Improvements in Sewing Machines.
Year: 1894

page_text: Date of Application, 27th Feb., 1894-Accepted, 5th May, 1894
COMPLETE SPECIFICATION.
Improvements in Sewing Machines.
I, REGINALD HADDAN, of the Firm of Herbert Haddan and 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 Scott Shoe
Machinery Company, of 186 Grand Street, New York, N.Y. United States of
America, 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 certain Improvements in Sewing Machines as pointed
out in the following Specification and claims-and illustrated in the annexed
drawing in which
Figure 1 represents a plan or top view.
Figure 2 is a transverse vertical section in the plane
Figure 3 is a front elevation.
Figure 1.
Figure 4 is a front elevation of the non-rotary support for the bobbin holder the
needle and the loop carrier, the latter being in position to engage the loop of the
sewing thread on a larger scale than the previous figures.
'.
Figure 5 is a side elevation of the fixed support, the bobbin holder and the bobbin,
showing the loop carrier in dotted lines.
Figure 6 is a vertical section showing the non-rotary support for the bobbin
holder and the loop carrier in full lines just before it leaves the loop of the sewing
thread and in dotted lines after it has left said loop the plane. of section being
indicated by the line w w Fig. 2.
Figure 7 is a plan or top view of the parts shown in Fig. 6. (
Figure 8 is a similar view showing the loop of the sewing thread partly
drawn up.
+
Figure 9 is a section of the fixed support detached in the plane y y Fig. 8.
Figure 10 is a section of the bobbin holder and the bobbin in the plane z. z
Fig. 6.
Fig. 11 shows the loop carrier K.
The invention relates particularly to the construction of the bobbin holder
together with its non-rotary support and the construction and operation of the loop
carrier which serves to spread the loop of the sewing thread and to pass the same
over the bobbin bolder and the bobbin which are placed loosely into the fixed
support so that the loop of the sewing thread can be finally drawn up by the
take-up mechanism.
This invention can be applied to different kinds of lock-stitch sewing machines
but in the example illustrated by the drawings 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 drawings the
letter A designates the main shaft to which a revolving motion is imparted by any
suitable means.
This shaft has its bearings in standards. B B which rise from the
base C and from this base rise also two standards D D which form the bearings
for the rockshaft E. F is a lever which is mounted loosely on the rockshaft E and
on the inner end of which is secured a roller stud 10 which engages a groove 11 in
the face of a hub G which is firmly mounted, on the mainshaft A. In the example
shown in the drawing the groove 11 has a short cam 12 (Fig. 2) so that by-the
action of this cam on the roller stud 10 a short oscillating motion, is imparted to
the lever F..
The outer end of the lever F is provided with an arm f on which is firmly

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secured the non-rotary support H for the bobbin holder. This non-rotary support
is constructed of a circular plate 13 and an irregularly shaped plate 14 connected
to plate 13 by a segmental jacket 15, (see Figs. 4, 5 and 9) and it is firmly
connected to the arm of the lever F by rivets or screws 16 which are shown in
section in Figs. 4 and 6 and which pass through the irregularly shaped plate 14. 5
The loose edge of this plate is provided with an outwardly curved lip or flange 17
which serves to guide the outer branch 24 of the loop of the sewing thread
between the bobbin and the plate 14 of the non-rotary support (Fig. 7) as will be
presently more fully explained.
:
From the circular plate 13 of the non-rotary support H projects a stud 18. The
bobbin holder I consists of a circular disk 19 provided with an inwardly curved
flange 20 and with a throat plate 21 and in its centre is secured an arbor 22 which
fits the bub of the bobbin J. (Fig. 10). This bobbin consists of two circular
plates united by a central hub which is bored out to fit the arbor 22 of the bobbin
holder. The bobbin-thread is drawn out through the throat 23 in the throat
plate 21. By referring to Figs. 7, 8 and 10 it will be seen, that the curved
flange 20 of the bobbin holder I extends over the edge of the bobbin J so that it
serves to guide the inner branch 25 of the loop of the sewing thread between:
the circular plate 13 of the non-rotary support H and the bobbin holder I
(Fig. 7).
K is the loop carrier, L is the work-supporting table, M is the presser foot
and N is the needle. In the example shown in the drawing this needle is a hook-
needle which is situated above the work-supporting table and which can be
operated in the mauner described in Patent No. 366,935 above mentioned but it
will be readily understood that an eye pointed needle may be used without departing
from my invention.
The loop carrier K is firmly secured to the outer end of a lever 26 which
oscillates on a pin 27 secured in a bracket 28 which is firmly attached to the rock-
shaft E. (Fig. 1). On the inner end of the lever 26 is secured a roller stud 29
which engages a cam groove 30 in the circumference of a hub O which is firmly
mounted on the mainshaft A. On the rockshaft E is also secured a lever P from
which projects a roller stud 31 into a cam groove 32 formed in the face of a
hub Q which is firmly mounted on the mainshait A.
At the moment when the needle N has drawn up the loop of the sewing thread
to the position shown in Figs. 1, 2, 3 and 4, the loop carrier K passes into the loop
and immediately thereafter the roller stud 29 of the lever 26 enters the curved
portion 30* of the cam groove 30 (the motion of the mainshaft A being in the
direction of arrow 1, Fig. 1) and the loop carrier K is moved up to the position
shown in dotted lines in Fig. 5 and then down to the position shown in Figs. 6
and 7 so that the branch 25 of the loop passes between the circular plate 13 of the
non-rotary support H and the plate 19 of the bobbin holder I while the branch 24
of the loop passes down between the plate 14 of the non-rotary support H and the
bobbin J as shown in Figs. 6 and 7. Immediately thereafter the loop carrier K
moves from the position shown in full lines in Fig. 6 to that shown in dotted lines
in said figure thereby releasing the loop so that the same can be drawn up tight by
the take-up mechanism.
By referring to Figs. 6 and 7 it will be seen that when the loop carrier K has
reached the position shown in full lines in Fig. 6, both branches 24 and 25 of the
loop bear upon the edge of the segment 15 of the non-rotary support H, said edge
forming a stop, whereby the loop is retained while the loop carrier moves from the
position shown in full lines in Fig. 6. to that shown in dotted lines. In order to
prevent the sewing thread from being clamped between the bobbin holder and the
stud 18 by the tension of the bobbin thread the hub G is provided with the cam 12
(Fig. 2) whereby a slight downward movement is imparted to the outer end of the
lever and that part of the bobbin thread between the throat plate 21 and
the work is slackened so that the sewing thread can follow the action of the take-up
mechanism.

page_text: When the loop of the sewing thread is being drawn up, it embraces the bobbin
thread t as shown in Fig. 8 so as to form a lockstitch.
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 bobbin holder, of a non-rotary support
composed of two side plates 13 and 14 and a fixed part 15 rigidly connecting said
side plates together and constituting a loop-stop, a loop-carrier which carries both
branches of the loop round the bobbin holder and between the latter and the two.
side plates of the non-rotary support and places both of said branches upon the
aforesaid stop which retains the loop while the loop-carrier is disengaged therefrom,.
and mechanism for operating the loop-carrier, substantially as described.
2. The combination with a needle, and a swinging lever, of a non-rotary support
fixed to the lever and composed of side plates 13 and 14 and a segment 15 con-
necting said plates and one edge of which constitutes a loop-stop, a bobbin-holder
arranged within the non-rotary support and having its bobbin rotated by drawing.
the thread therefrom, a loop-carrier which carries both branches of the loop around
the bobbin-holder and between the latter and one of the side plates of the non-
rotary support and places both of said branches upon the aforesaid stop which
retains the loop while the loop-carrier is disengaged therefrom, and mechanism for
operating the loop-carrier, substantially as described.
Dated thie 27th dex of February 1891
R. HADDAN.