An oscillating roller system for a beverage can decorator is driven back and forth by a cam follower. A cam body having a cam is mounted to a frame of the inker system. Three oscillating cam roller assemblies are positioned about the cam body. Rotation of the cam oscillates the cam followers for each one of the oscillating rollers. Bearings of the oscillating roller assemblies includes an inlet gallery and outlet gallery for a closed loop lubrication system. The rollers are water cooled.

The automatic heat transfer machine includes a base, an upright post and a heat transfer mechanism. The machine is rotatably connected to the base through the upright post, so that the machine can adjust. The machine comprises a shell, a driving motor, a screw, a nut, a connecting component and a heat transfer plate. The shell is provided with a space, and the driving motor, the screw, the nut and the connecting component are all installed in the space. The driving motor drives the screw to rotate. The screw is connected to the nut to change the rotary motion of the screw into the linear motion of the nut. The nut is connected to the heat transfer plate through the connecting component to drive the heat transfer plate to lift. Moreover, in use, the driving motor generates less noise, thereby improving the user experience.