What Are The Faults In Sewing? What Are The Processing Methods?

It is a machine that uses one or more sewing threads to form one or more stitches on the sewing material to interweave or stitch one or more stitches.

However, if sewing machines are used for a long time, there will be some faults. Let's look at the common faults and handling methods of sewing machines.

Failure in feeding

1, fault characteristics: sewing material wrinkle.

Product reason: the machine needle broken point, the bottom line tension is too big, the differential mechanism adjustment is improper.

Processing method: replace the new machine needle, loosen the shuttle spring screw, and re adjust the differential mechanism.

2, fault characteristics: under the seam material is "gnawing" to form lattice teeth marks.

Product reason: the tip of the cloth is too sharp and the presser foot pressure is too high.

Processing method: use oil stone to sharpen tooth tip and unscrew the pressure adjusting screw.

3, fault characteristics:

The following thread breaks the sound of fibers when sewing.

Product reason: needle tip is too sharp or too blunt.

How to do this: change the needle.

4, fault characteristics: sewing materials stagnate.

Product reason: the feeding tooth is too low and the presser foot pressure is too large.

Treatment: raise the delivery tooth and tighten the adjusting screw.

5, fault characteristics: sewing material back and forth.

Product reason: the delivery tooth is too high.

Treatment: adjust the delivery teeth.

6, fault characteristics: seam can not be sewn back.

Product reason: cloth feeding cam shift.

Processing method: adjust the position of the feeding cam.

7. Fault feature: the slit material is irregular.

Product causes: loose teeth or loose teeth.

Treatment: correct the feeding tooth and tighten the screws.

Line fault

1, fault characteristics: face line floating.

Product reason: clamp wire pressure is too small.

Processing method: tighten the clamping line and increase the tension of cotton yarn.

2, fault characteristics: the bottom line is floating.

Product reason: Shuttle spring is too loose.

Processing method: tighten shuttle spindle spring screw, increase the bottom line tension.

3, fault characteristics: needle distance is long and short.

Product reason: presser foot pressure is too small.

Processing method: tighten the adjusting screw.

4, fault characteristics: under the sewing material, each needle is covered with a towel sleeve.

Product reason: cloth feeding and thread picking are not suitable, and cloth feeding is fast.

Processing method: adjust the delivery cam screws to make the cloth delivery and the thread take-up move in harmony.

Operational failures

1, fault characteristics: head rotation stagnant.

Product reason: wrong lubricant was added, especially vegetable oil.

There are too many dirt in the shuttle bed, and the connecting rod screws and the garden cone screws are too tight.

Treatment: after washing with kerosene, reassemble the sewing machine oil.

Clean the shuttle bed and loose the screws to ensure a certain gap.

2, fault characteristics: when pferring, half circle is stagnant, half circle is light or slippery, or there is a stagnation point in every round.

The spindle of the shuttle bed is not only half circle but also accompanied by violent jitter and noise when the thread is running.

Product reason: the position of the feeding tooth is high or the dirt is accumulated inside the tooth seam, which makes the delivery tooth touch up with the needle plate when it rises.

Methods of treatment:

And add a little sewing oil.

Cleaning or lowering the delivery teeth.

Replace or straighten the needle bar.

3, fault feature: the nose is jammed and cannot move.

Product reason: the position of the feeding tooth is too close or too backward to touch the needle plate.

The needle bar installation position is too high, the needle clip touches the shell.

Treatment: adjust the position of the feeding tooth, re adjust the needle and adjust the height of the needle bar.

4. Fault feature: noise comes from needle mechanism.

Product reason: needle bar, needle bar sleeve, small connecting rod and so on are too big to move.

Small connecting rod screw rod crank screw loose.

Treatment: replace new parts and tighten them.

5. Fault feature: noise comes from feeding mechanism.

Product reason: big top garden cone screw wear or loose, send cloth tooth touch needle plate, needle distance adjustment mechanism loose.

Treatment: grinding or readjustment, readjustment, readjustment or tightening of screws.

6. Fault feature: noise comes from swing mechanism.

Product causes: the shuttle and shuttle bed wear cause large clearance, and the clearance between the shuttle and the pendulum is too large, resulting in impact.

Treatment: replace new parts, adjust or replace new ones.

7. Fault feature: general noise.

Product reason: the upper shaft, the lower shaft and the axle sleeve wear, causing the movement up and down, and the machine is short of oil.

How to deal with it: replace new parts, adjust the clearance between upper and lower shaft planes, pay attention to maintenance and fuel on time.

Broken needle

1, fault characteristics: sewing thick material broken needle.

Product reason: the machine needle is too thin or bent, the thickness of the sewing material is uneven, and the needle bar is too big to move.

How to deal with it: replace the new thick needle, adapt to slow down the sewing speed and use hand to help feed, replace the new needle bar or needle bar sleeve.

2, fault characteristics: short needle distance needle, long needle distance broken needle.

Product reason: the action of sending cloth teeth is delayed, the delivery tooth is not qualified, the machine needle touches the back ends of the cloth teeth and breaks the needle.

Processing method: the location of the feeding cam should be adjusted, and the stitch distance should be shortened or the new delivery tooth should be replaced.

3. Fault feature: the needle is broken under the needle plate.

The reason is: the needle position is low, the machine needle hits the shuttle shuttle, the shuttle bed is not installed, the shuttle needle touches the needle, the pendulum and the machine needle end two gaps are too small or too big, the pendulum touches the needle or loses the guard needle function.

Processing method: adjust the position of the needle bar or machine needle, re install the shuttle, adjust the clearance between the pendulum and the needle.

4. Fault feature: the needle is broken on the needle plate.

Product reason: the hand sewing material is too strong, causing the machine needle to bend, the foot screw loosening, causing the foot to skew and touch the needle. The displacement of the cloth cam causes the sewing machine to break the needle, and there are hard objects in the sewing material to break the needle.

How to do this: strengthen the operation practice, adjust the presser foot, tighten the screws, adjust the position of the feeding cam screw.

Broken line

1, fault characteristics: the first needle is broken, and the broken head is cut.

Product reason: the machine needle is loaded or the machine needle is not loaded enough, resulting in the needle is too low.

The slit material is hard, the machine needle is too thin or the presser foot pressure is too large.

How to do this: check the installation of the needle and whether the screw shaft of the needle bar is loose.

Replace machine needle or adjust presser foot pressure.

2. Fault feature: the suture is curled at both ends of the broken ends and has short whiskers.

Product reason: tighten thread or sewing thread when sewing.

The suture was squeezed into the guide slot of the shuttle bed.

The stitches are crisp, brittle, easy to knot, poor in quality and burr in the thread.

How to do this: change the pressure of the clamp wire and check the line and exclude the winding.

Check the wear of the shuttle, and replace the shuttle when necessary.

Sanding lines and replacing stitches.

3, fault characteristics: the bottom of the sewing material is heavy, and it can not form the needle distance and break the thread.

Product reason: the delivery tooth is too low, the material is stopped and the product line is broken.

The cloth was broken with the line.

Press foot, machine needle loose, obstruct seam material operation.

How to deal with it: raise the delivery tooth, adjust the positioning angle of the delivery cam, fasten the presser foot and machine screw.

4, fault characteristics: sewing in a sudden disconnection, the surface line has a curved wave.

Product reason: shuttle bed position has not been loaded into the shuttle bed.

A sudden shift in the lock or sewing process.

The quality of the shuttle is bad, the spindle spring is too long or the inner sleeve is elliptical.

Treatment: re adjust the shuttle bed position, re install shuttle, heart swap shuttle.

5, fault feature: suddenly break the bottom line in sewing.

The spindle sleeve is not qualified, and the inner diameter is elliptical.

Product reason: the spindle sleeve is not qualified, and the inner diameter is elliptical, causing the spindle rotation to fail.

The screw of shuttle nut is screwed too tightly so that the pressure of the shuttle is too small.

The spindle winding is too full or too loose and messy.

The bottom line is crisp and has a knot, so that the bottom can not pass through the shuttles spring.

Treatment: change the spindle sleeve, screw the screw, rewound the spindle, and replace the bottom line.

Jumper

1, fault characteristics: can not lead to the bottom line.

Product reason: Shuttle line is too short, shuttle wire clip is in shuttles, machine needle is too high, swing shuttle can not hook up wire loop.

How to do this: lengthen the shuttle line and check whether the bottom line is jammed and exclude it.

The needle bar connection shaft is strong screw loosening needle bar moves upward, should reduce the needle bar, re tighten the pin to the needle.

2, fault feature: needle bar moving.

Product causes: needle rod hole, needle rod wear, needle bar connection screw loosening, needle bar displacement.

How to do this: change the needle bar sleeve, or select new needle bar, re pair the needle, and tighten the screws firmly.

3, fault characteristics: over a number of needle jumping a needle and thread.

Product cause: swing wear, pendulum point too blunt, machine needle too high or too low.

How to deal with it: swinging the shuttle, adjusting the height of the needle bar or the height of the needle, and re adjusting the needle.

4, fault characteristics: continuous jumpers or stitches can not be stitched.

Product reason: poor quality of machine needle or bending of machine needle can not produce normal thread ring.

The machine needle is too high to hold the thread loop, and the sewing machine needle is mismatched with the three needles.

Long term use of swing shuttle, pendulum bed and other components seriously wear or fold.

The way of processing is to change qualified machine needle or straightening machine needle.

Adjust needle bar or needle height.

In general, shuttle carriers or shuttle beds can be replaced and overhauled if necessary.

5, fault characteristics: thin thin, no jumpers, thick thread jumpers.

Product reason: foot pressure is not enough, machine needle is too thin, hook mechanism and other parts are seriously worn.

Treatment: adjust foot pressure, replacement pin and replacement parts for repair.

6, fault characteristics: thick thick jumper, thin thin jumper.

Product reason: needle plate wear too large, needle is too thick, the bottom of the presser foot is worn, or the pressure of the presser foot is too small.

Processing methods: replacing needle plate, changing fine needle, changing presser foot, changing presser foot, or adjusting presser foot pressure.