IMPROVEMENTS IN BUTTON HOLE STITCHING MACHINES
Year: 1887

page_text: Date of Application, 8th Mar., 1887
Complete Left, 8th Nov., 1887
Complete Accepted, 16th Dec., 1887
THOMAS WILLIAM MARSHALL 34 Herbert Road Stockwell Road Clapham S.W. in
the County of Surrey Engineer, I do hereby declare the nature of my invention for
IMPROVEMENTS IN BUTTON HOLE STITCHING MACHINES to be as follows:-
My improvement consists in increased efficiency of apparatus, reduction of wearing
parts also to over come the viberation or jerking motion at high speeds either for a
machine which motion is altered by hand or altered by the machine automatically.
For this purpose I use a tooth wheel having two cams or inclined planes formed
on opposite sides of this tooth wheel. This is driven by a pinion from the main
shaft and is arranged to give a half or full motion to a lever which gives side or
transverse motion to the work table.
For this purpose the lever has a small roller on one end always running on one of
the inclined planes or cams this gives the half motion.
The full motion is given by throwing a large roller on to the other inclined plane
or cam this large roller is moved over by hand or by the machine automatically.
When this large roller is not running on the inclined plane it runs on a true
surface either above or below this inclined plane or cam for the purpose of continuing
the half or full stroke.
The lever which gives side motion to the work table is made straight on the
machine worked by hand but on the automatic machine 1 prefer to make this lever
at right angles. In both cases this lever is so arranged that I can lengthen or
shorten it and by so doing subdivide the half or full motion.
This gives a much greater control of motion done hitherto.
This cam and lever motion is applied to any button hole stitching machine or as
an attachment to an ordinary sewing machine.

page_text: Improvements in Button Hole Stitching Machines.
1 THOMAS WILLIAM MARSHALL 88 Pages Walk Old Kent Road S.E. Engineer
I 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:-
My improvement consists in increased efficiency of apparatus; reduction of
wearing parts, also to over come the viberation or jerking motion at high speeds
either for a machine which is altered by hand or altered by the machine automatically.
My said invention is illustrated in the accompanying drawings in which Figure 1
Sheet 1 is a plan showing how the tooth cam wheel is fixed to Button hole stitching
machine.
Figure 2 Sheet 2 elevation of one side of cam wheel.
Figure 3 Sheet 2 plan of cam wheel.
Figure 4 Sheet 2 elevation of the other side of cam wheel.
Like letters indicate corresponding parts throughout the drawings.
a is the main shaft which gives motion to the stitching part of machine also
to a' which is a pinion fixed to this shaft and giving motion to the wheel having
cams or inclined planes on its sides. The wheel & can slide along its supporting pin.
This wheel may be driven by tooth or by friction gearing.
On one side of this wheel is formed a cam or inclined plane for the purpose
of giving half motion to lever c and carriage d.
One end of this lever has a small roller which is kept pressing against the side
of wheel by a spring acting on the carriage d and runs up and down the inclined
plane or cam 6'. The other end is held in a slot d in the carriage d this carriage d
slides on guides and d³ and supports the workplate.
The lever c is so arranged
at one end so that it may give a long or short motion to carriage d by moving
centre on lever c to hole c which gives a longer or shorter motion to carriage d.
This gives greater control over machines than has hitherto been obtained.
The other side of this wheel has two truc surfaces upper and lower band &³
connected by an inclined plane &.
A large roller e which is caused to revolve by contact with the side of wheel b
runs freely on a fixed pin f. This roller e is moved to and fro by a lever working
in recess for the purpose of giving half or full motion.
When the large roller e is running on the true plane it gives half motion to
lever c and carriage d but when the large roller e is by means of a lever working in
the recess caused to travel to the upper plane 63 it gives a full motion.
The lever c may be made either as shown or any other convenient form.
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.
The arrangement of the wheel b with its true surfaces and inclined planes or cams
for actuating the lever c and carriage d for the aforesaid purpose.
Dated this 8th day of November 1887.