| 摘要 |
<p>PROBLEM TO BE SOLVED: To accurately detect a transfer paper wound on an image carrier by comparing signals from a detecting sensor having spectral sensitivity with prescribed reference values and executing arithmetic processing, based on the results of the comparison, to decide the presence of paper jamming. SOLUTION: A detecting means 60 is of a means for detecting the fact that the jamming occurs in the image carrier or not and constituted to include a detecting sensor part 61, a comparing circuit part, 62 and a paper jamming deciding part. 63. The detecting sensor part 61 is provided with a detecting sensor having at least two or more different kinds of spectral sensitivity in a wavelength area in the spectral reflectance distribution of one or plural colors of toner used. Moreover, the comparing circuit part 62 is provided with a comparing circuit for comparing signals from the detecting sensor with the prescribed reference values, respectively Further, the jamming deciding part 63 executes the arithmetic processing, based on the respective results of the comparing circuit, to decide the presence of the jamming. At this time, the jamming deciding part 63 decides that the jamming occurs, when all the compared values of the comparing circuit part 62 are higher than the threshold of a reference value.</p> |
