Improvements in Sewing Machines.
Year: 1893

page_text: Date of Application, 16th May, 1893-Accepted, 8th July, 1893
COMPLETE SPECIFICATION.
Improvements in Sewing Machines.
I, REGINALD HADDAN, of the firm of Herbert Haddan & Co. of 18 Buckingham
Street, Strand, W.C., London, Patent Agent, do hereby declare the nature of this
invention a communication to me from abroad by Jacob Ruppurt Scott, of
186 Grand Street, New York, N.Y., United States of America Machinist, and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement :-
This invention relates to certain improvements in sewing machines as pointed
out in the following Specification and claims and illustrated in the accompanying
drawing in which
Figure 1, represents a side elevation partly in section.
Figure 2, is a front elevation.
Figure 3, is a plan or top view.
Figure 4, is a side elevation of the bobbin holder detached.
Figure 5, is a side elevation of the bobbin detached.
Figure 6, is a face view of the loop carrier detached.
Figure 7, is a plan or top view of the loop carrier showing the same as it begins
to enter the loop of the needle thread.
Figure 8, is a front view of the bobbin holder and the bobbin.
Figure 9, is a vertical section in the plane x x Fig. 8.
Figure 10 is a transverse vertical section in the plane y y Figures 1, 11 and 13,
the position of the stitch forming devices being that which they occupy in
Figure 11.
Figure 11, is a side elevation showing the stitch forming devices in the position
which they occupy in Figure 10.
Figure 12, is a transverse vertical section in the plane y y Figures 1, 11 and 13,
the position of the stitch forming devices being that which they occupy in
Figure 13.
Figure 13, is a side elevation showing the stitch forming devices in the position
which they occupy in Figure 12.
The invention relates particularly to the construction and operation of the
bobbin holder and of the loop carrier which serves to spread the loop of the sewing
thread and to pass the same over the bobbin holder, said bobbin holder being
provided with sockets in its opposite ends and supported by two pins which
alternately engage the sockets but one of which is out of engagement with its
socket while the other is in engagement and vice versa so that the loop of the
sewing thread can be passed over one end of the bobbin holder while the pin on
that end is out of engagement with its socket and then the pins are changed so
that the loop can pass over the opposite end of the bobbin holder and embrace the
bobbin thread when the slack of the sewing thread is taken up by the take-up
mechanism.
The invention can be applied to different kinds of lock-stitch sewing machines
but in the example illustrated by the drawing I have shown parts of a wax-thread
sewing machine of the class described in United States Letters Patent No. 366,935
granted to Christian Dancel July 19, 1887 in order to explain the movements
of the various parts requisite for the formation of a stitch. In the drawing the
letter A designates the main shaft to which a revolving motion is imparted by
any suitable means. B is the bobbin holder which is constructed of a cylindrical
case closed at one end by a head a and open at the opposite end (best seen in
Figs. 4 and 9). From the head a extends a hub b which is located in the
center of the cylindrical case and terminates in a plane passing through the edge

page_text: of the open end of said case. This hub is provided with sockets c c the inner
ends of which are separated from each other by a partition d. The bobbin or
spool C (Figures 5 and 9) is bored out to fit the hub b of the bobbin holder
and in the cylindrical jacket of the bobbin holder is made an opening or eye e*
through which the bobbin thread t passes as indicated in Figures 1, 2, 3, and
others. A bracket D which is secured to the standard G forming part of the
frame of the machine (best seen in Figs. 1 and 3) serves to retain the bobbin in
the bobbin holder. This bobbin holder is supported in the machine by two
pins e el which are secured in a yoke E in such a position that either of said pins
can be thrown in engagement with one of the sockets c or c¹ in the bobbin holder
and that if the pin e is thrown in engagement with the socket c, the pin el is out of
engagement with the socket e¹ and vice versa. The yoke E is guided in a groove e²
in the top of the standard G (Figures 10 and 12) and in its tail is secured a roller
stud e³ which engages a cam groove et formed in the hub L mounted on the main
shaft A. The pin e extends through a tubular shaft which has its bearings in the
standard G and on the outer end of which is mounted the loop carrier F while on
its inner end is mounted a pinion f which engages a toothed segment
formed on
the inner end of a lever H. The outer end of this lever is pivoted to a standard G¹
which forms part of the main frame and on said lever is secured a roller stud /¹
which engages a cam groove in the hub M mounted on the main shaft A (see
Figs. 1 and 3). As the main shaft revolves an oscillating motion is imparted to
the lever H and by the co-operation of the toothed segment and the pinion fla
reciprocating rotary motion is imparted to the loop carrier. I is the work support,
J the presser foot and n is the needle which is situated above the work support and
passes down through the work W and after having received the sewing thread,
draws the same up through the work so as to form the loop 1. At the moment
when the needle has reached the position shown in Figures 1, 2 and 3, the loop
carrier is moved in the direction of the arrow shown near it in Fig. 2 so that it
enters the loop (see Figs. 10 and 11) while the needle moves out of the way of
the loop carrier. During the time the loop carrier completes part of this move-
ment, the position of the yoke E is changed so that the pin e¹ cuters the socket c'
of the bobbin holder B and the pin e is withdrawn from its socket (see Fig. 11)
and as the motion of the loop carrier continues that portion of the loop / which
connects with the take-up mechanism T is drawn up over the inner end of the
bobbin holder. At the moment the thread has passed the socket c in the inner end
of the bobbin holder, the position of the yoke E is changed (see Figs. 12 and 13)
the pin
e enters the socket c and the pin e' is withdrawn from the socket c' and
then the loop carrier F is withdrawn from the loop and returned to its original
position, while by the action of the take-up mechanism, the loop is drawn down
over the outer end of the bobbin holder and made to embrace the bobbin thread.
All these movements take place while the hub which contains the cam groove e
turns from the position shown in Fig. 1 to that shown in Fig. 13 and the hub
which engages the roller stud / on the lever H must be formed so that during the
above named movement of the hub containing the cam groove e¹ the toothed
segment h causes the pinion to make a complete revolution in one direction and
then a complete revolution in the opposite direction.
с
After the loop of the sewing thread has been carried over the bobbin holder and
drawn up tight in the work W the feed motion takes place and the bobbin holder
is drawn up against the bracket D. In order to allow the loop of the sewing
thread to pass freely between the outer end of the bobbin holder and said bracket
the partition d is left between the sockets c c¹ and the pin e¹ of the yoke E is
adjusted in such a position, that when the yoke is moved into the position shown in
Figure 11, the tip of said pin strikes the partition and pushes the bobbin
holder inward so as to leave an open space between the same and the bracket D.
This bracket also serves to retain the bobbin holder in position against the
strain of the bobbin thread so that when the pin e of the yoke enters the socket c of
the bobbin holder, the latter is not liable to be thrown forward upon the pin e'.

page_text: In the example represented by the drawing the movement of the yoke E and of
the loop carrier F is completed during one sixth of the revolution of the shaft A,
but if desired a continuous rotary motion can be imparted to the loop carrier and if
the loop carrier makes six revolutions for each revolution of the main shaft A, it
will carry the loop of the sewing thread over the bobbin holder during one of these
revolutions and perform no work during the remaining five revolutions.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The combination with a needle, and a loop carrier, of a bobbin holder
provided with sockets in its opposite ends, two pins extending in opposite directions
and movable back and forth for alternately engaging said sockets, and means for
moving the pins in opposite directions, substantially as described.
2. A bobbin holder for a sewing machine, consisting of a cylindrical case having
a central bobbin or spool carrying hub b to enter a center orifice in the bobbin or
spool and provided with a partition d which divides said hub into two separate
sockets c and c¹ extending in line with the axis of the hub, substantially as
described.
3. The stitch forming mechanism of a sewing machine, comprising a bobbin
holder provided with sockets in its opposite ends, a yoke provided with pins
projecting therefrom in opposite directions for engaging, one at a time, the sockets
of the bobbin holder, a loop carrier, and means for reciprocating the yoke and
operating the loop carrier, substantially as described.
4. The combination with a needle, of a bobbin holder B provided with sockets in
its opposite ends, a standard G, a yoke E, guided in the standard, a tubular shaft f
mounted in the standard, a loop carrier mounted on the tubular shaft, a pin e carried
by the yoke and extending through the tubular shaft, a pin el extending from the
yoke, and means for reciprocating the yoke and rotating the tubular shaft, substan-
tially as described.
5. The combination with a needle, and a loop carrier, of a bobbin holder
provided with sockets in its opposite ends, a reciprocating yoke provided with pins
projecting therefrom in opposite directions for engaging, one at a time, the sockets
of the bobbin holder, a bracket for retaining the bobbin holder in position against
the strain of the bobbin thread, and means for operating the loop carrier and
reciprocating the yoke, substantially as described.
Dated this 16th day of May 1893.
Dated this 16th day of May 1893.
R. HADDAN.
Herbert Haddan & Co.,
18, Buckingham Street, Strand, London.