Cutting stroke-adjustable pruning shears

A cutting stroke-adjustable pruning shears comprising:

• a fixed jaw;
• a movable jaw having a middle part pivoted to a middle part of said fixed jaw for making a scissors action with said fixed jaw and an elongated slot near a rear side thereof, said elongated slot having a plurality of retaining notches arranged along a long side thereof;
• a holder shell having two parallel side panels and a spine connected between said parallel side panels at one side and defining with said parallel side panels a receiving space, said side panels each having a front extension lug respectively pivoted to said fixed jaw at two sides and spaced from the rear side of said movable jaw, thereby keeping said spine at an outer side relative to the rear side of said movable jaw;
• a coupling arm coupled between said holder shell and said movable jaw, said coupling arm having a first end inserted into the receiving space inside said holder shell and pivoted to the parallel side panels of said holder shell, and a second end mounted with a pivot, the pivot at the second end of said coupling arm being inserted through the elongated slot of said movable jaw and selectively positioned in one of the retaining notches of said movable jaw;
• a tension spring mounted in the receiving space of said holder shell, said tension spring having a first end fastened to a part of said holder shell remote from said front extension lugs of said parallel side panels and a second end fastened to the outmost periphery of the first end of said coupling arm;
• and
• two handles respectively fastened to a rear side of said fixed jaw and a rear side of said holder shell.