Abstract: A lateral support device includes a fixed seat mounted to a worktable, a lateral support plate having a sliding groove, and a pivot seat pivoted to the fixed seat and having a pressing portion arranged adjacent to the lateral support plate. A lock assembly has a pressing plate disposed to the pivot seat and arranged adjacent to the lateral support plate, a threaded rod threaded with the pressing plate through the pressing portion and the sliding groove, and a handle fixed to one end of the threaded rod. When the handle is locked, the lateral support plate is forced tightly and cannot be moved, and when the handle is unlocked, the lateral support plate is released and can be moved relative to the worktable for adjusting its position. Thus, the present invention provides lateral support to workpieces of different sizes for improving issues with incomplete cross-sections.

Abstract: A miter saw includes a worktable and a cutting unit. The cutting unit includes a movable arm pivotably connected with the worktable, a saw blade, a triggering switch and a tilt power-off module. The movable arm defines a reference plane which intersects a working surface of the worktable at an included angle. The tilt power-off module is disposed to detect the included angle and shift the triggering switch between a power-on state and a power-off state. The triggering switch is shifted to the power-off state when the tilt power-off module detects that the included angle is less than a predetermined breaking angle so as to prevent rotation of the saw blade in a folded position for safety purposes.