Circular saw

A cutting apparatus, comprising:

• a machine base;
• a sliding unit comprising a slide shaft and a stationary mount, said slide shaft being axially inserted through said machine base, said stationary mount comprising a mounting portion fixedly mounted at one end of said slide shaft for enabling said stationary mount to be driven by said slide shaft to move relative to said machine base, said mounting portion of said stationary mount comprising a front side remote from said sliding shaft, said front side defining a datum plane extending substantially perpendicular to an extending direction of said slide shaft;
• a cutting unit comprising a supporting arm and a circular saw blade, said supporting arm being pivotally connected to said stationary mount, said saw blade being pivotally connected to said supporting arm and movable by said supporting arm up and down relative to said datum plane between an upper limit position and a lower limit position, wherein said saw blade intersects with or tangentially touches said datum plane when said saw blade reaches said lower limit position;
• and
• a guard mechanism comprising a saw blade guard, a support and a link, said saw blade guard being pivotally connected to said supporting arm to surround said saw blade, and said support being mounted at a top side of said stationary mount and defining a guide groove and a bearing groove.

A circular saw, comprising:

• a machine base;
• a sliding unit comprising a slide shaft and a stationary mount, said slide shaft being axially inserted through said machine base, said stationary mount comprising a mounting portion fixedly mounted at one end of said slide shaft for enabling said stationary mount to be driven by said slide shaft to move relative to said machine base, said mounting portion of said stationary mount comprising a front side remote from said sliding shaft, said front side defining a datum plane;
• a cutting unit comprising a supporting arm and a saw blade, said supporting arm being pivotally connected to said stationary mount, said saw blade being pivotally connected to said supporting arm and movable by said supporting arm up and down relative to said datum plane between an upper limit position and a lower limit position;
• a guard mechanism comprising a saw blade guard, a support and a link, said saw blade guard being pivotally connected to said supporting arm to surround said saw blade, said support being mounted at a top side of said stationary mount and defining a guide groove and a bearing groove, said link having a first end thereof pivotally connected to said saw blade guard and an opposite second end thereof providing a protruded guide portion and a protruded bearing portion;
• and
• wherein said bearing groove defines a first sloping segment and a second sloping segment, said first sloping segment sloping downwardly away from said datum plane, and said second sloping segment extending obliquely downwardly from a bottom end of said first sloping segment in a direction toward said datum plane.