Industrial sewing machine 1022 class is deservedly considered a “workhorse” in modern sewing enterprises specializing in sewing clothes from light and medium fabrics. This two-needle straight stitch machine provides high productivity and consistent stitch quality, which is critical for mass production. The design of the unit is designed taking into account continuous operation throughout the full operating cycle, however, even such a reliable mechanism requires competent maintenance.
Owners of this equipment must clearly understand that 1022 class is a complex mechanical system where the slightest deviation in the needle and shuttle synchronization settings can lead to product defects. Unlike household analogues, here the rotation speed of the main shaft reaches 5500 rpm, and the needle puncture force is much higher. That is why regular diagnostics and knowledge of the main components of the unit are mandatory skills for any operator or workshop mechanic.
In this article we will analyze in detail the technical features, operating principles and methods for eliminating common faults. You will learn how to properly adjust thread tension, replace worn parts and carry out preventive lubrication so that your sewing machine worked like clockwork for many years.
Technical characteristics and mechanism design
The basis of reliability sewing machine class 1022 is its massive cast body and reinforced main shaft, capable of withstanding high dynamic loads. The two-needle design allows you to lay two parallel lines at the same time, which significantly speeds up the process of stitching parts. The needle bar mechanism here is designed with an upper position, which ensures straight needle travel and minimizes vibration at high speeds.
The key element of the system is shuttle mechanism, working on the principle of double magnification. It ensures that the top and bottom threads are securely intertwined, creating a strong stitch. It is important to note that the gap between the nose of the shuttle and the needle should be minimal, but not cause friction, otherwise thread breaks or skipped stitches will occur.
Use only original or certified compatible needles marked DPx5, as other needle systems may interfere with the looper and damage the hook.
All rubbing components are lubricated automatically through an oil circulation system built into the base of the machine. The oil level is monitored through an inspection window, and the pressure in the system is regulated by a special screw. Violation of the lubrication regime is one of the main causes of premature wear plain bearings and bushings.
- 🧵 Machine type: two-needle, straight stitch, with automatic lubrication.
- ⚙️ Maximum speed: up to 5500 stitches per minute (depending on modification).
- 📏 Stitch length: adjustable from 0 to 9 mm.
- 🔌 Drive: electric straight line (EF) or servo motor.
Operating principle and thread tension setting
Stitch quality 1022 class directly depends on the correct balancing of the tension of the upper and lower threads. The upper thread passes through a complex system of thread tensioners, compensation spring and needle eye. The bobbin thread is formed in the bobbin case, which also has its own tension regulator. An ideal stitch is obtained when the knot of thread weave is strictly within the thickness of the materials being sewn.
If the knot is visible from above, it means that the lower thread is too tight or the upper thread is too loose. In the opposite situation, when the loops are visible from below, it is necessary to loosen the screw on the bobbin case or increase the tension of the upper thread using the nut on the thread taker. Tension adjustment should be carried out on test samples of the fabric with which work is planned.
Particular attention should be paid to the passage of the thread through the eye of the needle when moving the needle bar. If the thread gets stuck or jerks, the thread tension disc may be damaged or the thread guides may be dirty. Regular cleaning of these components from lint and dust is the key to stable operation. Remember that The main cause of thread breaks in 80% of cases is not the quality of the threads, but microtrauma on the needle or improper threading.
- 🔍 Check for any burrs on the needle holder and foot.
- 🧶 Make sure that the thread unwinds freely from the spool without jerking.
- 🛠️ Clean the thread tension discs from lint with compressed air.
Adjusting the feed rack and fabric advance
Uniform advancement of the fabric under the presser foot ensures rack. On the 1022 class machine, the height of the teeth and their inclination are adjustable for different types of materials. For thin fabrics, the rail should be lowered so as not to damage the structure of the fabric, and for thick denim or coat fabrics, it should be raised higher for a confident grip.
Synchronizing the movement of the staff with the lowering of the needle is a critical parameter. If the fabric is fed too early or too late, it will cause the needle to break or the stitch length to be distorted. Adjustment is made by turning the eccentric on the main shaft or shifting the rack drive rod. This can be checked visually by slowly rotating the handwheel and observing the moment the fabric begins to move relative to the position of the needle.
☑️ Checking the progress of the fabric
Often operators are faced with the problem of “seating” the fabric when the lower fabric is gathered into an accordion. This may indicate that the rack teeth are too aggressive or the presser foot is not pressing enough. In such cases, it is recommended to reduce the lifting height of the rack or replace the foot with a Teflon (anti-friction) one, which will facilitate the sliding of the material.
Replacing and installing needles: step-by-step instructions
Replacing needles with two-needle machine requires increased accuracy, since the slightest misalignment of one of them will lead to a collision with the shuttle. Only system needles should be used DPx5 (or 134R depending on the manufacturer). Installation is carried out until it stops in the needle holder, while the long groove on the needle should face the direction of threading (usually on the left when viewed from the front, but it is better to check the manual for the specific modification).
The replacement process is as follows: loosen the needle clamp screws, remove the old needles, insert new ones, pressing them firmly against the stop, and tighten the screws securely. After installation, be sure to check the height of the needle clamp. The point of the needle in the lower position must fall below the needle plate by a certain amount (usually 1.5–2 mm) so that the hook can correctly capture the loop of thread.
Replacement procedure:1. Raise the needle bar to the upper position.
2. Loosen the needle screws.
3. Insert new needles as far as they will go.
4. Tighten the screws firmly, but not fanatically.
5. Rotate the flywheel by hand to check clearances.
Why do needles break?
Needles most often break due to incorrect installation (not all the way), the use of dull needles, tugging the fabric too hard by hand when sewing, or collision with metal parts (buttons, zippers). The cause may also be a bent needle holder.
It is important to regularly inspect the needle point under a magnifying glass. A dull needle does not pierce the fabric, but pierces it, tearing the fibers, which leads to puffs and waste. At high speeds sewing machine 1022 class heats up the needle, so for synthetic fabrics it is recommended to use Teflon-coated needles or special cooled needles.
Eliminating skipped stitches and stitch defects
Stitch skipping is one of the most common problems that operators encounter. By car 1022 class this is often due to a lack of synchronization between the nose of the shuttle and the eye of the needle. At the moment when the needle begins to rise from the lower position, the nose of the shuttle should pass slightly above the eye (by 1.5–2 mm) and close to it (gap 0.05 mm). If the gap is larger, the loop does not form; if it is smaller, the needle becomes dull on the shuttle.
Skips can also occur due to the incorrect position of the thread pressure plate. It should press the thread tightly against the needle at the moment the loop is formed. If the plate is loose or deformed, the thread slips and the shuttle passes by. Adjustment of this unit requires fine adjustment of the screws on the thread clamp bar holder.
Precise synchronization of the hook and needle is 90% of success in eliminating skips. Do not try to solve the problem only by replacing the needle or thread if the geometry of the interaction of the nodes is broken.
Defects such as cross stitching or different stitch lengths often indicate problems with the feed mechanism or drive belt slippage. Check the belt tension and the condition of the gear drive. If the belt is stretched or cracked, it must be replaced, as it does not transmit rotation evenly, especially during a sharp start.
| Stitch defect | Possible reason | Elimination method |
|---|---|---|
| Skipped stitches | Incorrect hook gap, dull needle | Timing adjustment, needle replacement |
| Broken upper thread | Seizure on thread tension, needle overheating | Polishing the thread path, changing the needle/thread |
| Uneven stitch | Belt slipping, rack clogged | Replacing the belt, cleaning the rack |
| Knocking in the mechanism | Lack of oil, worn bushings | Lubrication, replacement of worn parts |
Maintenance and lubrication of components
Durability sewing machine class 1022 directly depends on the quality and regularity of lubrication. Unlike household models, it uses an automatic lubrication system with immersion in an oil bath and splashing. The oil level should always be between the "MIN" and "MAX" marks on the sight glass. Using the wrong oil (too viscous or insufficiently purified) will cause coking of the channels and jamming of the mechanism.
Every day before starting work, it is necessary to check the oil level and the cleanliness of the under-hook space. Lint, dust and fabric scraps mix with oil to form an abrasive paste, which quickly damages bearings and bushings. Once a week, it is recommended to thoroughly clean the internal components using a special cleaning agent and brushes.
When changing the fabric type (for example, from cotton to leather), be sure to wipe the needle plate and presser foot so that the previous lint does not get into the shuttle mechanism.
⚠️ Attention: Never start the car without checking the oil level! Dry running, even for a few seconds at high speeds, can cause irreversible overheating and shaft scuffing, requiring costly major repairs.
Scheduled maintenance should be carried out by a qualified mechanic at least once every six months during heavy use. During maintenance, the shaft play, the condition of the gears, the belt tension are checked and all adjusting units are calibrated. Timely replacement of oil seals will prevent oil leaks onto the fabric, which is a common defect in production.
How often do you need to change the oil in a 1022 class car?
A complete oil change is recommended every 6 months or after 2000 operating hours. However, if the oil has darkened, acquired a burning smell, or metal shavings are visible in it, it must be replaced immediately, after first flushing the system with special flushing oil.
Can I use household machine oil?
Strongly not recommended. Household oils have a different viscosity and additives; they quickly oxidize at high temperatures and speeds of industrial machines, forming a varnish coating that clogs thin lubrication channels.
What should I do if my car makes a loud noise?
A hum may indicate that the engine is running, the gears in the head are worn out, or there is a lack of lubrication. First check the oil level. If the oil is fine, listen to where the sound is coming from. A metal clanging noise requires immediate stopping and diagnosis by a mechanic.
Why does the machine sew well only at high speeds?
This is a typical sign of problems with the shuttle mechanism or thread tension. At low speeds there is not enough inertia to form the loop correctly if the clearances are compromised. It is necessary to check the synchronization of the hook and the needle.