or its feeding stops the lamp indicates such disconnection or stoppage a terminal jack 43 is provided electrically connecting push button switch 33 yarn running sensor 39 yarn stopping sensor 40 and motor 23 to a central control unit provided in the main body of the knitting machine in the above embodiment the upper and lower conical surfaces 22a and 22b of the storage drum 22 are shown as formed on the storage drum itself but they also may be formed by bending the upper and lower end portions of the pins 21 so as to have an appropriate slant angle it is also possible to eliminate the pins 21 by integrally forming a concave and convex portion on the surface of the storage drum 22 of the same shape as the pins 21 respectively the motor 23 for rotating cap 27 is a dc motor capable of normal and reverse rotation and preferably is one that can be driven selectively by electric power of 6v 9v 12v or 24v according to the kind of yarn to be fed the stops 24a and 29a formed on the fixed washer 29 of the movable threaded tube 26 and the top end portion of the hollow threaded tube 24 respectively are desirable to be formed so that the fourth yarn inducing hole 31 of the rotary cap 27 is located at a closest position to the fifth yarn inducing hole 41 on the holder 10 when the rotary cap 27 is located at the lower position that is when the stops 24a and 29a contact each other the operational condition and effect of the yarn feeding apparatus according to a preferred embodiment of the present invention having the construction as above will be.