Browse Prior Art Database

COPIER (GREY SHUTTER)

IP.com Disclosure Number: IPCOM000023574D
Original Publication Date: 1978-Apr-30
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 252K

Publishing Venue

Xerox Disclosure Journal

Abstract

In xerographic copiers having scanning systems, it is useful to calibrate the machine by exposing a grey scale. In this arrangement a grey shutter is arranged to be moved into the line of sight of the copying system during rescans,

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

COPIER (GREY SHUTTER) Peter Frederick Clark

Proposed Classification
U~S. Cl, 96/27E
Int, Cl, G03c 5/04

I

6

54RESCAN

3

/

4 6

END OF RESCAN

4

3 SCAN

In xerographic copiers having scanning systems, it is useful
to calibrate the machine by exposing a grey scale. In this
arrangement a grey shutter is arranged to be moved into the
line of sight of the copying system during rescans,

The Figures show the scan carriage (1) in three positions~ A
grey shutter (2) is slidably mounted on the carriage (1) which
also carries a mirror (3) and lamp (4) During rescan the
shutter (2) is positioned so that illumination from the lamp
(4) is reflected from the shutter (2) along the optical path
to the photoreceptor of the copier to form a grey image.

5

6

Volume 3 Number 2 March/April 1978 95

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

Page 2 of 2

COPIER (GREY SHUTTER) (Cont~d)

At the end of rescan, the shutter (2) impacts a buffer (5)
which moves the shutter to the right with respect to the
carriage (1) During scanning, the shutter (2) is positioned
so that the shutter is no longer in the line of sight of the
photoreceptor~ At the end of the scan, the shutter (2)
impacts a buffer (6) which moves the shutter to the left in
readiness for a next rescan,

XEROX DISCLOSURE JOURNAL

96 Volume 3 Number 2 March/April 1978

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