| 摘要 |
1,197,554. Endless conveyers. DIAMOND INTERNATIONAL CORP. 17 Feb., 1969 [23 Sept., 1968], No. 8514/69. Heading B8A. In a conveyer having a pair of support sprockets 24 over which are entrained a pair of endless conveyer chains 28 defining upper, transitional, and lower, runs, U, T and L, support shafts 50 journalled on, and extending transversely of, the conveyer chains 28, to which support trays 38 are secured, and means for maintaining the trays in a stable attitude, leading and trailing followers 68 are connected to the support shafts 50 and are disposed 180 degrees out-of-phase with respect to each other. Guide-track means 72 are disposed substantially parallel with the upper and lower conveyer runs U and L for engagement by the respective followers 68 for maintaining the support trays 38 stable, and travelling control means are provided adjacent one of the support sprockets for movement therewith through the transitional path T. The travelling control means include abutments 76 engageable with the leading follower 68 during substantially 180 degrees of said transitional path of travel about the support sprocket between the upper and lower conveyer runs for aiding to maintain the trays 38 stable; first supplemental guide means 88 adjacent the transitional path of travel of the one support sprocket and substantially parallel ing the last 90 degrees thereof for engaging the leading follower 68 and co-operating with the abutments 76 for maintaining the trays 38 stable and second supplemental guide means 42 (most clearly seen in Fig. 1, not shown) substantially paralleling the first 90 degrees of the transitional path T of the other support sprocket 24 and engageable by the trailing follower 68, for co-operating with the abutments 76 and aiding to maintain the trays 38 in the stable position. The abutments 76 are each carried by a respective member 74 (Fig. 5) which is slidable between guides 72 carried by the associated sprocket 24. The inner end of the member 74 carries a follower 78 which bears on a fixed cam track 84, 86, concentric with the rotational axis of the sprockets 24. The tension of the conveyer chains may be adjusted by the action of hydraulic rams (18) (Fig. 1, not shown). |
