Improvements in Boot Sewing Machinery.
Year: 1890

page_text: Date of Application, 24th Oct., 1890
Complete Specification Left, 24th July, 1891-Accepted, 12th Sept., 1891
PROVISIONAL SPECIFICATION.
Improvements in Boot Sewing Machinery.
I, WILLIAM HENRY DORMAN of The Hawthorns, Newport Road, Stafford
in the County of Stafford, Engineer, do hereby declare the nature of this invention
to be as follows:-
My invention consists in an improvement in those sewing machines which are
used for stitching the soles to the welts of boots, or to that part of the boot, which
takes the place of the welt, and is especially applicable to machines of a general
construction similar to that known as the Goodyear stitcher.
In machines of such a construction which are known as curved needle machines
the needle is made in the form of a portion of a circle and moves to and fro through
It is clamped in a
the work in a path which is a continuation of its own curve.
needle stock which is mounted on a horizontal pivot in the centre of the circular
path of the needle.
The work is supported on a table which has a slotted hole to allow the needle to
pass through.
The thread is laid into the barb of the needle by a looper which moves around
the point of the needle at a suitable time.
The looper is mounted on a lever which is pivotted in a jaw which again is
pivotted in the frame of the machine and the rear end of the lever passes under
the main shaft of the machine and receives a compound motion from suitable cams
on the main shaft.
Owing to the position of the jaw and pivot which carry the looper lever being
necessarily very considerably behind the looper the plane in which the looper
moves around the needle instead of being at right angles or nearly so to the path
of the needle is very much inclined thereto the consequence being that under
certain circumstances the looper is liable to fail to lay the thread fairly into the
barb and the machine misses stitches. Also the above described movement of the
looper is found to interfere with the movement of the pearler-described in former
Letters Patent dated 1st April 1889 No. 5538-and the looper is liable at times to
come in contact with the upper of the boot.
The object of my invention is to obviate these defects which I accomplish in the
following manner.
Instead of using a jaw to carry the looper lever as heretofore I employ a bearing
which I place in a position much more forward, that is to say, nearer to the operator
and lower down.
This bearing is mounted on a pivot so that it is free to turn in a plane parallel
to the plane of the movement of the needle.
The bearing carries in it a short spindle at right angles to the pivot and lying in
an inclined direction.
Upon the front end of this spindle I mount a lever to carry the looper and upon
the rear end another lever which is fitted with cam rolls which work in a cam
with a compound path so that the lever receives a compound motion.
The result of this arrangement is that the looper receives an approximately
circular movement about the needle in a plane nearly at right angles to the
needle path.
... 00 11
Antobor 1890

page_text: COME LULE SPECIFICATION.
Improvements in Boot Sewing Machinery.
I WILLIAM HENRY DORMAN, of The Hawthorns, Newport Road, Stafford,
in the County of Stafford, Engineer 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 :-
My invention consists in an improvement in those sewing machines which are.
used for stitching the soles to the welts of boots or to that part of the boot which
takes the place of the welt and is especially applicable to machines of a general
construction similar to that known as the Goodyear stitcher.
In machines of such a construction, which are known as curved needle machines,
the needle is made in the form of a portion of a circle and moves to and fro through
the work in a path which is a continuation of its own curve. It is clamped in a
needle-stock which is mounted on a horizontal pivot in the centre of the circular
path of the needle.
The work is supported on a table which has a slotted hole to allow the needle to
pass through.
The thread is laid into the barb of the needle by a looper which moves around
the point of the needle at a suitable time. The looper is mounted on a lever which
is pivotted in a jaw which again is pivotted in the frame of the machine and the
rear end of the lever passes under the main shaft of the machine and receives a
compound motion from suitable cams on the main shaft.
Owing to the position of the jaw and pivot which carry the looper lever being
very considerably behind the looper the plane in which the looper moves around
the needle instead of being at right angles or nearly so to the path of the needle
is very much inclined thereto the consequence being that under certain circum-
stances the looper is liable to fail to lay the thread fairly into the barb of the
needle and the machine misses stitches. Also the above described movement of
the looper is found to interfere with the movement of the pearler-described in
former Letters Patent dated 1st April 1889 No. 5538-and the looper is liable
at times to come in contact with the upper of the boot.
The object of my invention is to obviate these defects. This I accomplish in a
manner which will be readily understood by reference to the following description
of the drawings.
Fig. 1. is a front elevation of a portion of a Goodyear stitcher shewing my
improvements applied.
Fig. 2. is a side elevation of the same.
"A" is a portion of the main frame of the machine. "B" and "C" are the
cam shaft stands carrying the cam shaft "D"-or main shaft-on which are
mounted the cams for giving motion to the different parts of the machine. "E" is
the needle clamped in the needle-stock "F" which is mounted on the pivot "G"
in the frame "A." The needle "E" is operated in the usual manner by means of
a toothed segment gearing into the teeth "H" of the needle-stock" F," the
segment receiving motion from one of the cams on the cam shaft "D."
Instead of using a jaw to carry the looper lever as heretofore I employ a
bearing "a" which I place in a position much more forward, that is to say nearer
to the operator, and lower down. This bearing "a" is mounted on a pivot "b"
in the main frame "A" so that it is free to turn in a plane parallel to the plane of
the movement of the needle "E." The bearing "a" carries in it a short
spindle "" at right angles to the pivot "6" and lying in an inclined direction.
Upon the front end of the spindle "C" I mount a looper lever "d" to carry the
looper "e" which is adjustably clamped thereon by means of the screws "f" "f"
The position of the pivot "b" is as nearly as possible in a line tangent to the circle
of the needle path such tangent line touching the circle of the needle path at the
1.

page_text: "
*
point where the barb of the needle "E" is situated at the time when the
looper "e is moving around it. Upon the rear end of the spindle "C" I mount a
cam lever "g" which is fitted with cam rolls "h" and "." Upon the cam
shaft "D"I mount a cam "j" provided with a cam groove "k" in which the
roll "h" works and with a cam surface "1" on which the roll "" runs.
spring "m" keeps the cam lever "g" up to the cam "j."
66 "
A
As the cam "" revolves" by the operation of the machine the groove "k" and
the surface "" impart a compound movement to the lever "g" which is commu-
nicated to the looper and causes the latter to move about the needle "E" in
a plane nearly at right angles to the needle path or in other words nearly in a
plane in which the axis of the needle movement lies. The looper "e" thus lays
the thread, which it carries, fairly into the needle barb, avoids contact with the
pearler and by keeping close to the needle, when passing between the needle and
the boot upper, damage to the upper is prevented. Also I am enabled to keep the
looper guard or shield, when such is used, at a minimum distance from the
path of the needle so as to be able to sew closely to the upper with safety.
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 boot sewing machine which operates with a curved needle, pivotting
the looper lever at a point as nearly as possible in a line tangent to the circle of
the needle path such tangent line touching the circle of the needle path at the
point where the barb of the needle is situated at the time when the looper is
moving around it.
2. In a boot sewing machine operating with a curved needle the use of a
mechanism for operating the looper consisting of a looper lever, spindle, pivotted
bearing, cam lever, rolls and cams substantially as described and for the purpose
specified.
Dated this 22rd dew of T.1- 1001