| 摘要 |
An image forming apparatus includes a sheet size detection device including a sheet width direction regulating member, a sheet conveyance direction regulating member, two levers, a detection sensor, and a pattern supplementing device. The levers each have a concavo-convex pattern and interlock with the regulating members, respectively, and are superimposed to have the same center of rotation and the same locus formed by a leading end of the concavo-convex pattern. The concavo-convex pattern of at least one of the levers is shaped to prevent, in a detection pattern, erroneous detection attributed to positional displacement of the concavo-convex pattern. The detection sensor including push switches detects the sheet size according to a combined concavo-convex pattern formed by the superimposed levers. The pattern supplementing device supplements the concavo-convex pattern of the at least one lever to prevent, in another detection pattern, erroneous detection attributed to the shaping of the concavo-convex pattern.
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