Abstract: A motorized reel system for window covering has a reel-system case (1) with a length for being extended between opposite sides of a window frame (2). The reel-system case encloses a reel motor (3) in a first end and a shaft housing (7) in a second end. The reel motor is attached to a motor mount (4) having a reel slide (6) in which a first end of a reel (8) that is shaft-like slides linearly in one direction while the reel is also winding lift line (11, 12). The reel slides linearly in an opposite direction while unwinding the lift line. Linear sliding of the reel while also winding and unwinding the lift line is caused by rotation of external threads (9) in matching-thread contact with internal threads (10) in a threaded housing. Linear travel of the reel while it is being rotated spreads windings of the lift line evenly along the reel.

Abstract: A motorized reel system for window covering has a reel-system case (1) with a length for being extended between opposite sides of a window frame (2). The reel-system case encloses a reel motor (3) in a first end and a shaft housing (7) in a second end. The reel motor is attached to a motor mount (4) having a reel slide (6) in which a first end of a reel (8) that is shaft-like slides linearly in one direction while the reel is also winding lift line (11, 12). The reel slides linearly in an opposite direction while unwinding the lift line. Linear sliding of the reel while also winding and unwinding the lift line is caused by rotation of external threads (9) in matching-thread contact with internal threads (10) in a threaded housing. Linear travel of the reel while it is being rotated spreads windings of the lift line evenly along the reel.