Driving circuit for printing device in electronic cash register
US4287550A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1980 |
| Grant date | Sep 1, 1981 |
| Priority date | — |
| Expiry date | Mar 26, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/1877
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A driving circuit for printing devices in an electric cash register comprising a pair of first diodes which are connected in series in the normal direction respectively with a journal printing magnet and receipt printing magnet paired with each other and are connected with each other, a first switching transistor connected between the connecting point of the pair of first diodes and a negative (-) terminal of a current source, a second diode connected in the reverse direction between said connecting point and a positive (+) terminal of the current source, a second switching transistor connected between a common feeding line to the journal printing magnets and the positive (+) terminal of the current source and a third switching transistor connected between a common feeding line to the receipt printing magnets and the positive (+) terminal of the current source, to simplify the circuit formation and reduce the manufacturing cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.