Patent ID: 6848361
Filing Date: 2005-02-01
Classification: B41F,B41P

Abstract:
1. Control device to control printing drums for a printing machine with at least a first sensor ( 12 ) to detect sheets ( 5 ) on a conveyor belt ( 1 ), printing cylinders including an illustration drum ( 23 ) and an intermediate drum ( 25 ) to apply printing images to sheets ( 5 ) in a nip ( 4 ) between the intermediate drum ( 25 ) and a nip roller ( 27 ), said control device comprising: a first spacing, which is defined between a position determined by a signal of the first sensor ( 12 ) on the conveyor belt ( 1 ) and the nip ( 4 ) of the intermediate drum on the conveyor belt ( 1 ), corresponding to a whole-numbered multiple of the circumference of a nip roller ( 27 ), and with different angular velocities of said illustration drum ( 23 ) and said intermediate drum ( 25 ) of the printing machine, a second spacing, which is defined between a position determined by the signal of a sensor ( 12 ) and the nip ( 4 ) of the intermediate drum ( 25 ) on the conveyor belt ( 1 ) with an angular position φ 1 of the illustration drum ( 23 ), and a third spacing, which is defined between a position determined by the signal of a sensor ( 12 ) and the nip ( 4 ) of the intermediate drum ( 25 ) on the conveyor belt ( 1 ) with an angular position φ 2 of the illustration drum ( 23 ), corresponding to a whole-numbered multiple of the circumference of the nip roller ( 27 ).