Image forming apparatus and fixing temperature control method for the apparatus

A fixing temperature control method for an image forming apparatus which fixes a toner image onto a recording medium by heating toners by way of heating means, the toners carried on said recording medium as forming said toner image, comprising the steps of:

• outputting a timing signal associated with a timing of delivering said recording medium to said heating means;
• and
• controlling said heating means to a predetermined temperature by switching on/off the energization of said heating means based on said timing signal.

A fixing-temperature control method for an image forming apparatus which fixes a toner image onto a recording medium by heating toners by way of heating means, the toners carried on said recording medium as forming said toner image, comprising the steps of:

• outputting a periodic signal associated with a timing of delivering said recording medium to said heating means;
• and
• controlling said heating means to a predetermined temperature by adjusting an energization time of said heating means within a control period which is defined to be N or 1/N (N representing a natural number) times the period of said periodic signal.

A fixing-temperature control method for an image forming apparatus which transfers a color toner image to a recording medium, the color toner image formed by superimposing toner images of multiple different colors on top of each other on an intermediate transfer medium rotatingly movable in a predetermined direction and which fixes said color toner image onto said recording medium by heating toners by way of heating means, the toners carried on the recording medium as forming the color toner image, comprising the steps of:

• outputting a synchronous signal associated with the rotating motion of said intermediate transfer medium;
• and
• controlling said heating means to a predetermined temperature by switching on/off the energization of said heating means based on said synchronous signal.