLEE, Manager of The Singer Manufacturing
Company, Kilbowie, - Dumbartonshire, 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 has for its object to provide a single-thread chain-stitch sewing-
machine, of simple construction in which a looper carrying rock-shaft beneath the
work-plate is operated from a rotating crank of a driving shaft journalled in the
upper part of the bracket arm through a second rock-shaft, also beneath
the work-plate, and suitable connections which give properly timed rocking
movements to the looper shaft, so that the latter is particularly adapted to carry
a plurality of loopers co-operating with a plurality of needles carried by the
needle-bar, to form a plurality of parallel single thread chain stitch seams
simultaneously.
In the accompanying drawings
Fig. 1 is a sectional side view of my improved machine, with the face-plate
removed. Fig. 2 is a bottom view thereof.
Fig. 3 is a front end view and Fig. 4 a section through the vertical portion of
the bracket arm.
A denotes the work-plate and B the bracket arm in the upper part of which
latter is journalled the rotating driving shaft C having near its rear end a crank c,
and provided at its forward end with a crank c¹ connected by the pitman d with
the needle-bar D which will preferably carry a plurality of needles d. The
crank c is connected by a pitman c² to an arm e of a rock-shaft or rocker E having
a second arm el connected by a link or pitman f to an arm g of a looper-carrying
rock-shaft G provided at or near its forward end with one or more loopers g².
The arme is between the ends of the rock-shaft E and the link or pitman fis
curved so that it may, in the operation of the machine, extend beneath said rock-
shaft and thus connect the said arm e¹ with the arm g in such a manner as to secure
a proper timing of the rocking movement of the latter, as hereinafter described.
Preferably a plurality of these loopers will be employed to co-operate with a
plurality of needles carried by the needle-bar to form parallel single thread chain
stitch seams simultaneously.
By connecting the looper-carrying rock-shaft G with the crank on the rotating
driving shaft C through the second rocker or rock-shaft E, in the manner shown
and described, I am enabled to impart rocking movements to the said shaft G in
such a manner that the said looper-carrying shaft will have a "dwell" after the
loops of needle thread have been taken by the loopers, and the latter have moved
to their extreme forward position, this "dwell" continuing, with a very slight
reaction, while the driving shaft is performing nearly or quite one-half of its
revolution; so that proper timing of the looper or loopers, to enable the work to
be fed and the needle or needles to rise and again descend nearly or quite to the
work, is secured without requiring the use of a cam for operating the looper
carrying shaft. In other words I am enabled, by the construction herein shown

page_text: and described to operate the rocking looper-carrying shaft in proper time relative
to the other parts of the machine from a rotating crank on the driving shaft
journalled in the upper part of the bracket arm of the machine, aud thus secure a
smoothly working and silently running single thread chain stitch machine of
a desirable type particularly adapted for forming several parallel seams
simultaneously.
The feeding mechanism herein incidentally shown is not a part of the present.
invention, and need not therefore be herein described.
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. In a sewing machine, the combination with the bracket-arm B, of the
rotating driving shaft C journalled in the upper part of said arm and having the
crank c near its rear end, a needle-bar operatively connected with the forward end
of said shaft, the looper-carrying rock-shaft G placed beneath the work-plate and
having the arm g, the second rock-shaft E also beneath the work-plate and having
the arms.e and e¹, arranged relatively to each other, as shown, the pitman c² con-
necting said crank with the said arm e, and the curved link or pitmanf connecting
the said arms and g, said pitman being thus adapted to extend beneath the
said rock-shaft E, between the ends of the latter.
2. In a sewing machine, the combination with the bracket-arm B, of the rotating
driving shaft C journalled in the upper part of said arm and having the crank c
near its rear end, a needle-bar operatively connected with the forward end of said
shaft and carrying a plurality of needles, the rock-shaft G placed beneath the
work-plate and having the arm g, a plurality of loopers carried by said rock-shaft,
the second rock-shaft E also beneath the work-plate and having the arms e and el,
arranged relatively to each other, as shown, the pitman ² connecting said crank
with the said arm e, and the curved link or pitman f connecting the said arms e
and 9, said pitman being thus adapted to extend beneath the said rock-shaft E,
between the ends of the lattér.
"
Dated this 22nd dox of March 1907