Issue detection in a digital printer

• US 8,870,329 B2
• Filed: 01/31/2012
• Issued: 10/28/2014
• Est. Priority Date: 01/31/2012
• Status: Active Grant

• Current Assignee: Hewlett-Packard Indigo BV (HP Inc.)
• Original Assignee: Hewlett-Packard Indigo BV (HP Inc.)
• Inventors: Abbo, Haggai, Chauvin, Martin, Flum, Omry, Baril, Yuri, Nagler, Sharon, Breen, Craig, Druckman, Shai, Shiff, Ami, Arnstein, Avner
• Primary Examiner(s): Shah, Manish S
• Assistant Examiner(s): AMEH, YAOVI M
• Application Number:
  US13/362,728
• Publication Number:
  US 20130194340A1
• Time in Patent Office: 1,001 Days
• Field of Search: 347/16, 347/224, 347/225, 347/228, 347/232, 347/233, 347/245, 347/248
• US Class Current: 347/16
• CPC Class Codes: B41J 11/42 Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering
• CPC Class Codes: B41J 29/38 Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
• CPC Class Codes: G03G 15/04072 by laser
• CPC Class Codes: G03G 15/0435 by introducing an optical element in the optical path, e.g. a filter
• CPC Class Codes: G03G 15/55 Self-diagnostics; Malfunction or lifetime display
• CPC Class Codes: G06K 15/1219 Detection, control or error compensation of scanning velocity or position, e.g. synchronisation G06K15/1223 takes precedence

Abstract

Detecting an issue in a digital printer that has an optical element positioned to direct a laser beam towards a photoconductor surface may include sending optical element position commands to move the optical element to compensate for inconsistent movements of a photoconductor drum and creating a record of the optical element position commands.

Claims

1. A method for detecting an issue in a digital printer, comprising:

sending optical element position commands to move an optical element to compensate for inconsistent movements of a photoconductor surface, said optical element positioned to direct a laser beam towards said photoconductor surface;

creating a record of said optical element position commands; and

comprising analyzing said record to detect an issue;

wherein analyzing said record to detect an issue is performed in real time.

2. The method of claim 1, wherein said analyzing identifies a component of said digital printer that is likely contributing to said inconsistency in said movement of said photoconductor surface.

3. The method of claim 1, wherein said record comprises at least one parameter selected from a group consisting of time, an angular position command of said optical element, machine angle, position command of said motor, actual position of said motor, speed command of said motor, actual speed of said motor, electrical current command to said motor, actual electrical current of said motor, and combinations thereof.

4. The method of claim 1, further comprising sending said record to a remote location.

5. The method of claim 1, further comprising displaying at least one parameter of said record.

6. The method of claim 1, wherein said photoconductor comprises a rotating drum and said record comprises a sampling frequency faster than a frequency of said photoconductor drum rotation.

7. The method of claim 1, wherein said photoconductor comprises a drum and sending optical element position commands to move an optical element to compensate for inconsistent movements of a photoconductor surface includes sending optical element position commands based on output from a position sensor that reads an angular position of said photoconductor drum.

8. A system for detecting an issue in a digital printer, comprising:

an optical element positioned to direct a laser beam to form a latent image on a photoconductor surface,

an optical element controller programmed to send optical element position commands to compensate for inconsistent movements of said photoconductor surface;

a recorder programmed to create a record of said optical element position commands; and

an analyzer programmed to analyze said record to detect an issue, wherein analyzing said record to detect an issue is performed in real time.

9. The system of claim 8, wherein said analyzer is programmed to identify a component of said digital printer that is likely contributing to said inconsistency in said movement of said photoconductor surface.

10. The system of claim 8, further comprising a user interface that displays at least one parameter of said record.

11. The system of claim 8, further comprising a position sensor programmed to output an angular position of said photoconductor drum to said optical element controller.

12. A digital printer, comprising:

a marking engine comprising a photoconductor for receiving a latent image;

an optical element positioned to direct a laser beam towards a surface of said photoconductor,

an optical element controller programmed to send optical element position commands to move said optical element, wherein said optical element controller adjusts for variations in a velocity of said photoconductor;

a recorder programmed to create a record of said optical element position commands; and

an analyzer programmed to analyze said record to detect an issue, wherein analyzing said record to detect an issue is performed in real time.

13. The printer of claim 12, further comprising a user interface that displays said record.

14. The printer of claim 12, further comprising a user interface that displays at least one parameter of said record.

15. The printer of claim 12, wherein said photoconductor comprises a photoconductor drum that rotates with an angular velocity, said printer further comprising a position sensor programmed to output an angular position of said photoconductor drum to said optical element controller.

16. The printer of claim 12, wherein said analyzer is programmed to provide an indication of which part in said printer is likely contributing to variation in a rotational speed of said photoconductor.