| 摘要 |
A welding wire dispensing assembly and apparatus for providing adjustment of rotational resistance in a spool includes a spool support, an axle assembly, and a resistance adjustment assembly. The spool support is rotatably mounted to the welding wire dispensing assembly. The spool support has a first end and a second end and defines between the first end and the second end a surface around which a wire spool can be mounted. The axle assembly includes an axle and a first friction member with a friction surface. The resistance adjustment assembly includes a second friction member, a force actuator, and a cam mechanism. Either the first friction member or the second friction member is substantially fixed with respect to either the spool support or the axle. The force actuator is adjustable between two positions. In a first position, the force actuator exerts a first level of interface force on one the first friction member or the second friction member, creating a first level of friction force between the first friction surface and the second friction surface. In a second position, the force actuator exerts a second level of interface force on one of the first friction member and the second friction member creating a second level of friction force between the first friction surface and the second friction surface. The cam mechanism includes a cam channel and a cam follower. The cam follower is movable between a first stop and a second stop. Movement of the cam follower to a first location in the cam channel causes the cam mechanism to at least indirectly exert a force on the force actuator to move the force actuator to the first position, and movement of the cam follower to a second location in the cam channel causes the cam mechanism to at least indirectly exert a force on the force actuator to move the force actuator to the second position.
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