A, jump line
1. The led is not on the bottom line
Reasons: (1) the bobbin thread is too short (2) the shuttle clamp with the door (3) the needle is too high, runs not hook loop
Solution: (1) the elongate spindle line (2) check whether the bottom line is stuck, and eliminate it
2. The needle bar up to move
Reasons: (1) needle bar hole, wear needle bar (2) needle bar connecting shaft screw loosening, needle bar displacement
Solution: (1) change the needle bar set, or selecting a new needle bar (2) of the needle, and screw down the fastening screws
3. Several needle jump line at a time
Abrasion reasons: (1) runs, runs, pointed is too dull (2) the needle is too high or too low
Solution: (1) (2) in runs adjust needle bar height or needle height, back to the needle
4. Continuous jump line or can't sew a needle
Reasons: (1) the quality is poor or machine machine needle bending ring can't normal production line (2) the needle is too high to clip wire ring, sewing the material and seam
Line, improper needle with three (3) use for a long time runs, serious wear and tear parts such as spindle bed or fold
Solution: (1) the replacement of qualified calibration machine or machine needle (2) to adjust the needle bar or needle height (3) runs normally replaced
Or shuttle on the bed, if necessary, to overhaul
5. Seam thin don't jump line, seam thickness jump line
Reasons: (1) the presser foot pressure is not enough (2) the needle is too thin (3) to cancel mechanism parts such as serious wear and tear
Solution: (1) (2) the pressure of the presser foot can be adjusted replacement pin (3) replacement parts, repair
6 seam thickness not jump, thin seam
Reasons: (1) the capacity of needle plate pinhole wear too big (2) the needle is too thick (3) at the bottom of the presser foot wear or presser foot pressure is too small
Solution: (1) change the needle plate (2) in fine needle (3) change the presser foot, or adjust the presser foot pressure
Second, the bolt
1. The first bolt, bolt head is cut
Reasons: (1) the upside or the machine machine needle no foot, the needle is too low, (2) the sewing the material hard, needle slants thin or presser foot pressure
Force is too large
Solution: install and check the machine needle bar connecting shaft screw is loose (2) more replacement needles or adjust the presser foot pressure
2. The stitching on both ends of wire break curls, and with a short beard
Reasons: (1) the thread clamp tight or suture in the sewing mix round (2) the stitches are runs into spindle bed guide groove (3) the stitches
Crisp easy knot, the poor quality of line parts have burrs
Solution: (1) pressure and adjust the thread clamp checked line to exclude mix round (2) check the wear condition of runs, replace if necessary
runs
3. The lower part of sewing the material product line, unable to form the stitch and bolt thread as horsetail
Reasons: (1) the feed dog is too low, sewing the material stalled product line and break (2) feed too much and pace pick line fill out broken (3) pressure
Foot needle loose, prevent sewing the material operation
The solution; (1) (2) adjust the feed dog up feed dog CAM position Angle, tighten the screw presser foot and needle
4. A sudden break in sewing line with fluctuations in on itself
Reasons (1) the spindle bed position didn't packed face into the spindle bed (2) a sudden shift in the bobbin sets not lock sewing quality is poor (3) runs
The bobbin spring is too long or spindle core set of ellipse
Solution: (1) to adjust the spindle bed location (2) reinstall the bobbin, in runs
5. A sudden break in sewing the bottom line
Reasons: (1) the bobbin sets is unqualified, inner ellipse, (2) the bobbin in the bobbin failure spring screw twist too tight, make the spindle skin pressure
Force is too small (3) the bobbin winder too full or too loose and disorderly (4) the bottom line of rotting brittle, knot, not through the bobbin spring the heart bottom
Solution: (1) the replacement of the bobbin set screws (2) unscrew the bobbin spring to rewind bobbin thread (3) to replace the bottom line
