Browse Prior Art Database

REVERSING REGISTRATION ROLLER SYSTEM

IP.com Disclosure Number: IPCOM000026552D
Original Publication Date: 1992-Oct-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 109K

Publishing Venue

Xerox Disclosure Journal

Abstract

The purpose/function of a registration system is to align a copy sheet with an image on a photoreceptor prior to transfer of that image to the copy sheet. One method for accomplishing this includes the use of a stalled roll registration system consisting of a nip formed between a driver roll and a spring loaded idler roll. The rolls are 10 mm wide and mounted to a shaft approximately 175 mm apart. The lead edge of a copy sheet is driven into the nip and stopped while the trail edge of the copy sheet continues to be driven for a short period of time. This action causes a buckle to form between the nip/gate and pre-registration drive roll.

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XEROX DISCLOSURE JOURNAL

REVERSING RE GISTRATION ROLLER SYSTEM
August Hoyer

Proposed Classification
U.S. C1.2711226 Int. C1. B65h 9/00

The purpose/function of a registration system is to align a copy sheet with an image on a photoreceptor prior to transfer of that image to the copy sheet.

One method for accomplishing this includes the use of a stalled roll registration system consisting of a nip formed between a driver roll and a spring loaded idler roll. The rolls are 10 mm wide and mounted to a shaft approximately 175 mm apart. The lead edge of a copy sheet is driven into the nip and stopped while the trail edge of the copy sheet continues to be driven for a short period of time. This action causes a buckle to form between the nip/gate and pre-registration drive roll.

The purpose of the buckle is to provide a sufficient amount of the copy sheet in a buckle chamber with appropriate horizontal force components acting on the lead edge in the direction of the nip so that a skewed copy sheet is able to position itself with the lead edge squarely and equal distance in the nip prior to being fed to the photoreceptor for image transfer.

The stalled roller system has proven to be effective with input skew limit to about 10 to 15 mrad. To correct for a large amount of skew, a large buckle is required so that a sufficient amount of a copy sheet is available is in the buckle chamber for the lead edge to move or deflect freely into the nip to achieve the deskew function. However, a large buckle weakens the beam strength of the copy sheet and the lead edge of the copy sheet cannot be controlled effectively, and therefore, the stall roll configuration becomes ineffective as a deskew mechanism.

Accordingly, a reversing registration...