| 摘要 |
The present invention relates to an endless conveyor grader (1) suitable for use in grading tubers (4) or the like. The endless conveyor comprises an endless grid screen (21) supported on endless drive transmission means (37) at opposite sides (23, 25) of said endless grid screen (21). There are provided at opposite sides (23, 25) of the endless grid screen (21) pathway, endless drive transmission guide means (36, 39) formed and arranged so as to define at least one cascade (40) or step (40) in the endless grid screen pathway. The cascade(s) or step(s) (40) allow for tumbling, in use of the grader, of tubers (4) passing over the cascade(s) (40) or step(s) so as to provide the required movement of the tubers (4) on the grid screen (21) to facilitate the grading process. The grid screen comprises parallel support bars provided with a multiplicity of 'I'-shaped link members (46) bridging between the support bars (47) so as to allow the grid screen to change direction in the endless grid screen pathway.
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