Model 36: step-dwell mechanism
consists of a superposition of a crank-slider mechanism and a planetary gear
pair. The coupler AB and the planet wheel (radius r=AB) are part of the same
body. The rotation centre of the sun wheel coincides with the crank rotation
dimensions this mechanism will make a continuous stepping motion of the sun
gear. The usual application is to drive a belt with intermittent motion, as
sometimes required in production machinery. The (infinitesimal) dwell is
short, but the motion is very smooth, see the graph below.
output step b
of the sun gear can be a whole division n>1 of one revolution of the input
crank angle a.
In the model n=6, so the output step is 60 deg.
For a given
value of the sun gear radius R0 the other dimensions are
determined as follows:
Planet gear radius r = R0*(n - 1) / n
a = R0 - r