| 主权项 |
1. A single pull rope driving device for a window curtain comprising:
a bracket (1); a rotation driving device (3) mounted to the bracket (1) and including a pull rope (12); a reeling drum (2) rotatably mounted to the bracket (1) or the rotation driving device (3), with the reeling drum (2) adapted to release/wind a curtain cloth (26) by pulling the pull rope (12); a gear (7) rotatably mounted to the bracket (1) or the rotation driving device (3), with the gear (7) jointly rotatable with the reeling drum (2), with the gear (7) including a plurality of teeth (7a); an actuating member (13) mounted on the pull rope (12) and located below the gear (7) in a vertical direction; a rack (9) movable in the vertical direction and including upper and lower ends (91) and (92) spaced from each other in the vertical direction, with the upper end (91) of the rack (9) including at least one tooth (10a) releasably engaged with the plurality of teeth (7a) of the gear (7), with the lower end (92) of the rack (9) located below the gear (7) in the vertical direction and actuatable by the actuating member (13); and a return spring (11) coupled to the rack (9), with the return spring (11) biasing the rack (9) to a disengagement position in which the at least one tooth (10a) of the rack (9) is disengaged from the plurality of teeth (7a) of the gear (7), with the gear (7) and the reeling drum (2) rotatable in a releasing or winding direction by pulling the pull rope (12) downward without actuating the rack (9), wherein if the actuating member (13) is actuated by pulling the pull rope (12) to move the rack (9) downward in the vertical direction, the at least one tooth (10a) of the rack (9) is moved to engage with the plurality of teeth (7a) of the gear (7) and drives the gear (7) and the reeling drum (2) to rotate in the releasing direction. |
