QP-1 chopping device is special equipment that is used for cutting piping trim in the field of garments. It is mainly used in series of BK/DC band knife cutting machine to cut the knitted fabric of wound roll (internal non-paper-core or using special core to coil with) transversely. Thus, it forms piping trim. QP-1 chopping device can be installed in series of BK/DC band knife cutting machine through guiding, simply and conveniently, and does not need to change the measure. This device has a locator, which can cut piping trim width that you need. And it is accurate to millimeter.