Improvements in Rotary-shuttle Sewing Machines.
Year: 1899

page_text: Date of Application, 11th July, 1899
Complete Specification Left, 9th Apr., 1900-Accepted, 11th Oct., 1900
[Communicated from abroad by EMILIO CATENACCI, of Milan, and CORRADINO
PETRINI and RUGGIERO PETRINI, of Chieti, all in the Kingdom of Italy.]
Improvements in Rotary-shuttle Sewing Machines.
I, WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake & Co., Patent
Agents, 45, Southampton Buildings, in the County of Middlesex, do hereby
declare the nature of this invention to be as follows:-
This invention relates to that class of sewing machines in which a rotary
shuttle and two threads are employed and which shuttle is enclosed in a shuttle
carrier having an oscillating motion around its axis, and its object is to enable
a much larger spool or bobbin for the thread to be employed than those hitherto
employed without endangering the exactitude and uniformity of the stitch.
The spool or bobbin which is mounted on the centre pin of the shuttle has no
other special feature than that of being of very large dimensions.
The shuttle provided with a tension spring, is formed with a circular groove
by means of which it is freely supported in the shuttle carrier.
The
The shuttle carrier is formed with a beak which aids in formation of the
loop, with a side projection and a blunt claw. The side projection is designed
to strike against a stop fixed to the underside of the table of the machine.
claw comes into contact with the needle-guide. From this it results that the
shuttle is not carried along by the shuttle-carrier and is only permitted to
accomplish an oscillation of a few millimeters so as to afford passage to the thread.
The shuttle-carrier receives an oscillatory circular motion around its stationary
axis by any known means.
A convenient arrangement for providing an oscillatory movement to the
shuttle-carrier is as follows:-
This arrangement comprises the driving shaft performing an oscillatory motion
and continuing in an upward direction. A plate fixed to the underside of the
table and serving in supporting the oscillatory shaft of the shuttle carrier.
A rocking lever keyed to the driving shaft. A short link which transmits the
oscillating motion of the driving shaft to the crank which is of a special form
and pivoting around the fixed stud and terminating in a slide head engaging the
stud provided on the lower face of the shuttle carrier. The said crank is made
U-shaped one arm being in suding connection with the pin or stud on the
shuttle carrier and the other arm being pivoted to a fixed stud, the latter arm
being also connected to the short link by which motion is imparted from the
driving shaft to the said crank as above stated.
This however does not form an essential part of the invention which only
consists in the special arrangement of the parts hereinafter described.
The shuttle-carrier is provided with two loop-forming devices, an upper one
and a lower one. This latter is located in the prolongation of the cylindrical
'

page_text: surface which serves to support the shuttle by entering the groove and thus can be
covered by this groove. The pointed portion serves for protecting the needle.
The shuttle carrier is integral with the arm which is furnished with a pin
having for its object to slacken the shuttle thread before the stitch is formed
and to render the stitches thoroughly uniform and regular by obviating the
stress due to the resistance of the spool against rotation, such resistance varying
naturally according to the diameter of the uppermost layer of thread on the
spool and which has been the reason of their being limited to such small
diameters.
The same principle as that involved in the means described for slackening the
thread from the bobbin by the pin may also be applied in order to provide for
the slackening of the needle thread. The bobbin upon which the thread is
wound is not rotated when the thread-tightener descends because the amount
of thread required for the formation of the stitch has been previously given out.
L
111
fTL
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements in Rotary-shuttle Sewing Machines.
I, WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake & Co., Patent
Agents, 45, Southampton Buildings, in the County of Middlesex, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
This invention relates to that class of sewing machines in which a rotary
shuttle and two threads are employed, and which shuttle is enclosed in a shuttle-
carrier having an oscillatory motion around its axis, and its object is to enable
a much larger spool or bobbin for the thread to be employed than those hitherto
employed, without endangering the exactitude and uniformity of the stitch.
The invention is illustrated in the accompanying drawings in which:-
Figure 1 is a view of the shuttle in elevation.
Figure 2 is a plan thereof.
Figure 3 is an inverted plan of the same.
:-
Figure 4 is a view showing the shuttle mounted on the shuttle carrier 6, the
latter being shown as in section the direction of which is indicated by the
line A-B of Figure 3.
Figures 5 and 5ª, 6 and 6ª, 7 and 7ª are views in plan and elevation respectively,
showing the relative positions of the parts during the first successive stages in
the loop formation.
Figures 8, 9, 9ª, 9b, and 10 are views in plan and corresponding elevations,
showing the successive relative positions which the parts occupy during the
completion of the loop formation, and
Figures 11 and 12 are views in plan and elevation illustrating a convenient
arrangement for giving an oscillating motion to the shuttle carrier.
The spool or bobbin 1 which is mounted on the centre-pin 2 of the shuttle 3
has no other special feature than that of being of very large dimensions.
The shuttle 3, provided with a tension spring 4, is formed with a circular
groove 5 by means of which it is freely supported on the shuttle carrier (see
Figure 4).

page_text: The shuttle is formed with a beak 7 which aids in the formation of the loop,
with a side projection S and a blunt claw 9. The side projection 8 is designed to
strike against a stop 10 fixed to the underside of the table 19 of the machine.
The claw 9 comes into contact with the needle-guide 11. From this it results
that the shuttle 3 is not carried along by the shuttle-carrier, and is only per-
mitted to accomplish an oscillation of a few millimeters so as to afford passage to
the thread.
The shuttle-carrier 6 receives an oscillatory circular motion around its
stationary axis 12 by any known means.
The shuttle-carrier is provided with two loop-forming devices, an upper one 13
and a lower one 14. This latter is located in the prolongation of the cylindrical
surface which serves to support the shuttle by entering the groove 5 and thus
can be covered by this groove. The pointed portion 17 serves for protecting
the needle, see Figure 5.
The shuttle carrier 6 is integral with the arm 15 which is furnished with a
pin 16 having for its object to slacken the shuttle thread before the stitch is
formed and to render the stitches thoroughly uniform and regular by obviating
the stress due to the resistance of the spool against rotation; such resistance vary-
ing naturally according to the diameter of the uppermost layer of thread on the
spool, and which has been the reason of their being limited to such small
diameters. The manner of forming the loop will be understood from Figures 5
to 10, in which the direction of rotation of the shuttle carrier is indicated by an
arrow in each figure at the moment when the parts are in the position represented
in the figure.
The needle thread is designated by the letter a a and the shuttle thread by bb.
In the plan and elevation shown in Figures 5 and 5" the loop of the thread a is
ready to receive the loop forming devices 13 and 14 which are now approaching
while in the meantime the pin 16 has released the thread which has been
drawn-off the bobbin I inserted in the shuttle.
The plan and elevation Figures 6 and 6 show how, with the shuttle-carrier
having continued its rotary motion, the loop forming devices 13 and 14 have
placed the loop of the needle-thread a upon the beak 7, and by continuing to
pull it downwards, cause this thread to pass around the shuttle-carrier, the
shuttle thread remaining slack during the whole time.
According to the Figures 7 and 7", of which Figure 7" is an elevation taken
parallel to the plane CD of Figure 7, the shuttle-carrier has continued its
iotary motion in the same direction thereby causing the loop a a of the needle-
thread to engage around the shuttle both over the top and under the bottom;
the upper portion of such loop, on arriving in the position Figure 7, being
retained in the space between 8 and 10 by the projection 8.
Figure 8 shows the shuttle carrier in the extreme position of its throw in the
direction of the arrow. Owing to the action of the ordinary tension the loop a a
of the needle-thread has passed over the projection 8 and is on the point of
sliding, through the influence of the needle, along the crescent shaped side 18, 18,
of the shuttle, as soon as the loopers begin their return motion.
Figure 9 is a plan, Figure 9 a front elevation, and Figure 9b an elevation
taken on the plane of projection E-F of Figure 9 showing the position taken by
the loop of the needle thread due to the rearward return motion of the shuttle-
carrier and loopers, at the moment when it leaves the shuttle by slipping through
the space 9-11 and taking with it the shuttle thread.
Figure 10 shows that the return motion has continued, and that the stitch
has been formed by using the shuttle thread previously slackened-off without
necessitating the rotation of the bobbin.
A convenient arrangement for providing an oscillatory movement to the
shuttle carrier 6 is shown by way of example in Figures 11 and 12 in plan and
in elevation respectively, this being actuating mechanism arranged below the
table of the machine.

page_text: In these figures, 27 is the driving shaft performing an oscillatory motion and
continuing in an upward direction. 20 is a plate fixed to the underside of the
table and serving in supporting the oscillatory shaft 12 of the shuttle carrier 6.
21 is a rocking lever keyed to the shaft 27. 22 is a short link which transmits
the oscillating motion of the shaft 27 to the crank 23 which is of a special form
and pivotting around the fixed stud 26 and terminating in a slide head 24 engag-
ing the stud 25 provided on the lower face of the shuttle carrier 6.
This however does not form an essential part of the invention; which only
consists in the special arrangement of the parts herein before described.
The same principle as that involved in the means described for slackening the
thread from the bobbin 1 by the pin 16 may also be applied in order to provide
for the slackening of the needle thread. The bobbin upon which the thread is
wound is not rotated when the thread-tightener descends, because the amount of
thread required for the formation of the stitch has been previously given out.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, I declare that what I claim is :-
1. In sewing machines working with two threads, and an oscillating shuttle-
carrier, an arrangement permitting the use of bobbins or spools of much larger
diameter than those hitherto employed and with a very small boss, characterized
by an oscillating pin or tooth or its equivalent, adapted to draw-off from the
bobbin in the shuttle previous to the action of the thread-tightener, a sufficient
amount of thread for forming the stitch and so rendering the resistance
encountered by the thread-tightener independent of the speed of the machine
and also of the diameter of the outer layer of threads on the bobbin in the
shuttle.
2. In sewing machines working with two threads and an oscillating shuttle-
carrier, two inclined looping devices or hooks provided on the shuttle carrier and
adapted to operate in combination with a point on the shuttle which bears on
the shuttle-carrier without joining in the movement of this latter, thereby
guiding the upper branch of the loop of the needle-thread over the top of the
shuttle and the lower branch underneath the shuttle whatever be its height;
the shuttle, being 'constructed to receive a much larger bobbin than those of
ordinary size, must naturally be of greater height.
Dated this 9th day of April 1900.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.