Ink-jet recording apparatus
US6378971B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Nov 15, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2002/17576
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An ink storage chamber has an indicator formed from magnetic material. A float member whose upper position is limited is housed in the ink storage chamber. Two magnetic-field detection system are provided at a position on the exterior of a sub-tank at which the detection system can detect a magnetic flux of the indicator simultaneously, such that the longitudinal direction of the detection system is oriented vertically with a specified ink level of the sub-tank sandwiched between the detection system. On the basis of signals output from the magnetic-field detection system, it is determined whether the ink level is in any one of an excessively low ink level state, a state in which injection of ink must be started, a state in which injection of ink must be stopped, and an excessively supplied state. Thus, an ink level in the sub-tank can be controlled within a specific range without involvement of an undesired increase in the number of sensors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.