Patent ID: 11951601
Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 7:
8. A powered fastener driver comprising:
a driver blade movable from a top-dead-center position to a driven or bottom-dead-center position for driving a fastener into a workpiece;
a drive unit for providing torque to move the driver blade from the bottom-dead-center position toward the top-dead-center position;
a rotary lifter engageable with the driver blade, the lifter configured to receive torque from the drive unit in a first rotational direction for returning the driver blade from the bottom-dead-center position toward the top-dead-center position, the lifter having a body and a drive pin coupled to the body;
a roller positioned on the drive pin and configured to engage with a tooth of the driver blade when moving the driver blade from the bottom-dead-center position toward the top-dead-center position, wherein the roller includes a first engagement section configured to receive an end portion of the tooth of the driver blade and a second engagement section;
an engagement member positioned within a recess formed in the rotary lifter, the engagement member biased into engagement with the roller and configured to position the roller in a first rotational orientation relative to the body of the rotary lifter so the end portion of the tooth of the driver blade aligns with the engagement section of the roller, and
a biasing member is positioned within the recess and is configured to bias the engagement member into contact with the second engagement section of the roller.