Transfer of ink layers

Patent metadata

Field	Value
Publication number	US-9383687-B2
Application number	US-201114362872-A
Country	US
Kind code	B2
Filing date	Dec 21, 2011
Priority date	Dec 21, 2011
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

An image forming apparatus includes a photoconductive member to move in a rotational direction, a charging unit to charge the photoconductive member, a discharging unit to discharge a portion of the photoconductive member to form a latent image thereon, and a plurality of ink applicator units to sequentially apply a plurality of ink layers, respectively, toward the latent image to form an ink image. The image forming apparatus may also include an image transfer blanket to receive the ink image including the plurality of ink layers from the photoconductive member.

First claim

What is claimed is:

1. An image forming apparatus, comprising:
a photoconductive member to move in a rotational direction;
a single charging unit to charge the photoconductive member;
a discharging unit to discharge a portion of the photoconductive member to form a latent image on the photoconductive member;
a plurality of ink applicator units disposed across from the photoconductive member and spaced apart from each other in the rotational direction, the ink applicator units to, in a print cycle corresponding to one rotation of the photoconductive member, sequentially apply a plurality of ink layers, respectively, toward the latent image to form an ink image such that each one of the ink layers is in contact with another one of the ink layers, wherein at least one of the plurality of ink applicator units is other than a developer unit, wherein the sequentially applying the plurality of ink layers in the print cycle is performed with just a single charging of the photoconductive member in the print cycle by the charging unit and a single discharging of the photoconductive member in the print cycle by the discharging unit; and
an intermediate transfer member having an image transfer blanket to receive the ink image including the plurality of ink layers from the photoconductive member.

2. The image forming apparatus according to claim 1 , wherein the plurality of ink applicator units comprise:
a first ink applicator unit to apply a first ink layer toward the latent image; and
a second ink applicator unit disposed downstream from the first ink applicator unit in the rotational direction, the second ink applicator unit to apply a second ink layer toward the latent image and on top of the first ink layer.

3. The image forming apparatus according to claim 2 , wherein the first ink layer includes a primer layer, and the second ink layer includes a colored-ink layer.

4. The image forming apparatus according to claim 3 , wherein each ink layer of the plurality of ink layers includes charge directors.

5. The image forming apparatus of claim 1 , wherein the plurality of ink applicator units comprise an inkjet printhead.

6. A method of operating an image forming apparatus, the method comprising:
in a print cycle corresponding to one rotation of a photoconductive member in the image forming apparatus:
charging the photoconductive member by a single charging unit;
discharging a portion of the photoconductive member by a single discharging unit to form a latent image on the photoconductive member;
following the discharging by the single discharging unit, sequentially applying a plurality of ink layers from a plurality of ink applicator units, respectively, toward the latent image to form an ink image such that each one of the ink layers is in contact with another one of the ink layers, wherein at least one of the plurality of ink applicator units is other than a developer unit; and
transferring the ink image formed by the plurality of ink layers from the photoconductive member to an image transfer blanket.

7. The method according to claim 6 , wherein each ink layer of the plurality of ink layers comprises charge directors.

8. The method according to claim 6 , wherein the sequentially applying the plurality of ink layers from the plurality of ink applicator units, respectively, toward the latent image to form the ink image comprises:
applying a first ink layer from a first ink applicator unit toward the latent image; and
applying a second ink layer from a second ink applicator unit toward the latent image and on top of the first ink layer.

9. The method according to claim 8 , wherein the first ink layer comprises a primer layer, and the second ink layer comprises a colored-ink layer having a color.

10. The method according to claim 9 , wherein the sequentially applying the plurality of ink layers from the plurality of ink applicator units, respectively, toward the latent image to form the ink image further comprises:
applying a third ink layer from a third ink applicator unit toward the latent image and over the second ink layer, the third ink layer comprising an ink coating layer.

11. The method according to claim 6 , further comprising:
transferring the ink image from the image transfer blanket to a media.

12. The method of claim 6 , wherein the plurality of ink applicator units comprise an inkjet printhead.

13. An image forming method, comprising:
rotating a photoconductive member in a rotational direction in a print cycle corresponding to one rotation of the photoconductor member;
in the print cycle:
activating a single charging unit to charge the photoconductive member;
activating a discharging unit to discharge the photoconductive member, the discharging of the photoconductive member forming a latent image on a portion of the photoconductive member;
applying a first ink layer from a first ink applicator unit to the latent image formed on the photoconductive member;
applying a second ink layer from a second ink applicator unit disposed downstream from the first ink applicator unit in the rotational direction on top of the first ink layer such that the first ink layer and the second ink layer form an ink image corresponding to the latent image, wherein the first ink layer and the second ink layer are applied with just a single charging of the photoconductive member by the charging unit and a single discharging of the photoconductive member by the discharging unit, wherein the applying the first ink layer and the applying the second ink layer are part of sequentially applying ink layers by a plurality of ink applicator units, wherein at least one of the plurality of ink applicator units is other than a developer unit; and
transferring the ink image from the photoconductive member to an image transfer blanket.

14. The image forming method according to claim 13 , wherein the first ink layer comprises a primer layer, and the second ink layer comprises a colored-ink layer having a color.

15. The image forming method according to claim 13 , further comprising:
in the print cycle, applying a third ink layer from a third ink applicator unit disposed downstream from the second ink applicator unit in the rotational direction on top of the second ink layer such that the first ink layer, the second ink layer, and the third ink layer form the ink image corresponding to the latent image.

16. The image forming method according to claim 13 , further comprising:
transferring the ink image from the image transfer blanket to a media.

17. The image forming method of claim 13 , wherein the second ink applicator unit comprises an inkjet printhead.

Assignees

• Nedelin Peter
• Sandler Mark
• Lior Shai
• Hewlett Packard Indigo Bv

Inventors

• Nedelin Peter
• Sandler Mark
• Lior Shai

Classifications

• G03G13/10

  using a liquid developer {, e.g. liquid suspension} · CPC title

• G03G15/0152 Primary

  onto which the monocolour toner images are superposed before common transfer from the recording member · CPC title

• G03G15/1605

  using at least one intermediate support (G03G15/1625 takes precedence) · CPC title

• G03G15/0168

  single rotation of recording member to produce multicoloured copy (G03G15/0163 takes precedence) · CPC title

• G03G15/10 Primary

  using a liquid developer · CPC title