Fixing device temperature control method, fixing device, and image forming apparatus

摘要

A fixing device temperature control method includes selectively energizing at least one of a plurality of heaters that heats a fixing rotary body according to an image area on a recording medium where a toner image is formed on the recording medium, detecting a temperature of a pressing rotary body pressed against the fixing rotary body, and controlling the energized, at least one of the plurality of heaters based on the detected temperature of the pressing rotary body so as to heat the fixing rotary body to a target temperature. The image area on the recording medium corresponds to a plurality of axial heating spans on the fixing rotary body.

主权项

1. A fixing device temperature control method, comprising:
selectively energizing, via a fixing temperature controller, at least one of a plurality of heaters according to an image area on a recording medium where a toner image is formed on the recording medium, the image area corresponding to a plurality of axial heating spans on a fixing rotary body; detecting, via a temperature detector, a temperature of a pressing rotary body; changing, via the fixing temperature controller, a target temperature of the fixing rotary body based on the detected temperature of the pressing rotary body so that a temperature of the image area is substantially constant among a plurality of recording media conveyed through a fixing nip formed between the fixing rotary body and the pressing rotary body continuously; and controlling, via the fixing temperature controller, at least one of the energized plurality of heaters during a print job for forming the toner image on the plurality of recording media continuously so as to maintain the image area on the recording medium at a substantially constant temperature when the recording medium is discharged from the fixing nip.