Fastener advance delay for fastener driving tool

A nailer, comprising:

• a power source including a piston reciprocating within a cylinder;
• a driver blade secured to said piston for common movement relative to a nosepiece;
• a magazine connected to said nosepiece for feeding fasteners sequentially for being driven into a workpiece by said driver blade;
• a fastener delay mechanism operatively associated with said magazine and configured for engaging a subsequent fastener and delaying advancement of the second fastener to said nosepiece until said driver blade returns to said pre-firing position after driving a leading fastener;
• said delay mechanism is operated mechanically by direct contact with said driver blade, such that, after ignition, the driver blade moving toward the fasteners activates said delay mechanism, which remains activated until said driver blade is retracted to said pre-firing position;
• and
• said delay mechanism includes a pivoting cam connected to said tool and having a first surface and a second surface, said cam being biased into a path of the driver blade, said first surface engaging said driver blade;
• said second surface engaging a biased feed pawl connected to said tool and constructed and arranged to engage the fasteners in said magazine and reciprocating between a retracted position in which the fasteners are urged toward said nosepiece in a normal operational mode, and an extended position in which said pawl is placed in the path of fastener advancement and prevents further fastener advancement until said pawl is released.