The situation where a sewing machine suddenly begins to sew back or form chaotic loops is familiar to many craftsmen, from beginners to professionals. This phenomenon not only stops the workflow, but can also spoil expensive fabric, requiring a complex and long unpacking. Often this hides a banal error in filling the thread or contamination of the mechanism, but sometimes the problem lies in more serious mechanical malfunctions.
In this article, we will discuss all possible reasons why sewing-machine It is unpredictable and we will offer specific methods to eliminate it. You will learn to distinguish between symptoms of incorrect settings and real breakdowns that require specialist intervention. It is important to understand that most problems are solved independently without a master, if you act consistently and carefully.
Before you look at the nodes, it is worth noting that modern models, whether they are classical ones, are not the only ones. Zinger computerized BrotherThey have similar principles of shuttle operation. Therefore, the fault search algorithm will be universal for most devices on the market. We will look at both the mechanical and electrical aspects of your equipment.
Errors in the top thread refill and their effect on the stitch
The most common reason why the machine begins to “five” fabric or do back stitches is a banal violation of the rules of refueling. If the thread didn't hit. tensioner or a nitrogen ruler is missed, the mechanism cannot form the correct nodule. As a result, the top thread loosely dangles, and the needle drags it down, creating the illusion of sewing back or forming loops.
Often users forget to lower the foot before starting sewing, which automatically opens the tension discs. In this state, the thread does not receive the desired resistance, and the stitch is loose and uncontrollable. It is also worth checking whether the coil is inserted correctly: if it jumps or rotates in jerks, uniform feeding of the material becomes impossible.
⚠️ Warning: Never pull the cloth with your hands while the machine is running while trying to correct the direction of the seam. This can lead to breakage of the needle and damage to the mechanism of tissue promotion.
To correct the situation, you need to completely straighten the thread and fill it again, strictly following the scheme on the body of your device. Make sure that the thread lies in all the guide grooves and is tightly pressed with the paw lowered.
☑️ Filling the thread correctly
Problems with lower nitrogen and shuttle device
If the top gas station is fine, but the machine still sews with defects, you should pay attention to the bottom thread. Excessive or too weak tension of the thread in shuttle often leads to the fact that the stitches lie incorrectly, creating a reverse effect or knocking the rhythm of the tissue progression. This is especially true for machines with horizontal shuttles, where the exact installation of the spools is important.
Mud and villi accumulated in the shuttle area can block the free rotation of the spools. When the spools get stuck even for a split second, the upper thread is pulled out excessively, and the mechanism begins to work idly or pull the fabric back. Regular cleaning of this unit is a mandatory procedure for stable work.
Also check if the squirrel itself is deformed. Plastic spools from cheap counterparts can have uneven edges that cling to the shuttle body. Metal spools may rust or have burrs that interfere with the smooth running of the thread.
Use only the original spools recommended by the manufacturer of your model. Inappropriate size or height of the sides of the spools can disrupt the operation of the entire shuttle mechanism.
Failures of the tissue promotion mechanism (reiki)
When the machine is sewing back, it is often the fault of the mechanism that is supposed to move the fabric forward. Reiki promotion (dented comb) can be lowered to the lower position by a special lever designed for sewing buttons or stems. In this mode, the tissue does not move forward or backward, and the needle works in place, which can be perceived as a failure.
Another reason is wear or breakage of the reiki teeth. If they are slicked or broken, the tissue will slip. In some cases, a fragment of a needle or a piece of tissue gets stuck under the slats, blocking their movement. The mechanism tries to push the fabric, but due to the obstacle can jerk in the opposite direction.
There is also a possibility of weakening the screws that attach the rack to the shaft. If the fixation is broken, the rake can dangle and move chaoticly, including in the opposite direction at a certain position of the shaft. This requires disassembling the bottom of the car for visual inspection.
Needle deformation and problems with the choice of accessories
A curved or dull needle is the killer of a quality stitch. When the needle's tip is blunted or shifted, it enters the tissue at the wrong angle. Instead of pushing the material forward, the needle can grab the fibers and pull them back, especially on dense or sliding tissues. This creates the illusion that the machine is sewing in the opposite direction.
It is important to select the type of needle for a specific material. For example, knitwear requires a needle with a rounded edge (Jersey) and the jeans, reinforced needle marked Denim. Using a universal needle for complex materials often results in stitches skipping and chaotic behavior of the fabric under the foot.
Pay attention to the size of the needle as well. A needle too thin for thick tissue will bend with each puncture, changing the trajectory of movement. A needle too thick for thin fabric will create large holes that can be tightened unevenly by the thread.
Failures in the electronics and control pedal
In modern computerized models, an electronic control unit is responsible for the direction and speed of the tissue movement. If a software failure occurs, the machine may misinterpret signals and give a command to reverse. This is a rare but possible case, especially after power surges in the network.
The control pedal (speed regulator) can also be a source of problems. If the contacts inside the pedal are oxidized or contaminated, the signal may be transmitted intermittently. The machine can jerk sharply, stop or simulate a reverse course due to surges in the speed of rotation of the shaft.
⚠️ Warning: If you suspect a malfunction of the electronics or pedal, immediately disconnect the device from the network. Attempts to repair the electrical part without proper knowledge are life-threatening.
For diagnosis, try to connect the car to another outlet or replace the pedal with a known serviceable one, if there is such a possibility. If the problem persists, it is most likely the internal management fee.
How to reset the settings of the electronic block?
In many models, to reset errors, you need to turn off the machine, pinch the combination of buttons (often it is the reverse and start / stop button) and, holding them, turn on the power. Find the exact combination in the instructions for your model.
Diagnostic table: Comparison of symptoms and causes
To find the reason why yours is faster sewing-machine Behaving strangely, use the summary table. It will help to weed out unnecessary options and focus on the main thing.
| Symptoms. | Probable cause | Method of decision |
|---|---|---|
| The fabric is standing still, the needle hits one point. | Promotion racks down | Raise the lever of lowering the reiki |
| The thread gets tangled from below, loops form. | Incorrect filling of the top or dirt in the shuttle | Refill the thread, clean the shuttle. |
| The machine pulls the fabric back in jerks. | Dumb or curved needle | Replace the needle with a new one |
| You hear a hum, but the seam is not forming. | The thread jumped off the needle driver's lever. | Fill the thread into the last guide |
| Missing stitches on thick fabric | Inappropriate type or size of needle | Install a larger needle (No. 100-110) |
Prevention and proper care of the mechanism
Regular maintenance is the key to the long life of your equipment. Dust, mixed with engine oil, turns into an abrasive paste, which in one season can drain important nodes of friction. Therefore, cleaning should be carried out not only when the machine began to sew poorly, but planned, after each large project.
Use only special oils for sewing machines. Conventional engine oil or WD-40 can thicken over time or damage plastic parts of modern machinery. Lubricate only the points specified in the instructions, avoiding oil on electrical contacts and rubber belts.
Keep the car covered to minimize dust entering the body. If you do not use the machine for a long time, it is better to remove the needle and foot, relaxing the tension of the threads. This will keep the springs and mechanisms in working condition.
90% of problems with the quality of the seam and the direction of movement of the fabric are solved by replacing the needle, correct filling of the thread and cleaning the shuttle assembly.
Why does the machine only sew back on certain areas of fabric?
This may indicate uneven tissue thickness or the presence of thickened seams that the propulsion mechanism cannot overcome. It is also possible that in this place the fabric has a slippery structure, and the reiki teeth simply slip. Try using a special foot for complex fabrics or putting a strip of paper under the seam.
Can I sew back on the typewriter without the reverse function?
On older mechanical models without a backstroke button, the sewing function was performed manually, turning the flywheel on itself. However, this can not be done during the operation of the engine - this will lead to a breakdown of the mechanism. To fix the seam on such machines leave long ends of threads and tie them with a knot.
What if the machine gets worse after cleaning?
Probably, during the assembly, the sequence of installation of parts was broken or the tension of the thread was incorrectly exposed. Check if all screws are tightened and if the shuttle design is assembled exactly as before disassembly. Sometimes it is necessary to adjust the gap between the needle and the shuttle again.