Conveyance device and image forming apparatus

An image forming apparatus comprising:

• an image forming device configured to form an image on a recording medium;
• and
• a conveyance device configured to convey the recording medium,
• the conveyance device including:
• a first rotator configured to convey the recording medium in a recording medium conveyance direction;
• a heater configured to heat the first rotator;
• temperature detectors consisting of a first temperature detector configured to detect a temperature of the heater at a first position, and a second temperature detector configured to detect a temperature of the heater at a second position;
• a second rotator configured to press against the first rotator, the second rotator including an elastic layer;
• and
• a recording medium detector consists of a first detector configured to detect the recording medium, a total number of the first detector being less than a number of the temperature detectors,
• the first temperature detector being separated from a center position of the elastic layer of the second rotator farther than the second temperature detector is in an orthogonal direction perpendicular to the recording medium conveyance direction,
• the first temperature detector being separated from the center position for a first length in the orthogonal direction,
• the first temperature detector being disposed in a first span that is defined by the center position in the orthogonal direction,
• the first detector being disposed in a second span that is defined by the center position in the orthogonal direction and is opposite to the first span,
• the first detector being separated from the center position for a second length smaller than the first length in the orthogonal direction,
• the first detector being disposed in a minimum recording medium conveyance span where the recording medium having a minimum width in the orthogonal direction is conveyed, the minimum width being available in the conveyance device.