Abstract: Provided are a method for operating a CIJ printer with an optical monitoring means (80) having the steps of generating a bitmap (90,180) of the printed image to be printed, sequential controlling of charge electrodes (25) and/or deflection electrodes (30) of the CIJ printer, in order to generate dots or groups of dots of the bitmap (90,190) by applying ink droplets (12) to a substrate (100) to be printed and thus to sequentially apply a real printed image (195) to the substrate (100), capturing the real printed image (195) applied to the substrate (100) with the optical monitoring means (80), and automated comparing of the bitmap (90,190) of the desired printed image and of the real printed image (195) which has been applied to the substrate (100) and has been captured with the optical monitoring means (80), wherein the bitmap (90,190) of the desired printed image and the real image applied to the substrate (100) are automatically compared either on the basis of rows or columns of the bitmap (90,190) or on th

Abstract: A numbering machine (100, 200) includes a housing (101, 201) and a wheel axle (107), arranged in a removable manner in the housing (101, 201), with a plurality of number wheels (108), which can each be moved individually and are arranged in for rotation. The number wheels (108) can be driven by a gearwheel (114). A drive shaft (111, 112), with a drive pinion (113), is connected to the drive shaft (111, 112) for each number wheel (108) which can be driven by means of a gearwheel (114). A displaceable drive shaft (112) can be transferred from an operating position, in which the number wheel (108) is driven by a gearwheel (114) by the displaceable drive shaft (112), to a removal position, in which the displaceable drive shaft (112) releases the number wheel (108) which can be driven by means of a gearwheel (114) and the wheel axle (107).