US4027960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transfer system for electrostatic reproduction machine
Assignee: Xerox Corp
•
Filing: 1975-08-06
•
Granted: 1977-06-07
•
Expires: 1995-08-06
Abstract
Abstract An improved transfer system for transferring a developed electrostatic image from a photoreceptor to a transfer member includes an electrically biased transfer roll, and a transfer corona generating device. Preferably, the corona generating device is an ultra-high field device. The transfer member is first fed between the photoreceptor and the transfer roll whereby transfer is initiated and the transfer member is electrostatically tacked to the photoreceptor, and then the transfer member moves beneath the transfer corona generating device whereby transfer is completed. The transfer roll applies a first charge to the transfer member, and the transfer corona generating device then applies a second but higher charge to the transfer member.
Inventors
- 👤 J. William Ladrigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:52
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; Y; Y10; Y10S; Y10S271/00; Y10S271/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
An improved transfer system for transferring a developed electrostatic image from a charged photoreceptor to a transfer member, the improvement comprising first means for pressing the transfer member into contact with the developed image while simultaneously applying a first charge to the transfer member of the same polarity as the charge on the photoreceptor and of a magnitude sufficient to both initiate transfer of the developed electrostatic image and electrostatically tack the transfer member to the photoreceptor, and second means for applying a second charge to the transfer member while the latter is electrostatically tacked to the photoreceptor, the second charge being of the same polarity as but of a greater magnitude than the first charge, whereby transfer of the developed electrostatic image is completed.
Claim 2
Dependent Claim
125 words
An improved transfer system for transferring a developed electrostatic image from a charged photoreceptor to a transfer member, the improvement comprising first means for pressing the transfer member into contact with the developed image while simultaneously applying a first charge to the transfer member of the same polarity as the charge on the photoreceptor and of a magnitude sufficient to both initiate transfer of the developed electrostatic image and electrostatically tack the transfer member to the photoreceptor, and second means for applying a second charge to the transfer member while the latter is electrostatically tacked to the photoreceptor, the second charge being of the same polarity as but of a greater magnitude than the first charge, whereby transfer of the developed electrostatic image is completed.
Claim 3
Dependent Claim
36 words
An improved transfer system according to claim 1, wherein the transfer member has a lead edge, and further including means for preventing the second charge from being applied to the lead edge of the transfer member.
Claim 4
Dependent Claim
48 words
An improved transfer system according to claim 2, in combination with means for applying a third charge to the transfer member subsequent to applying the second charge, the third charge being of a magnitude and polarity sufficient to lessen the electrostatic attraction between the photoreceptor and transfer member.
Claim 5
Dependent Claim
45 words
An improved transfer system according to claim 2, in combination with means for applying both a third charge to the lead edge of the transfer member and a fourth charge to the remainder of the transfer member subsequent to the application of the second charge.
Claim 6
Dependent Claim
123 words
An improved process for transferring a developed electrostatic image from a charged photoreceptor to a transfer member, the improvement comprising: a. pressing the transfer member into contact with the developed image while simultaneously applying a first charge to the transfer member of the same polarity as the charge on the photoreceptor, the first charge being sufficient to both initiate transfer of the developed electrostatic image and to electrostatially tack the transfer member to the photoreceptor; and then b. applying a second charge to the transfer member while the transfer member is electrostatically tacked to the photoreceptor, the second charge being of the same polarity as but of a greater magnitude than the first charge, whereby transfer of the developed electrostatic image is completed.
Claim 7
Dependent Claim
123 words
An improved process for transferring a developed electrostatic image from a charged photoreceptor to a transfer member, the improvement comprising: a. pressing the transfer member into contact with the developed image while simultaneously applying a first charge to the transfer member of the same polarity as the charge on the photoreceptor, the first charge being sufficient to both initiate transfer of the developed electrostatic image and to electrostatially tack the transfer member to the photoreceptor; and then b. applying a second charge to the transfer member while the transfer member is electrostatically tacked to the photoreceptor, the second charge being of the same polarity as but of a greater magnitude than the first charge, whereby transfer of the developed electrostatic image is completed.
Claim 8
Dependent Claim
116 words
An improved process for transferring a developed electrostatic image from a charged photoreceptor to a transfer member in contact with the developed image, the improvement comprising: a. applying a first charge to the transfer member of the same polarity as the charge on the photoreceptor, the first charge being sufficient to both initiate transfer of the developed electrostatic image and electrostatically tack the transfer member to the photoreceptor and then b. applying a second charge to the transfer member while the transfer member is electrostatically tacked to the photoreceptor, the second charge being of the same polarity as but of a greater magnitude than the first charge, whereby transfer of the developed electrostatic image is completed.
Claim 9
Dependent Claim
116 words
An improved process for transferring a developed electrostatic image from a charged photoreceptor to a transfer member in contact with the developed image, the improvement comprising: a. applying a first charge to the transfer member of the same polarity as the charge on the photoreceptor, the first charge being sufficient to both initiate transfer of the developed electrostatic image and electrostatically tack the transfer member to the photoreceptor and then b. applying a second charge to the transfer member while the transfer member is electrostatically tacked to the photoreceptor, the second charge being of the same polarity as but of a greater magnitude than the first charge, whereby transfer of the developed electrostatic image is completed.
References Cited (Backward Citations)
US3244083A
Cited
US3267840A
Cited
US3575502A
Cited
US3620615A
Cited
US3647292A
Cited
US3970381A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |