| 摘要 |
A scroll saw including an adjustable tensioning mechanism is disclosed. The saw includes a housing having an inner surface and a pivoting arm having a rearward end disposed within an opening in the housing. A first blade clamp is disposed at the forward end of the pivoting arm and secures the upper end of a saw blade. The lower end of the saw blade is secured in a second blade clamp disposed at the forward end of a lower arm. A wedge is disposed within the housing, in contact with the inner surface of the housing. The wedge also is disposed in contact with and translatable along a surface of the pivoting arm. A rod is linked to the wedge at one end and extends through the pivoting arm. The rod includes an upwardly turned arm. A cam having a spiral track is rotatably mounted at the front of the pivoting arm with the upwardly turned arm disposed in the track. Rotation of the cam causes the track to move along the upwardly turned arm, further causing the rod and wedge to move forwardly, with the contact between the wedge and the inner surface causing the wedge and the rearward end of the pivoting arm to pivot downwardly, and the forward end of the pivoting arm to pivot upwardly to increase the tension of the blade.
|
