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Adjustable retard idler for document feeder

IP.com Disclosure Number: IPCOM000208192D
Publication Date: 2011-Jun-24

Publishing Venue

The IP.com Prior Art Database


Copiers, printers, and scanners typically use a subsystem known as a “document feeder” to feed sheets of paper for either printing or scanning purposes. One specific type of document feeding mechanism is generically known as a fully active retard (FAR) feeder. This idea proposes an improvement to the existing known FAR feeder mechanism design. This design has its retard clutch on a shaft offset from the retard roll with a belt drive arrangement. The suggested improvement is to allow for an adjustable idler roll position to improve the feeder’s performance. By allowing the position of the idler on the tight side of the belt to be adjustable, the cramming force can be manipulated. This is because the idler position will affect the direction of the belt tension force. Reducing the cramming force will reduce the rate of multi-feed, as the net separation force will be greater. On the other hand, increasing the cramming force provides extra drive, which is advantageous when feeding heavy and/or high stiffness media.