Printer having print output linked to scanner input for automated image quality adjustment

• US 5,884,118 A
• Filed: 11/26/1996
• Issued: 03/16/1999
• Est. Priority Date: 11/26/1996
• Status: Expired due to Fees

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Mantell, David A., Mestha, Lingappa K.
• Primary Examiner(s): BEATTY, ROBERT B
• Application Number:
  US08/756,739
• Time in Patent Office: 840 Days
• Field of Search: 399/14, 399/15, 399/72, 399/405, 399/139
• US Class Current: 399/15
• CPC Class Codes: H04N 1/4078 using gradational references, e.g. grey-scale test pattern analysis

Abstract

An imaging machine operating components include an input scanner for providing images on copy sheets and a copy sheet path connected to the input scanner. The imaging machine is calibrated by providing an image on a first copy sheet and automatically conveying the first copy sheet to the input scanner by way of the copy path. The image on the first copy sheet is scanned and provides the image on a second copy sheet. The image on the second copy sheet is sensed and compared to a reference image to calibrate the imaging machine. The calibration sequence is automatically initiated via control data stored in a memory.

Claims

1. An imaging machine having an imaging member, operating components including a document scanner, and a control system including memory to provide images on copy sheets comprising:

a calibration image stored in memory,

control data stored in said memory for automatically initiating a calibration sequence by projecting the calibration image onto the imaging member,

a source of copy sheets, the calibration image being transferred from the imaging member to a first copy sheet,

a copy sheet path to automatically convey said first copy sheet with the calibration image to the document scanner for scanning the calibration image on said first copy sheet, the calibration image being projected onto the imaging member and transferred to a second copy sheet, and

a sensor to measure imaging machine parameters by sensing the calibration image on the second copy sheet to provide control data for machine adjustment.

2. The imaging machine of claim 1 wherein the sensor measures imaging machine parameters by sensing the calibration image on the first copy sheet to provide control data for machine adjustment.

3. The imaging machine of claim 1, wherein the calibration image stored in memory includes a test image to maintain color consistency.

4. The imaging machine of claim 1, wherein the calibration image stored in memory includes a test image to determine imaging member uniformity.

5. An imaging machine having an imaging member, operating components including a document scanner, and a control system including memory to provide images on copy sheets comprising:

a calibration image stored in memory,

a copy sheet source, the calibration image being transferred to a first copy sheet,

a copy sheet path to automatically convey the first copy sheet to the document scanner for scanning the calibration image, the calibration image being transferred onto a second copy sheet, and

a sensor to measure printing machine parameters by sensing the calibration image on the second copy sheet to provide control data for machine adjustment, the memory including stored data to automatically initiate the transfer of the calibration image to said first copy sheet.

6. The imaging machine of claim 5 including a scanner tray for receiving copy sheets scanned by the document scanner.

7. The imaging machine of claim 5, wherein automatic initiation of the transfer of the calibration image to said first copy sheet depends upon machine usage.

8. The imaging machine of claim 5, wherein automatic initiation of the transfer of the calibration image to said first copy sheet depends upon predetermined time settings.

9. The imaging machine of claim 5 including an output tray for receiving copy sheets during normal machine operation and a deflector wherein upon automatic initiation of the transfer of the calibration image to said first copy sheet triggers said deflector to inhibit copy sheets entering the output tray.

10. The imaging machine of claim 5, wherein the calibration image stored in memory includes a test image to maintain color consistency.

11. The imaging machine of claim 5, wherein the calibration image stored in memory includes a test image to determine imaging member uniformity.

12. In an imaging machine having an imaging member, operating components including an input scanner for digitizing images for projecting onto the imaging member, a source of copy sheets, a control with memory, and a transfer member to transfer images projected onto the imaging member onto copy sheets, and a paper path for conveying copy sheets with images to the input scanner, a method of calibration of the imaging machine comprising the steps of:

providing an image on a first copy sheet,

automatically conveying the first copy sheet to the input scanner by means of said paper path, responsive to data in the memory

scanning said image on the first copy sheet, projecting said image onto the imaging member, and transferring said image to a second copy sheet, and

sensing said image on the second copy sheet to calibrate the imaging machine, including the step of comparing the image on the second copy sheet to calibration data.

13. The method of claim 12 wherein the imaging machine includes a control with memory for storing calibration data and wherein the step of sensing said image on the second copy sheet to calibrate the imaging machine includes the step of comparing the image on the second copy sheet to said calibration data.

14. The method of claim 12 wherein the step of sensing said image on the second copy sheet to calibrate the imaging machine includes the step of comparing the image on the second copy sheet to the image on the first copy sheet.

15. The method of claim 12 including the steps of conveying the second copysheet to the input scanner by means of said paper path,

scanning the image on the second copy sheet and providing the image on a third copy sheet, and

sensing the image on the third copy sheet to calibrate the imaging machine.

16. The method of claim 12 wherein the image on the first copy sheet is a selected portion of a given image.

17. The method of claim 12 wherein the step of sensing said image on the third copy sheet to calibrate the imaging machine includes the step of comparing the image on the third copy sheet to the image on the second copy sheet.