Heat roll for electronic copying machine

Abstract

Abstract PURPOSE:To accelerate the rise in temperature of the center part of a roll while suppressing the temperature rise of end surface parts which is more than required by making the insulating layer thicker at roll end parts than at the center part. CONSTITUTION:The heat roll for an electronic copying machine which is heated directly is formed of a cylindrical core body 1, and a resistance layer 4 is arranged on its external surface across a coupling layer 2 and the insulating layer 3; and a protection layer 5 is provided on the external surface of the resistance layer 4, and annularly formed electrode 6 are provided nearby the end parts of the core body 1 and connected electrically to the resistance layer 4. When electric feeding brushes 7 slide on the electrodes 6 and a specific voltage is applied between the feeding brushes 7, the resistance layer 4 between the electrodes 6 and 6 generate heat to fix thermally a toner image on transfer paper contacting the heat roller. The thickness t3 of the insulating layer 3 is 300mum at the center part and 400mum at the end parts and the insulating layer is thicker at the end parts, so the temperature rise is suppressed at the end parts more than at the center part.

Inventors

• 👤 Ryoichi Shibata
• 👤 良一 柴田
• 👤 Toru Iwasa
• 👤 徹 岩佐
• 👤 Tsutomu Iimura
• 👤 飯村　勉

Bibliographic Details