Abstract: In order to prevent the long side panel folder in YB917 carton overwrapper from squeezing cigarette cartons and causing carton jam in the folding channel, a clamp-type long panel side folder was designed, which mainly consisted of a fixed base, a movable plate, a trigger device and an inductance approach switch. When cigarette cartons block the folding channel during the folding process, the movable plate moves away from the fixed base timely so that the connecting rod in the trigger device approaches to the switch under the action of a spring blade, thereby triggering an alarm signal and immediately stopping the machine. The designed folder was tested on cigarette brand "Taishan (Red General)" in Jinan Cigarette Factory, and the results showed that the long side panel folder was no longer damaged after the application of the designed folder, the number of deformative cartons reduced by 91%, and the average time needed to remove deformative cartons reduced from 5.7 min to 0.4 min. This technology supports the reduction of spare parts loss and promotes the maintenance efficiency of cigarette packing equipment.