Normal production of circular knitting machine and then start the shutdown will leave a mark on the fabric woven weft. Fabrics such as the traces category of such factors as the type of loom and, generally there will be a small concave marks, after stopping the loom woven fabric apparent boundaries; sometimes appear wider traces loom woven fabrics difference before and after the shutdown is not very obvious. After dyeing the fabric, there is downtime marks the location of the normal production of non-stop fabric to form a certain color, and if the shutdown occurs frequently marks the extent of more serious, it will affect the normal cutting fabric using a waste.
Causes Shutdown marks
The reason there are a lot of downtime marks: yarn sending mutations cause uneven yarn tension, thereby changing the shape and size of the coil form shutdown marks; relative swing Loom yarn between the drive gear and spindle drive gear positioning slot will operate , shaft locating pin the wear, severe wear gear axis will be larger, thereby affecting the yarn tension downtime marks; sending length adjustment plate and yarn storage drive belt between the relative sliding due to the incoming volume adjustment plate plastic yarn wear particles and the reservoir pressure yarn belt or between the belt and the rubber is insufficient, the shutdown, start operation of the loom during the sudden change in speed, resulting in the coefficient of friction between the belt and the particles becomes smaller, the formation of sliding, resulting in the unit laps yarn feeding volume changes, thereby affecting the formation of the yarn tension shutdown marks.
Gear tooth wear yarn storage or packing, storing yarn belt wear lint that loom in the shutdown, startup yarn accumulator conveyor belt sliding intensified, resulting in the reduction or increase the number of turns per unit to send the yarn form a shutdown marks. Wide marks down this case, is also caused by the change in length of the coil, the coil length will generally vary from 2% to 8%. Other yarn feeding system transmission belt is too loose, wear will also shut down, resulting in the formation of uneven tension shutdown marks startup.
Improve the way down marks
Overall, the main way to improve the marks have prolonged shutdown looms deceleration time, increase fabric tension, reduce rising rod chassis Triangulum virtual spaces, model selection.
The longer looms in the process of deceleration time, the rate of change of gear swing between the rate of change of the relative sliding of the belt will be smaller, so that the yarn tension will not change too rapidly, and thus reduce the degree of downtime marks. The longer the braking time, the loom continues to operate after a yarn break, the longer, the amount of yarn stored in the yarn storage limits, generally braking time set to 1.5 seconds to 1.8 seconds is appropriate to ensure the yarn breaks without causing rags .
Improvements can also be achieved by stopping marks the dummy bit to reduce rising Triangulum chassis rod. A reduction of between gears meshing gap between the gear and the shaft relative to the swing between the reduction in virtual spaces (leaf bed empty spaces) between coniferous and triangle. In order to ensure the normal operation of the loom, leaves the bed empty spaces can generally be controlled at around 0.1 mm.
At present, most models syringe triangular base with a central lifting devices, each rising point strut dummy bit large, triangular seat driving causing tension changes and even throwing needles rapid rotation. Appropriate to reduce the strut virtual spaces, both to ensure the proper use central lift Triangulum will not throw too serious on the market. When loom normal move forward, throwing on the market Triangulum amount is generally controlled within 0.03 mm.
Now most circular knitting machine market with wear-resistant steel sheet to replace the runway design. After the wire bead type of round runway wave machine normally 3 to 5 years due to the wave of beads and wire wear runway, looms in the acceleration and deceleration operation, thereby increasing the syringe serious drift down scar severity. Therefore, in the choice of producers to try to avoid election enough models such models should choose good precision, well-designed models.
