| 摘要 |
A sheet material information-detecting apparatus is provided which is capable of detecting the type of a sheet material even if the sheet material is anisotropic. When recording paper sheet P is fed, feed rollers 1 a and 1 b are moved to narrow the nip of the rollers and front edge of recording paper sheet is pushed thereto to correct the oblique feed. Thereafter, external force is applied to recording paper sheet P by external force applying member 2 . A signal based on the external force is detected by signal detecting means 3, and sheet material information-acquiring means 5 identifies the type of the recording paper sheet. Owing to the oblique feed correction, the type of the sheet material can be identified precisely even if the sheet material is anisotropic.
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