A roller blind with a tensioning device, wherein the roller blind comprises a power source, a roller, a curtain material, a length-limiting locating element, and a tensioning device;
- the length-limiting locating element is configured to limit an unwinding length of the curtain material and comprises a positioning roller;
- the tensioning device comprises a driving medium and a driving wheel assembly;
- the driving wheel assembly comprises a driving wheel, a pawl and a pawl support shaft;
- the driving medium is ring-shaped and wraps around the driving wheel and the positioning roller;
- the power source is drive-connected to the roller, and the roller is connected to the driving medium via the driving wheel assembly, ensuring the driving medium to rotate with the roller;
- the roller is further connected to the driving medium via the curtain material;
- the tensioning device further comprises a synchronizing device assembly;
- the synchronizing device assembly comprises a housing, a friction assembly, and a shaft;
- the synchronizing device assembly is drive-connected to the roller;
- the friction assembly comprises a first friction ring and a second friction ring;
- the shaft passes through the first friction ring and the second friction ring;
- an inner ring contour of the second friction ring is provided with a second interlocking component that matches an outer contour of the shaft, ensuring the second friction ring to rotate synchronously with the shaft;
- the first friction ring is in close contact with the second friction ring, and a friction force between the first friction ring and the second friction ring drives the first friction ring and the second friction ring to rotate in the same direction;
- an outer ring contour of the first friction ring is provided with a first interlocking component matching the inner wall of the housing, ensuring the housing to rotate synchronously with the first friction ring;
- the synchronizing device assembly is drive-connected to the driving medium via the driving wheel assembly;
- the driving wheel is a ratchet gear;
- ratchets of the ratchet gear are inclined towards the same rotation direction and arranged around an inner circumferential surface of the ratchet gear;
- a front end of the pawl is positioned within the ratchets of the ratchet gear, and a root of the pawl is arranged on an outer circumferential surface of the pawl support shaft;
- the driving wheel assembly is configured such that:
- when a rotational direction of the pawl support shaft is the same as an inclination direction of the ratchets of the ratchet gear, the pawl engages within the ratchets of the ratchet gear, driving the ratchet gear and the pawl support shaft to rotate synchronously in the same direction;
- when the rotational direction of the pawl support shaft is opposite to the inclination direction of the ratchets of the ratchet gear, the pawl slips within the ratchets of the ratchet gear, and the ratchet gear does not rotate synchronously with the pawl support shaft;
- the driving wheel assembly only slips when rotating in a winding direction, and when rotating in an unwinding direction, the pawl and the ratchets of the ratchet gear are in a meshing state to push the ratchet gear to rotate;
- the pawl support shaft is drive-connected to the roller.