| 摘要 |
The mechanism comprising: a ring body; a plurality of extending/retracting means which are separately provided at the ring body at equal intervals in the circumferential direction of the ring body; an arc-shaped retaining body which is provided at each of the plurality of the extending/retracting means and which can retain a bead with a filler; and driving means which applies driving force to the extending/retracting means and synchronously operates the extending/retracting means so as to move and extend/retract the retaining body in the radial direction of the ring body, the extending/retracting means further including: a pair of swing links which are separately disposed in the radial direction of the ring body, and the base end portions of the swing links being rotatably connected to the ring body; and a connecting link which is rotatably connected to each of the distal end portions of the pair of swing links, and the retaining body being provided at the inner end portion of the connecting link wherein, when the extending/retracting means is driven by the driving means and the extending line of the connecting link practically intersects the central axis of the ring body, all of the plurality of the retaining bodies are positioned on the same circle which centers around the central axis of the ring body.
|
