Patent ID: 7634208

Claim:
A driving device comprising: a conveying portion which conveys a recording medium; a driving portion which drives a fixing-unit for fixing the recording medium conveyed by the conveying portion; a detection portion which detects a loop of the recording medium between the conveying portion and the fixing-unit; and a control portion which, in a first control time period starting from the time when the recording medium is present at said fixing-unit, controls a driving speed of said driving portion in accordance with a detecting result of said detection portion so that an amount of the loop of the recording medium becomes a predetermined amount, and in a second control time period after the first control time period, stops controlling the driving speed of said driving portion in accordance with a detecting result of said detection portion, calculates a plurality of target speeds based on the driving speed of said driving portion in the first control time period, and controls said driving portion using the plurality of calculated target speeds.