Patent ID: 8266942

Claim:
A bending machine comprising: an upper bar; an operating platform; a lower die clamp received on the operating platform; an upper die holder movable towards and away from the operating platform, the upper die holder comprising: a main body comprising a top surface fixed to the upper bar, a lower surface opposite to the top surface and facing the operating platform, and two opposite side surfaces, the lower surface defining a sliding groove running through the two opposite side surfaces, the sliding groove comprising a bottom surface having a positioning hole defined therein, and one of the two opposite side surfaces defining a sliding slot communicating with the positioning hole; a positioning pin received in the positioning hole, the positioning pin defining a latching hole therein; a spring received in the positioning hole with one end thereof resisting the bottom surface of the positioning hole and the other end thereof resisting the positioning pin; and an operating rod received in the sliding slot with one end thereof received in the latching hole and the other end thereof extending out of the sliding slot; and an upper die clamp slidable in the sliding groove, a surface of the upper die clamp facing the bottom surface of the sliding groove defining a pinhole corresponding to the positioning pin.