Patent EP0166544A1 successfully refreshed from Google Patents.
EP0166544A1
Expired / Lapsed
EP
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A developing process for two-coloured electrophotography and a developing apparatus for the same
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1985-05-31
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Granted: —
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Expires: 2005-05-31
Abstract
Abstract A developing process for two-colored electrophotography comprises: (1) feeding a developer to a non-magnetic sleeve, said developer comprising a first insulative and non-magnetic color toner charged with an electrical polarity, a second insulative and non-magnetic color toner charged with a different polarity from the charging polarity in the first color toner, and a magnetic carrier, (2) holding said developer on the sleeve, (3) transferring the first color toner from the sleeve to a first developing roller to hold on the first developing roller, (4) transferring the first color toner on the first developing roller to an electrostatic latent image on the surface of a photoreceptor with a different polarity from the charging polarity in the first color toner to form a visible image, (5) transferring the second color toner from the sleeve to a second developing roller to hold on the second developing roller, and (6) transferring the second color toner on the second developing roller to the other electrostatic latent image on the surface of the photoreceptor with the other polarity to form a visible image.
Inventors
- 👤 Masahiko Kubo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 23:07
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G13/00; G03G13/01; G03G15/01; G03G15/0105; G03G15/0126; G03G2215/00; G03G2215/06; G03G2215/0602; G03G2215/0604; G03G2215/0614; G03G2215/0619; G03G2215/0634; G03G2215/0636
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
177 words
A developing process for two-colored electrophotography comprising: (1) feeding a developer to a non-magnetic sleeve, said developer conprising a first insulative and non-magnetic color toner charged with an electrical polarity, a second insulative and non-magnetic color toner charged with a different polarity from the charging polarity in the first color toner, and a magnetic carrier, (2) holding said developer on the sleeve, (3) transferring the first color toner from the sleeve to a first developing roller to hold on the first developing roller, (4) transferring the first color toner on the first developing roller to an electrostatic latent image on the surface of a photoreceptor with a different polarity from the charging polarity in the first color toner to form a visible image, (5) transferring the second color toner from the sleeve to a second developing roller to hold on the second developing roller, and (6) transferring the second color toner on the second developing roller to the other electrostatic latent image on the surface of the photoreceptor with the other polarity to form a visible image.
Claim 2
Dependent Claim
177 words
A developing process for two-colored electrophotography comprising: (1) feeding a developer to a non-magnetic sleeve, said developer conprising a first insulative and non-magnetic color toner charged with an electrical polarity, a second insulative and non-magnetic color toner charged with a different polarity from the charging polarity in the first color toner, and a magnetic carrier, (2) holding said developer on the sleeve, (3) transferring the first color toner from the sleeve to a first developing roller to hold on the first developing roller, (4) transferring the first color toner on the first developing roller to an electrostatic latent image on the surface of a photoreceptor with a different polarity from the charging polarity in the first color toner to form a visible image, (5) transferring the second color toner from the sleeve to a second developing roller to hold on the second developing roller, and (6) transferring the second color toner on the second developing roller to the other electrostatic latent image on the surface of the photoreceptor with the other polarity to form a visible image.
Claim 3
Dependent Claim
28 words
A developing process for two-colored electrophotography according to claim 1, wherein said developer is held on the sleeve by means of a fixed magnet disposed within said sleeve.
Claim 4
Dependent Claim
35 words
A developing process for two-colored electrophotography according to claim 1 or 2, wherein a bias potential having a different polarity from the polarity of said first color toner is applied to the first developing roller.
Claim 5
Dependent Claim
36 words
A developing process for two-colored electrophotography according to claim 1, 2 or 3, wherein a bias potential having a different polarity from the polarity of said second color toner is applied to the second developing roller.
Claim 6
Dependent Claim
115 words
A developing apparatus comprising: (1) a non-magnetic sleeve, (2) a developer vessel containing a first insulative and non-magnetic color toner charged with an electrical polarity, a second insulative and non-magnetic color toner charged with a different polarity from the charging polarity in the first color toner, and a magnetic carrier, and located in the vicinity of the photoreceptor drum, (3) a feeding means for the developer to the non-magnetic sleeve when the latter is located in the vicinity of a photoreceptor drum, (4) a holding means for holding said developer on the sleeve, and (5) a first and a second developing roller, each of which is disposed between said holding means and said photoreceptor drum.
Claim 7
Dependent Claim
115 words
A developing apparatus comprising: (1) a non-magnetic sleeve, (2) a developer vessel containing a first insulative and non-magnetic color toner charged with an electrical polarity, a second insulative and non-magnetic color toner charged with a different polarity from the charging polarity in the first color toner, and a magnetic carrier, and located in the vicinity of the photoreceptor drum, (3) a feeding means for the developer to the non-magnetic sleeve when the latter is located in the vicinity of a photoreceptor drum, (4) a holding means for holding said developer on the sleeve, and (5) a first and a second developing roller, each of which is disposed between said holding means and said photoreceptor drum.
Claim 8
Dependent Claim
23 words
A developing apparatus according to claim 5, additionally comprising a fixed magnet disposed within said sleeve for holding said developer on the sleeve.
Claim 9
Dependent Claim
34 words
A developing apparatus according to claim 5 or 6, additionally comprising means for applying to the first developing roller a bias potential having a different polarity from the polarity of said first color toner.
Claim 10
Dependent Claim
35 words
A developing apparatus according to claim 5, 6 or 7, additionally comprising means for applying to the. second developing roller a bias potential having a different polarity from the polarity of said second color toner.
References Cited (Backward Citations)
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