Improvements relating to Driving, Stopping, and Starting Mechanism for Tool Operating Machines, Sewing Machines, or the like.
Year: 1897

page_text: Date of Application, 20th May, 1897-Accepted, 20th May, 1898
Improvements relating to Driving, Stopping, and Starting
Mechanism for Tool Operating Machines, Sewing Machines,
or the like.
I, REGINALD HADDAN, of the Firm of Herbert Haddan & Co., of 18, Buckingham
Street, Strand, London, Patent Agent, do hereby declare the nature of this inven-
tion, a communication to me from abroad by Achille Prosper Dohis, of 129, Rue
de Neuilly, Paris, Merchant, and in what manner the same is to be performed to
be particularly described and ascertained in and by the following statement:—
This invention relates to a new or improved driving stopping and starting
mechanism for tool operating machines, sewing machines or the like.
In the annexed drawing Fig. 1 is a front elevation, the mechanism being shown
more extended than normally in order to render the drawing clearer. Fig. 2 is a
side view the framing as well as the fly wheel being removed.
Fig. 3 is a detail view indicating in plan the disposition of the brake.
a is the framing and b the table on which rests the machine. 1,1 are hooks
intended so receive the feet. These hooks are made on the under part of
the levers 2 which are in two pieces, connected by a slide 21, provided with a
pressure screw 4 which allows of prolonging or shortening the levers, the desired
length of which is maintained by setting up the screw 4. The levers 2 terminate
at their upper ends each with a fork 3, the arms of which are bent in order to
embrace the arbor 5, on which they turn loosely, letting the said levers oscillate
thereon. 13 is a friction block, which when the lever is pushed backwards wedges
in the groove of the pulley 15 keyed upon the arbor 5, on which is also keyed the
toothed wheel 8 which gears with the pinion 9 keyed on the arbor 10, on which is
keyed a spring lodged in a barrel 18 provided with a toothed rim 11. With this
rim there gears a pinion 12 keyed at the end of an arbor 121 at the other end of
which is keyed a chain wheel 16, connected by chain to the pinion 17, which
operates the fly wheel 28 by means of the arbor 14, on which both are keyed.
On the same arbor 14 is keyed a plain wheel 29. Over this plain wheel is a
shoe 26 mounted on the lever 25, which is pivoted at c, at one of its extremities,
and connected by the other with the inferior branch of a toggle 24, the other
branch of which is fixed by articulation on the framing; 22 is a disk, carrying in
its centre a rod 23 which traverses one extremity of a bent blade 19 fixed by its
other extremity on the framing and operating as a spring, so that when one presses
with the knee against the disk 22 in the direction of the arrow, the rod 23, making
the blade 19 bend, presses on the hinge joint of the toggle 24 and obliges the
latter to open and to push the lever 25, consequently the shoe 26 against the
wheel 29, which it stops as well as the fly wheel 28 with which the wheel 29 is
connected.
31 is a blade operating as a spring, fixed on the framing a perpendicularly to
the free extremity of the blade 19 and arranged so that this latter when bending
can be caught or hooked by its bent extremity (see Fig. 3). 32 is a catch fixed
on the blade 19 and on which the rod 38 takes its support in order to push the

page_text: blade 31 back and to disengage the blade 19, which it does when the lever 34
sinks. This lever mounted on the pivot 35 fixed on the framing, is extended back
in order to come behind the grooved pulley 36 and is connected by the draw rod 37
with an arm 38 beside the grooved pulley 36 and oscillating on the arbor 12¹. 39
is a friction pawl pivoted on the arm 38 which enters into the groove of the
pulley 36 to give an initial impulsion when the lever 42 is moved to the left. 40 is a
screw fixed on the support d and intended to keep the pawl 39 lifted in order to
prevent friction during the working of the machine. 41 is a draw spring. 42 is a
disk mounted on a lever 43 oscillating on the pivot 44 and operating a rod 45
attached on an angular lever 46 which operates the lever 34.
The operation is as follows:-
:-
By
One puts the feet on the books 1 and pushes them alternately backwards.
means of the wedges 13 the levers operate the pulleys 15, the arbor 5, the wheel 8
which operates the pinion 9 and therewith the arbor 10 which winds the spring of
the barrel 18, which in unwinding operates the barrel and by means of the toothed
crown 11 the pinion 12 the arbor 121, moves the chain wheel 16 which operates
by means of the chain the pinion 17, the arbor 14 and the fly wheel 28.
When one wants to stop the apparatus one presses with the knee on the disk 22;
the toggle 24 operated by the rod 23 opens and pushes the lever 25 and the
shoe 26 on the wheel 29 which slackens its movement and consequently that of the
fly wheel 28 and stops completely if the pressure continues on the disk 22.
this moment, the spring 31 catches the spring 19 and the stoppage is
continued.
At
In order to put the machine again in movement one presses with the left knee on
the disc 42. This latter gives, operating the lever 43 which by means of the
rod 45 operates the angular lever 46 which pressing on the lever 34 makes it turn.
The lever 33 enters then between the catch 32 and the spring 31 and disengages the
blade 19 and the shoe 26 recedes from the wheel 29. The lever 34 continuing to
turn rocks the arm 38 and causes the pawl 39 to wedge against the pulley 36 which
it operates putting the whole mechanism into rapid movement; thus the slowness
of starting is avoided. Motion may be carried to the sewing machine or the like
by a belt from a pulley on the shaft 14 or in any other suitable way.
The above describes an example of construction, but the invention is not limited
to the exact details, which may be varied.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed I declare that what I
claim is :-
1. A. driving device for tool operating machines, sewing machines, or the like
comprising the combination of levers 2 provided with friction wedges 3 engaging
in grooved pulleys 15 keyed upon an arbor 5 with a barrel with toothed crown 11
the spring 18 of which is wound by the arbor 5 and operates by means of gearings,
a fly wheel the movement of the said fly wheel being slackened or stopped by a
shoe 26 operating on a wheel 29, the said shoe 26 being operated by a lever 25
operated by a toggle 24 which opens on pressure being given to a disk 22 provided
with a rod 23 mounted on a blade 19 operating as a spring.
2. In a driving device the combination of a dog 39 to operate on a wheel 36
keyed on one of the arbors of the mechanism with the lever 34 for removing the
shoe 26 from the wheel 29.
3. The construction substantially as described allowing the stoppage and the
starting of the apparatus by means of the knees without using the hands.