Browse Prior Art Database

PRECISE TIMING OF THE RELEASE OF THE TRANSFER BLADE FROM TABBED STOCK

IP.com Disclosure Number: IPCOM000027062D
Original Publication Date: 1995-Feb-28
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 140K

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 a developed image onto the sheet.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

PRECISE TIMING OF THE RELEASE OF THE TRANSFER BLADE FROM TABBED STOCK Gary W. Roscoe

Proposed Classification

U.S. C1.355/274 Int. C1. G03g 15/16

Regular Transfer Blade Release

Release Transfer Blade

Period for

Period

(End)

XEROX DISCLOSURE JOURNAL - Vol. 20, No. 1 January/February 1995 53

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PRECISE TIMING OF THE RELEASE OF THE TRANSFER BLADE FROM TABBED 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 a developed 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 with tabbed stock. The trail edge of a tab sheet does not have a predictable trail edge. A tab can be placed anywhere along the length of a trail edge, thus a trail edge detected by the registration sensor could represent a trail edge of the tab or a trail edge of the main body of the tab sheet. In other words, the sensing by the registration sensor is not an event which to base the timing of the release of the transfer blade because it cannot be predicted whether the tab will be positioned over the registra...