JPS5557858A - Transfer bias control method of electrophotographic copier - Google Patents
Transfer bias control method of electrophotographic copierInfo
- Publication number
- JPS5557858A JPS5557858A JP13096478A JP13096478A JPS5557858A JP S5557858 A JPS5557858 A JP S5557858A JP 13096478 A JP13096478 A JP 13096478A JP 13096478 A JP13096478 A JP 13096478A JP S5557858 A JPS5557858 A JP S5557858A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- transfer bias
- copying
- transfer
- control method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE: To make image density constant by controlling the applied voltage to a transfer bias applying device according to the number of already copied sheets at the time of performing copying of plural sheets from one sheet of the original.
CONSTITUTION: It is detected that copying of the first sheet has ended at the time of obtaining the second sheet of copy and this detection signal as well as the detection signal to the effect that it is copying of the second sheet are inputted through an input unit 2 to a central processing unit 4. The central processing unit 4 calculates the transfer bias voltage V2 in the next copying by the calculation formula shown by formula I. The results of this calculation are applied to the power source in a transfer bias voltage applying device 6 by way of an output unit 5 to change over the internal resistance thereof, whereby the applied voltage to the transfer roll is changed and the transfer of the second sheet is thus accomplished. In this way, image density may be made constant.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13096478A JPS5557858A (en) | 1978-10-24 | 1978-10-24 | Transfer bias control method of electrophotographic copier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13096478A JPS5557858A (en) | 1978-10-24 | 1978-10-24 | Transfer bias control method of electrophotographic copier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5557858A true JPS5557858A (en) | 1980-04-30 |
Family
ID=15046733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13096478A Pending JPS5557858A (en) | 1978-10-24 | 1978-10-24 | Transfer bias control method of electrophotographic copier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5557858A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6068365A (en) * | 1983-09-02 | 1985-04-18 | Ricoh Co Ltd | Electrostatic copying machine with electrically biased transfer place |
| US5291253A (en) * | 1989-12-20 | 1994-03-01 | Hitachi, Ltd. | Corona deterioration and moisture compensation for transfer unit in an electrophotographic apparatus |
-
1978
- 1978-10-24 JP JP13096478A patent/JPS5557858A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6068365A (en) * | 1983-09-02 | 1985-04-18 | Ricoh Co Ltd | Electrostatic copying machine with electrically biased transfer place |
| US5291253A (en) * | 1989-12-20 | 1994-03-01 | Hitachi, Ltd. | Corona deterioration and moisture compensation for transfer unit in an electrophotographic apparatus |
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