Method of changing the mounting condition of a printing master on a printing master cylinder
A method according to the invention of changing the mounting condition, in particular of mounting or dismounting of a printing master on a printing master cylinder having a first receiving element for the leading edge and a second receiving element for the trailing edge of the printing master includes rotating the printing master cylinder at a first speed, actuating the first receiving element in at least one first phase position and actuating the second receiving element in at least one second phase position. At least between a third phase position and a fourth phase position, the printing master cylinder may be rotated at a second speed, which differs from the first speed. Due to the reduced speed, the window of time for actuating one or both receiving elements can be extended to increase the precision and reliability of the locking and release.
1. A method of changing the mounting condition of a printing master on a printing master cylinder, the printing master including a leading edge and a trailing edge, the printing master cylinder including a leading receiving element for receiving and releasing the leading edge and a trailing receiving element for receiving and releasing the trailing edge, the method comprising:
mounting a printing master including the successive steps of:
rotating the printing master cylinder at a first mounting speed;
reducing the speed of the printing master cylinder from the first mounting speed to a second mounting speed at a leading reducing speed phase position of the printing master cylinder;
closing the leading receiving element in a leading closing phase position of the printing master cylinder to hold the leading edge of the printing master, the printing master cylinder being rotated with the second mounting speed during closing of the leading receiving element;
increasing the speed of the printing master cylinder from the second mounting speed during an acceleration phase position;
reducing the speed of the printing master cylinder to a third mounting speed at a trailing reducing speed phase position; and
closing the trailing receiving element at a trailing closing phase position to hold the trailing edge of the printing master while the printing master cylinder is rotated with the third mounting speed:
dismounting the printing master including the successive steps of:
rotating the printing master cylinder at a first dismounting speed;
reducing the speed of the printing master cylinder from the first dismounting speed to a second dismounting speed at a dismount trailing reducing speed phase position of the printing master cylinder;
opening the trailing receiving element at a trailing opening phase position of the printing master cylinder to release the trailing edge of the printing master, the printing master cylinder being rotated with the second dismounting speed during opening of the trailing receiving element; and
increasing the speed of the printing master cylinder from the second dismounting speed during a dismount acceleration phase position.
2. The method recited in claim 1 , further comprising the successive steps of:
reducing the speed of the printing master cylinder to a third dismounting speed at a dismount leading reducing speed phase position after the dismount acceleration phase position; and
opening the leading receiving element at a leading opening phase position to release the leading edge of the printing master.
3. The method according to claim 1 , wherein the printing master is fed to a printing master changing device as the printing master is dismounted or the printing master is taken from a printing master changing device as the printing master is mounted.
4. The method according to claim 1 , wherein during mounting of the printing master, the speed is reduced after a holding element of the printing master has been disengaged and before the trailing edge is inserted into the trailing receiving element.
5. The method according to claim 1 , wherein during dismounting of the printing master, the speed is reduced to a third dismounting speed after a part of the printing master is removed from the printing master cylinder and the speed is increased after the leading receiving element is opened.
6. The method according to claim 5 , wherein the speed is increased essentially to the first dismounting speed.
7. A method of changing printing masters on a printing master cylinder with a first printing master being dismounted from the printing master cylinder and a second printing master being mounted to the printing master cylinder, wherein the dismounting of the first printing master or the mounting of the second printing master is carried out in accordance with a method as set forth in claim 1 .