US4473028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing device
Assignee: Konica Minolta Inc
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Filing: 1982-07-28
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Granted: 1984-09-25
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Expires: 2002-07-28
Abstract
Abstract A developing device for use in an electrophotographic copying machine or electrostatic recording apparatus includes a stirring blade for mixing the developer. The driven shaft driving the stirring blade is intermittently revolved in a reverse direction to the main driving shaft directly connected to the developing sleeve by a mechanism incorporated between the main shaft and the driven shaft.
Inventors
- 👤 Kunio Ito
- 👤 Ken Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:07
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0822
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
In a developing device in which a developer is frictionally charged and is unified by a stirring blade, said developing device comprising a main driving shaft driven by a driving power source, a stirring blade for stirring the developer, a driven shaft driving said stirring blade, and a mechanism incorporated in between said main driving shaft and said driven shaft so as to intermittently revolve the driven shaft in the reverse direction to the main driving shaft.
Claim 2
Dependent Claim
77 words
In a developing device in which a developer is frictionally charged and is unified by a stirring blade, said developing device comprising a main driving shaft driven by a driving power source, a stirring blade for stirring the developer, a driven shaft driving said stirring blade, and a mechanism incorporated in between said main driving shaft and said driven shaft so as to intermittently revolve the driven shaft in the reverse direction to the main driving shaft.
Claim 3
Dependent Claim
17 words
A developing device according to claim 1, wherein said device comprises a plurality of the stirring blades.
Claim 4
Dependent Claim
59 words
A developing device according to claim 1 or 2, wherein said mechanism comprises a driven pinion fixed to said driven shaft, a sectorial driving gear and a sectorial reversing gear fixed so as to be adjacently juxtaposed in the axial direction, and a counter gear constantly engaged with the driven shaft and intermittently engaging with the sectorial driving gear.
Claim 5
Dependent Claim
28 words
A developing device according to claim 1 or 2, wherein said mechanism comprises a flat spiral spring fixed to said driven shaft at one end of said spring.
Claim 6
Dependent Claim
22 words
A developing device according to claim 4, wherein said mechanism further comprises a holder fixed to the other end of said spring.
Claim 7
Dependent Claim
24 words
A developing device according to claim 1 or 2, wherein said main driving shaft is arranged as a rotating shaft of a developing sleeve.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |