Improvements in Gearing for Transforming a Continuous Rotary Movement into an Intermittent Rotary Movement.
Year: 1899

page_text: Date of Application, 9th Jan., 1899
Complete Specification Left, 9th Oct., 1899-Accepted, 2nd Dec.,
1899
Improvements in Gearing for Transforming a Continuous Rotary
Movement into an Intermittent Rotary Movement.
I, ROBERT WILLIAM PAUL, of 44, Hatton Garden, E.C., in the County of London,
Electrician and Manufacturer of Scientific Instruments, do hereby declare the
nature of this invention to be as follows:-
My invention consists of an improved method of driving intermittently a
shaft or wheel from another approximately parallel, and of preventing any shock
or jar on the starting or stopping of the driven wheel, which may be locked in
position after each successive movement.
In constructing gearing according to my invention I describe a pitch circle
of convenient diameter with the driving axis as centre, and a pitch circle of one
half that diameter about the axis to be driven, intersecting the former circle at
two points such that two radii of the smaller circle being drawn to these points
include an angle of 120 degrees and form tangents to the larger circles.
If at one of the points of intersection a pin is attached to the larger or driving
circle, on rotating the circle the pin will enter a slot, or impinge on a rib
formed on one of the above mentioned radii of the driven circle and impart
to the latter a velocity gradually increasing from zero to a maximum as the pin
approaches the line joining the centres of the two circles, and gradually decreasing
to zero as it is about to leave the slot or rib, when the radius of the driven circle,
equidistant between the above mentioned two radii, is left in position to be
similarly acted upon. The driven wheel may be locked in this position by
forming on its edge concavities which fit the convex edge of the driving wheel,
or by suitable ratchet and pawl, or other known means, or the driven wheel may
have gearing connected to it which may be locked in any suitable manner to
cause the driven wheel to remain in position for its next movement.
rollers
I prefer to construct the driving wheel in the form of a dise, which may be of
suitable weight to act as a fly wheel, and accumulate energy in that part of its
revolution when it is not acting on the driven wheel, and to make it smaller in
diameter than the pitch, circle on which the driving pins or
are planted, they being attached to projecting arms or flanges of the wheel.
and to avoid friction and wear of these pins I prefer to make them free to
revolve on their axes when impinging on the radial arms slots or ribs of the
driven wheel. The difference in diameter of the wheel and its pitch circle enables
slots to be cut in it as well as the concavities on its edge, without weakening it
too much. When the driven wheel is provided with these concavities for locking
it I may cut away the edge of the driving wheel opposite to each pin or roller,
to enable the driven wheel to turn freely without jamming against it. According
to the number of movements of the driven wheel desired for each revolution of the
driving wheel I may place from one to six of the pins or rollers on the latter,
and I may combine on one shaft two or more driven wheels to be moved alternately

page_text: by the same or different driving wheels, and one driving wheel may drive a
number of driven wheels arranged round it.
Improvements in Gearing for Transforming a Continuous Rotary
Movement into an Intermittent Rotary Movement.
I, ROBERT WILLIAM PAUL, of 44, Hatton Garden, E.C., in the County of London,
Electrician and Manufacturer of Scientific Instruments, 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 invention consists of an improved method of driving intermittently a shaft
or wheel from another approximately parallel, and of preventing shock or jar
on the stopping or starting of the driven wheel.
In constructing gearing according to my invention I attach to the driving shaft
an arm carrying a pin or roller, or a disc carrying such, or form a projection
of any suitable kind to act upon the driven wheel as described below, and I cause
this to act on the driven wheel in such manner that the pin or roller slides or
rolls on radial ribs or grooves which when in the resting position form tangents
to the pitch circle described by the driving pin.
In order that the method of carrying out the invention may be better described
and ascertained reference is made to the accompanying drawings. Fig. 1 shows a
gear which drives the shaft B intermittently four times for each revolution of
the shaft A. The latter carries a disc Con which are 4 pins whose centres are
on the pitch circle a, and the shaft B carries the wheel D, whose radius is one half
that of a, the distance A B being such that the radii, Be Be are tangents to a. On
the face of D are three ribs whose acting sides are parallel to these radii but set
back from them a distance equal to the radius of pins E F G H. The pin H is
shown impinging at on the rib which being tangential to its motion is carried
forward without shock until it reaches the position of Be when the pin leaves the
rib in the same tangential position. If the motion is rapid it is advisable to have
a means of locking the wheel D in the resting position ready for its next move-
ment, and several ways of doing this are shown.
In Fig. 1 three concave faces are formed on the rim of D, which fit to convex
edge of C, such convex edge being within the pitch circle a, and cut away where
the horns e de enter during their movement.
Fig. 2 shows this gear in elevation.
Fig. 3 shows in plan and Fig. 4 in elevation, another form of the gear. The
shaft A carries a forked arm C with roller E which acts on the slots Be Bd Be cut
in wheel D which is shown in the middle of its movement.
An alternative mode of locking the driven wheel is shown, the wheel K being
mounted on an axis at right angles to A & B and geared with them and having
a notch L cut in it, so as to allow the movement of D at the required time but
to enter notches M N O after the motion has taken place.
Figs. 5 & 6 show another method of keeping the wheel D in position after the
intermittent movement, consisting of the spring K, carrying a roller L which
drops partly into the radial slots & steadies the wheel D sufficiently when the
inertia is not too great.
I do not limit myself to any particular method of keeping the driven wheel
in position during the periods between its movements and it is evident that the

page_text: form of slot wheel shown in Figure 3 may be formed with concavities as in
Figure 1 or the spring roller L as shown in Figure 5 may be modified into a
pawl or catch which can be released by cams or gearing at the required moment.
I may also arrange several driven wheels to be actuated by the same driver
and such wheels may be interlocked with each other by suitably arranging the
locking catches. Moreover the gearing being symmetrical about the line joining
the two axes an oscillatory motion of the driving wheel may be transformed into
an intermittent to and fro motion of the driven wheel.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:―
1. In gearing for transforming a rotary movement into an intermittent rotary
movement, the combination of a driving pin roller or projection describing a
circular path with ribs, slots or other radial or approximately radial acting sur-
faces upon the driven wheel so arranged that in the resting position such radii
form tangents to the circle described by the driving point.
2. The combination of the intermittent gearing as described with locking
devices substantially as described with reference to Figures 1 to 6 of the accom-
panying drawing.