Rotary machine minders fasten cylindrical surfaces, which do printing, into fixed positions, then set the rotary machine in motion.
Rotary machine minders ensure that stereotypes or lithographic metal plates fit properly and make contact with the paper evenly. They place huge paper rolls into the rotary machine, then set the ink rollers and fill the ink holders. They make proofs to ensure that all letters and images print properly onto the paper. They examine the proofs and adjust the machine and the ink until the printing is done properly and evenly. They also test the colour and ink quantities.
Rotary machine minders check their machines at regular intervals throughout the printing process to ensure accuracy and quality of printing.