A decorator (10) for printing onto cylindrical structures (18) has a plurality of inkers (12). Each inker (12) has a pair of opposing frame plates (40, 48). A printing plate (204) is affixed to a printing plate cylinder (200) carried by a rotational printing plate cylinder shaft (202). The printing plate shaft (202) is disposed between the opposing frame plates (40, 48). A main shaft (38) supports the inker (12) on the decorator (10) such that the pair of opposing frame plates (40, 48) are slidable along a length of the main shaft (38). A lateral adjustment servomotor (220) acts on a corresponding inker (212) to impart a movement by the inker (12) along the length of the main shaft (38).

In some examples, a printing device includes a first print drum comprising a first ring gear defined on a surface of the first print drum, a second print drum comprising a second ring gear defined on a surface of the second print drum, a rotatable drive shaft, and pinion gears to engage the first ring gear and the second ring gear, wherein rotation of the drive shaft causes the pinion gears to interact with the first and second ring gears to rotate the first print drum and the second print drum at different angular velocities.

In some examples, a printing device includes a first print drum comprising a first ring gear defined on a surface of the first print drum, a second print drum comprising a second ring gear defined on a surface of the second print drum, a rotatable drive shaft, and pinion gears to engage the first ring gear and the second ring gear, wherein rotation of the drive shaft causes the pinion gears to interact with the first and second ring gears to rotate the first print drum and the second print drum at different angular velocities.

A differential printing device includes a first print drum including a first ring gear defined on an outside surface of the first print drum. The device also includes a second print drum including a second ring gear defined on an outside surface of the second print drum. A drive shaft that rotates the first print drum and the second print drum has a number of pinion gears to engage the first ring gear and the second ring gear. The number of pinion gears rotate the first print drum and the second print drum at different angular velocities.

A decorator (10) for printing onto cylindrical structures (18) has a plurality of inkers (12). Each inker (12) has a pair of opposing frame plates (40, 48). A printing plate (204) is affixed to a printing plate cylinder (200) carried by a rotational printing plate cylinder shaft (202). The printing plate shaft (202) is disposed between the opposing frame plates (40, 48). A main shaft (38) supports the inker (12) on the decorator (10) such that the pair of opposing frame plates (40, 48) are slidable along a length of the main shaft (38). A lateral adjustment servomotor (220) acts on a corresponding inker (212) to impart a movement by the inker (12) along the length of the main shaft (38).