US Patent 7587976 Printing apparatus having fixing mechanism including air pipe assembly

A fixing mechanism (2) includes a base (50), an air pump (70) and an air pipe assembly (60). The base defining a connecting hole (522) and a locating groove (542) therein. The air pipe assembly (60) includes a first pipe (62) communicating with the connecting hole, a second pipe (64) connected to the pump and communicating with the first pipe, and a third pipe (66) communicating with the first pipe and the second pipe.