摘要：

An embodiment of the invention provides 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. 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 slidable disposed through the stop projection, and a stop block disposed on a side of the stop bar. 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. 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.

展开