FAQ

Debugging of Single Circular Knitting Machine

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Triangle of sinker adjustment

  1. The concave position of sinker should be vertical to raising needle. A 0.5mm gas exits between concave position and needle.
  2. Dial-gauge is absorbed inside syringe. Gauge outfit points to the highest point of sinker.
  3. Loosen screw on triangle. Push the screw forward or backward which drive triangle forward or backward indirectly. Use dial-gauge to inspect the position of triangle. Then lock the screw.
  4. Make syringe rotate. Inspect the position of every triangle.

Sequence of triangle adjustment

  1. The sequence of triangle needs to be adjusted when changing yarn or knitting structure.
  2. Loosen all of the feet on upper case and connecting screws (six grains in total).
  3. Adjust upper case along with the rotating direction of machine, called as decelerating sequence adjustment. Conversely, it is called growing sequence adjustment.
  4. Adjust two adjusting screws on the feet of upper case.
  5. Lock connecting screws.
  6. Eccentric positioning wheel cannot be loosened during operation.

Triangle of needles adjustment

  1. Uniform tension improves the quality of textile. Resetting the position of needles can acquire uniform tension.
  2. Use tensioner to measure tension on every yarn.
  3. Use hexagon spanner to turn calibrator on triangle
  4. Inspect and adjust the tension on every yarn.

Gram weight adjustment

  1. Use hexagon spanner to turn adjusting gear inside indicating ring so that triangle can rise or fall with lifting ring to adjust density of textile.

Structure of Circular Weft Knitting Machine

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Structure of circular weft knitting machine consists of frame, yarn mechanism, transmission gear, lubricating eliminating mechanism, electric control system, spooler and other accessories.

Frame
Frame of circular weft knitting machine consists of three feet and a round (or square) table. Three feet are fixed by gin. There three crutches on the table. Crutches have yarn holder. A safe door exits in the gap between three feet for steady and safety.

Characteristics:
Feet adopt build-in structure
All of electrical wiring and instruments are put inside the feet
Safe door is reliable
When safe door is opened, machine will stop operating automatically. Warning is also shown on operation panel in case of accident.

Yarn mechanism
Yarn mechanism contains yarn holder, storage device, feeding nozzle, feeding wheel, coil bracket, etc.
Yarn holder
Yarn holder is used to lay yarn. It is classified into umbrella yarn holder and landing yarn hold. Umbrella has small cover. But it cannot connect to spare yarn. It is suitable for limited space. Landing yarn holder has triangle yarn holder and wall yarn holder. Triangle yarn holder is convenient for utilizing. Wall yarn holder can be arranged beautifully. But it has large cover.

Storage device
Storage device is used to store yarn.

Feeding nozzle
Feeding nozzle is used to transmit yarn to needle directly. It has different shapes, including single feeding nozzle and double feeding nozzle.

Feeding wheel
Feeding wheel is used to regulate the number of yarn.

Requirements for yarn mechanism
Yarn mechanism should guarantee uniformity and continuity of tension in yarn. Ensure uniformity for the sizes and shape of coil in textile so that can produce beautiful textile.
Yarn mechanism should ensure reasonable tension in case of defects on the surface of textile.
Hook should be smooth without burrs in case of yarn broken.

Knitting mechanism
Knitting mechanism is the core of circular weft knitting machine, consisting of syringe, needle, triangle, triangulum, sinker (only exiting in single circular knitting machine), etc.

Syringe
Syringe is used to put needle.

2. Triangle
Triangle is used to control reciprocating motion of needles and sinker inside syringe

Sinker
Sinker only exists in single circular knitting machine, cooperating with needles.

Needle
Needle is discriminated based on the height of bell. Needle makes tarn into textile.

Triangulum
Triangulum is utilized to put triangle

Requirements for knitting mechanism
Needle track should be smooth without burrs
Knob used to regulate pressing depth on triangulum should be flexible enough.
Ensure the height of withdrawing and the depth of pressing to meet the requirements of techniques.

Spooler
Spooler is used to drag textile from knitting and wind textile in roll form. Spooler consists of spreading frame, transmission arm, regulate gear box.

Transmission mechanism
Transmission mechanism is continuously variable transmitting motor controlled by frequency transformer. The motor uses cone belt or synchronous belt to drive gears on capstan shaft. It drives syringe to knit.

Lubricating eliminating mechanism
Large numbers of flyings and dust may cause occlusion or damage to machine during knitting. Lubricating eliminating mechanism is used to eliminate dust and dredge oil way.

Electrical control system
Control panel of electrical control system is made up with microcomputer and highly integrated control circuit.
Frequency transformer is key components of motor. It can control output frequency to change the rotation rate of motor.

Accessories
When needle is broken, prober will send signal to control system. Then machine will stop after 0.5 seconds.

What is Circular Knitting Machine?

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Circular knitting machine also called as circular weft knitting machine is widely utilized in textile industry. Circular knitting machine develops at a high speed for its advantages of many circle numbers, high rotation rate, high quantity, high quality, less procedures. In general, circular knitting machine can be classified into single side circular knitting machine and double side circular knitting.

Single side circular knitting machine has a syringe.

general single side circular knitting machine
General single side circular knitting machine has many circle numbers, high rotation rate and high quantity. General single side circular knitting machine has single needle track, double needle track, triple needle track, four needle tracks and six needle tracks. Single side circular knitting machine having four needle tracks is mostly used in textile industry.

single side terry machine
Single side terry machine, also called as single side sinker pile machine, has single needle track, double needle track and four needle tracks. Single side terry machine are classified into positive bag terry machine (yarn is covered by terry yarn) and negative bag terry machine (yarn is in the opposite of textile).

Three thread weft knitting machine
Three thread weft knitting machine also called as knitting machine or velvet machine, has single needle track, double needle track and four needle tracks. Three thread weft knitting machine is used to produce galling flannelette or non galling flannelette.

Jacquard single side circular knitting machine
Jacquard single side circular knitting machine is classified into small jacquard and large jacquard.

Small jacquard
Small jacquard is called as mechanical jacquard. It is convenient while having low ration rate and quantity. Small jacquard is used to knit small jacquard fabric.

Large jacquard
Large jacquard has a computer. The computer fetches the program inside floppy disk which has been inserted to computer. Then large jacquard can knit based on the program. Large jacquard is used to knit large knitted fabric and it can also change the colors of yarn.

Large jacquard reduces design cycle of products significantly, saving coast and highly improving quality.

1.Double side circular knitting machine
Double side circular knitting machine has two vertical syringes.
Ribber
Ribber is special types. It has (1+1) needle track, (2+2) needle track and (4+4) needle track. It knit new type fabric by using permutations of triangle and knitting needle and combination of yarn.

2. General double side circular knitting machine
General double side circular knitting machine also called as interlock machine, is a kind of multi function machine. Just like as ribber, general double side circular knitting machine also has (1+1) needle track, (2+2) needle track, (2+4) needle track and (4+4) needle track. Circular knitting machine with (2+4) needle track is the most commonly used.

3. Jacquard double side circular knitting machine
Jacquard double side circular knitting machine can also be classified into small jacquard and large jacquard.

Types of Damaged Needle

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Needle is one of key components in knitting machine, having closed relationships with quality of products. During operation, resistance and abrasion damage needle, forming defects on surface of cloth. Damaged needles must be replaced immediately.

Before replacing, recognizing type of damaged needle is the first. Find out damaged according to the reasons causing defects.
Loose pin needle: Larch pin of loose pin needle loosens, causing floricome.
Open needle: Open needle is also called as stiff tongue needle. Oil contamination exists in track. Needle latch cannot be closed
Torque needle: Needle latch or the tip of the tongue is broken.
Punch needle: Needle head lifts up upward slightly.
Excelsior needle: Needle head bend downward.
Broken needle: Needle latch, pin hook, needle bell is broken.
Damaged hook: Hook on needle head is drawn back. Needle latch cannot be closed.

Circular Knitting Machine Maintenance FAQ

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For its high price, circular knitting machine needs maintenance during daily operation to ensure its service life and improve quality.

For new circular knitting machine, the following aspects should be examined:
Examine the whole machine based on related technical documents provided by manufacturers. Check the machine whether is completed or not, including creel, yarn storage device, automatic stop arrangement, gear protective cover, polyurethane preparation, testing instruments, electrical appliances, etc.
Check accessories based on contract and attachment paper, including triangle, sinker, needle and other accessories.
Testing Run. Circular knitting machine needs to operate for at least one day after being installed and debugged. Check the style of cloth surface. During operation, check the triangle vibrating or not, yarn breakage and prober being flexible or not.

Working environment
Circular knitting machine may produce many flyings during knitting. For that, good ventilation should be kept in workshop. In winter, workshop has low temperature. Circular knitting machine has resistance. In summer, high temperature has great influence on frequency converter. So the temperature and relative humidity should be controlled between 28-30℃ and 65-75%. 28-30℃ is the best working temperature for circular knitting machine. When relative humidity is low, yarn may harden, causing stitch leakage on surface of fabrics and damaging needle. When relative humidity is high, needle and other accessories may rust.
Daily maintenance
Cotton fluff on creel must be eliminated and keep cleaning on machine no matter in day shift, middle shift or night shift.
Check yarn storage device in case of occlusion caused by cotton during succession.
Check automatic stop arrangement and gear protective cover frequently. Repair or replace it immediately when it is abnormal
Check grail and oil way is unblocked or not during succession or patrol inspection.

Weekly maintenance
Clean speed disk and eliminate the cottons storing up inside disc.
Inspect tension of belt on actuator and transmission.
Inspect operation of tractive and spooler.

Monthly maintenance
Remove triangle and clean the cottons on track or inside needle tray.
Inspect the wind direction of dust extraction fan and clean the dust on fan.
Clean cottons on all of accessories. Inspect the characteristics of accessories including automatic stop arrangement and safety inspection system.

Half a year maintenance
Clean the needle and sinker thoroughly. Inspect needle and sinker. Replace if it is damaged.
Check the oil way. Clean fueling injection device.
Clean and inspect transmitting yarn device.
Clean and inspect electrical system.

The Difference between Circular Weft Knitting Machine and Circular Weaving Machine

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Circular weft knitting machine is completed different from circular weaving machine. Circular weft knitting machine is knitting machine. Circular weaving machine belongs to weaving machine. Electronic patterning circular weft knitting machine is patterning with the guidance of computer. Yarns are knitted to cloth broadwise. So it is also called as weft knitting machine. The cloth is knitted into cylinder shape. For that, afterfinish needs slit. The cloth can be single slit or double slit.

Four shuttles circular weaving machine means circular weaving machine containing four shuttles. The motion of picking is different from rectilinear motion in wearing machine. The picking of circular weaving machine moves in a circle, passing through warp and making the warp to cloth. Circular weaving machine has various categories and simple structure. However, the more shuttles is, the more complicated structure is.

Both circular weft knitting machine and circular weaving machine knit all kinds of fabrics except for some special yarns, such as thick twine.

Circular weft knitting machine is mainly used to knit fashion fabrics or decorative fabrics. Circular weaving machine is used to knit industrial fabrics, such as cummerbund and mesh bags.