Fastener Driving Tool Trigger Assembly

A mechanical timer mechanism can include a driven gear mounted to a rotary damper and a drive gear operably coupled to the driven gear. In bump mode, movement of a trigger to its firing position can initially move the drive gear into its wind-up position. Thereafter, a contact trip can move the drive gear to its wind-up position and an actuator of the trigger to its firing position each time the contact trip is activated, unless the timing mechanism has timed out between firings. In sequential mode, the drive gear can be moved into a timer lock-out position which holds the contact trip in a bypass position in which the contact trip will not engage the actuator of the trigger unless the trigger is moved to its firing position prior to activation of the contact trip.