Improvements in Sewing Machines.
Year: 1889

page_text: Date of Application, 16th Apr., 1889
Complete Specification Left, 16th Jan., 1890-Accepted, 16th Apr., 1890
PROVISIONAL SPECIFICATION.
Improvements in Sewing Machines.
I, THOMAS SHEWARD PERCY of 84 Stafford Street Dudley in the County of
Worcester Tailor and Draper do hereby declare the nature of my said invention to be
as follows:-
My invention has for its object improvements in sewing machines which is
particularly applicable to the "Singer" and the "Howe" but can readily be adapted
to any other shuttle machine and by which the shuttle thread is operated in such a
manner as to form a knot stitch or double lock stitch machine this being done in an
effective way by a very simple and cheap arrangement which can be readily applied
to existing machines.
"
I will proceed to describe my improvement applied to an existing "Singer
machine. I attach a lever upon a pivot to the bed or table of the machine having at
one end a bent fork or other arrangement for engaging with and receiving its motion
from the bent end of the feed lever. The other end of my pivoted lever is connected
to a pivoted hook in such a manner as to cause the hook to draw the under or shuttle
thread to the outside of the throat each time the shuttle is standing back and as soon
as the heel of the shuttle has gone past the throat a loop is thereby formed through
which the needle passes in its descent to form its ordinary stitch. The hook then
leaves the shuttle thread and returns to its former position in a recess formed in the
throat or needle plate. After having passed through the loop of the shuttle thread
which was held by the hook on the outside of the throat the shuttle passes through the
ordinary loop that the needle thread makes on the front side of throat thus forming
two loops instead of one as at present and making a stich which is a knot stitch or
double lock stitch. For the purpose of connecting and disconnecting the knot stitch
arrangement I form my operating lever in two parts which are connected together by
a small latch which is operated by a knob or button so that by pressing the knob the
lever would become disengaged and the ordinary stitch would be at work.
As the feed lever from which my lever obtains its motion takes a rotary motion the
fork of the lever only rests upon it so as to take the upward and downward motion
without any longitudinal movement.
In the case of the "Howe" a pivoted lever would be provided which receives its
motion from the main shaft, and operates a hooked rod in a horizontal direction
for pushing the shuttle thread past the throat of the machine for the purpose as
before described.
A small knife is provided for cutting the thread when required and is let into a
hole in the bed of the machine and mounted upon a hinged lever under the bed the
other end of which is provided with a knob or button which also rises through the bed
so that when the knife is required the button is pressed down and the knife rises
afterwards falling by its own weight the top and back of the knife being cased square
so that when down it forms a surface with the bed.
1 1000

page_text: COME DEI DT BUITIVATION.
Improvements in Sewing Machines.
I, THOMAS SHEWARD PEROY of 84 Stafford Street Dudley in the County of
Worcester Tailor and Draper do hereby declare the nature of my said invention to be
as follows:-
My invention has for its object improvements in sewing machines and is particularly
applicable to the "Singer" and the "Howe" but can readily be adapted to any other
shuttle machine and by which the shuttle thread is operated in such a manner as to
form a knot stitch or double lock stitch this being done in an effective way by a very
simple and cheap arrangement which can be readily applied to existing machines.
"
I will proceed to describe my improvements applied to an existing "Singer'
machine. I attach a lever upon a pivot to the bed or table of the machine having at
one end a bent fork or other arrangement for engaging with and receiving its motion
from the bent end of the feed lever. The other end of my pivoted lever is connected
to a pivoted hook in such a manner as to cause the hook to draw the under or shuttle
thread to the outside of the throat each time the shuttle is starting back and as soon
as the heel of the shuttle has gone past the throat a loop is thereby formed through
which the needle passes in its descent to form its ordinary stitch. The hook then
leaves the shuttle thread and returns to its former position in a recess formed in the
throat or needle plate. After the needle has passed through the loop of the shuttle
thread which was held by the hook on the outside of the throat the shuttle passes'
through the ordinary loop that the needle thread makes on the inside of throat thus
forming two loops instead of one as at present and making a stitch which is a knot
stitch or double lock stitch. For the purpose of connecting and disconnecting the
knot stitch arrangement I form my operating lever in two parts which are connected
together by a small latch which is operated by a knob or button so that by pressing
the knob the lever would become disengaged and the ordinary stitch would then be
produced.
As the feed lever from which my lever obtains its motion takes a circular motion
the fork of the lever only rests upon it so as to take the transverse motion without
any longitudinal movement.
In the case of the "Howe" a pivoted lever is provided which receives its motion
from the main shaft and operates a hooked rod in a horizontal direction for pushing
the shuttle thread past the throat of the machine for the purpose as before
described.
A small knife is provided for cutting the thread when required and is let into a
bole in the bed of the machine and mounted upon a hinged lever under the bed the
other end of which is provided with a knob or button which also rises through the bed
so that when the knife is required the button is pressed down and the knife rises
afterwards falling by its own weight the top and back of the knife being cased square.
so that when down it forms a surface with the bed.
In order that my invention may be clearly understood and more easily carried into
practice I have appended hereunto a double sized sheet of drawings upon which I
have illustrated my improvements applied to Singer machine as also an indication of
their application to a Howe and which will enable any practical person to apply them
to other classes of machines.
Figure 1 is an inverted plan of a Singer machine with my double lock stitch
arrangement attached thereto.
Figure 2 is an enlarged & inverted plan of the lever A.
Figure 3 is a longitudinal section through the lever A on line 1-2 also inverted.
Figure 4 is a diagram plan shewing the one position of the hook a' when engaged
with the shuttle thread.
Figure 5 is a similar diagram plan but shewing the hook a¹ when engaged with
the shuttle thread in another position.
Figure 6 is a diagram of the ordinary stitch.
.

page_text: Figure 7 is a diagram of my knot or double lock stitch.
Figure 8 is a diagram illustrating my application to a "Howe" machine.
Figure 9 is a section through a portion of the base Z shewing my improved
arrangement for cutting the cotton with the knife up.
Figure 10 is a similar section to Figure 9. but shewing the knife down.
In applying my invention to an existing Singer machine as shewn in Figure 1
I pivot the lever A upon the centre a to the bed or table Z of the machine. This
lever A is provided at the one end with the bent fork a* or other arrangement so as to
engage with and receive its cross motion from the bent end b¹ of the feed lever B without
receiving a longitudinal movement, the other end of the pivoted lever A being
connected to the hook a¹ which is pivoted upon the pin a' by the link all in the
manner shown so as to cause the hook a¹ to draw the under or shuttle thread D to the
outside of the throat each time the shuttle E is starting back. As soon as the heel e¹
of the shuttle E has gone past the throat d as shewn in Figure 5 a loop d¹ is thereby
formed through which the needle passes in its descent to form its ordinary stitch.
The hook a' then leaves the shuttle thread and returns to its former position in a
recess formed in the throat or needle plate. After the needle has passed through the
loop of the shuttle thread which was held and formed by the hook a¹ on the outside of
the throat d the shuttle E passes through the ordinary loop that the needle thread
makes on the front side of the throat and thus by forming the ordinary loop as shewn
by Figure 6 & the additional loop, a stitch is obtained as shown by Figure 7 which is
a knot stitch or double lock stitch.
For the purpose of connecting & disconnecting the knot stitch arrangement I form
the lever A in two parts-part A being separate but also mounted to revelve on the
pivot a the two parts A & A being connected together when requiring to be used by
means of the catch a' which is hinged to the part A of the lever and engages in the
slot a in the part A of the lever and is provided with the projection or knob as
which may be operated by any lever or knob arrangement from the outside of the
bed. The catch a' is kept in position by the spring al and when disengaged takes the
position shewn by dotted lines a' and when in such position it will be seen that
the part A of the lever is free to move alone without affecting the part A°.
In the case of the Howe the lever F is provided being pivoted at and receiving
its motion by means of a cam on the main shaft H so as to operate the rod K having
the forked end k¹ so as to push the shuttle thread D past the throat d³ of the
machine as & for the purpose before described.
For cutting the thread when required the small knife M is let into a hole in
the bed Z of the machine & mounted upon the lever m¹ which is pivoted under
the bed at m the other end being provided with the knob or button N so that
when the knife M is required the button N is pressed down & the knife M rises as
shown at Figure 9 afterwards falling by its own weight the top m³ & back m* of
the knife being made square or round so that when down it forms a surface with
the bed.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
1st. In improvements in sewing machines the mode of or means for operating
the shuttle thread substantially as & for the purpose herein described and shewn
upon the drawings.
2nd. The improvements in sewing machines substantially as and for the purpose
herein set forth & shewn upon the drawings.
Dated this 14th day of January 1690.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent for Applicant.