Patent ID: 7334519

Claim:
A rotary press comprising: a first printing unit including a pair of a first blanket cylinder and a first plate cylinder for printing a first color on one side of a printing paper and two pairs of second and third blanket cylinders and second and third plate cylinders which oppose each other with respect to the first blanket cylinder for printing the first color and a second color on the other side of the printing paper, wherein the second and third blanket cylinders contact the first blanket cylinder with a predetermined angle formed between the second and third blanket cylinders with respect to the first blanket cylinder so that the printing paper passing through the first through third blanket cylinders contacts the first through third blanket cylinders in a surface-to-surface contacting manner between a point on a circumference of the second blanket cylinder and a point on a circumference of the third blanket cylinder; a second printing unit including a pair of blanket cylinders and a pair of plate cylinders which are located in each side of the printing paper having passed the first printing unit, in order to print a second color on one side of the printing paper and print a third color on the other side thereof; and a third printing unit including a pair of a fourth blanket cylinder and a fourth plate cylinder for printing a fourth color on one side of the printing paper having passed through the second printing unit and two pairs of fifth and sixth blanket cylinders and fifth and sixth plate cylinders which oppose each other with respect to the fourth blanket cylinder for printing the third color and the fourth color on the other side of the printing paper, wherein the fifth and sixth blanket cylinders contact the fourth blanket cylinder with a predetermined angle formed between the fifth and sixth blanket cylinders with respect to the fourth blanket cylinder so that the printing paper passing through the fourth through sixth blanket cylinders contacts the fourth through sixth blanket cylinders in a surface-to-surface contacting manner between a point on a circumference of the fifth blanket cylinder and a point on a circumference of the sixth blanket cylinder, wherein a tension of the printing paper passing through the printing units is maintained to be constant, and wherein a position of a printing pin of each printing unit is consistently maintained so as to prevent a pin secession phenomenon of a printed image from occurring.