Temperature control system

An electrophotographic printer in which a toner image is fixed onto a recording medium by means of a heat roller, said printer comprising:

• switching means for switching the setting of the temperature of said heat roller between an operable range and a standby range, the temperature of said heat roller being held in said operable range when printing is executed, while the temperature of said heat roller is held in said standby range, which is lower than said operable range, when printing is not executed;
• select means for selecting said operable range or said standby range;
• and
• control means for raising the temperature of said heat roller to the upper limit of said operable range before the temperature of said heat roller is lowered to said standby range when said standby range is selected by said select means.

A temperature control system employed in a electrophotographic printer for controlling the temperature of a heat roller, said temperature control system comprising:

• first means for keeping the temperature of said heat roller in a predetermined operable range, said first means being actuated when printing is executed;
• second means for keeping the temperature of said heat roller in a predetermined standby range, said second means being actuated when printing is not executed, the temperatures of said standby range being lower than said operable range;
• and
• control means for raising the temperature of said heat roller up to the upper limit of said operable range before said first means is switched to said second means when printing is terminated.

An electrophotographic printer in which a toner image is fixed onto a recording medium by means of a heat roller, said printer comprising:

• first means for keeping the temperature of said heat roller in a predetermined operable range, said first means being actuated when printing is executed;
• second means for keeping the temperature of said heat roller in a predetermined standby range, said second means being actuated when printing is not executed, the temperatures of said standby range being lower than of said operable range;
• and
• control means for raising the temperature of said heat roller up to the upper limit of said operable range before said first means is switched to said second means when printing is terminated.