Method to operate a digital printer and determine the toner concentration, as well as an associated digital printer

摘要

In a method or digital printer to print a recording material with toner particles applied with a liquid developer, toner concentration of the liquid developer is determined via measurement with aid of ultrasonic pulses. At least one ultrasonic pulse is generated by discharging an ultrasound emitter charged with a charge voltage. The ultrasonic pulse permeates the liquid developer and is received by an ultrasound receiver which generates a reception signal corresponding to the received ultrasonic pulse. With a control device, the charge voltage is regulated to a value such that a representative value of the reception signal corresponds to a predetermined desired value. The toner concentration is determined from the regulated charge voltage.

主权项

1. A method to operate a digital printer to print a recording material with toner particles that are applied with aid of a liquid developer, comprising the steps of:
determining toner concentration of the liquid developer via measurement in a measurement cell with aid of at least one ultrasonic pulse; generating said at least one ultrasonic pulse by discharging an ultrasound emitter charged with a charge voltage, said ultrasonic pulse permeating the liquid developer and being received by an ultrasound receiver which generates a reception signal corresponding to the received ultrasonic pulse; with a control device, regulating the charge voltage based on the reception signal to a value such that a representative value of the reception signal corresponds to a predetermined desired value; and determining the toner concentration from the regulated charge voltage.