US4688927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic copying machine
Assignee: Minolta Co Ltd
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Filing: 1985-12-26
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Granted: 1987-08-25
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Expires: 2005-12-26
Abstract
Abstract An electrophotographic copying machine capable of producing successively a plurality of identical copies from one electrostatic latent image formed on a photoreceptor carrier, which machine comprises a charge eraser for preventing an electrostatic discharge from ocurring between the photoreceptor drum and a copying paper at a starting point of separation where the copying paper separates from the photoreceptor carrier after a toner image has been transferred onto the copying paper. The charge eraser is arranged so as to confront the separation point.
Inventors
- 👤 Masataka Oda
- 👤 Tsugihito Yoshiyama
- 👤 Hisashi Myochin
- 👤 Kouji Matsushita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6532; G03G15/6535; G03G15/14; G03G15/16; G03G15/163; G03G15/1635; B; B65; B65H; B65H2301/00; B65H2301/50; B65H2301/51; B65H2301/513; B65H2301/5133
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
51 words
An electrophotographic copying machine, comprising: means for producing successively a plurality of identical copies from one electrostatic latent image formed on a photoreceptor medium; and transfer and separation chargers for imparting an AC charge erasing component to a point of start of separation of the copying paper from the photoconductive medium.
Claim 2
Dependent Claim
51 words
An electrophotographic copying machine, comprising: means for producing successively a plurality of identical copies from one electrostatic latent image formed on a photoreceptor medium; and transfer and separation chargers for imparting an AC charge erasing component to a point of start of separation of the copying paper from the photoconductive medium.
Claim 3
Dependent Claim
28 words
The machine as claimed in claim 1, wherein the transfer charger is a SCOROTORON AC charger wherein some grid electrodes confronting the starting point of separation are omitted.
Claim 4
Dependent Claim
50 words
The machine as claimed in claim 1, wherein the transfer charger is a SCOROTORON AC charger, and further comprising means for applying one polarity DC voltage to only some grid electrodes confronting the starting point of separation and applying the opposite polarity voltage to the others of the grid electrodes.
Claim 5
Dependent Claim
53 words
The machine as claimed in claim 1, wherein the transfer charger and the separation charger are in the form of a DC charger and an AC charge erasing charger, respectively, and further comprising a stabilizer plate positioned adjacent the starting point of separation for partitioning the transfer and separation chargers from each other.
Claim 6
Independent Claim
53 words
A method for electrophotographic copying, comprising: successively producing a plurality of identical copies from one electrostatic latent image formed on a photoreceptor medium; and imparting an AC charge erasing component to a point of start of separation of the copying paper from the photocopying medium by the use of transfer and separation chargers.
Claim 7
Independent Claim
53 words
A method for electrophotographic copying, comprising: successively producing a plurality of identical copies from one electrostatic latent image formed on a photoreceptor medium; and imparting an AC charge erasing component to a point of start of separation of the copying paper from the photocopying medium by the use of transfer and separation chargers.
Claim 8
Dependent Claim
30 words
The method as claimed in claim 5, wherein the transfer charger is a SCOROTORON AC charger and some of the grid electrodes confronting the starting point of separation are omitted.
Claim 9
Dependent Claim
50 words
The method as claimed in claim 5, wherein the transfer charger is a SCOROTORON AC charger and further comprising the application of one polarity DC voltage to only some grid electrodes confronting the starting point of separation and applying the opposite polarity voltage to the others of the grid electrodes.
Claim 10
Dependent Claim
51 words
The method as claimed in claim 5, wherein the transfer charger and the separation charger are in the form of a DC charger an an AC charger, respectively, and further comprising positioning a stabilizer plate adjacent the starting point of separation for partitioning the transfer and separation chargers from each other.
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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) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |