Ink supply system for ink jet printing apparatus
US4413267A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 1981 |
| Grant date | Nov 1, 1983 |
| Priority date | — |
| Expiry date | Dec 18, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/175
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A recoverable ink supply system, comprising both method and apparatus, includes a primary reservoir which is connected by suitable fluid conduit to a prime, or primary, pump. The prime pump transfers the liquid ink from the primary reservoir to an intermediate reservoir at an increased pressure causing a lower pressure condition in the sealed primary reservoir and a higher pressure condition in the sealed intermediate reservoir. Secondary, or metering pumps, receive pressurized ink from the intermediate reservoir after it is filtered at the reservoir outlet, and supply metered, higher pressure ink through combined filter/pressure fluctuation dampers to associated on/off control valves. The control valves permit the flow of the pressurized ink into the print heads wherefrom the ink is discharged at a controlled uniform velocity. According to known print head technology, a uniform series of ink drops is discharged from the print heads which are either deflected to a recording medium to produce characters or collected by a catcher for recycling to the primary reservoir. Ink recycled to the primary reservoir contains entrapped air, or gas, and the major portion of the entrapped gas is …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.