Improvements in Sewing Machines.
Year: 1890

page_text: Date of Application, 14th Mar., 1890
Complete Specification Left, 13th Dec., 1890-Accepted, 17th Jan., 189
PROVISIONAL SPECIFICATION.
Improvements in Sewing Machines.
I, DAVID RUSSELL DAWSON, Baltic Chambers, Dundee, Merchant, do hereby
declare the nature of this invention to be as follows:-
This invention relates to improvements in sewing machines and is more particularly
applicable to that kind of sewing machine known as "over-edge" sewing machines.
My said invention has for its object to improve and simplify the mechanism for
driving the needle of sewing machines making an over-edge stitch. In carrying out
my invention I employ an internal driver for operating and driving the needle. The
needle is coiled round this driver and has formed in it one or more slots or notches.
On the external surface of the driver there are formed one or more projections for
engaging in the slots in the needle. One or more projections on the internal driver
may be arranged to act as a thimble on the end or head of the needle to push it
forward. I also employ one or more external drivers having each one or more
projections theroon to catch up and carry on the needle by engaging in one or more
slots or notches formed externally on the needle. The needle may be of less than one
turn of the circle of the driver or more than one turn in which case it would be
formed into a helix. The diameter of the circle to which the needle is formed is
rather greater than that of the driver so that as the driver turns round at a certain
part of the revolution the projections on the driver disengage from the notches in the
needle and at certain other parts they engage again and the notches on the internal
and external drivers may be so arranged that one notch on the internal driver and one
notch on the external driver are always operating at the same time.
The needle may be square, round, or triangular or of other suitable section and may
be supported by guide plates or guide pulleys or guide plates and guide pulleys.
These pulleys and guide plates are provided with grooves which may be V or other
suitable shape according to the section of the needle. The grooves in the pulleys
shall be of such shape as may be found most suited to assist in driving and guiding
the needle.
Datod this 13th day of March 1890
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents..
COMPLETE SPECIFICATION.
Improvements in Sewing Machines.
1, DAVID RUSSELL DAWSON, of Baltic Chambers, Dundee, North Britain,
Merchant, do hereby declare the nature of this 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 improvements in sewing machines, and is more particularly
applicable to that kind of sewing machine known as over-edge sewing machines.
My said invention has for its object to improve and simplify the mechanism for
driving the needle of sewing machines, making an over-edge stitch. In carrying out
my invention I employ an internal driver for operating and driving the needle. The
needle is coiled round this driver, and has formed in it one or inore indentations. On
the external surface of the driver there are formed one or more projections for
engaging in the indentations in the needle. One or more projections on the internal
driver may be arranged to act as a thimble on the end or head of the needle to push
it forward. The needle may be of less than one turn of the circle of the driver. The
diameter of the circle to which the needle is formed is rather greater than that of the
ID 677

page_text: driver and as the driver turns round at a certain part of the revolution the projections
on the driver are caused to disengage from the indentations in the needles, and at
certain other parts they engage again.
The needle may be square, round or triangular or of other suitable section and is
provided with a circular path in which it is caused to move by the action of the
driver.
In order that my invention may be properly understood and readily carried into
effect have hereunto appended an explanatory sheet of drawings, in the several
figures of which corresponding parts are marked with the same letters of reference.
Figure 1 is a plan of part of the sewing machine.
Figure 2 is a section of the needle box and driver.
Figure 3 is an elevation of the ring forming the path for the needle with the cover
which constitutes one side of the path.
Figure 4 is a section of an alternative needle driver.
The machine is of the kind-described in Hunt's Specification No. 2856 of 1878, and
the general arrangement is similar, but instead of driving the needle by the helicone
needle driving arrangement as described in Hunt's Specification, I employ an internal
driver.
A Figure 1 is the first motion shaft, which by means of the toothed wheels drives
the shaft B attached to the needle driver. The needle driver C, Figure 2, is attached
to the shaft B, and has got pins or projections c, c, c, c, which engage in indentations
formed on the inner surface of the needle D and drive the needle. The number of
pins in the driver may be varied. I have shewn four which I find to answer well.
These pins or projections are placed in receptacles E formed in the driver, and are
-pressed-out-of the springs F to keep them pressing into the indentations in the needles.
The form of spring which I prefer is voluto spring as shewn in the drawings but
other forms may be used. At the place G where the needle passes through the cloth.
the pins have to disengage from the needle. This is accomplished by forming a
shoulder c', Figure 5. on the pin which comes in contact with an inclined surface H
attached to the ring H' in which the path of the needle is formed. The ring H' is
fixed to the flange or boss H². As the shoulder moves along the surface the pin is
removed from the needle, and its spring becomes compressed, the needle is then at
liberty to go through the cloth. On the pin leaving this surface H it again engages
with the needle.
An alternative method of disengaging the pin at the place where the needle passes
through the cloth is shewn at Figure 4. In this case the driver is not concentric
with the needle path. The centre of the driver is so arranged that as the pins
approach the place where the needle passes through the cloth they leave the needle
and afterwards re-engage with the needle on the other side of the cloth.
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 :-
1. The general arrangement of parts forming an internal driver for the needle of
an over-edge sewing machine, substantially as described.
2. The internal driver having pins pressed out by springs to keep them engaged in
indentations of the needle, which pins are disengaged from the needle at the place
where the needle passes through the cloth, substantially as described.
3. The methods described for disengaging the pins from the needle at the place
where the needle passes through the cloth, substantially as described.
Dated this 12th day of December 1890.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents.