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

page_text: Date of Application, 27th July, 1894
Complete Specification Left, 29th Apr., 1895-Accepted, 15th June, 1895
PROVISIONAL SPECIFICATION.
Improvements in Transmitters, specially applicable for Sewing
Machines.
I, JOHN WHITE, Engineer, The Sewing Machine Syndicate, Wellingborough
in the County of Northampton do hereby declare the nature of this invention to
be as follows:-
This invention for improvements in transmitters specially applicable for sewing
machines has for its object to provide a transmitter that can be readily fixed in
any desired position so that one transmitter shall be applicable to all classes of
driving, that can be easily kept in gear without useless expenditure of power, that
shall leave the machine perfectly free to be examined and that shall enable the
speed to be varied, be simple, efficient, and not liable to get out of order.
The transmitter is connected to the head of the machine by belt gearing and
can readily be fixed in different ways according to the arrangement of the power
shafting. Being independent of the head of the machine, the main spindle of the
machine is not liable to be jammed and the bearing can be made longer; the belt
driving the machine is only in motion when the machine is running and can be taken
off without danger when desired to examine the machine; the vibration of the
transmitter is not transmitted to the machine; and the end play of the transmitter
shaft can readily be taken up.
The transmitter is mounted in an independent frame having one side edge adapted
to be received and secured to a channel in the end standard of the bench or to a
channel bracket adjustable on a prop secured to the floor and to the underside of
the bench. The top edge of the frame is adapted to be secured to an inclined
bracket that can be secured to the ceiling or underside of the bench without being
in the way of the belting.
The pulley on the head of the machine is connected by a belt to a pulley keyed
on a hollow shaft mounted in a single bearing in which the end thrust is taken up
by a ball bearing. A small screw working in a circumferential groove in the
hollow shaft prevents it from leaving its bearing and thus the balls from dropping
out. The outer face of this pulley is provided with a groove to receive a leather
friction ring. The driving pulley having two or more grooves for different speeds
is fixed by means of a screw on a shaft bearing at one end in the hollow shaft and
at the other end in a fixed bearing. The shaft is moved end wise to force the inner
face of the driving pulley against the ring of leather on the driven pulley by a
lever fulcrummed on the frame and provided with an arm having an adjustable
stop bearing against the end of the shaft. The lever is operated by a pedal and
is drawn back by a spring. A piece of leather attached to the lever engages in
the V groove in the driven pulley when the lever is released and acts as a
brake.
In a modification the lever operates a sliding wedge acting on a roller on the
end of a supplementary lever having an adjustable stop bearing against the end of
the shaft. In this arrangement the vibration of the transmitter is not communicated
to the foot of the operator.
The shafts are oiled automatically by wicks dipping in oil and bearing on the

page_text: shafts in the centre of their bearings, a hole being pierced through the hollow
shalt so that the centre shaft is also lubricated at this point.
A suitable guard bolted to the frame is provided for the pulleys.
TL
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1
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
Improvements in Transmitters, specially applicable for Sewing
Machines.
JOHN WHITE, of The Sewing Machine Syndicate, Wellingborough, 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 transmitters specially applicable for sewing
machines has for its object to provide a transmitter that can be readily fixed in
any desired position so that one transmitter shall be applicable to all classes of
driving, that can be easily kept in gear without useless expenditure of power that
shall leave the machine perfectly free to be examined and that shall enable the
speed to be varied, be simple, efficient, and not liable to get out of order.
The transmitter is connected to the head of the machine by belt gearing and can
readily be fixed in different ways according to the arrangement of the power
sbáfting. Being independent of the head of the machine the main spindle of the
machine is not liable to he jammed and the Learing can be made longer; the belt
driving the machine is only in motion when the machine is running and can be
taken off without danger when desired to examine the machine; the vibration of
the transmitter is not transmitted to the machine and the end play of the
transmitter shaft can readily be taken up.
The transmitter is mounted in an independent frame having one side edge
adapted to be received and secured in a channel in the end standard of the bench
or to a channel bracket adjustable on a prop secured to the floor and to the under-
side of the bench. The top edge of the frame is adapted to be secured to ap
inclined bracket that can be secured to the ceiling or underside of the bench
without being in the way of the belting.
The pulley on the head of the machine is connected by a belt to a pulley keyed
on a hollow shaft mounted in a single bearing in which the end thrust is taken up
by a ball bearing. A small screw working in a circumferential groove in the
hollow shaft prevents it from leaving its bearing and thus the balls from dropping
out. The outer face of this pulley is provided with a groove to receive a leather
friction ring. The driving pulley having two or more grooves for different speeds
is fixed by means of a screw on a shaft bearing at one end in the hollow shaft and
at the other end in a fixed bearing. The shaft is moved end wise to force the inner
face of the driving pulley against the ring of leather on the driven pulley by a
lever fulcrumed on the frame and provided with an arm having an adjustable stop
bearing against the end of the shaft. The lever is operated by a pedal and is
drawn back by a spring. A piece of leather attached to the lever engages in the
V groove in the driven pulley when the lever is released and acts as a brake.
In a modification the lever operates a sliding wedge acting on a roller on the
end of a supplementary lever having an adjustable stop bearing against the end of
the shaft. In this arrangement the vibration of the transmitter is not communicated
to the foot of the operator.

page_text: The shafts are oiled automatically by wicks dipping in oil and bearing on the
shafts in the centre of their bearings, a hole being pierced through the hollow
shaft so that the centre shaft is also lubricated at this point.
A suitable guard bolted to the frame is provided for the pulleys.
In the accompanying sheets of illustrative drawings:
Fig. is a sectional elevation of a transmitter constructed according to this
invention, and Fig. 2 is a plan, and Fig. 3 an end elevation of the same.
Figs. 4 and 5 are side and end elevations respectively of a bracket for securing
the transmitter to the underside of a bench.
Figs. 6 and 7 are elevation and plan respectively of a bracket for securing the
transmitter to a prop secured to the floor and underside of the bench.
The top edge A. of the transmitter frame is adapted to be secured to the face B:
of the bracket shown in Figs. 4 and 5 and the top face C of this bracket, can be
bolted to the underside of the bench on which the machine to be driven is fixed.
The side edge D of the transmitter frame is adapted to be received and secured in
a channel in the end standard of the bench carrying the machine to be driven or
to a special prop extending between the floor and bench. The said edge D is
also adapted to be secured to the face E of the bracket shown in Figs. 6 and 7
provided with a square socket F adapted to slide on a square prop extending
between the floor and the underside of the bench. The bracket is fixed at the
desired part of the prop by means of the screw G.
The driven shaft H of the transmitter carrying the pulley I from which the
machine is driven is hollow and forms a bearing for the driving shaft J. It is
supported in a bearing L in the main frame and any end thrust is taken up by the
balls M. The small screw N working in a circumferential groove in the shaft H
prevents it from leaving its bearing when the shaft J is removed and thus the balls
from dropping out. The outer face of the pulley 1 is provided with a groove to
receive the leather friction ring 0.
The driving shaft J carries the driving pulley P having two or more steps or
grooves for different speeds and fixed on the shaft by means of a set screw so that
its position can readily be adjusted. The driving pulley P is provided with an
annular face opposite the leather ring O so that in forcing the driving shaft J
end wise the annular face comes in contact with the leather ring O and causes the
pulley to be driven.
The shaft J is moved endwise by a lever R having an adjustable stop S on one
end bearing against the end of the driving shaft. The other end of the lever R is
provided with a roller working in a race T' in a wedge T sliding on the fixed
bar W. The wedge T is operated by means of a roller T2 carried by a pin in the
wedge T working in a groove X3 in the lever X fulcrummed at X' and connected
at X2 to a pedal lever so that it can be actuated by the foot of the operator.
A spring Y ensures the return as soon as the pressure of the foot of the operator
is removed. The vibration of the transmitter in this arrangement is not transmitted
to the foot of the operator. A piece of leather X attached to the lever X
engages in the V groove in the driven pulley I when the lever X is released and
acts as a brake.
The shafts are oiled automatically by wicks Z dipping in oil in the vil
reservoirs Z and bearing on the shafts in the centres of their bearings, a hole H¹
being pierced through the hollow shaft so that the driving shaft is also lubricated
at this point. The guard A¹ bolted to the frame is provided for the driving
pulley.
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. The arrangement of the frame of the transmitter substantially as described
with reference to the drawings so that one frame is adapted to be fixed in various
nsitions

page_text: 2. In a transmitter the arrangement of the co-axial shafts so that the hollow
driven shaft forms a bearing for the driving shaft and the two are connected by a
relative end wise movement, substantially as described.
3. In a transmitter the arrangement of the hollow driven shaft with its ball
bearing to take up end thrust and arranged to form a bearing for the driving shaft
substantially as described.
4. In a transmitter the arrangement for operating the clutch mechanism
consisting of a lever operated from the foot and operating by means of a wedge, a
second lever acting on the clutch mechanism substantially as described for the
purpose specified.
5. The improvements. in transmitters substantially as described. with reference.
to the drawings.
Dated this 27th day of April 1895.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.