Powered chuck-bearing group for a printing machine

1. A motorized chuck-bearing group for a printing machine, wherein the chuck-bearing group is powered by a brushless motor, comprising a casing wherein a stator coil and a rotor are arranged, the rotor is controlled both in velocity and activation times by means of a control circuit comprising an encoder device, the motor further comprising a shaft that supports peripherally-distributed permanent magnets and the shaft is coupled internally of the casing to the encoder device, and the shaft extends outside of the casing to support a chuck that rotates an object to be printed.

2. The motorized chuck-bearing group of claim 1 , wherein the shaft is hollow and is coupled via a pneumatic distributor for creating a depression.

3. The motorized chuck-bearing group of claim 1 , wherein the shaft is supported to the casing by means of two roller bearings, a first roller bearing being located in proximity of an open end of the casing, a second roller bearing being located internally in the casing, and the casing supporting the stator circuit of the motor between the roller bearings.

4. The motorized chuck-bearing group of claim 3 , wherein the shaft projectingly extends beyond the second roller bearing to support the encoder device internally of the casing.

5. The motorized chuck-bearing group of claim 3 , wherein the motor shaft is axially hollow and extends beyond the casing on the encoder side, wherein the shaft is connected via a rotating distributor under depression.

6. The motorized chuck-bearing group of claim 5 , wherein the hollow motor shaft is constructed from a plurality of aligned portions.

7. The motorized chuck-bearing group of claim 5 , wherein the aligned portions of the shaft are united by screw coupling to one another.