Patent US3778622A successfully refreshed from Google Patents.
US3778622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charging apparatus for electro-photographic copying machines
Assignee: Iwatsu Electric Co Ltd
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Filing: 1970-09-30
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Granted: 1973-12-11
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Expires: 1990-09-30
Abstract
Abstract A charging apparatus for electrostatically charging copying material in an electro-photographic copying machine includes a receptacle with its bottom plate fitted detachably and held in place by a spring. This receptacle holds a tungsten wire to produce a corona discharge and the wire can be easily replaced by removing the bottom plate.
Inventors
- 👤 T Koike
- 👤 M Sakata
- 👤 A Kobayashi
- 👤 T Sugano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:36
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0258; G03G15/0291
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
122 words
Charging apparatus for electrostatically charging a photosensitive surface in an electrostatic copying machine, comprising a receptacle including walls forming openings on two opposing sides of said receptacle and a removable plate extending between an opposing pair of said walls and in resilient gripping engagement therewith so as to cover one of said openings with said plate, a wire in the receptacle for producing a corona discharge, at least one guide member spanning an opposing pair of said walls at the other of said openings for guiding a photosensitive material across the other of said openings to be charged by the corona discharge, Said guide member being tensioned between said opposing walls so as to enhance the gripping engagement with said removable plate.
Claim 2
Dependent Claim
122 words
Charging apparatus for electrostatically charging a photosensitive surface in an electrostatic copying machine, comprising a receptacle including walls forming openings on two opposing sides of said receptacle and a removable plate extending between an opposing pair of said walls and in resilient gripping engagement therewith so as to cover one of said openings with said plate, a wire in the receptacle for producing a corona discharge, at least one guide member spanning an opposing pair of said walls at the other of said openings for guiding a photosensitive material across the other of said openings to be charged by the corona discharge, Said guide member being tensioned between said opposing walls so as to enhance the gripping engagement with said removable plate.
Claim 3
Dependent Claim
47 words
Apparatus according to claim 1, wherein another opposing pair of said walls form end members comprising insulating material, between which said corona discharge wire extends, and a knob for sliding the apparatus in and out of the copying machine being provided on one of said end members.
Claim 4
Dependent Claim
32 words
Apparatus according to claim 1, wherein said guide member comprises an insulating thread or wire tensioned between said opposing pair of said walls to enhance the grip thereof on said removable plate.
Claim 5
Dependent Claim
14 words
Apparatus according to claim 1, wherein said opposing pair of said walls comprise aluminium.
Claim 6
Dependent Claim
14 words
Apparatus according to claim 4, wherein said aluminium walls are 0.1mm to 5mm thick.
Claim 7
Dependent Claim
11 words
Apparatus according to claim 1, wherein said removable plate comprises aluminium.
Claim 8
Dependent Claim
15 words
Apparatus according to claim 6, wherein said aluminium removable plate is 0.5mm to 5mm thick.
Claim 9
Dependent Claim
14 words
Apparatus according to claim 1, wherein said guide member is formed from nylon thread.
Claim 10
Dependent Claim
14 words
Apparatus according to claim 8, wherein said thread is 0.5mm to 1mm in diameter.
Claim 11
Dependent Claim
32 words
A charging unit comprising two apparatuses according to claim 1, fitted together with their open sides facing each other but spaced apart to allow the photosensitive material to enter between the apparatuses.
Claim 12
Dependent Claim
23 words
A charging unit according to claim 10 wherein the two apparatuses have projections and recesses which mate when the apparatuses are fitted together.
Claim 13
Dependent Claim
125 words
An electrostatic copying machine comprising charging apparatus for electrostatically charging photosensitive material and guide means for supporting said charging apparatus, said apparatus being slidably mounted in the guide means and comprising a receptacle including walls forming openings on two opposing sides and a removable plate extending between an opposing pair of said walls and in resilient gripping engagement therewith so as to cover one of said openings with said plate, a wire in the receptacle for producing a corona discharge, at least one guide member spanning an opposing pair of said walls at the other of said openings to be charged by the corona discharge, said guide member being tensioned between said opposing walls so as to enhance the gripping engagement with said removable plate.
Claim 14
Dependent Claim
125 words
An electrostatic copying machine comprising charging apparatus for electrostatically charging photosensitive material and guide means for supporting said charging apparatus, said apparatus being slidably mounted in the guide means and comprising a receptacle including walls forming openings on two opposing sides and a removable plate extending between an opposing pair of said walls and in resilient gripping engagement therewith so as to cover one of said openings with said plate, a wire in the receptacle for producing a corona discharge, at least one guide member spanning an opposing pair of said walls at the other of said openings to be charged by the corona discharge, said guide member being tensioned between said opposing walls so as to enhance the gripping engagement with said removable plate.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |