How to adjust the upper thread of flat car sewing machines and computerized sewing machines if the upper thread is not pressed on the presser foot and needs to be short?

Set the stop to the upper needle stop

Don’t tighten the small thread clamp

Secondly, look at the large thread clamp when trimming

Is it open?

If not

Just push the thread clamp inwards

But not too far

Otherwise, slightly thicker fabrics will push up the thread clamp

Floating threads will appear at the bottom of the fabric

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