Patent ID: 8537187

Claim:
A thermal transfer printing device, comprising: a thermal transfer printing module for printing a thermal transfer paper; and a paper ejecting module arranged downstream of said thermal transfer printing module for outputting said thermal transfer paper, and said paper ejecting module comprising: a D-shaped ejecting roller for transporting said thermal transfer paper; a driving gear connected with said D-shaped ejecting roller, wherein said driving gear is not synchronously rotated with said D-shaped ejecting roller, and said driving gear is driven to be rotated in a first rotating direction or a second rotating direction; a switching roller connected with said D-shaped ejecting roller and synchronously rotated with said D-shaped ejecting roller for controlling whether said D-shaped ejecting roller is contacted with said thermal transfer paper or not; a spring connected with said driving gear and said switching roller, wherein in response to rotation of said driving gear, said spring provides a friction force to said switching roller, so that said switching roller is synchronously rotated with said driving gear; and a stopper disposed beside said switching roller, wherein during said thermal transfer paper is printed by said thermal transfer printing module and said driving gear is rotated in said first rotating direction, said switching roller is stopped by said stopper from being rotated in said first rotating direction, so that said D-shaped ejecting roller is not contacted with said thermal transfer paper, wherein after said thermal transfer paper has been printed and said driving gear is driven in said second rotating direction, in response to said friction force, said switching roller and said D-shaped ejecting roller are rotated in said second rotating direction, so that said D-shaped ejecting roller is contacted with said thermal transfer paper to output said thermal transfer paper.