As for the frequent sewing machine fault, often need to stop machine waiting for repair, and many machines problem is a common phenomenon, these common fault line management or if workers can master the basic methods, work to help a lot. Here to analyze machine common fault processing method:

A, skipping

(a) accidental jumps.

One reason: the machine needle hair, needle bent, needle groove is not smooth or improper selection.

Method: replace the new machine needle

Reason two: the machine needle installs the slanting, the machine needle and the rotating shuttle distance are improper

Exclude Methods: to adjust the distance between the needle and the spindle, so that it is within the standard range

Three reasons: the seam thickness unevenness, twist irregularity, influence the formation of a loop.

Method: according to the standard selection of good quality sewing thread

Reason four: the height of the needle bar is not right

Method: adjust the height of the needle

Reason five: spindle nose wear

Elimination method: grinding, polishing

Reason six: presser foot pressure is too small, suture jitter, pressure line, affect the ring

Exclusion method: increase presser foot pressure

Reason seven: presser foot The groove is too wide, when the needle is pulled out of the fabric, the fabric rises to affect the formation of the ring, which is the most influential when sewing thin materials

Method: according to the fabric will press the foot to the left, right, can be filled with a wide slot solder

Reason eight: pick line spring is too low, fabric, needle, line matching inappropriate

Troubleshooting: appropriate tall wire spring.

Nine reasons: the needle plate hole too, when sewing thin fabric fabric randomly dropped, delayed formation of loop.

Elimination method; replace new plate.

Reason ten: spindle positioning is not standard, shuttle tip and needle distance is too far Elimination method: according to the standard adjustment

(two) consecutive jumps

The first reason: when high-speed sewing machine needle and wire heating, so that the suture softening, it is difficult to form the ideal line

Elimination method: the use of chemical fiber line high-speed sewing, can be used in the face of the line over the addition of silicone oil cooling, or the use of compressed air blowing cooling machine needle

Reason two: too much tension on the line, the suture is subject to greater stretch, the line is not easy to form

Elimination method: adjust the tension on the line, so that the sewing thread in the sewing material under the tension as small as possible

Three reasons: the transition of different sewing thickness A sewing or elastic fabric with different hardness, caused by skipping.

Method: according to the fabric thickness and properties, with the size of the timely adjustment of the various components of the machine. The thickness of excessive, slow down the speed of sewing.

Two, section (upper) line

The lock stitch is made up of the line and the assembly line, so it can be divided into two types: the section line and the bottom line

(a) flat sewing machine on the line is broken

1 reasons: machine needle installed or needle handle is not in place

Method: check the needle and needle handle 2 reasons: two

Check out the direction of rotation of the upper wheel

3 reasons three: too much pressure on the line tensioner

Method: check the tension device is normal

4 reasons four: on-line wear lead order is not required

Exclusion method: according to the requirements of the line

5 reason five: assembly is not up to the requirements

Method: check the location of the hook and the shuttle, the needle and the shuttle between the gap

(two) normal sewing process interrupted surface

1 reasons: sewing machine needle or improper cooperation Method: choose the machine needle and thread which is suitable to the fabric

2 reasons two: sewing thread quality is not good

The method is used to select the sewing thread with high strength

3 reasons three: pinhole edge is not smooth or needle slot burr

Method: polishing

4 reasons four: the shuttle mouth or shuttle tip burr, scar or finish is not enough

Method: using triangular stone, polishing paste, polishing gap.

5 reason five: pick line spring is too tight, too high, not flexible or clamp the pressure is not uniform

Elimination method: Adjust the height of the take-up spring and adjust the clamping pressure

6 reasons: Six take-up spring tightly, loss of elasticity, the hook when running the door up, suture is blocked.

Troubleshooting: door will bottom spring extended or renewed.

7 reasons seven: needle overheating, suture was blown

Exclusion method: the needle heat strategy

8 reasons: eight line line surface hole part picking, blocked sewing thread movement.

Troubleshooting: polished with emery cloth, then coated with polishing paste line pull grinding or polishing smooth.

(three) reverse break

1 reasons one: The feeding cloth and the machine needle are not fit properly

Elimination method: according to the standard to adjust the cloth and the machine needle

2 reasons two: the line through the site is not smooth

Method of elimination: the surface of the seam line will be polished

Three, break the bottom line (offline)

1 reasons: a cloth feeding tooth edge angle.

Method: wipe with gauze or polishing

2 reasons: two, the location of the cloth feeding teeth is too low, when the wire off the line and the bottom of the feed cloth contact, the suture will be broken

Method: adjust the high and low position 3 reasons: three line due to wear and wear shuttle skin export line gap.

Exclusion method: replacement

4 reasons: four bobbin winding is too full, outlet is not straightforward.

Exclusion method: the bottom line should not be higher than the shuttle core

5 reasons: five spin off edge shuttle skin hair, rub the bottom line.

Troubleshooting: rotary grinding edge light shuttle skin.

6 reasons: the bobbin and bobbin with six accuracy, cyclical retie phenomenon.

Troubleshooting: check the bobbin and bobbin, observe the outlet tension is uniform. 7 reasons seven: rotating shuttle quality problems

Troubleshooting: check in the rotating shuttle frame at the upper left side of the outlet groove.

Four, floating bottom or surface line

1 reasons: the bottom line, the surface tension is too large or too small

Troubleshooting: adjust the clamp nut and screw adjusting shuttle skin.

2 the reason two: send cloth teeth and machine needle and pick line rod movement with improper

Method: adjust the position of the needle and the feeding mechanism

Five, towel like floating line

1 reasons: a hook beak and plane rough, scratches, resulting in disruption to tighten the line .

The method of removing the thread of the rotating shuttle

2 reasons two: sewing thread around the hook flange, so that the line is not smooth

Method: remove the stitching around the hook

Six, floating line floating when floating

1 reasons: the shuttle core and shuttle core sleeve is not allowed

Elimination method: choose the suitable shuttle core and shuttle core sleeve

2 reasons two: pressure toe plate outlet groove is too shallow too short, can not withstand the line

Method: by drawing spinning cloth, pressure plate outlet groove of elongated toes

Seven, broken needle (a) occasional needle breakage

1 reasons: a needle bent needle, needle or hair fixed screws are not tightened.

Troubleshooting: replace or tighten.

2 reasons: two sewing speed too fast seam uneven thickness of bag material, machine needle offset, caused by the broken needle.

Elimination: should be appropriate to slow down

3 reasons three: the operator action is not coordinated, sewing sewing material is too complex, so that the needle shift, and the needle plate collision

Elimination method: correct use, action to coordinate

(two) continuous broken needle 1 reasons: the presser foot fixing screws are not tightened.

Troubleshooting: foot screws and foot position, check the pressure screw.

2 reason two: the needle plate is narrow, the pinhole and the machine needle coaxial error is too big

Method: re - insert the needle plate or adjust the needle plate screw, until the machine needle and needle plate hole coaxial error within 0.2mm

3 reason three: machine needle and send cloth teeth with bad, not synchronous

The method of adjusting the movement of the machine needle and the feeding teeth

4 reasons four: needle stroke Not correct, and other agencies with improper movement

Exclusion method: check the machine needle stroke crank screw is fastened in the groove

Eight, to send cloth bad, hysteresis cloth before

1 reasons: presser foot pressure

Elimination method: small pressure foot pressure

2 reason two: send cloth teeth tilt

The method of removing the position of the feeding teeth is accurate

3 reason three: send cloth teeth position is too low

The method of adjusting the distance of the cloth feeding teeth to expose the needle plate is correct 4 reasons four: presser foot pressure is too small or the bottom of the foot is not smooth

Troubleshooting: increase the foot pressure or bottom pressure foot repair.

5 reasons five: the knife is too high, or cutting knife is too blunt

Exclusion method: after grinding installation in place

6 reasons: Six feeding parts wear, with too loose.

Exclusion: renovation and adjustment

Nine, fabric wrinkle

1 reasons: the movement speed of the cloth feeding teeth is greater than that of the needle bar

Method: speed to standard or slightly slower than needle Rod velocity at

2 reason two: the location of the feeding teeth is not accurate

Method: the position of the cloth will be adjusted or transferred to the state of high and low, so that the surface of the sole and the contact surface of the feeding teeth can be reduced to prevent wrinkling

3 reasons three: send cloth teeth out of the needle plate too much

The method of adjusting the distance of the cloth feeding teeth to expose the needle plate, when the fabric is thin, the cloth feeding teeth is higher than that of the needle plate 0.6mm

4 reasons four: the machine needle is too thick

Exclusion method: replacement machine needle,

Ten, bad track (a) uneven length of stitch

1 reasons: sewing machine speed is high

Exclusion method: reduce the speed within the scope of permission

2 reasons two: pressure foot pressure is weak

Elimination: appropriate increase pressure

3 reasons: three, the line tension, or small tension

Elimination: small or increase the tension

(two) line skew

1 reasons: to send cloth teeth and presser foot plane is not parallel

Method: grinding or replacement

2 reasons two: the needle rod and the needle rod Position is not correct

Exclusion method: the positive wire hook and the wire sleeve

Eleven, poor lubrication

1 reasons: oil tank oil level is too low

Exclusion method: according to the requirements of lubricating oil to two lines

2 reason two: the oil way is blocked, the oil strainer is blocked, the oil absorption line is short

Exclusion: dredge, check and replace