Patent ID: 9037026
Filing Date: 2015-05-19
Classification: G03G

Abstract:
1. A fusing device comprising: a heater which generates heat when energized; a fusing rotary member which is heated by the heat from the heater; a pressing rotary member which is in pressed contact with the fusing rotary member so as to form a fusing nip through which paper having a toner image transferred thereto is passed to fuse the toner image to the paper; an adjustment mechanism which adjusts a fusing pressure under which the fusing rotary member and the pressing rotary member are in contact with each other at the fusing nip, thereby to adjust a nip width of the fusing nip; a temperature sensing member which senses temperature of the fusing rotary member, and a control portion which recognizes the temperature of the fusing rotary member based on an output from the temperature sensing member, the control portion, when the temperature of the fusing rotary member is lower than a fusing control temperature adequate for fusing of the toner image, energizing the heater to raise the temperature of the fusing rotary member up to the fusing control temperature, thereby to perform fusing warm-up operation, the control portion controlling the adjustment mechanism such that, wherein, of the first, second, and third set values, the third set value is greatest, the second set value is second greatest, and the first set value is smallest.