1. Suddenly stop during sewing, and the handwheel becomes stagnant.
Possible reasons: The sewing machine has been working at a low speed for a long time; overheating of the machine may cause the power of the motor to automatically shut down (sewing machine of poor quality).
Solution: Turn off the power and wait for 20 minutes, the safety device will restart, and the sewing machine is ready to start working.
2. No needle movement
Reason: The presser foot is not lowered; the bobbin is not in the correct position.
Solution: Replace the empty spool and re-identify the needle; lower the presser foot; press the bobbin spool to the end and return to the left; lower the buttonhole lever.
3. The sewing machine is trying to stop
Cause: The presser foot does not match or the needle hits the presser foot; the needle falls off and jams into the crochet hook.
Solution: Replace the presser foot; take out the needle and install a new needle.
4. The upper thread is broken
Reasons: improper threading method; knotted thread; excessive thread tension; bent, blunt needle or blisters (a common problem with cheap needles); incorrect needle size; improper needle placement; improper needle and thread coordination; initial sewing speed Too fast; threading without thread take-up.
Solution: re-start the thread normally; eliminate the knotting of the thread; adjust the pressure of the thread clamp; replace the needle; replace the needle of the appropriate size; properly place the needle; (for more exciting information, pay attention to the sewing equipment house) change the thread or Change the needle; start the sewing machine at medium speed; check the threading procedure.
5. The bottom thread is broken
Cause: The bobbin is not completely inserted into the bobbin case; the bobbin is entangled with thread; the bobbin does not run smoothly in the bobbin case; there is yarn in the bobbin case or on the bobbin.
Solution: Carefully reload the bobbin case into the bobbin case; arrange the bobbin case outgoing line; check that the bobbin core may be damaged; clean the bobbin case and the bobbin core.
6. Jumper
Cause: The thread tension is too large; the needle is bent or blunt; the needle size is incorrect; the needle and thread are not properly matched; the thread has not passed through the thread take-up lever; the pressure of the presser foot is not enough; the needle is improperly placed.
Solution: adjust the thread tension; replace the needle; select the appropriate size needle; replace the needle or thread; check the threading step; increase the pressure of the presser foot; re-load the needle.
7. The stitches do not meet the requirements
Reason: The machine thread is not completely pulled into the sensor; the threading method is wrong; the bobbin case is out of the wrong thread; the size of the spool cap does not match.
Solution: fully pull the machine thread into the sensor; thread the thread correctly; correct the bobbin case outlet; use a spool cap of the same size.
8, the stitches are chaotic
Cause: The needle size is not correct; the threading step is wrong; the thread tension plate is loose; it is caused by the strong pulling of the fabric; the presser foot is not strong enough or completely loosened; the bobbin is deformed.
Solution: Choose a needle suitable for thread and fabric; re-thread the machine; tighten the thread clamp; do not pull the fabric forcefully but feed the material gently; tighten or reinstall the presser foot; rewind the bobbin.
9, the fabric is wrinkled
Reasons: The stitches are too large for a specific fabric; the needle tip is dull; the thread tension is not appropriate; the presser foot is not strong enough; the fabric is too thin; the thread diameter or material difference of the upper thread and the bottom thread used is caused.
Solution: reduce the stitch size; replace the needle; adjust the thread tension; increase the pressure of the presser foot; use a thin material backing paper; the upper thread and the bottom thread use the same quality and the same thread diameter.
10. Stranded wire
Reason: The upper thread and the bottom thread have not passed the presser foot; the feeding teeth sink
Solution: press the bottom thread of the upper thread on the presser foot at the same time; raise the feed dog
11. Broken needle
Reasons: thin needles are used to sew thick materials; the needle is not installed adequately; the needle tightening gong is loose; the presser foot is not selected properly; the presser foot is loose.
Solution: Replace the appropriate needle; reinstall the needle; tighten the needle to fix the gong wire; select a suitable presser foot; reinstall the presser foot.
12. Excessive noise, a rattling sound, machine crushing to death
Reason: debris stuffing the feeding teeth; yarn at the tip of the shuttle; thread entangled with the shuttle.
Solution: Clean the machine; disassemble the machine and clean the shuttle.
13, the machine does not feed
Reasons: set the stitch length to 0; the presser foot is too loose; the position of the feeding teeth is too low; the fabric is knotted under the thread.
Solution: reset the appropriate stitch pattern and length; adjust the presser foot pressure to "normal"; raise the feed dog; put the double thread under the presser foot before sewing.
14. Unable to thread the needle; the threader does not move; the threading hook cannot enter the eye of the needle
Reason: The needle is not in the highest position; the self-protection of the needle recognition device when the needle is not in place; the needle is not fully installed in place.
Solution: Turn the handwheel until the needle reaches the highest position; insert the needle completely.
15. The threader does not return to its position and the sewing machine stops; the threading hook retains the eye of the needle
Cause: The sewing machine moves unexpectedly when the threading hook is still in the eye of the needle.
Solution: slightly move the handwheel clockwise and take out the thread hook.