Year: 1886

page_text: I, FREDERICK NESFIELD COOKSON, of Eva Villa, Waterloo Road, Wolverhampton,
in the County of Staffordshire, Manufacturer, 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 introduction of an improved construction of sewing
machine, and is more particularly applicable to low-priced, small, and portable
band-machines, although it is not necessarily confined to them.
It consists in an improved method of actuating the shuttle with an intermittent
motion from a crosshead having a regular reciprocating motion.
In order that my invention and the means by which it can be carried into
practical effect may be thoroughly understood, I will now proceed to describe the
same in detail, referring in so doing to the accompanying figures which are to be
taken as part of this specification and read therewith, and in which like parts are
marked throughout the figures with the same reference letter.
I wish to point out that the figures illustrate my invention as applied to a small
hand-machine, and although this is the style of machine to which the invention is more
particularly applicable, and with the greatest advantage, I would have it distinctly
understood that I do not confine myself to the general construction of machine
illustrated, inasmuch as this can be varied in different directions without departing
from the essential parts of my invention.
Fig. 1 is a side elevation, the crank being a few degrees past the dead point and
the needle descending.
Fig. 2 is a front elevation.
Fig. 3 is an elevation illustrating the link gear from the crosshead to the stud of
the bell crank.
A is a standard forming the frame of the machine.
Two horns a, a', parallel with each other project from the lower part, and, with
the set screw B, form a suitable cramp by which the machine can be fastened to
the edge of a table.
C is the cloth plate, and D a bracket to carry the top spool.
E is the first motion wheel, carried on an axis projecting from the back of the
standard, and gearing with the pinion "F, the axis of which works in a bearing

page_text: upon the top of the standard A, and is geared to the crosshead G by means of a
half crank, g, and connecting rod, g¹.
H is the needle carried by the crosshead.
I is the top spool, its thread being led through any tension device suitable for
the purpose.
J is the shuttle carried in a basket K. These parts may be of any suitable and
well-known type.
The shuttle basket is carried at the outer extremity of the longer arm, l, of a
bell crank lever having its axis, 12, in the lower part of the standard A. The
stroke of the basket is, therefore, an arc of a circle, but, if preferred, it may be
made rectilinear by the introduction of any suitable mechanical arrangement
introduced for that purpose into the longer arm of the bell crank under the
shuttle.
The crosshead G works in a slot, m, in the standard A, and has a link, n, fixed
rigidly to it. This link is loosely connected to a second link, n¹, by means of a
slot, n², and screw, n³, or other equivalent device. The link, n¹, travels between
suitable guides formed in the back of the standard. The length of the slot, n³, is
equal to three quarters the length of stroke of the needle. A second slot, n, is
formed in the lower end of the link, n¹, to receive a stud, o, projecting into it from
the extremity of the shorter arm, A, of the bell crank.
A quadrantal slot, o¹, is formed in the standard, in which the stud, o, can work.
The operation of the above described mechanism, for the purpose of actuating
the shuttle, is as follows.
. Both needle H and top link, n, descend together; but, in consequence of the
slot n in the link, n, the shuttle is not moved until the top of the slot, n³,
contacts with the pin, n³, when the shorter arm, l, of the. bell crank is depressed;
and the shuttle thrown with a stroke accelerated by the greater length of the arm
of the bell crank.
When the link, n, commences to rise after it has reached the bottom of its
stroke, the shuttle remains stationary until the bottom edge of the slot, n³, contacts
again with the pin, n³, when the shuttle will be thrown back again.
The needle is thus caused to complete its downstroke and commence its upstroke,
paying out slack by the latter motion, and the shuttle thrown and returned before
the needle is too far on its upstroke for the proper production of the stitch.
P is a plate in front of the shuttle race, capable of sliding in grooves formed in
the underside of the cloth plate C and in a bar, p, provided for this purpose.
The needle groove, p¹, is formed in the inner face of the plate P.
Qis the cloth presser and traverser, the spindle, q, of which works loosely through
two eyes r,, the latter larger than the former; and is kept down by a spring,
As the crosshead G rises, a small stud, s, upon it strikes against a second stud, st,
projecting from the top of the spindle, q, and raises it until the roundness or taper
of the noses of the studs allows that on the spindle, q, to slip off, the traverser
being moved thereby, (to the right hand in Fig. 1), preparatory to taking a fresh
"bite" of the cloth. The spring, r³, forces the traverser into the cloth and a small
blade spring, ³, within the lower and larger eye, r, returns the traverser which,
accordingly, moves the material the length of one stitch.
Figs. 4 and 5 are, respectively, illustrations of alternative constructions showing
how my invention can be varied in its details without departing from its distinctive
features,
In Fig. 4, the bell crank and lower link, n, of Figs. 1, 2, and 3, are replaced,
respectively, by a toothed quadrant T and a rack, t. The rack, t, and top link, n,
may be made in one piece, the intermittency of motion on the part of the
quadrant being obtained by the omission of the necessary number of teeth from
either quadrant or rack.
In Fig. 5, the lower link, n¹, is replaced by a bell crank lever, U, having its
axis in the standard at u. The arms of this lever are of equal length, so as to
avoid readjustment of the relative lengths of the arms l, l, of the bell crank which

page_text: carries the shuttle. A stud, u³, at the extremity of the upper arm enters the slot, no,
which is a modification of the slot, n², of Fig. 3, while the lower arm connects with
the bell crank 1, 1, on the other side of the standard by receiving the stud, o, in a
slot of the proper radius.
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 sewing machine, the combination of two links, (the upper one of which
is driven at the same rate throughout its stroke as the needle, and the connection
between which two links permits of the lower one remaining stationary for as long
as the shuttle may be required to be at rest), with a bell crank, the longer arm of
which carries the shuttle, which bell crank is actuated by having its shorter arm
connected to the lower of the two links; substantially as and for the purposes
described with reference to the accompanying figures.
2. In a sewing machine, the combination of a toothed quadrant carrying the
shuttle with a rack gearing therewith, and which receives a reciprocating linear
motion the same as that of the needle, some teeth being omitted from the gear or
a top link n and slot connection being used for the purpose of producing the
intermittency of motion necessary to the shuttle, substantially as and for the
purpose described with reference to the accompanying figures.
3. In a sewing machine, the combination with a reciprocating crosshead, to
which the needle is fixed, of a link having a corresponding motion, and connected
by a bell-crank to the short arm of the bell-crank the long arm of which carries
the shuttle, the intermittency of motion on the part of which shuttle is secured by
making the connection between the top link and its bell-crank by means of a stud
and slot; substantially as and for the purpose described with reference to the
accompanying drawings.