The situation when your faithful sewing-machine suddenly ceases to perform its functions, can catch even an experienced seamstress by surprise. Instead of a straight line, you see a tangled tangle of threads, a loop from below, or you hear only the hum of the motor without the needle moving. This is a common problem that is most often solved without a master.
Before panicking and looking for contacts of the service center, it is necessary to conduct a primary diagnosis. 80% of the time breakdown It is only a failure in the settings or improper filling of the thread. Let’s look at the main symptoms and methods of their elimination.
Diagnostics of thread problems and looping
The most common complaint is that the machine “miss” stitches or makes them from the bottom of the fabric in the form of loops. This is a classic sign of tension disturbance or improper operation. shuttle-knot. If the thread gets confused, first check the quality of filling the top thread.
The thread must pass freely through all the guide hooks. If you miss at least one element, tension It's broken. Also pay attention to the spools cap: the thread in it should move with a little effort, and not fly out freely.
⚠️ Warning: Never adjust the tension of the top thread if the machine is not properly fueled. This will lead to even more confusion and possible failure of the mechanism.
Often the cause is a dull or deformed needle. Even a microscopic burr on the tip can tear tissue fibers and spoil the thread. Replace. needle You can get a new type of tissue, and the problem can disappear instantly.
Problems with needle and number selection
An incorrectly selected needle is the number one enemy for a quality line. If you sew a jean with a silk needle, it will bend, skip stitches and create a characteristic knock. Conversely, a needle that is too thick will leave holes in the thin fabric.
Pay attention to the position of the needle in the needle holder. It should be placed on the right side (shoulder) in the right direction. For most household machines Janome or Bernina The bald looks to the right, but some models Singer It can be pointed backwards.
Here is a table of needle and tissue matching, which will help avoid errors:
| tissue | Recommended needle number | Point type |
|---|---|---|
| Silk, chiffon. | 60-70 | Sharp. |
| Cotton, linen. | 80-90 | Sharp. |
| Jeansa, coat. | 100-110 | Enhanced. |
| Knitting, stretching. | 75-90 | Rounded. |
If the needle is installed crooked or not to the end, it will touch the foot or needle plate, which will lead to breakage. needle-driver.
Tissue Stucking and Problems with Promotion
When the fabric stands up and does not move under the foot, the promotion rack is often to blame. It can be lowered to sew buttons or simply clogged with pile and threads. Clearing the space under needle-plate often solves the problem.
Check if the leg lever is lowered. If the foot is raised, the fabric does not press against the slats, and they slide on it for nothing. This is a common but common mistake, especially for beginners.
Another reason is too much tension of the thread. The machine sort of "picks" the fabric, creating an obstacle to progress. Relax the tension regulator and try to make a test seam on the patch.
⚠️ Note: Do not pull the fabric forward or backwards with your hands while sewing. This leads to breaking the needle and curvature of the line. The machine must push the material itself.
If you are sewing thick stitches or jeans, it is possible that the machine lacks power or stride length. Increase the length of the stitch with a regulator so that the rack can confidently capture the dense material.
Noise, knocking and vibration when working
Extraneous sounds are a signal of a mechanical problem. If the machine began to hum louder than usual, check the purity of the shuttle. Buried there "coat" of dust and pile violates the lubrication and operation of rubbing parts.
The knock can emit an incorrectly inserted needle that touches the needle plate. The source of noise is often also pin-capIf it gets dirty or it is deformed.
How to properly lubricate the machine?
For lubrication, use only special oil for sewing machines. Apply 1-2 drops to the places of friction of the shuttle shaft and needle driver. After lubrication, be sure to run the machine idling on a piece of fabric to remove excess oil, otherwise they will stain your work.
Vibration of the body can be caused by improper installation of the machine on the table. Make sure all legs are firmly on the surface, and the drive belt (if any) is not twisted and dangled.
The machine doesn't grab the bottom thread.
This is one of the most annoying problems: the top thread is there, and the bottom one does not come out. Most often the reason lies in the wrong installation of the spools cap. The thread should come out from under the spring plate with a characteristic click.
If the cap is installed correctly, the problem may be in the desynchronization of the needle and shuttle. The needle should fall to the lowest position, and the nose of the shuttle at this moment pass slightly above the ear of the needle. If the gap is broken, the loop does not form.
☑️ Testing for thread capture
In some cases, the thread is not captured because it is pulled out of the spools too quickly. Try holding the bottom thread with your left hand when you start sewing.
Cleaning and basic maintenance
Regular cleaning is the key to the long life of your equipment. Remove the needle plate and clean all available places with a soft brush. Use compressed air or pear to blow dust out of hard-to-reach places.
Remember to change the needle after each large project or every 8-10 hours of work. A dulled needle spoils not only the fabric, but also creates an extra load on the engine.
Always lower the needle into the fabric before tearing the thread and removing the work. This will prevent the thread from jumping off the needle driver the next time it is turned on.
Keep the machine covered with a cover to protect it from dust. Dust, mixed with lubrication, turns into an abrasive paste, which quickly wears out the details of the mechanism.
When a Master's Challenge is Necessary
There are situations when self-repair is dangerous or impossible. If you hear the grinding of metal, smell the burning or see the gears slipping, stop working immediately.
Complex electronic breakdown, failure in computerized model software Brother or Pfaff They require professional diagnosis. Trying to disassemble the electronic block will deprive you of the guarantee.
If after replacing the needle, thread and cleaning the shuttle the problem persists - most likely, the synchronization of mechanisms is disturbed, which requires the intervention of a specialist.
Also, the master is needed if the spooler is broken or the shuttle shaft bent. These parts require precise calibration that cannot be done at home without a special tool.
Why does the machine only sew back?
This usually indicates that the reverse lever stuck in the lower position or broke the spring that returns it. The problem may also be in the downed settings of the electronic control unit.
Can machine oil be used for lubrication?
Absolutely not. Conventional engine oil is too thick, over time it dries up and turns into a resin, which will lead to a jamming mechanism. Use only special liquid oils for sewing machines.
What to do if the needle inside is broken?
Don't turn on the machine. Take off your foot and needle plate. Carefully remove the fragment with tweezers. Be sure to check the shuttle - shards of needles could get there and damage its surface.