Patent ID: 8228512
Filing Date: 2012-07-24
Classification: B41J

Abstract:
1. An image forming apparatus that forms an image based on a control signal from an image processing controlling unit that processes input image information into image data, the apparatus comprising: a carriage that moves in a main scanning direction in accordance with the control signal; a conveyance unit that conveys a recording medium in a sub-scanning direction; an output detection unit that detects motor outputs of the carriage at any plural points when the carriage moves at a constant speed; and a jamming determination unit that compares an average value of the motor outputs of the carriage between the plural points with a predetermined tolerance, compares a most frequent value of the motor outputs of the carriage between the plural points with a predetermined tolerance, or compares a difference between a maximum value and a minimum value of the motor outputs of the carriage between the plural points with a predetermined tolerance, thereby determining a conveyance failure.