Image forming apparatus with cleaning blade and enhanced lubrication operation

• US 5,915,156 A
• Filed: 12/16/1997
• Issued: 06/22/1999
• Est. Priority Date: 12/16/1996
• Status: Expired due to Fees

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Kizaki, Osamu, Sanpe, Atsushi
• Primary Examiner(s): LEE, SUSAN SHUK YIN
• Application Number:
  US08/991,859
• Time in Patent Office: 553 Days
• Field of Search: 399/346, 399/71, 399/350
• US Class Current: 399/346
• CPC Class Codes: G03G 21/0005 for removing solid developer or debris from the electrographic recording medium
• CPC Class Codes: G03G 21/0029 Details relating to the blade support

Abstract

A contact time with an image carrier and a cleaning blade is added up, and a toner image pattern is formed according to such an added up value. Accordingly, the quantity of toner as a lubricant sticking based on a toner image pattern becomes a most suitable quantity. As the added up value increases when it is described concretely, an area of the toner image pattern is made small, and accordingly a quantity of adhesion of toner is reduced. Accordingly, when a frictional resistance between an image carrier and a cleaning blade becomes low, or when an image carrier deteriorates, a quantity of supply of toner is controlled to be a proper amount

Claims

1. An image forming apparatus having an image carrier, comprising:

a cleaning blade contacting said image carrier for removing residual toner from said image carrier;

a lubricant supplying means for supplying lubricant to a contact portion composed of said cleaning blade and said image carrier in order to decrease a coefficient of friction between said cleaning blade and said image carrier;

a calculating means for adding up a moving time of said image carrier; and

a control means for regulating a supplying quantity of said lubricant by the lubricant supplying means based on a result of a sum of the moving time added up by said calculating means.

2. An image forming apparatus having an image carrier comprising:

a cleaning blade contacting said image carrier for removing residual toner from said image carrier;

a lubricant supplying means for supplying lubricant to a contact portion composed of said cleaning blade and said image carrier in order to decrease a coefficient of friction between said cleaning blade and said image carrier;

a calculating means for adding up a driving condition of said image carrier; and

a control means for regulating a supplying quantity of said lubricant by the lubricant supplying means based on a result of a sum added up by said calculating means, wherein said control means regulates the supplying quantity of lubricant to be zero when the sum exceeds a predetermined value.

3. An image forming apparatus having a image carrier, comprising:

a cleaning blade contacting said image carrier for removing residual toner from said image carrier;

a lubricant supplying means for supplying lubricant to a contact portion composed of said cleaning blade and said image carrier in order to decrease a coefficient of friction between said cleaning blade and said image carrier;

a calculating means for adding up a driving condition of said image carrier; and

a control means for regulating a supplying quantity of said lubricant by the lubricant supplying means based on a result of a sum added up by said calculating means,

wherein said lubricant supplying means has an image pattern forming means for forming an image pattern for supplying lubricant to said contact portion on said image carrier, and said control means changes a forming condition of said image pattern based on the sum added up by said calculating means.

4. A image forming apparatus in accordance with claim 3, wherein said lubricant is toner used for development.

5. An image forming apparatus in accordance with claim 4, further comprising:

an image pattern forming means for forming an image pattern for toner concentration, and wherein said image pattern for toner as lubricant is formed in synchronization with the formation of said image pattern for toner concentration.

6. An image forming apparatus having an image carrier, comprising:

a cleaning blade contacting said image carrier for removing residual toner from said image carrier;

a lubricant supplying means for supplying lubricant to a contact portion composed of said cleaning blade and said image carrier in order to decrease a coefficient of friction between said cleaning blade and said image carrier;

a calculating means for adding up a driving condition of said image carrier;

a control means for regulating a supplying quantity of said lubricant by the lubricant supplying means based on a result of a sum added up by said calculating means; and

a blade moving means for moving said cleaning blade at a location away from said image carrier, and wherein said calculating means adds up the driving condition of said image carrier only when said cleaning blade is in contact with said image carrier.

7. An image forming apparatus having an image carrier, comprising:

a cleaning blade contacting said image carrier for removing residual toner from said image carrier;

a lubricant tank for supplying lubricant to a contact portion composed of said cleaning blade and said image carrier in order to decrease a coefficient of friction between said cleaning blade and said image carrier;

a calculating circuit for adding up a moving time of said image carrier; and

a controller for regulating a supplying quantity of said lubricant by the lubricant tank based on a result of a sum of the moving time added up by said calculating circuit.

8. An image forming apparatus having an image carrier, comprising:

a cleaning blade contacting said image carrier for removing residual toner from said image carrier;

a lubricant tank for supplying lubricant to a contact portion composed of said cleaning blade and said image carrier in order to decrease a coefficient of friction between said cleaning blade and said image carrier;

a calculating circuit for adding up a driving condition of said image carrier; and

a controller for regulating a supplying quantity of said lubricant by the lubricant tank based on a result of a sum added up by said calculating circuit, wherein said controller regulates the supplying quantity of lubricant to be zero when the sum exceeds a predetermined value.

9. An image forming apparatus having an image carrier comprising:

a cleaning blade contacting said image carrier for removing residual toner from said image carrier;

a lubricant tank for supplying lubricant to a contact portion composed of said cleaning blade and said image carrier in order to decrease a coefficient of friction between said cleaning blade and said image carrier;

a calculating circuit for adding up a driving condition of said image carrier;

a controller for regulating a supplying quantity of said lubricant by the lubricant tank based on a result of a sum added up by said calculating circuit; and

a discharge lamp for forming an image pattern for supplying the lubricant to said contact portion on said image carrier, and said controller changes a forming condition of said image pattern based on the sum added up by said calculating circuit.

10. A image forming apparatus in accordance with claim 9, wherein said lubricant is toner used for development.

11. An image forming apparatus in accordance with claim 10,

wherein the discharge lamp further forms an image pattern for toner concentration, and wherein said image pattern for supplying the lubricant is formed in synchronization with the formation of said image pattern for toner concentration.

12. An image forming apparatus having an image carrier, comprising:

a cleaning blade contacting said image carrier for removing residual toner from said image carrier;

a lubricant tank for supplying lubricant to a contact portion composed of said cleaning blade and said image carrier in order to decrease a coefficient of friction between said cleaning blade and said image carrier;

a calculating circuit for adding up a driving condition of said image carrier;

a controller for regulating a supplying quantity of said lubricant by the lubricant tank based on a result of a sum added up by said calculating circuit; and

an actuator for moving said cleaning blade at a location away from said image carrier, wherein said calculating circuit adds up a driving condition of said image carrier only when said cleaning blade is in contact with said image carrier.