Oscillating device of belt sander

An oscillating device of a belt sander, the belt sander comprising a base, the base being provided with a workbench, a substrate and a rotating unit, the rotating unit including a motor for driving a roller to rotate, the oscillating device comprising:

• an oscillating unit, including a rotating member and an oscillating member, the rotating member including a frame, the frame being pivotally connected to the substrate, a rolling wheel being pivotally connected to the frame, an abrasive belt being sleeved on the rolling wheel and the roller, the oscillating member being disposed at a bottom of the substrate and connected to the rotating member, the oscillating member including an electric motor, the electric motor being connected with a linking member through a linking shaft, the linking shaft and the linking member being arranged eccentrically, the linking member being connected to the frame,
• wherein the oscillating unit further includes a positioning member, the positioning member has a cover plate, one side of the cover plate is provided with a limiting block and a retaining rod, the cover plate, the limiting block and the retaining rod are respectively fixed to the substrate, the cover plate has a through hole, a perforation is formed between the limiting block and the substrate, one side of the limiting block, close to the retaining rod, is formed with a limiting groove, a shaft is inserted in the through hole and the perforation, and one end of the shaft, close to the limiting block, extends outwardly and is pivotally connected to a pivot plate through a pivot member;
• wherein the pivot plate has a driving portion and a driven portion that are perpendicular to each other, the driving portion of the pivot plate is close to the retaining rod to be blocked by the retaining rod, a free end of the driving portion of the pivot plate is connected to a handle, a free end of the driven portion of the pivot plate is pivotally connected to a pivot wheel, the pivot wheel is movably disposed in the limiting groove, another end of the shaft, opposite to the handle, extends out of the substrate and is pivotally connected to the rotating member, and the shaft is sleeved with an elastic member between the cover plate and the rotating member.