Straight buttonhole machine repairs

In addition to the most basic mechanism in ordinary sewing equipment, it also adds a swing needle and displacement mechanism, a cutter mechanism, a thread trimmer mechanism, and a brake speed change control mechanism. At present, the basic structure of the most common buttonhole machines in China can be roughly divided into two categories. The models characterized by Juki 761 and 781 have the main control panel (curve wheel) placed horizontally at the lower part of the machine base; For models characterized by Brother 814 and 816, the main control panel is placed vertically in the middle of the machine base, and the order of sewing locks is different from left to right and from right to left. Understanding and mastering the most basic debugging and positioning points of the buttonhole machine, making accurate analysis when the equipment fails, debugging and positioning, and improving work efficiency are undoubtedly the prerequisites for the maintenance of this type of equipment.

During the sewing process, the needle bar of the straight buttonhole machine not only moves up and down but also moves horizontally. Under the action of the swing needle and the displacement mechanism, the straight needle can be positioned at different positions Stab into the material for a left row, right row, front, and back tacking to create a complete buttonhole.

The importance of the height of the needle bar, the time of swinging the needle, and the positioning of the needle position in the positioning process of the piercing mechanism.

1.1 Needle bar height positioning

Needle bar height positioning is very important in sewing equipment debugging, and much debugging work is based on it. Whether the height is reasonable is directly related to the sewing effect and the failure rate. The general method is: install the needle according to the requirements, take the right needle position in the left row or the left needle position in the right row, turn the machine by hand to lower the needle bar to the lowest position, and measure the distance between the lower end of the needle bar and the plane of the needle plate ( Juki 781 is about 11.9mm, Brother 814 is about 13.5mm). This parameter will be different for different models, or for products with too much difference in sewing fabrics of the same model, the positioning will be different. In the actual debugging work, in order to meet the sewing needs of the types of sewing materials and special products, it is the same type of equipment. The needle bar should be raised, and the sewing effect will be improved with the cooperation of the thread hooking mechanism. The height of the needle bar should be controlled within ±1mm from the standard value.

If you need to buy a Straight buttonhole machine, you can contact Topeagle.

wym@eagleco.cn