| 摘要 |
A powered hand-held fastening tool includes a housing defining a handle, a frame, a motor-driven flywheel journaled to the frame, and an elongated driver that is selectively coupled to the flywheel to drive a fastener into a workpiece. A follower assembly for selectively coupling the driver to the flywheel includes a solenoid actuator, a biasing mechanism, a lever arm connected between the solenoid actuator and the biasing mechanism, and an intermediate member having journaled thereto a pivot roller and a pinch roller. Upon energization of the solenoid the lever arm is moved in a direction parallel to the drive axis, thereby applying a force on the pivot roller perpendicular to the drive axis, causing the pinch roller to press the driver against the flywheel and initiate the drive stroke. The intermediate member pivots about the pivot roller to release the pressure on driver upon completion of the drive stroke. |
| 主权项 |
1. A powered hand-held fastening tool for applying fasteners including a housing defining a handle, a frame, a motor driven flywheel journaled to said frame, an elongated driver disposed adjacent to said flywheel and configured to move along a drive axis to engage and drive a fastener into a workpiece, and a follower assembly for selectively coupling said driver to said flywheel, said follower assembly comprising:
a longitudinal bracket fixedly connected to said frame generally parallel to said drive axis and having a first end, a second end opposite said first end, and spaced apart generally parallel arms; an actuator comprising a solenoid having a plunger that is movable in response to energization of said solenoid, said actuator being mounted between said arms at said first end of said bracket; a biasing mechanism having a compression spring, said biasing mechanism being mounted between said arms at said second end of said bracket; a lever arm being connected at one end thereof to the plunger of said solenoid and at its other end to said biasing mechanism; and an intermediate member located between said actuator and said biasing mechanism and mounted between said arms via a first axle pin that is received within a first pair of opposing slots formed in said arms, said first pair of opposing slots being oriented to permit movement of said first axle pin along a second axis perpendicular to said drive axis, said first axle pin having journaled thereto a first roller that engages an intermediate segment of said lever arm between said one end and said other end, said intermediate member further having mounted thereto a second axle pin having journaled thereto a second roller disposed adjacent to said driver; wherein upon energization of said solenoid said plunger moves said lever arm in a direction parallel to said drive axis, causing said intermediate segment to apply a downward pressure on said first roller directed along said second axis, which in turn presses said second roller against said driver, thereby squeezing said driver between said second roller and said flywheel. |
