Patent ID: 6976648

Claim:
A switch mechanism of double-duty shredder, comprising a mechnical drive device, a switch knob device, wherein said mechanical drive device further comprises a motor drive gear wheel having a first side provided with a small strap wheel that rotates synchronically with said motor drive gear wheel; a drive shaft that is an axial style having a multi-angular section; a shaft coat having a shaft hole with a multi-angular section corresponding to the multi-angular section of said drive shaft and having an outer profile with a step style configuration and provided with a first part, a second diameter part, and a third part; wherein the first part is larger in diameter than the second part, and the second part is larger in diameter than the third part; a large strap wheel disposed on said first part of said shaft coat and movable from left to right or from right to left, and rotatable in the same direction as the motor drive wheel, said small strap wheel is disposed on the side of motor drive gear wheel; a ratchet wheel covered around said second part and rotatable in the same direction with motor drive gear wheel by getting rotary power from motor drive gear wheel through idler wheel and provided with a through keyway on the circle; a drive key disposed in and glidable through said through keyway, a compressed spring disposed on a first side thereof; a pawl wheel having a shaft hole with a multi-angular section fixed to said multi-angular section of the drive shaft on the center and having a pawl corresponding to the position of said drive key; said switch knob device further comprising a fork including a flat plate preset a groove hole and a half-circular fork frame against on a first side of said large strap wheel; a generally inverted U-shaped switch knob arm having a long-groove hole on a center thereof and a left supporting arm passing through the long-groove hole of said fork flat plate, and a right supporting arm located on a switch knob plate corresponding to a fixed pivot; a fork frame disposed upon said fork and said switch knob arm having a horizontal plate and a vertical plate, wherein said horizontal plate pre-set a through hole and that vertical plate pre-set a latitude through groove served as the track of said fork plat plate moving in latitude direction; a knob having a circular knob portion and a switch pole, wherein said switch pole being accommodate in the long-hole groove of center of plate of said switch knob arm after passing through the through hole pre-set on horizontal plate of said fork frame.