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Skew Free Document Feed Mechanism

IP.com Disclosure Number: IPCOM000045852D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 95K

Publishing Venue

IBM

Related People

Kanno, T: AUTHOR [+2]

Abstract

In a printer in which a document is fed by two pairs of feed-belts located in parallel, the document tends to skew in reference to the feed direction due to mechanical tolerance of each belt and its drive mechanism. In order to compensate the skewing to keep the document straight on, it is necessary to balance the pressure of one belt against the other in both pairs of feed-belts.

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Skew Free Document Feed Mechanism

In a printer in which a document is fed by two pairs of feed-belts located in parallel, the document tends to skew in reference to the feed direction due to mechanical tolerance of each belt and its drive mechanism. In order to compensate the skewing to keep the document straight on, it is necessary to balance the pressure of one belt against the other in both pairs of feed-belts.

Referring to Fig. 1, a pulley 1 for an upper feed-belt 2 driven by a motor through a pulley 3 is supported by a lever 4 which is pivotally mounted on the machine frame by a stud 5. The upper belt 2 is biased against a lower belt 6 by a spring 9 through the pulley 1 and lever 4. The belt 6 is driven by a motor through a shaft 7 and pulley 8. The spring 9 is supported at one end by a tension adjustment mechanism 10. When a document 11 skews to the right, the spring 9 for the right pair of belts is manually adjusted to increase its tension by the associated adjustment mechanism 10 or the spring tension for the left pair of the belts is decreased by its associated mechanism lO to balance the pressure in both Pairs of belts. When the document 11 skews to the left, the left spring tension is increased or the right spring tension is decreased.

Referring to Fig. 2, each spring 9 is supported at one end of a lever 12, instead of the tension adjustment mechanism 10 in Fig. 1, which is pivotally mounted on the frame at its center by a stud 13. The lever 12 is prov...