Patent ID: 7916359
Filing Date: 2011-03-29
Classification: B41J,B65H

Abstract:
1. An image forming apparatus comprising: a reciprocal movement unit that reciprocally moves a carriage having a recording head in a main scan direction; a position sensor that detects a location of the carriage in the main scan direction; a conveyance unit that conveys a recording medium in a sub-scan direction; an edge detection sensor that is mounted on the carriage and that detects an edge of the recording medium; a both edge detection unit that detects positions of both edges of the recording medium from positions of the carriage detected by the position sensor when the edge detection sensor detects each edge of the recording medium; a detection start position determination unit that determines a detection start position, located outside a width of the recording medium, according to the positions of the edges of the recording medium detected by the both edge detection unit; a print control unit that controls the recording head to record data on the recording medium by moving the carriage in accordance with the detected positions of both edges of the recording medium; and a re-detection unit that moves the carriage to the detection start position during printing and that re-detects the position of the edge of the recording medium from the detection start position using the edge detection sensor.