Automatic paper feeding mechanism adapted to a paper roll and thermal sublimation printer therewith

A thermal sublimation printer, comprising:

• a paper roll;
• a feeding roller for moving a printing medium on the paper roll;
• and
• an automatic paper feeding mechanism for conveying the printing medium on the paper roll to the feeding roller, the automatic paper feeding mechanism comprising:
• a first pivotal member;
• a paper pressing module pivoted to the first pivotal member for pressing the paper roll;
• a driving member for driving the paper pressing module, such that the paper pressing module respectively presses the paper roll in a first position and a second position;
• and
• a paper guiding module connected to the paper pressing module, the paper guiding module comprising:
• a second pivotal member;
• a first paper guiding member;
• and
• a second paper guiding member pivoted to the second pivotal member and connected to the paper pressing module and the first paper guiding member, the second paper guiding member being driven by the paper pressing module for moving the first paper guiding member from a first guiding position to a second guiding position when the paper pressing module is moved from the first position to the second position, so as to adjust the gap between the first paper guiding member and the paper roll.