Image scanner with image scanning device positioning

An image scanner comprising:

• a scanner body on which a document to be scanned is placed;
• an image scanning device provided in the scanner body;
• a carriage configured to hold the image scanning device, wherein the image scanning device is held by the carriage so that the image scanning device is movable relative to the carriage;
• a guide unit which is provided on the scanner body and is configured to guide the carriage so that the carriage moves in a moving direction perpendicular to a main scanning direction of the image scanning device;
• a document feeder configured to feed documents to be scanned;
• a hinge configured to support the document feeder in a manner such that the document feeder can be in an opened state and in a closed state relative to the scanner body,
• wherein a document placed on the scanner body is read by the image scanning device while the carriage is moving in the moving direction, and a document conveyed by the document feeder is read by the image scanning device in a state in which the carriage positions at a scanning position,
• the image scanner further comprising,
• a contacting portion, provided on the carriage, that positions the image scanning device relative to the carriage by contacting the image scanning device for reading the document placed on the scanner body;
• a stopper configured to position the image scanning device;
• and
• a positioning member which is provided on the document feeder and is configured to position the stopper relative to the document feeder in the closed state,
• wherein the stopper is configured such that, after the stopper is positioned by the positioning member by bringing the document feeder into the closed state, the stopper is fixed at a position on the scanner body that positions the image scanning device relative to the document feeder such that the main scanning direction of the image scanning device is perpendicular to a feeding direction in which the document feeder feeds the documents, and before the stopper is positioned by the positioning member, the stopper is not fixed at the position on the scanner body, and
• wherein the carriage moves to the scanning position, at which the image scanning device scans the image of the document fed by the document feeder, such that the image scanning device is pressed against the stopper fixed on the scanner body and the image scanning device pressed against the stopper moves relative to the carriage so that the image scanning device comes out of contact with the contacting portion of the carriage, and the image scanning device is positioned by the stopper,
• wherein the stopper is configured to contact at two points on the image scanning device.