IMAGE FORMING APPARATUS AND IMAGE ADJUSTMENT METHOD

To provide an image forming apparatus that can prevent a deviation in an image forming position between a front face and a rear face even when there is a variation in shape of a recording material.SOLUTION: An image forming apparatus has: an information acquisition unit that acquires recording material detection information from a detection sensor; a length calculation unit that calculates the lengths of the sides of the recording material based on the recording material detection information; an angle calculation unit that calculates the angles at the apices of the recording material based on information on the positions of the ends of the recording material; a shape calculation unit that calculates the shape of the recording material from the lengths of the sides and the angles at the apices; and an image adjustment unit that adjusts an image forming position to locate an image to be formed on the recording material at a predetermined position based on the shape of the recording material.SELECTED DRAWING: Figure 32 【課題】記録材の形状にばらつきがある場合にも表面と裏面とで画像形成位置のずれを抑制することが可能な画像形成装置を提供する。【解決手段】検知センサーから記録材の検知情報を取得する情報取得部と、記録材の検知情報に基づいて、記録材の辺の長さを算出する長さ算出部と、記録材の端部の位置情報に基づいて、記録材の頂点における角度を算出する角度算出部と、辺の長さと頂点における角度とから記録材の形状を算出する形状算出部と、記録材の形状に基づいて、記録材に形成する画像が所定の位置となるように画像形成位置の調整を行う画像調整部とを有する画像形成装置を構成する。【選択図】図３２