Tree pruner

A tree pruner comprising:

• a fixation seat provided at a bottom end thereof with a connection portion which is fastened to a handle and is provided with a first pulley, said fixation seat further provided at a top end thereof with a hook;
• a cutter fastened pivotally at its midsegment with said fixation seat and provided at one end thereof with a blade, and at an opposite end thereof with an extension arm having a locating hole, said blade being used to cut a tree twig in conjunction with said hook of said fixation seat;
• a link rod pivoted at a bottom end thereof with the top end of said fixation seat and provided at a top end thereof with a second pulley which is connected to said first pulley of said fixation seat by a pull cord, said link rod further provided with a torsion spring whereby said torsion spring is disposed at a pivoting portion at which said link rod is pivoted with said fixation seat;
• and
• an auxiliary rod member comprised of a support rod and an expandable push rod, said support rod being pivoted at one end thereof with said link rod and at an opposite end thereof with said locating hole of said extension arm of said cutter, said expandable push rod being pivoted at one end thereof with the top end of said link rod and at an opposite end thereof with said support rod whereby said other opposite end of said support rod is located in said locating hole of said cutter at the time when said pull cord is pulled by an external force.