Image reading apparatus having an auto document feeder

An image forming apparatus comprising:

• an image reading unit for reading the image of an original placed in an original reading area to generate image data;
• an original conveying unit for conveying an original to said original reading area of said image reading unit in a sub-scan direction;
• an original position detecting unit for detecting the position of an original conveyed to said original reading area by said original conveying unit;
• an operation unit for calculating a dislocation amount of an original in said sub-scan direction between said detected original position and a standard original reading position in said original reading area;
• and
• a control unit for controlling an original conveying distance of said original conveying unit so that said dislocation amount in said sub-scan direction can be eliminated.

An image forming apparatus comprising:

• an image reading unit reading the image of an original placed in an original reading area by a photoelectric conversion element to generate image data;
• an original conveying unit for conveying an original to said original reading area of said image reading unit in a sub-scan direction;
• an original position detecting unit for detecting the position of an original conveyed to said reading area by said original conveying unit;
• an operation unit for calculating a dislocation amount between said detected original position and a standard original reading position in said original reading area;
• a dislocation display unit for displaying said dislocation amount;
• a printer for forming an image on a sheet in accordance with said image data, and
• an adjustment device for changing the position of said original in response to said dislocation amount.

An image forming apparatus comprising:

• an image reading unit for reading the image of an original placed in an original reading area by a photoelectric conversion element to generate image data;
• an original conveying unit for conveying an original to said original reading area of said image reading unit in a sub-scan direction;
• an original position detecting unit for detecting the position of an original conveyed to said original reading area by said original conveying unit;
• an operation unit for calculating a dislocation amount of an original in said sub-scan direction from said detected original position and a standard original reading position in said original reading area;
• a control unit for controlling an original conveying distance of said original conveying unit in accordance with said dislocation amount, so that dislocations in said sub-scan direction can be avoided;
• and
• a printer for forming an image on a sheet in accordance with said image data.