Improvements in or relating to Bobbins, specially applicable for Use in the Shuttles of Sewing Machines.
Year: 1895

page_text: Date claimed for Patent under Sect. 100 OF AUT
being date of first Foreign Application (in 17th Oct., 1894
United States of Americ‹),
Date of Application (in United Kingdom), 1st Jan., 1895
Complete Specification Left, 27th Sept., 1895-Accepted, 7th Dec., 1895
United States of Americ‹),
Date of Application (in United Kingdom), 1st Jan., 1895
Complete Specification Left, 27th Sept., 1895-Accepted, 7th Dec., 1895
PROVISIONAL SPECIFICATION.
Improvements in or relating to Bobbins, specially applicable for
Use in the Shuttles of Sewing Machines.
I, SIMON WILLARD WARDWELL, Junior, of No. 40 Rutland Square Boston,
County of Suffolk, State of Massachusetts, United States of America do hereby
declare the nature of this invention to be as follows:-
My invention relates to improvements in bobbins for sewing machine or other
cops and it has for its object to improve the construction to better adapt them for
holding the cop, and overcome objections incident to usual constructions, and my
invention consists in a bobbin having the various features of construction and
arrangement substantially as hereinafter more particularly set forth.
Heretofore, bobbins for sewing machine cops have been so constructed that in
consequence of the varying thickness of the cops, or as a cop was reduced in
diameter from the use of the thread, there would be spaces between the sides of the
cop and the ends of the bobbin, and the thread would slip from the edge of the cop
and get between the side of the cop and the bobbin head, and sometimes wrapped
around the axle and broken. Even where the thread was not broken, the constant
slipping from a position tangential to the periphery of the cop, to a position across
the side or end of the cop, resulted in variations of tension, which produced
defective stitching.
My invention consists in so constructing the parts of the bobbin that there will
be a tendency for the side pieces to approach each other. This result may be
secured by different constructions. For instance 1 construct a bobbin with
separable heads; a stem projects from one head, and has a threaded opening at
the end, the other head having a sleeve around which is curled a spiral spring,
With this is used a cap having a
secured at its inner end to the said other head.
threaded projection adapted to the threaded opening in the stem and a flange
adapted to bear on the spring.
The cops, as usual, have central openings so that a cop can be put on the stem
of one head, the other. head applied and the cap put in place and screwed down,
so that the spring will cause the heads to bear constantly upon the side of
the cop.
In another construction the stem is hollow and encloses a spiral spring bearing
on a lip of the stem and on a shoulder of a knob on a rod extending through the
spring and stem and having a cross bar at the other end. One head of the bobbin
has a slot adapted for the passage of the cross bar. The cop is put on the stem on
ope head; the other head of the bobbin is applied with its slot, coinciding with
the cross bar and the finger is applied to the knob aforesaid, to push in the rod
and lift the cross bar above the slotted head of the bobbin after which the latter
head is turned to bring the slot at right angles to the cross bar. On removing the

page_text: pressure on the knob the spring will draw in the rod and press the cross bar on the
contiguous head and carry the latter against the side of the cop.
A preferred construction is one in which both the heads are preferably slightly
concave towards each other. Que head herein referred to as the first head has a
central orifice, with an inwardly projecting sleeve or bearing, which is tapering
towards its inner extremity, and the opening is also tapering, contracting towards
the inner extremity of the sleeve.
"
The other or second head is also provided with a hollow stem or projection
which is somewhat longer than the sleeve or bearing piece in the first-named head
with which it co-operates, in the manner hereinafter described, and the two form
the axle of the bobbin. This stem is tapering from the outer surface of the second
head towards the centre of the bobbin, for a certain distance, and then expands
outwardly and the end is rounded.
Thus it will be seen that the stem of the second head has an inclined plane at
its outer end, adapted to engage an inclined plane upon the first head. This stem
may be variously formed, but is preferably a cylinder split to form a series of
spring fingers. It may be integral with one of the heads, or made separate and
rivetted to it, and although it is preferable that the stem should have two portions
inclined towards each other, both portions need not necessarily be inclined, but one
may be parallel sides, although when inclined, it furnishes a better support to
centre the cop. The cop put on the stem of the second head, and the end of
the latter is pushed into the sleeve of the first head when the co-acting inclines
will draw the heads together upon the cop. The side pieces of the bobbin can
be readily separated by merely forcing them apart the spring fingers or portions
of the stem collapsing for that purpose.
It will be seen that in cach of the constructions above described, the heads of
the bobbin are automatically drawn toward each other upon the cop, without the
application of any pressure from without the bobbin--as by springs etc. upon the
shuttle so that the bobbins may be used with any kind of shuttle adapted to
receive them, and therefore, that however the cops may vary in thickness, and
whatever may be the reduction in the diameter of the cop as the thread is drawn
therefrom, the heads will always bear upon the sides of the cop at the periphery,
so that it is impossible for the thread to slip from the periphery between the cop
and head at either side.
Dated this 1st day of January 1895.
BOULT & WADE,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Bobbins, specially applicable for
Use in the Shuttles of Sewing Machines.
$
1, SIMON WILLARD WARDWELL Junior of 40 Rutland Square Boston, in the
County of Suffolk, in the State of Massachusetts, 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 :-
My invention relates to bobbins for sewing machine cops, and it has for its object
to improve the construction to better adapt them for holding the cop, and overcome
objections incident to usual constructions, and my invention consists in a bobbin
having the various features of construction and arrangement substantially as
hereinafter more particularly set forth.
In the accompanying drawings
:-
Figure 1 is a side view of the parts of the bobbin separated, with the cop such
as I prefer to use between them;

page_text: Figure 2 is a vertical section through the same;
Figures 3 and 4 are side views of the heads of the bobbin.
Figures 5 and 6 are views illustrating modifications of the bobbin, being sections*
in the axial plane of each, and
Figure 7 is a plan of Figure 6.
All the figures are somewhat enlarged beyond the actual size for the purpose of
clearness.
Heretofore, bobbins for sewing machine cops have been so constructed that in
consequence of the varying thickness of the cops, or as a cop was reduced in
diameter from the use of the thread, there would be spaces between the sides of
the cop and the ends of the bobbin, and the thread would slip from the edge of
the cop and get between the side of the cop and the bobbin head, and sometimes
get wrapped around the axle and broken. Even where the thread was not broken,
the constant slipping from a position tangential to the periphery of the cop, to a
position across the side or end of the cop, resulted in variations of tension, which
produced defective stitching.
My invention consists in so constructing the parts of the bobbin that there will
be a tendency for the side pieces to approach each other. This result may be
secured by different constructions. Thus, in Figure 5, A B are the separable
heads of the bobbin; 6 a stem projecting from the head B, and having a threaded
opening at the end, the head A. having a sleeve c around which is curled a spiral
spring c¹, secured at its inner end to the head A, D is a cap having a threaded
stem e adapted to the threaded opening and a flauge f adapted to bear on the
spring c.
a
g
The cops, as usual, have central openings so that a cop can be put on the stem 61
the bead A can then be applied and the cap D put in place and screwed down, so
that the spring c¹ will cause the cap A to bear constantly upon the side of the cop.
In the construction shown in Figures 6 and 7, the stem is hollow and encloses
a spiral spring e 2 bearing on a lip i and on a shoulder of a head n on a rod
extending through the spring and having a cross bar h at the other end. The
head A has a slot y adapted for the passage of the cross bar, and is adapted to
slide for a small distance on the stem 61. "The cop is put upon the stem bl; the
head A is applied with its slot y coinciding with the cross bar h, and the finger is
applied to the head n to push in the rod g and lift the cross bar above the head A,
after which the latter is turned to bring the slot y at right angles to the cross bar.
On removing the pressure on the head in the spring e 2 will draw in the rod g and
press the cross bar on the head A and carry the latter against the side of the cop.
My preferred construction is illustrated in Figures 1 to 4 in which both the
heads A B are preferably slightly concave towards each other, as shown. The
head A has a central orifice a with an inwardly projecting sleeve or bearing a
which is tapering towards its inner extremity and the opening a is also tapering
contracting towards the inner extremity of the sleeve.
The head B is also provided with a hollow stem or projection 6 which is some-
what longer than the sleeve or bearing piece a' with which it co-operates, in the
manner hereinafter described, and the two form the axle of the bobbin. This
stem at 62 is tapering from the outer surface of the head B towards the centre of
the bobbin, for a certain distance, and then expands outwardly at 63 and the end 6 4
is rounded.
Thus it will be seen that the stem has an inclined plane at its outer end, adapted
to engage an inclined plane upon the head A. This stem b¹ may be variously
formed, but is preferably a cylinder or double cone split to form a series of spring
fingers. It may be integral with one of the heads, or made separate and rivetted
to it, and although it is preferable that the stem should have two portions inclined
towards each other, the portion 62 need not necessarily be inclined, but may have
5 parallel sides, although when inclined, it furnishes a better support to centre the
cop. The cop is put on the stern 6 and the end of the latter is pushed into the
sleeve a¹ as shown in Figure 2 when the co-acting inclines will draw the heads

page_text: together upon the cap. The side pieces of the bobbin can be readily separated by
merely forcing them apart, the spring fingers or portions of the stem collapsing
for that purpose.
It will be seen that in each of the constructions above described, the heads of
the bobbin are automatically drawn toward each other upon the cop, without the
application of any pressure from without the bobbin-as by springs etc. upon the
shuttle so that the bobbins may be used with any kind of shuttle adapted to
receive them, and therefore, that however the cops may vary in thickness, and
whatever may be the reduction in the diameter of the cop as the thread is drawn
therefrom, the heads will always bear upon the sides of the cop at the periphery
so that it is impossible for the thread to slip from the periphery between the cop
and head at either side.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, without limiting myself
to the construction shown, I declare that what I claim is :-
1. A bobbin comprising two heads and a connection between the heads arranged
to draw the heads together automatically, substantially as described.
2. A bobbin comprising the heads having inward projections provided with
contracting inclined faces, whereby the heads are drawn together automatically
substantially as described.
3. A bobbin comprising the heads the one having a sleeve with an inclined surface
and the other having a stem with an inclined surface all arranged to automatically
maintain the heads against the sides of the cop substantially as described.
4. A bobbin consisting of a head having a tapering sleeve and a head having a
stem consisting of spring fingers with a tapering bearing adapted to co-operate
with the tapering collar and draw the side pieces towards each other substantially
.as described.
5. The head B with a stem slotted to form spring fingers with free ends and
adapted to an inclined bearing on the head A. as shown and described.
6. A bobbin comprising two heads A and B and connections arranged to draw
the heads together automatically substantially as and for the purpose hereinbefore
described and illustrated in Figure 5 or Figures 6 and 7 of the accompanying
drawings.
Dated this 27th day of September 1895.
BOULT & WADE,
Agents for the Applicant.