Importance

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Abstract

A self-adjusting contact mechanism is provided for a belt drive system which mechanism includes a contact shoe having a low friction surface in contact with the belt and a mechanism for biasing the low friction surface of the contact shoe against the belt with a controlled force profile which may be constant or may vary within a selected range over the permitted movement for the shoe. The shoe is preferably mounted to a lever arm through a pivot joint to permit the shoe to remain substantially parallel to the belt and in contact with the belt over the entire low friction surface of the shoe regardless of lever arm position. Force on the lever arm is provided by a compression mechanism which may include a pair of counterbalancing springs, with the spring biasing the lever arm toward the belt being stronger than the counterbalancing spring and preferably with the force for at least one of the springs being adjustable. The controlled force profile may be a substantially constant force regardless of contact shoe position.

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First Claim