To improve operability and controllability of a pinching device.SOLUTION: The sandwich structure includes a plurality of pinching pieces (10) which are opened and closed by turning about a turning fulcrum part (21) as a fulcrum, and a plurality of pinching pieces (10) (30) which advances and retracts the linear motion member (31) in the cylindrical member (20), and is moved forward and backward by the advancing and retreating mechanism (30) A clamping device in which a linear motion member (31) is engaged with a clamp piece (10) so as to rotate a clamp piece (10), characterized in that the advancing and retreating mechanism (30) (30) are arranged linearly on the rear side of each clamping piece (10), and these plural advancing and retreating mechanisms (30) are independently controlled, respectively I made it. (FIG.【課題】 挟み装置の動作性及び制御性を向上する。【解決手段】回動支点部(21)を支点にし回動することで開閉する複数の挟み片(10)と、前記挟み片(10)の前端側を前方へ突出させるようにして回動支点部(21)を支持した筒状部材(20)と、該筒状部材(20)内で直動部材(31)を進退させる進退機構(30)とを備え、進退機構(30)により進退する直動部材(31)を挟み片(10)に係合させて、挟み片(10)を回動するようにした挟み装置であって、進退機構(30)を、複数の挟み片(10)にそれぞれ対応するように複数具備するとともに、各進退機構(30)を、各挟み片(10)の後方側に直線的に配置し、これら複数の進退機構(30)をそれぞれ独立して制御するようにした。【選択図】 図4
