Browse Prior Art Database

SMART DECURLER

IP.com Disclosure Number: IPCOM000027180D
Original Publication Date: 1995-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 130K

Publishing Venue

Xerox Disclosure Journal

Abstract

Color copiers and printers frequently produce color prints which exhibit excessive curl. This curl develops, for example, when toner shrinks on one side of the paper while the other side expands due to moisture reabsorption. The curl develops after a time period of approximately six seconds. If the sheet is not constrained or otherwise pressed, the curling process can continue for several days.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

SMART DECURLER

Classification Proposed Suzzette Solano Resto U.S. C1.355/309

Int. C1. G03g 15/00

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7"

- 15

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Page 2 of 4

SMART DECURLER (Cont'd)

Color copiers and printers frequently produce color prints which exhibit excessive curl. This curl develops, for example, when toner shrinks on one side of the paper while the other side expands due to moisture reabsorption. The curl develops after a time period of approximately six seconds. If the sheet is not constrained or otherwise pressed, the curling process can continue for several days.

The formation and degree of sheet curl is affected by a variety of factors to include: (a) the amount of toner on the copy; (b) the substrate (such as a transparency or various paperdheavy stocks; (c) paper fiber direction (due to a high percentage of manufacturers who make paper with the long fibers oriented in the long edge direction); (d) a paper's mechanical deformation characteristics (as may be induced by a mechanical decurler); and others. A variety of solutions are available to quantify and evaluate these factors. For example, the amount of toner applied to the sheet can be interpolated from an input scanner readout or a sensor array. Fused toner temperature may be sensed in the machine to detect if it is a transparency or plain paper. A paper's mechanical deformation is determined by the amount of penetration achieved by the mechanical decurler. Further, the toner and paper modules of elasticity and the moisture gradient can be obtained from historical databases and empirical information, respectively.

It is proposed to use this information obtained from the printer (amount of toner, if it is transparency or paper, and paper's feeding direction) in conjunction with an adjustable mechanical decurler in order to reduce, minimize or even eliminate final output sheet curl. The present system uses the raster input scanner determined the amount of toner to be put on the copy. A transparency sensor determines whether it is transparency or paper. The machine's paper tray...