| 摘要 |
Rotationally mounted ring-shaped index dial platforms for sequential production-line operations, container filling and like incremental-step operations are provided with positive latching mechanisms, on the underside of the ring-shaped platform, each of a series of stepping latch blocks is provided with a radially extending indexing face engaging a drive roller mounted upon an unlatching cam, rotatably mounted in an underlying support housing which provides firm rotational support for the ring-shaped index dial platform. The rotation of the unlatching cam automatically retracts the latch mechanism from engagement with one of the latch blocks, freeing the ring-shaped platform for indexing rotation. The drive roller is moved by cam rotation into engagement with the latch block's indexing face. Continuing cam rotation causes orbital movement of the drive roller, indexing the latch block through a predetermined angular sector in Geneva fashion, and bringing the next latch block into latching position, after which the cam releases the retracted latch mechanism for engagement with the newly indexed latch block, providing firm, positive angular positioning of the ring-shaped index dial platform in its new position. Continuing rotation of the cam brings the indexing roller around the newly indexed latch block for engagement with its radially extending indexing face to begin the next indexing operation. The latching and indexing mechanisms are closely juxtaposed to the ring-shaped platform, leaving a large unobstructed central opening free for installation of tooling and delivery of energy, operating fluids or workpieces to the platform.
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