PRINT HEAD FOR AN INK JET PRINTER

摘要

A print head for an ink jet printer includes at least one ink supply channel and at least one nozzle having a nozzle channel and an inflow opening, and ink can be pressed from the ink supply channel through the inflow opening into the nozzle channel and ejected therefrom, wherein the nozzle is arranged in a stationary manner on a side wall of the ink supply channel and in the ink supply channel a ram is provided, which can be moved back and forth between a reversal point that has a minimal distance from the inflow opening of the nozzle and a reversal point that has a maximal distance from the inflow opening of the nozzle, wherein a first limiting device limits the movement of a ram end face to a movement between the reversal points; and a second external device is provided for applying a negative pressure relative to the ambient air pressure to the ink in the ink supply channel.

主权项

1. A print head for an ink jet printer, the print head comprising at least one ink supply channel and at least one nozzle with a nozzle channel and inflow opening, ink being pressed through the inflow opening from the ink supply channel into the nozzle channel and ejected from the latter, the nozzle being arranged in a stationary manner on a side wall of the ink supply channel and a ram is assigned to the at least one nozzle with a ram end face in the ink supply channel which ram end face is spaced apart opposite the inflow opening,
the print head comprising a first moving device for moving the ram end face in the ink supply channel between a first reversal point that has a minimum distance from the inflow opening of the nozzle and a second reversal point that has a maximum distance from the inflow opening of the nozzle, wherein the first moving device delimits the movement of the ram end face to a movement between the first and second reversal points, wherein at said first reversal point said minimum distance is greater than a particle size of pigments of an ink, wherein a pressurizer is provided for pressurizing the ink in the ink supply channel with a negative pressure relative to the environmental air pressure, and wherein a circulating pump is provided for pumping said ink through said ink supply channel of the print head.