To eliminate the necessity of replacement of an existing bearing and make a device adaptable onto the bearing.

This type of a device is equipped with a fly wheel 5: capable of tiltedly moving so as to cover a seat surface, thereon the tip of a winding bar is placed, on the tip of a rotatively movable spindle, and moreover a jack 4: interlocked with the upper surface of a bearing main body 10 so as to be pivotally rotated around a vertical spindle 20 vertical to a rotation spindle. The rod 40 of the jack 4 is equipped with a ball joint 41 on the tip, and thereon a roller 42 is fitted, which is retained there, and is housed in an annular groove 55 in the inside of the rear surface 51 of the tiltedly movable fly wheel 5 of the bearing.