Secondly, maintenance of sewing machines should also pay attention to the following points: 1. After the completion, the needle is inserted into a pinhole Board, lift the presser foot, and cover head with a hood to prevent dust intrusion. 2. Start working, first check the critical part, stepped up heavy circumstances, there is no special voice, needles is normal and so on, if irregularities are found, should be timely maintenance. 3. Machines used for a long time, to conduct an overhaul, such as wearing large parts, to replace them.