IMPROVEMENTS IN OBTAINING INTER- MITTENT ROTARY MOTION
Year: 1884

page_text: I GEORGE MASON 67 Bradshawgate, Bolton, Lancashire, Engineer, do hereby
declare the nature of said invention for IMPROVEMENTS IN OBTAINING INTER-
MITTENT ROTARY MOTION and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
My invention will be fully understood on reference to the sheet of drawings.
The object of said invention is to obtain an intermittent rotary motion from a
continuous rotary motion. The intermittent rotary motion may be periodical, or
be regulated at will, or may occur when there is accidental obstruction in the parts
driven intermittently.
On the sheet of drawings Fig. 1, is an elevation Fig. 2, a side view, and Fig. 3,
a plan partly in section of the general arrangement for accomplishing the object
intended.
A is a shaft to be driven intermittently with the sheathed pulley a secured to it
which is connected by a wrapping connector, such as a belt to some continuously
rotating pulley; B is a brake pulley also secured to the shaft A and of a larger
diameter than the sheathed pulley a; C is a brake framed with the lever c working
on a stud c', said lever has a band of leather or other suitable material cl, the said
lever is so shaped that the band being fixed at each end to the lever as shewn the
pressure s applied to the brake pulley by a part of the band between the fixed ends
where there is no support to the band on the opposite side, thus giving a soft even
pressure on the brake pulley.
To regulate the time of action of the brake, a shaft D rotating at the speed
required, has a cam d shaped to suit the time required secured to it the cam d acts
on the brake lever by the lug c¹; Fig. 1 shows the cam & holding the brake clear
of the pulley. It is plain that when the cam is turned round away from cl, the
brake acts on the pulley and causes a resistance to motion of the shaft A, and the
resistance to motion of the shaft A, by reason of the brake pulley B being larger
than the pulley a and the pressure being adjustable by weight o¹¹¹, or spring,
causes the motion of the shaft A to cease.
So, by the rotation and shape of the cam, the resistance can be applied to
the brake and taken off as desired, and the required intermittent rotary motion

page_text: obtained there being no motion transmitted when the brake is on, but the motion
is transmitted when the brake is off.
A suitable fraine E is adapted to carry the aforesaid parts with bearings to carry
the shafts. The pulley a works against the bearing a¹ and the boss of the brake
pulley against b and so prevents endways motion.
The intermittent motion can be controlled at will by working the cam by hand
or by any arrangement of levers.
Said invention is not limited to the arrangement shewn but may be considerably
modified as required.
Fig. 4 is a modification of the brake where the lever is bent to suit the purpose
required; the brake may be arranged so as to have the pressure put on by hand
and be held off by a weight or spring.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is:
1-The general combination as shewn and described in Figs 1, 2 and 3 to obtain
an intermittent rotary motion.
2-The brake formed by a flexible band fixed at both ends to a shaped lever as
and for the purposes shewn and described.