EP0528045A1
Expired / Lapsed
EP
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Image forming device
Assignee: Fujitsu Ltd
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Filing: 1992-03-10
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Granted: —
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Expires: 2012-03-10
Abstract
Abstract This is an image forming device for supplying a developing agent to a developing section for developing a latent image in an electrophotographing apparatus and the like. A developing agent supply member (37) is formed of a soft foamed synthetic resin material provided with electric conductivity, in which, out of the values of its physical properties, when F = S.ρ/H , where hardness is H (kgf), density is ρ (kg/m³) and the number of cells is S (cell/inch), then F is set to 72 to 114. Or, a movement velocity of the developping agent supply member (37) at a contact portion (3) is set at 1.4 to 1.7 times the movement velocity of a developing agent conveying member (32). Due to this, an optimum amount of the developing agent can be supplied to the developing agent conveying member for conveying the developing agent to the developing section, so that a good printing quality can be obtained.
Inventors
- 👤 Masae Fujitsu Limited 1015 Kamikodanaka Ikeda
- 👤 Hideki Fujitsu Limited Kamaji
- 👤 Kazunori Fujitsu Limited Hirose
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 14:07
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0808; G03G15/0822
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
165 words
An image forming device comprising: a developing agent transporting body (32) provided in a developing unit (30) so as to transport developing agent (1) consisting of minute grains, by carrying said agent to a developing portion (2) on a surface of the developing agent transporting body, and a developing agent supplying body (37) contacted by said developing agent transporting body (32) surface-to-surface on a contact surface (3) and provided for supplying developing agent (1), contained in said developing unit (30), to the surface of said developing agent transporting body (32) by moving in a direction opposite to that of said developing agent transporting body at said contact surface (3), and characterized in that: said developing agent supplying body (37) is made of soft synthetic foam resin material imparted with conductivity, having a property of F maintained between the values of 72 and 114, F being defined by F = S·ρ/H , where H is hardness (kgf), ρ is density (kg/m³), S is cell count (cells/inch).
Claim 2
Dependent Claim
30 words
An image forming device as claimed in claim 1, wherein a density ρ (kg/m³) of said developing agent supplying body (37) is maintained within the range of 28 - 30.
Claim 3
Dependent Claim
30 words
An image forming device as claimed in claim 1, wherein a hardness H (kgf) of said developing agent supplying body (37) is maintained within the range of 9 - 15.
Claim 4
Dependent Claim
30 words
An image forming device as claimed in claim 2, wherein a hardness H (kgf) of said developing agent supplying body (37) is maintained within the range of 9 - 15.
Claim 5
Dependent Claim
24 words
An image forming device as claimed in claim 1, wherein a cell count S (cells/inch) is maintained within the range of 32 - 42.
Claim 6
Dependent Claim
24 words
An image forming device as claimed in claim 2, wherein a cell count S (cells/inch) is maintained within the range of 32 - 42.
Claim 7
Dependent Claim
24 words
An image forming device as claimed in claim 3, wherein a cell count S (cells/inch) is maintained within the range of 32 - 42.
Claim 8
Dependent Claim
24 words
An image forming device as claimed in claim 4, wherein a cell count S (cells/inch) is maintained within the range of 32 - 42.
Claim 9
Dependent Claim
49 words
An image forming device as claimed in claim 1, wherein a work function (eV) of said developing agent supplying body (37) has a value smaller than a work function (eV) of said developing agent (1) in the event that said developing agent (1) is negatively charged in actual operation.
Claim 10
Dependent Claim
49 words
An image forming device as claimed in claim 2, wherein a work function (eV) of said developing agent supplying body (37) has a value smaller than a work function (eV) of said developing agent (1) in the event that said developing agent (1) is negatively charged in actual operation.
Claim 11
Dependent Claim
49 words
An image forming device as claimed in claim 3, wherein a work function (eV) of said developing agent supplying body (37) has a value smaller than a work function (eV) of said developing agent (1) in the event that said developing agent (1) is negatively charged in actual operation.
Claim 12
Dependent Claim
49 words
An image forming device as claimed in claim 4, wherein a work function (eV) of said developing agent supplying body (37) has a value smaller than a work function (eV) of said developing agent (1) in the event that said developing agent (1) is negatively charged in actual operation.
Claim 13
Dependent Claim
49 words
An image forming device as claimed in claim 5, wherein a work function (eV) of said developing agent supplying body (37) has a value smaller than a work function (eV) of said developing agent (1) in the event that said developing agent (1) is negatively charged in actual operation.
Claim 14
Dependent Claim
49 words
An image forming device as claimed in claim 6, wherein a work function (eV) of said developing agent supplying body (37) has a value smaller than a work function (eV) of said developing agent (1) in the event that said developing agent (1) is negatively charged in actual operation.
Claim 15
Dependent Claim
49 words
An image forming device as claimed in claim 7, wherein a work function (eV) of said developing agent supplying body (37) has a value smaller than a work function (eV) of said developing agent (1) in the event that said developing agent (1) is negatively charged in actual operation.
Claim 16
Dependent Claim
49 words
An image forming device as claimed in claim 8, wherein a work function (eV) of said developing agent supplying body (37) has a value smaller than a work function (eV) of said developing agent (1) in the event that said developing agent (1) is negatively charged in actual operation.
Claim 17
Dependent Claim
148 words
An image forming device comprising: a developing agent transporting body (32) provided in a developing unit (30) so as to transport developing agent (1) consisting of minute grains, by carrying said agent to a developing portion (2) on a surface of the developing agent transporting body, and a developing agent supplying body (37) contacted by said developing agent transporting body (32) surface-to-surface on a contact surface (3) and provided for supplying developing agent (1), contained in said developing unit (30), to the surface of said developing agent transporting body (32) by moving in the direction opposite to that of said developing agent transporting body at said contact surface (3), and characterized in that the moving speed, as measured at said contact surface (3), of said developing agent supplying body (37) is set to be at 1.4 to 1.7 times the speed of said developing agent transporting body (32).
Claim 18
Dependent Claim
60 words
An image forming devide as claimed in claim 17, wherein said developing agent transporting body (32) and said developing agent supplying body (37) both are roller-like and have a circular cross section, and the peripheral speed of said developing agent supplying body (37) is set to be 1.4 to 1.7 times the speed of said developing agent transporting body (32).
References Cited (Backward Citations)
No citation records indexed.
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