| 摘要 |
<p>A screw fastening device comprising a casing (11), a motor (12) connected to the casing (11), a block body (20) rotatably housed in the casing (11) and having a pair of axially spaced plate portions (21, 22), a plurality of torque transmitting pins (26) each rotatably supported on the plate portions (21, 22) of the block body (20), the pins (26) having eccentric cam portions (33), respectively, and being rotated by the motor (12), an externally toothed gear (35) formed with engagement portions (37) engaged by the eccentric cam portions (33, 103) of the torque transmitting pins (26), an internally toothed gear (45) fixedly mounted in an inner periphery of the casing (11) so that it can engage with the externally toothed gear (35), the internally toothed gear (45) being slightly different in number of teeth from the externally toothed gear (35), and a rotational output shaft (48) connected to either one of the plate portions (21, 22) of the block body (20). <IMAGE></p> |
