Printing unit

A printing system (01), wherein the printing system (01) has at least one reservoir (03) for coating medium and an equalizing tank (04) and at least one print head (02), and wherein the at least one print head (02) is fluidically connected to the equalizing tank (04) via at least one print head feed line (26), and wherein the printing system (01) has at least one supply line (06), which extends from the reservoir (03) to the equalizing tank (04), and wherein at least one first pump (09) is positioned along the at least one supply line (06), and wherein the printing system (01) has a second pump (13) configured as a gas supply pump (13), and wherein the printing system (01) has a third pump (17) configured as a gas removal pump (17), characterized in that a line volume bordering a pump outlet (16) of the second pump (13) passes fluidically without interruption into an interior chamber (07) of the equalizing tank (04), at least during a printing operation, and in that a line volume bordering a pump inlet (18) of the third pump (17) passes fluidically without interruption, at least during a printing operation, into the interior chamber (07) of the equalizing tank (04), and in that an outlet valve that forms a pump outlet (12) of the first pump (09) is configured as a check valve, and in that an outlet valve that forms the pump outlet (16) of the second pump (13) is configured as a check valve, and in that an inlet valve that forms the pump inlet (18) of the third pump (17) is configured as a check valve.

A printing system (01), wherein the printing system (01) has at least one reservoir (03) for coating medium and an equalizing tank (04) and at least one print head (02), and wherein the at least one print head (02) is fluidically connected to the equalizing tank (04) via at least one print head feed line (26), and wherein the printing system (01) has at least one supply line (06), which extends from the reservoir (03) to the equalizing tank (04), characterized in that at least three pumps (09;

• 13;
• 17) embodied as diaphragm pumps (09;
• 13;
• 17) are provided, the respective pump inlets (18) or pump outlets (12;
• 16) of which, at least during a printing operation, are fluidically connected without interruption to an interior chamber (07) of said equalizing tank (04), and in that at least one first pump (09) embodied as a diaphragm pump (09) is positioned along the at least one supply line (06), and in that the printing system (01) has a second pump (13) embodied as a diaphragm pump (13) and configured as a gas supply pump (13), and a line volume bordering a pump outlet (16) of the second pump (13) passes into the interior chamber (07) of the equalizing tank (04), and in that the printing system (01) has a third pump (17) embodied as a membrane pump (17) and configured as a gas removal pump (17), and a line volume bordering a pump inlet (18) of the third pump (17) passes into the interior chamber (07) of the equalizing tank (04), and in that the printing system (01) comprises a main unit (33) and a print head unit (34), and in that the reservoir (03) is a component of the main unit (33), and in that the at least one print head (02) is configured as a component (02) of the print head unit (34), and in that the print head unit (34) is connected to the main unit (33) by at least one flexible supply connection (36), and in that the first pump (09) and/or the gas supply pump (13) and/or the gas removal pump (17) is configured as a component (09;
• 13;
• 17) of the main unit (33), and in that the print head unit (34) as a whole can be arranged in different printing positions relative to the main unit (33).