Image reader and document conveying method

An image reader comprising:

• a reading specifying device arranged to specify either of double-sided reading and single-sided reading as a document reading method;
• a document feeding device arranged to feed a document from a paper feed tray;
• a route switching device arranged to, at a branch point between a first conveyance path for the double-sided reading and a second conveyance path for the single-sided reading, on a basis of the specified reading method, switch a document conveyance route;
• and
• a cancel input device arranged to input a cancel instruction for the double-sided reading;
• wherein
• the route switching device selects the second conveyance path on a basis of the cancel instruction;
• the first conveyance path is longer than the second conveyance path;
• one or more documents that are left on the paper feed tray when the cancel instruction is inputted are fed after the input of the cancel instruction, and discharged through the second conveyance path;
• and
• if two or more documents are left on the paper feed tray when the cancel instruction is inputted, the document feeding device feeds the two or more documents at document intervals that are narrower than a document interval for the double-sided reading before the input of the cancel instruction.

A document conveying method comprising:

• a reading specifying step of specifying either of double-sided reading and single-sided reading as a document reading method;
• a document feeding step of feeding a document from a paper feed tray;
• a cancel input step of inputting a cancel instruction for the double-sided reading;
• and
• a route switching step of, at a branch point between a first conveyance path for the double-sided reading and a second conveyance path for the single-sided reading, the second conveyance path being shorter than the first conveyance path, on a basis of the specified reading method, switching a document conveyance route, and on a basis of the cancel instruction, selecting the second conveyance path;
• wherein
• one or more documents that are left on the paper feed tray when the cancel instruction is inputted are fed after the input of the cancel instruction, and discharged through the second conveyance path;
• and
• if two or more documents are left on the paper feed tray when the cancel instruction is inputted, in the document feeding step, the two or documents are fed at document intervals that are narrower than a document interval for the double-sided reading before the input of the cancel instruction.