Apparatus and method for flushing and/or operating an ink printhead or inkjet printhead equipped with a preloaded pressure buffer

Abstract

The invention relates to a device (1) for operating and / or flushing ink or inkjet printheads equipped with an upstream pressure buffer (2), wherein the pressure buffer (2) is provided with a closed, at least A buffer chamber (4) partially defined by the buffer membrane (3), the device comprising: a refill valve (5) arranged in the buffer chamber (4) for arching the buffer membrane (3) into the buffer chamber (4) to react to refill the buffer chamber (4) with ink; a controllable device (6) arranged outside the buffer chamber (4) that uses for applying external pressure to at least one region of the buffer membrane (3) defining the buffer chamber (4) in order to open a refill valve (5) arranged in the buffer chamber (4) and provide a passage A continuous open channel through the pressure damper for flushing the ink printhead or inkjet printhead and / or for applying an adjustable preload to the refill valve arranged in the damper chamber (4).

Description

technical field [0001] The invention relates to a device and a method for flushing and / or operating an ink printhead or an inkjet printhead equipped with a pre-positioned pressure buffer, wherein the pressure buffer is provided with a closed, at least partially, preferably airtight and / or or a chamber defined by a liquid-tight membrane. Background technique [0002] In the development of ink writing machines or printers, the problem of delivering ink as uniformly as possible has long been recognized. For example, DE 2 224 590 A describes the vibration of the ink delivery hose, whereby the ink delivery can be temporarily interrupted, and therefore proposes to arrange a small auxiliary storage, supplied by the actual ink container, on the carriage carrying the writing instrument, and From there, the ink is guided as vibration-free as possible in a short, thin tube to the actual writing needle. However, it is described as disadvantageous that vibrations are also induced on th...

AI Technical Summary

Problems solved by technology

However, the presence of a pressure damper with a continuous channel from its input to its output in this device impairs its damping capacity on the one hand and on the other hand makes it impossible for modern piezoelectric inkjet printheads to The generation of negative pressure becomes difficult because the ink is additionally sucked immediately with each negative pressure

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