Method of compensating sheet feeding errors in ink-jet printer

A method of compensating a sheet feeding error in an ink-jet printer, the printer comprising a rotation measuring unit of a sheet feeding roller, a unit to measure a reciprocating movement of an ink cartridge mounted on a carriage, and a sensor to measure an image printed on a sheet of material, the method comprising:

• printing a test pattern on the sheet;
• scanning the printed test pattern using the image sensor and measuring a distance W1 between a starting point X1s and an ending point X1e of the test pattern;
• driving the feeding roller and moving the sheet to a set distance Hm so that the set distance Hm is shorter than a length of the test pattern in a sheet feeding direction;
• scanning the test pattern using the image sensor and measuring a distance W2 between a starting point X2s and an ending point X2e of the test pattern;
• calculating a feeding distance H, along which the sheet is actually fed, from a difference between the distances W2 and W1;
• calculating a sheet feeding error E of the sheet from a difference between the feeding distance H and the set distance Hm;
• and
• compensating for the sheet feeding error E at the set distance Hm.