Actuator drive and display mechanism

摘要

A shaft coupling drive couples a first shaft and a second shaft. The shaft coupling drive includes the first shaft having a rotational axis and a free end, and the second shaft having a rotational axis and a free end. The second shaft is aligned coaxially with the first shaft. A cam plate is mounted on the free end of the second shaft wherein the cam plate includes a face and a shoulder protruding from the face. A cam is mounted on the free end of the first shaft wherein the cam includes a face and a shoulder protruding out of the face. A first spring biases the free end of the second shaft toward the free end of the first shaft to urge the faces of the cam late and cam together wherein the shoulder of the cam plate aligns with the shoulder of the cam in only one relative rotational position. A second spring biases the shoulders together.