In a ring spinning frame provided with two parallel alignments of bobbin hangers 8, a plurality of roving guides 30 is arranged in an alignment at an intermediate position between the two alignments of bobbin hangers 8, wherein a first group of roving guides 30 is formed by roving guides 30 alternately positioned in the roving guide arrangement and a second group of roving guides 30 is formed by the remained roving guides 30 thereof, an improved creel mechanism 40 for relatively displacing the first group of roving guides 30 and the second group of roving guides 30 whereby a first intervening space between two adjacent roving guides 30 and a second intervening space between two adjacent roving guides 30 are alternately formed along the alignment of the roving guides 30, wherein the first intervening space ensures a free passage of a full packaged roving bobbin FB but the second intervening space does not permit a free passage of the full packaged roving bobbin FB, the above-mentioned formation of two intervening spaces being created alternately, at each intervening space between two adjacent roving guides 30, by the reciprocal motion of the displacing mechanism 40.