Document feeder with adjustable length document reversing transport path

A document feeder for feeding documents to a document scanning section where an image of each document is scanned, comprising:

• first fed means for feeding the document to the document scanning section;
• a first transport roller for transporting the document from the scanning section to a transport path;
• reversing means for turning over the document transported by said first transport roller;
• a second transport roller for feeding to the document scanning section the document that has been turned over by said reversing means;
• and
• length adjusting means for adjusting a length of an actual document transport course of said transport path depending on the size of the document, said length adjusting means comprising
• reversing guide means forming an outer wall of said transport path,
• a motor for driving said reversing guide means forward or backward depending on the size of the document to adjust the length of the actual document transport course of said transport path, and
• sensor means for detecting that a leading edge of the document has reached said second transport roller to thereafter stop rotation of said second transport roller and direct said reversing guide means forward.

A document feeder for feeding documents to a document scanning section where an image of each document is scanned, comprising:

• first fed means for feeding the document to the document scanning section;
• transport means for transporting the document from the scanning section to a transport path;
• reversing means for turning over the document transported by said transport means;
• second feed means for feeding to the document scanning section the document that has been turned over by said reversing mean;
• and
• length adjusting means for adjusting a length of an actual document transport course of said transport path depending on the size of the document, said length adjusting means comprising
• reversing guide means forming an outer wall of said transport path,
• a guide shaft to which said reversing guide means is slidably coupled,
• a wire secured to said reversing guide means, and
• pulleys, around which said wire is engaged, for moving said reversing guide means along said guide shaft by driving said wire.

A document feeder for feeding documents to a document scanning section where an image of each document is scanned, comprising:

• first fed means for feeding the document to the document scanning section;
• a first transport roller for transporting the document from the scanning section to a transport path;
• reversing means for turning over the document transported by said first transport roller;
• a second transport roller for feeding to the document scanning section the document that has been turned over by said reversing means;
• and
• length adjusting means for adjusting a length of an actual document transport course of said transport path depending on the size of the document, said length adjusting means comprising
• reversing guide means forming an outer wall of said transport path,
• a motor for driving said reversing guide means forward or backward depending on the size of the document to adjust the length of the actual document transport course of said transport path, and
• sensor means for detecting that a leading edge of the document has not reached said first transport roller when a leading edge of the document has reached said second transport roller to thereafter stop rotation of said second transport roller and direct said motor to drive said reversing guide means forward at a speed faster than half a speed at which said first transport roller transports the document to said transport path.