Claims
- 1. A developing device using a one-component developer, which device comprises:
- a vessel for holding a one-component developer composed of toner particles, said vessel being formed as a hopper having an opening formed therein such that the developer held in said hopper is moved toward said opening by gravity;
- a developing roller rotatably provided within the opening of said hopper in such a manner that a portion of said developing roller is exposed therefrom and faces the surface of an electrostatic latent image carrying body to form a developing area therebetween, said developing roller being rotated in such a manner that the surface thereof moves upward at said developing area, during the rotation of said developing roller, the toner particles being entrained by the surface of said developing roller to form a developer layer therearound, and being carried to said developing area for a development of an electrostatic latent image formed on said electrostatic latent image carrying body;
- a developer layer regulating means provided within the opening of said hopper and resiliently engaged with said developing roller for regulating a thickness of the developer layer formed around said developing roller, said developer layer regulating means being disposed below said developing roller to serve as a stopper for preventing a leakage of the toner particles from the opening of said hopper at an underside of said developing roller, and having an edge which is engaged with a moving surface of said developing roller as a leading edge for the regulation of the thickness of the developer layer;
- said developing roller being formed of a conductive open-cell foam rubber material constituted such that a penetration of the toner particles to the open-cell foam structure thereof is prevented, and such that pore openings appear over a surface of said developing roller so that, during a rotation of said developing roller, the toner particles are captured and held by the pore openings of said developing roller to form the developer layer therearound; and
- said developing roller having an Asker C-hardness of at most 50.degree., and is resiliently pressed against the surface of said electrostatic latent image carrying body, whereby the operating life of said electrostatic latent image carrying body can be prolonged.
- 2. A developing device as set forth in claim 1, wherein said developing roller has an Asker C-hardness of at most 50.degree., preferably 35.degree., and said developer layer regulating means is formed of a metal, whereby variations of the developer layer thickness regulated by said developer layer regulating means can be reduced.
- 3. A developing device as set forth in claim 1, wherein said conductive open-cell foam rubber material of which said developing roller is formed is a conductive open-cell foam polyurethane rubber material, whereby a resolution of a developed image can be maintained at a high level and over a long period.
- 4. A developing device as set forth in claim 1, wherein said conductive open-cell foam rubber material of which said developing roller is formed is a conductive open-cell foam polyurethane rubber material which is neutral with regard to frictional electrification, whereby the toner particles can be given a desired charge distribution by utilizing a triboelectrification between said developing roller and the toner particles.
- 5. A developing device using a one-component developer, which device comprises:
- a vessel for holding a one-component developer composed of toner particles, said vessel being formed as a hopper having an opening formed therein such that the developer held in said hopper is moved toward said opening by gravity;
- a developing roller rotatably provided within the opening of said hopper in such a manner that a portion of said developing roller is exposed therefrom and faces the surface of an electrostatic latent image carrying body to form a developing area therebetween, said developing roller being rotated in such a manner that the surface thereof moves upward at said developing area, during the rotation of said developing roller, the toner particles being entrained by the surface of said developing roller to form a developer layer therearound, and being carried to said developing area for a development of an electrostatic latent image formed on said electrostatic latent image carrying body;
- a developer layer regulating means provided within the opening of said hopper and resiliently engaged with said developing roller for regulating a thickness of the developer layer formed around said developing roller, said developer layer regulating means being disposed below said developing roller to serve as a stopper for preventing a leakage of the toner particles from the opening of said hopper at an underside of said developing roller, and having an edge which is engaged with a moving surface of said developing roller as a leading edge for the regulation of the thickness of the developer layer;
- wherein said developing roller is constituted so that a work function thereof approximates, preferably conforms with, that of the toner particles, and the toner particles are charged by a triboelectrification between said developer layer regulating means and the toner particles, whereby the toner particles can be given a desired charge distribution regardless of variations of temperature and air moisture contents.
- 6. A developing device as set forth in claim 5, wherein said developing roller being formed of a conductive open-cell foam rubber material constituted such that a penetration of the toner particles to the open-cell foam structure thereof is prevented, and such that pore openings appear over a surface of said developing roller so that, during a rotation of said developing roller, the toner particles are captured and held by the pore openings of said developing roller to form the developer layer therearound.
- 7. A developing device as set forth in claim 6, wherein said developing roller has an Asker C-hardness of at most 50.degree., preferably 35.degree., and is resiliently pressed against the surface of said electrostatic latent image carrying body, whereby the operating life of said electrostatic latent image carrying body can be prolonged.
- 8. A developing device as set forth in claim 6, wherein said developing roller has an Asker C-hardness of at most 50.degree., preferably 35.degree., and said developer layer regulating means is formed of a metal, whereby variations of the developer layer thickness regulated by said developer layer regulating means can be reduced.
- 9. A developing device as set forth in claim 6, wherein said conductive open-cell foam rubber material of which said developing roller is formed is a conductive open-cell foam polyurethane rubber material, whereby a resolution of a developed image can be maintained at a high level and over a long period.
- 10. A developing device using a one-component developer, which device comprises:
- a vessel for holding a one-component developer composed of toner particles, said vessel being formed as a hopper having an opening formed therein such that the developer held in said hopper is moved toward said opening by gravity;
- a developing roller rotatably provided within the opening of said hopper in such a manner that a portion of said developing roller is exposed therefrom and faces the surface of an electrostatic latent image carrying body to form a developing area therebetween, said developing roller being rotated in such a manner that the surface thereof moves upward at said developing area, during the rotation of said developing roller, the toner particles being entrained by the surface of said developing roller to form a developer layer therearound, and being carried to said developing area for a development of an electrostatic latent image formed on said electrostatic latent image carrying body;
- a developer layer regulating means provided within the opening of said hopper and resiliently engaged with said developing roller for regulating a thickness of the developer layer formed around said developing roller, said developer layer regulating means being disposed below said developing roller to serve as a stopper for preventing a leakage of the toner particles from the opening of said hopper at an underside of said developing roller, and having an edge which is engaged with a moving surface of said developing roller as a leading edge for the regulation of the thickness of the developer layer;
- wherein said developer layer regulating means is formed of a conductive material for applying a bias voltage thereto to prevent the toner particles from being electrostatically adhered to said developer layer regulating means; said developing roller and said developer layer regulating means are constituted in such a manner that work functions thereof approximate, preferably conform with, that of the toner particles; and the toner particles are charged b a charge-injection effect resulting from the application of the bias voltage to said developer layer regulation means, whereby the toner particles can be given a desired charge distribution regardless of variations of temperature and air moisture contents.
- 11. A developing device as set forth in claim 10, wherein said developing roller being formed of a conductive open-cell foam rubber material constituted such that a penetration of the toner particles to the open-cell foam structure thereof is prevented, and such that pore openings appear over a surface of said developing roller so that, during a rotation of said developing roller, the toner particles are captured and held by the pore openings of said developing roller to form the developer layer therearound.
- 12. A developing device as set forth in claim 11, wherein said developing roller has an Asker C-hardness of at most 50.degree., preferably 35.degree., and is resiliently pressed against the surface of said electrostatic latent image carrying body, whereby the operating life of said electrostatic latent image carrying body can be prolonged.
- 13. A developing device as set forth in claim 11, wherein said developing roller has an Asker C-hardness of at most 50.degree., preferably 35.degree., and said developer layer regulating means is formed of a metal, whereby variations of the developer layer thickness regulated by said developer layer regulating means can be reduced.
- 14. A developing device as set forth in claim 11, wherein said conductive open-cell foam rubber material of which said developing roller is formed is a conductive open-cell foam polyurethane rubber material, whereby a resolution of a developed image can be maintained at a high level and over a long period.
- 15. A developing device using a one-component developer, which device comprises:
- a vessel for holding a one-component developer composed of toner particles, said vessel being formed as a hopper having an opening formed therein such that the developer held in said hopper is moved toward said opening by gravity;
- a developing roller rotatably provided within the opening of said hopper in such a manner that a portion of said developing roller is exposed therefrom and faces the surface of an electrostatic latent image carrying body to form a developing area therebetween, said developing roller being rotated in such a manner that the surface thereof moves upward at said developing area, during the rotation of said developing roller, the toner particles being entrained by the surface of said developing roller to form a developer layer therearound, and being carried to said developing area for a development of an electrostatic latent image formed on said electrostatic latent image carrying body;
- a developer layer regulating means provided within the opening of said hopper and resiliently engaged with said developing roller for regulating a thickness of the developer layer formed around said developing roller, said developer layer regulating means being disposed below said developing roller to serve as a stopper for preventing a leakage of the toner particles from the opening of said hopper at an underside of said developing roller, and having an edge which is engaged with a moving surface of said developing roller as a leading edge for the regulation of the thickness of the developer layer;
- wherein said developer layer regulating means is formed of a conductive material for applying a bias voltage thereto to prevent the toner particles from being electrostatically adhered to said developer layer regulating means; and a charge-injection effect resulting from the application of the bias voltage to said developer layer regulation means and a triboelectrification between said developing roller and/or developer layer regulating means and said toner particles are utilized for charging the toner particles;
- said developing roller being formed of a conductive open-cell foam rubber material constituted such that a penetration of the toner particles to the open-cell foam structure thereof is prevented, and such that pore openings appear over a surface of said developing roller so that, during a rotation of said developing roller, the toner particles are captured and held by the pore openings of said developing roller to form the developer layer therearound; and
- said developing roller having an Asker C-hardness of at most 50.degree., and is resiliently pressed against the surface of said electrostatic latent image carrying body, whereby the operating life of said electrostatic latent image carrying body can be prolonged.
- 16. A developing device as set forth in claim 15, wherein said developing roller has an Asker C-hardness of at most 50.degree., preferably 35.degree., and said developer layer regulating means is formed of a metal, whereby variations of the developer layer thickness regulated by said developer layer regulating means can be reduced.
- 17. A developing device as set forth in claim 15, wherein said conductive open-cell foam rubber material of which said developing roller is formed is a conductive open-cell foam polyurethane rubber material, whereby a resolution of a developed image can be maintained at a high level and over a long period.
- 18. A developing device using a one-component developer, which device comprises:
- a vessel for holding a one-component developer composed of toner particles, said vessel being formed as a hopper having an opening formed therein such that the developer held in said hopper is moved toward said opening by gravity;
- a developing roller rotatably provided within the opening of said hopper in such a manner that a portion of said developing roller is exposed therefrom and faces the surface of an electrostatic latent image carrying body to form a developing area therebetween, said developing roller being rotated in such a manner that the surface thereof moves upward at said developing area, during the rotation of said developing roller, the toner particles being entrained by the surface of said developing roller to form a developer layer therearound, and being carried to said developing area for a development of an electrostatic latent image formed on said electrostatic latent image carrying body;
- a developer layer regulating means provided within the opening of said hopper and resiliently engaged with said developing roller for regulating a thickness of the developer layer formed around said developing roller, said developer layer regulating means being disposed below said developing roller to serve as a stopper for preventing a leakage of the toner particles from the opening of said hopper at an underside of said developing roller, and having an edge which is engaged with a moving surface of said developing roller as a leading edge for the regulation of the thickness, of the developer layer;
- wherein said developer layer regulating means is formed of a conductive material for applying a bias voltage thereto to prevent the toner particles from being electrostatically adhered to said developer layer regulating means; and when a charge-injection effect resulting from the application of the bias voltage to said developer layer regulation means is utilized for charging the toner particles, a difference between the bias voltage applied to said developer layer regulating means and a developing bias voltage applied to said developing roller is lower than a level at which a high electrical current or an electrical discharge occurs between said developer layer regulating means and said developing roller;
- said developing roller being formed of a conductive open-cell foam rubber material constituted such that a penetration of the toner particles to the open-cell foam structure thereof is prevented, and such that pore openings appear over a surface of said developing roller so that, during a rotation of said developing roller, the toner particles are captured and held by the pore openings of said developing roller to form the developer layer therearound; and
- said developing roller having an Asker C-hardness of at most 50.degree., and is resiliently pressed against the surface of said electrostatic latent image carrying body, whereby the operating life of said electrostatic latent image carrying body can be prolonged.
- 19. A developing device as set forth in claim 18, wherein said developing roller has an Asker C-hardness of at most 50.degree., preferably 35.degree., and said developer layer regulating means is formed of a metal, whereby variations of the developer layer thickness regulated by said developer layer regulating means can be reduced.
- 20. A developing device as set forth in claim 18, wherein said conductive open-cell foam rubber material of which said developing roller is formed is a conductive open-cell foam polyurethane rubber material, whereby a resolution of a developed image can be maintained at a high level and over a long period.
- 21. A developing device using a one-component developer, which device comprises:
- a vessel for holding a one-component developer composed of toner particles, said vessel being formed as a hopper having an opening formed therein such that the developer held in said hopper is moved toward said opening by gravity;
- a developing roller rotatably provided within the opening of said hopper and positioned at a lowermost area thereof in such a manner that a portion of said developing roller is exposed therefrom and faces the surface of an electrostatic latent image carrying body to form a developing area therebetween, said developing roller being rotated in such a manner that the surface thereof moves upward at said developing area, during the rotation of said developing roller, the toner particles being entrained by the surface of said developing roller to form a developer layer therearound, and being carried to said developing area for a development of an electrostatic latent image formed on said electrostatic latent image carrying body; and
- a developer layer regulating means provided within the opening of said hopper and resiliently engaged with said developing roller for regulating a thickness of the developer layer formed around said developing roller, said developer layer regulating means being disposed below said developing roller to serve as a stopper for preventing a leakage of the toner particles from the opening of said hopper at an underside of said developing roller, and having an edge which is engaged with a moving surface of said developing roller as a leading edge for the regulation of the thickness of the developer layer.
- 22. A developing device as set forth in claim 21, wherein said developer layer regulating means has an edge which is engaged with a moving surface of said developing roller as a leading edge.
- 23. A developing device as set forth in claim 22, wherein said developer layer regulating means is tangentially arranged with respect to the moving surface of said developing roller.
- 24. A developing device using a one-component developer, which device comprises;
- a vessel for holding a one-component developer composed of toner particles, said vessel being formed as a hopper having an opening formed therein such that the developer held in said hopper is moved toward said opening by gravity;
- a developing roller rotatably provided within the opening of said hopper and positioned at a lowermost area thereof in such a manner that a portion of said developing roller is exposed therefrom and faces the surface of an electrostatic latent image carrying body to form a developing area therebetween, said developing roller being rotated in such a manner that the surface thereof moves upward at said developing area, during the rotation of said developing roller, the toner particles being entrained by the surface of said developing roller to form a developer layer therearound, and being carried to said developing area for a development of an electrostatic latent image formed on said electrostatic latent image carrying body;
- a developer layer regulating means provided within the opening of said hopper and resiliently engaged with said developing roller for regulating a thickness of the developer layer formed around said developing roller, said developer layer regulating means being disposed below said developing roller to serve as a stopper for preventing a leakage of the toner particles from the opening of said hopper at an underside of said developing roller, and having an edge which is engaged with a moving surface of said developing roller as a leading edge for the regulation of the thickness of the developer layer; and
- wherein said developing roller is constituted so that a work function thereof approximates, preferably conforms with, that of the toner particles, and the toner particles are charged by a triboelectrification between said developer layer regulating means and the toner particles, whereby the toner particles can be given a desired charge distribution regardless of variations of temperature and air moisture contents.
- 25. A developing device as set forth in claim 24, wherein said developer layer regulating means has an edge which is engaged with a moving surface of said developing roller as a leading edge.
- 26. A developing device as set forth in claim 25, wherein said developer layer regulating means is tangentially arranged with respect to the moving surface of said developing roller.
- 27. A developing device using a one-component developer, which device comprises:
- a vessel for holding a one-component developer composed of toner particles, said vessel being formed as a hopper having an opening formed therein such that the developer held in said hopper is moved toward said opening by gravity:
- a developing roller rotatably provided within the opening of said hopper and positioned at a lowermost area thereof in such a manner that a portion of said developing roller is exposed therefrom and faces the surface of an electrostatic latent image carrying body to form a developing area therebetween, said developing roller being rotated in such a manner that the surface thereof moves upward at said developing area, during the rotation of said developing roller, the toner particles being entrained by the surface of said developing roller to form a developer layer therearound, and being carried to said developing area for a development of an electrostatic latent image formed on said electrostatic latent image carrying body;
- a developer layer regulating means provided within the opening of said hopper and resiliently engaged with said developing roller for regulating a thickness of the developer layer formed around said developing roller, said developer layer regulating means being disposed below said developing roller to serve as a stopper for preventing a leakage of the toner particles from the opening of said hopper at an underside of said developing roller, and having an edge which is engaged with a moving surface of said developing roller as a leading edge for the regulation of the thickness of the developer layer; and
- wherein when the toner particles are charged by a triboelectrification between said developing roller and developer layer regulating means and the toner particles, said developing roller and developer layer regulating means are constituted in such a manner that a relationship of work functions W.sub.1 and W.sub.2 thereof and a work function W.sub.1 of the toner particles is defined by the following formula:
- (W.sub.1 -W.sub.1).times.(W.sub.2 -W.sub.3)>0
- whereby the toner particles can be given a desired distribution.
- 28. A developing device as set forth in claim 27, wherein said developer layer regulating means has an edge which is engaged with a moving surface of said developing roller as a leading edge.
- 29. A developing device as set forth in claim 28, wherein said developer layer regulating means is tangentially arranged with respect to the moving surface of said developing roller.
- 30. A developing device as set forth in claim 27, wherein said developing roller being formed of a conductive open-cell foam rubber material constituted such that a penetration of the toner particles to the open-cell foam structure thereof is prevented, and such that pore openings appear over a surface of said developing roller so that, during a rotation of said developing roller, the toner particles are captured and held by the pore openings of said developing roller to form the developer layer therearound.
- 31. A developing device as set forth in claim 27, wherein said developing roller has an Asker C-hardness of at most 50.degree., preferably 35.degree., and is resiliently pressed against the surface of said electrostatic latent image carrying body, whereby the operating life of said electrostatic latent image carrying body can be prolonged.
- 32. A developing device as set forth in claim 27, wherein said developing roller has an Asker C-hardness of at most 50.degree., preferably 35.degree., and said developer layer regulating means is formed of a metal material, whereby variations of the developer layer thickness regulated by said developer layer regulating means can be reduced.
- 33. A developing device as set forth in claim 27, wherein said conductive open-cell foam rubber material of which said developing roller is formed is a conductive open-cell foam polyurethane rubber material, whereby a resolution of a developed image can be maintained at a high level and over a long period.
- 34. A developing device using a one-component developer, which device comprises:
- a vessel for holding a one-component developer composed of toner particles, said vessel being formed as a hopper having an opening formed therein such that the developer held in said hopper is moved toward said opening by gravity;
- a developing roller rotatably provided within the opening of said hopper and positioned at a lowermost area thereof in such a manner that a portion of said developing roller is exposed therefrom and faces the surface of an electrostatic latent image carrying body to form a developing area therebetween, said developing roller being rotated in such a manner that the surface thereof moves upward at said developing area, during the rotation of said developing roller, the toner particles being entrained by the surface of said developing roller to form a developer layer therearound, and being carried to said developing area for a development of an electrostatic latent image formed on said electrostatic latent image carrying body;
- a developer layer regulating means provided within the opening of said hopper and resiliently engaged with said developing roller for regulating a thickness of the developer layer formed around said developing roller, said developer layer regulating means being disposed below said developing roller to serve as a stopper for preventing a leakage of the toner particles from the opening of said hopper at an underside of said developing roller, and having an edge which is engaged with a moving surface of said developing roller as a leading edge for the regulation of the thickness of the developer layer; and
- wherein said developer layer regulating means is formed of a conductive material for applying a bias voltage thereto to prevent the toner particles from being electrostatically adhered to said developer layer regulating means; said developing roller and said developer layer regulating means are constituted in such a manner that work functions thereof approximate, preferably conform with, that of the toner particles; and the toner particles are charged by a charge-injection effect resulting from the application of the bias voltage to said developer layer regulation means, whereby the toner particles can be given a desired charge distribution regardless of variations of temperature and air moisture contents.
- 35. A developing device as set forth in claim 34, wherein said developer layer regulating means has an edge which is engaged with a moving surface of said developing roller as a leading edge.
- 36. A developing device as set forth in claim 35, wherein said developer layer resulting means is tangentially arranged with respect to the moving surface of said developing roller.
- 37. A developing device using a one-component developer, which device comprises:
- a vessel for holding a one-component developer composed of toner particles, said vessel being formed as a hopper having an opening formed therein such that the developer held in said hopper is moved toward said opening by gravity;
- a developing roller rotatably provided within the opening of said hopper and positioned at a lowermost area thereof in such a manner that a portion of said developing roller is exposed therefrom and faces the surface of an electrostatic latent image carrying body to form a developing area therebetween, said developing roller being rotated in such a manner that the surface thereof moves upward at said developing area, during the rotation of said developing roller, the toner particles being entrained by the surface of said developing roller to form a developer layer therearound, and being carried to said developing area for a development of an electrostatic latent image formed on said electrostatic latent image carrying body;
- a developer layer regulating means provided within the opening of said hopper and resiliently engaged with said developing roller for regulating a thickness of the developer layer formed around said developing roller, said developer layer regulating means being disposed below said developing roller to serve as a stopper for preventing a leakage of the toner particles from the opening of said hopper at an underside of said developing roller, and having an edge which is engaged with a moving surface of said developing roller as a leading edge for the regulation of the thickness of the developer layer; and
- wherein said developer layer regulating means is formed of a conductive material for applying a bias voltage thereto to prevent the toner particles from being electrostatically adhered to said developer layer regulating means; and a charge-injection effect resulting from the application of the bias voltage to said developer layer regulation means and a triboelectrification between said developing roller and/or developer layer regulating means and said toner particles are utilized for charging the toner particles.
- 38. A developing device as set forth in claim 37, wherein said developer layer regulating means has an edge which is engaged with a moving surface of said developing roller as a leading edge.
- 39. A developing device as set forth in claim 38, wherein said developer layer regulating means is tangentially arranged with respect to the moving surface of said developing roller.
- 40. A developing device using a one-component developer, which device comprises;
- a vessel for holding a one-component developer composed of toner particles, said vessel being formed as a hopper having an opening formed therein such that the developer held in said hopper is moved toward said opening by gravity;
- a developing roller rotatably provided within the opening of said hopper and positioned at a lowermost area thereof in such a manner that a portion of said developing roller is exposed therefrom and faces the surface of an electrostatic latent image carrying body to form a developing area therebetween, said developing roller being rotated in such a manner that the surface thereof moves upward at said developing area, during the rotation of said developing roller, the toner particles being entrained by the surface of said developing roller to form a developer layer therearound, and being carried to said developing area for a development of an electrostatic latent image formed on said electrostatic latent image carrying body;
- a developer layer regulating means provided within the opening of said hopper and resiliently engaged with said developing roller for regulating a thickness of the developer layer formed around said developing roller, said developer layer regulating means being disposed below said developing roller to serve as a stopper for preventing a leakage of the toner particles from the opening of said hopper at an underside of said developing roller, and having an edge which is engaged with a moving surface of said developing roller as a leading edge for the regulation of the thickness of the developer layer; and
- wherein said developer layer regulating means is formed of a conductive material for applying a bias voltage thereto to prevent the toner particles from being electrostatically adhered to said developer layer regulating means; and when a charge injection effect resulting from the application of the bias voltage to said developer layer regulation means is utilized for charging the toner particles, a difference between the bias voltage applied to said developer layer regulating means and a developing bias voltage applied to said developing roller is lower than a level at which a high electrical current or an electrical discharge occurs between said developer layer regulating means and said developing roller.
- 41. A developing device as set forth in claim 40, wherein said developer layer regulating means has an edge which is engaged with a moving surface of said developing roller as a leading edge.
- 42. A developing device as set forth in claim 41, wherein said developer layer regulating means is tangentially arranged with respect to the moving surface of said developing roller.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-198004 |
Aug 1989 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/066,272, filed Mar. 12, 1993, now abandoned, which is a continuation of application Ser. No. 07/557,057 filed Jul. 25, 1990, now abandoned.
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Continuations (2)
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Number |
Date |
Country |
Parent |
66272 |
Mar 1993 |
|
Parent |
557057 |
Jul 1990 |
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