EP0205178A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Developing device
Assignee: Panasonic Holdings Corp
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Filing: 1986-06-12
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Granted: —
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Expires: 2006-06-12
Abstract
Abstract A developing device for developing a latent electrostatic image for an electrophotographic copying machine includes a cylindrical resilient body such as a fur brush or a roller of sponge for triboelectrically uniformly charging a single component developer of the dry type supplied from a developer storage casing and for coating the developer as a uniform thin layer on a developer carrier such as a developing roller.
Inventors
- 👤 Taizo Ono
- 👤 Yoshihiro Katayama
- 👤 Hayato Kamada
- 👤 Hidenori Kunishige
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 16:07
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/081; G03G2215/00; G03G2215/06; G03G2215/0602; G03G2215/0604; G03G2215/0614; G03G2215/0634; G03G2215/0636
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
130 words
A developing device for visualizing a latent electrostatic image formed on a latent image carrier, comprising: an endless movable developer carrier for carrying a developer thereon; means for charging the developer; means for transferring and coating the charged developer as a layer on said developer carrier under at least an electric field; means for limiting the thickness of said layer of the deverloper on said developer carrier to a prescribed thickness; said transferring and coating means and said thickness limiting means being successively disposed in the direction in which said developer carrier moves; and the arrangement being such that the developer will not be supplied to said developer carrier between said thickness limiting means and the position in which the charged developer is transferred and coated on said developer carrier.
Claim 2
Dependent Claim
130 words
A developing device for visualizing a latent electrostatic image formed on a latent image carrier, comprising: an endless movable developer carrier for carrying a developer thereon; means for charging the developer; means for transferring and coating the charged developer as a layer on said developer carrier under at least an electric field; means for limiting the thickness of said layer of the deverloper on said developer carrier to a prescribed thickness; said transferring and coating means and said thickness limiting means being successively disposed in the direction in which said developer carrier moves; and the arrangement being such that the developer will not be supplied to said developer carrier between said thickness limiting means and the position in which the charged developer is transferred and coated on said developer carrier.
Claim 3
Dependent Claim
27 words
A developing device according to claim 1, wherein the developer on said developer carrier and said latent image carrier are held out of contact with each other.
Claim 4
Dependent Claim
24 words
A developing device according to claim 2, including means for applying a DC electric field between said developer carrier and said latent image carrier.
Claim 5
Dependent Claim
67 words
A developing device according to claim 1, including a casing for containing the developer, said casing having an outlet at one end thereof, said developer carrier being disposed in said outlet, and a resilinet sheet having one end fixedly mounted in said casing and the other end normally urged under its own resiliency in a direction to urge the developer within said casing toward said developer carrier.
Claim 6
Dependent Claim
98 words
A developing device according to claim 1, including a casing for containing the developer, said casing having an outlet at one end thereof, said developer carrier being disposed in said outlet, said charging means comprising a cylindrical resilient body rotatably mounted in said casing in confronting relation to said developer carrier, and a swingable resilient sheet having one end fixedly mounted in said casing and the other end held in contact with the outer circumferential surface of said cylindrical resilient body, said swingable resilient sheet being vibratable under its own resiliency on rotation of said cylindrical resilient body.
Claim 7
Dependent Claim
16 words
A developing device according to claim 1, wherein said thickness limiting means comprises a resilient blade.
Claim 8
Dependent Claim
16 words
A developing device according to claim 1, wherein said thickness limiting means comprises a rigid blade.
Claim 9
Dependent Claim
80 words
A developing device according to claim 6, wherein said blade has one end serving as a pivot with the other end pressed against the outer circumferential surface of said developer carrier, said pivot being positioned such that said other end of the blade is forced toward said developer carrier under frictional forces imposed on said other end on movement of said developer carrier, said other end of the blade having a thickness larger than'that of the rest of said blade.
Claim 10
Dependent Claim
81 words
A developing device according to claim 7, wherein said blade has one end serving as a pivot with the other end pressed against the outer circumferential surface of said developer carrier, said pivot being positioned such that said other end of the blade is forced toward said developer carrier under frictional forces imposed on said other end on movement of said developer carrier, said other end of the blade having a thickness larger than that of the rest of said blade.
Claim 11
Dependent Claim
82 words
A developing device according to claim 6, wherein said blade has one end serving as a pivot with the other end pressed against the outer circumferential surface of said developer carrier, said pivot being positioned such that said other end of the blade is forced away from said developer carrier under frictional forces imposed on said other end on movement of said developer carrier, said other end of the blade having a thickness larger than that of the rest of said blade.
Claim 12
Dependent Claim
83 words
ll. A developing device according to claim 7, wherein said blade has one end serving as a pivot with the other end pressed against the outer circumferential surface of said developer carrier, said pivot being positioned such that said other end of the blade is forced away from said developer carrier under frictional forces imposed on said other end on movement of said developer carrier, said other end of the blade having a thickness larger than that of the rest of said blade.
Claim 13
Dependent Claim
28 words
A developing device according to claim 1, wherein said charging means includes a cylindrical resilient body rotatable to cause friction on the developer for triboelectrically charging the developer.
Claim 14
Dependent Claim
61 words
A developing device according to claim 12, further including a partition having an end held against said cylindrical resilient body downstream of the position in which said cylindrical resilient body and said developer carrier confront each other, with respect to the direction in which said cylindrical resilient body rotates, so that said partition prevents the developer from reaching said last-mentioned position.
Claim 15
Dependent Claim
44 words
A developing device according to claim 12, further including a scraper plate held in slidable contact with said cylindrical resilient body for scraping off an excessive amount of the developer from said cylindrical resilient body to uniformize the developer on said cylindrical resilient body.
Claim 16
Dependent Claim
30 words
A developing device according to claim 12, wherein said transferring and coating means comprises voltage applying means for applying a voltage between said developer carrier and said cylindrical resilient body.
Claim 17
Dependent Claim
25 words
A developing device according to claim 15, wherein said voltage applying means comprises means for applying an AC voltage with a DC voltage added thereto.
Claim 18
Dependent Claim
58 words
A developing device according to claim 12, wherein said developer carrier and said cylindrical resilient body are held in contact with each other, and rotatable in one direction in the position in which they are held in contact with each other, said cylindrical resilient body being rotatable at a peripheral speed higher than that of said developer carrier.
Claim 19
Dependent Claim
58 words
A developing device according to claim 12, wherein said developer carrier and said cylindrical resilient body are held in contact with each other, and rotatable in one direction in the position in which they are held in contact with each other, said developing carrier being rotatable at a peripheral speed higher than that of said cylindrical resilient body.
Claim 20
Dependent Claim
25 words
A developing device according to claim 12, wherein said developer carrier and said cylindrical resilient body are held in spaced-apart confronting relation to each other.
Claim 21
Dependent Claim
16 words
A developing device according to claim 12, wherein said cylindrical resilient body comprises a fur brush.,
Claim 22
Dependent Claim
17 words
A developing device according to claim 12, wherein said cylindrical resilient body comprises a roller cf sponge.
Claim 23
Dependent Claim
14 words
A developing device according to claim 20, wherein said fur brush is electrically conductive.
Claim 24
Dependent Claim
15 words
A developing device according to claim 21, wherein said roller of sponge is electrically conductive.
Claim 25
Dependent Claim
71 words
A developing device according to claim 21, wherein each of said developer carrier and said cylindrical resilient body is made of an electrically conductive material, said developer carrier and said cylindrical resilient body being held in contact with each other, further including voltage applying means for applying a voltage between said developer carrier and said cylindrical resilient body, and detecting means for detecting a current flowing from said voltage applying means.
Claim 26
Dependent Claim
127 words
A developing device for visualizing a latent electrostatic image formed on a latent image carrier, comprising: an endless movable developer carrier for carrying a developer thereon; means for charging the developer; means for transferring and coating the charged developer as a layer on said developer carrier under at least an electric field; means for limiting the thickness of said layer of the developer on said developer carrier to a prescribed thickness; and the arrangement being such that the developer will not be supplied to said developer carrier upstream of the position in which the charged developer is transferred and coated on said developer carrier and downstream of an image developing area on said latent image carrier, with respect to the direction in which said developer carrier moves.
Claim 27
Dependent Claim
127 words
A developing device for visualizing a latent electrostatic image formed on a latent image carrier, comprising: an endless movable developer carrier for carrying a developer thereon; means for charging the developer; means for transferring and coating the charged developer as a layer on said developer carrier under at least an electric field; means for limiting the thickness of said layer of the developer on said developer carrier to a prescribed thickness; and the arrangement being such that the developer will not be supplied to said developer carrier upstream of the position in which the charged developer is transferred and coated on said developer carrier and downstream of an image developing area on said latent image carrier, with respect to the direction in which said developer carrier moves.
References Cited (Backward Citations)
No citation records indexed.
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