US4026242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matrix supporting device in electrostatic development apparatus
Assignee: GRATOSOL Srl
•
Filing: 1975-06-02
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Granted: 1977-05-31
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Expires: 1995-06-02
Abstract
Abstract A matrix supporting device in electrostatic developing apparatus, wherein the matrix is moved to a position in front of the magnetic developing roller while adhering to a rotable cylindrical surface, the axis of rotation of which is at a fixed spacing from that of the roller.
Inventors
- 👤 Vittorio Boschet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6529; G03G15/06; G03G15/08; G03G15/09
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A matrix supporting device in an electrostatic developing apparatus, comprising: a magnetic developing roller for applying toner to the exposed surface of said matrix: means defining a rotatable cylindrical surface; and means for spacing the axis of rotation of said cylindrical surface at a fixed spacing from that of said roller; and wherein said means defining a rotatable cylindrical surface includes: a cylindrical skirt portion for receiving said matrix; and a pair of rocker clamps for releasably clamping the leading and trailing edges of said matrix at the outer circumferentially spaced edges of said skirt portion; and said device further comprising: means for pressing said matrix against said cylindrical skirt; and means for stepping said pressing means over said clamps as said skirt rotates.
Claim 2
Dependent Claim
124 words
A matrix supporting device in an electrostatic developing apparatus, comprising: a magnetic developing roller for applying toner to the exposed surface of said matrix: means defining a rotatable cylindrical surface; and means for spacing the axis of rotation of said cylindrical surface at a fixed spacing from that of said roller; and wherein said means defining a rotatable cylindrical surface includes: a cylindrical skirt portion for receiving said matrix; and a pair of rocker clamps for releasably clamping the leading and trailing edges of said matrix at the outer circumferentially spaced edges of said skirt portion; and said device further comprising: means for pressing said matrix against said cylindrical skirt; and means for stepping said pressing means over said clamps as said skirt rotates.
Claim 3
Dependent Claim
31 words
A device as claimed in claim 1, wherein said means defining a rotatable cylindrical surface is a cylindrical drum having a disc shaped head closing each end of said cylindrical surface.
Claim 4
Dependent Claim
29 words
A device as set forth in claim 1, wherein said skirt portion and heads are coated with an insulating material, except for an intermediate skirt strip which is specular.
Claim 5
Dependent Claim
17 words
A device as set forth in claim 1, wherein said clamps are coated with an insulating material.
Claim 6
Dependent Claim
19 words
A device as set forth in claim 1, wherein the movement of said clamps is controlled by cam means.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |