Document handler interdocument gap control system

Details Document handler interdocument gap control system Document handler interdocument gap control system

1994-10-31

1995-10-24

Moses, R. L.

Photocopying

Contact printing

Light boxes

271259, 271270, G03G 2100

Patent

active

054614686

ABSTRACT:
A document handling system for sequentially feeding document sheets to be imaged with a controlled minimized interdocument gap therebetween even though the sheet separator-feeder sequentially feeds the documents from the stack in the input tray with initial interdocument gap variations to a second transport path portion feeding the document sheets through the imaging station at a constant velocity. A first servo drive feeds the documents in a first path portion including the separator-feeder, and a second servo drive feeds the documents in a second path portion providing the constant velocity. A sheet edge sensor in the first path portion signals the passage of the lead or trail edge of document sheets. A servo controller connecting with the sheet edge sensor and the first servo drive automatically measures the initial interdocument gap variations and change the feeding of document sheets in the first path portion so as to automatically changes the interdocument gap to a preset desired minimum interdocument gap in the second path portion. Preferably the second servo drive has an encoder generating signals proportional to its drive and the servo controller counts these signals between the passage of the trail edge of one document sheet and the passage of the lead edge of the next sequential document sheet past the sheet edge sensor, to calculate control signals for the first servo drive to drive it variably longer at a higher velocity than the second servo drive.

REFERENCES:
patent: 4579444 (1986-04-01), Pinckney et al.
patent: 5339139 (1994-08-01), Fullerton et al.
patent: 5423527 (1995-06-01), Tranquilla
Xerox Disclosure Journal vol. 15, No. 5, Sep./Oct. 1990 pp. 353-354.

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