Abstract: An image forming apparatus includes a sheet feed section, a sheet feed roller, an intermediate roller pair, an intermediate sensor, and a controller. The intermediate roller pair is provided downstream of the sheet feed roller in a conveyance direction and conveys a sheet downstream of the conveyance direction. The intermediate sensor is provided upstream of the intermediate roller pair in the conveyance direction and detects the sheet conveyed to the intermediate roller pair. The sheet feed roller feeds a leading sheet and feeds a following sheet just after the leading sheet. The controller calculates a first interval between a trailing edge of the leading sheet and a leading edge of the following sheet based on an output of the intermediate sensor. According to the first interval, the controller performs control so that the sheet feed roller and the intermediate roller pair are driven.

Abstract: An image forming apparatus includes a sheet feed section, a sheet feed roller, an intermediate roller pair, an intermediate sensor, and a controller. The intermediate roller pair is provided downstream of the sheet feed roller in a conveyance direction and conveys a sheet downstream of the conveyance direction. The intermediate sensor is provided upstream of the intermediate roller pair in the conveyance direction and detects the sheet conveyed to the intermediate roller pair. The sheet feed roller feeds a leading sheet and feeds a following sheet just after the leading sheet. The controller calculates a first interval between a trailing edge of the leading sheet and a leading edge of the following sheet based on an output of the intermediate sensor. According to the first interval, the controller performs control so that the sheet feed roller and the intermediate roller pair are driven.

Abstract: An image-forming apparatus that is capable of accurately detecting skew angle when arriving at a resist roller. In the image-forming apparatus, the resist roller feeds the printing paper to a printing unit at specified timing, and the printing unit performs printing on the printing paper. The flat-conveying section is formed between the paper-supply roller and the resist roller, and conveys the paper in a flat state. The camera takes images of the edge of the front end of the printing paper that is conveyed in the flat-conveying section. The camera-driving apparatus causes the camera to move along the flat-conveying section at the designed conveying speed of the printing paper. The skew-detection unit, based on images taken in the flat-conveying section by the camera, detects the skew angle when arriving at the resist roller as the arrival skew angle.

Abstract: An image-forming apparatus that is capable of accurately detecting skew angle when arriving at a resist roller. In the image-forming apparatus, the resist roller feeds the printing paper to a printing unit at specified timing, and the printing unit performs printing on the printing paper. The flat-conveying section is formed between the paper-supply roller and the resist roller, and conveys the paper in a flat state. The camera takes images of the edge of the front end of the printing paper that is conveyed in the flat-conveying section. The camera-driving apparatus causes the camera to move along the flat-conveying section at the designed conveying speed of the printing paper. The skew-detection unit, based on images taken in the flat-conveying section by the camera, detects the skew angle when arriving at the resist roller as the arrival skew angle.