US3584601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic brush belt development
Assignee: Xerox Corp
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Filing: 1968-10-28
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Granted: 1971-06-15
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Expires: 1988-10-28
Abstract
Abstract Xerographic apparatus for the magnetic brush development of latent electrostatic images with a two-component magnetic developer. The apparatus includes a nonmagnetic shield with a roughened face spaced from a parallel stretch of photoconductive material in a xerographic development zone. A rotatable array of spaced magnets is moved on the side of the plate remote from the photoconductor to move developer in brushing contact with the latent electrostatic image being developed. The magnetic array has alternating north and south faces extending transverse to the direction of movement of the magnets so that the developer alternately collapses and reforms during movement of the magnets to thereby move the developer in a direction opposite to the direction of movement of the magnets to develop images in the photoreceptor.
Inventors
- 👤 Lyman H Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
193 words
Apparatus for developing latent electrostatic images on a photoconductive surface with magnetic developer including rotatable endless belt means having magnetic field producing means on the surface thereof arranged with spaced north and south faces extending across the periphery of the belt means to define nonmagnetic spacings therebetween, means to support said rotatable endless belt means in spaced relation from a photoconductive surface to be developed at a distance less than the distance of the lines of magnetic force emanating from said magnetic field producing means, shield means adjacent said field producing means, positioned between said field producing means and the photoconductive surface, the face of said shield means remote from said magnets being roughened to prevent the smooth sliding of developer material thereacross and means to move said field producing means in a path of movement relative to said shield means to thereby cause magnetic developer material entrained on the roughened face of said shield means by the magnetic fields there adjacent to move in image developing contact with the photoconductive surface along the roughened face of said shield means in a direction opposite the direction of movement of said field producing means.
Claim 2
Dependent Claim
193 words
Apparatus for developing latent electrostatic images on a photoconductive surface with magnetic developer including rotatable endless belt means having magnetic field producing means on the surface thereof arranged with spaced north and south faces extending across the periphery of the belt means to define nonmagnetic spacings therebetween, means to support said rotatable endless belt means in spaced relation from a photoconductive surface to be developed at a distance less than the distance of the lines of magnetic force emanating from said magnetic field producing means, shield means adjacent said field producing means, positioned between said field producing means and the photoconductive surface, the face of said shield means remote from said magnets being roughened to prevent the smooth sliding of developer material thereacross and means to move said field producing means in a path of movement relative to said shield means to thereby cause magnetic developer material entrained on the roughened face of said shield means by the magnetic fields there adjacent to move in image developing contact with the photoconductive surface along the roughened face of said shield means in a direction opposite the direction of movement of said field producing means.
Claim 3
Dependent Claim
48 words
The apparatus as set forth in claim 1 wherein said endless belt means is supported on a plurality of rollers to entrain said belt means and said field producing means along a flat extent in the development zone for developing a large surface area of the photoconductive surface.
Claim 4
Dependent Claim
61 words
The apparatus as set forth in claim 2 wherein said shield means is substantially parallel with the linear extent of said belt means and said field producing means and includes an extension over the uppermost roller to permit the gravity fall of the magnetic developer away from said field producing means back to adjacent the lower portion of the endless belt.
Claim 5
Dependent Claim
39 words
The apparatus as set forth in claim 3 wherein said endless belt means and said field producing means are rotated in a downward direction through its linear extent to cause developer material entrained thereby to move upwardly relative thereto.
Claim 6
Dependent Claim
145 words
Apparatus for developing a developable surface of a member supporting latent electrostatic images with magnetic developer including magnetic field producing means including spaced north and south faces supported in closed-loop configuration with a portion thereof being located adjacent a developable surface in a xerographic development zone, shield means supported within the xerographic development zone intermediate the developable surface and said magnetic field producing means, shield means including a surface facing the developable surface capable of preventing the smooth sliding of magnetic developer there across and means to move said magnetic field producing means with respect to said shield means of that developer material entrained on the surface of said shield means will move across said shield means in a direction opposite from the direction of movement of said magnetic field producing means to thereby contact and develop the latent electrostatic images on the developable surface.
Claim 7
Dependent Claim
145 words
Apparatus for developing a developable surface of a member supporting latent electrostatic images with magnetic developer including magnetic field producing means including spaced north and south faces supported in closed-loop configuration with a portion thereof being located adjacent a developable surface in a xerographic development zone, shield means supported within the xerographic development zone intermediate the developable surface and said magnetic field producing means, shield means including a surface facing the developable surface capable of preventing the smooth sliding of magnetic developer there across and means to move said magnetic field producing means with respect to said shield means of that developer material entrained on the surface of said shield means will move across said shield means in a direction opposite from the direction of movement of said magnetic field producing means to thereby contact and develop the latent electrostatic images on the developable surface.
Claim 8
Dependent Claim
144 words
Apparatus for developing the developable surface of a member supporting latent electrostatic images with magnetic developer including first means adapted to create magnetic fields including spaced north and south faces supported for at least a portion of their extent adjacent a developable surface in a xerographic development zone, second means comprising a shield supported within the xerographic development zone intermediate the developable surface and said first means, said shield including a surface facing and developable surface being adapted to prohibit the smooth sliding of developer thereacross, and means to move one of said prior mentioned means in a first direction so that developer material magnetically entrained oN the surface of said shield will move along said shield in a direction opposite from the first direction while within the influence of the magnetic field to contact and develop latent electrostatic images on the developable surface.
Claim 9
Dependent Claim
144 words
Apparatus for developing the developable surface of a member supporting latent electrostatic images with magnetic developer including first means adapted to create magnetic fields including spaced north and south faces supported for at least a portion of their extent adjacent a developable surface in a xerographic development zone, second means comprising a shield supported within the xerographic development zone intermediate the developable surface and said first means, said shield including a surface facing and developable surface being adapted to prohibit the smooth sliding of developer thereacross, and means to move one of said prior mentioned means in a first direction so that developer material magnetically entrained oN the surface of said shield will move along said shield in a direction opposite from the first direction while within the influence of the magnetic field to contact and develop latent electrostatic images on the developable surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |