Hinge device for use in office machine

An office machine comprising:

• a main body;
• a rotatable upper cover placed on said main body;
• and
• a hinge device arranged between said main body and said upper cover, and comprising:
• a base including a connecting part and a shaft sleeve part, wherein said connecting part is connected with and fixed on said main body, said shaft sleeve part has a channel and a baffle, and said baffle is a protruding plate extended from an external surface of said shaft sleeve part;
• a rotating shaft penetrated through said channel of said shaft sleeve part and fixed on said upper cover;
• and
• an elastic structure including a fixing part fixed on said upper cover and a bending part contacted with said shaft sleeve part,
• wherein said bending part is correspondingly moved on said external surface of the shaft sleeve part during a process of opening or closing said upper cover, said baffle is served as a positioning point, and when said upper cover is changed from a close status to an open status, said bending part is moved from a lower portion of said baffle to be across said baffle and sustained against an upper portion of said baffle, so that said bending part is supported by said baffle and said upper cover is supported by said elastic structure to position said upper cover in said open status and define an included angle between said upper cover and said main body, and said rotating shaft is in contact with an inner wall of said channel and interference-fitted into said channel in said open status.