IMPROVEMENTS . ON CIRCULAR SHUTTLES WITH INSERTED-SPOOL FOR SEWING MACHINES AND IN MECHANISM FOR OPERATING THE SAME
Year: 1882

page_text: LETTERS PATENT to Ferdinand Otto Schmidt of the City of Berlin in the
Kingdom of Prussia and German Empire for an Invention of IMPROVEMENTS
.
ON CIRCULAR SHUTTLES WITH INSERTED-SPOOL FOR SEWING MACHINES AND
IN MECHANISM FOR OPERATING THE SAME.
PROVISIONAL SPECIFICATION left by the said Ferdinand Otto Schmidt
at the Office of the Commissioners of Patents on the 13th November 1882.
FERDINAND OTTO SCHMIDT of the City of Berlin in the Kingdom of Prussia and
German Empire. IMPROVEMENTS ON CIRCULAR SUUTTLES WITH INSERTED SPOOL
FOR SEWING MACHINES AND IN MECHANISM FOR OPERATING THE SAME.
My said invention relates to improvements in circular shuttles with inserted
spool for sewing machines and in mechanism for operating the same and relates
to the following principal parts of my said invention, that is,
Firstly to improvements on circular shuttles with free inserted spool for sewing
machines.
Secondly to improvements on mechanisms for operating such said shuttle and
other moveable parts of the said sewing machine.
aǹ
The latter parts consist of a thread press or tension arrangement to assure the
regular feed of the thread a self acting thread guide for the needle thread
arrangement for guiding the shuttle at the lower part of the machine and two
modifications of such said arrangement, a second arrangement for attaining the
same result as described under c and a third arrangement for attaining a like
result.
The shuttle is provided with a nose for taking up the needle thread and a cavity
or recess formed between two projections to the shuttle in which said recess or
cavity a pin on the driving disc works. The shuttle is laterally provided with
two large recesses or cavities in order to facilitate the introduction of the thread.
A hollow pivot provided with suitable screw threads is arranged in the centro of
the shuttle to receive a third guide which said thread guide is held in correct
position by means of a suitable screw.

page_text: The said thread guide is provided with a perforated vertical wall through the
perforations of which the thread is passed in order to attain a higher tension.
The thread guide is provided with a central tube by means of which the said
guide can be slid over the pivot to the shuttle. The thread guide can rotate freely
in its hollow pivot which latter is provided with a small spring in order to produce
sufficient friction to hold the spool.
The said spring exercises a slight pressure on the spool which is increased by
the thread being passed through the tension holes in order to attain a still greater
tension. The shuttle is provided near the lateral recess or cavity with an incline
so as to permit the needle thread to pass freely.
The tension mechanism or thread press is employed in order to hold or arrest
the thread when the needle guide descends and to give the said thread at correct
moment free so that even when the thread is under the slightest tension the shuttle
cannot draw the thread at the wrong time.
This said tension mechanism or arrangement is as follows; -
A small projection or incline surface is attached to or made of one piece with
the needle slide by means of which said projection or incline and the projection
or incline to a suitable pressure spring this said spring is forced outwards
The upper end of the said spring which receives a special form for such purpose
is now freed from contact with two compression lugs and frees the thread from
pressure. As soon as the slide descends (the said pressure spring comes again into
operation so as to prevent any further quantity of thread from being drawn from
the spool.
The thread freed is arranged as follows.
The thread guido or feeder is pivotted to the frame of-the-machine and is
moved up and down by means of a pin or pivot attached to the needle slide
which-said pin or pivot is guided in a slot in the said thread guide or feed.
This up and down movement of the noedle slide and the thread feed is attained
by means of an excentric-which said_excentric which gears into and is guided by a
suitable cam groove.
The excentric is fixed to the same axle with an excentrically arranged roller or
friction ring in such manner that the needle bar reaches its highest point in advance
of the needle slide and the thread guide or feed.
The excentrically arranged ring or roller runs in a cam groove in a piece of metal
attached to the needle bar.
This arrangement of the selfacting thread feed by means of the excentric and
the cam groove for guiding same possesses the advantage that all springs which
tend to cause an inaccurate operation of the parts are avoided.
The mechanism or parts for operating the shuttle are constructed in such manner
that the said shuttle makes more than a semi revolution whilst the needle is in its
lowest position. The vertical shaft carries at its lower end a disc in which said
disc a rotary pivot is excentrically arranged.
This rotary pivot is square at its lower extremity which said square part is
guided on a suitable slot in a second disc located beneath the disc carrying the
said pivot
This said second disc rotates in a suitable circular guide or carrier and is
provided with a second slot in which a second square pivot is guided. The lower
part of this said pivot is round and can rotate in the driving rod to the shuttle
carrier. I lay no special claim to this latter part of my said arrangement as similar
arrangements have been already made by others.
The driving rod is provided with an elongated slot so that the said driving rod
not only receives a backward and forward motion but is also caused to oscillate
so that a revolution of the shuttle carrier is attained in such manner that the
shuttle is caused to make more than half a revolution during the time that the
pivot to the lower dise has made somewhat over a quarter revolution.
This arrangement I also modify in such manner that instead of employing the
first or upper slotted disc I use two slotted cranks.
L'

page_text: The vertical shaft axle or spindle to the machine carries at its lower end a disc
in which a pivot can turn which said pivot is round at its upper and square at its
lower half. The lower square part of the pivot works in the slotted crank which
by means of a suitable axle can revolve in the bracket or bearing.
The lower part of this said axle is provided with a second slotted crank placed
in opposite position to the crank first mentioned which said second crank carries in
its slot a pivot which is moveably attached to the driving rod to which said driving
rod the pivot transinits its movement.
The driving rod is supported by means of a ball or its equivalent which said
ball is held by and can move on a suitable supporting disc.
The shuttle carrier receives its rotary motion as above mentioned from the
driving rod.
These parts can be retained but the general arrangement so modified that the
mechanism for producing the backward and forward and the oscillating movement
of the driving rod is placed immediately below the shuttle carrier whereas the
vertical axle of the machine is provided only with an excentrical pivot which is in
connection with the driving rod.
This arrangement is consequently the reverse to the arrangement aforedescribed
and can be employed by all and every the modifications as described in this said
specification without departing from the tenor of my said invention.
Another modification of my said invention is arranged as follows:-A crank
attached to the lower end of the vertical shaft or axle is connected to the driving
rod by means of a suitable pivot.
The driving rod is guided in a moveable fork and is provided at the opposite
end with a rod or arm which said rod or arm can revolve around the pivot in
the end of the said driving rod. This rod or arm is guided in a revolving piece
of metal attached to the shuttle carrier which said piece of metal is bored for such
said purpose.
At such time as the crank on the vertical axle or shaft has made one quarter
of a revolution the shuttle carrier has inade more than half a revolution..
According to a further modification the parts are arranged substantially as
described in the foregoing modification.
A crank fixed to the lower end of the vertical axle or shaft is connected to the
driving rod as before described which said driving rod works in the moveablo fork
as above mentioned.
At the opposite end of the driving rod is a short lever arranged to turn around
the pivot in the driving rod.
This lever is pivotted to a second lover placed immediately above the first
lever which said second lever is connected at its opposite end to the shuttle
carrier and causes such said shuttle carrier to rotate in the manner already
described above.

page_text: =
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Ferdinand Otto Schmidt in the Great Seal Patent Office on the
11th May 1883.
FERDINAND OTTO SCHMIDT of the City of Berlin in the Kingdom of Prussia
and German Empire "IMPROVEMENTS ON CIRCULAR SHUTTLES WITH INSERTED
SPOOL FOR SEWING MACHINES AND IN MECHANISM FOR OPERATING THE SAME
"
My said invention relates to improvements in circular shuttles with inserted
spool for sewing machines and in mechanism for operating the same and relates to
the following principal parts of my said invention, that is, Firstly, to improvements
on circular shuttles with free inserted spool for. sewing machines, Secondly, to
improvements on mechanisms for operating such said shuttle and other moveable
parts of the said sewing machine
The latter parts consist of (a) a thread press or tension arrangement to assure
the regular feed of the thread, b/ a selfacting thread guide for the needle thread, "/ an
arrangement for guiding the shuttle at the lower part of the machine and two
modifications of-such said arrangement, / a second arrangement for attaining the
same result as described under cand / a third arrangement for attaining a like
result, which can be employed with the Singer, Howe etc machine systems.
Figure 1 is an elevation
Eigure 2 a plan or top view-of-an improved circular shuttle with thread guide
Figure 3 is a side view and
Figure 4 a section of Figure-2-on-the-line A. B..
Figure 5 is a side view of the thread guide
Figure 6 is a second view of the same in order to show the perforated wall.
Figure 7 is a top view and
Figure 8 a side view of the spool.
The shuttle is provided with a nose e for taking up the needle thread and a
cavity or recess f formed between two projections to the shuttle in which said
recess or cavity a pin on the driving disc works. The shuttle is laterally provided
with two large recesses or cavities in order to facilitate the introduction of the
.thread.
A hollow pivot g provided with suitable screw thread is arranged in the centre
of the shuttle to receive a thrend guide. h which said thread guide is held in
correct position by means of a suitable screw i
.
.
The said thread guide h is provided with a perforated vertical wall k, through
the perforations of which the thread is passed in order to attain a higher tension.
The thread guide is provided with a central tube 7 by means of which the said
guide can be slid over the pivot / to the shuttle.
The thread guide can rotate freely in its hollow pivot which latter is provided
with a small spring m in order to produce sufficient friction to hold the spool.
The said spring m exercises a slight pressure on the spool which is increased by
the thread being passed through the tension holes in order to attain a still greater
tension.
The shuttle is provided near the lateral recess or cavity with an incline so as to
permit the needle thread to pass freely.
The Figures 26, 27, 28 show a modification of the shuttle with the thread tension
or pressure in the thread guide in top view, side view, and elevation-The thrend
guide a is provided with an incl.ned projection b³ which leans against a nose or
projection on the lower side of the table near the needle hole so that the thread
cannot be carried forward when the shuttle rotates The thread is held under

page_text: tension in the following manner instead' of employing the arrangement shown in
Figures 1 to 8
On the inner side of the thread guide is a spring c³ which at its free end is
formed like a spoon and is provided with a small flange which fits into a hole in
the thread guide through which the thread is drawn so that the thread is held by
the spring.
The thread passes from here through the tension hole d'the tension can be
varied by the pressure spring or slide.c on the spring being adjusted to
requirements.
Figure 9 is an elevation and Figure 10 a side view of the thread press. Figure 9.
and 11 represent the thread feed in elevation and side view
The tension mechanism or thread press is employed in order to hold or arrest
the thread when the needle guide descends and to give the said thread at correct
moment free so that even when the thread is under the slightest tension the
shuttle cannot draw thread at the wrong time-This said tension mechanism or
arrangement is as follows.-
A small projection or inclined surface o is attached to or made of one pieco
with the needle slide by means of which said projection or incline and tho
projection or incline to a suitable pressure spring p, this said spring p is forced
outwards.
The upper end of the said spring which receives a special form for such purpose
is now freed from contact with two compression lugs q and frees the thread from
the pressure As soon as the slide descends the said pressure spring p comes again
into operation so as to prevent any further quantity of thread from being drawn
from the spool.
The thread feed is arranged as follows.
The thread guide or feeder r is pivotted at s to the frame of the machine and is
moved up and down by means of a pin or pivot t attached to the needle slide m
which said pin or pivot.is guided in a slot u in the said thread guide or feed.
This up and down movement of the needle slide and the thread feed ris
attained by means of an excentric v which said excentric gears into and is guided
by a suitable cam groove w.
The excentric vis fixed to the same axle with an excentrically arranged roller
or friction ring in such manner that the needle bar reaches its highest point in
advance of the needle slide and the thread guide or feed.
The excentrically arranged ring or roller x runs in a cam groove y in a piece of
metal z attached to the needle bar. This arrangement of the selfacting thread feed
by means of the excentric and the cam groove for guiding the same possesses the
advantage that all springs which tend to cause an inaccurate operation of the
parts are avoided
Figure 11 represents an arrangement of the mechanism of the shuttle in longi-
tudinal section. Figure 13 is a detailed * of the suspension for the slotted
disc al and Figure 14 a top view of the same.
The mechanism or parts for operating the shuttle are constructed in such manner
that the said shuttle makes more than a semi revolution whilst the needle is in its
lowest position. The vertical shaft b' carries at its lower end a disc c¹ in which
said disc a rotary pivot d' is excentrically arranged. This rotary pivot is square
at its lower extremity which said square part is guided in a suitable slot el in a
second disc a' located beneath the disc c' carrying the said pivot-This said second
"disc" a¹ rotates in a suitable circular guide or carrier f' and is provided with a
second slot'g' in which a second square pivot h¹ is guided. The lower part of this
suid pivot h' is round and can rotate in the driving rod i to the shuttle carrier k
I lay no special claim to this latter part of my said arrangement as similar
arrangements have been already made by others.
The driving rod is provided with an elongated slot k so that the said driving
rod. not only receives a backward and forward-motion- but is also caused to
oscillate so that a revolution of the shuttle carrier f¹-is-attained in such manner

page_text: that the shuttle is caused to make more than half a revolution during the time
that the pivot d¹ to the lower disc has made somewhat over a quarter revolution.
This arrangement I also modify in such manner that instead of employing the
upper slotted disc a' I use two slotted cranks q¹ rª¹.
Figure 15 is a longitudinal section of this modification.
Figure 16 is a cross section of Figure 15 on the line l¹ m².
Figure 17 is a section of Figure 15 on the line n' o'
Figure 18 a side view of the bearing p'.
The vertical shaft, axle or spindle to the machine carries at its lower end a
disc t'in which a pivot u can turn which said pivot is round at its upper, and
square at its lower half-The lower square part of the pivot u works in the slotted
crank q which by means of a suitable axle v can revolve in the bracket or
bearing p¹.
The lower part of this said axle is provided with a second slotted crank r
placed in opposite position to the crank q' first mentioned, which said second
crankcarries in its slot a pivot w¹ which is moveably attached to the driving
rod to which said driving rod the pivot transmits its movement
The driving rod is supported by means of a ball y' or its equivalent which
said ball is held by and can move on a suitable supporting disc s³¹
The shuttle carrier receives its rotary motion as above mentioned from the
driving rod. These parts can be retained but the general arrangement so modified,
as shown in Figure 19, that the mechanism for producing the backward and
forward movement of the driving rod is placed immediately below the shuttle
carrier whereas the vertical axle of the machine is provided only with an excentrical
pivot which is in connection with the driving rod
This arrangement is consequently the reverse to the arrangement aforedescribed
and-can be employed by all and every the modifications as described in this said
specification without departing from the tenor of my said invention...
Another modification of my said invention is arranged as follows and shown in
the Figures 20 and 21 in longitudinal section and top view: A-crank-attached_
to the lower end of the vertical shaft or axle a² is connected to the driving rod d
by means of a suitable pivot c².
The driving rod is guided in a moveable fork e² and is provided at the opposite
end with a rod or arm f which said rod or arm can revolve around the pivot g² in
the end of the said driving rod. This rod or arm is guided in a revolving piece
of metal piece h" attached to the shuttle carrier, which said piece of metal is bored
for such said purpose.
At such time as the crank 62 on the vertical axle or shaft has made one quarter
of a revolution, as shown by the dotted lines in Figure 21, the shuttle carrier has
made more than half a revolution.
According to a further modification as shown in the Figures 22 and 23 in
longitudinal section and top view, the parts are arranged substantially as described
in the foregoing modifications.
A crank fixed to the lower end of the vertical axle or shaft is connected to the
driving rod k as before described which said driving rod works in the moveable
forks m³ as above mentioned
At the opposite end of the driving rod k² is a short lever n³ arranged to turn
round the pivot o³ in the driving rod
This lever is pivotted at p³ to a second lever q' placed immediately above the
first lever n which said second lever is connected at its opposite end, to the
shuttle carrier and causes such said shuttle carrier to rotate in the manner already
described above.
The Figures 24 and 25 show the application of my invention as shown in
Figure 20 and 21 to the Howe Sewing Machine.
One of the cams with excentric groove, which in the Howe Machine serves to
operate the shuttle carrier is replaced by my mechanism.

page_text: A bevil wheel g³ is attached to the spindle or shaft f³ and gears into the bevil
wheel which revolves around the pin k in the bracket 2
The crank is carried by the casing or shell to the pin or pivot k³ or in other
suitable manner so that a revolution of the shaft or spindle causes a proportionate
'movement of the shuttle carrièr as described in reference to the foregoing
modifications.
It is evident that the form; construction and arrangements of the parts can be
modified in many ways without departing from the tenor of my invention.
"
Having now described my said invention and the manner, in which the same is to
or may be carried into effect I wish it to be understood, that what I claim and
desire to secure by Letters Patent is :-
On Sewing Machines :-
1-The arrangement construction and employment of a circular shuttle with
inserted thread guide for putting the thread under tension whereby the hollow
pivot 7 of the shuttle is provided with a small flat spring m so that the spool is
somewhat clamped and in this manner causes a further tension of the thread
substantially as described in the foregoing specification and shown in Figures 1 to 8
in the accompanying drawings.
2-The construction arrangement and employment of the circular shuttle with
inserted thread guide a³ with projection 63 which said projection b³ is in contact
with a nose or projection on the table and is provided with a slide e³ and an
adjustable spring for regulating the tension of the thread substantially as described
in the foregoing specification and shown in the accompanying drawings.
3-The arrangement, construction and employment of a thread tension devico
or press consisting of a nose or projection n on the needle slide and a corresponding
nose or projection o on the spring p which latter is pressed back by n when the
needle slide is raised, the spring freed from the two compression lugs q and the
thread also given free substantially as described in the foregoing specification and
shown in Figures 9 and 10 of the accompanying drawings.
บ
4 The arrangement construction and employment of an excentrical disc which
is excentrically attached to the horizontal driving spindle or shaft and is so guided
in the curve w that the needle slide and also the thread feed is or are automatically
moved up
and down substantially as described in the foregoing specification and
shown in Figures 9 and 11 of the accompanying drawings.
5-The arrangement construction and employment of the disc al, in the bearing
or bracket f whereby the said disc a' is provided with two slots, is guided by the
pin or pivot d' attached excentrically to the disc c¹ and guides the pin or pivot h¹
in its slot g' in combination with the driving rod which makes an oscillating
movement and transmits a rotary motion to the shuttle carrier substantially
as described in the foregoing specification and shown in Figures 11 and 12 of the
accompanying drawings.
6-The arrangement construction and employment of two slotted cranks q¹ 71 on
one and the same shaft or spindle instead of the slotted disc a' in order to transmit
motion to the driving rod substantially as described in the foregoing specification
and shown in Figures 15 to 18 of the accompanying drawings.
7-The construction arrangement and employment of a crank b and the driving
rod attached to the same which said driving rod is guided in the fork e² and
transmits a rotary movement to h² and the shuttle carrier by means of the rod fi
substantially as described in the foregoing specification and shown in Figures 20
and 21 of the accompanying drawings.
8. The arrangement construction and employment of the crank it in combination
with the driving rod which is guided in the moveable fork m² and communicates,
by means of the lever n which acts on the lever 9³, a rotary movement to the
shuttle carrier substantially as described in the foregoing specification and shown
in Figures 22 and 23 of the accompanying drawings.
9-The arrangement construction and employment of the bevil wheels g³ ³ on

page_text: the spindles or shafts f³ ³ in combination with the crank for operating the
shuttle carrier substantially as described in the foregoing specification and shown
in Figures 24 and 25 of the accompanying drawings
In witness whereof I the said Ferdinand Otto Schmidt have hereunto set my
hand and seal this twelveth [sic] day of April in the year of our Lord One-
thousand eight hundred and eighty three.