Patent US4755853A successfully refreshed from Google Patents.
US4755853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning device
Assignee: Casio Computer Co Ltd
•
Filing: 1985-09-13
•
Granted: 1988-07-05
•
Expires: 2005-09-13
Abstract
Abstract The present invention relates to a cleaning apparatus for use in a photocopying apparatus. The cleaning device comprises a grounded conductive fur brush for removing residual toners on a photosensitive drum and a conductive retrieval roll for retrieving the toners caught in the fur brush, a predetermined bias voltage being applied to conductive retrieval roll. The cleaning device further includes a scraping means for scraping the toner transferred to said conductive retrieval roll.
Inventors
- 👤 Shigeru Shimizu
- 👤 Masaaki Dohi
- 👤 Yoji Kuriyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:27
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/0005; G03G21/0035; G03G21/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
95 words
A cleaning apparatus comprising a conductive fur brush and means for directly grounding said fur brush, said brush comprising a conductive material having a resistivity of 10 7 -10 10 ohm-cm. for removing residual toner from an image bearing member, said cleaning apparatus further comprising a conductive retrieval roll and means for applying a predetermined bias voltage to said roll, said conductive retrieval roll comprising means for retrieving toner caught in said fur brush, said apparatus further comprising means for scraping toner which has been transferred to said conductive retrieval roll from said retrieval roll.
Claim 2
Dependent Claim
95 words
A cleaning apparatus comprising a conductive fur brush and means for directly grounding said fur brush, said brush comprising a conductive material having a resistivity of 10 7 -10 10 ohm-cm. for removing residual toner from an image bearing member, said cleaning apparatus further comprising a conductive retrieval roll and means for applying a predetermined bias voltage to said roll, said conductive retrieval roll comprising means for retrieving toner caught in said fur brush, said apparatus further comprising means for scraping toner which has been transferred to said conductive retrieval roll from said retrieval roll.
Claim 3
Dependent Claim
29 words
A cleaning apparatus in accordance with claim 1 wherein said conductive fur brush has a resistance of 10 6 -10 8 ohms when said conductive fur brush is rotated.
Claim 4
Dependent Claim
23 words
A cleaning apparatus in accordance with either of claims 1 or 2 wherein said conductive material forming said conductive fur brush is hydrophobic.
Claim 5
Dependent Claim
188 words
A cleaning apparatus comprising a conductive fur brush grounded through a predetermined resistance, said apparatus further comprising means for applying a bias voltage to said brush, said bias voltage having a polarity which is opposite to the polarity of the bias voltage of electrostatically charged toner remaining on an image bearing member, said conductive fur brush thereby comprising means for removing said toner from said image bearing member, said cleaning apparatus further comprising a conductive retrieval roll and means for applying a bias voltage to said conductive retrieval roll of a polarity opposite to the polarity of said electrostatically charged toner removed from said image bearing member, said conductive retrieval roll thereby comprising means for retrieving toner caught in said fur brush, and means for scraping toner transferred to said conductive retrieval roll, wherein the bias voltage applied to said conductive fur brush has an absolute value of less than 200 volts and the absolute value of the bias voltage applied to said conductive retrieval roll is greater than the absolute value of the bias voltage applied to said conductive fur brush by between 200 and 500 volts.
Claim 6
Dependent Claim
188 words
A cleaning apparatus comprising a conductive fur brush grounded through a predetermined resistance, said apparatus further comprising means for applying a bias voltage to said brush, said bias voltage having a polarity which is opposite to the polarity of the bias voltage of electrostatically charged toner remaining on an image bearing member, said conductive fur brush thereby comprising means for removing said toner from said image bearing member, said cleaning apparatus further comprising a conductive retrieval roll and means for applying a bias voltage to said conductive retrieval roll of a polarity opposite to the polarity of said electrostatically charged toner removed from said image bearing member, said conductive retrieval roll thereby comprising means for retrieving toner caught in said fur brush, and means for scraping toner transferred to said conductive retrieval roll, wherein the bias voltage applied to said conductive fur brush has an absolute value of less than 200 volts and the absolute value of the bias voltage applied to said conductive retrieval roll is greater than the absolute value of the bias voltage applied to said conductive fur brush by between 200 and 500 volts.
Claim 7
Dependent Claim
155 words
A cleaning apparatus comprising a conductive fur brush grounded through a predetermined resistance, said apparatus further comprising means for applying a bias voltage to said brush, said bias voltage having a polarity which is opposite to the polarity of the bias voltage of electrostatically charged toner remaining on an image bearing member, said conductive fur brush thereby comprising means for removing said toner from said image bearing member, said cleaning apparatus further comprising a conductive retrieval roll and means for applying a bias voltage to said conductive retrieval roll of a polarity opposite to the polarity of said electrostatically charged toner removed from said image bearing member, said conductive retrieval roll thereby comprising means for retrieving toner caught in said fur brush, and means for scraping toner transferred to said conductive retrieval roll, wherein the resistance connected to said conductive fur brush has a value lower than the resistance of said rotating conductive fur brush.
Claim 8
Dependent Claim
155 words
A cleaning apparatus comprising a conductive fur brush grounded through a predetermined resistance, said apparatus further comprising means for applying a bias voltage to said brush, said bias voltage having a polarity which is opposite to the polarity of the bias voltage of electrostatically charged toner remaining on an image bearing member, said conductive fur brush thereby comprising means for removing said toner from said image bearing member, said cleaning apparatus further comprising a conductive retrieval roll and means for applying a bias voltage to said conductive retrieval roll of a polarity opposite to the polarity of said electrostatically charged toner removed from said image bearing member, said conductive retrieval roll thereby comprising means for retrieving toner caught in said fur brush, and means for scraping toner transferred to said conductive retrieval roll, wherein the resistance connected to said conductive fur brush has a value lower than the resistance of said rotating conductive fur brush.
Claim 9
Dependent Claim
30 words
A cleaning apparatus in accordance with claim 4 wherein the resistance connected to said conductive fur brush has a value lower than the resistance of said rotating conductive fur brush.
Claim 10
Dependent Claim
30 words
A cleaning apparatus in accordance with any one of claims 4, 5 or 6, said conductive fur brush comprising conductive material having a resistivity of 10 7 -10 10 ohms-cm.
Claim 11
Dependent Claim
34 words
A cleaning apparatus in accordance with any one of claims 4, 5 or 6, said conductive fur brush having a resistance of 10 6 -10 8 ohms when said conductive fur brush is rotated.
Claim 12
Dependent Claim
18 words
A cleaning apparatus in accordance with claim 8 wherein said conductive fur brush comprises a hydrophobic conductive material.
Claim 13
Dependent Claim
18 words
A cleaning apparatus in accordance with claim 7 wherein said conductive fur brush comprises a hydrophobic conductive material.
Claim 14
Dependent Claim
16 words
A cleaning apparatus in accordance with claim 8 wherein said conductive fur brush comprises conductive rayon.
Claim 15
Dependent Claim
16 words
A cleaning apparatus in accordance with claim 9 wherein said conductive fur brush comprises conductive rayon.
Claim 16
Dependent Claim
153 words
A cleaning apparatus comprising a conductive fur brush grounded through a predetermined resistance, said apparatus further comprising means for applying a bias voltage to said brush, said bias voltage having a polarity which is opposite to the polarity of the bias voltage of electrostatically charged toner remaining on an image bearing member, said conductive fur brush thereby comprising means for removing said toner from said image bearing member, said cleaning apparatus further comprising a conductive retrieval roll and means for applying a bias voltage to said conductive retrieval roll of a polarity opposite to the polarity of said electrostatically charged toner removed from said image bearing member, said conductive retrieval roll thereby comprising means for retrieving toner caught in said fur brush, and means for scraping toner transferred to said conductive retrieval roll, said conductive fur brush having a resistance of 10 6 -10 8 ohms when said conductive fur brush is rotated.
Claim 17
Dependent Claim
153 words
A cleaning apparatus comprising a conductive fur brush grounded through a predetermined resistance, said apparatus further comprising means for applying a bias voltage to said brush, said bias voltage having a polarity which is opposite to the polarity of the bias voltage of electrostatically charged toner remaining on an image bearing member, said conductive fur brush thereby comprising means for removing said toner from said image bearing member, said cleaning apparatus further comprising a conductive retrieval roll and means for applying a bias voltage to said conductive retrieval roll of a polarity opposite to the polarity of said electrostatically charged toner removed from said image bearing member, said conductive retrieval roll thereby comprising means for retrieving toner caught in said fur brush, and means for scraping toner transferred to said conductive retrieval roll, said conductive fur brush having a resistance of 10 6 -10 8 ohms when said conductive fur brush is rotated.
Claim 18
Dependent Claim
145 words
A cleaning apparatus comprising a conductive fur brush grounded to a predetermined resistance, said apparatus further comprising means for applying a bias voltage to said brush, said bias voltage having a polarity which is opposite to the polarity of the bias voltage of electrostatically charged toner remaining on an image bearing member, said conductive fur brush thereby comprising means for removing said toner from said cleaning apparatus further comprising a conductive retrieval roll and means for applying a bias voltage to said conductive retrieval roll of a polarity opposite to the polarity of said electrostatically charged toner removed from said image bearing member, said conductive retrieval roll thereby comprising means for retrieving toner caught in said fur brush, and means for scraping toner transferred to said conductive retrieval roll, said conductive fur brush comprising conductive material having a resistivity of 10 7 -10 10 ohms-cm.
Claim 19
Dependent Claim
145 words
A cleaning apparatus comprising a conductive fur brush grounded to a predetermined resistance, said apparatus further comprising means for applying a bias voltage to said brush, said bias voltage having a polarity which is opposite to the polarity of the bias voltage of electrostatically charged toner remaining on an image bearing member, said conductive fur brush thereby comprising means for removing said toner from said cleaning apparatus further comprising a conductive retrieval roll and means for applying a bias voltage to said conductive retrieval roll of a polarity opposite to the polarity of said electrostatically charged toner removed from said image bearing member, said conductive retrieval roll thereby comprising means for retrieving toner caught in said fur brush, and means for scraping toner transferred to said conductive retrieval roll, said conductive fur brush comprising conductive material having a resistivity of 10 7 -10 10 ohms-cm.
References Cited (Backward Citations)
US3580673A
Cited
US4361922A
Cited
US4451139A
Cited
US4482244A
Cited
US4506975A
Cited
US4515467A
Cited
US4533236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |