Patent ID: 8948625
Filing Date: 2015-02-03
Classification: G03G

Abstract:
1. An image foaming apparatus comprising: a fixing device configured to thermally fix an unfixed image on a recording sheet by causing the recording sheet with the unfixed image formed thereon to pass through a nip formed by a pressing against an outer circumferential surface of all heating rotating body that has a resistance heating layer; a temperature measuring unit configured to measure temperatures of the resistance heating layer in a plurality of measurement that are set by sectioning the outer circumferential surface of the heating rotating body along a rotational axis direction of the heating rotating body; an information obtaining unit configured to obtain information indicating temperature changes in the measurement regions in one rotational period of the heating rotating body, by sampling the temperatures measured by the temperature measuring unit during rotation of the heating rotating body; and an abnormality judging unit configured to judge whether or not an abnormality has occurred in the resistance heating layer in accordance with a result of comparison of the information obtained by the information obtaining unit, the comparison being made between measurement re ions in each combination of measurement re ions in a state where one or more combinations of measurement regions have been set by using all measurement regions of a paper-passing region in the nip and one or more combinations of measurement regions have been set by using all measurement regions of a non-paper-passing region in the nip, wherein each combination of measurement regions is a pair of measurement regions, and wherein the recording sheet is transported with reference to a center of a width of a sheet transportation path, and the two measurement regions in each combination of measurement regions are symmetrical with respect to the center of the width of the sheet transportation path in the nip.