Electrophotographic image forming device with augers for transferring toner

• US 5,742,882 A
• Filed: 07/26/1996
• Issued: 04/21/1998
• Est. Priority Date: 07/29/1995
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Man-Woo
• Primary Examiner(s): Royer, William J.
• Application Number:
  US08/686,963
• Time in Patent Office: 634 Days
• Field of Search: 399/254, 399/255, 399/258, 399/260, 399/262, 399/263, 399/358, 399/359
• US Class Current: 399/258
• CPC Class Codes: G03G 15/0822 Arrangements for preparing, mixing, supplying or dispensing developer
• CPC Class Codes: G03G 15/0855 the concentration being measured by optical means
• CPC Class Codes: G03G 15/0865 Arrangements for supplying new developer
• CPC Class Codes: G03G 15/0872 the developer cartridges being generally horizontally mounted parallel to its longitudinal rotational axis
• CPC Class Codes: G03G 15/0877 Arrangements for metering and dispensing developer from a developer cartridge into the development unit
• CPC Class Codes: G03G 15/0896 Arrangements or disposition of the complete developer unit or parts thereof not provided for by groups G03G15/08 - G03G15/0894
• CPC Class Codes: G03G 21/105 Arrangements for conveying toner waste

Abstract

An electrophotographic image forming device includes a toner container installed inside a photoconductive drum to provide toner to a developing unit. Toner that is removed and collected by a cleaning unit can be reused, thus reducing toner cost. Also, since the toner container is installed inside the photoconductive drum, the image forming device can be made compact, and an installation space is not restricted when the developing unit is installed within the image forming device. Further, since the used toner is re-used, the interior portions of the image forming device are not contaminated.

Claims

1. An electrophotographic image forming device, comprising:

a photoconductive drum;

a charging unit for electrically charging an outer surface of said photoconductive drum;

an exposing unit for forming an electrostatic latent image on the outer surface of said photoconductive drum;

a developing unit for providing toner to the outer surface of said photoconductive drum to form a toner image;

a copying roller for copying the toner image from the outer surface of said photoconductive drum to a recording sheet;

a toner container installed within said photoconductive drum for storing the toner, said toner container having a first hole formed in a lower portion thereof,

a cleaning unit for removing and collecting the toner remaining on the outer surface of said photoconductive drum after an image forming operation is performed, said cleaning unit having a second hole formed in a lower portion thereof;

a first auger installed within said toner container for transferring the toner in a first direction;

a first driving gear installed at an end of said first auger for rotating said first auger;

a second auger installed below said first hole for receiving the toner from said toner container via said first auger, and transferring the toner to said developing unit;

a third auger installed within an interior of said developing unit for transferring the toner received from said second auger to a supply roller of said developing unit;

a second driving gear installed at an end of said third auger for rotating said third auger;

a fourth auger installed within said cleaning unit for transferring the toner in said first direction;

a third driving gear installed at an end of said fourth auger for rotating said fourth auger; and

a fifth auger installed below said second hole for receiving the toner from said cleaning unit via said fourth auger, and transferring the toner to said second auger, said second auger transferring the toner received via said fifth auger to said developing unit.

2. An electrophotographic image forming device as claimed in claim 1, wherein said second auger is slanted to supply the toner to said developing unit.

3. An electrophotographic image forming device as claimed in claim 1, wherein said first, second and third driving gears operate together to maintain a uniform supply of the toner.

4. An electrophotographic image forming device as claimed in claim 1, further comprising a wing formed on one side of said first auger for preventing accumulation and hardening of the toner within said toner container by rotation of said first auger.

5. An electrophotographic image forming device as claimed in claim 1, further comprising a wing formed on one side of said fourth auger for preventing accumulation and hardening of the toner within said cleaning unit by rotation of said fourth auger.

6. An electrophotographic image forming device as claimed in claim 1, wherein an amount of the toner stored in said toner container corresponds to a life of said photoconductive drum so that the toner within said toner container is depleted when said photoconductive drum is to be replaced.

7. An electrophotographic image forming device as claimed in claim 1, wherein the toner collected by said cleaning unit is combined together with new toner in said developing unit.

8. An electrophotographic image forming device, comprising:

a photoconductive drum;

a toner container installed within said photoconductive drum for storing toner, said toner container having a first hole formed in a lower portion thereof;

a developing unit for providing the toner to an outer surface of said photoconductive drum to form a toner image;

a cleaning unit for removing and collecting the toner remaining on the outer surface of said photoconductive drum after an image forming operation is performed, said cleaning unit having a second hole formed in a lower portion thereof;

a first auger installed within said toner container for transferring the toner in a first direction;

a second auger installed below said first hole for receiving the toner from said toner container via said first auger, and transferring the toner to said developing unit;

a third auger installed within an interior of said developing unit for transferring the toner received from said second auger to a supply roller of said developing unit;

a fourth auger installed within said cleaning unit for transferring the toner in said first direction; and

a fifth auger installed below said second hole for receiving the toner from said cleaning unit via said fourth auger, and transferring the toner to said second auger, said second auger transferring the toner received via said fifth auger to said developing unit.

9. An electrophotographic image forming device as claimed in claim 8, wherein said second auger is slanted to supply the toner to said developing unit.

10. An electrophotographic image forming device as claimed in claim 9, wherein an amount of the toner stored in said toner container corresponds to a life of said photoconductive drum so that the toner within said toner container is depleted when said photoconductive drum is to be replaced.

11. An electrophotographic image forming device as claimed in claim 10, wherein the toner collected by said cleaning unit is combined together with new toner in said developing unit.

12. An electrophotographic image forming device as claimed in claim 8, wherein an amount of the toner stored in said toner container corresponds to a life of said photoconductive drum so that the toner within said toner container is depleted when said photoconductive drum is to be replaced.

13. An electrophotographic image forming device as claimed in claim 8, wherein the toner collected by said cleaning unit is combined together with new toner in said developing unit.

14. A method for transferring toner in an electrophotographic image forming device, comprising the steps of:

rotating a first auger to output toner from a toner container positioned within a photoconductive member of said device;

rotating a second auger to transfer the toner output from said tone container to a developing unit of said device;

rotating a third auger to enable transfer of the toner from said developing unit to said photoconductive member to perform an image forming operation;

collecting the toner remaining on said photoconductive member within a cleaning unit after said image forming operation is performed;

rotating a fourth auger to output the toner from said cleaning unit;

rotating a fifth auger to transfer the toner output from said cleaning unit to said second auger; and

rotating said second auger to transfer the toner received via rotation of said fifth auger to said developing unit.