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US4659206A
Expired / Lapsed
US
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Photoconductive drum device for electrostatic copying machines or the like
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1985-05-23
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Granted: 1987-04-21
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Expires: 2005-05-23
Abstract
Abstract A photoconductive drum device for electrostatic copying machines or the like includes a temperature maintaining heater bent to a cylindrical form and accommodated in the main body of a photoconductive drum. The heater is constructed with a base plate and a heat generator attached to the base plate. The base plate has a parallelogrammatic form substantially corresponding to a shape which is obtained by cutting a hollow cylinder, having a diameter approximate to the inside diameter of the drum main body, along a helical cut line and unbending the cylinder.
Inventors
- 👤 Masami Kai
- 👤 Shigeo Kurando
- 👤 Toshinobu Katafuchi
- 👤 Katsumi Amakawa
- 👤 Tetsuji Kajitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:03
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/75; G03G15/751
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
A photoconductive drum device for electrostatic copying machines or the like comprising a cylindrical photoconductive drum having a hollow interior and an outer surface comprising a photoconductive layer, and a temperature-maintaining heater comprising a base plate made of a resilient material and a heat generator provided on one surface of the base plate, the base plate having a parallelogrammatic form substantially corresponding to a shape obtained by cutting a hollow cylinder having a diameter approximate to an inside diameter of the drum along a helical cut line and unbending the hollow cylinder, the heat generator having a plurality of straight portions arranged at a specified spacing substantially in parallel with a side edge of the base plate defined by the helical cut line, the heater being bent to a cylindrical form and accommodated in the hollow interior of the photoconductive drum.
Claim 2
Dependent Claim
141 words
A photoconductive drum device for electrostatic copying machines or the like comprising a cylindrical photoconductive drum having a hollow interior and an outer surface comprising a photoconductive layer, and a temperature-maintaining heater comprising a base plate made of a resilient material and a heat generator provided on one surface of the base plate, the base plate having a parallelogrammatic form substantially corresponding to a shape obtained by cutting a hollow cylinder having a diameter approximate to an inside diameter of the drum along a helical cut line and unbending the hollow cylinder, the heat generator having a plurality of straight portions arranged at a specified spacing substantially in parallel with a side edge of the base plate defined by the helical cut line, the heater being bent to a cylindrical form and accommodated in the hollow interior of the photoconductive drum.
Claim 3
Dependent Claim
18 words
A photoconductive drum device as defined in claim 1 wherein the base plate is made of stainless steel.
Claim 4
Dependent Claim
47 words
A phtoconductive drum device as defined in claim 1 wherein the temperature maintaining heater is accommodated in the drum by bending and twistingly rotating the base plate into the hollow interior of the drum with said one surface of the base plate facing inwardly of the drum.
Claim 5
Dependent Claim
55 words
A photoconductive drum device as defined in claim 1 further comprising a temperature sensor disposed in the hollow interior of the photoconductive drum for detecting a temperature of the drum, and a current control unit for controlling an amount of current to be passed through the heater according to a detection signal from the sensor.
Claim 6
Dependent Claim
60 words
A photoconductive drum device as defined in claim 4 wherein the temperature sensor is disposed in the drum with respect to a longitudinal direction thereof approximatly in the middle between a highest temperature portion of the drum and a portion of the drum having a lower temperature due to removal of heat by copy paper during operation of the drum.
Claim 7
Dependent Claim
19 words
A photoconductive drum device as defined in claim 4 wherein the temperature sensor is disposed within the temperature-maintaining heater.
References Cited (Backward Citations)
US3349221A
Cited
US3471683A
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US4161357A
Cited
JPS5553348A
Cited
US4297562A
Cited
US4301359A
Cited
JPS578556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |