Four-corner rubberizing device for jointed board type box making machine

The four-corner rubberizing device comprises a shell made of polytetrafluoroethylene, a belt conveying channel penetrating through the left side and the right side of the shell is arranged at the upper end of the shell, a mounting cavity is formed below the side, opposite to a belt outlet of the belt conveying channel, in the shell, and the mounting cavity is communicated with the belt conveying channel. A belt outlet wheel in running fit is arranged in the mounting cavity, one side of the belt outlet wheel is located in the belt conveying channel, fixing blocks are arranged on the two sides of the upper end of the shell respectively, a belt pressing plate in running fit is arranged between the two fixing blocks, and the end of the belt pressing plate extends to the position above one side of a belt outlet of the belt conveying channel. And an adhesive tape feeding rolling gear in running fit is arranged at the end part of the tape pressing plate and is in transmission fit with the tape outlet wheel. Accordin