Shearing machine

A shearing machine for shearing a plate workpiece comprising:

• a frame;
• a ram having an upper cutting blade and being mounted on the frame in a vertically movable manner;
• a worktable being fixedly mounted on the frame and having a lower cutting blade to define an opening between the upper cutting blade and the lower cutting blade so that a plate workpiece is placed so as to be sheared on the worktable;
• an upper connecting plate being mounted on the frame adjacent to, and in parallel with, the ram;
• a plate restraint means having a plurality of elastic bodies, which restraint means are supported by the upper connecting plate in a vertically movable manner and are urged resiliently to the lower direction for securing the workpiece on the worktable, said plate restraint means being in engageable contact with the ram so as to be raised by the upward movement of the ram, said plate restraint means including a plurality of elevating rods each having a flange member mounted on the respective upper ends thereof, said flange member cooperating with a fork member mounted on the upper section of the rain;
• and
• a pressure adjusting means being mounted on the upper connecting plate and having a seat plate engageable with the elastic bodies to push the upper ends thereof by a hydraulic piston-and-cylinder, so that the resilient forces of the elastic bodies are adjustable.