Tree pruner

A tree pruner comprising:

• a base member including:
• a connector adapted to be connected to a shaft;
• a main plate longitudinally securely connected to the connector;
• a first groove defined in the main plate and downward extending to an periphery of the main plate;
• a second groove defined in the main plate and upwardly extending to the periphery of the main plate;
• and
• a roller rotatably mounted on lower end of the connector;
• a blade pivotally mounted on the main plate and including:
• a first side forming a first cutting edge corresponding to and moved within the first groove in the main plate;
• a second side forming a second cutting edge corresponding to and moved within the second groove in the main plate;
• and
• a protrusion extending from the second side of the blade;
• and
• a driving device attached to the protrusion of the blade for reciprocally driving the blade and including:
• a pulley mounted to a distal end opposite to the blade;
• a rope having a first end secured on the pulley and being coiled the roller and the pulley and a second end adapted to be hold by a user to drive the driving device;
• a spring mounted between the driving device and the main plate to provide a restitution force to the driving device, the spring having two opposite ends respectively securely connected to the driving device and the main plate;
• and
• a lever attached to the second side of the blade and an auxiliary rod slidably mounted on the lever, the auxiliary rod selectively longitudinally extending relative to the lever to elongate a moment of the driving device.