Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
232 words
A fixing and heating device of an electrostatic copying apparatus for fixing a toner image onto a copy paper sheet, by transporting the copy paper sheet having the toner image through a set of fixing rollers which are a heating roller and a press roller and have temperature suitable for fixing, characterized by a temperature detecting element 58 for detecting a temperature H of the fixing rollers 34, 35, a heater 33 for heating the fixing rollers 34, 35, means for driving the fixing rollers 34, 35 to rotate at a speed suitable for the fixing, and means for controlling the means for driving the fixing rollers 34, 35 so as to energize the heater 33 in response to closing of a power switch and so as to drive the means for driving the fixing rollers 34, 35 in response to an output of the temperature detecting element 58 from the time when the temperature H of the fixing rollers 34, 35 reaches a predetermined temperature H3 to the time when the temperature H of the fixing rollers 34, 35 reaches a temperature H2 suitable for fixing, and while copying operation is going on after the temperature H of the fixing rollers 34, 35 has reached the temperature H2,,wherein the temperature H3 is the same as or higher than a softening temperature H1 of toner and is lower than the temperature H2.
Claim 2
Dependent Claim
232 words
A fixing and heating device of an electrostatic copying apparatus for fixing a toner image onto a copy paper sheet, by transporting the copy paper sheet having the toner image through a set of fixing rollers which are a heating roller and a press roller and have temperature suitable for fixing, characterized by a temperature detecting element 58 for detecting a temperature H of the fixing rollers 34, 35, a heater 33 for heating the fixing rollers 34, 35, means for driving the fixing rollers 34, 35 to rotate at a speed suitable for the fixing, and means for controlling the means for driving the fixing rollers 34, 35 so as to energize the heater 33 in response to closing of a power switch and so as to drive the means for driving the fixing rollers 34, 35 in response to an output of the temperature detecting element 58 from the time when the temperature H of the fixing rollers 34, 35 reaches a predetermined temperature H3 to the time when the temperature H of the fixing rollers 34, 35 reaches a temperature H2 suitable for fixing, and while copying operation is going on after the temperature H of the fixing rollers 34, 35 has reached the temperature H2,,wherein the temperature H3 is the same as or higher than a softening temperature H1 of toner and is lower than the temperature H2.
Claim 3
Dependent Claim
54 words
A fixing and heating device of an electrostatic copying apparatus according to claim 1, characterized in that the temperature detecting element 58 is attached to the periphery of the heating roller 34 at a central position in the axial direction of the heating roller 34 at the opposite side of the press roller 35.
Claim 4
Dependent Claim
71 words
A fixing and heating device of an electrostatic copying apparatus according to claim 1, characterized in that the means for controlling the means for driving the fixing rollers 34, 35 controls the means for driving the fixing rollers34, 35 in response to a signal from the power switch, an output from the temperature detecting element 58 and a signal from a print button 60 pushed at the beginning of copying operation.
Claim 5
Dependent Claim
25 words
A fixing and heating device of an electrostatic copying apparatus according to claim 2, characterized in that the temperature detecting element 58 is a thermistor.