Chain tensioning apparatus for a packaging machine

Details Chain tensioning apparatus for a packaging machine Chain tensioning apparatus for a packaging machine

1997-05-29

1999-04-20

Marmor, Charles A.

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Pulley shifter

474101, 474110, 474136, 198813, 74128, F16H 714

Patent

active

058953329

ABSTRACT:
A tensioning system for an endless chain comprising a snail cam mounted on a second shaft parallel to a sprocket shaft which supports a sprocket and chain, a follower running against the snail cam and mounted on a mechanism supporting the sprocket shaft, a ratchet device which selectively limits the rotational direction of the second shaft so that the radius of the snail cam at the follower increases with rotation, a means of applying a controlled rotational force to the second shaft to advance the ratchet device if chain tension is below a predetermined level, but not advance it if chain tension is above a predetermined level.

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patent: 5026326 (1991-06-01), Pollich et al.
patent: 5797481 (1998-08-01), Uber et al.

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