Lottery ticket destroying device

A lottery ticket destroying device, comprising a housing, two roller cutters mounted in said housing, each said roller cutter having a shaft protruding from two opposite ends thereof, said shaft being rotatably inserted through said housing, and a transmission gear set mounted on one side of said housing, said transmission gear set comprising a first driven gear and a second driven gear respectively mounted on said shafts of said roller cutters at one end, wherein:

• said two roller cutters each comprise a roller cutter surface and a plurality of helical shear grooves recessed into said roller cutter surface, each said helical shear groove comprising a groove bottom surface, a vertical shear surface located on one side of said groove bottom surface and connected to said roller cutter surface and a chip-discharge surface located on an opposite side of said groove bottom surface and connected to said roller cutter surface;
• said shaft of one of said roller cutters comprises a mounting portion protruding from one side of said housing and sequentially mounted with a second driven gear of said transmission gear set, an elastic member and a retaining member, said elastic member having one end thereof abutted against said second driven gear and an opposite end thereof abutted against said retaining member, said retaining member being coupled to said mounting portion of said shaft.