1 First of all, understand the customer's cognition of the machine, what level it belongs to, the needle, thread, material used, sewing process, confirm the height of the presser foot, whether there is a mold, etc.
1.1 Whether the wire frame is installed correctly or not, and the position of the wire drum and the drum pad
1.2 Threading path
1.3 Needle installation
1.4 Is the needle in the middle, presser foot and needle plate
1.5 Whether the needle plate has burred
1.6 Check the positioning hook
2. Break Thread During Operation
2.1 The big clamp is loose and tight, and the take-up spring is elastic
2.2 Does the presser foot touch the formwork? Is it because of the formwork problem
2.3 Check the die and material when the wire is broken at a certain point.
2.4 Also check the path through the thread
2.5 The tip and inner circle of the rotary hook, check the positioning of the rotary hook.
2.6 The position of shuttle bed is not accurate, and there is a lot of garbage.
2.7 Needle bar positioning, usually machine medium height, moderate thickness of material.
2.8 Pigeon circle thread path, needle screw edge sharp or not.
2.9 Whether there is accumulated wool garbage in the large and small wire clamps.
2.10 Cotton thread and nylon thread have different requirements for take-up spring. Cotton thread is weak and nylon thread is strong.
3. Thread Trimmer Thread-loosen
3.1 Whether the standard position of movable knife and fixed knife is changed, needle and fixed knife 3.0, movable knife holder to cutter shaft 3.0
3.2 The position of dividing piece and fixed knife. When the needle descends, pull the movable knife to make the blade align with the groove to see whether the position of the dividing piece covers the position of the general needle. Generally speaking, it can cover two-thirds of the position. The fixed knife thread guard piece and the shuttle bed have a position of one to two millimeters. At the same time, when the movable knife cuts the thread, it can cover the fixed knife thread guard piece.
3.3 The take-up spring is loose and tight, and the cotton is small.
3.4 Spindle positioning, take-up bar position, needle bar height.
