A screening device for a window and related method

摘要

A screening device (100,101,102,103,104) for screening a window (1). The screening device includes a screen (5) with a variable length (L), a fixed width (W) between two edges of the screen (5) and with a positionable free end (4). The longitudinal position of the free end (4) determines the length (L) of the screen (5). An electric drive is operably connected to the screen (5) for adjusting the longitudinal position of the free end (4). An elongated guide member parallel with the two edges is arranged adjacent to one of the two edges. A position indicator (6) is provided for manually indicting a desired longitudinal position of the free end. The longitudinal position of the position indicator (6) is freely manually adjustable by an operator to any longitudinal position along the elongated guide element. The screening device has a sensor arrangement configured for detecting a difference between the actual longitudinal position of the free end (4) and the actual longitudinal position of the position indicator (6). The screening device also includes a circuit or processor connected to the sensor arrangement. The circuit or processor is configured to operate the electric drive with the aim to reduce the detected difference between the actual longitudinal position of the free end (4) and the actual longitudinal position of the position indicator (6). It is suggested that Fig. 3 is published with the abstract.