Patent ID: 7475623

Claim:
A pressing structure for a hole-punching unit mainly comprising an axle, two wrenching pieces, a pole and two pressing pieces, wherein said axle is axially attached to a case of said hole-punching unit, with one end of said axle axially connecting to a control knob, each wrenching piece connecting to said axle near an end thereof so as to let said control knob to drive each wrenching piece to move synchronously, said wrenching piece having a retaining edge disposed at each side thereof; said pole being disposed near said hole-punching assembly, said pressing piece being pivotally disposed on said pole, said pressing piece having a spring coil disposed at a middle thereof and pivotally connected to said pole, and said pressing piece having a pair of lapping portions extending from a first side of said spring coil, and a pair of suppressing portions extending from a second side of said spring coil, said lapping portions leaning against an upper edge of said wrenching piece, said suppressing portions extending towards said hole-punching assembly so as to let said suppressing portions to press said hole-punching assembly and to fasten said hole-punching assembly.