Common Sewing Machine Problems and Solutions
The most common causes of this problem:
- Wrong thread for the application.
- Quality defects in the thread.
- Inappropriate relationship in size between the thread and needle.
- Guides or eyelets worn or defective.
- Threading inappropriate.
- Excessive thread tension.
- Faulty or improperly placed needle.
- Needle heat.
- Defective or worn parts (protrusions or sharp in handling devices or stitch formation)
- Machine adjustment.
- Supply inappropriate.
- Improper handling of the operator.
- No pressure (Flagging).
If the ratio of the dimension between the needle and thread is inappropriate, the thread will not fit properly in the channel of the needle, and will occur a poor loop formation. (The thick needles work with thick yarns and thin needles with thin wires)
If the seam is not supported in a stationary position when the needle is rising, the cloth is lifted with the needle and the loop will not form properly. This condition is called loose or (flagging), is one of the most common causes that cause skipped stitches and stitches
burst. (Fix the tension on the foot)
Occur often skipping and / or split when crossing other seams. This problem can occur due to the extra thickness that the needle has to penetrate. This can put additional stress to the wire or cause the needle to bypass the device
stitch formation. However, many times when the jump occurs stitch or thread breakage after crossing the thick, usually this is the result of loose (flagging). This happens when the back of the presser foot continues to lobby fabric, while the front is not doing safely. Therefore, when the needle begins to rise, the fabric moves up with the needle and creates a bad LACING.
The elongation or stretching inherent in the thread is generally determined by the type of fiber. For example, nylon, polyester yarns, both have higher elongation than the threads made from 100% cotton.
Cotton yarns are stretched about 3% to 4% before it breaks. The polyester yarn is stretched approximately 17% to 20% before it breaks. The polyester thread has a higher elongation that contributes to greater flexibility and tolerance of the seam.
A key feature of our synthetic yarns developed to enhance the loop formation is the high initial modulus or initial resistance to stretching. A yarn with a high initial modulus minimize the amount of stretching of the yarn as the needle is approaches the bottom of the trail. So when the needle begins to rise, the thread will be relaxed and in this way will form a loop properly. (Mercerized yarns work best. Good quality thread produces a better job)
Note: Regardless of the type of thread that is being used, the more tension will be applied to the wire, it will stretch more, affecting the formation of the loop. Inadequate training of the appeal will result in a high frequency of interruptions of the seam. That’s why we recommend setting the system always thread handling the machine to sew with minimum thread tension.
Below is a recommended procedure to balance the stitch on any sewing machine:
1. Graduate thread tension below (or coil bracket [looper]) to a minimum so as to continue making a consistent stitch.
2. Reduce the thread tension of the needle into the stitch looks loose on the underside of the seam, and then adjust it again until you achieve a balanced stitch.