Browse Prior Art Database

DOCUMENT REGISTRATION SYSTEM

IP.com Disclosure Number: IPCOM000023576D
Original Publication Date: 1978-Apr-30
Included in the Prior Art Database: 2004-Mar-31
Document File: 4 page(s) / 630K

Publishing Venue

Xerox Disclosure Journal

Abstract

A system for registering the lead edge of documents being copied on a copier platen to a desired registration position over a downstream edge area on the platen in the direction of document movement. Trail edge document sensing is not desir-able, particularly for an undersized document, where the desired registration edge is at the downstream side of the platen. With the disclosed system there are no registration gates or other document sheet stop mechanisms or sensors over or directly adjacent the platen. Thus, there are no shadows or losses of image area at either edge of the document copy.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

DOCUMENT REGISTRATION SYSTEM
Thomas N. Taylor

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Proposed Classification
U.S. Cl. 355/76
Int. Cl. G03b 27/62

A system for registering the lead edge of documents being
copied on a copier platen to a desired registration position
over a downstream edge area on the platen in the direction of
document movement. Trail edge document sensing is not desir-~
able, particularly for an undersized document, where the
desired registration edge is at the downstream side of the
platen. With the disclosed system there are no registration
gates or other document sheet stop mechanisms or sensors over
or directly adjacent the platen. Thus, there are no shadows
or losses of image area at either edge of the document copy.

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3

5

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Volume 3 Number 2 March/April 1978 123

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Page 2 of 4

DOCUMENT REGISTRATION SYSTEM (Cont'd)

A document handling unit 1 conventionally feeds the documents
onto, over and off of the opposite side of platen 2, prefer-
ably with a single large overlying light reflective belt 3.
Illustrated here is a non-slip spaced vacuum belt transport of
the type disclosed in U.S. Patent No. 4,043,665, and the Xerox
5400 copier. The document may be fed in manually or automat-
ically from a stack to the belt 3 at an input area 4. A pre-
registration gate 5 upstream of the platen 2 may be provided
to initially hold the next document before its time to be fed,
and to dc-skew it.

Instead of the belt 3 and document being stopped when the lead
edge of the document reaches the registration position, the
belt 3 here continues to move forward until a minor lead edge
portion of the document is driven out slightly beyond the
downstream edge of the platen into engagement with a switch 6
spaced downstream from the platen. The switch 6 then actu-
ates, through a control circuit 7, a reversible motor 8 which
drives the belt 3. Upon the actuation of the switch 6 by the
lead edge of the document the belt drive is immediately
reversed, but gently and slowly so as not to cause slippage
between the belt and the document. This reverse movement of
the belt 3 is only for a fixed short distance equal to the
fixed distance between the switch 6 and the desired document
lead edge registration position over the platen. The motor 8
is then automatically stopped so that the belt 3 holds the
document stationary in registration over the platen while it
is being fully imaged, either by flash exposure or by a
conventional scanning optics system. The motor 8 is then
automatically again reversed by circuit 7, after exposure...