A method for mounting and dismounting a doctor blade chamber in a support holder on a printing unit as well as an apparatus in which the doctor blade chamber is placed in the support holder in a mounting position and subsequently is brought in contact with a roller, preferably, an anilox roller, in a position of operation. The method and the apparatus advantageously have the doctor blade chamber disposed with the opening upwards in the support holder, preferably in a horizontal position or in a position at such a small angle that ink does not run out of the doctor blade chamber, and is brought into a position under the roller, after which the doctor blade chamber is brought into contact with the roller and pivoted about an axis coinciding with the rotary axis of the roller, into the position of operation.