Liquid sensing apparatus for a liquid container for supplying a liquid to a liquid consuming apparatus, and a liquid container in which the liquid sensing apparatus is built
US7424824B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2005 |
| Grant date | Sep 16, 2008 |
| Priority date | — |
| Expiry date | Jun 16, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2002/17583
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A liquid sensing apparatus includes a liquid sensing chamber 33 having a liquid inlet port that is in communication with an external liquid container in which a liquid is reserved, and a liquid outlet port that is in communication with a liquid consuming apparatus, a movable member 34 movable depending on a liquid level in the liquid sensing chamber 33, a recess portion 33b, 41a for cooperating with a wall surface of the movable member 34 to form a closed space when the movable member 34 is moved to a predetermined position depending the liquid level, and a piezoelectric sensing means 40 for applying a vibration to the recess portion and sensing a state of a free vibration following upon the vibration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.