Improvements in Bobbin Cases for Sewing Machine Shuttles
Year: 1898

page_text: [Communicated from abroad by THE SINGER MANUFACTURING COMPANY, of New
York, United States of America, Sewing Machine Manufacture18]
Improvements in Bobbin Cases for Sewing Machine Shuttles,
I, JOHN KING MACDONALD, Manager of The Singer Manufacturing Company,
Kilbowie, Dumbartonshme, do hereby declare the nature of this invention and in
what manner the same 18 to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention has for its object to provide a bobbin-case for sewing machine
shuttles with a bobbin-retaining device which will prevent the bobbin fiom
accidentally falling out of the bobbin-case or holder when the same is being
handled by the attendant in being inscited in or removed from the sewing machine.
To this end the bobbin-case or holder is provided with a movable device or hook
which is normally out of contact with the bobbin, so that the latter may rotate
freely as its thread is unwound, but which is adapted to be forced into engagement
with the bobbin when the bobbin-case oi holder is to be removed from the machine,
so that the bobbin will be retained within the case at such times, during the hand-
ling of the bobbin-case by the attendant, as may be desirable
In the accompanying diawings Fig. 1 is an elevation of one form of bobbin-case
embodying the invention. Figs. 2 and 3 are sectional views of the same on
line 2-3 of Fig. 1, Fig 2 showing the bobbin retaining device disengaged from
the bobbin, while Fig. 3 shows the bobbin retaining device in position to hold
the bobbin in the bobbin-case Figs 4, 5, 6 and 7 illustrate slight modifications
of the invention.
In the drawings A denotes a bobbin-case adapted for the reception of a disc
bobbin b The bobbin-case is preferably provided with a spring-pressed slide c,
such as 18 shown in the Specifications of Letters Patent Nos 14124 of 1890 and 7360
of 1896, and which slide, when in its normal position, engages a pin on the shuttle
and thus seives to retain the bobbin-case within the shuttle, as fully shown and
described in said patenta In the form of the invention shown in Figs 1, 2 and 3
the slide c has pivoted to it a latch or finger-lever d which has, adjacent to its
pivot, a toe-piece or cam d arranged to engage a fixed portion of the bobbin-case
when the said latch or finger-lever is lifted or swung outward, said toe-piece or cam
thereby forcing the slide backward against the stress of its spring g to permit the
larger part of the hole or opening e, with which the said slide is provided, to be
brought into register with the shuttle pin, and thereby disengage the said slide
from said pin so that the bobbin-case may be removed from the shuttle The
slide 18 movable transversely to the axis of the bobbin and is provided with a
bobbin-retaining device movable with said slide and consisting preferably of a
hook or projection which is normally out of contact with the bobbin but which,
when the latch or finger-lever d is lifted or swung outward and the slide is thereby
moved to disengage it from the shuttle pin, will be forced inward so as to engage
one of the flanges of the bobbin 6 and thereby retain the said bobbin within the

page_text: bobbin-case so long as the said finger-level d is in its raised or outwardly swung
position This finger-lever d is intended to serve as a convenient handle in insert-
ing the bobbin-case into the shuttle when the latter is in the machine, or in remov-
ing it therefrom, and so long as said latch or finger-lever remains lifted or swung
outward, as shown in Fig 3, it being utilized as a handle for the bobbin, it 18
obvious that the bobbin will be retained in said case by the hook or projection c³¹
In the form of the invention shown in Figs 4 and 5 the slide which carries
the bobbin-holding projection or hook c¹ is constructed to be forced back against
the stress of its co-operating spring, simply by the pressure of the thumb or finger
nail of the attendant, while in the form of the invention shown in Figs 6 and 7
the movable device carrying the bobbin-retaining hook or projection c² 15 pivoted
to the bobbin-case so as to swing when pressed upon by the attendant to release the
bobbin-case from the shuttle-pin. These slight modifications render the invention
applicable to the forms of bobbin-case locking devices shown in the Specification
of Letters Patent No 14124 of 1890, hereinbefore referred to
While the invention is herein shown and described as being applied to a sliding
or swinging device which also serves to retain the bobbin-case in the shuttle, it
will be understood that it is not necessarily thus applied, but might be used in
connection with other forms of bobbin cases or bobbin-holders than those herein
shown It will therefore be understood that the invention 18 not necessarily
limited to the details of construction herein illustiated and described
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 19
1 The combination with a bobbin-case or holder, of a sping-pressed device
which is movable transversely to the axis of the bobbin and which, when in its
normal position, is located to be out of contact with the bobbin, said spring-pressed
device being provided with a bobbin-retaining device to be forced into engagement
with a flange of a bobbin when the said movable device is displaced from its normal
position
2 The combination with a sewing machine bobbin-case or holder provided with
a latch or finger-lever to serve as a handle, of a spring-pressed device movable
transversely to the axis of the bobbin and connected with the said latch or finger-
lever, said spring-pressed device being provided with a bobbin-retaining device
which is so placed as to be forced into engagement with a bobbin when the said
latch or finger-lever is in a lifted or outwardly swung position
3. The combination with the bobbin case A provided with a locking slide
having a bobbin-retaining hook or projection c¹, the latch on finger-level a hinged
or pivoted to the said slide and provided with a cam or projection serving to move
said slide when the said latch or finger-lever is lifted or swung outward, and a
spring which serves to hold the said slide in its normal or locking position, and
which sping is compressed when the said latch or finger-lever 18 lifted or swung
outward.
Dated L ດາ 1
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