Improvements in the Construction of Sewing Machines.
Year: 1891

page_text: Date of Application, 1st Aug., 1891
Complete Specification Left, 2nd May, 1892-Accepted, 11th June, 1892
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Sewing Machines.
I, WILLIAM JACKSON, of 413 Battersea Park Road, London S.W., Engineer
do hereby declare the nature of my said invention to be as follows:-
The object of my invention is to manufacture improved machines for sewing the
soles of boots and shoes.
I use an ordinary standard provided with a foot or feet for retaining the same in
a vertical position. This standard is formed with bearings and other provisions for
fitting the various appliances connected therewith, the upper end being formed with
a rectangular frame. In or on this frame I fit a horizontal shaft and a vertical
shaft, each fitted with bevel gear, so as to revolve simultaneously. At one end of
the horizontal shaft a flywheel is fitted, having an outside crank pin, connected, by
means of a rod, with a treadle-bar and treadle, whereby the mechanism is driven.
The lower end of the vertical shaft carries a bevel wheel, which drives a short
horizontal shaft fitted in a frame attached to or forming part of the standard.
Another bevel wheel is fitted to the outer end of the last mentioned shaft, which
drives, by the same means a double toothed bevel wheel fitted in suitable bearings.
This latter bevel wheel drives the hollow looper spindle, by means of a horizontal
shaft and suitable bevel gear. The last mentioned horizontal shaft with its frame
is capable of rotating upon or about the centre of the bevel wheel which acts as its
driver, carrying with it the looper spindle.
The horizontal driving shaft is fitted with a disc carrying a pin (or crank) which
works in a slotted cam fitted to the needle bar; the curve of the slot being such as
will allow the necessary
"dwell" to the needle bar, during about half a revolution
of the driving shaft.
At the back of the crank pin disc, on the driving shaft, I fit a cam, of such a form
as to operate the presser foot, by means of a slotted lever, the upper end of which
is fitted with a spring to retain it in contact with the cam, and also with a screw bolt
for regulating the length of the stitch.
When the needle bar descends an attachment thereto acts upon a lever in such a
manner that the presser foot is raised against the power of the spring of the presser
foot.
A lug and screw bolt are attached to the presser foot for regulating its motion in
accordance with the thickness of the material operated upon.
Dated 1st August 1891
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.
COMPLETE SPECIFICATION.
Improvements in the Construction of Sewing Machines.
I, WILLIAM JACKSON, of 413 Battersea Park Road, London, S.W., Engineer,
do hereby declare the nature of my said invention and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :-
The object of my invention is to manufacture improved machines for sewing the
soles of boots and shoes.
I use an ordinary standard provided with a foot or feet for retaining the same in
a vertical position. This standard is formed so as to furnish bearings and other

page_text: provisions for fitting the various appliances connected therewith. The upper end
is fitted with a rectangular frame which carries the driving gear and other operating
parts in connection therewith.
And in order that my said invention may be particularly described and
ascertained, reference is hereby made to the accompanying drawings, in which
similar figures of reference indicate corresponding parts.
Fig. 1 is a side elevation, partly in section. Fig. 2 is a front view of the upper
part and Fig. 3 is an elevation, partly in section, showing the method of actuating
the presser foot.
1 is the upper part of the standard. 2, 2, is a rectangular bracket, cast in one
with the standard. 3 is the supporting arm for the revolving looper spindle 4;
the supporting arm 3 pivoting upon the bolt 5. 6 is a rectangular frame, bolted
to or cast in one with the standard 1. 7 is a horizontal driving shaft, mounted
in the frame 6. 8 is a fly-wheel fast on the horizontal shaft 7. 9 is a crank pin,
worked by the connecting rod 10, attached to a pedal.
The shaft 7 may be driven as shown, or by steam or other motive power.
11 is a bevel wheel, fast on the shaft 7. 12 is a bevel wheel fast on the
vertical shaft 13. 14 is another bevel wheel fast on 13. 15 is a bevel wheel
fast on the shaft 16, and 17 is another bevel wheel fast on 16. 18 is a double
bevel wheel, loose on the bolt 5. 19 and 21 are two bevel wheels fast on the
shaft 20, the wheel 21 being in gear with the bevel wheel 22, fast on the hollow
looper spindle 4. By means of this gearing the rotation of the shaft 7 causes
the simultaneous rotation of the looper spindle 22, at whatever angle the arm 3
may be placed relatively to the bracket 2. 23 is a circular disc fast on the
shaft 7. A crank pin 24 is fitted to the disc 23, which pin works in a slotted
cam plate 25, fitted to the needle bar 26, the curve of the slot being such as
will allow the necessary "dwell" to the needle bar during about half a revolu-
tion of the shaft 7. 27 is a cam attached to the back of the disc 23, and
revolving with the shaft 7; the form of which is shown by dotted lines in
Fig. 2, and in section in Fig. 3. As the cam 27 rotates the lever 29 receives
a to and fro motion, contact with the cam being secured by the spring 32. The
lever 29 is pivoted to the frame 6 at 30. The lower end is slotted to receive
a pin 31, fixed to the presser bar 35. 33 is a screw bolt for regulating the
length of the stitch. The lower end of the presser bar, and with it the presser
foot 28 thus receive the necessary regulated motion. The upper end of the
presser bar is slotted at 37 to receive the fixed pin 38. The presser bar works
in slots or grooves formed in the frame 6, as shown.
34 is a curved lever pivoted at 36 to the presser bar. 39 is a fixed fulcrum
with which the lever 34 is constantly in contact. 40 is a roller attached to
the upper end of the needle bar 26, also in contact with the lever 34. 41 is a
spring, the upper end of which is attached to the pin 36, and the lower end to
the regulating screw 42. When the needle bar descends the roller 40 carries
down the lever 34 and raises the presser bar and foot against the power of the
spring 41, and when the needle bar is again raised the presser bar is drawn
downwards by the power of the spring 41. 43 is the cast off for protecting
the preceding loop of the sewing thread against being caught by the hook.
The cast off 43 is fitted with a spring 44. The upper end of this spring is in
contact with the flange of the cam plate 25, and the lower end presses upon a
pin 45. The cast off 43 passes through guide holes in the frame 6, and also
through the projecting flange of the cam plate 25. The cast-off is shown in its
lowest position in Fig. 2; the cam plate 25 holding it down until the cam plate
is raised by the pin 24. The spring 44 then expands until the cam plate
impinges against the pin 46, raising the cast-off to its highest position. The
lower guide hole in the frame 6 is provided with a screw 47, and is lined with
leather to produce a certain amount of friction, and impart the necessary rest
until the thread is released from the barb of the needle. 48 is the lifter.

page_text: 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. In sewing machines for the purposes aforesaid, the combination with an ordinary
standard, of the horizontal driving shaft 7 mounted in the rectangular frame 6: the
several bevel wheels 11, 12, 14, 15, 17, 18, 19, 21, and 22, mounted on their respective
shafts, and severally in gear for the purpose of, driving the looper spindle 4, substan-
tially as herein before described and illustrated by Fig. 1 of the drawings.
2. In sewing machines for the purposes aforesaid, the combination with the
horizontal driving shaft 7, of the disc 23, crank-pin 24, slotted cam-plate 25, and
needle bar 26, severally operating substantially as herein before described and
illustrated by the drawings.
3. In sewing machines for the purposes aforesaid, the combination with the
horizontal driving shaft 7 of the cam 27, slotted lever 29, and presser bar 35, severally
operating substantially as herein before described and illustrated by the drawings.
4. The general construction, arrangement and combinations of the several and
respective parts, together constituting my invention of improvements in the construc-
tion of sewing machines, substantially as herein before described and illustrated by
the drawings.
D 20th A 1 1000'
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.