The household sewing machine can t lead to the bottom line, what happens if the sewing machine doesn

It is possible that the large arc (pendulum shuttle) card is displaced, and then the machine is turned backwards, and the two small screws at the root of the pendulum shuttle are loosened, and then the left hand holds the tip of the pendulum shuttle against the needle, and the right hand shakes the pulley to the lowest point of the needle, and then continues to shake it up when the pinhole is just 1 5mm below the tip of the shuttle (that is, the thickness of the needle bar).

Note that the tip of the shuttle is just a haircut with the needle, and the needle is too tight to break the needle, too far to skip the needle, and then lock the two small screws. If there is still a jumper or the car can't afford to burn the line, it may be that the needle bar is displaced.

Sewing machine does not hook threads? The bottom line doesn't come? The master will teach you the solution.

Is it electric? Or is it a computer? If the computer is finished, it will not go to the bottom line. Or has it never been on the bottom line? If you don't go to the bottom line after cutting the thread, there is a problem with the thread cutting. If it is not directly on the bottom line, it is the wrong position of the hook.

The household sewing machine line and the bottom line are not hung is caused by the jumper, mainly due to the following reasons:

1. The needle is not installed correctly, and the upper and lower grooves on the needle are in the direction of the line.

2. There are burrs in the holes of the threading platen.

3. There is a burr on the top of the swing shuttle.

4. The distance between the top of the swing shuttle and the needle is too large, and the distance between the period should not exceed 1mm.

5. The swing shuttle is not synchronized with the needle, and the time difference is too large.

6. The bobbin shell and the swing shuttle support are not matched, and the bobbin shell is too wide.

7. The bobbin shell and the bobbin are not matched, and the bobbin is a little wide.

8. The upper and lower wire clamps are too tight.

9. The deviation between the shuttle and the swing shuttle.

10. The hook is out of position.

1. It is very likely that the bobbin wire is too short to cause the bottom line to be brought on the line, at this time, we can eliminate the amount of bobbin winding, * do not exceed 85% of the outer diameter of the bobbin. 2. The bobbin can be replaced with an aluminum bobbin, because the aluminum bobbin is light in weight and can reduce the inertia of the shaping movement, and the hook with anti-aircraft reed can also be selected. Wu Dan file 3, which piece of flannel can be padded at the bottom of the hook bobbin, so as to increase the resistance of the bobbin friction; The bobbin can also be reversed, that is, the direction of rotation of the bobbin is opposite to the direction of the movement inertia of the bobbin.

4. If there is a phenomenon of broken bottom line, it is likely that the bobbin wire is too full, too messy or too loose, at this time, the winder should be corrected to make the winding on the bobbin even, neat and compact.

Hello, dear, when the bottom line of the sewing machine does not come up, it may be caused by the following reasons: the line is incorrect: Confirm whether the line is correct, whether the bottom line passes through the bottom line leader, and whether the line is correct.

Incorrect Bottom Line Tension: Check if the bottom line tension is too tight or too loose, if it is too tight, it may cause the bottom line to not come up. You can try to adjust the bottom thread to make it suitable for sewing fabrics.

Wire Puller Problem: Confirm whether the cable lifter is installed correctly, if the wire puller is damaged or incorrectly installed, it will also cause the bottom line to not come up. The sewing machine needs to be cleaned:

Failure to do so can also be caused by too much dust on the sewing machine or the need for the machine to be noisily started for cleaning. It is possible to remove dust from the sewing machine, or to send the sewing machine to a professional for repair and maintenance. The sewing machine needs to change the needle:

The bottom line may also be due to the fact that the needle of the sewing machine has been blunted or needs to be replaced, so the needle needs to be replaced.

The household sewing machine line and the bottom line are not hung is caused by the jumper, mainly due to the following reasons:

1. The needle is not installed correctly, and the upper and lower grooves on the needle are in the direction of the line.

2. There are burrs in the holes of the threading platen.

3. There is a burr on the top of the swing shuttle.

4. The distance between the top of the swing shuttle and the needle is too large, and the distance between the period should not exceed 1mm.

5. The pendulum shuttle is not synchronized with the needle, and the time difference is there.

Too big. 6. The bobbin shell and the swing shuttle support are not matched, and the bobbin shell is too wide.

7. The bobbin shell and the bobbin are not matched, and the bobbin is a little wide.

8. The upper and lower wire clamps are too tight.

9. The deviation between the shuttle and the swing shuttle.

10. The hook is out of position.

The reason why the bottom line of the small sewing machine can't be brought up:

1. Analysis. The shuttle wire is too short, the shuttle wire is clamped in the shuttle door, and the needle is too high, and the swing shuttle cannot hook the wire loop.

2. Treatment method.

Lengthen the shuttle, check if the bottom line is stuck, and rule it out. If the needle bar connecting shaft is strong and the screw loosens the needle bar and moves up, the needle bar should be lowered, the needle should be realigned, and the fastening screw should be tightened.

Electric sewing machine jumper failure:

First, it can't lead to the bottom line.

1. Analysis: the shuttle wire is too short, the shuttle wire is clamped in the shuttle door, the needle is too high, and the swing shuttle cannot hook the wire loop.

2. Solution: Lengthen the shuttle line, check whether the bottom line is stuck, and eliminate the lack of acacia spikes. If the needle bar connecting shaft is strong and the screw loosens the needle bar and moves up, the needle bar should be lowered, the needle should be realigned, and the fastening screw should be tightened.

Second, the needle rod is moving.

1. Volvo analysis: needle bar hole, needle bar wear, loose needle bar connecting screws, needle bar displacement.

2. Treatment method: change the needle bar sleeve, or choose a new needle bar and re-align the needle; and tighten the set screw.

3. Skip a needle after a number of needles.

1. Analysis: the pendulum hook is worn, the tip of the pendulum hook is too blunt, and the needle is too high or too low.

2. Treatment method: change the swing shuttle, adjust the height of the needle bar or the height of the needle, and re-align the needle.

Fourth, continuous jumpers or a stitch can not be sewn.

1. Analysis: Poor needle quality or needle bending can not produce wire loops normally. The needle is too high, the thread loop cannot be hooked, and the sewing machine clearly shouts that the needle is not properly matched. Long-term use of swing shuttle, swing bed and other parts are seriously worn or folded.

2. Treatment method: replace the qualified needle or straighten the needle. Adjust the height of the needle bar or needle. In general, the shuttle or shuttle bed can be replaced, and overhaul can be carried out if necessary.

Fifth, the sewing is thin and does not jump, and the sewing is thick.

1. Analysis: the pressure of the presser foot is not enough, the needle is too thin, and the hooking mechanism and other parts are seriously worn.

2. Solution: adjust the pressure of the presser foot, change the needle, replace the parts, and repair.

Sixth, sew thick jumpers, sew thin jumpers.

1. Analysis: the pinhole of the needle plate is too worn, the needle is too thick, the bottom of the presser foot is worn, or the pressure of the presser foot is too small.

2. Solution: Replace the needle board of the electric sewing machine, change the fine needle, change the presser foot, change the presser foot, or adjust the pressure of the presser foot. <>