Improvements in Rotary Shuttle Sewing Machines.
Year: 1892

page_text: Improvements in Rotary Shuttle Sewing Machines.
I ISRAEL LYONS of 162 Brunswick Buildings Goulston Street Aldgate London
in the County of Middlesex Tailors' Machinist 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 relates to the ordinary form of rotary shuttle sewing machines,
one of which is shewn in the accompanying drawings, in connection with my
improvements, and additions thereto. And the object of my invention is to make
two parallel and independent rows of stitching at one operation, and of any required
distance apart, such as are required for a double stitched edge of a coat, or a
double stitched lap-seam, and also applicable to the forming of two rows of stitching
at the same time in the operation of quilting &c. thereby effecting a large saving
of time, by means of an additional needle, presser-foot, and shuttle carried in a
sliding shuttle box.
And in order that my invention may be fully understood and readily carried
into effect, I will describe the accompanying five sheets of drawings, reference
being had to the figures and letters marked thereon.
Fig. 1 represents a front elevation,
Fig. 2 an end view,
Fig. 3 a view of the lower part of the machine, looking from beneath, and
Fig. 4 a section of the end of machine at dotted line 4-4 shewn in Figure 2.
Figures 5 to 22 are views of certain details.
Similar letters refer to similar parts throughout the several views.
In the drawings letter A represents the ordinary needle-holder, and B the
supplementary one, the latter being attached to a sliding bar a, working in a slot
in the needle-bar b, and fixed at any required distance by means of the set screw Z.
C. represents the ordinary presser-foot, and D, the supplementary one, which is
attached to a bar W, working in the boss C which is itself attached to a sliding
bar d, which works in a slot in the presser bar e, and is held in position by means
of the set screw at back marked Y, and shewn in Figures 10 and 11. This
supplementary presser is furnished with a spring so as to enable it to rise to suit
varying thicknesses of material being sewn, and I prefer to make this spring of
about two-thirds the strength of the spring which actuates the ordinary presser-
foot C, in the usual manner; and I also use the milled-edge nut X, working upon
a screw, as a means of altering the pressure of this spring when required. The
small cross-pin f, prevents this presser-foot from falling too low when taken off the
material being worked upon, and I prefer this pin to be so placed that the normal
position of the supplementary presser-foot D shall be about of an inch lower
than that of the other. E', is the ordinary rotary shuttle, and E, the shuttle box,
and F the supplementary shuttle, and F, the shuttle box. These shuttles E¹,
and F1, are made to work in opposite directions, as shewn by the arrows, and are
timed to form the two stitches at the same instant.
The shuttle box F, is arranged to work in slides R and can be set to suit the
distance at which the needles are required to be apart by means of the screw O,
and milled nut and collar.
Motion is given to the shuttle F1 by means of a pair of mitre-wheels H, and L,
which are driven by the same shaft M, that drives the ordinary pair of mitre-
wheels G, and K, in the usual manner; but as it is necessary that the wheel H,
should shift its position as the sliding shuttle-box F, is shifted, it has a groove cut
in its box in which the plate S, attached to that box, fits, and is left free to move
D017

page_text: upon the driving shaft M, longitudinally, being driven by means of a screw-ping,
working in a slot h, in the driving shaft. These parts being shewn in detail in
Figures 18, 17, and 20, on a larger scale.
The work is fed by means of a feeder i, attached to a feeder bar j, (shewn in
detail in Figure 21). This feeder-bar is lifted by the cam I, and driven forward
by the cam J, which are both attached to the driving shaft M. The cam J, also
carries the feeder-bar down in readiness for the spring S³, to give the return
motion. The travel of the feeder-bar j, and consequently the size of the stitch,
can be regulated by means of the movable stop Q, which can be adjusted by means
of the screw P, and milled-edge nut. The thread is supplied from two reels upon
the top of the machine, and each thread is conducted between a pair of tension-
washers shewn at U, both pairs of tension-washers being upon the same pin and
held by the spring & screw U. Then each thread between a pair shewn at T,
both pairs of which are on the same pin and capable of being regulated by the
spring screw & milled-edge nut T³. Then under a double slack-thread spring k,
then each thread through a separate hole in thread lever V, then through a double
thread-guard, then through the needle-guards m and m' respectively to the
needles. The one thread is shewn in the drawing by a series of dots, and the other
thread by a series of short dashes.
Figure 22 shews an enlarged view of double thread-guard 1, attached to the face
of the machine and so formed that one thread shall pass between it and the face of
the machine and the other thread through the hole marked ", thereby keeping the
threads apart and in their proper place.
Figure 5, shews a portion of the machine with cover-plates removed;
Figure 6 the same with cover plates in position. The cover-plate n, is of the
ordinary form; the cover-plate o, has a slot in it y, to allow for the adjustment of
the needle, and underneath this is a small needle-plate r, fixed to the sliding shuttle-
box F, as shewn at r, Figure 8. The needle-plate p, for the ordinary needle, is
fixed to the bed of the machine by two screws as shewn.
Figures 13 and 14 shew an enlarged view of right, and left, handed shuttles E¹ F¹.
Figures 15, and 16 are separate views of cams J and I.
Figure 19 shews an enlarged view of needle guards m and m³, one of which is
screwed to each needle-holder on one side by means of a small screw (not shewn)
through the eye m², and serves to keep the thread in position between the bends &¹
and s, which bends should press upon the needle holder but yet the whole guard
must be made sufficiently light to spring enough to allow a new thread to be
introduced when required.
Although this form of guard is suitable for both needle-holders, it is especially
requisite for the supplementary one.
The machine as herein described, for double stitching, can be quickly altered, to
do the work of the ordinary single needle machine, by removing the supplementary
needle-holder, presser foot holder, and taking the shuttle out of the sliding shuttle
box, and can be quickly replaced in the original form.
Having now, particularly described and ascertained the nature of my said.
invention, and in what manner the same is to be performed, I declare that what.
I claim is,
1. In a rotary-shuttle sewing machine the use of a supplementary needle, having
means of adjustment for width of stitching.
2. The use of a supplementary adjustable presser-foot.
3. The use of a sliding shuttle-box carrying a supplementary shuttle, and the
means of driving the same.
4. The use of the improved needle-guards.
5. The use of the improved thread guard, carrying two threads.
6. The use of the improved feed and feed motion and the means of adjusting the
same.
7. The use of a double slack thread enrince

page_text: 8. The use of two pair of tension-washers, working on the same pin, and regu-
lated by the same spring & nut, one pair being for each thread.
9. The use of a thread lever, having two holes one for each thread.
10. The construction, combination, and arrangements of parts forming the
improved rotary-shuttle sewing machines, substantially as described and as
illustrated in so far as they are especially applicable to the formation of two
separate rows of stitching simultaneously.
Dated this 9th of Angust 1895