| 摘要 |
A holding assembly for maintaining a blade in an operative position on a movable support, which holding assembly has an elongate housing assembly having a first wall with a first pressure applying surface facing transversely to the length of the elongate housing assembly in a first direction, and a plate assembly having a second wall with a second pressure applying surface. With the elongate housing assembly and plate assembly in operative relationship, the first and second pressure applying surfaces face oppositely to each other so that there is a thickness between the first and second pressure applying surfaces. The first and second walls are repositionable selectively towards and away from each other with the elongate housing assembly and plate assembly in operative relationship to thereby vary the thickness between the first and second pressure applying surfaces. The holding assembly further includes a slide bar between a part of the elongate housing assembly and a part of the plate assembly that is guided by at least one of the elongate housing assembly and plate assembly in movement relative to the at least one of the elongate housing assembly and plate assembly lengthwise of the elongate housing assembly. The slide bar has first and second discrete cam surfaces spaced from each other lengthwise relative to the elongate housing assembly. Second and third cam surfaces are provided on at least one of the elongate housing assembly and plate assembly. The second and third cam surfaces cooperate one each with the first and second cam surfaces to cause the first and second walls to be wedged away from each other as the slide bar is moved in one direction lengthwise relative to the elongate housing assembly to thereby vary the thickness between the first and second pressure applying surfaces.
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