Stapler

A stapler comprising:

• a body including two holes formed on two sidewalls thereof and a link defined on one sidewall thereof;
• a magazine assembly installed in the bottom of the body;
• a handle assembly including a handle lever formed on an end thereof, a handle stop defined on another end thereof, a link and a through hole between the handle lever and the handle stop, a connector disposed in the link thereof and respectively pivotally coupling to the holes, and a first roller inserting through the through hole and moving rotatably in the link of the body;
• a power spring disposed in the body;
• and
• a plunger including a first hole and a second hole;
• wherein the handle stop of the handle assembly inserts to the first hole, and an end of the power spring inserts to the second hole;
• wherein while the handle lever is pressed downwardly and the handle stop lifts the plunger upwardly, the first roller is driven to move rotatably in the link of the body as to detach the handle stop from the first hole of the plunger gradually.