The invention concerns a device for transmitting a rotational movement comprising a flexible shaft and a sheath inside which the flexible shaft is housed, said sheath being arranged in order to allow the rotation of said shaft inside said sheath. The illumination electron-optics is configured to form an illumination electron beam. The shunt resistor is encapsulated in the case, and the busbar has an electrode exposed to a sealed inner room of the case. In the plate 22 is formed a through-hole 25 larger than the outer diameter of the roller 24, and to this through-hole 25 is detachably fit-secured a plug, which protects the dislodgement of the roller 24. The inputoutput circuits of the one and another signal processing circuits can perform transmission of a signal of the predetermined frequency band even when any one of transmission media having mutually different characteristics is mediated. A Web print request to the digital copier by the user is executed through a print utility which is operating on a client.