Bar Tack Sewing Machine | Study on Bar Tack Sewing Machine & Produce Sample

Name of the Experiment: Study on Bar tack sewing machine & produce sample.

There are many types of sewing machine. Some are used for special purposes such as bar-tack, button hole attaching machine, button hole making machine etc. This type of machines works in a cycle and so these are called simple automatic machine. Here we study on a type of machine that is bar tack machine. Bar tack means to increase strength of small length of fabric by sewing on it and then by repeating it. For example – belt loop, opening of pocket. It is a simple automatic machine which produces stitches in a cyclic order.

  1. To know about the machine parts.
  2. To know about the thread path.
  3. To know about the parts of bar tack machine.
  4. To know the working principle of this machine.
  5. To know the SPM, TPI, needle name, needle size of this machine.
Specification of Bar Tack Sewing Machine:
  • Brand : JUKI
  • Model : LK1850
  • Group : Lock stitch
  • Needle use : DPX5
  • Needle size : 9, 11, 14, 16, 18, 20 & 21
  • SPM : 3000-3600
  • TPH : 6-7 inch
  • Pressure : 64
  • Length : 1-1.5 cm
  • Made in : Japan.
  • TPI (Thread per inch) per pressure: 64 stitch.
Different Parts of Bar Tack Sewing Machine:
  1. Bobbin winding
  2. Bobbin winding spring tensioner
  3. Back stitch lever
  4. Spring tensioner post box
  5. Thread guide
  6. Knife lever
  7. Thread take-up lever
  8. Needle
  9. Knife
  10. Wiper
  11. Pressure feed guide
  12. Throat plate
  13. Bobbin
  14. Bobbin case
  15. Pressure lever
  16. Tensioner
Bar Tack Sewing Machine
A=Cone Package
J=Thread take up lever

In a few length of cloth sewing again and again after sewing one time to increase the power of bearing load of that place of cloth is called bar tack. A bar tack machine can sew strongly with in a few lengths cyclically. At first doing tak stitch (1-2 cm) then in opposite make cover stitch (zigzag) on tak stitch. A little change can be done between tack stitch and cover stitch.

Working Principle of
Bar Tack Sewing Machine:
At first this machine produces tack stitches in a small length (1-2 cm) and then sews covering stitches over and at right angles to the first stitches. The variables are the number of tacking stitches and the number of covering stitches. Typical uses are closing the ends of buttonholes, reinforcing the ends of pocket openings and the bottoms of flies and sewing on belt loops. The adjustment points of this machine are needle, pressure feed, stitch length, stitch density.

Uses of Bar Tack Sewing Machine:

  1. Attaching belt loops.
  2. Increasing strength in corner of pocket.
  3. Closing the two corners of button hole.
  4. At the end of zipper.
  5. In that place where more strength is needed to support extra load.
This type of machine can not be used for normal purpose. But for making a complete garment their importance can not be denied. Special care and sufficient knowledge is necessary for proper working. Otherwise faulty sewing may be done. I would like to give special thanks to our teacher. I am also grateful to our instructors. I think this will be very helpful in my future life. 

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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.

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