Adjustment mechanism for adjusting depth at which pneumatic nailing machine drives nails into workpiece

A pneumatic nailing machine for driving a nail into a workpiece, the pneumatic nailing machine including:

• a main body;
• a handle extending from the main body;
• a nose provided to the main body, the nail being protrudable from the nose;
• a trigger pivotally supported to the main body and positioned close to the handle for starting a nail driving operation;
• a push lever vertically movably supported to the main body, the push lever having a lower tip portion positioned near the nose and an upper tip portion positioned near the trigger;
• a driving rod supported in the main body and movable in an axial direction thereof, the driving rod being moved along the nose upon manipulation of the trigger;
• a nail driving depth controlling mechanism for controlling a distance between a lower tip end of the nose and a lower tip end of the push lever when the push lever is pressed against the workpiece;
• and the improvement comprising;
• the nail driving depth controlling mechanism having an adjustment mechanism, the adjustment mechanism comprising an eccentric body rotatably supported in the main body, an eccentric rotation of the eccentric body changing a vertical position of the eccentric body, the eccentric body being positioned above the upper tip portion of the push lever, and a position of the upper tip portion of the push lever being regulated by the position of the eccentric body, such that said adjustment mechanism defines an uppermost limit of movement of the push lever, the adjustment mechanism being positioned near the handle and being positioned on an opposite side of the trigger from a side on which the lower tip end of the nose is located.