Improvements in Power Transmitters, specially applicable for Sewing Machines.
Year: 1894

page_text: Date of Application, 19th Oct., 1894
Complete Specification Left, 19th July, 1895-Accepted, 24th Aug., 1895
PROVISIONAL SPECIFICATION.
Improvements in Power Transmitters, specially applicable for
Sewing Machines.
1, JOHN WHITE, Engineer, of The Sewing Machine Syndicate, Welling-
borough, in the County of Northampton, do hereby declare the nature of this
invention to be as follows:-
This invention for improvements in power transmitters specially applicable for
sewing machines relates to transmitters of that class in which the power is
transmitted only when the transmitter is kept in gear by the pressure of the foot
of the operator, and has for its object to prevent the vibrations passing through the
transmitter from being transmitted to the foot of the operator, and consists.
essentially in operating, by means of a cam surface operated from the pedal lever,
the lever putting the transmitter in gear and applying the brake to the machine
when released.
The lever and cam are operated in the reverse directions by suitable springs,
and the whole apparatus may be fixed to the head end of the machine.
Dated this 19th day of October 1894.
WHEATLEY & MACKENZIE,
40 Chancery Lane, London, W.C., Agents.
Improvements in Power Transmitters, specially applicable for
Sewing Machines.
I, JOHN WHITE, Engineer, of The Sewing Machine Syndicate, Welling-
borough, in the County of Northampton, 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 for improvements in power transmitters specially applicable for
sewing machines; relates to transmitters of that class in which the power is
transmitted only when the transmitter is kept in gear by the pressure of the foot
of the operator, and has for its object to prevent the vibrations passing through
the transmitter from being transmitted to the foot of the operator, and consists
essentially in operating, by means of a cam surface operated from the pedal lever,
the lever putting the transmitter in gear and applying the brake to the machine
when released.
The lever and cam are operated in the reverse directions by suitable springs,
and the whole apparatus may be fixed to the head end of the machine.
In the accompanying sheet of illustrative drawings:-Fig. 1 is a side elevation
of the head end of a sewing machine fitted with a power transmitter constructed
according to this invention, and Fig. 2 is an end elevation of the same.
The head of the inachine is provided with the usual friction clutch consisting of
the pulley a, keyed on the main shaft of the machine and provided with the

page_text: friction surface c, and the belt pulley d mounted loosely on the main shaft and
provided with a leather ring e, the belt pulley being forced end wise to gear the
belt pulley to the fixed pulley a to drive the shaft b.
The belt pulley d has fixed on its end, the rounded projection and is moved
endwise by means of the lever g fulcrummed at h on a bracket fixed to the end of
the machine frame. The other end of the lever 9 is forced against the cam
surface by the spring m.
The cam surface is cut on the end of the lever n that
is connected by the link o to the usual pedal lever. The spring p serves to pull
the lever n back after it has been depressed by the pedal lever. The transmitter
can be adjusted by means of the small screw t.
On depressing the pedal lever, the can surface is turned and forces outwards
the end of the lever g so that its inner end is forced inwards to put the parts e
and e in firm contact. The lever is also provided with the brake surface r that
comes against the hand wheel & to stop the machine when the clutch is out
of gear.
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 power transmitter for sewing machines operating by means of a cam
surface operated from the pedal lever, the lever putting the transmitter in gear
substantially as described for the purpose specified.
2. The improvements in power transmitters substantially as described with
reference to the drawings.
Dated this 19th day of July 1895.
WHEATLEY & MACKENZIE,
40 Chancery Lane, London, W.C., Agents.