Patent ID: 7572170

Claim:
A low load swinging mechanism for a sander, said sander comprising: a main base provided with a conveyer installed above the main base and a driving unit positioned at one side of the main base; and a roller unit extended axially from said driving unit and being positioned above said conveyer with a preset space wherein the roller unit being provided with a positioning base; a sliding base moves, driven by said driving unit, on said positioning base; an emery cloth roller positioned on said sliding base and pivot driven by said driving unit; said positioning base being provided with a sliding rail and installed at two sides of the positioning base respectively to contact with an engaging member provided in said sliding base; and each of said sliding rail formed with an arc surface for contacting with a corner groove that is concaved in said engaging member with a preset angle, and to keep said arc surface of said sliding rail only contacting linearly with said corner groove of said engaging member for reducing a contacting area between said positioning base and said sliding base.