Improvements in Boot Sewing Machines.
Year: 1889

page_text: Date of Application, 18th Jan., 1889
Complete Specification Left. 17th Oct.. 1889-Accepted, 23rd Nov., 1889
PROVISIONAL SPECIFICATION.
Improvements in Boot Sewing Machines.
WILLIAM HENRY DORMAN of the Hawthorns Newport Road Stafford Engineer
do hereby declare the nature of this invention to be as follows:
My invention is especially applicable to that kind of Sewing Machine employed for
stiteling the sole to the welt or such other part of the boot as takes the place of
the welt and particularly to that machine commonly known as the New Goodyear
Stitcher.
My object is to facilitate the stitching of the soles of boots without the last having
to be withdrawn.
I employ a looper of such a form and with a pipe at such an angle that it will travol
round close to the needle while the thread is being laid into the barb.
I so modify the movement of the looper that it travels round the needle quite
close to it describing a figure as nearly as possible a circle having the contre of the
cross section of the needle as its centre.
After the thread is laid in the barb the looper retreats out of the way till the
next stitch.
I also improve the spring action of the table movement so as to render the pressure
on light or heavy soles when the table is unlocked as nearly equal as possible and
I make use of a long coiled or clock spring to exercise the needful pressure on
the table.
D: 17.1.
T1000
W. H. DORMAN.
COMPLETE SPECIFICATION.
Improvements in Boot Sewing Machines.
I, WILLIAM HENRY DORMAN of the Hawthorns Newport Road Stafford in the
county of Stafford Engineer, 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 has for its object improvements in that class of Sewing Machines
employed for stitching the sole to the welt of a boot, or other such part of a boot as
takes the place of the welt.
The improvements consist in so altering the design and arrangement of certain
parts of the machine as to allow of a boot being stitched without removing it from
the last, and are particularly applicable to the machine commonly known as the New
Goodyear Stitcher, to which machine the accompanying drawings show my invention
as applied.
Fig. 1. is a side elevation shewing a portion of the machine.
Fig. 2. is an elevation viewed from the other side.
Fig. 3. is a front elevation.
Figs. 4 & 5. are views of the Looper.
Figs. 6 & 7. are views of the Looper Cam the latter shewing the development or
periphery unrolled.
Fig. 8. shews the motion of the Looper round the needle.
Like letters indicate the same parts.
A. indicates the frame of the machine which is provided with bearings A' A' for
supporting the cam shaft B. upon which are fixed the cams for actuating the several
moving parts of the machine. O. is the looper cam having the groove c. in which works
the roll and having also the undulating surface upon which runs the roll c³.
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page_text: These two rolls e² and c³ are mounted at right angles to each other upon pins in the
end of the looper lever D to which they give motion as the cam revolves.
The looper lever D is pivotted on a pin d in a jaw d. The jaw d' has a stem
which passes through the portion a of the frame A and is retained by the nut and
washer d. This arrangement allows of a universal movement of the looper lever D.
The stem e slides in a hole in the bearing A¹ and is kept constantly pressed against
the looper lever D by the action of the spring e', this serves to keep the cam roll c³
always in contact with the surface of the cam C.
Upon the forward end of the looper lever D is mounted by means of the screws d³
the looper adjustment piece E which carries the looper F secured to it by the
screws f
and f are slotted to
The holes in the looper adjustment piece E for the screws
allow of adjusting the loopor F in any desired direction.
The thread is brought from the back of the machine and passed through the
looper F in the usual manner and the function of the looper F, by its connections
with the cam C, is to lay the thread around the needle and into the barb.
Owing to the alterations I make in the form of the groove c and in the form
of the surface of the loopor cam C as well as in the form of the looper F the
looper is caused to travel round the needle G. quite close to it in a path as nearly
as possible a circle see Fig. 8. having the centre of the cross section of the needle G
for its centre so laying the thread into the barb of the needle after which the looper
moves backwards and to the left of the operator to the position F¹ so as to be quite
out of the way of the work until the next stitch.
The object of this altered movement of the looper F closely around the needle G.
and the retreating of the looper F. as soon as the thread is laid in the barb of the
needle is that the looper shall not strike the upper of the boot which it would be
liable otherwise to do when the last is in as the last keeps the upper distended in
a direction towards and closely approaching the needle.
The needle G is carried in the ordinary manner in the needle stock g and worked
as usual.
H is the work table which is adjustably mounted on the table segment I pivotted to
the frame A on a pin i.
The machine is provided with the locking slide j, the locking lever k, and the
table opening or hand lever 1, all in the usual manner, the latter being held up by
the volute spring m.
prolong the pin į outwards and mount upon it a barrel n upon which is wound
a long clock spring n'.
The inner end of the spring is attached to the barrel a and the outer end to
the table segment I by means of the peg n³.
In order more casily to wind up the spring I make the pin with a square
end and the set screw serves to cramp the pin when the spring ¹ is
wound up.
The object of the long clock spring is to render the pressure upon the work
as nearly equal as possible whatever the amount of depression of the table may be
whether caused by thin or thick work being operated upon.
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. In a sewing machine employed for stitching the sole to the welt of a boot, or
other such part of a boot as takes the place of the welt, the use of the modified
cam having the groove e and the undulating surface c³ so arranged and designed
as to give by the connections with the lever D, the jaw d' and the piece E a new and
improved movement to the looper F around the needle G. so as to allow of stitching a
boot without removing it from the last substantially as described.
2. In a sewing machine employed for stitching the sole to the welt of a boot, or
other such part of a boot as takes the place of the welt, the use of the long coiled

page_text: clock spring in connection with the table segment I and the locking slide for
the purpose of maintaining a uniform pressure of the table upon the work in all the
different positions of the table caused by the varying thicknesses of the work being
operated upon substantially as described.
Dated this 16th day of October 1889.
W. H. DORMAN.