Thermostat and Sensor Positioning for Accurate Temperature Detection

The patent applies local quality by positioning the temperature sensor's detection area specifically at the center of the heating roller, rather than allowing detection across the entire periphery. This localized detection ensures that the sensor measures temperature at the most representative location, avoiding the temperature differences that occur at the edges where the heating roller contacts the recording medium. The center position provides consistent temperature readings regardless of medium size or contact variations.

The thermostat is positioned to detect temperature specifically at the center of the heating roller, providing localized and accurate temperature measurement. This center positioning ensures that the thermostat receives reliable temperature data that accurately reflects the heating roller's actual temperature, preventing malfunction even when small-sized recording media are conveyed. The localized detection at the center avoids the temperature variations at the periphery that would cause unreliable thermostat operation.

The opening for temperature detection is positioned at the center of the heating roller, creating a localized detection zone that provides accurate temperature measurements. This center positioning ensures that the detection area, while focused, captures the representative temperature of the heating roller without being influenced by the temperature gradients that occur at the periphery. The localized center detection maintains both adequate detection area and high measurement precision.