Improvements in Sewing Machines.
Year: 1889

page_text: Date of Application, 31st May, 1889-Accepted, 6th July, 1889
COMPLETE SPECIFICATION.
[Communicated from abroad by THE SINGER MANUFACTURING COMPANY, of New
York, in the United States of America, Sewing Machine Manufacturers.]
Improvements in Sewing Machines.
I, ALEXANDER ANDERSON, Manager of the Singer Manufacturing Company's
Works, Kilbowie, Dumbartonshire do hereby declare the nature of this invention
and in what manner the same is to be performed, as communicated to me to be
particularly described and ascertained in and by the following statement :-
This Invention consists in adapting sewing machines to carry and be operated
with two oscillating or rotary shuttles for the under threads whereby two rows or
lines of lock stitches may be simultaneously produced in sewing fabrics.
In the accompanying drawings figure 1 is an end elevation and figure 2 a side
elevation of part of a sewing machine showing the invention applied thereto.
Figure 3 is a vertical section through the shuttle carrier showing the double raceway
and the shuttles and figure 4 is an elevation of the shuttle carrier. Figure 5 is a plan
view of the shuttle driver and figures 6 and 7 are respectively an elevation and plan
of the needle clamp.
b
As represented in these drawings the shuttle carrier A which is secured to a snug
formed on the under side of the machine bed B is open ended and formed with two
circular grooves or raceways a, a, into each of which is fitted a shuttle C of the
ordinary form used in oscillating or rotary shuttle-sewing machines the shuttles being
inserted into the raceways from the open ends of the carrier whilst the beaks or points
project through an opening at the top of the carrier and being placed with their beaks
pointing in the same direction but back to back so that the covers c which retain the
thread bobbins in place may be accessible for opening, to remove and replace the
bobbins, from the two opposite open ends of the carrier. In order also that such
access may be obtained to the rear shuttle thread the shuttle driver D which is fixed
on the rock shaft or spindle E is cranked or formed with an off-set portion at D¹;
and in order that the said driver may operate the shuttles simultaneously it is made of
such breadth that its ends at d, d, bear upon the heels of both shuttles and at d¹ d¹
upon the shoulders at. the bases of the beaks of the shuttles. A slot d² is formed in
the driver of such length and width as will permit of the two needles with which the
machine is provided passing through it in their vertical reciprocation with the needle
bar F to which they are secured by the clamp G in the manner indicated in the
drawings. The throat plate H and the presser foot I have each two holes formed in
them for the passage of the needles.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed as communicated to me
I declare that what I claim is :-
1. In a sewing machine an open ended shuttle carrier formed with two circular
race ways each adapted to carry a shuttle substantially as and for the purpose set
forth.
2. In a sewing machine the combination of an open ended shuttle carrier having
double raceway to carry two oscillating or rotary shuttles and a shuttle driver
constructed as described to actuate both shuttles and to permit of access to the bobbin
case of the rear shuttle substantially as set forth.

page_text: 3. In a sewing machine a shuttle driver formed with a cranked or off-set portion
between its actuating ends and the point of attachment to the driving spindle to
provide for access to the bobbin case of the shuttles operated by the driver substan-
tially as described.
Dated this Twenty ninth day of May 1889.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.