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Operation points of sewing machine
2024-05-24
Key points of operation
(1) Threading: Threading needle and thread and looper thread in the prescribed order, otherwise it will cause no sewing, thread breakage or jumper;
(2) The tension of the thread: The tightness of the thread is an important aspect of successful sewing. Improper adjustment will cause thread breakage, needle skipping and scratching the bag. Relax the tension regulator of heavy material (such as gunny bag) thread slightly; tighten the thread tension regulator of light material; adjust the feed rate of thread according to the difference of needle pitch and bag thickness; when adjusting the tightness of needle thread, adjust the tightness of looper thread accordingly.
(3) presser foot pressure: if the reverse side of the sewing thread looks like a mark cut by the delivery tooth, or the actual needle pitch is smaller than the preset delivery tooth feed speed, the pressure is too high, and the needle plate spring adjusting screw should be loosened at this time; If the stitching is not straight or uniform, the needle plate spring adjusting screw should be tightened to increase the pressure. In addition, reduce the pressure when sewing sacks and other heavy materials, increase the pressure when sewing plastic bags and other lightweight materials.
(4) Adjustment of the looper: Turn the pulley along the forward direction and adjust the bell crank so that the broken end of the looper is 7mm away from the center line of the needle when the needle is in the stowed position;
(5) Adjustment of feed mechanism: the feed tooth should not touch the needle plate when passing through, and there should be a gap of 1.5mm between the middle tooth of the front feed tooth and the needle plate; The rear feeder is 0.1mm lower than the front feeder, and the stitch width can be adjusted from 7mm to 11.5mm as required. When changing the width of the stitch, the needle guide plate will be adjusted accordingly because the gap between the needle guide plate and the needle will also change.
(6) Adjustment of scissors: In order to make the upper/lower blades bite, manually move the upper blade. When the two blades bite, adjust the gap between the tail ends of the two blades to 0.1-0.2mm
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