IMAGE FORMING DEVICE AND CONVEYANCE CONTROL METHOD

To detect movement amounts of a recording medium with high accuracy to improve a printing quality.SOLUTION: An image forming device comprises: a conveying mechanism for a recording medium; a printing part that performs printing on the recording medium; an original point detecting part provided in the conveying mechanism; a movement amount calculating part that calculates movement amounts of the recording medium on the basis of correlation between photographed images photographed for each predetermined time by a photographing part, and cumulatively processes the calculated movement amounts sequentially to calculate a cumulative movement amount; a correcting part that performs operation to match the cumulative movement amount with a reference movement amount of the recording medium corresponding to a predetermined cycle obtained from a mechanical configuration of the conveying mechanism, for each predetermined cycle of the conveying mechanism that is detected by the original point detecting part; and a control part that controls the conveying mechanism on the basis of the cumulative movement amount corrected by the correcting part so that the recording medium is conveyed and controlled, and controls the printing part so that printing is performed on the recording medium conveyed and controlled.SELECTED DRAWING: Figure 12 【課題】記録媒体の移動量を高精度に検出して、印刷品質の向上を図る。【解決手段】記録媒体の搬送機構と、記録媒体に印刷を行う印刷部と、搬送機構に設けられた原点検出部と、撮像部により所定時間毎に撮像された撮像画像の相関に基づいて、記録媒体の移動量を算出すると共に、算出した各移動量を、順次、累積処理して累積移動量を算出する移動量算出部と、原点検出部で検出される搬送機構の所定周期毎に、搬送機構の機械的構成から得られる所定周期分の記録媒体の基準移動量に、累積移動量を一致させる動作を行う補正部と、補正部で補正された累積移動量に基づいて、搬送機構を制御して、記録媒体を搬送制御すると共に、搬送制御される記録媒体に対して、印刷部を制御して印刷を行う制御部と、を有する。【選択図】図１２