Improvements in or relating to the Shuttles of Sewing Machines.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to the Shuttles of Sewing Machines.
I, HARRIET RUTH TRACY, of 58, Brondesbury Villas, Maida Vale, in the
County of Middlesex, Gentlewoman, do hereby declare the nature of this inven-
tion to be as follows:-
This invention relates to that class of sewing machines in which a vibratory
or reciprocating shuttle is employed.
In all such machines as heretofore constructed it has been necessary to have
an independent device to take up slack in the formation of each stitch, the
object of this invention is to construct a reciprocating shuttle that will take up
its own slack, without the need of any independent take-up. The shuttle can
therefore be made larger than has been hitherto practicable so as to carry any
desired bulk of thread or other sewing material.
In carrying out the invention I affix at or near the back end of the shuttle,
which may be of any usual shape, an arm, bar rod or the like extending forward,
and preferably above and to one side, to within a short distance of the front end
of the shuttle.
The thread is engaged between the arm and the shuttle so that the slack is
taken up by each complete reciprocation of the shuttle.
BOULT & WADE,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to the Shuttles of Sewing Machines.
I, HARRIET RUTH TRACY, of 58, Brondesbury Villas, Maida Vale, in the
County of Middlesex, Gentlewoman, do hereby declare the nature of this inven-
tion 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 that class of sewing machines in which a vibratory
or reciprocating shuttle is employed.
In all such machines as heretofore constructed it has been necessary to have
an independent device to take up slack in the formation of each stitch, the
object of this invention is to construct a vibratory shuttle that will take up its
own slack, without the need of any independent take-up. The shuttle can there-
fore be made larger than has been hitherto practicable, so as to carry any desired
bulk of thread or other sewing material.
In carrying out the invention I affix at or near the back end of the shuttle,
Price S17

page_text: which may be of any usual shape, an arm, bar, rod, or the like extending for-
wards and preferably above and to one side to within a short distance of the
front end of the shuttle.
The loop of the needle thread, after passing over the body of the shuttle, is
engaged between the arm and the shuttle, so that the slack is taken up by cach
complete reciprocation of the shuttle.
A convenient form of construction for carrying out this invention is shown in
the accompanying drawings of which
Figures 1 and 2 are plan views of a shuttle, having an arm according to this
invention, in different operative positions.
Figure 3 is a section of the shuttle on the line 3-3 of Figure 1.
Figures 4 and 5 are diagrammatic side views of a shuttle in the operative
positions shown in Figures 1 and 2 respectively, showing the relative positions
of the needle and its thread.
Like letters indicate like parts in all the figures.
The shuttle A, which may be of any usual shape, and reciprocate, as shown,
in the arc of a circle, or in a straight line as preferred, is provided with an
arm B, fastened in any convenient manner to the back of the shuttle, say at B¹.
Preferably it is in the form of a flat plate as shown in plan in Figures 1 and 2,
in cross section in Figure 3 and in side view in Figures 4 and 5, but is circular
in cross section where it joins the shuttle as shown at B2. Desirably the free
end of the arm has an upward curve.
C is the shuttle driver, D) the needle, E the needle thread, F the shuttle
thread and G two thicknesses of fabric.
In Figures 1 and 4 the shuttle is shown at the extreme end of its forward
movement having passed through the loop E' of the needle thread, which is
engaged by the portion 132 of the arm B, the needle D having been drawn up
as shown in Figure 4. The shuttle now commences its backward movement,
and the loop slips forward along the arm B. In Figures 2 and 5 the shuttle has
completed its backward movement and again begun to advance; the needle
has commenced to ascend and the shuttle nose has just engaged the thread to form
a second loop, whilst the first loop is free to slip off the arm B and be drawn up
tight to the fabric by the action of the shuttle in forming the second loop.
The slack is thus taken up without having passed a second time through the
eye of the needle.
The shuttle thread acts in the usual manner, as shown at A Figure 4, but is
omitted in the other figures for the sake of clearness.
The shape and size of the arm B may vary according to the material to be sewn
or the type of machine etc.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
:-
1. A vibratory shuttle for sewing machines which takes up its own slack.
2. A vibratory shuttle for sewing machines having an arm for the purpose
described.
Dated this 17th day of October 1899.