| 摘要 |
In an electrically operated window screening arrangement, where the movement in one direction between two end positions corresponding to a screened and an unscreened, respectively, window is effected by winding draw cords or strings (3, 4) on at least one winding drum (5, 6) in a horizontal main frame or sash member (7), the winding drum is over a motor shaft (8) connected with an electric drive motor (9). The movement in the opposite direction is carried out by means of a constant force during simultaneous unwinding of said draw cord or string (3, 4). An end stop device comprises a contact (11) for disruption of the motor current during movement in said opposite direction by activation from a sensor (17). The motor shaft (8) is journalled in such a way that it may perform a limited tilting movement with axis of rotation in or at its connection with the drive motor (9), and the sensor comprises a contact member (17) belonging to said contact (11) and in abutment against a shaft part (8) positioned farthest away from the motor (9), the shaft (8) being spring-biassed in the opposite direction of the load produced by the draw cords or strings (3, 4).
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