JP2009039952A5 - - Google Patents

Claims (6)

In a printing apparatus that detects a set state of a print medium by a plurality of print medium detection sensors ,
A first detection number at which the print medium detection sensor detects the presence of a print medium at a predetermined timing ;
A printing apparatus, comprising: a skew determination unit configured to determine a skew of the print medium based on a second detection number detected by the print medium detection sensor after the predetermined time has elapsed from the predetermined timing . The skew determining means, said second detection number is equal to or less than the first number of detected by one or more, when the first detection number is equal to or larger than the predetermined number is of the print medium The printing apparatus according to claim 1, wherein it is determined that there is no skew. The skew determining means, said second detection number is a single case, when the first detection number was 2 or more was possible to determine that there is no skew of the print medium The printing apparatus according to claim 1.   The detection result of the presence of the print medium detected by the print medium detection sensor is stored, and the print medium is extracted based on whether or not the same detection result exists before and after the position where the detection result is maximum. The printing apparatus according to claim 1, further comprising: a sampling determination unit that determines the above. Based on the logical sum of the first detection result of detecting the change of the print medium detection sensor at the predetermined timing and the second detection result of the print medium detection sensor after a predetermined time has elapsed from the predetermined timing , the reference position of the head centering 5. The printing apparatus according to claim 1, further comprising a first head centering reference position correcting unit that corrects the image. When the second detection number is one and the print medium detection sensor is a print medium detection sensor located on one side of the center of the print medium settable range, the print medium detection sensor A second head centering reference position correction unit is provided that corrects the position of the print medium detection sensor positioned in the opposite direction from the position of the position to the reference position of the head centering by an amount approximately equal to the print medium width. The printing apparatus according to claim 1.