Patent US3887809A successfully refreshed from Google Patents.
US3887809A
Expired / Lapsed
US
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Corona discharge device
Assignee: Hoechst AG
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Filing: 1974-11-14
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Granted: 1975-06-03
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Expires: 1994-11-14
Abstract
Abstract A corona discharge device for use in the electrophotographic field having an element which is in the form of a tape, has at least one conductive layer at its discharge edges, is so movable in the direction of its discharge edges that the corona discharge element can be moved at least by the length of the discharge zone and in that at least one cleaning device is provided for the corona discharge element, preferably outside the discharge zone. The tape is an endless belt having at least one edge which can discharge with that edge exhibiting various profiles. The belt also may be shaped with a depression or carry a guiding element to prevent lateral movement of the tape.
Inventors
- 👤 Gerhard Marx
- 👤 Hermann Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:18
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0258; G03G15/0291
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
78 words
A corona discharge device comprising an endless movable belt as at least one corona discharge element, said belt having at least one conductive layer at two discharge edges of the belt, a row of supported electrodes facing each discharge edge a uniform distance therefrom for a portion of said belt which with said portion form a discharge zone and a cleaning device through which said belt moves positioned outside of the discharge zone and extending along said belt.
Claim 2
Dependent Claim
78 words
A corona discharge device comprising an endless movable belt as at least one corona discharge element, said belt having at least one conductive layer at two discharge edges of the belt, a row of supported electrodes facing each discharge edge a uniform distance therefrom for a portion of said belt which with said portion form a discharge zone and a cleaning device through which said belt moves positioned outside of the discharge zone and extending along said belt.
Claim 3
Dependent Claim
78 words
A corona discharge device comprising an endless movable belt as at least one corona discharge element, said belt having at least one conductive layer at two discharge edges of the belt, a row of supported electrodes facing each discharge edge a uniform distance therefrom for a portion of said belt which with said portion form a discharge zone and a cleaning device through which said belt moves positioned outside of the discharge zone and extending along said belt.
Claim 4
Dependent Claim
78 words
A corona discharge device comprising an endless movable belt as at least one corona discharge element, said belt having at least one conductive layer at two discharge edges of the belt, a row of supported electrodes facing each discharge edge a uniform distance therefrom for a portion of said belt which with said portion form a discharge zone and a cleaning device through which said belt moves positioned outside of the discharge zone and extending along said belt.
Claim 5
Dependent Claim
61 words
The corona discharge device as claimed in claim 1, including a block in which the corona discharge device is arranged, two angle sheets securing said rows of electrodes to this block, guide rolls for driving said belt positioned in said block, which is arranged in a manner such that the corona discharging element is parallel to the web to be charged.
Claim 6
Dependent Claim
59 words
The corona discharge device as claimed in claim 2, in which said block defines two recesses between which is a bridge on which the endless belt is supported, each edge oF the belt facing a row of electrodes resting on the side walls of the recesses and protruding from the side walls in the direction of the belt edges.
Claim 7
Dependent Claim
35 words
The corona discharge device as claimed in claim 3, in which said block defines one or more longitudinal channels in connection with said recesses via several bores to remove ozone produced by the discharge process.
Claim 8
Dependent Claim
35 words
The corona discharge device as claimed in claim 2, in which the block defines a recess on its reverse side to the discharging zone, said recess housing said cleaning device and closed with a lid.
Claim 9
Dependent Claim
36 words
The corona discharge device as claimed in claim 5, in which said cleaning device consists of brushes distributed over the entire distance between the guide rolls in the recess on the reverse side of the block.
Claim 10
Dependent Claim
23 words
The corona discharge device as claimed in claim 1, in which the belt has at least one endless corrugation in its length direction.
Claim 11
Dependent Claim
43 words
The corona discharge device as claimed in claim 7, in which the bridge defines a longitudinal recess in form and depth corresponding to the corrugation of the belt, said longitudinal recess and corrugation being in engagement to secure said belt against lateral displacement.
Claim 12
Dependent Claim
43 words
The corona discharge device as claimed in claim 7, including a plate connected at both ends of the block, said plate having a rib engaging the corrugation of the belt to secure said belt against displacement transverse to the direction of its movement.
Claim 13
Dependent Claim
21 words
The corona discharge device as claimed in claim 1, in which the two rows of electrodes consist of densely arranged needles.
Claim 14
Dependent Claim
21 words
The corona discharge device as claimed in claim 1, in which the two rows of electrodes consist of endless circulating belts.
Claim 15
Dependent Claim
42 words
The corona discharge device as claimed in claim 11, including a block in which the corona discharge device is arranged and defining recesses for a cleaning device for each electrode belt on the side of the block opposite to the discharging zone.
Claim 16
Dependent Claim
73 words
The corona discharge device as claimed in claim 11, including a block in which the corona discharge device is arranged, said block defining two recesses between which is a bridge and outer side walls having horizontal ends, said electrode belts having corrugations which are in engagement with corresponding nips at the inner faces of the horizontal ends of the outer side walls of the block to prevent lateral displacement of the electrode belts.
Claim 17
Dependent Claim
29 words
The corona discharge device as claimed in claim 13, including means for driving said electrode belts in a direction opposite to the direction of rotation of the discharge element.
Claim 18
Dependent Claim
27 words
The corona discharge device as claimed in claim 13, including means for driving said electrode belts in the same direction as the discharge element at different speeds.
Claim 19
Dependent Claim
27 words
The corona discharge device as claimed in claim 1, in which the corona discharge element consists of several rigid individual elements connected with one another by joints.
Claim 20
Dependent Claim
26 words
The corona discharge device as claimed in claim 1, in which the corona discharge element consists of several rigid individual elements mounted on a flexible tape.
Claim 21
Dependent Claim
48 words
The corona discharge device as claimed in claim 1, in which the corona discharge element has at least one further electroconductive layer separated from the discharge edges of the corona discharge element by an insulating layer and connectable to a controlled voltage source with a variable output voltage.
Claim 22
Dependent Claim
20 words
The corona discharge device as claimed in claim 1, in which the corona discharge element and the electrodes are toothed.
Claim 23
Dependent Claim
29 words
The corona discharge device as claimed in claim 1, in which the endless belt is arranged parallel to the rows of electrodes in the form of an endless belt.
Claim 24
Dependent Claim
33 words
The corona discharge device as claimed in claim 20, including a housing containing cleaning devices for both belts, said housing partly including one of the guide rolls about which the belts are turned.
Claim 25
Dependent Claim
52 words
The corona discharge device as claimed in claim 1, including a block in which the Corona discharge device is arranged, said block defining two recesses between which is a bridge and side walls and control electrodes arranged on both sides of each row of electrodes and in the bridge of the block.
Claim 26
Dependent Claim
46 words
The corona discharge device as claimed in claim 22, in which a control electrode is provided in the bridge of the block above the corona discharge element and is arranged in the same plane with the control electrodes on one side of the rows of electrodes.
Claim 27
Dependent Claim
27 words
The corona discharge device as claimed in claim 22, in which each recess of the block has a control electrode arranged on the bottom of the recess.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |