Year: 1887

page_text: Date of Application, 21st Feb., 1887.
Complete Left, 18th July, 1887.
Complete Accepted, 19th Aug., 1887.
I, JOHANNES BÜHR, of Hamburg, in the Empire of Germany, Manufacturer, do
hereby declare the nature of this invention to be as follows:-
This invention relates to ring shuttles in sewing machines, and to the respective
shuttle case and spool case, and has for its purpose to simplify the construction and to
allow large under-thread spools to be employed in machines which work without
thread lifter.
The shuttle has a recess for receiving the spool case and the rear part of the shuttle
forming this recess is provided with a projection, behind which is caught the loop of
the upper thread widened by the rotation of the shuttle, until the needle has attained
the lowest point and the point of the shuttle has entered the new loop. As soon as
this is the case the said projection is turned so much sideways, that the loop slides off
the same, and subsequently, when the needle moves upward, is drawn by the same
and forms the stitch.
The shuttle case which is driven direct or by transmission from the chief axle of
the machine, is at the same time driver of the shuttle by two projections of the same
abutting against corresponding projections of the shuttle and thereby take the
same along when rotating.
To cause the thread drawn off the spool, to retain always the same length while the
shuttle rotates, the spool case has a central bore, through which the thread leaves.
The spool case with the spool contained in the same, is lodged on a pin in the centre
of the shuttle.
To secure the casing in the proper position within the shuttle, a plate is placed over
This plate may
the same, which is lodged in the frame by means of an elastic arm.
be suitably provided with a small roll, which catches into a recess of the spool case,
so that the thread can easily pass between the rotating pressing roll and the
apool case

page_text: The described arrangements of the shuttle thread and shuttle driver may also be so
modified, that the shuttle is provided with two correspondingly placed recesses, into
which catch two projections of the shuttle driver for securing an absolutely certain
seizure of the shuttle and thereby a more certain working of the machine.
In the latter arrangement preferably the centres of the shuttle slide and driver are
slightly displaced towards one another, whereby alternately one of the projections lies
securely in the respective recess of the shuttle and impels the same, while the second
projection receives some play in the recess, so as to allow the thread to slip freely
through between the shuttle and the driver.
Dated this 01at day of Faber 1887

page_text: Improvements in Sewing Machines.
I, JOHANNES BÜHR, of Hamburg, in the Empire of Germany, Manufacturer, do
hereby declare the nature of the said invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
This invention relates to ring shuttles in sewing machines, the respective shuttle
case, the spool case and the impulsion device for the shuttle, and has for its purpose
to simplify the construction and to allow large under thread spools to be employed in
machines without double axle, therefore without thread-lifter.
Referring to the accompanying drawings Figs. 1 and 2 are views of the shuttle
and the respective parts in two positions of the needle; the holding device for the
spool case differs also in Figs. 1 and 2. Fig. 3 is a cross section in plan along the
centre-line of Fig. 2. Fig. 4 is a cross section in side view of Fig. 1. Fig. 5 is a
front view of the shuttle case, with shuttle removed. Figs. 6 and 7 are front view
and plan of the shuttle respectively and Figs. 8, 9 and 10 are views of the spool and
spool case.
The shuttle S differs from other ring shuttles by having a projection at the rearward
bent part at a behind which projection is caught the loop of the upper thread widened
by the shuttle, as shown in Fig. 2, until the needle has reached the lowest point, and
the point of the shuttle has again entered the new loop. As soon as this has taken
place (Fig. 1) the projection a has been so far laterally displaced, that the loop slides
off the projection and when the needle ascends is drawn by the same, and forms
the stitch.
The shuttle case k, which is actuated by the axle m from the main shaft of the
machine by transmission is at the same time driver of the shuttle, the points e and e¹
coming in contact with corresponding projections of the shuttle take the same along
when rotating. To prevent the thread from falling off backwardly over the case, a
tongue or projection is arranged at o i.e. where the thread must pass through
between the case and shuttle. This projection is situated close to the driving
extremity and retains the thread to the front.
b
To cause the thread drawn off the spool p to retain always the same length a central
bore t is provided in the spool case x, through which bore the under thread leaves.
A centrally perforated plate b (Fig. 1) secured by a spring arm h to the framing, or a
horse shoe plate 6 (Fig. 2) in combination with a roll and arm h¹ presses the spool
case on to the framing so that the spool situated on a central pin, therein is secured in
its position. The roll may suitably catch into a recess d (Fig. 8) laterally arranged
to prevent the case from turning, the roll being pressed therein by an adjustable
spring z. This roll has the advantage of easily allowing the thread to pass since it
revolves as soon as the thread slides through.
on x,
The above described arrangement of the impulsion device of the shuttle by means
of the projections e e¹ may be suitably modified in the following manner to ensure an

page_text: absolutely secure carrying along of the shuttle and thereby a more exact working of the
machine. The shuttle is, as shown by Figs. 11 and 14 provided with two correspond-
ingly arranged recesses ss, into which catch two projections ff of the shuttle-driver k.
Figs. 12 and 13 show the shuttle driver in front view and cross section. As shown
by Fig. 12, the centres of the shuttle course and driver are slightly displaced with
regard to each other so that there is always one of the projections in close contact
in the respective recess of the shuttle and impelling the same, while the second
projection lies with some play in the recess, so that the thread can pass unimpededly
between shuttle and driver.
Having now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed, I declare that what I claim is:
1. A spool case x, for ring shuttles, with a central bore t for the passing of the
thread, and an outer recess d for the reception of an elastic roll or an elastic arm, to
prevent the case from turning.
2. In combination with the spool case referred to in Claim 1, the ring shuttle S having
the projection a at the rearward lying part of the shuttle for temporarily holding the
widened loop.
3. The combination of the shuttle driver k having two projections ff¹, with the
shuttle S having two recesses s s¹, the axes of the shuttle and driver being displace-
able with regard to one another, so that always one of said projections is alternately
in close contact in one of said recesses while the other projection lies loosely in the
other recess for the purpose set forth.