초록 ▼

The ink jet printing system contains at least one ink jet printing head operatively connected to printing medium reservoirs by a conduit system. A partial ink flow is passed through a regulating apparatus for viscosity-dependent regulation. On exceeding the ink viscosity or ink density, a spindle bo

The ink jet printing system contains at least one ink jet printing head operatively connected to printing medium reservoirs by a conduit system. A partial ink flow is passed through a regulating apparatus for viscosity-dependent regulation. On exceeding the ink viscosity or ink density, a spindle body constructed as a float contacts a switch constructed as a proximity switch. The switch is operated such that a corresponding signal is supplied to a control valve and as a result the supply of solvent to a main ink reservoir of the printing medium reservoirs is initiated. The regulating apparatus may constitute an independent assembly associated with the main ink reservoir or can be integrated into the main ink reservoir.

대표청구항 ▼

A method of regulating the ink viscosity in an ink jet printing system containing an ink jet printing head, a main ink reservoir, a solvent reservoir, a conduit interconnecting said main ink reservoir and said solvent reservoir, and a control valve governing said conduit, said method comprising the

A method of regulating the ink viscosity in an ink jet printing system containing an ink jet printing head, a main ink reservoir, a solvent reservoir, a conduit interconnecting said main ink reservoir and said solvent reservoir, and a control valve governing said conduit, said method comprising the steps of: feeding ink of a predetermined ink viscosity to the ink jet printing head for generating ink droplets to be electrically charged and deflected during an ink jet printing operation; during said step of feeding said ink to said ink jet printing head, branch-off a partial ink flow; returning to the main ink reservoir said branch-off partial ink flow through regulating means through which flows the branch-off partial ink flow in a predetermined flow direction; positionally adjusting, in said regulating means during said branched-off partial ink flow, a floating spindle body in and opposite to said predetermined flow direction in response to variations in the ink viscosity in said branched-off partial ink flow; sensing a predetermined position of said floating spindle body in said regulating means which indicative of an ink viscosity which exceeds said predetermined ink viscosity; and regulating said ink viscosity by operating said control valve in said predetermined position of said floating spindle body and passing the solvent from said solvent reservoir through said control valve into the main ink reservoir as long as the ink viscosity in said branched-off ink flow exceeds said predetermined ink viscosity.