Abstract: A heat fixing device for a image reproduction machine includes a heat roller having a heat source for heat fixing a toner image on a copy paper, a temperature sensing element for sensing the temperature of the heat roller, and a temperature control element responsive to the output of the temperature sensing element for controlling the power supply to the heat source. The temperature sensing element and the temperature control element are integrally combined.

Abstract: A dual scanning mode copying machine capable of selectively operating under a primary scan mode, in which a document placed on a stationary document support is scanned by an optical system being moved below the document support, and under a secondary scan mode in which a document fed through a document feeder is moved relative to and above the optical system. The machine includes a detector for detecting the insertion of the document into the document feeder. When this detector detects the insertion of the document into the document feeder, the optical system is brought to a stationary position immediately below the document feeder and next to the document support.