METHOD TO ADJUST THE PRINT QUALITY OF PRINT IMAGES IN AN ELECTROPHORETIC DIGITAL PRINTER

摘要

In a method to adjust print quality of print images in an electrophoretic digital printer with at least one print group, the print group generates charge images of the print images. The charge images are developed with a developer station into toner images using liquid developer having carrier fluid and toner. The toner images are transfer-printed onto a carrier medium in a transfer station. A first control marking is generated on the recording medium with elements of the first control marking being aligned transverse to a printing direction. A shape of the elements of the first control marking is measured to generate a first measurement signal. The first measurement signal is compared with a predetermined nominal value, and given a difference, an adjustment signal is generated via which an amount of the carrier fluid in the liquid developer is modified so that the first measurement signal approaches the predetermined nominal value.

主权项

1. A method to adjust print quality of print images in an electrophoretic digital printer with at least one print group, comprising the steps of:
generating with the print group with an electrophotography station of the print group charge images of the print images; with a developer station, developing the charge images into toner images using liquid developer having carrier fluid and toner; transfer-printing the toner images onto a recording medium in a transfer station; with said print group generating on the recording medium a first control marking with elements of the first control marking being aligned transverse to a printing direction; measuring a shape of the elements of the first control marking to generate a first measurement signal; and comparing the first measurement signal with a predetermined nominal value, and given a difference between the first measurement signal and the predetermined nominal value generating an adjustment signal via which an amount of the carrier fluid in the liquid developer is modified so that the first measurement signal approaches the predetermined nominal value.