How to solve the problem that the computer pattern machine does not cut the thread?

- Sep 17, 2020-

The general problems of the computer pattern machine may be caused by the insufficient separation of the online line, causing the movable knife to not hook the line, the line is not smoothly passed, and the thread cutting time is not correct. The details are summarized as follows:

computer pattern machine does not cut the thread.jpg

1.The thread trimming time is wrong. When the matching time is early, the suture will come out of the needle, which may cause poor thread trimming; when the matching time is late, the needle will collide with the thread reel, resulting in poor thread trimming.

2.The knife line is not divided.

3.The knife is worn.

4.It's not good to go online.

5.The matching time of the needle and the hook of the computer pattern machine is wrong. It may be that the gap of the positioning piece of the rotary hook is wrong, the gap between the needle and the tip of the rotary hook is wrong, the gap between the rotary hook and the needle plate is wrong, the ascent and height of the needle bar are wrong.

6.The position of the fixed knife and the crimping piece is wrong. If the initial position of the crimping piece is incorrect, it will cause poor thread take-up; if the initial position of the fixed knife is incorrect, it will cause poor thread trimming.

7.The action range of the off-line spring is too small.

8.The position of the knife is not accurate, and when the distance between the knife and the fixed knife is too large, bad cutting will occur.

Solution:

1.Adjust the cut time.

2.Adjust the position of the shear wire electromagn and adjust it in conjunction with the shear cam.

3.Push open the hook cover of the faulty side, turn the hand wheel of the computer pattern machine by hand, observe whether the upper thread slides from the surface of the hook cover until it is retracted smoothly (focus on whether the hook action can ensure that the upper thread runs from the surface of the hook cover and the shuttle block and the needle plate Pass through the gap smoothly), otherwise adjust the position of the hook to ensure that the upper thread can pass between the surface of the shuttle cover and the hook, and between the shuttle block and the needle plate. Check the surface of the hook for scratches, rust and other defects.

4.Adjust the gap between the positioning piece of the rotary hook to 0.2 mm, the gap between the needle and the tip of the rotary hook to 0.05 mm, the gap between the rotary hook and the needle plate to 0.9 mm, the height and height of the needle bar should be appropriate.

5.Replace the movable knife.

Note: Under the condition that the needle guard of the double-needle car is working, if the matching clearance between the needle and the tip of the hook is proper, there is a possibility that the needle will fit properly when it is bent. In this way, the position of the moving knife will deteriorate, thread trimming errors will occur after the upper thread comes out.

6.Correctly check and adjust the position of the fixed knife and the press.

7.Check and adjust the strip spring stop plate correctly.

8.Check and adjust the front and rear positions of the moving knife correctly.


If you want to know us, please contact: wym@eagleco.cn



Previous:What are the components of the KF94 face mask machine? Next:What is KF94 face mask machine?