A control mechanism in combination with an electric motor assembly in which an output shaft having a cam surface is connected to the electric motor through a gear train located in a housing. A switch block assembly is on the housing. First and second arms extend from the switch block assembly with the first arm having a contact near the free end thereof and the second arm intersecting the first arm. The second arm rides on the cam surface of the output shaft and has a contact which moves in and out of engagement with the contact of the first arm. The first and second arms are disengaged when the output shaft begins a cycle of rotation and are engaged when it completes the cycle. The switch block assembly includes a base formed integrally with the gear train housing. The base has posts and a central block located between the posts. A switch top includes a pair of blocks, a cross member connecting the blocks and a passage formed in each block.