Device for reeling and unreeling a power supply line

A device for unidirectionally reeling and unreeling a power supply line, including:

• an upper bearing and a lower bearing;
• an upper cover formed with an upper bearing installation boring for installing the upper bearing and an outlet for reeling or unreeling the power supply line;
• a lower cover formed with a lower bearing installation boring for installing the lower bearing and a reeling-unreeling control assembly installation boring;
• a rotary disc formed with a coil spring receiving space on one side thereof and
• a cylinder-like reeling post at a center portion of the other side thereof and supported by the upper bearing and the lower bearing rotatably, a plurality of reeling-unreeling control grooves being uniformly arranged on an outer wall of the coil spring receiving space, and the power supply line being reeled on the reeling post;
• a plug connected to one end of the power supply line;
• a coil spring installed in the coil spring receiving space;
• a clip body being installed on the rotary disc and used for clipping the power supply line;
• a conductive unit located in the clip body;
• and
• a reeling-unreeling control assembly installed in the reeling-unreeling control assembly installation boring of the lower cover and used for controlling a reeling-unreeling length of the power supply line.