Improvements in Mechanism for Producing Intermittent Rotary Motion.
Year: 1893

page_text: Date of Application, 23rd Dec., 1893
Complete Specification Left, 17th Aug., 1894-Accepted, 6th Oct., 1844
PROVISIONAL SPECIFICATION.
Improvements in Mechanism for Producing Intermittent
Rotary Motion.
A communication from abroad by GEORGE RICHARD PEARE, of 71, Central
Avenue, Lynn, in the County of Essex and State of Massachusetts, United
States of America, Gentleman.
I, WILLIAM LLOYD WISE, of No. 46 Lincoln's Inn Fields, in the County of
London, Consulting Engineer and Chartered Patent Agent, do hereby declare the
nature of this invention to be as follows:-
The object of this invention is to provide an improved mechanical movement
whereby an intermittent rotary motion may be produced with a graduating speed
before and after the pause. I accomplish this result by the employment of a
planet-gear which is eccentrically connected with the rotary part to be driven.
There are numerous ways of embodying the invention, one of which may be
described as follows:
A stationary gear and a planet-gear of the same number of teeth are arranged so
that the latter may be rotated around the stationary gear.
The planet-gear has a crank-pin whose centre is coincident with the pitch line of
the gear.
A shaft which is to be driven by the movement, has one end journalled in an arm
fast with the stationary gear, the bearing for said shaft being eccentrically located
with respect to the centre of said stationary gear. Said shaft has a crank-arm and
a sleeve is fitted so as to slide on said arm and is formed with a bearing which
receives the crank-pin of the planet-gear.
Motion being transmitted to the planet-wheel, it will rotate around the stationary
gear and at the same time will rotate on its own axis. When the crank-pin is
coincident with the coinciding pitch lines of the two gears, the planet-gear may
move a certain distance while its crank-pin is turning in its bearing on the sleeve
and consequently during this time, the shaft is at a standstill. As the planet-gear
continues around the stationary gear, the crank-pin moves around, and motion is
transmitted to the shaft with gradually increasing speed, the sleeve moving outward
on the crank-arm. The shaft is journalled to one side the centre of the stationary
gear so that when the planet-gear arrives at this journal-point, the crank-pin will be
at its furthest outward position. Consequently at this point the shaft has reached
its maximum speed. As the planet-gear continues, the speed of the driven shaft
gradually decreases as the crank-pin travels inward, and ceases as said pin arrives
at a point coincident with the coinciding pitch lines of the two gears.
The shaft is journalled off the centre of the stationary gear, to increase the
maximum speed of the shaft.
The extensible connection between the crank-pin of the planet-gear and the
driven shaft may be effected by other means than the sliding sleeve on the crank-
arm of the shaft. For example the crank-arm may be formed with an are-shaped
slot to receive the crank-pin. With this construction, the curvature of the slot
permits a longer stop of the driven-shaft, for the crank-pin may move through a
greater are without affecting the crank-arm of the driven shaft. A different
construction for effecting this extensible connection is one in which the crank-arm
of the driven shaft is connected with the crank-pin of the planet-gear by a link
pivotted on said crank-pin at one end and jointed to the crank-arm at the other
end. This forms a toggle-connection between the shaft and the crank-pin of the

page_text: planet-gear, which permits gradual extension of the connection and a graduating
speed of the driven shaft in starting and stopping.
This mechanical movement is of great advantage in shoe-sewing machines for
driving the whirl in the horn as it not only supplies an intermittent rotary motion
but also a graduation of speed before and after the pause.
Dated this 23rd day of December 1893.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.
COMPLETE SPECIFICATION.
Improvements in Mechanism for Producing Intermittent
Rotary Motion.
A communication from abroad by GEORGE RICHARD PEARE, of 71, Central
Avenue, Lynn,.in the County of Essex and State of Massachusetts, United
States of America, Gentleman.
I, WILLIAM LLOYD WISE, of 46 Lincoln's Inn Fields, in the County of
London, Consulting Engineer and Chartered Patent Agent, 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 :-
The object of this invention is to provide an improved mechanical movement
whereby an intermittent rotary motion may be produced with a graduating speed
before and after the pause. 1 accomplish this result by the employment of a
planet-gear which is eccentrically connected with the rotary part to be driven.
There are numerous ways of embodying the invention, and I have not here
attempted to illustrate all the constructions by which it may be carried out.
accompanying drawing, three different forms are illustrated.
In the
Figure 1 shows the invention applied to a shoe sewing machine of the McKay
type, only a portion of the machine being illustrated.
Figure 2 shows an elevation of the opposite side of the upper part of the
machine.
Figure 3 shows an edge view of the parts shown in Figure 2.
Figure 4 shows a side or edge view of the mechanical movement on an enlarged
scale.
Figure 5 shows a sectional view taken on line 5-5 of Figure 2.
Figure 6 shows an end view with the driven shaft in section, and the parts as
they appear when said shaft is at a standstill.
Figure 7 shows a similar view, with the parts as they appear when the driven
shaft moves at the highest speed.
Figure 8 shows a similar view to Figure 6, of a modification; and
Figure 9 shows a similar view of another modification.
The mechanical movement comprises a stationary gear a, and a planet-gear of
the same number of teeth as and meshing with the stationary gear. This planet-
gear may be arranged in any suitable manner so as to be rotated around the
stationary gear. In the present instance, it is carried by a crank-arm fast
with a bevel-gear to which motion may be transmitted in any suitable manner.
The planet-gear has a crank-pin c whose centre is coincident with the pitch line
of the gear, as illustrated by broken lines in Figure 5.
A shaft d, which is to be driven by the movement, has one end journalled in an
arin e fast with the stationary gear a, the bearing for said shaft being eccentrically
located with respect to the centre of said stationary gear. Said shaft has a
crank-arm d, and a sleeve is fitted so as to slide on said arm and is formed with
a bearing which receives the crauk-pin e of the planet-gear.

page_text: Motion being transmitted to the planet-wheel, it will rotate around the stationary
gear, and at the same time will rotate on its own axis. When the crank-pin c is
coincident with the coinciding pitch lines of the two gears a and b, as illustrated in
the drawings, the planet-gear may move from the position shown in full lines in
Figure 5 to that shown in broken lines in said figure, while its erank-pin is turning
in its bearing on the sleeve f, and consequently during this time the shaft d is at
a standstill. As the planet-gear continues around the stationary gear, the crank-
pin e moves around in the direction indicated by the arrow in Figure 5, and motion
is transmitted to the shaft d with gradually increasing speed, the sleeve moving
outward on the crank-arm d'. The shaft d is journalled to one side of the centre
of the stationary gear a, so that when the planet-gear arrives at this journal-point,
as shown in Figure 7, the crank-pin c will be at its furthest outward position.
Consequently at this point the shaft d has reached its maximum speed. As the
planet-gear continues, the speed of the driven shaft gradually decreases as the
crank-pin travels inward, and ceases as said pin arrives at a point coincident with
the coinciding pitch lines of the two gears.
By journalling the shaft off the centre of the stationary gear, a higher maximum
speed of the shaft is possible than if the centre of rotation of said shaft were
coincident with the centre of the stationary gear.
The extensible connection between the crank-pin of the planet-gear and the
driven shaft may be effected by other means than the sliding sleeve on the crank-
arm of said shaft. In Figure 8, the crank-arm d is formed with an arc-shaped
slot which receives the crank-pin c. With this construction, the currature of the
slot permits a longer stop of the driven shaft, for the crank-pin may move through
a greater arc without affecting the crank-arm of the driven shaft.
Figure 9 shows
a different construction for effecting this extensible connection, in which the crank-
arm of the driven shaft is connected with the crank-piu of the planet-gear by a
link pirotted on said crank-pin at one end and jointed to the crank-arm at the
other end. This forms a toggle connection between the shaft and the crank-pin of
the planet-gear, which permits a gradual extension of the connection and a
graduating speed of the driven shaft in starting and stopping.
This mechanical movement is of great advantage in shoe-sewing machines for
driving the whirl in the horn, as it not only supplies an intermittent rotary
motion, but also a graduation of speed before and after the pause.
Figures 1, 2, and 3 show a manner of applying the movement to a sewing
machine of the McKay type. The shaft d is geared to the whirl-spindle i, which
connects with the whirl through the horn p, and the bevel-gear is connected with
the source of power so as to receive a continuous rotary motion.
A convenient arrangement for connecting the bevel-gear with the driving-gear
of the machine is illustrated in the drawings. A bracket o is fastened to the
frame of the machine, and has a bearing for a gear o meshing with a gear of of
the machine and also meshing with a bevel-gear o³ on the upper end of a shaft or
spindle of whose lower end is supported in a bearing o clamped to the frame of the
machine, and carries a bevel-gear of meshing with the bevel-gear b³.
It is evident the movement may be utilized in a large variety of machines.
It is to be understood that I do not limit myself to any specified construction
for carrying out the invention, as it may be embodied in numerous forms.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, it is declared that what is
claimed is:
1. A mechanical movement comprising a stationary gear; a planet-gear in
mesh therewith and having a crank-pin whose centre is coincident with the pitch
line of the said planet-gear; and a rotary driven part suitably connected with the
crank-pin of the planet-gear, whose centre of rotation is outside of the centre of
the stationary gear and included within the line of travel of the said crank-pin.
2. A mechanical movement comprising a stationary gear; a planet-gear in resh

page_text: therewith and having a crank-pin whose centre is coincident with the pitch line of
the said planet-gear; a rotary driven part having a crank-arm, and a sleeve movable
longitudinally on said crank-arm and having a bearing which receives the crank-
pin on the planet-gear.
Dated this 17th day of August. 1894
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.