Browse Prior Art Database

VARIABLE DETACK LEVEL STRATEGY TO FACILITATE LEAD-EDGE STRIPPING

IP.com Disclosure Number: IPCOM000025011D
Original Publication Date: 1983-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 97K

Publishing Venue

Xerox Disclosure Journal

Abstract

This disclosure relates to a method of facilitating lead-edge stripping of a copy sheet from a photoreceptor and more particularly, it relates to apparatus for varying the electrostatic detack level in order to facilitate lead-edge stripping.

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EROX DISCLOSURE JOURNAL

VARIABLE DETACK LEVEL STRATEGY TO FACILITATE LEAD-EDGE STRIPPING Mark S. Jackson

Proposed Classification
U.S. CI. 355/3R Int. C1. G03g 15/00

This disclosure relates to a method of facilitating lead-edge stripping of a copy sheet from a photoreceptor and more particularly, it relates to apparatus for varying the electrostatic detack level in order to facilitate lead-edge stripping.

Present detack devices fulfill two roles: removing charge from (or reversing polarity of) the lead edge of the copy to facilitate stripping from the photoreceptor after transfer, and neutralizing copy potential in the body of the copy to prevent electrostatic toner disturbance before fusing. Excessive detack levels can lead to retransfer from paper to photoreceptor (e.g., hollow character defect); thus, some current products employ switching of the detack device between "lead edge" mode
(e.g., DC of polarity opposite that of transfer) and "body" mode (e.g., ,AC to neutralize paper potential). There remains a tradeoff between reliable stripping and lead-edge copy quality, the severity of which is architecture-dependent.

For a given architecture (radius of photoreceptor at strip point), the stress case for stripping involves weak paper (e.g., wet 13#) curled toward the photoreceptor. The desirability in principle of increased detack levels in this case is widely recognized, despite possible degradation of lead-edge copy quality, although in practice this is not currently being done.

Another important driver of stripping problems is the absence of toner in the lead- edge region. A clean sheet of paper (no image, low background) is difficult to strip. On the other hand, in this case there is - no copy quality impact involved in increasin...