Ink jet printer
US4644372A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 15, 1985 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Jul 15, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/20
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A printer which utilizes a charge controlled ink jet head is disclosed. A platen and its surrounding parts will be marred if the ink jet head is operated when there is no paper around the platen. Thus, the detection of a paper is of importance, and accordingly, a paper sensor is disposed near the platen. To prevent the sensor from being contaminated by the ink, the paper sensor is disposed rearward of the platen, as viewed from the ink jet head. The presence or absence of a record paper in front of the ink jet head is determined by a microprocessor which responds to a detection signal from the paper sensor and the amount of rotation which the platen has undergone since the detection of a paper by the sensor. If the printing operation is in pause over a given time interval at the end thereof or after the initiation of the projection of an ink jet, the projection of the ink jet is interrupted in order to reduce evaporation of solvent from the ink. It takes a relatively long time from the initiation of the projection of an ink jet until the recording operation is enabled. For this reason, a reset switch is provided to permit the projection of an ink jet to be started before a print co…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.