US3870515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for electrostatic paper stripping by neutralization of transfer charge
Assignee: Xerox Corp
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Filing: 1974-01-15
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Granted: 1975-03-11
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Expires: 1994-01-15
Abstract
Abstract A method for stripping copy sheets, which are electrostatically supporting toner images, away from an original support surface from which the toner images have been transferred to the copy sheets. The stripping is achieved through the neutralization of the electrostatic charge in the copy sheets which holds them to the surface.
Inventors
- 👤 Norbett H Kaupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:10
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6532; G03G15/6535
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
119 words
A method of producing xerographic copy including the steps of forming on a member a developable latent electrostatic image having an electrical charge pattern of image and non-image areas, developing the image on the member with charged toner particles, moving an insulating backing sheet into contact with the surface of the member in registration with the developed image, electrostatically transferring the toner particles to the insulating backing sheet with direct Current ion emissions opposite in polarity from the charge on the toner particles, and subjecting the sheet with toner images to alternating ion emissions from an ion emitting device spaced therefrom to substantially eliminate the eletrostatic bond between the backing sheet and the member created by the electrostatic transferring.
Claim 2
Independent Claim
119 words
A method of producing xerographic copy including the steps of forming on a member a developable latent electrostatic image having an electrical charge pattern of image and non-image areas, developing the image on the member with charged toner particles, moving an insulating backing sheet into contact with the surface of the member in registration with the developed image, electrostatically transferring the toner particles to the insulating backing sheet with direct Current ion emissions opposite in polarity from the charge on the toner particles, and subjecting the sheet with toner images to alternating ion emissions from an ion emitting device spaced therefrom to substantially eliminate the eletrostatic bond between the backing sheet and the member created by the electrostatic transferring.
Claim 3
Dependent Claim
43 words
The method as set forth in claim 1 wherein the subjecting of the sheet is accomplished with a corotron emitting both positive and negative ion emissions but with an excess of emissions of the polarity the same as that on the toner particles.
Claim 4
Dependent Claim
30 words
The method as set forth in claim 1 wherein the subjecting of the sheet is accomplished with a corotron having an alternate current power source with a direct current bias.
Claim 5
Dependent Claim
143 words
In the method of producing xerographic copy which includes the steps of charging a cylindrically shaped photoconductive member with an electrostatic charge, exposing the charged member to dissipate the charge in a patterned configuration of image and non-image areas corresponding to an object to be reproduced, developing the surface of the exposed member with charged toner particles to create a toner image, moving the leading edge of an insulating backing sheet into contact with the surface of the photoconductive member so that the sheet is in registration with the toner image and electrostatically transferring the toner particles to the insulating backing sheet with emissions of a single polarity the improvement comprising, subjecting the sheet with the toner image thereon to ion emission of alternating polarity to thereby decrease the electrostatic bond between the backing sheet and photoconductive member created by the electrostatic transfer.
Claim 6
Dependent Claim
143 words
In the method of producing xerographic copy which includes the steps of charging a cylindrically shaped photoconductive member with an electrostatic charge, exposing the charged member to dissipate the charge in a patterned configuration of image and non-image areas corresponding to an object to be reproduced, developing the surface of the exposed member with charged toner particles to create a toner image, moving the leading edge of an insulating backing sheet into contact with the surface of the photoconductive member so that the sheet is in registration with the toner image and electrostatically transferring the toner particles to the insulating backing sheet with emissions of a single polarity the improvement comprising, subjecting the sheet with the toner image thereon to ion emission of alternating polarity to thereby decrease the electrostatic bond between the backing sheet and photoconductive member created by the electrostatic transfer.
Claim 7
Dependent Claim
138 words
In the method of producing xerographic copy which includes the step of forming a developable latent electrostatic image on a member, developing the surface of the member with charged toner particles of a first polarity to create toner images, sequentially moving insulating backing sheets into contact with the surface of the member in registration with the toner images thereon and electrostatically transferring the toner particles to the insulating backing sheet with direct current ion emissions, the improvement comprising, subjecting the sheets with toner images thereon to corotron emissions of alternating polarity with the majority of emissions being of the same polarity as the charge on the toner particles to thereby decrease the electrostatic bond between the backing sheets and member created by the electrostatic transfer to thereby permit the toner bearing backing sheet to fall from the member.
Claim 8
Dependent Claim
138 words
In the method of producing xerographic copy which includes the step of forming a developable latent electrostatic image on a member, developing the surface of the member with charged toner particles of a first polarity to create toner images, sequentially moving insulating backing sheets into contact with the surface of the member in registration with the toner images thereon and electrostatically transferring the toner particles to the insulating backing sheet with direct current ion emissions, the improvement comprising, subjecting the sheets with toner images thereon to corotron emissions of alternating polarity with the majority of emissions being of the same polarity as the charge on the toner particles to thereby decrease the electrostatic bond between the backing sheets and member created by the electrostatic transfer to thereby permit the toner bearing backing sheet to fall from the member.
Claim 9
Independent Claim
195 words
A method of transferring charged xerographic toner images from a developed latent electrostatic image-bearing member to insulating backing sheets, and of stripping the toner-bearing backing sheet from the member including, sequentially feeding insulating backing sheets into contact with the developed member with the leading edge of each sheet in registration with the leading edge of a developed latent electrostatic image, bringing the member and sequentially fed backing sheets into the influence of electrostatic means positioned on the side of the insulating backing sheets remote from the member to charge the backing sheets with a charge having a polarity opposite from the charge on the toner particles to thereby electrostatically attach toner images to the backing sheets and electrostatically tack the backing sheets to the member, then bringing the member and sequentially fed backing sheets into the influence of an alternating current corotron means positioned on the side of the insulating backing sheets remote from the member to subject the insulating backing sheets to alternating corona emissions to thereby minimize the electrostatic bond between the toner-bearing sheets and the member and, catching the toner-bearing backing sheets with sheet feed means as they separate from the member.
Claim 10
Independent Claim
195 words
A method of transferring charged xerographic toner images from a developed latent electrostatic image-bearing member to insulating backing sheets, and of stripping the toner-bearing backing sheet from the member including, sequentially feeding insulating backing sheets into contact with the developed member with the leading edge of each sheet in registration with the leading edge of a developed latent electrostatic image, bringing the member and sequentially fed backing sheets into the influence of electrostatic means positioned on the side of the insulating backing sheets remote from the member to charge the backing sheets with a charge having a polarity opposite from the charge on the toner particles to thereby electrostatically attach toner images to the backing sheets and electrostatically tack the backing sheets to the member, then bringing the member and sequentially fed backing sheets into the influence of an alternating current corotron means positioned on the side of the insulating backing sheets remote from the member to subject the insulating backing sheets to alternating corona emissions to thereby minimize the electrostatic bond between the toner-bearing sheets and the member and, catching the toner-bearing backing sheets with sheet feed means as they separate from the member.
Claim 11
Independent Claim
198 words
A method of transferring charged xerographic tonEr images from a developed latent electrostatic image-bearing member to insulating backing sheets, and of stripping the toner-bearing backing sheet from the member including, sequentially feeding insulating backing sheets into contact with the developed member with the leading edge of each sheet in registration with the leading edge of a developed latent electrostatic image, bringing the member and sequentially fed backing sheets into the influence of a direct current corotron means positioned on the side of the insulating backing sheets remote from the member to charge the backing sheets with corona emissions having a polarity opposite from the charge on the toner particles to thereby electrostatically attach toner images to the backing sheets and electrostatically tack the backing sheets to the member, then bringing the member and sequentially fed backing sheets into the influence of an alternating current corotron means positioned on the side of the insulating backing sheets remote from the member to subject the insulating backing sheets to alternating corona emissions to thereby minimize the electrostatic bond between the toner-bearing sheets and the member and, catching the toner-bearing backing sheets with sheet feed means as they separate from the member.
Claim 12
Independent Claim
198 words
A method of transferring charged xerographic tonEr images from a developed latent electrostatic image-bearing member to insulating backing sheets, and of stripping the toner-bearing backing sheet from the member including, sequentially feeding insulating backing sheets into contact with the developed member with the leading edge of each sheet in registration with the leading edge of a developed latent electrostatic image, bringing the member and sequentially fed backing sheets into the influence of a direct current corotron means positioned on the side of the insulating backing sheets remote from the member to charge the backing sheets with corona emissions having a polarity opposite from the charge on the toner particles to thereby electrostatically attach toner images to the backing sheets and electrostatically tack the backing sheets to the member, then bringing the member and sequentially fed backing sheets into the influence of an alternating current corotron means positioned on the side of the insulating backing sheets remote from the member to subject the insulating backing sheets to alternating corona emissions to thereby minimize the electrostatic bond between the toner-bearing sheets and the member and, catching the toner-bearing backing sheets with sheet feed means as they separate from the member.
Claim 13
Dependent Claim
189 words
IN THE METHOD OF PRODUCING A XEROGRAPHIC COPY WHICH INCLUDES THE STEPS OF CHARGING A PHOTOCONDUCTIVE SURFACE WITH AN ELECTROSTATIC CHARGE, EXPOSING THE CHARGED SURFACE TO DISSIPATE THE CHARGE IN AN IMAGE CONFIGURATION CORRESPONDING TO THE OBJECT TO BE REPRODUCED, DEVELOPMENT THE EXPOSED SURFACE WITH CHARGED TONER PARTICLES AND ELECTROSTATICALLY TRANSFERRING THE TONER PARTICLES TO AN INSULATING BACKING SHEET, INCLUDING ELECTROSTATICALLY BONDING THE BACKING SHEET TO THE PHOTOCONDUCTIVE SURFACE BY APPLYING CHARGES OF A FIRST POLARITY ONTO THE BACKING SHEET, THE IMPROVEMENT COMPRISING: SUBSEQUENTLY DECREASING THE ELECTROSTATIC BONDING BETWEEN THE BACKING SHEET AND THE PHOTOCONDUCTIVE SURFACE TO ELECTROSTATICALLY STRIP THE TONER-BEARING BACKING SHEET FROM THE PHOTOCONDUCTIVE SURFACE, WHEREIN THE ELECTROSTATIC BONDING DECREASING STEP IS CARRIED OUT BY APPLYING TO THE BACKING SHEET CORONA EMISSIONS HAVING A NET SECOND POLARITY OPPOSITE FROM THE FIRST POLARITY CHARGES ON THE BACKING SHEET AND LARGE ENOUGH TO MINIMIZE SAID ELECTROSTATIC BONDING BUT LOWER THAN THE POTENTIAL WHICH WOULD REPEL THE TONER PARTICLES BACK ONTO THE PHOTOCONDUCTIVE SURFACE, AND THE BACKING SHEET IS THEN ALLOWED TO SEPARATE FROM THE PHOTOCONDUCTIVE SURFACE WHERE SAID SURFACE IS CYLINDRICAL BY THE SELF-STRAIGHTENING RESILIENCY OF THE BACKING SHEET.
Claim 14
Dependent Claim
189 words
IN THE METHOD OF PRODUCING A XEROGRAPHIC COPY WHICH INCLUDES THE STEPS OF CHARGING A PHOTOCONDUCTIVE SURFACE WITH AN ELECTROSTATIC CHARGE, EXPOSING THE CHARGED SURFACE TO DISSIPATE THE CHARGE IN AN IMAGE CONFIGURATION CORRESPONDING TO THE OBJECT TO BE REPRODUCED, DEVELOPMENT THE EXPOSED SURFACE WITH CHARGED TONER PARTICLES AND ELECTROSTATICALLY TRANSFERRING THE TONER PARTICLES TO AN INSULATING BACKING SHEET, INCLUDING ELECTROSTATICALLY BONDING THE BACKING SHEET TO THE PHOTOCONDUCTIVE SURFACE BY APPLYING CHARGES OF A FIRST POLARITY ONTO THE BACKING SHEET, THE IMPROVEMENT COMPRISING: SUBSEQUENTLY DECREASING THE ELECTROSTATIC BONDING BETWEEN THE BACKING SHEET AND THE PHOTOCONDUCTIVE SURFACE TO ELECTROSTATICALLY STRIP THE TONER-BEARING BACKING SHEET FROM THE PHOTOCONDUCTIVE SURFACE, WHEREIN THE ELECTROSTATIC BONDING DECREASING STEP IS CARRIED OUT BY APPLYING TO THE BACKING SHEET CORONA EMISSIONS HAVING A NET SECOND POLARITY OPPOSITE FROM THE FIRST POLARITY CHARGES ON THE BACKING SHEET AND LARGE ENOUGH TO MINIMIZE SAID ELECTROSTATIC BONDING BUT LOWER THAN THE POTENTIAL WHICH WOULD REPEL THE TONER PARTICLES BACK ONTO THE PHOTOCONDUCTIVE SURFACE, AND THE BACKING SHEET IS THEN ALLOWED TO SEPARATE FROM THE PHOTOCONDUCTIVE SURFACE WHERE SAID SURFACE IS CYLINDRICAL BY THE SELF-STRAIGHTENING RESILIENCY OF THE BACKING SHEET.
Claim 15
Dependent Claim
189 words
In the method of producing a xerographic copy which includes the steps of charging a photoconductive surface with an electrostatic charge, exposing the charged surface to dissipate the charge in an image configuration corresponding to the object to be reproduced, developing the exposed surface with charged toner particles and electrostatically transferring the toner particles to an insulating backing sheet, including electrostatically bonding the backing sheet to the photoconductive surface by applying charges of a first polarity onto the backing sheet, the improvement comprising: subsequently decreasing the electrostatic bonding between the backing sheet and the photoconductive surface to electrostatically strip the toner-bearing backing sheet from the photoconductive surface, wherein the electrostatic bonding decreasing step is carried out by applying to the backing sheet corona emissions having a net second polarity opposite from the first polarity charges on the backing sheet and large enough to minimize said electrostatic bonding but lower than the potential which would repel the toner particles back onto the photoconductive surface; and the backing sheet is then allowed to separate from the photoconductive surface where said surface is cylindrical by the self-straightening resiliency of the backing sheet.
Claim 16
Dependent Claim
189 words
In the method of producing a xerographic copy which includes the steps of charging a photoconductive surface with an electrostatic charge, exposing the charged surface to dissipate the charge in an image configuration corresponding to the object to be reproduced, developing the exposed surface with charged toner particles and electrostatically transferring the toner particles to an insulating backing sheet, including electrostatically bonding the backing sheet to the photoconductive surface by applying charges of a first polarity onto the backing sheet, the improvement comprising: subsequently decreasing the electrostatic bonding between the backing sheet and the photoconductive surface to electrostatically strip the toner-bearing backing sheet from the photoconductive surface, wherein the electrostatic bonding decreasing step is carried out by applying to the backing sheet corona emissions having a net second polarity opposite from the first polarity charges on the backing sheet and large enough to minimize said electrostatic bonding but lower than the potential which would repel the toner particles back onto the photoconductive surface; and the backing sheet is then allowed to separate from the photoconductive surface where said surface is cylindrical by the self-straightening resiliency of the backing sheet.
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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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |