The wire protection plate is not installed correctly. According to the fault description of the old-fashioned edge-coding machine, the reason why the old-fashioned edge-coding machine does not rotate is that the thread guard plate is not installed correctly. The position of the thread guard plate needs to be adjusted so that the thread guard plate is close to the machine needle. The code edge machine is a device used to identify barcodes and QR codes, and is widely used in business, logistics, and medical fields.