An object of the invention is to be provide a yarn feeding apparatus of a flat knitting machine capable of accurately predicting a required amount of a knitting yarn and knitting a fabric while supplying knitting yarn necessary for knitting. The display panel is connected to the connection terminal. The plural nodes are connected to two or more branch lines of the branch lines to communicate frames of data among the branches with each other. Applying the present invention, the mobility security on the transport layer in the next generation network is ensured. The first and second clock gaters comprise a programmable delay circuit. A direction of flux of the permanent magnets is perpendicular to a direction of an array of the stator, and the tip portions of the stator core sandwich the rotor and are disposed to be nearer to the rotor than the stator coil.