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US3854449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development apparatus
Assignee: Xerox Corp
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Filing: 1972-05-22
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Granted: 1974-12-17
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Expires: 1992-05-22
Abstract
Abstract An apparatus for developing an electrostatic latent image. The apparatus is moved from an inoperative position spaced from the latent image to a position in operative communication therewith. After the latent image is developed, the apparatus is moved to the inoperative position thereof.
Inventors
- 👤 J Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:39
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
An apparatus for rendering visible an electrostatic latent image, including: a housing having a chamber therein for storing particles; means, mounted for movement in unison with said housing, for depositing particles onto the latent image; means for advancing the particles from the storage chamber of said housing to said depositing means; and means, responsive to the latent image advancing to a first predetermined location, for moving automatically said housing from an inoperative position where said depositing means is spaced from the latent image to an operative position where said depositing means is closely adjacent to the latent image in operative communication therewith, said moving means in response to the latent image advancing to a second predetermined location after particles have been deposited thereon, returning automatically said housing from the operative position to the inoperative position.
Claim 2
Independent Claim
135 words
An apparatus for rendering visible an electrostatic latent image, including: a housing having a chamber therein for storing particles; means, mounted for movement in unison with said housing, for depositing particles onto the latent image; means for advancing the particles from the storage chamber of said housing to said depositing means; and means, responsive to the latent image advancing to a first predetermined location, for moving automatically said housing from an inoperative position where said depositing means is spaced from the latent image to an operative position where said depositing means is closely adjacent to the latent image in operative communication therewith, said moving means in response to the latent image advancing to a second predetermined location after particles have been deposited thereon, returning automatically said housing from the operative position to the inoperative position.
Claim 3
Independent Claim
182 words
An apparatus for rendering visible an electrostatic latent image, including: a developer housing defining a chamber storing a developer mix comprising carrier granules and toner particles; means for advancing the developer mix from a first region to a second region for discharge thereat; rotary driven developer means mounted within the chamber of said developer housing closely proximate to said advancing means for receiving the developer mix therefrom, and arranged to deposit toner particles onto the latent image when in operative communication therewith; means for driving said advancing means such that the reaction torque to the driving moment applied to said advancing means pivots said developer housing disposing said developer means adjacent the latent image in operative communication therewith; means for actuating said driving means in response to the latent image advancing to a predetermined location, whereby said developer means moves from an inoperative position spaced from the latent image to a position adjacent thereto in operative communication therewith; and means for moving said developer means from the position adjacent the latent image in operative communication therewith to the inoperative position spaced therefrom.
Claim 4
Independent Claim
182 words
An apparatus for rendering visible an electrostatic latent image, including: a developer housing defining a chamber storing a developer mix comprising carrier granules and toner particles; means for advancing the developer mix from a first region to a second region for discharge thereat; rotary driven developer means mounted within the chamber of said developer housing closely proximate to said advancing means for receiving the developer mix therefrom, and arranged to deposit toner particles onto the latent image when in operative communication therewith; means for driving said advancing means such that the reaction torque to the driving moment applied to said advancing means pivots said developer housing disposing said developer means adjacent the latent image in operative communication therewith; means for actuating said driving means in response to the latent image advancing to a predetermined location, whereby said developer means moves from an inoperative position spaced from the latent image to a position adjacent thereto in operative communication therewith; and means for moving said developer means from the position adjacent the latent image in operative communication therewith to the inoperative position spaced therefrom.
Claim 5
Dependent Claim
29 words
Apparatus as recited in claim 2, wherein said moving means includes biasing means for resiliently urging said toner depositing means from the operative position to the inoperative position thereof.
Claim 6
Dependent Claim
69 words
Apparatus as recited in claim 2, wherein said advancing means includes: conveyor means mounted for movement within the chamber of said developer housing, and arranged to move the developer mix from a first region to an intermediate region; and rotary driven transport means mounted within the chamber of said developer housing, and arranged to move the developer mix from the intermediate region to the second region for discharge thereat.
Claim 7
Dependent Claim
84 words
Apparatus as recited in claim 4, wherein: said transport means includes a first tubular member of non-magnetic material, said first magnetic means fixedly disposed within said first tubular member for creating a magnetic field in the path of the periphery of said first tubular member; and said developer means includes a second tubular member of non-magnetic material, and second magnetic means fixedly disposed within said second tubular member for creating a magnetic field in the path of the periphery of said second tubular member.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |