Patent ID: 8444538

Claim:
An impression roller for gravure printing for the use with an electrostatic printing aid, comprising: an axis member or a shaft, a steel core adjoining axially thereto under formation of a respective end, an electrically insulating inner layer extending around said core in a radial direction, an electrically semi-conductive outer layer adjoining an outside of said impression roller, and an electrically highly conductive conductor layer arranged between the electrically semi-conductive outer layer and said electrically insulating inner layer, wherein said conductor layer is encapsulated in an electrically insulated manner from the outside, said impression roller is provided with an electric or electronic encapsulated circuit electrically insulated from the outside and having two poles, which, in a flow direction of the electric current from one pole to another pole is of low resistance in normal operation and in an opposite flow direction is of high resistance in the event of a failure, and an inner pole of said circuit is connected to said conductor layer by way of an inner connection and an outer pole of said semiconductor is connected to an outer connection of said impression roller for connecting to a generator.