Lock Thread Stitching Machine Two Hook Line Breakage "Prevention"

If the shuttle hook hooks the face line every time, that is, once the needle punching material is used once, the hook hook is two times, then it will conflict with the face line's collection and release, resulting in the phenomenon that the stitch will be broken.

This is possible when sewing the uneven seam material.

The reason is discussed from the forming process of lock stitch.

The lock stitch is composed of a face line and a bottom line interwoven in the stitching material.

When sewing machine works, the needle guide line passes through the seam material and rises up after reaching the lower limit position.

Because there is friction between the stitching material and the suture, the surface line can not be lifted synchronously by random needle, but is stuck under the seam material. Under the action of elasticity, it will expand to the sides of the machine needle to form ring type.

Then, the spindle point of the shuttle can reach the needle at the point of movement, pass through the face line loop, and continue to rotate in the course of movement.

When it comes to its own radius, it jumps over the enlarged line like a rope skipping.

The downward movement is the take-up of the take-up rod and the feeding of the cloth teeth to allow the movements to be carried out smoothly enough. The shuttle is still rotating at the original speed for a week, but no longer hooks.

Due to the take-up effect of the take-up rod, the surface line ring which was originally enlarged and leaped by the spinning shuttle rapidly reduced until the bottom line drawn from the heart of the shuttle spindle was pulled into the sewing material to form a single interleaving.

When the needle reaches the upper limit position, the sewing machine starts again and again, and repeats the above action process again, so as to form a continuous and regular lock line stitch on the sewing material.

A key part of adjusting the sewing machine is to adjust the so-called hook line time. The usual adjustment standard is that when the needle drops to the lowest position, when the 2.2mm is lifted up, the spindle tip reaches the center line of the machine needle and 2mm from the upper edge of the needle hole.

Of course, this is not invariable, because the purpose of adjusting the hook time is to hook the surface line when the spindle tip is formed in a full and stable optimum line loop, thereby avoiding jumping.

Because of the thin thread used for sewing thin material, the stitch itself is soft, and the friction force between the sewing material and the sewing material is small. When the thick material is used, the thick thread must be used, the stitch itself is more rigid, and the friction force between the sewing material and the sewing material is large.

Therefore, there is a difference in the time of sewing thread forming the best wire ring when the thickness of the sewing material is different. This requires that the hook line be adjusted flexibly according to the specific conditions so as to achieve the desired sewing effect.

Experienced sewing workers and operators know that when the material is slit, the spindle must be "fast". When the material is thick, the spindle must be "slow". The reason is not difficult to understand.

When sewing thin material, the stitches are thin and soft, and the needle slightly rises from the bottom limit, and the sewing threads will expand to the sides of the machine needle to form a wire loop.

In addition, because the friction between sewing material and suture is small, when the needle continues to ascend, the randomness of the relative position between the stitching material and the suture is large. Besides, the stitch is fine and soft, the wire ring is easy to deflect, and it becomes difficult to maintain stability.

Therefore, a slight advance adjustment of the spindle tip relative to the movement of the needle is helpful to enhance the reliability of the hook line.

On the contrary, when the thick material is slit, the sewing material is thick and firm, and the machine needle can form a full line ring when the lower limit position is raised higher.

The friction between the sewing material and the suture is large, and the stitching material is thick and hard. Even if the needle is raised, the sewing thread will be more and the wire ring will not be deflected.

Therefore, it is more beneficial to prevent jumping needle when the movement of the spindle tip is relative to the movement of the needle.

Types and functions of the revolving moon circle

When sewing time is adjusted according to sewing requirements, the time when the stitch runs around the shuttle spindle from the spinning spindle is also determined.

When the thick material is slit, the point of the shuttle spindle is adjusted later than that of the machine needle. The time when the thread loop is released from the spinning spindle is adjusted after the machine needle is delayed. The time of the thread loop from the spin spindle is also late. In addition, when the thick material is needed, the line is the largest and the remaining line is less.

However, when the material is slit, the point of the shuttle is adjusted ahead of the needle, and the time that the thread loop is released from the spin is often earlier than the time when the spindle tip reaches the center line of the machine needle.

In addition, when the slit is thin, the consumption line is less and the remaining lines are more. It is easy to happen that the spindle tip hooks again from the spin shuttle in the idling, and there is an abnormal two hook line.

When the hook is in normal hook line, the take-up rod is at the beginning of the laying off stage. After the thread loop is lifted out of the rotary shuttle, the take-up rod begins to rapidly take up the thread.

If there is a two hook line, it will inevitably conflict with the take-up line of the take-up rod, which will definitely lead to disconnection.

In order to avoid the two hook line, effective measures were taken in the design of the shuttle structure.

By comparing the rotating shuttles of slit thick and slit sewing machines, it is found that the structure of the moon circle is obviously different from the vertical level shuttle, the horizontal level shuttle or the vertical shuttle.

The circular circle of the sewing machine rotary shuttle only forms the shuttle gallbladder through the slot, and the tail ends are short flat.

In this way, the thick thread will be removed from the spinning spindle earlier, and the take-up action of the take-up rod will be dragged into the sewing material as soon as possible.

The moon circle of the slit sewing machine is not the same. The tail ends of the sewing machine are serpent tail, and the length is longer and the contraction is gradual.

The moon circle of the slit sewing machine's rotating shuttle not only has the function of forming the shuttle gallbladder through the slot, but also has the responsibility of guiding off line at the end.

Notice that we can see that the surface line loop of the slit material is first turned to the tail of the moon circle when it is released from the spin shuttle, and then slips out from the tapered tail when the spinning shuttle continues to rotate.

Because the angular position of the tip of the moon's tail is later than that of the shuttle, the line loop from the end of the moon's circle will not be caught by the spindle at any rate.

Thus, the two hook line is reliably avoided.

If no matter how to adjust, the surface line is always not good, and the reverse side of the seam appears floating line, then check whether the moon circle is not suitable.