Patent US5115280A successfully refreshed from Google Patents.
US5115280A
Expired / Lapsed
US
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Residual toner cleaning apparatus for color image forming device
Assignee: Konica Minolta Inc
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Filing: 1991-02-12
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Granted: 1992-05-19
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Expires: 2011-02-12
Abstract
Abstract The present invention relates to a color copying apparatus which prevents toner scattering from a tip portion of a cleaner to an image area of an image carrying drum. An exposing device forms a stripe latent image in a stripe area at an upstream of the image area of an image carrying drum in a rotating direction of the image carrying drum, and a developing device stops development within the stripe area. The result is a generation of a sharp potential gap in the stripe area. The cleaner starts cleaning by touching to the stripe area, and accumulated toner on the tip of the cleaner is attracted by the sharp potential gap and is held within the stripe area. This prevents the toner from being scattered to the image area of the image carrying drum.
Inventors
- 👤 Jun-ichi Hamada
- 👤 Yukio Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:00
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/0005; G03G15/00; G03G15/01; G03G15/0105
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
223 words
An apparatus for forming a color image, comprising: a rotatable image carrying member having an image area for carrying a latent image corresponding to the color image; means for forming the latent image in the image area and a stripe latent image other than in the image area, the stripe latent image being formed at an upstream side of the image area with respect to a rotation of the image carrying member; means for developing the latent image with a plurality of different color toners to form a color image composed of a plurality of toner images on the image carrying member, each of the toner images corresponding to the different color toners; wherein a latent image formation and a development are repeated by the latent image forming means and the developing means during a plurality of the rotation of the image carrying member so as to form the color image; means for transferring the color image onto a transfer sheet; means for cleaning residual toner from the image carrying member; and means for abutting the cleaning means to the surface of the image carrying member so that the stripe latent image attracts the toner from the cleaning means after the transferring, wherein the abutting means releases the cleaning means from the image carrying member so as not to deteriorate the toner image.
Claim 2
Independent Claim
223 words
An apparatus for forming a color image, comprising: a rotatable image carrying member having an image area for carrying a latent image corresponding to the color image; means for forming the latent image in the image area and a stripe latent image other than in the image area, the stripe latent image being formed at an upstream side of the image area with respect to a rotation of the image carrying member; means for developing the latent image with a plurality of different color toners to form a color image composed of a plurality of toner images on the image carrying member, each of the toner images corresponding to the different color toners; wherein a latent image formation and a development are repeated by the latent image forming means and the developing means during a plurality of the rotation of the image carrying member so as to form the color image; means for transferring the color image onto a transfer sheet; means for cleaning residual toner from the image carrying member; and means for abutting the cleaning means to the surface of the image carrying member so that the stripe latent image attracts the toner from the cleaning means after the transferring, wherein the abutting means releases the cleaning means from the image carrying member so as not to deteriorate the toner image.
Claim 3
Dependent Claim
24 words
The apparatus of claim 1, wherein the developing means forms a color image composed of the plurality of the color images by reversal development.
Claim 4
Dependent Claim
24 words
The apparatus of claim 1, wherein the stripe latent image is formed before a final color latent image is formed at the image area.
Claim 5
Independent Claim
143 words
An apparatus for forming a color image, comprising: a rotatable image carrying member having an image area; means for forming a plurality of latent images corresponding to an original image in the image area of the rotatable image carrying member; means for developing a color image in the image area by superimposing a plurality of color toner images, each of said color toner images being developed from each of said latent images; means for transferring the color image from the image area of the image carrying member to a recording sheet; means for feeding the recording sheet to the transferring means, which starts feeding at a feed time; means for varying the feed time; and means for cleaning the image area of the image carrying member, which retracts from the image area to stop cleaning after a predetermined time from the feed time.
Claim 6
Independent Claim
143 words
An apparatus for forming a color image, comprising: a rotatable image carrying member having an image area; means for forming a plurality of latent images corresponding to an original image in the image area of the rotatable image carrying member; means for developing a color image in the image area by superimposing a plurality of color toner images, each of said color toner images being developed from each of said latent images; means for transferring the color image from the image area of the image carrying member to a recording sheet; means for feeding the recording sheet to the transferring means, which starts feeding at a feed time; means for varying the feed time; and means for cleaning the image area of the image carrying member, which retracts from the image area to stop cleaning after a predetermined time from the feed time.
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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) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |