First, thread the thread correctly. Incorrect threading will cause problems such as skipped stitches, thread breakage, and mismatched stitches. Under the premise of beautiful stitches, the needle thread and looper thread should keep the lowest tension, and the needle should use uo113gs 14#～16#.
(1) Adjustment of looper and needle
Straight needle and curved needle should be fully inserted into the bottom of the looper seat at the top of the straight needle needle holder when installing, and the gap between the tip of the looper and the side of the needle should be kept at 0～0.1mm. The distance should be maintained at 2.5 ~ 3 mm. The needle rises from the bottom dead center, and the looper starts to hook the thread. When the tip of the looper coincides with the center line of the needle, the tip of the looper should be 1.5 to 2 mm above the needle hole.
(2) Adjustment of the wire lever
The thread lever should be kept flat upward, and when the head of the thread lever moves to the center of the needle, the distance between the thread lever and the needle should be 0.5 mm. When the looper hooks the needle thread and the thread lever starts to draw the thread, carefully adjust the thread lever so that it can smoothly enter the loop of the looper to hook and remove the looper thread. At the same time, ensure that the thread lever is in contact with the looper. The gap between the tip of the needle is in the range of 0.1 to 0.2 mm, and it is advisable to just not touch the curved needle during actual adjustment.
(3) Adjusting the amount of needle thread
When the needle descends to the bottom dead center, make the eye of the needle bar thread passing hook flush with the thread amount adjusting rod. If you want to have a larger needle and thread loop, there will be endless product varieties such as lockstitch sewing machines, overlock sewing machines, and interlock sewing machines; special machines such as buttonholes, button sewing, bartacking, pattern machines, suit opening bags and other special machines have accelerated their development efforts; The thread amount adjustment rod should be moved up, otherwise, the thread amount adjustment rod should be moved down.
(4) Adjustment of looper thread
When using chemical fiber thread, the position of the looper thread hook can be adjusted up and down. There are many series of related products. The customer may have purchased a piece of equipment, but it cannot be matched with other equipment purchased later according to the special process requirements; After purchasing a complete set of equipment, the distance between the looper spool and the hook of the thread when the looper is at the bottom is 7-8 mm.
The above-mentioned adjustment methods for skipping stitches are only for readers' reference, and one or more methods should be adopted in the maintenance according to the actual situation.
