A yarn carrier 1 is capable of being engaged with a pin 4 protruding from a carriage 3 at two engagement points 8, 9 separated by a delay amount ΔL with respect to a center 1a, respectively. Assuming that the carriage 3 approaches from the right with the pin 4 protruding in order to select and haul the yarn carrier 1 stationary on a yarn guide rail 2, the tip of the pin 4 is guided on a guide portion 11b of an oscillating piece 11, and a tip portion 11c prevents engagement with the engagement point 9 by making oscillation displacement about a shaft 11a. The pin 4 is guided to the engagement point 8 by guide portions 13a, 12a of oscillating plates 13, 12, and abuts on a tip portion 10c of an oscillating piece 10, which is engaged with the front side of the pin 4. The oscillating plate 12 also departs from the pin 4, and a tip portion 12c ascends to be engaged with the rear side of the pin 4.