Image forming device capable of changing pressing force between fixing members
   
   

When fixing images onto normal sheets of paper, the pressing force between a pressing roller and a thermal roller of a fixing unit is designated by the urging force of only a first spring. On the other hand, when fixing images onto thick sheets, the pressing force is designated by the urging force of the first spring and the urging force of a second spring, which operates against the urging force of the first spring.

 
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