Image forming apparatus that applies lubricant to a surface of image carrier

• US 6,768,879 B2
• Filed: 12/11/2002
• Issued: 07/27/2004
• Est. Priority Date: 12/11/2001
• Status: Active Grant

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Kosuge, Akio
• Primary Examiner(s): NGO, HOANG X
• Application Number:
  US10/316,156
• Publication Number:
  US 20040047642A1
• Time in Patent Office: 594 Days
• Field of Search: 399/38, 399/49, 399/60, 399/67, 399/71, 399/105, 399/114, 399/159, 399/252, 399/296, 399/343, 430/67, 430/105, 430/114
• US Class Current: 399/53
• CPC Class Codes: G03G 15/081 characterised by the developer handling means after the supply and before the regulating, e.g. means for preventing developer blocking

Abstract

An image forming apparatus includes an image carrier that rotates and carries an image on a surface of the image carrier, a latent image forming device that forms an electrostatic latent image on the image carrier, a developing device that develops the electrostatic latent image with a developer including a lubricant, and a transfer device that transfers the developed image to a transfer material. The image forming apparatus further includes a control device including a lubricant application executing device and controlling the lubricant application executing device to execute an application of the lubricant to the image carrier by actuating the developing device to apply the developer to the surface of the image carrier during one job of an image forming operation from a start of rotation of the image carrier to a stopping of the rotation of the image carrier.

Claims

1. An image forming apparatus, comprising:

an image carrier configured to rotate and carry an image on a surface of the image carrier;

a latent image forming device configured to form an electrostatic latent image on the image carrier;

a developing device configured to develop the electrostatic latent image with a developer including a lubricant;

a transfer device configured to transfer the image to a transfer material; and

a control device including a lubricant application executing device to at least control the lubricant application executing device to execute an application of the lubricant to the image carrier by actuating the developing device to apply the developer to the surface of the image carrier during one job of an image forming operation from a start of rotation of the image carrier to a stop of the image carrier,

wherein the control device further includes an image area calculating device configured to calculate an area of an image formed on the surface of the image carrier, and wherein the lubricant application executing device executes the application of the lubricant to the surface of the image carrier based at least in part on the calculated area of the image provided by the image area calculating device.

2. The image forming apparatus according to claim 1, further comprising a cleaning device including a cleaning blade to remove a residual developer remaining on the image carrier after the image is transferred to the transfer material.

3. The image forming apparatus according to claim 1, wherein the image carrier is formed from an organic photoreceptor, and wherein a surface of the organic photoreceptor comprises a protective layer including a filler.

4. The image forming apparatus according to claim 1, wherein the lubricant application executing device executes the application of the lubricant to the image carrier in a period in the one job after the electrostatic latent image formed for a last transfer material is developed by the developing device and before the stop of the image carrier.

5. The image forming apparatus according to claim 4, further comprising a discharging device configured to discharge the surface of the image carrier, wherein the lubricant application executing device executes the application of the lubricant to the image carrier by actuating the developing device to apply the developer to the discharged surface of the image carrier.

6. The image forming apparatus according to claim 1, wherein the lubricant application executing device executes the application of the lubricant to the image carrier in a period in the one job after the electrostatic latent image formed for a preceding transfer material is developed by the developing device and before the electrostatic latent image for a succeeding transfer material is developed by the developing device.

7. The image forming apparatus according to claim 6, further comprising a discharging device configured to discharge the surface of the image carrier, wherein the lubricant application executing device executes the application of the lubricant to the image carrier by actuating the developing device to apply the developer to a discharged area of the surface of the image carrier between the developed electrostatic latent image formed for the preceding transfer material and the electrostatic latent image formed for the succeeding transfer material on the surface of the image carrier.

8. The image forming apparatus according to claim 1, wherein the control device further includes an image writing pixel counting device configured to count a number of image writing pixels of the image formed on the surface of the image carrier, and wherein the writing pixel counting device provides the number of image writing pixels counted to the image area calculating device as an input used to calculate the area of the image formed on the surface of the image carrier.

9. The image forming apparatus according to claim 8, wherein the control device further includes an image area ratio calculating device configured to calculate a ratio of the image area calculated by the image area calculating device relative to a running distance of the image carrier, and wherein the lubricant application executing device executes the application of the lubricant to the surface of the image carrier based on the ratio of the image area calculated by the image area ratio calculating device.

10. The image forming apparatus according to claim 9, wherein the control device controls the lubricant application executing device to adjust an amount of the lubricant applied to the surface of the image carrier according to the ratio of the image area calculated by the image area ratio calculating device.

11. An image forming apparatus, comprising:

image carrying means for rotating and carrying an image on a surface of the image carrying means;

latent image forming means for forming an electrostatic latent image on the image carrying means;

developing means for developing the electrostatic latent image with a developer including a lubricant;

transferring means for transferring the image to a transfer material; and

control means including lubricant application executing means for executing an application of the lubricant to the image carrying means, the control means at least controlling the lubricant application executing means to execute an application of the lubricant to the image carrier by actuating the developing means to apply the developer to the surface of the image carrying means during one job of an image forming operation from a start of rotation of the image carrying means to a stop of the image carrying means,

wherein the control means further includes image area calculating means for calculating an area of an image formed on the surface of the image carrying means, and wherein the lubricant application executing means executes the application of the lubricant to the surface of the image carrying means based at least in part on the calculated area of the image provided by the image area calculating means.

12. The image forming apparatus according to claim 11, further comprising removing means for removing a residual developer remaining on the image carrying means alter the image is transferred to the transfer material.

13. The image forming apparatus according to claim 11, wherein the image carrying means is formed from an organic photoreceptor, and wherein a surface of the organic photoreceptor comprises a protective layer including a filler.

14. The image forming apparatus according to claim 11, wherein the lubricant application executing means executes the application of the lubricant to the image carrying means in a period in the one job after the electrostatic latent image formed for a last transfer material is developed by the developing means and before the stop of the image carrying means.

15. The image forming apparatus according to claim 14, further comprising discharging means for discharging the surface of the image carrying means, wherein the lubricant application executing means executes the application of the lubricant to the image carrying means by actuating the developing means to apply the developer to the discharged surface of the image carrying means.

16. The image forming apparatus according to claim 11, wherein the lubricant application executing means executes the application of the lubricant to the image carrying means in a period in the one job after the electrostatic latent image formed for a preceding transfer material is developed by the developing means and before the electrostatic latent image for a succeeding transfer material is developed by the developing means.

17. The image forming apparatus according to claim 16, further comprising discharging means for discharging the surface of the image carrying means, wherein the lubricant application executing means executes the application of the lubricant to the image carrying means by actuating the developing means to apply the developer to a discharged area of the surface of the image carrying means between the developed electrostatic latent image formed for the preceding transfer material and the electrostatic latent image formed for the succeeding transfer material on the surface of the image carrying means.

18. The image forming apparatus according to claim 11, wherein the control means further includes an image writing pixel counting means for counting a number of image writing pixels of the image formed on the surface of the image carrying means, and wherein the writing pixel counting means provides the number of image writing pixels counted to the image area calculating means as an input used to calculate the image area formed on the surface of the image carrier.

19. The image forming apparatus according to claim 18, wherein the control means further includes image area ratio calculating means for calculating a ratio of the image area calculated by the image area calculating means relative to a running distance of the image carrying means, and wherein the lubricant application executing means executes the application of the lubricant to the surface of the image carrying means based on the ratio of the image area calculated by the image area ratio calculating means.

20. The image forming apparatus according to claim 19, wherein the control means controls the lubricant application executing means to adjust an amount of the lubricant applied to the surface of the image carrying means according to the ratio of the image area calculated by the image area ratio calculating means.

21. A method for forming an image, comprising the steps of:

rotating an image carrier;

forming an electrostatic latent image on the rotating image carrier;

developing the electrostatic latent image on the rotating image carrier with a developer including a lubricant;

transferring the developed image to a transfer material; and

at least controlling an application of the lubricant to the image carrier by controlling an application of the developer including the lubricant to the image carrier during one job of an image forming operation from a start of rotation of the image carrier to a stopping of the rotation of the image carrier based at least in part on calculating an area of image formation on the image carrier.