Gear drive system with adjusting structure

A gear drive system, comprising:

• a securing panel, the securing panel comprising a panel body, a rack extending from the panel body, and a rotating shaft extending from the panel body;
• a drive gear, the drive gear engages the rack;
• a first slave gear, an upper part of the first slave gear is adjacent to the rack and aligned with the rack;
• a third slave gear, the third slave gear is located under the rack and engages the first slave gear;
• an adjusting structure, the adjusting structure comprising an elastic element mounted to the securing panel, a slave element pivotally mounted to the panel body, and a second slave gear;
• the second slave gear defines a rotating hole;
• the rotating shaft is received in the rotating hole;
• the second slave gear is movable relative to the panel body to enable the rotating shaft to be located in different positions of the rotating hole;
• the slave element comprising a pivot body pivotally mounted to the panel body, a pressing arm extending from the pivot body, and an engaging arm extending from the pivot body;
• the engaging arm engages the second slave gear;
• the second slave gear engages the third slave gear;
• when the drive gear rotates on the first slave gear, the second slave gear is configured to be driven by the third slave gear to rotate along a first rotation direction and move relative to the panel body to drive the engaging arm to move, thereby driving the pressing arm to press the elastic element.