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Browse Prior Art Database

ACTIVE OPEN NIP BUCKLE RELIEF

IP.com Disclosure Number: IPCOM000027537D
Original Publication Date: 1997-Aug-31
Included in the Prior Art Database: 2004-Apr-08
Document File: 2 page(s) / 114K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a method for releasing a buckle of transporting paper after the paper passes a decurler using active paper transporting nips. To eliminate paper curling, a decurler 1 has been introduced into the paper transporting path 2 of an image reproducing machhe as indicated in Figure 1. After the paper passes the decurler 1, the paper is again transported

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XEROX DISCLOSURE JOURNAL

ACTIVE OPEN NIP BUCKLE RELIEF

Lisbeth S. Quesnel Paul J. Degruchy

Proposed Classification
U. S. C1.399/406 Int. C1. G02g 15/00

Disclosed is a method for releasing a buckle of transporting paper after the paper passes a decurler using active paper transporting nips. To eliminate paper curling, a decurler 1 has been introduced into the paper transporting path 2 of an image reproducing machhe as indicated in Figure 1. After the paper passes the decurler 1, the paper is again transported

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XEROX DISCLOSURE JOURNAL - Vol. 22, NO. 4 July/AuguSt 1997

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ACTIVE OPEN NIP BUCKLE RELIEF (CONT'D)

along with the paper path by several paper transporting nips 3, 4. Because the tensioning of the sheet in the decurler results in non-uniform and undesired paper curl, the nearest paper nips at the downstream of the paper path are set to avoid the paper curl. In fact, the moving velocity of the nips is set to a smaller velocity than that of the decurler. However, the difference of the moving velocities cause the paper to buckle therebetween. To accommodate the paper buckle between the decurler and the nips, a buckle chamber 5 has been introduced into the paper path. However, the buckle chamber requires large amounts of space to be installed, for example, if the 11 X 17 inch paper is transported between upstream rollers, which have 20 ips (inch per second) moving speed, and downstream rollers, which have 18 ips moving speed, having 4.5 inch spacing therebetween, substantially 1.25 inch buckle height, which is almost 28% of the spacing, is required. Such a big buckle also results in lead edge rollover of the transported paper in the chamber.

This invention avoids such problems by using an active open nip for buckle relieving. In Figure 2, numerals 8, 9 are inverter rollers for inverting the paper direction. The roller 9 rotates to one direc...