Fixing device in copying machine

Abstract

Abstract PURPOSE: To enable a pressure roller to make pressure contact, release and pressure adjustment with respect to a heating roller through simple control by connecting support members which support the pressure roller detachably from a heating roller to a driving device by way of a fluid coupling. CONSTITUTION: When a motor 1 runs, a heating roller 6 revolves and at the same time, a fluid coupling 3 revolves while generating the transmission torque proportional to the revolving speed of the motor 1 and therefore the pulleys 9, 10 connected to the shaft 11 also revolve in the same direction, thus winding up wires 16, 17. As a result, a pressure roller 5 is pulled up to make pressure contact to the heating roller 6, then the pressure roller revolves together with the heating roller 6. When the motor 1 further continues to rotate, the pressure of fixing roller pair 5, 6 gradually increases but when it reaches the pressure obtainable by the maximum transmission torque that can be generated by the fluid coupling 3, said pressure does not longer increase and maintains a fixed pressure contact state. When the motor 1 stops running, the transmission torque of the fluid coupling 3 gradually decreases and the pressure roller 5 is gradually lowered by the braking force of the fluid coupling 3 owing to its gravity. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Takeshi Shimada
• 👤 Sadaichi Takigawa
• 👤 Masaaki Tanaka
• 👤 Yutaka Ouchi

Bibliographic Details