Ink jet fluid supply system
US4346388A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1980 |
| Grant date | Aug 24, 1982 |
| Priority date | — |
| Expiry date | Jun 13, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/175
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A fluid supply system for an ink jet print head includes a recirculating path through a fluid pump, an inertial filter, and a variable restriction valve. Filtrate effluent from the inertial filter passes from the recirculating fluid path through a fixed restriction to the fluid supply line for the print head. The pressure drop across the fixed restriction is monitored and is utilized to control adjustment of the variable restriction valve in the recirculating fluid path such that the flow rate to the print head supply line is held constant. By this arrangement, the fluid within the print head may be maintained at a constant pressure level without the need for a pressure monitoring device directly associated with the print head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.