Patent ID: 8159460

Claim:
A four axles center wheel module for a mouse comprising a coder assembly for outputting a encoded pulse electronic signal, a center wheel, a mouse circuit board, wherein the coder assembly is suited around a center shaft of the center wheel, a swing component is installed in a slot on a mouse motherboard or the mouse circuit board, a front end supporting shaft of the swing component is installed on a front support of the mouse motherboard or the circuit board, a card groove is set at both sides of the swing component to support the center wheel, touch arms for cooperating with switches on the mouse circuit board are set at two sides of the swing component, a wheel downward press key touch arm is set at a trailing end of the swing component, a wheel downward press key switch is set on the mouse circuit board below the wheel press downwards key touch arm; a position limiting device is set respectively on the swing component and the mouse circuit board so that kinetic left or right misoperation signals generated by left or right swinging of the swing component under press operation are prevented.