Window assembly with a motorized window shade mechanism

A motorized window shade assembly for operating a window shade having a rail attached to one end of the shade to extend and compress the shade with movement of the rail, comprising:

• a shell having two sidewalls;
• a rail extending between said two sidewalls of the shell;
• said sidewalls having respective opposed inner surfaces with a channel therein, shoulders adjacent and perpendicular to said inner surfaces, respectively, and a traction surface on each of said shoulders;
• an axle rotatingly coupled to said rail and having a traction wheel coupled to each end thereof, opposite tips of said axle riding within the channels in said sidewalls, and said traction wheels engaging said traction surface;
• and
• a motor attached to said rail and drivingly coupled to said axle.

A motor control circuit for a motorized mechanism having two motors each of which operates one of two shade portions of a window shade, comprising:

• sensing means to detect arrival of said shade portions at an UP position or a DOWN position;
• manually operable switch means to designate operation of the window shade in either a DOWN direction or an UP direction in which the window shade is extended or compressed, respectively;
• switch means for automatically directing power to one of the two motors;
• and
• control means for directing power to one of the motors in response to said manually operable switch means until the shade portion movable thereby reaches one of said UP and DOWN positions and, in response thereto, automatically switching the power to the other motor.