When weaving 2+2 ribs on a rib machine, how to adjust if the front and back loops have the same effect?

The methods of debugging the fabric with the same effect of the front and back loops

When debugging fabrics with similar styles on both sides of the cloth, we should use the knitting method. The purpose of this is to complete the unlooping process of the dial needle and the cylinder needle at the same time to avoid the front and back loops caused by the transfer of loops. The tightness is inconsistent. The difference between it and the post-cutting knitting is: it solves the problem of inconsistency of the front and back fabric patterns; under the same thread length, the fabric knitted by the gating-cutting has a small width and good elasticity; the minimum thread length for the knitting is It is much longer than the smallest thread that can be woven after the bite.

Adjustment method when debugging other required 2+2 rib fabric

When knitting 2+2 ribs with higher gram quality, when all the knitting conditions and the matching positions of the parts are the same, the longer the thread, the higher the gram quality. But in this discussion, the dial cam matches the cylinder cam. The change of position belongs to the essential change of the knitting conditions, it is no longer suitable for the comparison of the relationship between the length of the thread and the quality of the gram under the same conditions. The actual situation also proves that under the condition of the same thread length, the width of the fabric woven by the side-by-side knitting is smaller and the gram quality is much higher. This is the result of the change in weaving conditions. When knitting in the back position, even if the minimum thread length is adjusted, the gram quality may not be higher than the gram quality of the fabric when the normal thread length is woven in the position position.

When weaving 2+2 ribs and spandex, the spandex feeding method of the machine should be adjusted and modified. The general rib and spandex method is to feed the spandex yarn into the dial needle from the outer side of the dial needle through a guide wheel, and adjust the relative position of the dial cam and the needle cylinder cam to the rear to prevent the needle from hooking the needle cylinder. Spandex yarn. This method is obviously not feasible when aligning the position. Using this method will cause the needle of the syringe to eat the spandex yarn. When knitting in the opposite position, if you want to add spandex to the needle of the dial, you can use another method, that is, the spandex yarn is fed from above the needle of the dial and behind the needle of the cylinder. In this way, it is possible to prevent the needle cylinder from eating the spandex yarn. However, the use of this method to add spandex yarn has certain requirements for the machine. The requirements are as follows: First, the selection of dial needles cannot use knitting needles with too long tongue lengths. The tongues of long latch needles are closed earlier when they are unlooped. , It is easy to clamp the spandex yarn to form a cut, and the spandex will break. Secondly, there are certain requirements for the design of the triangle curve of the dial, and the purpose is to control the closing time of the needle through the curve.

The post-eating bit does not necessarily solve the cloth problem. At present, the dial needles of most rib knitting machines on the market use small-end needles, that is, small hook and short latch knitting needles, the purpose of which is to reduce the amount of loop transfer during the unlooping process. Because the smaller the needle is, the less tight the old loop of the dial needle is when it is unlooped to the needle, and the less the amount of yarn that needs to be transferred from the old loop of the needle cylinder needle. However, the phenomenon of transfer is still unavoidable. It is just a change in the amount of transfer, and the solution to the cloth problem is only local, not a fundamental solution.

Another small number of machines have adopted another method to solve this problem. The idea is: Since the loop transfer is inevitable, let it happen. All that is to be done is to add another knitting action after the loop transfer is over to reverse the consequences of the loop transfer during the unlooping process. The method is: when the dial needle and the needle cylinder needle complete the looping and enter the next knitting action, let the dial needle perform a respiration layman’s action, and at the same time let the cylinder needle have a downward pressing and tightening action, so that the dial needle and the needle The cylinder needle performs another loop transfer to eliminate the unfair distribution of the loops caused by the transfer of the loops during the looping process of the dial needle and the cylinder needle.