Developing device, process cartridge and electrophotographic image forming apparatus

A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, comprising:

• an electrophotographic photosensitive drum;
• a photosensitive drum coupling for receiving from the main assembly of the apparatus a driving force for rotating said photosensitive drum when said process cartridge is mounted to the main assembly of the apparatus;
• a developing roller for developing an electrostatic latent image formed on said photosensitive drum;
• a developing roller coupling for receiving from the main assembly of the apparatus a driving force for rotating said developing roller when said process cartridge is mounted to the main assembly of the apparatus;
• a developing bias contact for receiving from the main assembly of the apparatus a developing bias for applying to said developing roller when said process cartridge is mounted to the main assembly of the apparatus;
• a charging member for charging said photosensitive drum;
• a charging bias contact for receiving from the main assembly of the apparatus a charging bias for applying to said charging member when said process cartridge is mounted to the main assembly of the apparatus;
• an electroconductive brush contacted to said photosensitive drum;
• an electroconductive brush contact for receiving from the main assembly of the apparatus a bias voltage having a polarity opposite from the charging bias for applying to the electroconductive brush when said process cartridge is mounted to the main assembly of the apparatus;
• a developer content detecting member for detecting a mixing ratio of toner and carrier in developer to be used by said developing roller to develop the electrostatic latent image;
• a connector portion for transmitting a result of detection by said detecting member to the main assembly of the apparatus by electrical connection to the main assembly of the apparatus;
• a grounding contact for electrically grounding said photosensitive drum when said process cartridge is mounted to the main assembly of the apparatus;
• wherein said photosensitive drum coupling, developing roller coupling, developing bias contact, charging bias contact, electroconductive brush contact and connector portion are disposed at a leading end of said process cartridge when said process cartridge is mounted to the main assembly of the apparatus, and said grounding contact is disposed at a trailing end of said process cartridge when said process cartridge is mounted to the main assembly of the apparatus, wherein said connector portion, said developing roller coupling and said developing bias contact are arranged such that they are positioned in this order from a top side to a bottom side of the process cartridge, when said process cartridge is mounted to the main assembly of the apparatus, and wherein said process cartridge is mounted to the main assembly of the apparatus along a longitudinal direction of said developing roller.

A developing device detachably mountable to a main assembly of an electrophotographic image forming apparatus, comprising:

• a developing member for developing an electrostatic latent image formed on an electrophotographic photosensitive member;
• a developing member driving force receiving portion for receiving from the main assembly of the apparatus a driving force for rotating said developing member when said developing device is mounted to the main assembly of the apparatus;
• a developing bias contact for receiving from the main assembly of the apparatus a developing bias voltage for applying the developing member when said developing device is mounted to the main assembly of the apparatus;
• a developer content detecting member for detecting a mixing ratio of toner and carrier in developer to be used for developing the electrostatic latent image by said developing member;
• a connector portion for transmitting a result of detection by said detecting member to the main assembly of the apparatus by electrical connection to the main assembly of the apparatus;
• wherein developing member driving force receiving portion, developing bias contact and connector portion are disposed at a leading end of said developing device when said developing device is mounted to the main assembly of the apparatus, and said connector portion and said developing bias contact are disposed with said developing member driving force receiving portion therebetween, and wherein said developing device is mounted to the main assembly of the apparatus along a longitudinal direction of said developing roller.

An electrophotographic image forming apparatus for forming an image on a recording material, to which a process cartridge is detachably mountable, said apparatus comprising:

• (a) a photosensitive member driving force transmitting portion;
• (b) a developing member driving force transmitting portion;
• (c) a mounting portion for mounting the process cartridge, said process cartridge including:
• electrophotographic photosensitive member;
• a photosensitive member driving force receiving portion for receiving from said photosensitive member driving force transmitting portion a driving force for rotating said photosensitive member when said process cartridge is mounted to the main assembly of the apparatus;
• a developing member for developing an electrostatic latent image formed on said photosensitive member;
• a developing member driving force receiving portion for receiving from said developing member driving force transmitting portion a driving force for rotating said developing member when said process cartridge is mounted to the main assembly of the apparatus;
• a developing bias contact for receiving from the main assembly of the apparatus a developing bias for applying to said developing member when said process cartridge is mounted to the main assembly of the apparatus;
• a developer content detecting member for detecting a mixing ratio of toner and carrier in developer to be used by said developing member to develop the electrostatic latent image;
• a connector portion for transmitting a result of detection by said detecting member to the main assembly of the apparatus by electrical connection to the main assembly of the apparatus;
• wherein said photosensitive member driving force receiving portion, developing member driving force receiving portion, developing bias contact and connector portion are disposed at a leading end of said process cartridge when said process cartridge is mounted to the main assembly of the apparatus, and said connector portion and said developing bias contact are disposed with said developing member driving force receiving portion therebetween, and wherein said process cartridge is mounted to the main assembly of the apparatus along a longitudinal direction of said developing member.

An electrophotographic image forming apparatus for forming an image on a recording material, to which a process cartridge is detachably mountable, said apparatus comprising:

• (a) a photosensitive drum driving force transmitting portion;
• (b) a developing member driving force transmitting portion;
• (c) a mounting portion for mounting the process cartridge, said process cartridge including:
• an electrophotographic photosensitive drum;
• a photosensitive drum coupling for receiving from said photosensitive drum driving force transmitting portion a driving force for rotating said photosensitive drum when said process cartridge is mounted to the main assembly of the apparatus;
• a developing roller for developing an electrostatic latent image formed on said photosensitive drum;
• a developing roller coupling for receiving from said developing member driving force transmitting portion a driving force for rotating said developing roller when said process cartridge is mounted to the main assembly of the apparatus;
• a developing bias contact for receiving from the main assembly of the apparatus a developing bias for applying to said developing roller when said process cartridge is mounted to the main assembly of the apparatus;
• a charging member for charging said photosensitive drum;
• a charging bias contact for receiving from the main assembly of the apparatus a charging bias for applying to said charging member when said process cartridge is mounted to the main assembly of the apparatus;
• an electroconductive brush contacted to said photosensitive drum;
• an electroconductive brush contact for receiving from the main assembly of the apparatus a bias voltage having a polarity opposite from the charging bias for applying to the electroconductive brush when said process cartridge is mounted to the main assembly of the apparatus;
• a developer content detecting member for detecting a mixing ratio of toner and carrier in developer to be used by said developing roller to develop the electrostatic latent image;
• a connector portion for transmitting a result of detection by said detecting member to the main assembly of the apparatus by electrical connection to the main assembly of the apparatus;
• a grounding contact for electrically grounding said photosensitive drum when said process cartridge is mounted to the main assembly of the apparatus;
• wherein said photosensitive drum coupling, developing roller coupling, developing bias contact, charging bias contact, electroconductive brush contact and connector portion are disposed at a leading end of said process cartridge when said process cartridge is mounted to the main assembly of the apparatus, and said grounding contact is disposed at a trailing end of said process cartridge when said process cartridge is mounted to the main assembly of the apparatus, wherein said connector portion, said developing roller coupling and said developing bias contact are arranged such that they are positioned in this order from a top side to a bottom side of the process cartridge, when said process cartridge is mounted to the main assembly of the apparatus, and wherein said process cartridge is mounted to the main assembly of the apparatus along a longitudinal direction of said developing roller.

An electrophotographic image forming apparatus for forming an image on a recording material, to which a developing device is detachably mountable, said apparatus comprising:

• (a) a developing member driving force transmitting portion;
• (b) a mounting portion for mounting said developing device, said developing device including:
• a developing member for developing an electrostatic latent image formed on an electrophotographic photosensitive member;
• a developing member driving force receiving portion for receiving from said developing member driving force transmitting portion a driving force for rotating said developing member when said developing device is mounted to the main assembly of the apparatus;
• a developing bias contact for receiving from the main assembly of the apparatus a developing bias voltage for applying the developing member when said developing device is mounted to the main assembly of the apparatus;
• a developer content detecting member for detecting a mixing ratio of toner and carrier in developer to be used for developing the electrostatic latent image by said developing member;
• a connector portion for transmitting a result of detection by said detecting member to the main assembly of the apparatus by electrical connection to the main assembly of the apparatus;
• wherein said developing member driving force receiving portion, developing bias contact and connector portion are disposed at a leading end of said developing device when said developing device is mounted to the main assembly of the apparatus, and said connector portion and said developing bias contact are disposed with said developing member driving force receiving portion therebetween, and wherein said developing device is mounted to the main assembly of the apparatus along a longitudinal direction of said developing member.