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US4325628A Expired / Lapsed US ⏱️ 0.0 years remaining

Cleaning device for an image forming apparatus

Assignee: Canon Inc
•
Filing: 1979-11-27
•
Granted: 1982-04-20
•
Expires: 1999-11-27
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Abstract

Abstract A cleaning device for an image forming apparatus, wherein a magnetic developer image formed on the surface of an endlessly moving image bearing member is transferred onto an image transfer member, which comprises: a cleaning device to remove the magnetic developer remaining on the surface of the image bearing member; a magnetic field forming source situated in the vicinity of the cleaning device to confine the magnetic developer; a magnetic developer absorbing device having a surface to lead the confined magnetic developer from the surface of the image bearing member to a position away from it; a separating and guiding device which separates the magnetic developer from the magnetic developer adsorbing device, and guides the same outside the confining magnetic field; and a developer conveying device which conveys the removed toner in the direction substantially orthogonal to the moving direction of the image bearing member at a position where the confining magnetic field does not extend substantially.

Inventors

  • 👤 Akiyoshi Torigai
  • 👤 Teruo Morikawa
  • 👤 Masaki Nakaoka
  • 👤 Shinji Murata
  • 👤 Yoshiaki Sone

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 00:36
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/0005; G03G21/0047; G03G2221/00; G03G2221/0005

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 122 words
A cleaning device for an image forming apparatus, wherein a magnetic developer image formed on the surface of an image bearing member is transferred onto an image transfer material, said device comprising: cleaning means to remove the magnetic developer remaining on the surface of the image bearing member after transfer; magnetic field generating means disposed in the vicinity of said cleaning means for trapping the magnetic developer removed from the image bearing member by said cleaning means, said magnetic field generating means including a magnetic roll for conveying said trapped developer, said roll having magnetic poles disposed therearound, and wherein said magnetic poles around said magnetic roll are disposed in a spiral form with respect to the axis of said magnetic roll.
Claim 2
Dependent Claim 122 words
A cleaning device for an image forming apparatus, wherein a magnetic developer image formed on the surface of an image bearing member is transferred onto an image transfer material, said device comprising: cleaning means to remove the magnetic developer remaining on the surface of the image bearing member after transfer; magnetic field generating means disposed in the vicinity of said cleaning means for trapping the magnetic developer removed from the image bearing member by said cleaning means, said magnetic field generating means including a magnetic roll for conveying said trapped developer, said roll having magnetic poles disposed therearound, and wherein said magnetic poles around said magnetic roll are disposed in a spiral form with respect to the axis of said magnetic roll.
Claim 3
Dependent Claim 86 words
A cleaning device for an image forming apparatus, wherein a magnetic developer image formed on the surface of an image bearing member is transferred onto an image transfer material, said device comprising: cleaning means to remove the magnetic developer remaining on the surface of the image bearing member after transfer; transfer means for conveying the developer removed by said cleaning means to a removed developer collecting zone, wherein said developer transfer means comprises a non-magnetic screw and a magnetic roll in the interior of said screw.
Claim 4
Dependent Claim 86 words
A cleaning device for an image forming apparatus, wherein a magnetic developer image formed on the surface of an image bearing member is transferred onto an image transfer material, said device comprising: cleaning means to remove the magnetic developer remaining on the surface of the image bearing member after transfer; transfer means for conveying the developer removed by said cleaning means to a removed developer collecting zone, wherein said developer transfer means comprises a non-magnetic screw and a magnetic roll in the interior of said screw.
Claim 5
Dependent Claim 27 words
The cleaning device as set forth in claim 2, wherein said developer transfer means upwardly conveys the developer which has been applied thereto by said cleaning means.
Claim 6
Dependent Claim 20 words
The cleaning device as set forth in claims 1 or 2, wherein said cleaning means is an elastic cleaning device.

References Cited (Backward Citations)

US3472695A Cited
US3660863A Cited
US4252433A Cited
US4181425A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-04-19 1985-10-19 1986-04-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-04-19 1989-10-19 1990-04-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-04-19 1993-10-19 1994-04-20 $7700.00 Window Closed / Lapsed

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