Method for damping pressure peaks in a line for ink of an inkjet printer

Abstract

A method for damping pressure peaks in an ink line of an inkjet printer includes connecting the line to a chamber (10, 16) divided by a diaphragm (11, 17) into an air-filled first space and an ink-filled second space, connecting the first space to an air-filled buffer (12, 18), connecting the buffer to an air pump (13), a) pumping air into the first space until freeing the chamber of ink and the diaphragm rests on a chamber wall or tension in the diaphragm begins rising substantially linearly, then b) pumping air out of the first space until filling the chamber with ink and the diaphragm rests on a chamber wall or tension of the diaphragm begins rising substantially linearly, while determining the number of pump cycles, then c) pumping air into the first space while passing through substantially half of the determined pump cycles. Steps a and b may be reversed.

Description

technical field [0001] The invention relates to a method for damping pressure peaks in an ink line of an inkjet printing machine with the features of claim 1 . Background technique [0002] When printing with one or more printing heads it is necessary that the printing heads are supplied with the ink to be printed. For this purpose, a storage container, a pump and a supply line (or a complex piping system, a so-called manifold) are generally provided, wherein, in a so-called circulation system, the ink is pumped from the storage container to the print head and is not The printed ink is pumped from the print head back into the storage container. In this case, so-called bypasses can also be provided in the ink supply line parallel to the printing head. A recirculating ink supply is especially used if the demands on printing quality and reliability are high. The advantage of the circulating supply is that, on the one hand, it offers the possibility of conveying the contained...

AI Technical Summary

Problems solved by technology

Since the above-mentioned adjustment variables (the above-mentioned two pressures) are measured in the corresponding manifolds, these adjustment variables cannot detect the pressure drop in the input pipe to the print head (and in particular inside the print head)

[0006] In addition to the mentioned pressure drop, however, there is also a pressure drop in the inlet line from the pump to the manifold which, although detected by the pressure sensor, cannot in each case be adjusted to the required bandwidth (range )

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