Patent ID: 7931145

Claim:
A cassette comprising a top plate, a base plate, a plurality of posts arranged between the top plate and the base plate and defining an operation space, a securing device comprising a stop mechanism and a clamping mechanism and arranged along with one post, wherein the stop mechanism comprises: a stop projection provided on an outer side of the one of posts; a stop bar parallel to the one post and slidably disposed through the stop projection; and a stop block disposed on a side of the stop bar, wherein a lower end of the stop bar extends beyond a plane of the base plate when the stop block is bearing against an upper surface of the stop projection, and the clamping mechanism comprises: a first connection part with a rotation shaft in a middle portion of the first connection part being fixed to the one post and with one end connected with the stop bar in a transmission way; and a securing portion, which connects with the other end of the first connection part and is driven by the first connection part to move horizontally with respect to the one post when an up-and-down movement of the stop bar leads to rotation of the first connection part, wherein the one end of the first connection part connects with the stop bar via a second connection part, the second connection part connects with the stop bar and the first connection part with a first and a second hinges, respectively, the securing portion connects with the other end of the first connection part with a third hinge; and the rotation shaft and shafts of the first, second and third hinges are parallel with each other.