Safety working arm device for punching machine

The utility model provides a safety working arm device for a punching machine. The utility model adopts the linked lever principle. The utility model is operated by a linked pressure controlling lever, and is actuated through a mechanism which is composed of a grab handle, a guide holder group, a linked pressure controlling lever and a screw spring; three magnetic elements are simultaneously controlled to hold and separate the working piece. The three point distribution of the three magnetic elements is used to make the safety working arm for a punching machine provide large and easily-balanced holding surfaces for the work piece. Thus, the stableness of the holding of the work piece by the safety working arm for the punching machine is achieved, the work safety is enhanced, and the use is convenient.