Improvements in Sewing Machines.
Year: 1891

page_text: Date of Application, 7th Apr., 1891
Complete Specification Left, 4th Nov., 1891-Accepted, 5th Dec., 1891
PROVISIONAL SPECIFICATION.
Improvements in Sewing Machines.
We, ALEXANDER ANDERSON, Manager, and ROBERT ANDREW FERGUSON
POLLOCK, Mechanic, both of The Singer Manufacturing Company's Works,
Kilbowie, in the County of Dumbarton, do hereby declare the nature of this inven-
tion to be as follows
This invention relates to sewing machines more especially of the class in which a
rotary oscillating or vibrating shuttle or looper is employed and it has for its object
the provision of a device under the bed plate for carrying the thread out of the way
and to the proper side of the needle, notwithstanding any movement of the goods
upon the work plate, so that the point of the shuttle or looper will engage the
proper thread loop on the descent of the needle and form a stitch instead of, as
frequently occurs, forming a knot upon the thread.
The improved device consists of a finger or looper formed or fitted on the end of
a rod or bar to which a reciprocating or oscillating motion is imparted from the
main or other shaft of the machine in such wise that the said finger or looper is
traversed across the path of the needle as the latter rises out of the throat plate
and after engaging the shuttle thread returns with it as the needle descends the
looper dragging, the thread out of the way of the descending needle so that it does
not interfere with the formation of the stitch.
The requisite movement may be imparted to the finger or looper in various ways.
In one arrangement the finger is formed or mounted on a horizontal rod or bar the
end of which is acted on in one direction by a cam on the main or shuttle driving
shaft whilst a spring serves to traverse the looper bar in the opposite direction; or
a grooved cam or fork may be employed to give positive motion to the bar in both
directions. In another arrangement a cam surface on the back of the shuttle driver
acts on a bell crank or other lever on a rock shaft having a lever arm carrying the
looper which in this case has an oscillating or vibrating motion imparted to it.
In still another arrangement the looper bar has formed on it a wedge or inclined
cam piece against which an arm on a rock shaft bears and vibrates to impart.
the proper reciprocating movement to the finger or looper bar.
Dated this Sixth day of April 1891.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents
COMPLETE SPECIFICATION.
Improvements in Sewing Machines.
We, ALEXANDER ANDERSON Manager and ROBERT ANDREW FERGUSON
POLLOCK, Mechanic, both of The Singer Manufacturing Company's Works
Kilbowie in the County of Dumbarton do hereby declare the nature of this inven-
tion 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 sewing machines more especially of the class in which a
rotary oscillating or vibrating shuttle or looper is employed and it has for its object
the provision of a device under the bed plate for carrying the shuttle thread out of
the way and to the proper side of the needle, notwithstanding any movement of the
goods upon the work plate so that the point of the shuttle or looper will engage the
proper thread loop on the descent of the needle and form a stitch instead of, as
frequently occurs, forming a knot upon the thread.

page_text: In the accompanying drawings which illustrate the invention
Figure 1 is a sectional side elevation and Figure 2 an inverted plan of part of a
sewing machine showing one modification of the improved device whilst Figures 3
& 4, 5 & 6, and 7 & 8 are similar views showing other modifications of the invention.
The improved device consists of a finger, looper or spreader a formed or fitted on
the end of a rod or bar A to which a reciprocating or oscillating motion is imparted
from the main or other shaft B of the machine in such wise that the said finger or
looper is traversed across the path of the needle C as the latter rises out of the
throat plate D and after engaging the shuttle thread returns with it as the needle
descends the looper or spreader dragging the thread out of the way of the descending
needle so that it does not interfere with the formation of the stitch.
The requisite movement may be imparted to the finger, looper or spreader in
various ways.
In one arrangement as represented at Figures 1 and 2 the finger a
is formed or mounted on a horizontal rod or bar A the end or an arm A¹ on which
is acted on in one direction by a cam F on the main or shuttle driving shaft B
whilst a spring G serves to traverse the looper or spreader bar A in the opposite
direction; or a grooved cam or fork may be employed to give positive motion to
the bar A in both directions. In another arrangement as represented at Figures 3
and 4 a cam surface F on the back or boss of the shuttle driver H acts on a bell
crank or other lever 1 on a rock shaft or pin J carried in brackets fixed to the
back of the shuttle race said lever having an upwardly extending arm K carrying
the looper or spreader a which in this case has an oscillating or vibrating motion
imparted to it.
In the modification illustrated in Figures 5 and 6 the looper bar A. on which the
looper or spreader a is formed is attached at one end to a lever arm L pivotted on
a shaft M carried on brackets on each side of the main driving shaft B. The lever
arm L carries a roller upon which a cam Fou the main driving shaft acts to give
the necessary motion in one direction whilst a spring G attached to the other end
of the looper bar A acts to return the looper or spreader a to its normal position.
In a further modification shewn by Figures 7 and 8 of the drawings the looper
bar A is pivotted on the throat plate of the machine and at one end of it the looper
or spreader a is formed whilst the other end is bent to bring it in contact with a
cam F fixed or formed on the back or boss of the shuttle driver H. The cam F
acts on the downwardly extending portion K to give motion in one direction whilst
a spring G attached to the part K acts to bring back the looper to its normal
position.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
In a sewing machine a looper or spreader constructed and arranged to operate
substantially as herein before described under the several modifications illustrated
in the accompanying drawings.
Dated this Third day of November 1801
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.