Round machine column │ knitting machine rounding marks generation and elimination

There are many reasons for the occurrence of downtime:

1. The sudden change of the yarn feeding amount causes the yarn tension to be uneven, thereby changing the shape and size of the coil to form a stop mark;

2. The relative swinging loom between the yarn feeding transmission gear and the main shaft will wear the transmission gear positioning groove and the transmission shaft positioning pin. In severe cases, the gear shaft will be abraded and become large, which will affect the yarn tension and cause the downslope;

3. Relative sliding between the yarn feeding amount adjusting plate and the yarn accumulator driving belt. The yarn feeding amount adjusts the wear of the rubber particles and the yarn storage belt in the disk, or the pressure between the driving belt and the rubber particles is insufficient, and the loom is stopped during starting and starting. The rapid change of the running speed causes the friction coefficient between the rubber particles and the conveyor belt to become smaller, forming a relative sliding, causing a change in the yarn feed amount per unit number of turns, thereby affecting the yarn tension to form a stop mark.
4. The wear of the storage gear of the yarn accumulator or the packing of the batt, the wear of the conveyor of the yarn accumulator, so that the relative sliding of the yarn accumulator and the conveyor belt is intensified during the stop and start-up process, resulting in a decrease in the amount of yarn fed per unit number of turns or Increase and form a stop mark.

In this case, the downtime is wide, which is also caused by the change of the length of the coil. The length of the coil generally varies by 2% to 8%. If the other relevant transmission belts in the yarn feeding system are too loose and wear, the tension will be uneven during the stop and start to form a stop mark.

In general, the methods to improve the stoppage are mainly to extend the deceleration time of the loom, increase the billet force, reduce the virtual position of the riser of the saddle chassis, and select the model.

The longer the weaving machine is in the process of deceleration, the smaller the rate of change of the oscillation between the gears and the relative sliding change rate of the belt, so that the tension of the yarn does not change too quickly, thereby reducing the degree of the backlog. The longer the braking time, the longer the looms continue to run after the yarn breakage. Due to the limitation of the yarn storage capacity of the yarn storage device, the general braking time is set to 1.5 seconds to 1.8 seconds, so as to ensure that the rag will not be caused after the yarn breakage. .

Improved backstops can also be achieved by reducing the imaginary position of the riser of the pedestal chassis. That is, the meshing gap between the gears and the shaft between the gears and the shaft is reduced, and the virtual position between the needles and the triangles is reduced (the leaf bed is imaginary). In order to ensure the normal operation of the loom, the leaf bed imaginary position can generally be controlled at about 0.1 mm.

At present, the triangular base of most models of the syringe adopts the central lifting device, and the rising point of each rising point is large, so that when the knitting needle rotates rapidly, the tension on the triangular seat is caused to change. Appropriate reduction of the yoke of the pole can ensure that the central lift can be used normally without throwing the triangle on the large plate. When the loom is moving normally, the throwing amount on the triangular seat is generally controlled within 0.03 mm.

Most of the circular knitting machines nowadays use wear-resistant sheets to replace the design of the steel track. After the normal use of the wire-track bead type circular machine for 3 to 5 years, due to the wear of the wave beads and the steel track, the looms are severely drifted during the acceleration and deceleration, thereby increasing the severity of the stop marks. Therefore, when selecting a model, the manufacturer should try to avoid selecting such a model. It should choose a model with good precision and perfect design.

The knitting circular machine is divided according to the type of fabrics it produces. There are two types of single-sided knitting circular knitting machines and double-sided knitting circular knitting machines. The single-face series knitting circular machine can be divided into ordinary single-face knitting circular machine, single-face terry machine, three-line weft knitting machine, jacquard single-face knitting circular machine and so on.