| 摘要 |
The invention concerns a roller sifting or dispersing machine for the classification or dispersing of wood chips, fibers, or similar materials, having at least one roller set composed of several rollers axially aligned in parallel and having the same rotation direction; together, these rollers form a roller bed that extends longitudinally at right angles to the rollers and is equipped with an input end for the material to be sieved and an output end for the course material, whereby each roller's upper side turns toward the output end; the rollers are equipped with numerous annular groove s axially equi-spaced and separated by annular crosspieces that form the outer sheathi ng surface of the roller. Adjacent rollers are arranged so that the annular cro ss members of one roller are opposite the annular grooves of the other roller, thus bei ng largely closed along their circumference when viewed along the roller bed surface, b ut having openings for the passage of chips in the direction perpendicular to the roll er bed surface. For improved sifting or classification the invention proposes that the annular grooves as well as the annular crosspieces be located perpendicular to the roller surface and that the outer sheathing surface of each annular crosspiece be equipped with circumferentially aligned teeth whose leading sides are shaped more steeply than their back edges leading to the base of the following tooth side, whereby an axial view of the annular crosspiece teeth is seen as a gradient that is in the opposit e direction to that of the adjacent roller but is of the same height.
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