| 摘要 |
A tracking assembly (10) for tracking belts (12, 52) and webs comprises a support frame (20) which is adapted to be mounted below a travelling belt or web. A straight or angled support shaft (30) is pivotal ly mounted at its centre via a post (32) which is rotatable within bush (26, 56) on the support frame. A selected arc of rotation of the post within the bush (26, 56) is determined by an adjustable limit stop arrangement which can take the form of a pair of grub screws. A roller is mounted onto each end of the shaft (30). The two rollers (36, 50) have tapered ends (38, 54). When the belt or web travels off centre it will come into contact with the tapered end of the roller on the side to which the belt has moved. This will cause the shaft to pivot about a vertical axis of the post (32) and thereby steer the belt back to a central position.
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