In addition to the left and right movements of the curved needle, there are also front (toward the operator) and back (away from the operator) movement. Be careful to place the looper at the limit of the left and right movement of the looper when the looper moves back and forth the fastest, and make the looper move back and forth to the minimum when it reaches the needle position. At this time, attention should be paid to both the left and right extreme positions. It is necessary to prevent the needle from scratching when the looper moves to the left and to prevent too much scratching of the needle when the looper moves to the right. Of course, you can also adjust the amount of movement of the looper back and forth and rotate the angle of the needle bar slightly clockwise to achieve the best results. Some machines can adjust the range of forward and backward movement of the looper, while others cannot.
When the needle is lowered to the lowest position, the distance between the curved needle tip and the right needle is 3-4mm. When the needle rises, the looper moves to the left, and when the looper tip reaches the center of the right needle, the bottom of the looper tip is 2.5mm above the eye of the needle. At this time, the gap between the looper and the needle is 0-0.05mm.
When the needle descends to the back of the looper, the eye of the left needle and the threading hole in the looper head meet. At this time, the back of the bend needle is allowed to slightly touch the needle, but it is best not to scratch or the lighter the better.
