Medium conveyance device, control method, and control program

A medium conveyance apparatus comprising:

• a storage device;
• a feed roller to feed a sample medium;
• and
• a processor to
• detect an amount of slant of the fed sample medium,
• detect region information of a region in which overlap has occurred in the fed sample medium,
• correct the detected region information based on the amount of slant,
• store the corrected region information in the storage device, and
• determine that multi-feed of the medium has occurred if the region information detected for the medium fed after the corrected region information has been stored does not correspond to the stored region information, and determine that multi-feed has not occurred if the region information detected for the medium fed after the corrected region information has been stored corresponds to the stored region information.

A method for determining multi-feed, the method comprising:

• storing in advance region information of a predetermined region in a medium, in a storage device;
• feeding the medium, by a feed roller;
• detecting an amount of slant of the fed medium;
• detecting region information of a region in which overlap has occurred in the fed medium;
• correcting the detected region information based on the amount of slant;
• and
• determining that multi-feed of the medium has occurred if the corrected region information does not correspond to the stored region information and determining that multi-feed of the medium has not occurred if the corrected region information corresponds to the stored region information.

A method for determining multi-feed, the method comprising:

• feeding a sample medium by a feed roller;
• detecting an amount of slant of the fed sample medium;
• detecting region information of a region in which overlap has occurred in the fed sample medium;
• correcting the detected region information based on the amount of slant;
• storing the corrected region information in a storage device;
• and
• determining that multi-feed of the medium has occurred if the region information detected for the medium fed after the corrected region information has been stored does not correspond to the stored region information, and determining that multi-feed has not occurred if the region information detected for the medium fed after the corrected region information has been stored corresponds to the stored region information.