Inkjet image recorder and method for correction of belt conveyance

An inkjet image recorder that relatively moves a recording material and a recording head to thereby record an image on the recording material, the inkjet image recorder comprising:

• a belt conveyance mechanism having an endless belt that is wound on a pair of rollers to thereby form an upper traveling part and a lower traveling part, and a motor that rotates one of the pair of rollers to thereby move the endless belt in a specified direction;
• position detecting device adapted to detect a specified position on the endless belt;
• measurement device adapted to measure a rotation rate of at least one roller of the pair of rollers;
• a controller comprising a processor and a memory, said controller being programmed so as to
• calculate a position, from a measurement value measured by the measurement device, on a basis of a moving distance of the specified position, the moving distance being detected by the position detecting device, to specify a position on the endless belt;
• calculate a conveyance correction amount, during the movement of the endless belt, in an error-causing region where an conveyance error is caused by the endless belt, on a basis of the conveyance error, for correcting a conveyance error of the endless belt;
• calculate a corrected conveyance rate by adding the conveyance correction amount to a position on the endless belt, the position being related to the error-causing region, to thereby calculate a corrected conveyance rate;
• and
• calculate a driving rate, to adjust a driving rate of the motor according to the corrected conveyance rate;
• wherein
• the error-causing region is a region including a position on the endless belt, the position being where a joint of a belt member of the endless belt is brought into abutting contact with any of the pair of rollers or separated from any of the pair of rollers.