| 摘要 |
Reciprocating power tools may include a rotary member or crank disk (12) that is rotatably driven by a motor (M). The rotary member (12) may be operable to selectively rotate in a first direction or a second direction. A revolving member or connection (crank) pin (14) may be coupled to the rotary member (12) and have a longitudinal axis that is parallel to, but displaced from, the rotational axis of the rotary member. Preferably, the revolving member (14) revolves or orbits about the rotational axis of the rotary member when the rotary member (12) rotates. Further, the revolving member (14) is preferably movable relative to the rotary member (12) so as to change the distance between the revolving member (14) and the rotational axis of the rotary member (12). A motion conversion mechanism (13, 17) may convert the revolving movement of the revolving member (14) into linear reciprocating movement of a working tool (B). By changing the distance between the revolving member (14) and the rotational axis of the rotary member (12), the reciprocating stroke length of the working tool (B) may be changed.
|
