Sawing device allowing saw blade to be retracted

A sawing device comprising:

• a base;
• a worktable disposed on the base for support a workpiece;
• a sawing unit including a saw arm having a bottom end thereof pivotally connected with the worktable through a first shaft, a saw blade box disposed adjacent to a bottom side of the saw arm and pivotally connected with the saw arm through a second shaft, a motor mounted to one side of the saw blade box, and a saw blade connected to the motor and partially covered by the saw blade box, such that the saw blade is driven by the motor to rotate and the saw blade is driven by the saw arm to be pivotable between an initial position and a sawing position with respect to the worktable;
• and
• a braking block disposed adjacent to a top of the saw blade and located in a braking notch of the saw blade box and having one end thereof pivotally connected with the second shaft, wherein when the saw blade touches an object that is not the workpiece, the braking block presses against the saw blade to stop rotation of the saw blade, and a kinetic energy generated by the instantaneous stop of the saw blade drives the saw blade box together with the saw blade to pivot around the second shaft in the direction away from the worktable to a retracted position, thereby letting the saw blade leave the object,
• wherein a top side of the saw arm has a hollow portion;
• when the saw blade is moved away from the worktable to the retracted position, a part of the saw blade box protrudes out of the top side of the saw arm through the hollow portion.