| 摘要 |
The invention provides a low-cost sheet thickness detection device which has high sheet follow-up capability, has no influence on the conveyance of a sheet of paper, receives no influence of vibration and the like when mounted in a central position of the sheet in the width direction thereof, and allows complicated operations to be avoided when the conveying path is to be opened, and provides a sheet conveying device and an image forming apparatus. The sheet thickness detection device is provided in a sheet conveying path formed by a pair of conveyance guides opposite to each other to detect the thickness of a sheet conveyed in said sheet conveying path. It includes a pair of levers which are mounted on said pair of conveyance guides, respectively, and each of which is swingably pivoted at one end thereof to allow opening and closing motions of another end thereof about said end serving as a base point, the levers being disposed to allow a sheet to be inserted in a gap between said levers by the opening motion of said lever and a swing amount detection unit provided at the other end of the lever for detecting the thickness of the sheet by detecting the amount of the swing of said levers when the sheet is inserted.
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