Patent ID: 7141750

Claim:
A printer apparatus, comprising: a front cover connected to a frame body and formed to be openable and closable; a sensing portion for sensing an opened state and a closed state of said front cover; a spring holding tab fixed to said frame body; and a turning spindle fixed to said frame body, wherein said front cover includes a protruding portion for driving said sensing portion, said sensing portion includes a base plate including a shaft insertion hole and a spring holding hole, a switch body fixed to a surface of said base plate and having a sensing button, a switch plate connected to said switch body and formed to extend to face said sensing button, a guide shaft placed to penetrate said shaft insertion hole in said base plate and restricting a movement of said base plate in a direction orthogonal to a turning direction of said base plate, and a coil spring hooked on said spring holding tab and in said spring holding hole, said switch body and said base plate are formed such that said turning spindle is inserted into said switch body to allow said switch body and said base plate to be turnable by allowing said turning spindle to serve as a fulcrum, said coil spring has elasticity in a direction along which said spring holding tab and said base plate approach, said printer apparatus is formed such that when said front cover is closed, said protruding portion presses said switch plate, and said switch plate in turn presses said sensing button, said printer apparatus is formed such that when said protruding portion is moved further inwardly than a closed position of said front cover, said switch body and said base plate turn to prevent said sensing portion from being damaged, and said printer apparatus is formed such that when said front cover is opened, said protruding portion moves away from said switch plate, and said switch plate in turn moves away from said sensing button.