Printer having a separated printhead array

Patent metadata

Field	Value
Publication number	US-10786943-B2
Application number	US-201816217502-A
Country	US
Kind code	B2
Filing date	Dec 12, 2018
Priority date	Jun 28, 2016
Publication date	Sep 29, 2020
Grant date	Sep 29, 2020

Abstract

A printer is configured with at least two printheads that are separated from one another in a cross-process direction by an integral multiple of printhead widths. This configuration enables parallel swaths of material to be ejected and then movement of the printheads in the cross-process direction by a distance corresponding to one or more integral numbers of the printhead width enables the area between the swaths to be completed and the area outside of the original swaths printed.

First claim

What is claimed is:

1. A printer comprising:
a member having a surface;
at least two printheads, each printhead having an array of ejectors configured to eject drops of material toward the surface of the member, the printheads in the at least two printheads being mounted in tandem with one another and each of the printheads in the at least two printheads being separated in a cross-process direction from a closest printhead in the at least two printheads by a distance corresponding to an integral number of widths of one of the printheads;
a first roller having at least two portions with a diameter that is greater than one or more portions of the first roller separating the portions having the greater diameter, the portions having the greater diameter being separated by the distance corresponding to the integral number of widths of one of the printheads;
at least one actuator operatively connected to the member or the at least two printheads and operatively connected to the first roller; and
a controller operatively connected to the at least two printheads and the at least one actuator, the controller being configured to:
operate the at least one actuator to move the member or the at least two printheads in a process direction while operating the ejectors in the at least two printheads to eject drops of material from the at least two printheads and form a swath with each of the printheads in the at least two printheads with the swaths being separated by the distance corresponding to the integral number of widths of one of the printheads;
operate the at least one actuator to move the member or the at least two printheads in the cross-process direction by a distance corresponding to one or more integral number of widths of one of the printheads so no ejector in any of the at least two printheads can eject drops of material adjacent to drops of material previously ejected by that ejector; and
operate the at least one actuator to move the member or the firsts roller in the process direction at a predetermined distance from the drops of material ejected from the at least two printheads while operating the at least one actuator to rotate the first roller to remove a portion of the drops of material ejected from the at least two printheads.

2. The printer of claim 1 wherein the printheads in the at least two printheads are separated by a distance corresponding to a width of a single printhead.

3. The printer of claim 1 wherein the printheads in the at least two printheads are separated by a distance corresponding to a width of two printheads.

4. The printer of claim 1 , the controller is further configured to:
operate the at least one actuator to move the at least two printheads in the process direction after the member or the at least two printheads have been moved in the cross-process direction while operating the at least two printheads to eject drops of material from the at least two printheads and form another swath with each of the printheads in the at least two printheads with the other swaths being separated by the distance corresponding to the integral number of widths of one of the printheads.

5. The printer of claim 1 further comprising:
at least two curing devices separated by the distance corresponding to the integral number of widths of one of the printheads; and
the controller operatively connected to the at least two curing devices, the controller being configured to:
operate the at least one actuator to move the member or the at least two curing devices in the process direction while operating the at least two curing devices to expose the drops of material ejected from the at least two printheads.

6. The printer of claim 1 further comprising:
at least one other roller separated from the first roller by the distance corresponding to the integral number of widths of one of the printheads; and
the controller being further configured to:
operate the at least one actuator to move the member or the first roller and the at least one other roller in the process direction at a predetermined distance from the drops of material ejected from the at least two printheads while operating the at least one actuator to rotate the first roller and the at least one other roller to remove a portion of the drops of material ejected from the at least two printheads.

7. The printer of claim 1 , the controller being further configured to:
operate the at least one actuator to move the member or the at least two printheads in the cross-process direction to enable the at least two printheads to eject drops of material within a swath previously formed by the at least two printheads.

8. The printer of claim 1 , the controller being further configured to:
operate the at least one actuator to move the member or the at least two printheads in the cross-process direction by a distance that enables the at least two printheads to form a swath over swaths previously formed by the at least two printheads with edges of the swaths being formed not being aligned with edges of the swaths previously formed by the at least two printheads.

9. The printer of claim 8 , the controller being further configured to:
operate the at least one actuator to move the member or the at least two printheads in the cross-process direction by a distance that corresponds to a width of a single drop of material ejected from the ejectors in the at least two printheads.

10. The printer of claim 1 , the at least two printheads further comprising:
a first array of printheads arranged in a row aligned with the process direction; and
a second array of printheads arranged in a row aligned with the process direction, the first array of printheads and the second array of printheads being mounted in tandem with one another and each of the printheads in the first array of printheads being separated in a cross-process direction from a closest printhead in the second array of printheads by a distance corresponding to an integral number of widths of one of the printheads.

11. The printer of claim 10 wherein a number of printheads in the first array of printheads is equal to a number of printheads in the second array of printheads.

12. The printer of claim 11 wherein the distance corresponding to the integral number of widths of one of the printheads is in a range of about 95% to about 105% of the width of the one printhead.

Assignees

• Xerox Corp

Inventors

• Mandel Barry P
• Giacobbi James L
• Mcconville Paul J
• Mantell David A
• Spence James J
• Calamita James P

Classifications

• B41J2/51

  serial printer type · CPC title

• B29C64/112 Primary

  using individual droplets, e.g. from jetting heads · CPC title

• B29C64/209

  Heads; Nozzles · CPC title

• B33Y30/00

  Apparatus for additive manufacturing; Details thereof or accessories therefor · CPC title

• B29C64/20

  Apparatus for additive manufacturing; Details thereof or accessories therefor · CPC title