SOLUTIONS OF PROBLEMS EXISTING SEWING TECHNOLOGY USING NEW «ZARIF» DOUBLE THREAD CHAIN STITCH TECHNOLOGY

PROBLEM

Existing double thread chain stitch technologies.

1. Not dense join of materials with the help double thread chain stitch.

2. When sewing can be a skipped stitch, which is unacceptable for chain seams, as they are easy unravel with places of stitch skip.

3. When sewing may occur breakage of the threads.

4. It is required to adjust the thread tension when sewing different materials.

5. It is impossible to reduce the length of double thread chain stitch to 0,5 mm, to improve the reliability of backtack the end of a chain seam from unraveling.

6. Impossible interlacing of threads when the stitch length is equal 0 mm.

7. For sewing thick materials required to choose a sewing machine with a long stroke of the needle bar.

8. The needle at movement downwards may encounter with the looper, which reduces the service life of the needle and looper.

9. At the transition from needle Nm.130/21 to needle Nm.60/8 it is required to adjust the looper relative to the needle, since the maximum clearance gap between the nose of the looper and needle is equal 0,15 mm.

10. To improve the reliability of stitch formation are used left and right guards of a needle.

11. For the transition from the normal chain seam to the elastic chain seam is required to adjust the thread guides.

12. The needle is less strong in bending, as it has two long grooves.

13. It is impossible to get special non-raveling chain seam.

14. Sewing machines have complex mechanical design.

PROBLEM

Lockstitch technologies.

1. Frequent changes of the bottom thread from the bobbin hook, which reduces productivity.

2. In the sewing process can be a skipped stitch.

3. In the sewing process can be occur breakage of the threads.

4. If change the thickness and hardness of the material being sewn, required to adjust the tension on the threads.

5. For sewing thick materials required to choose a sewing machine with a long stroke of the needle bar.

6. At the transition from needle Nm.130/21 to needle Nm.60/8 it is required to adjust the hook relative to the needle, since the maximum clearance gap between the nose of the hook and needle is equal 0,15 mm.

7. To improve the reliability of stitch formation are used left and right guards of a needle.

8. All hooks (shuttles) have a very complicated construction and relatively high cost.

9. Often need to clean the mud from under the needle plate.

10. Relatively not a strong join between of materials on rupture using a lockstitch, as through the loop of the top thread passes one branch of the bottom thread.

11. Relatively less elastic seam on stretchy materials using a lockstitch, as the lockstitch very small reserve threads.

12. It is necessary to lubricate the hook and not lubricated hooks (oil-free hooks) limit the sewing speed up to 4000 stitches per minute.

13. With the increase in the speed of sewing and the size of the hook increases the loss of mechanical strength of the top thread, due to the large number of repeated movements of the top thread through the material and the needle eye.

14. Uneven tightening of the top thread during the stitch formation with the help of take-up.

SOLUTION

New «ZARIF» double thread chain stitch technology.

1. Dense and very dense join of materials with the help double thread chain stitch.

2. Sewing without skip stitch with a 100% guarantee.

3. Sewing without breakage of the thread when using sewing threads having no knots and thick places.

4. Sewing different materials without adjustment of a tension of threads, with a normal tension of threads.

5. Reduce the stitch length to 0,5 mm, for reliable tacking end of a chain seam with the help stitch condensation.

6. Can be interlacing of threads up to five stitches at a stitch length is equal 0 mm.

7. One model of sewing machine with a needle bar stroke of 32 mm for sewing of all materials up to a thickness of 8 mm.

8. The needle at movement downwards does not encounter with the looper, which increases the service life of the needle and looper.

9. At the transition from needle Nm.130/21 to needle Nm.60/8 not adjust the looper relative to the needle, since the maximum clearance gap between the nose of the looper and needle is equal 0,5 mm.

10. High reliability of stitch formation is achieved by means of know-how, without the use of the left and right gauges of needle.

11. Easy transition from normal chain seam to elastic chain seam with the help of know-how.

12. The needle is very strong in bending, as it has one long groove.

13. Obtaining specials new non-raveling, high breaking strength and highly elastic chain seams.

14. Sewing machines have very simple mechanical design.

SOLUTION

New «ZARIF» double thread chain stitch technology.

1. No frequent changes of the bottom thread, which increases productivity.

2. Sewing without skip stitch with a 100% guarantee.

3. Sewing without breakage of the thread when using sewing threads having no knots and thick places.

4. Sewing materials of different thickness and hardness without adjustment of a tension of threads, with a normal tension of threads.

5. One model of sewing machine with a needle bar stroke of 32 mm for sewing of all materials up to a thickness of 8 mm.

6. At the transition from needle Nm.130/21 to needle Nm.60/8 not adjust the looper relative to the needle, since the maximum clearance gap between the nose of the looper and needle is equal 0,5 mm.

7. High reliability of stitch formation is achieved by means of know-how, without the use of the left and right gauges of needle.

8. The looper has a very simple design and low cost.

9. Can sewing longer without cleaning the mud from under the needle plate, since the rotating looper creates a strong air flow that throws mud away from the stitch formation zone.

10. Relatively very a strong join between of materials using double thread chain stitch, as through the loop of the top thread passes two branches of the bottom thread.

11. Can sew elastic chain seam, to increase the elasticity of the seam on the elastic materials.

12. Rotating the looper does not require lubrication, as it consists of one part and is rigidly secured on the shaft end.

13. With the increase in the speed of sewing top thread less loses mechanical strength, because of fewer repeated movements of the top thread through the material and the needle eye.

14. Uniform and smooth tightening of threads when forming the stitch with the help of rotating take-ups.