Image forming apparatus rotationally driving image bearing member and contact electrifying member of process cartridge and process cartridge comprising image bearing member and contact electrifying member

An image forming apparatus to which a process cartridge having an image bearing member, a contact electrifying member configured and positioned to charge the image bearing member, detection means for detecting a developer remaining amount or developer consumption amount, and storage means, is detachably attachable, said image forming apparatus comprising:

• first drive means for rotationally driving the image bearing member;
• second drive means for rotationally driving the contact electrifying member;
• and
• control means for controlling the driving speeds of said first drive means and said second drive means and calculating the accumulated abrasive sliding distance of the image bearing member and the contact electrifying member, wherein
• the storage means stores data representing one or more rotation speeds of said second drive means corresponding to the accumulated abrasive sliding distance;
• and
• said control means controls the driving speed of said second drive means on the basis of data representing a rotation speed stored in the storage means.

An image forming apparatus to which a process cartridge having an image bearing member, a contact electrifying member configured and positioned to charge the image bearing member, detection means for detecting a developer remaining amount or developer consumption amount, and storage means, is detachably attachable, said image forming apparatus comprising:

• first drive means for rotationally driving the image bearing member;
• second drive means for rotationally driving the contact electrifying member;
• and
• control means for controlling the driving speeds of said first drive means and said second drive means, calculating the accumulated abrasive sliding distance of the image bearing member and the contact electrifying member, and writing data representing two or more of the calculated accumulated abrasive sliding distances and data representing the developer remaining amount or the developer consumption amount detected by the detection means in the storage means;
• wherein said control means calculates a rotation speed of said second drive means on the basis of data representing two or more of the accumulated abrasive sliding distances and the developer remaining amount or developer consumption amount stored in the storage means to control said second drive means on the basis of the calculated rotation speed.

A process cartridge that is detachably attachable to an image forming apparatus including first drive means for rotationally driving an image bearing member, second drive means for rotationally driving a contact electrifying member, and control means for controlling the driving speeds of the first drive means and the second drive means and calculating the accumulated abrasive sliding distance of said image bearing member and said contact electrifying member, said cartridge comprising:

• said image bearing member;
• said contact electrifying member configured and positioned to charge said image bearing member;
• detection means for detecting a developer remaining amount or a developer consumption amount;
• and
• storage means for storing at least data representing one rotation speed corresponding to the accumulated abrasive sliding distance for controlling the driving speed of the second drive means.

A process cartridge that is detachably attachable to an image forming apparatus including first drive means for rotationally driving an image bearing member, second drive means for rotationally driving a contact electrifying member, and control means for controlling driving speeds of the first drive means and the second drive means and calculating the accumulated abrasive sliding distance of said image bearing member and said contact electrifying member, said cartridge comprising:

• said image bearing member;
• said contact electrifying member configured and positioned to charge said image bearing member;
• detection means for detecting a developer remaining amount or a developer consumption amount;
• and
• storage means for storing data representing two or more of the accumulated abrasive sliding distances, and the developer remaining amount or developer consumption amount therein.

An image forming apparatus comprising:

• an image bearing member;
• a contact electrifying member configured and positioned to charge said image bearing member;
• storage means for storing data according to a developer remaining amount;
• and
• control means for variably controlling peripheral speeds of said image bearing member and said contact electrifying means in accordance with the data stored in said storage means.

An image forming apparatus comprising:

• an image bearing member;
• a contact electrifying member configured and positioned to charge said image bearing member;
• storage means for storing data according to a used developer amount;
• and
• control means for calculating an accumulated abrasive sliding distance of said image bearing member and said contact electrifying member to variably control peripheral speeds of said image bearing member and said contact electrifying member in accordance with the calculated accumulated abrasive sliding distance and the data stored in said storage means.