Browse Prior Art Database

RELEASE OF NARROW TRANSFER BLADE FROM STOCK

IP.com Disclosure Number: IPCOM000027063D
Original Publication Date: 1995-Feb-28
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 136K

Publishing Venue

Xerox Disclosure Journal

Abstract

A transfer blade is a blade that is used to hold down the back end of a sheet in the paper path as it reaches the photoreceptor. The transfer blade causes the sheet to be pressed against the photoreceptor, thereby resulting in a better transfer of the image onto the sheet.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

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RELEASE OF NARROW TRANSFER BLADE FROM STOCK US. C1.355/274 Gary W. Roscoe

Proposed Classification

Int. C1. G03g 15/16

Regular Transfer Blade Release

Program

Release Transfer

Input Paper Width and Calculate Time Period for Paper

Stock

Start Time

(F)

XEROX DISCLOSURE JOURNAL - Vol. 20, No. 1 January/February 1995 57

[This page contains 1 picture or other non-text object]

Page 2 of 4

RELEASE OF NARROW TRANSFER BLADE FROM STOCK (Cont'd)

A transfer blade is a blade that is used to hold down the back end of a sheet in the paper path as it reaches the photoreceptor. The transfer blade causes the sheet to be pressed against the photoreceptor, thereby resulting in a better transfer of the image onto the sheet.

For tab stock, the blade has to be brought down precisely 3 millimeters in from the lead edge of the sheet and then precisely released at 0 millimeters plus or minus a millimeter in from the trail edge of the tab. Therefore, timing is crucial because premature pressing or releasing of the blade can cause substantial damage to the photoreceptor.

Since timing is crucial, both the bringing down and the release of the transfer blade from the sheet to a recognizable event is needed which is used in the timing of the actions. This event should be a signal that precisely and consistently describes the position of the sheet in the paper path.

For non tabbed stock, the process of releasing the blade off of the sheet is timed with respect to a registration sensor. As the trail edge of the sheet reaches the registration sensor, it is properly assumed that there will be a fixed time period before that same trail edge will reach the photoreceptor. After this fixed time, the transfer blade can be released precisely from the sheet.

A problem arises when the paper stock is less than 8" in width. The distance between the registration sensor and the photoreceptor is about 8". Therefore, for a sheet less than 8" in width, the trail edge will leave the registration sensor before the blade has a chance to come down on the lead edge of the sheet. In other words, the trail edge transition at the registration sensor will not be seen and the bla...