Abstract: A detection device includes a frame, a transport mechanism, detection mechanisms, and a grasping mechanism. The transport mechanism includes a feeding line, a first flow line, and a second flow line arranged in parallel on the frame. The detection mechanisms are arranged on the frame and located on two sides of the transport mechanism. The grasping mechanism is arranged on the frame and used to transport workpieces on the feeding line to the detection mechanisms, transport qualified workpieces to the first flow line, and transport unqualified workpieces to the second flow line.

Abstract: A rotary cutting module for a paper cutting device has a roller and a paper-cutting blade. The roller extends along a rotating axis. A blade mount and multiple dynamic balancing recess sets are formed on an outer circumferential surface of the roller. The dynamic balancing recess sets are disposed apart from each other along the rotating axis. Each one of the dynamic balancing recess sets has multiple balancing recesses annularly disposed apart from each other. A depth of one of the balancing recesses of one of the dynamic balancing recess sets is different from a depth of one of the balancing recesses of another one of the dynamic balancing recess sets. Center of mass of each axial segment of the rotary cutting module can be adjusted individually to mitigate couple unbalance, thereby mitigating dynamic unbalance.