Multi-link miter saw

1. A multi-link miter saw, comprising:

a base comprising a front edge and an opposing rear edge;

a table mounted at said base, said table comprising an axle holder disposed at said rear edge;

a supporting unit disposed at said rear edge and connected to said axle holder of said table;

a linkage unit connected to said supporting unit and swingeable between said rear edge and said front edge;

a cantilever arm unit pivotally connected to said linkage unit, said cantilever arm unit comprising a cantilever arm pivotally connected to said linkage unit and a connection member pivotally connected between said cantilever arm and said linkage unit, said cantilever arm being drivable by said linkage unit and said connection member to move along a horizontal axis between said rear edge and said front edge; and

a cutting unit comprising a saw blade holder pivotally connected to said cantilever arm unit, and a saw blade rotatably mounted in said saw blade holder,

wherein said linkage unit comprises a first link connected to said supporting unit, a second link pivotally connected to said first link, a third link pivotally connected to said first link opposite to said second link, and a fourth link pivotally connected between said second link and said third link; said cantilever arm of said cantilever arm unit is pivotally connected to said fourth link of said linkage unit; said connection member is pivotally connected between said cantilever arm and said third link, and

wherein said first link of said linkage unit comprises a first pivot-connection portion disposed adjacent to said axle holder, and a second pivot-connection portion disposed opposite to said first pivot-connection portion and pivotally connected to said second link; said third link comprises a lower pivot-connection portion pivotally connected to said first pivot-connection portion, an upper pivot-connection portion disposed opposite to said lower pivot-connection portion and pivotally connected to said fourth link, and a middle pivot-connection portion disposed between said lower pivot-connection portion and said upper pivot-connection portion and pivotally connected with said connection member.

2. A multi-link miter saw, comprising:

a base comprising a front edge and an opposing rear edge;

a table mounted at said base, said table comprising an axle holder disposed at said rear edge;

a supporting unit disposed at said rear edge and connected to said axle holder of said table;

a linkage unit connected to said supporting unit and swingeable between said rear edge and said front edge;

a cantilever arm unit pivotally connected to said linkage unit, said cantilever arm unit comprising a cantilever arm pivotally connected to said linkage unit and a connection member pivotally connected between said cantilever arm and said linkage unit, said cantilever arm being drivable by said linkage unit and said connection member to move along a horizontal axis between said rear edge and said front edge; and

a cutting unit comprising a saw blade holder pivotally connected to said cantilever arm unit, and a saw blade rotatably mounted in said saw blade holder,

wherein said linkage unit comprises a first link connected to said supporting unit, a second link pivotally connected to said first link, a third link pivotally connected to said first link opposite to said second link, and a fourth link pivotally connected between said second link and said third link; said cantilever arm of said cantilever arm unit is pivotally connected to said fourth link of said linkage unit; said connection member is pivotally connected between said cantilever arm and said third link, and

wherein said cantilever arm of said cantilever arm unit comprises an interlocking portion pivotally connected to a middle part of said fourth link, a pivot bearing portion disposed opposite to said interlocking portion and pivotally connected with said cutting unit, and a pivot portion disposed between said interlocking portion and said pivot bearing portion; said connection member is pivotally connected between said middle pivot-connection portion and said pivot portion.

3. The multi-link miter saw as claimed in claim 2 , wherein said cantilever arm of said cantilever arm unit further comprises an actuation portion disposed between said pivot bearing portion and said pivot portion; said cutting unit further comprises a saw blade guard rotatably pivoted to said saw blade holder, and a pull bar pivotally connected between said actuation portion and said saw blade guard; wherein said cutting unit is biasable relative to said cantilever arm unit from a ready position far from said table to a cutting position in close proximity to said table; wherein when said cutting unit is disposed in said ready position, said pull bar is operable to bias said saw blade guard relative to said saw blade holder for enabling said saw blade to be shielded by said saw blade guard; and when said cutting unit is disposed in said cutting position, said pull bar is operable to bias said saw blade guard relative to said saw blade holder and to further open said saw blade guard from said saw blade.

4. The multi-link miter saw as claimed in claim 3 , wherein said cantilever arm of said cantilever arm unit further comprises opposing first and second sidewalls disposed around said pivot bearing portion, a substantially L-shaped panel connected between said first sidewall and said second sidewall, and an accommodation chamber surrounded by said first sidewall, said second sidewall and said L-shaped panel; said saw blade holder of said cutting unit comprises a side end portion inserted into said accommodation chamber and pivotally connected to said pivot bearing portion between said first sidewall and said second sidewall.