Abstract: In a method to operate a printer or copier to print to a printing substrate, or in such a printer or copier, toner concentrate is extracted from a toner concentrate reservoir and carrier fluid is extracted from a carrier fluid reservoir. The extracted toner concentrate and carrier fluid are supplied to a mixer where mixing occurs to form a developer mixture. The developer mixture is applied to a developer roller with aid of an electrical field. Given an exchange of least one of the toner concentration reservoir and the carrier fluid reservoir, a strength of the electrical field is modified such that a predetermined desired inking of the printing substrate is maintained even given a change of a toner concentration in the developer mixture due to the exchange.

Abstract: In a method to operate a printer or copier to print to a printing substrate, or in such a printer or copier, toner concentrate is extracted from a toner concentrate reservoir and carrier fluid is extracted from a carrier fluid reservoir. The extracted toner concentrate and carrier fluid are supplied to a mixer where mixing occurs to form a developer mixture. The developer mixture is applied to a developer roller with aid of an electrical field. Given an exchange of least one of the toner concentration reservoir and the carrier fluid reservoir, a strength of the electrical field is modified such that a predetermined desired inking of the printing substrate is maintained even given a change of a toner concentration in the developer mixture due to the exchange.

Abstract: In a digital printer, print groups are provided each having a respective developer station using liquid developer comprising carrier fluid and toner. A supply arrangement to supply the print groups is provided with fluids and to accept used and unconsumed fluids from the print groups. The supply arrangement has a first supply unit common to all print groups to supply the print groups with the fluids, at least one reservoir containing a carrier fluid. A second supply unit per color supplies the respective print group for the color with liquid developer. The second supply unit comprises a first buffer container connected with a reservoir, the reservoir containing carrier fluid and concentrated toner as toner concentrate. A second buffer container for carrier fluid is connected with the carrier fluid reservoir in the first supply unit.

Abstract: In a method to operate a digital printer having multiple developer stations operated with liquid developer, and wherein a number of the developer stations participating in printing is dependent on a respective print operating mode, liquid developer is supplied from a mixing container to at least one of the developer stations. With a regulatory device a fill level of liquid developer in the mixing container is kept substantially constant depending on the print operating mode. A desired different operating value is provided for the fill level for the regulatory device depending on the operating mode.

Abstract: In a digital printer, print groups are provided each having a respective developer station using liquid developer comprising carrier fluid and toner. A supply arrangement to supply the print groups is provided with fluids and to accept used and unconsumed fluids from the print groups. The supply arrangement has a first supply unit common to all print groups to supply the print groups with the fluids, at least one reservoir containing a carrier fluid. A second supply unit per color supplies the respective print group for the color with liquid developer. The second supply unit comprises a first buffer container connected with a reservoir, the reservoir containing carrier fluid and concentrated toner as toner concentrate. A second buffer container for carrier fluid is connected with the carrier fluid reservoir in the first supply unit.

Abstract: In a method to operate a digital printer having multiple developer stations operated with liquid developer, and wherein a number of the developer stations participating in printing is dependent on a respective print operating mode, liquid developer is supplied from a mixing container to at least one of the developer stations. With a regulatory device a fill level of liquid developer in the mixing container is kept substantially constant depending on the print operating mode. A desired different operating value is provided for the fill level for the regulatory device depending on the operating mode.