Automatic descending structure of roller shade fabric and manually operated roller shade

A manually operated roller shade, comprising an automatic descending structure for roller shade fabric, suitable for being arranged on a manually operated roller shade, comprising:

• a roller shade fabric controller for controlling lifting and lowering of the roller shade fabric, wherein the roller shade fabric controller comprises a roller shade drum (3), a first housing (1), and a second housing (2) arranged opposite to the first housing (1), the roller shade drum (3) is rotatably arranged between the first housing (1) and the second housing (2), the roller shade drum (3) is connected to the roller shade fabric, and the roller shade fabric is driven to be lifted and lowered by rotation of the roller shade drum (3), and the first housing (1) is provided with a first limiting mechanism for limiting an ascending position of the roller shade fabric, so that the roller shade fabric has an ascending limit position;
• and
• the first limiting mechanism comprises a first screw (4) and a first rotating sleeve (5) threadedly sleeved on the first screw (4), the first screw (4) is fixedly connected to the first housing (1), the first rotating sleeve (5) is connected to the roller shade drum (3) and rotates synchronously with the roller shade drum (3), and a first limiting piece (41) for limiting the first rotating sleeve (5) is provided on one end of the first screw (4);
• wherein the manually operated roller shade comprises:
• a pull rod (22), a pull cord (24) for driving the roller shade drum (3) to rotate circumferentially is arranged on the first housing (1), one end of the pull cord (24) is an external force pulling end (241), the pull rod (22) comprises an outer rod (25) and an inner rod (26) slidably sleeved inside the outer rod (25), the external force pulling end (241) is connected to the outer rod (25), a connecting sleeve (27) is arranged inside the inner rod (26), a first wire hole (2701) corresponding to the pull cord (24) is formed on an inner side of the connecting sleeve (27), a cord body (28) is connected between the connecting sleeve (27) and the first housing (1), an elastic member (29) is arranged between the inner rod (26) and the connecting sleeve (27), and an upper end of the inner rod (26) is pressed against the first housing (1) by an elastic force of the elastic member (29).