Repair and adjustment standards for new sewing machines

In daily use, some problems may occur due to factors such as loose screws, displacement of parts, wear, collision, etc., which can cause blockage on the sutures. Common rheumatic diseases include floating lines, jumping lines, non circular spaces, broken lines, and wavy stitches. Please adjust according to the following methods:

1、 Floating line - the seam on the garment is too loose and floats on the surface
1. Tighten the wire clamp nut
2. Tighten the thread picking spring.
2、 Jump stitch - there is no connection between the garment piece and the seam
1. Fine tune the adjustment screw on the lifting joint, so that the bottom surface of the triangular tip in the circle touches the large needle diagonally to give way to the plane
2. Adjust the bias screw on the swing head of the large needle so that it is close to the bottom of the V-shaped groove when entering the hanging needle.
3. Adjust the large needle bracket so that the large needle comes into contact with the bearing, but not too tight.
4. Adjust the relative orientation of the two groove camshafts slightly, so that the large needle penetrates from the center or slightly above the center of the coil on the forming triangle. The circular triangle should be located at the center of the plane of the large needle when hooking.
3、 Broken line
1. Moderately loosen the wire clamp nut or use only a single wire clamp.
2. Loosen the thread picking spring.
3. Adjust the pain screw on the needle arm so that the large needle does not rub against the clothes hanging needle.
4. Adjust the nut on the rocker arm connecting rod to align the large needle with the center of the V-shaped groove of the clothes hanging needle.
5. Slightly adjust (rotate) the orientation of the small cam to keep the sewing needle tip in sync with the V-shaped groove of the hanging needle.
4、 Space not in a circle - stitching cannot be completed when there is a gap between the pieces
1. Fine tune the upper adjustment screw of the lifting joint or the bias screw on the large needle swing head to ensure the correct orientation of the circular triangle and the large needle.
2. Adjust the orientation of the bending plate, ensuring that the bottom edge of the square hole is flush with the center of the hanging needle, and that the large needle passes through the center of the square hole.
3. Fine tune the relative orientation of the left and right sides of the slot cam to allow the large needle to penetrate from the center or slightly above the vertical direction of the circular triangle. When forming a triangular hook line, it should be located at the center of the plane where the large needle gives way.
5、 Wave stitch - unclear or drifting stitch on the garment piece
1. The same row (column) of clothing pieces should be inserted into the hanging needle.
2. Carefully proofread the hanging pins to ensure that they are evenly spaced and have a consistent height.
3. Replace the deformed large needle (note that the tail of the newly replaced large needle should expose the end face of the needle seat by about 1.5mm, and ensure that the large needle enters the V-shaped groove near the bottom of the hanging needle when pointed)