Patent US4380309A successfully refreshed from Google Patents.
US4380309A
Expired / Lapsed
US
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Developer supply device
Assignee: Canon Inc
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Filing: 1981-01-15
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Granted: 1983-04-19
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Expires: 2001-01-15
Abstract
Abstract A developer supply device for supplying developing apparatus with a developer consisting of a mixture of toner and carrier, is characterized in that when toner and carrier are supplied separately to the developing apparatus, a magnetic field is provided near a carrier storage device storing carrier therein and the supply of the carrier is controlled by the magnetic field.
Inventors
- 👤 Yuji Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:18
CPC Classifications
G; G01; G01F; G01F15/00; G01F15/005; G01F11/00; G01F11/28; G01F11/282; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0822; G03G15/0848; G03G15/0856; G03G15/0862; G03G15/0877; Y; Y10; Y10S; Y10S222/00; Y10S222/01
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
126 words
A developer supply device for supplying a developing device with developer consisting of a mixture of toner and carrier, said developer supply device having: toner supply means for supplying toner; carrier supply means having a supply port for supplying carrier; magnetic field forming means provided near the carrier supply port of said carrier supply means and including an electromagnet and a permanent magnet disposed in opposed relation therewith; and means for controlling the intensity of a magnetic field imparted to the supply port of said carrier supply means by said magnetic field forming means, the intensity of the magnetic field being varied by said control means so that the passage of the carrier through said carrier supply port and prevention of said passage are selectively effected.
Claim 2
Dependent Claim
126 words
A developer supply device for supplying a developing device with developer consisting of a mixture of toner and carrier, said developer supply device having: toner supply means for supplying toner; carrier supply means having a supply port for supplying carrier; magnetic field forming means provided near the carrier supply port of said carrier supply means and including an electromagnet and a permanent magnet disposed in opposed relation therewith; and means for controlling the intensity of a magnetic field imparted to the supply port of said carrier supply means by said magnetic field forming means, the intensity of the magnetic field being varied by said control means so that the passage of the carrier through said carrier supply port and prevention of said passage are selectively effected.
Claim 3
Dependent Claim
27 words
A device according to claim 1, wherein two of said magnetic field forming means are juxtaposed relative to said carrier supply means with a predetermined distance therebetween.
Claim 4
Dependent Claim
22 words
A device according to claim 1, wherein said permanent magnet is adjustable in its position with respect to said carrier supply port.
Claim 5
Dependent Claim
16 words
A device according to claim 1, wherein said carrier supply means is of a funnel shape.
Claim 6
Dependent Claim
126 words
A developer supply device for supplying a developing device with developer consisting of a mixture of toner and carrier, said developer supply device having: toner supply means for supplying toner; carrier supply means having a supply port for supplying carrier; magnetic field forming means provided near the carrier supply port of said carrier supply means; means for controlling the intensity of a magnetic field imparted to the supply port of said carrier supply means by said magnetic field forming means, the intensity of the magnetic field being varied by said control means so that the passage of the carrier through said carrier supply port and prevention of said passage are selectively effected; and detector means for detecting the presence of the carrier in said supply means.
Claim 7
Dependent Claim
126 words
A developer supply device for supplying a developing device with developer consisting of a mixture of toner and carrier, said developer supply device having: toner supply means for supplying toner; carrier supply means having a supply port for supplying carrier; magnetic field forming means provided near the carrier supply port of said carrier supply means; means for controlling the intensity of a magnetic field imparted to the supply port of said carrier supply means by said magnetic field forming means, the intensity of the magnetic field being varied by said control means so that the passage of the carrier through said carrier supply port and prevention of said passage are selectively effected; and detector means for detecting the presence of the carrier in said supply means.
Claim 8
Dependent Claim
14 words
A device according to claim 5, wherein two of said detector means are provided.
Claim 9
Dependent Claim
16 words
A device according to claim 6 or 5, wherein said detector means is optical detector means.
Claim 10
Dependent Claim
35 words
A device according to claim 2, further having two detector means for detecting the presence of the carrier and wherein one of said two detector means is disposed between said two magnetic field forming means.
Claim 11
Dependent Claim
26 words
A device according to claim 8 or 5, further having means for changing the sense timing of said detector means to effect confirmation of carrier supply.
Claim 12
Dependent Claim
31 words
A device according to claim 8 or 5, further having means for changing the sense timing of said detector means to effect the confirmation that said carrier supply means is empty.
Claim 13
Dependent Claim
27 words
A device according to claim 8, further having means for changing the sense timing of said dectector means to effect detection of abnormality of said detector means.
Claim 14
Dependent Claim
21 words
A device according to claim 6 or 5, further having a display device for displaying the result of said detector means.
Claim 15
Dependent Claim
100 words
A developer supply device for supplying developer to a developing device, having: storage means formed with a supply portion for storing the developer therein; magnetic field forming means provided near the supply portion of said developer storage means and including an electromagnet and a permanent magnet disposed in opposed relation therewith; and means for controlling the intensity of a magnetic field imparted to the developer supply portion by said magnetic field forming means, the intensity of the magnetic field being varied by said control means so that the passage and stagnation of the developer in the supply portion are controlled.
Claim 16
Dependent Claim
100 words
A developer supply device for supplying developer to a developing device, having: storage means formed with a supply portion for storing the developer therein; magnetic field forming means provided near the supply portion of said developer storage means and including an electromagnet and a permanent magnet disposed in opposed relation therewith; and means for controlling the intensity of a magnetic field imparted to the developer supply portion by said magnetic field forming means, the intensity of the magnetic field being varied by said control means so that the passage and stagnation of the developer in the supply portion are controlled.
Claim 17
Dependent Claim
13 words
A device according to claim 13, wherein said developer consists of carrier alone.
Claim 18
Dependent Claim
13 words
A device according to claim 13, wherein said developer is a magnetic toner.
References Cited (Backward Citations)
US3026406A
Cited
US3999687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-18 | 1986-10-18 | 1987-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-18 | 1990-10-18 | 1991-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-18 | 1994-10-18 | 1995-04-19 | $7700.00 | Window Closed / Lapsed |