| 摘要 |
A driver for a chain conveyor which is adapted to run in a conveyor trough which has side guide walls comprises a driver arm portion having outer side edges which terminate in a polygonal pin portion which tapers inwardly in lateral and longitudinal directions toward its outer end. A guide shoe has an inner side face with a recess into which the pin portion of the arm extend and the guide shoe is pivotally supported on the arm pin portion by a pin or sleeve element. The guide shoe includes an inwardly extending nose portion which rides between side edges of a U-shaped recess of the arm portion. Surfaces of the nose portion and the U-shaped recess of the arm defining recesses and stops for limiting the pivotal movement of the shoe. Both the shoe and the polygonal pin portion of the driving arms have aligning bores which are oblong so that the pivotal support may be shifted in lateral outer or inner directions so as to vary the clearance between outer circularly cylindrical portions of the polygonal pin portion and the guide shoe during pivotal movement of the shoe. The shoe has an outer lateral edge which engages in the side guide walls and the angular position of this edge with respect to the guide walls may be shifted to vary the cutting angle of the guide shoe. In addition, the side areas of the guide shoes may be shifted during the pivoting to vary the scraping angle.
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