Spindles and their drive have a great influence on power
consumption and noise level in the machine
The running characteristics of a spindle, especially imbalance and eccentricity relative to the ring flange, also affect yarn quality and of course the number of end breakage. Almost all yarn parameters are affected by poorly running spindles. Hence it should be ensured that the centering of the spindles relative to the rings is as accurate as possible. Since the ring and spindle form independent units and are able to shift relative to each other in operation, these two parts must be re-centered from time to time. Previously, this was done by shifting the spindle relative to the ring, but now it is usually carried out by adjusting the ring.
The running characteristics of a spindle, especially imbalance and eccentricity relative to the ring flange, also affect yarn quality and of course the number of end breakage. Almost all yarn parameters are affected by poorly running spindles. Hence it should be ensured that the centering of the spindles relative to the rings is as accurate as possible. Since the ring and spindle form independent units and are able to shift relative to each other in operation, these two parts must be re-centered from time to time. Previously, this was done by shifting the spindle relative to the ring, but now it is usually carried out by adjusting the ring.
· · In
comparison with Tangential belt drive, the 4-spindle drive has the advantages
of lower noise level
and energy consumption, and tapes are easier to replace.
and energy consumption, and tapes are easier to replace.
· Lappet guide performs the same sequence of
movements as the ringrail, but with a shorter stroke, this movement of the
guide ensures that differences in the balloon height caused by changes in the
ring rail positions do not become too large. This helps to control the yarn
tension variation with in control, so that ends down rate and yarn charactersitics
are under control.
· · Spindles
used today are relatively long. The spacing between the ring and the thread
guide is correspondigly long, thus giving a high
balloon. This has two negative influence
- A high balloon results in large bobbin diameter leading to space problems
- Larger the balloon diameter , higher the air drag on the yarn.This inturn causes increased deformation of the balloon curve out of hte plane intersecting the spindle axis.This deformation can lead to balloon stability, there is increase danger of collapse.
- · Both these disadvantages result in
higher yarn tension, thereby higher endbreaks.In order to avoid this,
balloon control rings are used. It divides the balloon into two smaller sub-balloons. Inspite of its large overall height, the double-balloon created in this way is thoroughly stable even at relatively low yarn tension. - · · Balloon control rings therefore help to run the mahcine with long spindles(longer lift) and at high spindle speed, but with lower yarn tension. Since the yarn rubs against the control ring, it may cause roughening of the yarn.
· · · Most ends
down arise from breaks in the spinning triangle, because very high forces are
exerted on a strand consisting of fibres which have not yet been fully bound
together in the spinning triangle.