Image forming apparatus

• US 10,451,991 B2
• Filed: 05/27/2016
• Issued: 10/22/2019
• Est. Priority Date: 05/27/2015
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Nagata, Teppei, Kabashima, Toru
• Primary Examiner(s): Therrien, Carla J
• Application Number:
  US15/556,348
• Publication Number:
  US 20180107130A1
• Time in Patent Office: 1,243 Days
• CPC Class Codes: G03G 15/104 Preparing, mixing, transporting or dispensing developer
• CPC Class Codes: G03G 15/105 Detection or control means for the toner concentration
• CPC Class Codes: G03G 21/10 Collecting or recycling waste developer
• CPC Class Codes: G03G 9/125 characterised by the liquid

Abstract

An image forming apparatus includes an image forming portion configured to form an image with a liquid developer containing a toner and a carrier liquid, a separating device configured to separate the toner and the carrier liquid from the liquid developer collected at the image forming portion, a first carrier supplying device supplies a first carrier liquid separated by the separating device, and a second carrier supplying device including a second carrier container to accommodate a second carrier liquid in which a ratio of the first substance to the second substance is smaller than that in the first carrier liquid separated by the separating device or no first substance is contained. An accommodating portion accommodates the liquid developer including the first carrier liquid, the second carrier liquid, and the toner, wherein the liquid developer accommodated in the accommodating portion is supplied to the image forming portion.

Claims

1. An image forming apparatus comprising:

an image forming portion configured to form an image with a liquid developer containing a toner and a carrier liquid,

wherein said image forming portion includes a photosensitive member on which a latent image is to be formed, a developing device configured to develop the latent image formed on said photosensitive member into a toner image with the liquid developer, a transfer device configured to transfer the toner image from said photosensitive member onto a recording material, and a cleaning device configured to remove the liquid developer on said photosensitive member after transferring the toner image from said photosensitive member onto the recording material;

a separating device configured to separate the toner and the carrier liquid from the liquid developer collected at said cleaning device;

a first carrier supplying device including a first carrier container configured to accommodate a first carrier liquid separated by said separating device, wherein said first carrier supplying device is capable of supplying the first carrier liquid from said first carrier container;

a second carrier supplying device including a second carrier container configured to accommodate a second carrier liquid which is higher in volume resistivity than the first carrier liquid in said first carrier container, wherein said second carrier supplying device is capable of supplying the second carrier liquid from said second carrier container;

a third carrier supplying device including a third carrier container configured to accommodate a third carrier liquid which is higher in volume resistivity than the first carrier liquid separated by said separating device and which is lower in volume resistivity than the second carrier liquid accommodated in said second carrier container, wherein said third carrier supplying device is capable of supplying the third carrier liquid from said third carrier container;

a liquid amount detecting device configured to detect an amount of the first carrier liquid in said first carrier container; and

a resistance detecting device configured to detect a volume resistivity of a liquid in said first carrier container,

a toner container configured to accommodate a toner; and

an accommodating portion configured to accommodate the liquid developer including the first carrier liquid supplied from said first carrier supplying device, the second carrier liquid supplied from said second carrier supplying device, and the toner supplied from said toner container, wherein the liquid developer accommodated in said accommodating portion is capable of being supplied to said image forming portion,

wherein each of said second carrier supplying device and said third carrier supplying device is capable of supplying the carrier liquid to said first carrier container,

wherein said second carrier supplying device is capable of supplying the second carrier liquid from said second carrier container to said first carrier container based on a detection result of said resistance detecting device, and

wherein said third carrier supplying device is capable of supplying the third carrier liquid from said third carrier container to said first carrier container based on a detection result of said liquid amount detecting device.

2. An image forming apparatus according to claim 1, further comprising:

a toner supplying device capable of supplying the toner to said accommodating portion; and

a mixing device configured to mix and disperse the toner, the first carrier liquid, and the second carrier liquid in said accommodating portion.

3. An image forming apparatus according to claim 2, further comprising:

a plurality of toner containers provided correspondingly to a plurality of colors; and

a plurality of accommodating portions, provided correspondingly to said plurality of toner containers, to which toner is to be supplied from said plurality of toner containers,

wherein said first carrier supplying device is capable of supplying the first carrier liquid to said plurality of accommodating portions.

4. An image forming apparatus according to claim 2, further comprising a content detecting device configured to detect information on a toner content in said accommodating portion,

wherein said first carrier supplying device supplies the first carrier liquid to said accommodating portion based on a detection result of said content detecting device.

5. An image forming apparatus according to claim 2, further comprising:

a plurality of toner containers provided correspondingly to a plurality of colors; and

a plurality of accommodating portions, provided correspondingly to said plurality of toner containers, to which toner is to be supplied from said plurality of toner containers,

wherein said second carrier supplying device is capable of supplying the second carrier liquid from said second container to said plurality of accommodating portions.

6. An image forming apparatus according to claim 1, further comprising a second resistance detecting device configured to detect a volume resistivity of a liquid in said accommodating portion,

wherein said second carrier supplying device is capable of supplying the second carrier liquid from said second container to said accommodating portion and supplies the second carrier liquid to said accommodating portion based on a detection result of said second resistance detecting device.

7. An image forming apparatus according to claim 1, wherein the second substance is a curable liquid which is curable by light irradiation.

8. An image forming apparatus according to claim 1, further comprising a fixing device configured to fix the toner image on the recording material by irradiating the toner image, transferred on the recording material, with light to cure the carrier liquid transferred on the recording material.

9. An image forming apparatus according to claim 1,

wherein said second carrier supplying device is capable of supplying the second carrier liquid to said first carrier container.

10. An image forming apparatus according to claim 9, wherein said first carrier supplying device is capable of supplying the first carrier liquid in said first carrier container to said accommodating portion.

11. An image forming apparatus according to claim 1, wherein said first carrier supplying device and said second carrier supplying device independently supply the first and second carrier liquids, respectively, to said accommodating portion.

12. An image forming apparatus according to claim 1, wherein the liquid developer accommodated in said accommodating portion is capable of being supplied to said developing device configured to develop the latent image formed on said photosensitive member.

13. An image forming apparatus according to claim 1, wherein the first carrier contains a charge control agent.

14. An image forming apparatus comprising:

an image forming portion configured to form an image with a liquid developer containing a toner and a carrier liquid;

a separating device configured to separate the toner and the carrier liquid from the liquid developer collected at said image forming portion;

a container configured to accommodate the carrier liquid separated by said separating device;

a resistance detecting unit configured to detect volume resistivity of the carrier liquid in said container containing the separated carrier liquid;

a mixing unit configured to mix a carrier liquid for supply higher in volume resistivity than the carrier liquid in said container with the separated carrier liquid; and

a control unit configured to control said mixing unit based on the volume resistivity of the carrier liquid in said container, detected by said resistance detecting unit.

15. An image forming apparatus according to claim 14, wherein said control unit controls said mixing unit so as to mix the carrier liquid in said container and the carrier liquid for supply in a case where the volume resistivity of the carrier liquid in said container, detected by said resistance detecting unit, is less than a predetermined value.

16. An image forming apparatus according to claim 14, further comprising a liquid amount detecting unit configured to detect an amount of the carrier liquid in said container,

wherein said control unit controls said mixing unit based on the volume resistivity of the carrier liquid in said container, detected by said resistance detecting unit, and the amount of the carrier liquid in said container, detected by said liquid amount detecting unit.

17. An image forming apparatus according to claim 16, wherein said control unit controls said mixing unit so as to mix the carrier liquid in said container and the carrier liquid for supply in a case where the volume resistivity of the carrier liquid in said container, detected by said resistance detecting unit, is less than a predetermined value,

wherein said control unit controls said mixing unit so as to mix the carrier liquid in said container and the carrier liquid for supply in a case where the volume resistivity of the carrier liquid in said container, detected by said resistance detecting unit, is the predetermined value or more and where the amount of the carrier liquid in said container, detected by said liquid amount detecting unit, is a predetermined amount or less.

18. An image forming apparatus according to claim 14, wherein the volume resistivity of the carrier liquid for supply is higher than volume resistivity of the carrier liquid used at said image forming portion.

19. An image forming apparatus according to claim 14, wherein the liquid developer is an ultraviolet-curable liquid developer curable by ultraviolet radiation.