JPS57198476A - Measuring system for toner concentration - Google Patents
Measuring system for toner concentrationInfo
- Publication number
- JPS57198476A JPS57198476A JP56083672A JP8367281A JPS57198476A JP S57198476 A JPS57198476 A JP S57198476A JP 56083672 A JP56083672 A JP 56083672A JP 8367281 A JP8367281 A JP 8367281A JP S57198476 A JPS57198476 A JP S57198476A
- Authority
- JP
- Japan
- Prior art keywords
- output
- toner concentration
- monostable multivibrator
- toner
- comparator
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
- G03G15/0849—Detection or control means for the developer concentration
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
- G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
- G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE:To measure toner concentration always at proper timing by making a timing singal generate by the leading edge of a detecting signal for a toner concentration measuring pattern on a photosensitive element in a conpying machine. CONSTITUTION:A monostable multivibrator MM1 is triggered by the leading edge of an output from a comparator A4 and a monostable multivibrator MM2 is also triggered by the leading edge of an output from the MM1. The output of the MM2 is generated only the period when a sensor 16 detects a toner concentration detecting pattern on a drum 1 and inputted to a gate circuit G1. A comparator A3 sends its output through the gate circuit G1 and, when the input of the comparator A3 falls less that the standard voltage, the output is turned to high level. consequently when the toner concentration is reduced less than a set point, the output of the circuit G1 is turned to high level and triggers the monostable multivibrator and the output of the monostable multivibrator actuates a toner feeding circuit, so that toner is supplied to a developer in a developing device and the toner concentration is controlled to be set to the set point. Thus, the toner concentration can be measured at proper timing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56083672A JPS57198476A (en) | 1981-05-30 | 1981-05-30 | Measuring system for toner concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56083672A JPS57198476A (en) | 1981-05-30 | 1981-05-30 | Measuring system for toner concentration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57198476A true JPS57198476A (en) | 1982-12-06 |
Family
ID=13808964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56083672A Pending JPS57198476A (en) | 1981-05-30 | 1981-05-30 | Measuring system for toner concentration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57198476A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015045762A (en) * | 2013-08-28 | 2015-03-12 | 京セラドキュメントソリューションズ株式会社 | Image forming apparatus |
-
1981
- 1981-05-30 JP JP56083672A patent/JPS57198476A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015045762A (en) * | 2013-08-28 | 2015-03-12 | 京セラドキュメントソリューションズ株式会社 | Image forming apparatus |
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