Powered fastener driver

A fastener driver comprising:

• a housing defining a head portion and a handle portion;
• a drive mechanism positioned within the housing;
• a firing mechanism including a piston and a driver blade that are moveable from a top dead center (TDC) position toward a bottom dead center (BDC) position;
• and
• a lifter assembly operated by the drive mechanism to rotate about a rotational axis to return the piston and the driver blade towards the TDC position, the lifter assembly including
• a first eccentric pin located at a first radial distance relative to the rotational axis, and
• a second eccentric pin located at a second radial distance relative to the rotational axis, the second radial distance being less than the first radial distance.

A fastener driver comprising:

• a housing defining a head portion and a handle portion;
• a drive mechanism positioned within the housing;
• a firing mechanism including a piston and a driver blade that are moveable from a top dead center (TDC) position toward a bottom dead center (BDC) position;
• and
• a lifter assembly operated by the drive mechanism to rotate about a rotational axis to return the piston and the driver blade towards the TDC position, the lifter assembly including
• an input shaft;
• a hub coupled for co-rotation with the input shaft and integrally formed therewith as a single piece;
• a first eccentric pin located within a first recess in the hub at a first radial distance relative to the rotational axis, and
• a second eccentric pin located within a second recess in the hub at a second radial distance relative to the rotational axis, the second radial distance being less than the first radial distance.