Punch linkage pre-pressing device

The utility model relates to a punching machine linkage pre-pressing device which comprises a base, a main gear is installed in the base, a plurality of pre-pressing devices are evenly arranged on the base around the main gear, each pre-pressing device comprises a driven gear, a sleeve and a pressing column, the sleeve is installed on the base in an embedded mode, the pressing column is installed in the sleeve, and the driven gear is installed on the base. A spiral through hole is formed in the side wall of the sleeve, a guide column inserted into the spiral through hole is installed on the side wall of the pressing column, a pressing plate is arranged at the upper end of the pressing column, a driven gear meshed with the main gear is rotatably installed in the base and located below the sleeve, and a threaded hole is concentrically formed in the middle of the driven gear. The lower end of the pressing column is in threaded connection with the threaded hole. The four pre-pressing devices are controlled at the