Developing material supplying control device for electrostatic copying apparatus
US4405226A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1981 |
| Grant date | Sep 20, 1983 |
| Priority date | — |
| Expiry date | Jul 16, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S222/01
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a developing material supplying control device for an electrostatic copying apparatus which includes an oscillator circuit composed of an oscillation coil provided along a toner supplying passage, a timer, a counter for counting the output signal from the oscillation circuit at every interval predetermined by the timer to supply a discriminating output signal when the counted value is equal to a predetermined value for each of the intervals. A toner supply acts in response to the discriminating output signal from the counter for supplying toner to the toner supplying passage. Since this invention employs the oscillation coil and does not employ a mechanical switch having a movable contact for detecting toner in the toner supplying passage, the toner supplying operation is achieved precisely.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.