Improvements in Sewing Machine Shuttles.
Year: 1887

page_text: Date of Application, 29th Dec., 1887
Complete Specification Left, 27th Aug., 1888
Complete Specification Accepted, 28th Sept.. 1888
TRUY DIONA DOLIN
Improvements in Sewing Machine Shuttles.
1, ALEXANDER ANDERSON, Manager of The Singer Manufacturing Company's
Works, Kilbowie, Dumbartonshire, do hereby declare the nature of this invention (a
communication to me from abroad by The Singer Manufacturing Company of New
York, in the United States of America, Sewing Machine Manufacturers) to be as
follows:-
The object of my invention is to provide a sewing machine shuttle of such
construction that it is adapted to carry a large amount of thread in proportion to the
size of loop required for it to pass through, as well as a shuttle which will be very
convenient for use and easily threaded, my invention being more particularly designed
as an improvement on that class of shuttles which are segmental in form and which,
in operation have an oscillating or rotary movement.
In carrying my invention into effect I provide the frame or body of the shuttle with
a bobbin-case which is preferably cylindrical in form, open at its rear end and
pivoted at its forward end to said frame or body. In the preferred form of my
invention the said bobbin-case has an open-ended threading slot leading into a thread-
delivery hole, the latter being beneath a tension spring secured to the outer side of the
case. The bobbin-case being pivoted to the body of the shuttle is thus adapted to be
swung aside for the insertion or removal of the bobbin, and when returned to its
operative position is held in place by a spring catch. The bobbin case is arranged
lengthwise of the segmental frame, rim or body of the shuttle or in other words in
such a manner as to form or partly form a chord of an arc of the circle of which the
said rim or body is a segment.
The bobbin-case is preferably made of cylindrical form with a tapered or pointed
forward end at which part it is secured to the frame or body of the shuttle by a pivot-
pin so that it may be swung outward, for the insertion or removal of the bobbin, said
case being open at its rear end for this purpose. If desired, however, the hobbin-case
may be pivoted to the frame or body at or near its centre.

page_text: To hold the pivoted bobbin-case in its operative position I provide a spring or spring
catch secured in a recess in the inner side of the shutile frame the free end of said
spring engaging said case by a slight recess in the latter, said free end entering a hole
in the said frame to prevent the lateral displacement of the spring by the friction of
the bobbin-case against the same. The bobbin-case is provided at its rear end with a
shoulder which, when the said case is swung into operative position, comes into
contact with a heel-piece or arm on the shuttle frame, the said shoulder thus forming
a stop for the said case.
A tension spring is secured to the outer side of the bobbin-case by an
attaching and
adjusting screw, and a threading-slot, preferably open at its rear end, leads into a
thread-delivery hole beneath the tension spring. In one form of my invention the
slot is outside of the tension spring and extends forward nearly or quite to the front
end of the bobbin chamber, running thence diagonally rearward into the thread
delivery hole, the tension spring having a thread finger the point of which enters a
slight recess in the bobbin-case, but in another form of my invention the threading
slot is entirely beneath the tension spring and is straight, and the delivery hole into
which the said slot opens is about midway, lengthwise, of the bobbin chamber. Also
in this latter form of my invention the tension spring, overlying the threading slot
and delivery hole, has an inclined rear end to guide the thread into a holding notch
formed in an inwardly turned lip entering a slot in the bobbin-case. With this con-
struction the shuttle is threaded very easily by a single slight pull on the thread to
draw the latter along the threading slot and into the delivery hole, and the holding
notch, the latter securely preventing the escape of the thread from beneath the tension
spring.
The pivot-pin by which the bobbin-case is attached to the shuttle frame or body
may be easily driven out to permit of the removal of the case from said body when,
for any reason, it is desired to detach these parts, as when the said frame or body, (on
which most of the wear comes) is worn out, so that it becomes necessary to renew it,
or when it may be desirable, owing to the class of work being performed, to substitute
a bobbin-case different in its construction, or having a different form of tension spring,
for the bobbin-case formerly in use.
The bobbin-case may, however, be rendered detachable from the shuttle frame or
body the said case being provided with a pointed nose entering a recess in the said
frame, the rear arm on the latter being made very light so that it will spring to allow
the said case to be snapped into operative position, said arm thus serving as a spring
catch to hold the bobbin-case in place.
The tapered or pointed forward end of the bobbin-case serves as a spreader to carry
the loops of needle thread over the said case, this construction permitting of the use
of a comparatively large bobbin-case with a narrow segmental shuttle frame or body
to run in the shuttle-race, so that a bobbin capable of carrying a large amount of
thread may be used in a shuttle not requiring a very large loop of needle thread for it
to pass through.
Dated this Twenty eighth day of December 1887.

page_text: Improvements in Sewing Machine Shuttles..
I, ALEXANDER ANDERSON, Manager of the Singer Manufacturing Company's
Works, Kilbowie, Dumbartonshire, do hereby declare the nature of this invention
and in what manner the same is to be performed, as communicated to me to be
particularly described and ascertained in and by the following statement :—
The object of my invention is to provide a sewing machine shuttle of such
construction that it is adapted to carry a large amount of thread in proportion to the
size of loop required for it to pass through, as well as a shuttle which will be very
convenient for use and easily threaded my invention being more particularly designed
as an improvement on that class of shuttles which are segmental in form and which
in operation have an oscillating or rotary movement.
In carrying my invention into effect provide the frame or body of the shuttle
with a bobbin case, which is preferably cylindrical in form, open at its rear end, and
pivoted at its forward end to said frame or body. In the preferred form of my
invention the said bobbin case has an open ended threading slot leading into a thread
delivery hole, the latter being beneath a tension spring secured to the outer side of
the case.
The bobbin case being pivoted to the body of the shuttle is thus adapted
io be swung aside for the insertion or removal of the bobbin, and when returned to
its operative position is held in place by a spring catch. The bobbin case is arranged
lengthwise of the segmental frame, rim or body of the shuttle, or in other words, in
such a manner as to form or partly form a chord of an are of the circle of which the
said rim or body is a segment.
In order that my invention may be fully understood by those skilled in the art to
which it relates, I will fully describe the same in connection with the accompanying
drawings in which
Figure 1 is a side view of one form of my invention and Figs. 2 and 3 plan views
of the same with the beak in section. Fig. 4 is an end view and Figs. 5 and 6
are sectional views of the same. Fig. 7 is a plan view, with the beak in section, of a
slightly different form of my invention from that shown in the preceding figures; and
Figure 8 is a similar view of the same with the tension spring removed. Fig. 9 is a
side view, partly broken out, of still another form of my invention; and Fig. 10 is a
cross section of the tension spring shown in Fig. 7 on the line 10 - 10 in the
latter figure.
A denotes the frame or body of the shuttle and B the bobbin case the latter being
preferably cylindrical in form with a tapered or pointed forward end at which part it
is secured to the frame or body A by a pivot pin a so that it may be swung outward
as shown in Fig. 3 for the insertion or removal of the bobbin, said case being open
at its rear end for this purpose. If desired, however, the bobbin case may be pivoted
to the frame or body A at or near its centre.
To hold the pivoted bobbin case in its operative position, I provide a spring or
spring catch c secured in a recess d in the inner side of the frame A the
free end of said spring engaging said case by a slight recess at e in the latter, said

page_text: free end entering a hole in the said frame to prevent the lateral displacement of the
spring by the friction of the bobbin case against the same. The bobbin case is
provided at its rear end with a shoulder, which when the said case is swung into
operative position, comes into contact with the heel piece or arm / on the shuttle
frame A, the said shoulder thus forming a stop for the said case.
Cis the tension spring, secured to the outer side of the bobbin case by an attaching
and adjusting screw i, and j is a threading slot preferably open at its rear end, as
In
shown, said slot leading into a thread delivery hole & beneath the tension spring.
the form of my invention shown in Figs. 1, 2, and 3 the slot is outside of the tension
spring and extends forward nearly or quite to the front end of the bobbin chamber,
running thence diagonally rearward into the thread delivery hole, the tension spring
having a thread finger, the point of which enters a slight recess in the bobbin case;
but in the form of my invention shown in Figs. 7 and 8 the threading slot is entirely
beneath the tension spring and is straight and the delivery hole into which the said
Also in this latter
slot opens is about midway lengthwise of the bobbin chamber.
form of my invention the tension spring overlying the threading slot and delivery
hole has an inclined rear end to guide the thread into a holding notch n formed in an
inwardly turned lip m entering a slot, o, in the bobbin case. With this construction the
shuttle is threaded very easily by a single slight pull on the thread to draw the latter
along the threading slot and into the delivery hole and the holding notch the latter
securely preventing the escape of the thread from beneath the tension spring.
The pivot pin a by which the bobbin case is attached to the shuttle frame or body,
may be easily driven out to permit of the removal of the case from said body when
for any reason it is desired to detach these parts, as when the said frame or body (on
which most of the wear comes) is worn out, so that it becomes necessary to renew it,
or when it may be desirable, owing to the class of work being performed, to substitute
a bobbin case different in its construction or having a different form of tension spring,
for the bobbin case formerly in use. The bobbin case may, however, be rendered
detachable from the shuttle frame or body by constructing these parts as shown in
Fig. 9 in which the said case is represented as being provided with a pointed nose p
entering a recess in the said frame, the rear arm d on the latter being made very light,
so that it will spring to allow the said case to be snapped into operative position, said
arm thus serving as a spring catch to hold the bobbin case in place.
The tapered or pointed forward end of the bobbin case serves as a spreader to carry
the loops of needle thread over the said case, this construction permitting of the use
of a comparatively large bobbin case with a narrow segmental shuttle frame or body
to run in the shuttle race, so that a bobbin capable of carrying a large amount of
thread may be used in a shuttle not requiring a very large loop of needle thread for
it to pass through.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed declare that what I
claim is
1. In a sewing machine shuttle the combination with a segmental rim or body, of
an independent cylindrical bobbin case attached to the said rim or body and arranged
lengthwise thereof, or so as to form a chord of an arc of the circle of which the
said rim or body is a segment, the said bobbin case being tapered or pointed at its
forward end for easy passage through the loops of needle thread and open at its rear
end for the insertion of a bobbin substantially as set forth.
2. In a sewing machine shuttle the combination, with a segmental rim or body, of
a cylindrical bobbin case detachably secured to the said rim or body and arranged
lengthwise thereof, or so as io form a chord of an arc of the circle of which the
said rim or body is a segment substantially as set forth.
3. A sewing-machine shuttle having a cylindrical and detachable bobbin case which
is tapered or pointed at its forward end for easy passage through the loops of
needle thread and open at its rear end for the insertion of the bobbin, combined with
a spring catch to assist in retaining the said case in the rim or body of the shuttle.

page_text: 4. A sewing machine shuttle having a cylindrical bobbin case which tapered or
pointed at its forward end and open at its rear end, the said bobbin case being
pivoted at its forward or tapered end to the rim or body of the shuttle, combined
with a spring catch to hold the free or rear end of the said bobbin case in operativo
position.
5. A sewing machine shuttle rim or body and a cylindrical bobbin case having a
pointed or tapered forward end, at which it is pivoted to the said rim or body, and an
open rear end for the insertion of the bobbin the said case having also a shoulder or
stop, as g, and the said body having an arm against which the said shoulder or stop
impinges, combined with a spring catch to engage the said bobbin case and retain it
in operative position.
6. The combination, with the shuttle rim or body A, having the recess d, of the
spring catch a secured in said recess, and the cylindrical bobbin case having a tapered
or pointed forward end at which it is pivoted to the said rim or body, said case being
engaged at its rear end to be held in operative position by the free end of the said
spring catch.
7. A sewing machine shuttle having an open ended bobbin case provided with a
thread delivery hole, a threading slot, and a second slot, combined with a tension
spring having a notched inwardly turned lip extending into said second slot, sub-
stantially as set forth.
8. A sewing-machine shuttle having an open ended bobbin case provided with a
thread delivery hole, a threading slot, and a second slot, combined with a tension
spring having a notched inwardly turned lip extending into said second slot and an
inclined rear end, substantially as set forth.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.