Electronic Controlled Pattern Sewing Machine (PLK-G Series)
Troubleshooting — Head Section of Sewing Machine —
Please click each question item.
Needle thread brakes.
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①Isn't the needle thread tension too strong?
Adjust the needle thread tension.
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②Is the strength of thread take-up spring adequate?
Adjust the needle thread take-up spring.
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③Are there scratches on the thread contacting part of the needle plate, hook, and presser foot?
Replace if any scratches are found.
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④Is thermal cut the cause?
Slow down the sewing speed.
Bobbin thread brakes.
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①Isn't the bobbin thread tension too strong?
Adjust the bobbin thread tension.
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②Are there scratches on the thread contacting part of the needle plate and bobbin case?
Replace with a new part if there are any scratches.
The thread comes off from the needle at the beginning of sewing.
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①Isn't the thread tale length after trimming too short?
Adjust with the pre-tension.
Click here for adjusting the needle thread remaining length after the thread is cut.
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②Isn't the thread take-up spring motion too large?
Adjust the thread take-up spring motion.
Too many stitch skipping.
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①Is the gap between the needle and hook (middle) too large?
Adjust the gap (position) between the needle and hook (middle).
Half-rotation: Click here for gap adjustment of the needle and hook (middle).
Total rotation: Click here for position adjustment of the needle and hook.
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②Is the timing right on the needle and hook head?
Adjust the timing by position adjustment of the needle (middle) and hook.
Half-rotation: Click here for position adjustment of the needle and hook (middle).
Total rotation: Click here for position adjustment of the needle and hook.
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③Is the hook driver pushing the needle too much?
Adjust the gap between the needle and hook driver.
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④Is the needle attached correctly?
Check the needle is attached correctly.
Thread does not get cut.
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①Is the fixed knife dull?
Sharpen or replace the fixed knife.
Half-rotation: Click here for position adjustment of fixed knife.
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②Check the position of thread cutting cam.
Half-rotation: Click here for position adjustment of thread cutting cam.
Total rotation: Click here for the attaching position adjustment of thread cutting cam.
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③Are the position and holding position of the moving knife correct?
Adjust the moving knife.
Half-rotation: Click here for position adjustment of moving knife.
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④Does stitch skipping occur at thread cutting?
Refer to “Too many stitch skipping”.
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⑤Are the thread cutting solenoid and air cylinder working?
Check from the test output mode.
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⑥Is the thread cutting setting turned OFF?
Turn the thread cutting setting ON from the program mode.
Thread tightness is not right.
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①Isn't the needle thread tension too weak?
Adjust the needle thread tension.
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②Isn't the bobbin thread tension too weak?
Adjust the bobbin thread tension.
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③Is the strength of thread take-up spring adequate?
Adjust the needle thread take-up spring.
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④Is the presser foot height adequate?
Adjust the center press height.
Click here to adjust the top and bottom amount of presser foot.
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⑤Is the presser foot timing adequate?
Adjust the center press timing.
Thread does not get wiped.
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①Does the wiper interfere with the needle or presser foot?
Adjust the wiper height.
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②Is the wiper function turned OFF?
Set the wiper function ON.
A sewing pattern gets out of position.
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①Do you hold the sewing material adequately?
Adjust the external clamp.
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②Does the sewing material slide in the clamp?
Make sure to perform anti-slippery processing on the clamp.
The position gets shifted at restoring to the origin point.
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①Is the ambient temperature out of usage range?
Use in the ambient temperature of 5°C to 35°C.
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②Is the gap between the sensor and detection plate too large?
Adjust the gap between the sensor and detection plate to 1.0 to 1.5 mm.
