Prevent overlap device

The utility model discloses a prevent overlap device, comprises a box bod, the box body is right trapezoid on longitudinal section, its inclined plane is located the box body top, box body front sideopening, the rear side and the left and right sides seal, and the edge -trimming cutter is located the box body front side, the box body front side is higher than the rear side, just to being providedwith the breach on the left side of aluminium strip or the right side on the box body, the box body rear side that corresponds is close to the aluminium strip end and is provided with the breach, thebreach of box body rear side is connected with the breach on box body left side or right side, the device is through setting up the box body at the edge -trimming cutter rear side, set up the breachon box body left side or right side and rear side, and the aluminium strip limit portion that makes the transportation shifts out through the breach on left side or the right side breach from the boxbody rear side from the box b