| 摘要 |
An ink jet system printer of the charge amplitude controlling type includes a beam gutter for collecting ink droplets not contributing to the actual printing operation. An ink returning system is provided for returning the collected ink liquid to an ink liquid reservoir. An optical detection system is provided in the course of the ink returning system for detecting whether the ink liquid is properly collected by the beam gutter. When the ink liquid is not observed by the optical detection system for a period longer than a preselected period, a determination system develops a control signal for terminating the formation of the ink droplets.
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