Patent ID: 8740484

Claim:
An image-forming device comprising: a conveying part configured and arranged to convey a continuous recording material; an image-forming part configured and arranged to form an image on the recording material conveyed by the conveying part; a first sensor configured and arranged to detect a position of an edge surface of the recording material conveyed by the conveying part; a second sensor configured and arranged to detect a position of the edge surface of the recording material conveyed by the conveying part; a third sensor configured and arranged to detect a position of the edge surface of the recording material conveyed by the conveying part; and a control part configured to calculate a first shifting amount, a second shifting amount, and a third shifting amount based on the positions of the edge surface of the recording material, the first shifting amount being generated by movement of the recording material, the second shifting amount being generated by rotation of the recording material, the third shifting amount being generated by fluctuations in the edge surface of the recording material, the positions being simultaneously detected by the first sensor, the second sensor, and the third sensor, respectively, the second shifting amount being calculated based on the positions detected by the first sensor, the second sensor, and the third sensor, the first shifting amount being calculated based on the second shifting amount and the positions detected by the second sensor and the third sensor, and the third shifting amount being calculated based on the first shifting amount and the position detected by the second sensor.