Browse Prior Art Database

LOW INERTIA DOCUMENT REVERSING DRUM

IP.com Disclosure Number: IPCOM000024950D
Original Publication Date: 1983-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 73K

Publishing Venue

Xerox Disclosure Journal

Abstract

A low inertia (high speed) inverter for a recirculating document handler (QDH) in which the existing reversible rollers are replaced by a low-mass, shaftless, thin annular sleeve roller mounted on a large but stationary air bearing. The sleeve roller has a reversible external pinch roller drive.

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EROX DISCLOSURE JOURNA L

LOW INERTIA DOCUMENT REVERSING DRUM U.S. CI. 271/186 Ralph A. Hamaker

Proposed Classification

Int. C1. R65h 29/00

A low inertia (high speed) inverter for a recirculating document handler (QDH) in which the existing reversible rollers are replaced by a low-mass, shaftless, thin annular sleeve roller mounted on a large but stationary air bearing. The sleeve roller has a reversible external pinch roller drive.

Recirculating document handlers for duplexing are designed to invert the original prior to its return delivery into the feed tray as described, for example, in U.S. Patent No. 4,278,344. This may be accomplished by momentarily "storing" the document by wrapping it with keeper belts around the periphery of spaced (segmented) cylindrical spools that cyclically reverse their direction of rotation. The spools must present a minimum moment of inertia to the drive mechanism in order to provide reversal within a given time frame. This may be accomplished by minimizing their section modulus and number of segments per document width. But limiting the number of spool segments increases the chance for jams as the document is passed from a transport belt to the reversal spools. That is, lighter weight documents can between the spool segments and jam or wrinkle as they enter the keeper belts zone. Also, the moment of inertia reduction is limited by the structural rigidity required by the drive.

In this system, a thin, rotatable, air bearing cylindr...