Vacuum transport having jetting area allowing periodic jetting of all nozzles

Patent metadata

Field	Value
Publication number	US-10926557-B2
Application number	US-201916352992-A
Country	US
Kind code	B2
Filing date	Mar 14, 2019
Priority date	Mar 14, 2019
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

Devices include an inkjet printhead having nozzles and a transport item adjacent the nozzles. The transport item includes vacuum openings adapted to maintain print media on the transport item. The transport item moves the print media in a processing direction. The transport item also includes a jetting area lacking the vacuum openings. The jetting area is elongated and is oriented perpendicular to the processing direction. The nozzles are controlled to eject ink to the jetting area when the nozzles are aligned with the jetting area.

First claim

What is claimed is:

1. A device comprising:
an inkjet printhead having nozzles; and
a transport item adjacent the nozzles,
wherein the transport item comprises:
vacuum openings adapted to maintain print media on the transport item, wherein the transport item moves the print media in a processing direction; and
a jetting area lacking the vacuum openings, wherein the jetting area is a top of the transport item and is oriented perpendicular to the processing direction, and

wherein the nozzles are controlled to eject ink to the jetting area of the top of the transport item when the nozzles are aligned with the jetting area, and
wherein the transport item comprises a belt having a single seam where the two ends of the belt are joined to create a continuous loop of belt material, and wherein the seam is oriented perpendicular to the processing direction, and wherein the jetting area is located at the seam.

2. The device according to claim 1 , further comprising an optical sensor adapted to detect positions of sheets of the print media relative to the jetting area, wherein the inkjet printhead is controlled to avoid ejecting the ink on the sheets that cover the seam.

3. The device according to claim 1 , wherein the transport item comprises inter-document zones between where sheets of the print media are located on the transport item, and wherein the jetting area is located within at least one of the inter-document zones.

4. The device according to claim 1 , wherein a size of the jetting area allows multiple ones of the nozzles to simultaneously eject the ink to the jetting area.

5. The device according to claim 1 , further comprising a controller electrically connected to the inkjet printhead and the transport item,
wherein the controller is adapted to control the nozzles to eject the ink to the jetting area only from nozzles that have not ejected the ink for more than a time limit.

6. The device according to claim 5 , wherein the time limit is different for different color inks.

7. A device comprising:
an inkjet printhead having nozzles;
a transport item adjacent the nozzles; and
a cleaning station contacting the transport item,
wherein the transport item comprises:
vacuum openings adapted to maintain print media on the transport item, wherein the transport item moves the print media in a processing direction; and
a jetting area lacking the vacuum openings, wherein the jetting area is a top of the transport item and is oriented perpendicular to the processing direction,

wherein unused ones of the nozzles are controlled to eject ink to the jetting area of the top of the transport item when the nozzles are aligned with the jetting area, and
wherein the cleaning station is adapted to remove the ink from the jetting area, and
wherein the transport item comprises a belt having a single seam where the two ends of the belt are joined to create a continuous loop of belt material, and wherein the seam is oriented perpendicular to the processing direction, and wherein the jetting area is located at the seam.

8. The device according to claim 7 , further comprising an optical sensor adapted to detect positions of sheets of the print media relative to the jetting area, wherein the inkjet printhead is controlled to avoid ejecting the ink on the sheets that cover the seam.

9. The device according to claim 7 , wherein the transport item comprises inter-document zones between where sheets of the print media are located on the transport item, and wherein the jetting area is located within at least one of the inter-document zones.

10. The device according to claim 7 , wherein a size of the jetting area allows multiple ones of the nozzles to simultaneously eject the ink to the jetting area.

11. The device according to claim 7 , further comprising a controller electrically connected to the inkjet printhead and the transport item,
wherein the controller is adapted to control the nozzles to eject the ink to the jetting area only from nozzles that have not ejected the ink for more than a time limit.

12. The device according to claim 11 , wherein the time limit is different for different color inks.

13. A method comprising:
moving, as controlled by a controller, a transport item in a process direction to transport print media in the process direction past an inkjet printhead, wherein the inkjet printhead has nozzles, wherein the transport item comprises: vacuum openings adapted to maintain print media on the transport item; and a jetting area lacking the vacuum openings, and wherein the jetting area is a top of the transport item and is oriented perpendicular to the processing direction, and wherein the transport item comprises a belt having a single seam where the two ends of the belt are joined to create a continuous loop of belt material, and wherein the seam is oriented perpendicular to the processing direction, and wherein the jetting area is located at the seam; and
controlling, by the controller, the nozzles to eject ink to the jetting area of the top of the transport item when the nozzles are aligned with the jetting area.

14. The method according to claim 13 , wherein the controlling the nozzles to eject the ink comprises:
detecting printing on sheets of the print media;
identify nozzles that are not ejecting properly; and
ejecting the ink from the nozzles that are not ejecting properly on the jetting area.

15. The method according to claim 14 , wherein the controlling the nozzles to eject the ink comprises:
detecting positions of sheets of the print media relative to the jetting area using an optical sensor; and
avoiding ejecting the ink on the sheets that cover the jetting area.

16. The method according to claim 13 , wherein the transport item comprises inter-document zones between where sheets of the print media are located on the transport item, and wherein the jetting area is located within at least one of the inter-document zones.

17. The method according to claim 13 , wherein the controlling the nozzles to eject the ink comprises simultaneously ejecting the ink to the jetting area from multiple ones of the nozzles.

18. The method according to claim 13 , wherein the controlling the nozzles comprises controlling the nozzles to eject the ink to the jetting area only from nozzles that have not ejected the ink for more than a time limit.

Assignees

• Xerox Corp

Inventors

• Mclaughlin Matthew R
• Tamarez Gomez Frank B
• Tanchak Rachel L
• Fromm Paul M

Classifications

• B41J2002/1657

  Cleaning of only nozzles or print head parts being selected · CPC title

• B41J2/16526

  by applying pressure only · CPC title

• B41J11/0085 Primary

  Using suction for maintaining printing material flat (on rotatable drums B41J13/226) · CPC title

• B41J2002/16591

  for line print heads above an endless belt · CPC title

• B41J2/16585

  for paper-width or non-reciprocating print heads · CPC title