Patent ID: 9168752
Filing Date: 2015-10-27
Classification: B41J

Abstract:
1. A print head priming system comprising: a vent closure section to close a vent during a priming session of a print head to prevent a fluid communication between an ambient pressure and a vent hole of the print head, and to open the vent during a printing session to compensate backpressure in the print head, wherein a control section causes the vent closure section to open and close the vent; an inlet to provide pressurized gas from a source of pressurized gas to the vent hole of the print head during the priming session, and to terminate the provision of the pressurized gas to the vent hole of the print head during the printing session; and a pressure relief valve to open in response to a pressure in the print head reaching or exceeding a predetermined value by the provision of the pressurized gas to the print head during the priming session.