Belt device, fixing device, and image forming apparatus

A fixing device comprising:

• an endless belt;
• a heater to heat the belt;
• a rotary driver contacting an outer circumferential surface of the belt to drive and rotate the belt;
• an opposed belt support disposed opposite the rotary driver and in contact with an inner circumferential surface of the belt;
• a rotary belt support disposed opposite the rotary driver via the opposed belt support and in contact with the inner circumferential surface of the belt;
• a belt support holder to hold the opposed belt support and the rotary belt support to retain a predetermined interval between the opposed belt support and the rotary belt support;
• and
• a biasing assembly to press against the belt support holder to move the opposed belt support and the rotary belt support collectively with respect to the rotary driver and bias the opposed belt support against the rotary driver.

An image forming apparatus comprising:

• an image forming device to form a toner image;
• and
• a fixing device disposed downstream from the image forming device in a recording medium conveyance direction to fix the toner image on a recording medium,
• the fixing device including:
• an endless belt;
• a heater to heat the belt;
• a rotary driver contacting an outer circumferential surface of the belt to drive and rotate the belt;
• an opposed belt support disposed opposite the rotary driver and in contact with an inner circumferential surface of the belt;
• a rotary belt support disposed opposite the rotary driver via the opposed belt support and in contact with the inner circumferential surface of the belt;
• a belt support holder to hold the opposed belt support and the rotary belt support to retain a predetermined interval between the opposed belt support and the rotary belt support;
• and
• a biasing assembly to press against the belt support holder to move the opposed belt support and the rotary belt support collectively with respect to the rotary driver and bias the opposed belt support against the rotary driver.