Drop deflection device and method for drop marking systems
US4845512A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Oct 12, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/09
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A drop deflection device suitable for use in a drop marking system employs an electret. Electrically conductive marking drops such as inks are given an electrical charge. The drops pass between a pair of deflections plates at least one of which is formed by an electret (a dielectric material which has been subjected to corona discharge to create a relatively permanent electrically charged material body). Depending upon the presence or absence of a charge on a particular drop, it will be deflected by the field between the plates on to a substrate for marking. If uncharged, the drops continue to a collection device which returns them to the ink reservoir.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.