Improvements in and relating to Loopers for Sewing Machines.
Year: 1891

page_text: Date of Application, 21st July, 1891-Accepted, 5th Sept., 1891
COMPLETE SPECIFICATION.
Improvements in and relating to Loopers for Sewing Machines.
We, JOHN WILLIAM RICKS, residing at No. 170 West Fulton Street,
Machinist, HENRY SALEM SHAFT, residing at No. 28 Washington Street,
Machinist, and HARLAN PAGE SHUTTS, residing at No. 25 West Fulton
Street, Merchant, in the City of Gloversville, County of Fulton and State of New
York, one of the United States of America, Citizens of the said United States of
America, 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 :-
Our invention relates to that class of sewing machines which form a lock-stitch
through the co-operation of a revolving hook and under thread, and reciprocating-
needle and upper thread.
The invention consists in a revolving hook constructed and arranged substantially
as we will proceed now more particularly to point out and finally claim.
In the accompanying drawings illustrating our invention, in the several figures
of which like parts are similarly designated -
Figure 1 is an elevation showing a sewing machine cloth and throat plate in
section and also showing in elevation the presser-foot and a part of its bar, and the
needle and a part of its bar.
Figure 2 is an elevation of the bobbin-holder detached.
Figure 3 is a plan of the bobbin-holder.
Figure 4 is a side elevation, and Figure 5 a plan of the bobbin case and
bobbin.
Figures 6 and 7 show in different elevations the revolving hook.
Figure 8 is a section like Figure 1, with the hook,, broken away to show the
barbs in engagement with the loop of needle thread and also showing, in dotted
lines, the position of parts when the loop is discharged from the hooks.
In the drawings, a, is the cloth-plate, b, is the throat-plate, c, is the presser-foot,
d, the presser bar, e, the needle, f, the needle-bar, g, the needle or upper-thread,
and h, the bobbin or under-thread, all substantially of usual or approved con-
struction and arrangement.
The bobbin holder we prefer to use is constructed with a flange, i, by which it
may be screwed to the cloth-plate; and an arm, j, projects obliquely from this
flange and is made with an elbow, k, which terminates in a ring, l. A second
which engages
ring, m, is hinged at, m³, to the arm, j, and this ring has a block, m²,
a spring, n, under stress so as to be held in whatever position it may be given.
The spring, n, is secured to the arm, j. The rings, l, and m, are counterparts, and
when brought into parallel they are adapted to retain the bobbin case, o, and its
contained bobbin p, and allow necessary freedom of motion to the bobbin-case while
at the same time rendering access to and removal of the bobbin-case at all times
easy. The bobbin-case has the tension, spring, o¹, and thread eye, o³, and the said
case is of circular outline with its rim V-shaped, the rings, l, and m, being corre-
and the
spondingly bevelled to receive it. The bobbin is supplied with an eye,
bobbin-case with a post, o³, which enters and engages the bobbin eye, p¹, to secure
the bobbin in the case and permit the bobbin to revolve freely within its case.
insert the bobbin-case in the bobbin-holder, the ring, m, is turned upon its hinge as
indicated in dotted lines in Figures 2 and 3, and then the bobbin-case is laid upon
the ring, 1, and afterwards the ring, m, turned down into the full line position
shown in said figures.
To
The revolving-hook comprises a collar, y, adapted to be applied to the shaft of
the sewing machine as by screw, q'. This collar is supplied with the disc-face, r,

page_text: which latter has the flange, r. A hook, s, projects laterally from this flange and
then extends substantially parallel with it, and may be secured thereto by a screw, s.
A hook, t, also projects laterally from the flange and then extends substantially
parallel with it, the barbs of the two hooks being in juxtaposition but separated by
a channel, and the point of hook, s, being free while the point of hook, t, is buried
in the flange. The hook, t, may be secured to the flange by a screw, t'. The
hook, t, is arranged between the collar and the hook, s.
The relative arrangement of the revolving-hook and the bobbin-holder and
bobbin-case and bobbin is shown in Figure 1, and needs no further description
excepting the suggestion that the hook revolves around the bobbin-case in its
holder.
In the operation of our invention, the loop of the needle-thread is caught by the
barbs of the hooks, s, and t, and the loop sliding back over the points of both hooks,
is spread sufficiently to pass over the bobbin-case and is then carried around to the
centre and released through the channel between the barbs of the hooks, the
bobbin-thread meanwhile being engaged, and the needle thread drawn up in usual
manner and by usual means to complete the lock-stitch.
By our invention a shuttle and its appurtenances are dispensed with, the soiling
of the thread by oil is prevented, and a strong and simple lock-stitch formed.
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 :-
-
1. In a sewing machine, a revolving hook composed of a collar having a flange
and two substantially parallel hooks applied to such flange, one having a free
point and the other a concealed point, and barbs on the hooks which lie close
together and have an intervening channel, substantially as described.
2. In a sewing machine, a revolving hook composed of a collar and two substan-
tially parallel hooks, one having a free point and the other a concealed point, and
barbs on the hooks which lie close together and have an intervening channel,
substantially as described.
Dated this 21st day of Jul. 1901
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.