| 摘要 |
The rotary flap wheel has a plurality of radially extending finishing units mounted in a circumferential series on a rotary hub structure. The finishing units on the hub structure may be all abrasive type finishing packs or abrasive finishing packs used in combination with finishing units or packs of other materials as an example, sisal or cotton. Each finishing pack provided with abrasive working surfaces includes a stack of abrasive sheets clamped at their inner radial ends between the arms of a clamping element or clip, which is mounted on the hub structure by an elongated pin located adjacent the outer periphery of the hub structure. Each abrasive finishing pack has a leading sheet, a trailing sheet, and a plurality of intermediate sheets between the leading and trailing sheets, with the sheets having a relatively abrasive surface on one circumferential side thereof and a relatively non-abrasive or smooth-faced surface on the opposite side thereof. The leading sheet of each abrasive finishing pack has the abrasive surface thereon disposed to face opposite to the direction of rotation of the hub structure, with the intermediate and trailing sheets of each abrasive finishing pack having the abrasive surfaces thereon facing uniformly in the direction of rotation of the hub structure. Thus, the non-abrasive or smooth-faced external surface of the leading sheet of each abrasive finishing pack engages a non-abrasive or smooth-faced surface on the trailing side of the finishing unit located forwardly thereof in the direction of rotation of the hub structure.
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