US3717801A
Expired / Lapsed
US
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Methods and apparatus for electrostatically performing a tacking operation
Assignee: Xerox Corp
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Filing: 1971-04-12
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Granted: 1973-02-20
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Expires: 1991-04-12
Abstract
Abstract Methods and apparatus for electrostatically performing a tacking operation are provided in accordance with the teachings of the instant invention wherein tacking charges are imposed by a coronode connected to an ac source and disposed in a charging relationship with the medium to be tacked. As the coronode is connected to an ac source, ion charging currents delivered thereby will exhibit the periodic variation and alternating polarity of the ac source. The tacking force applied to such medium will thereby display a periodic variation having a magnitude which is sufficient to maintain the medium in a tacked relationship with a desired surface when the medium is in the immediate environment of the coronode; however, as the medium is increasingly displayed from the immediate environment of the coronode, the magnitude of such tacking force will approach a zero value because the ion charging current delivered manifests a variation resembling a damped sinusoid or the like depending upon the nature of the periodic variation of said ac source. Therefore, upon the completion of the tacking operation, stripping of the medium may be readily achieved.
Inventors
- 👤 M Silverberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:03
CPC Classifications
B; B65; B65H; B65H5/00; B65H5/004; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49998
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
234 words
Apparatus for electrostatically tacking a medium to a surface comprising: a translatable surface for transporting said medium in accurate registration therewith in the absence of any relative motion therebetween; corotron means including a coronode configuration to be brought into a charging relationship with said medium when said medium is disposed on said surface in an appropriate manner to be tacked thereto, said coronode configuration occupying a sufficient spatial extent relative to said medium to deliver, when energized, ion charging current thereto over a sufficient surface area of said medium to firmly tack said medium to said surface for a selected spatial interval of motion of said medium, said selected spatial interval of tacking obtaining only when said medium is transported into a charging relationship with said coronode configuration; and means for applying a time varying input signal to said coronode configuration to accomplish the energization thereof, said time varying input signal exhibiting a waveform having equal and opposite half-cycles disposed about a reference level and magnitude portions exceeding the positive and negative corona threshold potentials of said coronode configuration, whereby said coronode configuration imposes positive and negative levels of charge on said medium in an alternating manner determined by said time varying input signal to firmly tack said medium to said surface for said selecTed spatial interval while said charge levels are reduced to zero when said medium is transported past said spatial interval.
Claim 2
Dependent Claim
234 words
Apparatus for electrostatically tacking a medium to a surface comprising: a translatable surface for transporting said medium in accurate registration therewith in the absence of any relative motion therebetween; corotron means including a coronode configuration to be brought into a charging relationship with said medium when said medium is disposed on said surface in an appropriate manner to be tacked thereto, said coronode configuration occupying a sufficient spatial extent relative to said medium to deliver, when energized, ion charging current thereto over a sufficient surface area of said medium to firmly tack said medium to said surface for a selected spatial interval of motion of said medium, said selected spatial interval of tacking obtaining only when said medium is transported into a charging relationship with said coronode configuration; and means for applying a time varying input signal to said coronode configuration to accomplish the energization thereof, said time varying input signal exhibiting a waveform having equal and opposite half-cycles disposed about a reference level and magnitude portions exceeding the positive and negative corona threshold potentials of said coronode configuration, whereby said coronode configuration imposes positive and negative levels of charge on said medium in an alternating manner determined by said time varying input signal to firmly tack said medium to said surface for said selecTed spatial interval while said charge levels are reduced to zero when said medium is transported past said spatial interval.
Claim 3
Dependent Claim
234 words
Apparatus for electrostatically tacking a medium to a surface comprising: a translatable surface for transporting said medium in accurate registration therewith in the absence of any relative motion therebetween; corotron means including a coronode configuration to be brought into a charging relationship with said medium when said medium is disposed on said surface in an appropriate manner to be tacked thereto, said coronode configuration occupying a sufficient spatial extent relative to said medium to deliver, when energized, ion charging current thereto over a sufficient surface area of said medium to firmly tack said medium to said surface for a selected spatial interval of motion of said medium, said selected spatial interval of tacking obtaining only when said medium is transported into a charging relationship with said coronode configuration; and means for applying a time varying input signal to said coronode configuration to accomplish the energization thereof, said time varying input signal exhibiting a waveform having equal and opposite half-cycles disposed about a reference level and magnitude portions exceeding the positive and negative corona threshold potentials of said coronode configuration, whereby said coronode configuration imposes positive and negative levels of charge on said medium in an alternating manner determined by said time varying input signal to firmly tack said medium to said surface for said selecTed spatial interval while said charge levels are reduced to zero when said medium is transported past said spatial interval.
Claim 4
Dependent Claim
234 words
Apparatus for electrostatically tacking a medium to a surface comprising: a translatable surface for transporting said medium in accurate registration therewith in the absence of any relative motion therebetween; corotron means including a coronode configuration to be brought into a charging relationship with said medium when said medium is disposed on said surface in an appropriate manner to be tacked thereto, said coronode configuration occupying a sufficient spatial extent relative to said medium to deliver, when energized, ion charging current thereto over a sufficient surface area of said medium to firmly tack said medium to said surface for a selected spatial interval of motion of said medium, said selected spatial interval of tacking obtaining only when said medium is transported into a charging relationship with said coronode configuration; and means for applying a time varying input signal to said coronode configuration to accomplish the energization thereof, said time varying input signal exhibiting a waveform having equal and opposite half-cycles disposed about a reference level and magnitude portions exceeding the positive and negative corona threshold potentials of said coronode configuration, whereby said coronode configuration imposes positive and negative levels of charge on said medium in an alternating manner determined by said time varying input signal to firmly tack said medium to said surface for said selecTed spatial interval while said charge levels are reduced to zero when said medium is transported past said spatial interval.
Claim 5
Dependent Claim
53 words
The apparatus for electrostatically tacking according to claim 1 wherein said surface is unidirectionally translatable and said selected spatial interval of tacking occurs along a distance of displacement similar in length to an axis of the spatial extent occupied by said coronode configuration parallel to the direction in which said medium is transported.
Claim 6
Dependent Claim
45 words
The apparatus for electrostatically tacking according to claim 1 wherein said coronode configuration comprises a plurality of parallely disposed individual coronode means connected to said means for applying a time varying input signal, said coronode means being disposed in a plane parallel to said surface.
Claim 7
Dependent Claim
29 words
The apparatus for electrostatically tacking according to claim 3 wherein said plurality of parallely disposed individual coronode means comprise a plurality of substantially equally spaced strands of conductive wire.
Claim 8
Dependent Claim
33 words
The apparatus for electrostatically tacking according to claim 3 wherein said plurality of parallely disposed individual coronode means comprise strands of conductive wire woven in a screen arrangement with transversely disposed insulating elements.
Claim 9
Dependent Claim
36 words
The apparatus for electrostatically tacking according to claim 3 wherein said surface is unidirectionally translatable and said plurality of parallely disposed individual coronode means are disposed transversely to the direction in which said medium is transported.
Claim 10
Dependent Claim
29 words
The apparatus for electrostatically tacking according to claim 6 wherein said plurality of parallely disposed individual coronode means comprise a plurality of substantially equally spaced strands of conductive wire.
Claim 11
Dependent Claim
33 words
The apparatus for electrostatically tacking according to claim 6 wherein said plurality of parallely disposed individual coronode means comprise strands of conductive wire woven in a screen arrangement with transversely disposed insulating elements.
Claim 12
Dependent Claim
61 words
The apparatus for electrostatically tacking according to claim 3 wherein selected ones of said plurality of parallely disposed individual coronode means are connected directly to said means for applying a time varying input signal while others of said plurality of parallely disposed individual coronode means are connected to said means for applying a time varying input signal through phase shift means.
Claim 13
Dependent Claim
36 words
The apparatus for electrostatically tacking according to claim 9 wherein said surface is unidirectionally translatable and said plurality of parallely disposed individual coronode means are disposed transversely to the direction in which said medium is transported.
Claim 14
Dependent Claim
29 words
The apparatus for electrostatically tacking according to claim 10 wherein said plurality of parallely disposed individual coronode means comprise a plurality of substantially equally spaced strands of conductive wire.
Claim 15
Dependent Claim
48 words
The apparatus for electrostatically tacking according to claim 11 wherein said selected ones of said plurality of parallely disposed individual coronode means which are directly connected to said means for applying a time varying input signal comprise alternate ones of said plurality of parallely disposed individual coronode means.
Claim 16
Dependent Claim
25 words
The apparatus for electrostatically tacking according to claim 12 wherein said phase shift means inserts a ninety degree phase shift into input signals applied thereto.
Claim 17
Dependent Claim
95 words
The apparatus for electrostatically tacking according to claim 1 wherein said coronode configuration comprises unitary coronode means formed of a substantial length of conductive material shaped in a manner to exhibit a plurality of turning points in a plane parallel to a major surface of said medium, said unitary coronode means thereby threading back and forth in serpentine fashion above said surface of said medium when said medium is in a charging relationship therewith, said spatial extent being defined by the area in space occupied by said substantial length of conductIve material shaped as aforesaid.
Claim 18
Dependent Claim
65 words
The apparatus for electrostatically tacking according to claim 14 wherein said surface is unidirectionally translatable and said plurality of turning points are each substantially right angles, said coronode means formed by said substantial length of conductive material and shaped in the aforesaid manner thereby having portions disposed transversely to the direction in which said medium is transported and other portions disposed parallel to said direction.
Claim 19
Dependent Claim
33 words
The apparatus for electrostatically tacking according to claim 15 wherein said portions of said coronode means disposed transversely to said direction in which said medium is transported are equally spaced from one another.
Claim 20
Dependent Claim
48 words
The apparatus for electrostatically tacking according to claim 16 wherein said portions of said coronode means disposed transversely to said direction in which said medium is transported are substantially equal in length to the axial dimension of said medium in a direction transverse to said direction of transport.
Claim 21
Independent Claim
245 words
A method for electrostatically tacking a medium to a surface comprising the steps of: placing said medium in relative motion with coronode means when said medium is disposed on said surface in an appropriate manner to be tacked thereto so that said medium is transported by said surface into a charging relationship with said coronode means and subsequently removed therefrom; applying a time varying input signal to said coronode means to achieve the energization thereof, said time varying input signal being selected to exhibit a waveform having equal and opposite half-cycles disposed about a reference level and peak magnitude portions exceeding the positive and negative corona threshold potentials associated with said coronode means, and delivering positive and negative ion charging current in an alternating manner determined by said time varying input signal to sufficient surface area of said medium to firmly tack said medium to said surface for a selected spatial interval of relative motion between said coronode means and said medium corresponding substantially to an interval when portions of said medium are disposed in a charging relationship to said coronode means whereby said coronode means imposes positive and negative levels of charge on said medium in an alternating manner determined by said time varying input signal to firmly tack said medium to said surface in the absence of any relative motion therebetween for said selected spatial interval while said charge levels are reduced to zero when said medium is transported past said spatial interval.
Claim 22
Independent Claim
245 words
A method for electrostatically tacking a medium to a surface comprising the steps of: placing said medium in relative motion with coronode means when said medium is disposed on said surface in an appropriate manner to be tacked thereto so that said medium is transported by said surface into a charging relationship with said coronode means and subsequently removed therefrom; applying a time varying input signal to said coronode means to achieve the energization thereof, said time varying input signal being selected to exhibit a waveform having equal and opposite half-cycles disposed about a reference level and peak magnitude portions exceeding the positive and negative corona threshold potentials associated with said coronode means, and delivering positive and negative ion charging current in an alternating manner determined by said time varying input signal to sufficient surface area of said medium to firmly tack said medium to said surface for a selected spatial interval of relative motion between said coronode means and said medium corresponding substantially to an interval when portions of said medium are disposed in a charging relationship to said coronode means whereby said coronode means imposes positive and negative levels of charge on said medium in an alternating manner determined by said time varying input signal to firmly tack said medium to said surface in the absence of any relative motion therebetween for said selected spatial interval while said charge levels are reduced to zero when said medium is transported past said spatial interval.
References Cited (Backward Citations)
US3325709A
Cited
US3359469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |