Model 36: step-dwell
mechanism

Kinematic scheme:

Explanation:

The 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 centre A For certain 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. |

Dimensions:

The 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 R Planet gear radius r = R Crank length a = R |

Literature:

Remarks: