Circular knitting machine for prompting knitting machine status instantaneously based on cloth surface status of fabric

A circular knitting machine for prompting a knitting machine status instantaneously based on a cloth surface status of a fabric, the circular knitting machine comprising a cam supporting base and a needle cylinder driven to rotate relative to the cam supporting base, and the circular knitting machine being started to knit the fabric which is doffed a side of the needle cylinder opposite to the cam supporting base, the circular knitting machine comprising:

• a camera module, photographing the fabric during doffing and generating a plurality of image data, wherein a camera lens of the camera module is not rotated with the needle cylinder, and is controlled by a plurality of photographing signals to photograph the fabric during doffing;
• an information processing unit, receiving the plurality of image data and comparing each image data with another image data which is located on a same vertical line of the fabric and photographed in at least one previous revolution of the needle cylinder, wherein a knitting machine status is prompted when a difference occurs;
• and
• an encoder, generating a plurality of pulse signals when the needle cylinder is rotating, and the encoder outputting the plurality of pulse signals to one of the camera module and the information processing unit to count the plurality of pulse signals and to generate the plurality of photographing signals, wherein a count value used by the one of the camera module and the information processing unit is a factor of a total amount of the plurality of pulse signals during the needle cylinder rotating one revolution.